1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000-2009 Josh Coalson
3 * Copyright (C) 2011-2022 Xiph.Org Foundation
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * - Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * - Neither the name of the Xiph.org Foundation nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #ifdef HAVE_CONFIG_H
34 # include <config.h>
35 #endif
36
37 #include <stdio.h>
38 #include <stdlib.h> /* for malloc() */
39 #include <string.h> /* for memset/memcpy() */
40 #include <sys/types.h> /* for off_t */
41 #include <sys/stat.h> /* for stat() */
42 #include "share/compat.h"
43 #include "FLAC/assert.h"
44 #include "share/alloc.h"
45 #include "protected/stream_decoder.h"
46 #include "private/bitreader.h"
47 #include "private/bitmath.h"
48 #include "private/crc.h"
49 #include "private/fixed.h"
50 #include "private/format.h"
51 #include "private/lpc.h"
52 #include "private/md5.h"
53 #include "private/memory.h"
54 #include "private/macros.h"
55
56
57 /* technically this should be in an "export.c" but this is convenient enough */
58 FLAC_API int FLAC_API_SUPPORTS_OGG_FLAC = FLAC__HAS_OGG;
59
60
61 /***********************************************************************
62 *
63 * Private static data
64 *
65 ***********************************************************************/
66
67 static const FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
68
69 /***********************************************************************
70 *
71 * Private class method prototypes
72 *
73 ***********************************************************************/
74
75 static void set_defaults_(FLAC__StreamDecoder *decoder);
76 static FILE *get_binary_stdin_(void);
77 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels, uint32_t bps);
78 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
79 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
80 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
81 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length);
82 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length);
83 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length);
84 static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
85 static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj);
86 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
87 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
88 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode);
89 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
90 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
91 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
92 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode);
93 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode);
94 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
95 static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended);
96 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
97 static void undo_channel_coding(FLAC__StreamDecoder *decoder);
98 static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data);
99 #if FLAC__HAS_OGG
100 static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes);
101 static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
102 #endif
103 static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
104 static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status);
105 static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
106 #if FLAC__HAS_OGG
107 static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
108 #endif
109 static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
110 static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
111 static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
112 static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
113 static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data);
114
115 /***********************************************************************
116 *
117 * Private class data
118 *
119 ***********************************************************************/
120
121 typedef struct FLAC__StreamDecoderPrivate {
122 FLAC__bool is_ogg;
123 FLAC__StreamDecoderReadCallback read_callback;
124 FLAC__StreamDecoderSeekCallback seek_callback;
125 FLAC__StreamDecoderTellCallback tell_callback;
126 FLAC__StreamDecoderLengthCallback length_callback;
127 FLAC__StreamDecoderEofCallback eof_callback;
128 FLAC__StreamDecoderWriteCallback write_callback;
129 FLAC__StreamDecoderMetadataCallback metadata_callback;
130 FLAC__StreamDecoderErrorCallback error_callback;
131 void *client_data;
132 FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */
133 FLAC__BitReader *input;
134 FLAC__int32 *output[FLAC__MAX_CHANNELS];
135 FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */
136 FLAC__int64 *side_subframe;
137 FLAC__bool side_subframe_in_use;
138 FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
139 uint32_t output_capacity, output_channels;
140 FLAC__uint32 fixed_block_size, next_fixed_block_size;
141 FLAC__uint64 samples_decoded;
142 FLAC__bool has_stream_info, has_seek_table;
143 FLAC__StreamMetadata stream_info;
144 FLAC__StreamMetadata seek_table;
145 FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */
146 FLAC__byte *metadata_filter_ids;
147 size_t metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
148 FLAC__Frame frame;
149 FLAC__bool cached; /* true if there is a byte in lookahead */
150 FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
151 FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
152 /* unaligned (original) pointers to allocated data */
153 FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS];
154 FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek or if the metadata has a zero MD5 */
155 FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */
156 FLAC__bool is_seeking;
157 FLAC__MD5Context md5context;
158 FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */
159 /* (the rest of these are only used for seeking) */
160 FLAC__Frame last_frame; /* holds the info of the last frame we decoded or seeked to */
161 FLAC__bool last_frame_is_set;
162 FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */
163 FLAC__uint64 last_seen_framesync; /* if tell callback works, the location of the last seen frame sync code, to rewind to if needed */
164 FLAC__uint64 target_sample;
165 uint32_t unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */
166 FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */
167 } FLAC__StreamDecoderPrivate;
168
169 /***********************************************************************
170 *
171 * Public static class data
172 *
173 ***********************************************************************/
174
175 FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
176 "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
177 "FLAC__STREAM_DECODER_READ_METADATA",
178 "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
179 "FLAC__STREAM_DECODER_READ_FRAME",
180 "FLAC__STREAM_DECODER_END_OF_STREAM",
181 "FLAC__STREAM_DECODER_OGG_ERROR",
182 "FLAC__STREAM_DECODER_SEEK_ERROR",
183 "FLAC__STREAM_DECODER_ABORTED",
184 "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
185 "FLAC__STREAM_DECODER_UNINITIALIZED"
186 };
187
188 FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = {
189 "FLAC__STREAM_DECODER_INIT_STATUS_OK",
190 "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER",
191 "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS",
192 "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR",
193 "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE",
194 "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED"
195 };
196
197 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
198 "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
199 "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
200 "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
201 };
202
203 FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = {
204 "FLAC__STREAM_DECODER_SEEK_STATUS_OK",
205 "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR",
206 "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED"
207 };
208
209 FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = {
210 "FLAC__STREAM_DECODER_TELL_STATUS_OK",
211 "FLAC__STREAM_DECODER_TELL_STATUS_ERROR",
212 "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED"
213 };
214
215 FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = {
216 "FLAC__STREAM_DECODER_LENGTH_STATUS_OK",
217 "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR",
218 "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED"
219 };
220
221 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
222 "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
223 "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
224 };
225
226 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
227 "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
228 "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
229 "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH",
230 "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM",
231 "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_METADATA"
232 };
233
234 /***********************************************************************
235 *
236 * Class constructor/destructor
237 *
238 ***********************************************************************/
FLAC__stream_decoder_new(void)239 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void)
240 {
241 FLAC__StreamDecoder *decoder;
242 uint32_t i;
243
244 FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
245
246 decoder = calloc(1, sizeof(FLAC__StreamDecoder));
247 if(decoder == 0) {
248 return 0;
249 }
250
251 decoder->protected_ = calloc(1, sizeof(FLAC__StreamDecoderProtected));
252 if(decoder->protected_ == 0) {
253 free(decoder);
254 return 0;
255 }
256
257 decoder->private_ = calloc(1, sizeof(FLAC__StreamDecoderPrivate));
258 if(decoder->private_ == 0) {
259 free(decoder->protected_);
260 free(decoder);
261 return 0;
262 }
263
264 decoder->private_->input = FLAC__bitreader_new();
265 if(decoder->private_->input == 0) {
266 free(decoder->private_);
267 free(decoder->protected_);
268 free(decoder);
269 return 0;
270 }
271
272 decoder->private_->metadata_filter_ids_capacity = 16;
273 if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
274 FLAC__bitreader_delete(decoder->private_->input);
275 free(decoder->private_);
276 free(decoder->protected_);
277 free(decoder);
278 return 0;
279 }
280
281 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
282 decoder->private_->output[i] = 0;
283 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
284 }
285
286 decoder->private_->side_subframe = 0;
287
288 decoder->private_->output_capacity = 0;
289 decoder->private_->output_channels = 0;
290 decoder->private_->has_seek_table = false;
291
292 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
293 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
294
295 decoder->private_->file = 0;
296
297 set_defaults_(decoder);
298
299 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
300
301 return decoder;
302 }
303
FLAC__stream_decoder_delete(FLAC__StreamDecoder * decoder)304 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
305 {
306 uint32_t i;
307
308 if (decoder == NULL)
309 return ;
310
311 FLAC__ASSERT(0 != decoder->protected_);
312 FLAC__ASSERT(0 != decoder->private_);
313 FLAC__ASSERT(0 != decoder->private_->input);
314
315 (void)FLAC__stream_decoder_finish(decoder);
316
317 if(0 != decoder->private_->metadata_filter_ids)
318 free(decoder->private_->metadata_filter_ids);
319
320 FLAC__bitreader_delete(decoder->private_->input);
321
322 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
323 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
324
325 free(decoder->private_);
326 free(decoder->protected_);
327 free(decoder);
328 }
329
330 /***********************************************************************
331 *
332 * Public class methods
333 *
334 ***********************************************************************/
335
init_stream_internal_(FLAC__StreamDecoder * decoder,FLAC__StreamDecoderReadCallback read_callback,FLAC__StreamDecoderSeekCallback seek_callback,FLAC__StreamDecoderTellCallback tell_callback,FLAC__StreamDecoderLengthCallback length_callback,FLAC__StreamDecoderEofCallback eof_callback,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data,FLAC__bool is_ogg)336 static FLAC__StreamDecoderInitStatus init_stream_internal_(
337 FLAC__StreamDecoder *decoder,
338 FLAC__StreamDecoderReadCallback read_callback,
339 FLAC__StreamDecoderSeekCallback seek_callback,
340 FLAC__StreamDecoderTellCallback tell_callback,
341 FLAC__StreamDecoderLengthCallback length_callback,
342 FLAC__StreamDecoderEofCallback eof_callback,
343 FLAC__StreamDecoderWriteCallback write_callback,
344 FLAC__StreamDecoderMetadataCallback metadata_callback,
345 FLAC__StreamDecoderErrorCallback error_callback,
346 void *client_data,
347 FLAC__bool is_ogg
348 )
349 {
350 FLAC__ASSERT(0 != decoder);
351
352 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
353 return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
354
355 if(FLAC__HAS_OGG == 0 && is_ogg)
356 return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER;
357
358 if(
359 0 == read_callback ||
360 0 == write_callback ||
361 0 == error_callback ||
362 (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback))
363 )
364 return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
365
366 #if FLAC__HAS_OGG
367 decoder->private_->is_ogg = is_ogg;
368 if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect))
369 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
370 #endif
371
372 /* from here on, errors are fatal */
373
374 if(!FLAC__bitreader_init(decoder->private_->input, read_callback_, decoder)) {
375 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
376 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
377 }
378
379 decoder->private_->read_callback = read_callback;
380 decoder->private_->seek_callback = seek_callback;
381 decoder->private_->tell_callback = tell_callback;
382 decoder->private_->length_callback = length_callback;
383 decoder->private_->eof_callback = eof_callback;
384 decoder->private_->write_callback = write_callback;
385 decoder->private_->metadata_callback = metadata_callback;
386 decoder->private_->error_callback = error_callback;
387 decoder->private_->client_data = client_data;
388 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
389 decoder->private_->samples_decoded = 0;
390 decoder->private_->has_stream_info = false;
391 decoder->private_->cached = false;
392
393 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
394 decoder->private_->is_seeking = false;
395
396 decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */
397 if(!FLAC__stream_decoder_reset(decoder)) {
398 /* above call sets the state for us */
399 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
400 }
401
402 return FLAC__STREAM_DECODER_INIT_STATUS_OK;
403 }
404
FLAC__stream_decoder_init_stream(FLAC__StreamDecoder * decoder,FLAC__StreamDecoderReadCallback read_callback,FLAC__StreamDecoderSeekCallback seek_callback,FLAC__StreamDecoderTellCallback tell_callback,FLAC__StreamDecoderLengthCallback length_callback,FLAC__StreamDecoderEofCallback eof_callback,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)405 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream(
406 FLAC__StreamDecoder *decoder,
407 FLAC__StreamDecoderReadCallback read_callback,
408 FLAC__StreamDecoderSeekCallback seek_callback,
409 FLAC__StreamDecoderTellCallback tell_callback,
410 FLAC__StreamDecoderLengthCallback length_callback,
411 FLAC__StreamDecoderEofCallback eof_callback,
412 FLAC__StreamDecoderWriteCallback write_callback,
413 FLAC__StreamDecoderMetadataCallback metadata_callback,
414 FLAC__StreamDecoderErrorCallback error_callback,
415 void *client_data
416 )
417 {
418 return init_stream_internal_(
419 decoder,
420 read_callback,
421 seek_callback,
422 tell_callback,
423 length_callback,
424 eof_callback,
425 write_callback,
426 metadata_callback,
427 error_callback,
428 client_data,
429 /*is_ogg=*/false
430 );
431 }
432
FLAC__stream_decoder_init_ogg_stream(FLAC__StreamDecoder * decoder,FLAC__StreamDecoderReadCallback read_callback,FLAC__StreamDecoderSeekCallback seek_callback,FLAC__StreamDecoderTellCallback tell_callback,FLAC__StreamDecoderLengthCallback length_callback,FLAC__StreamDecoderEofCallback eof_callback,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)433 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream(
434 FLAC__StreamDecoder *decoder,
435 FLAC__StreamDecoderReadCallback read_callback,
436 FLAC__StreamDecoderSeekCallback seek_callback,
437 FLAC__StreamDecoderTellCallback tell_callback,
438 FLAC__StreamDecoderLengthCallback length_callback,
439 FLAC__StreamDecoderEofCallback eof_callback,
440 FLAC__StreamDecoderWriteCallback write_callback,
441 FLAC__StreamDecoderMetadataCallback metadata_callback,
442 FLAC__StreamDecoderErrorCallback error_callback,
443 void *client_data
444 )
445 {
446 return init_stream_internal_(
447 decoder,
448 read_callback,
449 seek_callback,
450 tell_callback,
451 length_callback,
452 eof_callback,
453 write_callback,
454 metadata_callback,
455 error_callback,
456 client_data,
457 /*is_ogg=*/true
458 );
459 }
460
init_FILE_internal_(FLAC__StreamDecoder * decoder,FILE * file,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data,FLAC__bool is_ogg)461 static FLAC__StreamDecoderInitStatus init_FILE_internal_(
462 FLAC__StreamDecoder *decoder,
463 FILE *file,
464 FLAC__StreamDecoderWriteCallback write_callback,
465 FLAC__StreamDecoderMetadataCallback metadata_callback,
466 FLAC__StreamDecoderErrorCallback error_callback,
467 void *client_data,
468 FLAC__bool is_ogg
469 )
470 {
471 FLAC__ASSERT(0 != decoder);
472 FLAC__ASSERT(0 != file);
473
474 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
475 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
476
477 if(0 == write_callback || 0 == error_callback)
478 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
479
480 /*
481 * To make sure that our file does not go unclosed after an error, we
482 * must assign the FILE pointer before any further error can occur in
483 * this routine.
484 */
485 if(file == stdin)
486 file = get_binary_stdin_(); /* just to be safe */
487
488 decoder->private_->file = file;
489
490 return init_stream_internal_(
491 decoder,
492 file_read_callback_,
493 decoder->private_->file == stdin? 0: file_seek_callback_,
494 decoder->private_->file == stdin? 0: file_tell_callback_,
495 decoder->private_->file == stdin? 0: file_length_callback_,
496 file_eof_callback_,
497 write_callback,
498 metadata_callback,
499 error_callback,
500 client_data,
501 is_ogg
502 );
503 }
504
FLAC__stream_decoder_init_FILE(FLAC__StreamDecoder * decoder,FILE * file,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)505 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE(
506 FLAC__StreamDecoder *decoder,
507 FILE *file,
508 FLAC__StreamDecoderWriteCallback write_callback,
509 FLAC__StreamDecoderMetadataCallback metadata_callback,
510 FLAC__StreamDecoderErrorCallback error_callback,
511 void *client_data
512 )
513 {
514 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
515 }
516
FLAC__stream_decoder_init_ogg_FILE(FLAC__StreamDecoder * decoder,FILE * file,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)517 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE(
518 FLAC__StreamDecoder *decoder,
519 FILE *file,
520 FLAC__StreamDecoderWriteCallback write_callback,
521 FLAC__StreamDecoderMetadataCallback metadata_callback,
522 FLAC__StreamDecoderErrorCallback error_callback,
523 void *client_data
524 )
525 {
526 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
527 }
528
init_file_internal_(FLAC__StreamDecoder * decoder,const char * filename,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data,FLAC__bool is_ogg)529 static FLAC__StreamDecoderInitStatus init_file_internal_(
530 FLAC__StreamDecoder *decoder,
531 const char *filename,
532 FLAC__StreamDecoderWriteCallback write_callback,
533 FLAC__StreamDecoderMetadataCallback metadata_callback,
534 FLAC__StreamDecoderErrorCallback error_callback,
535 void *client_data,
536 FLAC__bool is_ogg
537 )
538 {
539 FILE *file;
540
541 FLAC__ASSERT(0 != decoder);
542
543 /*
544 * To make sure that our file does not go unclosed after an error, we
545 * have to do the same entrance checks here that are later performed
546 * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned.
547 */
548 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
549 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
550
551 if(0 == write_callback || 0 == error_callback)
552 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
553
554 file = filename? flac_fopen(filename, "rb") : stdin;
555
556 if(0 == file)
557 return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
558
559 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg);
560 }
561
FLAC__stream_decoder_init_file(FLAC__StreamDecoder * decoder,const char * filename,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)562 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file(
563 FLAC__StreamDecoder *decoder,
564 const char *filename,
565 FLAC__StreamDecoderWriteCallback write_callback,
566 FLAC__StreamDecoderMetadataCallback metadata_callback,
567 FLAC__StreamDecoderErrorCallback error_callback,
568 void *client_data
569 )
570 {
571 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
572 }
573
FLAC__stream_decoder_init_ogg_file(FLAC__StreamDecoder * decoder,const char * filename,FLAC__StreamDecoderWriteCallback write_callback,FLAC__StreamDecoderMetadataCallback metadata_callback,FLAC__StreamDecoderErrorCallback error_callback,void * client_data)574 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file(
575 FLAC__StreamDecoder *decoder,
576 const char *filename,
577 FLAC__StreamDecoderWriteCallback write_callback,
578 FLAC__StreamDecoderMetadataCallback metadata_callback,
579 FLAC__StreamDecoderErrorCallback error_callback,
580 void *client_data
581 )
582 {
583 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
584 }
585
FLAC__stream_decoder_finish(FLAC__StreamDecoder * decoder)586 FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
587 {
588 FLAC__bool md5_failed = false;
589 uint32_t i;
590
591 FLAC__ASSERT(0 != decoder);
592 FLAC__ASSERT(0 != decoder->private_);
593 FLAC__ASSERT(0 != decoder->protected_);
594
595 if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
596 return true;
597
598 /* see the comment in FLAC__stream_decoder_reset() as to why we
599 * always call FLAC__MD5Final()
600 */
601 FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
602
603 free(decoder->private_->seek_table.data.seek_table.points);
604 decoder->private_->seek_table.data.seek_table.points = 0;
605 decoder->private_->has_seek_table = false;
606
607 FLAC__bitreader_free(decoder->private_->input);
608 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
609 /* WATCHOUT:
610 * FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN()
611 * require that the output arrays have a buffer of up to 3 zeroes
612 * in front (at negative indices) for alignment purposes;
613 * we use 4 to keep the data well-aligned.
614 */
615 if(0 != decoder->private_->output[i]) {
616 free(decoder->private_->output[i]-4);
617 decoder->private_->output[i] = 0;
618 }
619 if(0 != decoder->private_->residual_unaligned[i]) {
620 free(decoder->private_->residual_unaligned[i]);
621 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
622 }
623 }
624 if(0 != decoder->private_->side_subframe) {
625 free(decoder->private_->side_subframe);
626 decoder->private_->side_subframe = 0;
627 }
628 decoder->private_->output_capacity = 0;
629 decoder->private_->output_channels = 0;
630
631 #if FLAC__HAS_OGG
632 if(decoder->private_->is_ogg)
633 FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect);
634 #endif
635
636 if(0 != decoder->private_->file) {
637 if(decoder->private_->file != stdin)
638 fclose(decoder->private_->file);
639 decoder->private_->file = 0;
640 }
641
642 if(decoder->private_->do_md5_checking) {
643 if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16))
644 md5_failed = true;
645 }
646 decoder->private_->is_seeking = false;
647
648 set_defaults_(decoder);
649
650 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
651
652 return !md5_failed;
653 }
654
FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder * decoder,long value)655 FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value)
656 {
657 FLAC__ASSERT(0 != decoder);
658 FLAC__ASSERT(0 != decoder->private_);
659 FLAC__ASSERT(0 != decoder->protected_);
660 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
661 return false;
662 #if FLAC__HAS_OGG
663 /* can't check decoder->private_->is_ogg since that's not set until init time */
664 FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value);
665 return true;
666 #else
667 (void)value;
668 return false;
669 #endif
670 }
671
FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder * decoder,FLAC__bool value)672 FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value)
673 {
674 FLAC__ASSERT(0 != decoder);
675 FLAC__ASSERT(0 != decoder->protected_);
676 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
677 return false;
678 decoder->protected_->md5_checking = value;
679 return true;
680 }
681
FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder * decoder,FLAC__MetadataType type)682 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
683 {
684 FLAC__ASSERT(0 != decoder);
685 FLAC__ASSERT(0 != decoder->private_);
686 FLAC__ASSERT(0 != decoder->protected_);
687 FLAC__ASSERT((uint32_t)type <= FLAC__MAX_METADATA_TYPE_CODE);
688 /* double protection */
689 if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE)
690 return false;
691 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
692 return false;
693 decoder->private_->metadata_filter[type] = true;
694 if(type == FLAC__METADATA_TYPE_APPLICATION)
695 decoder->private_->metadata_filter_ids_count = 0;
696 return true;
697 }
698
FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder * decoder,const FLAC__byte id[4])699 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
700 {
701 FLAC__ASSERT(0 != decoder);
702 FLAC__ASSERT(0 != decoder->private_);
703 FLAC__ASSERT(0 != decoder->protected_);
704 FLAC__ASSERT(0 != id);
705 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
706 return false;
707
708 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
709 return true;
710
711 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
712
713 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
714 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
715 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
716 return false;
717 }
718 decoder->private_->metadata_filter_ids_capacity *= 2;
719 }
720
721 memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
722 decoder->private_->metadata_filter_ids_count++;
723
724 return true;
725 }
726
FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder * decoder)727 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
728 {
729 uint32_t i;
730 FLAC__ASSERT(0 != decoder);
731 FLAC__ASSERT(0 != decoder->private_);
732 FLAC__ASSERT(0 != decoder->protected_);
733 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
734 return false;
735 for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
736 decoder->private_->metadata_filter[i] = true;
737 decoder->private_->metadata_filter_ids_count = 0;
738 return true;
739 }
740
FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder * decoder,FLAC__MetadataType type)741 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
742 {
743 FLAC__ASSERT(0 != decoder);
744 FLAC__ASSERT(0 != decoder->private_);
745 FLAC__ASSERT(0 != decoder->protected_);
746 FLAC__ASSERT((uint32_t)type <= FLAC__MAX_METADATA_TYPE_CODE);
747 /* double protection */
748 if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE)
749 return false;
750 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
751 return false;
752 decoder->private_->metadata_filter[type] = false;
753 if(type == FLAC__METADATA_TYPE_APPLICATION)
754 decoder->private_->metadata_filter_ids_count = 0;
755 return true;
756 }
757
FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder * decoder,const FLAC__byte id[4])758 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
759 {
760 FLAC__ASSERT(0 != decoder);
761 FLAC__ASSERT(0 != decoder->private_);
762 FLAC__ASSERT(0 != decoder->protected_);
763 FLAC__ASSERT(0 != id);
764 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
765 return false;
766
767 if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
768 return true;
769
770 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
771
772 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
773 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
774 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
775 return false;
776 }
777 decoder->private_->metadata_filter_ids_capacity *= 2;
778 }
779
780 memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
781 decoder->private_->metadata_filter_ids_count++;
782
783 return true;
784 }
785
FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder * decoder)786 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
787 {
788 FLAC__ASSERT(0 != decoder);
789 FLAC__ASSERT(0 != decoder->private_);
790 FLAC__ASSERT(0 != decoder->protected_);
791 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
792 return false;
793 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
794 decoder->private_->metadata_filter_ids_count = 0;
795 return true;
796 }
797
FLAC__stream_decoder_get_state(const FLAC__StreamDecoder * decoder)798 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
799 {
800 FLAC__ASSERT(0 != decoder);
801 FLAC__ASSERT(0 != decoder->protected_);
802 return decoder->protected_->state;
803 }
804
FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder * decoder)805 FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder)
806 {
807 return FLAC__StreamDecoderStateString[decoder->protected_->state];
808 }
809
FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder * decoder)810 FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder)
811 {
812 FLAC__ASSERT(0 != decoder);
813 FLAC__ASSERT(0 != decoder->protected_);
814 return decoder->protected_->md5_checking;
815 }
816
FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder * decoder)817 FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder)
818 {
819 FLAC__ASSERT(0 != decoder);
820 FLAC__ASSERT(0 != decoder->protected_);
821 return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0;
822 }
823
FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder * decoder)824 FLAC_API uint32_t FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
825 {
826 FLAC__ASSERT(0 != decoder);
827 FLAC__ASSERT(0 != decoder->protected_);
828 return decoder->protected_->channels;
829 }
830
FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder * decoder)831 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
832 {
833 FLAC__ASSERT(0 != decoder);
834 FLAC__ASSERT(0 != decoder->protected_);
835 return decoder->protected_->channel_assignment;
836 }
837
FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder * decoder)838 FLAC_API uint32_t FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
839 {
840 FLAC__ASSERT(0 != decoder);
841 FLAC__ASSERT(0 != decoder->protected_);
842 return decoder->protected_->bits_per_sample;
843 }
844
FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder * decoder)845 FLAC_API uint32_t FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
846 {
847 FLAC__ASSERT(0 != decoder);
848 FLAC__ASSERT(0 != decoder->protected_);
849 return decoder->protected_->sample_rate;
850 }
851
FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder * decoder)852 FLAC_API uint32_t FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
853 {
854 FLAC__ASSERT(0 != decoder);
855 FLAC__ASSERT(0 != decoder->protected_);
856 return decoder->protected_->blocksize;
857 }
858
FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder * decoder,FLAC__uint64 * position)859 FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position)
860 {
861 FLAC__ASSERT(0 != decoder);
862 FLAC__ASSERT(0 != decoder->private_);
863 FLAC__ASSERT(0 != position);
864
865 if(FLAC__HAS_OGG && decoder->private_->is_ogg)
866 return false;
867
868 if(0 == decoder->private_->tell_callback)
869 return false;
870 if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK)
871 return false;
872 /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */
873 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input))
874 return false;
875 FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder));
876 *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder);
877 return true;
878 }
879
FLAC__stream_decoder_get_client_data(FLAC__StreamDecoder * decoder)880 FLAC_API const void *FLAC__stream_decoder_get_client_data(FLAC__StreamDecoder *decoder)
881 {
882 return decoder->private_->client_data;
883 }
884
FLAC__stream_decoder_flush(FLAC__StreamDecoder * decoder)885 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
886 {
887 FLAC__ASSERT(0 != decoder);
888 FLAC__ASSERT(0 != decoder->private_);
889 FLAC__ASSERT(0 != decoder->protected_);
890
891 if(!decoder->private_->internal_reset_hack && decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
892 return false;
893
894 decoder->private_->samples_decoded = 0;
895 decoder->private_->do_md5_checking = false;
896 decoder->private_->last_seen_framesync = 0;
897 decoder->private_->last_frame_is_set = false;
898
899 #if FLAC__HAS_OGG
900 if(decoder->private_->is_ogg)
901 FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect);
902 #endif
903
904 if(!FLAC__bitreader_clear(decoder->private_->input)) {
905 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
906 return false;
907 }
908 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
909
910 return true;
911 }
912
FLAC__stream_decoder_reset(FLAC__StreamDecoder * decoder)913 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
914 {
915 FLAC__ASSERT(0 != decoder);
916 FLAC__ASSERT(0 != decoder->private_);
917 FLAC__ASSERT(0 != decoder->protected_);
918
919 if(!FLAC__stream_decoder_flush(decoder)) {
920 /* above call sets the state for us */
921 return false;
922 }
923
924 #if FLAC__HAS_OGG
925 /*@@@ could go in !internal_reset_hack block below */
926 if(decoder->private_->is_ogg)
927 FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect);
928 #endif
929
930 /* Rewind if necessary. If FLAC__stream_decoder_init() is calling us,
931 * (internal_reset_hack) don't try to rewind since we are already at
932 * the beginning of the stream and don't want to fail if the input is
933 * not seekable.
934 */
935 if(!decoder->private_->internal_reset_hack) {
936 if(decoder->private_->file == stdin)
937 return false; /* can't rewind stdin, reset fails */
938 if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR)
939 return false; /* seekable and seek fails, reset fails */
940 }
941
942 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
943
944 decoder->private_->has_stream_info = false;
945
946 free(decoder->private_->seek_table.data.seek_table.points);
947 decoder->private_->seek_table.data.seek_table.points = 0;
948 decoder->private_->has_seek_table = false;
949
950 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
951 /*
952 * This goes in reset() and not flush() because according to the spec, a
953 * fixed-blocksize stream must stay that way through the whole stream.
954 */
955 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
956
957 /* We initialize the FLAC__MD5Context even though we may never use it. This
958 * is because md5 checking may be turned on to start and then turned off if
959 * a seek occurs. So we init the context here and finalize it in
960 * FLAC__stream_decoder_finish() to make sure things are always cleaned up
961 * properly.
962 */
963 if(!decoder->private_->internal_reset_hack) {
964 /* Only finish MD5 context when it has been initialized
965 * (i.e. when internal_reset_hack is not set) */
966 FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
967 }
968 else
969 decoder->private_->internal_reset_hack = false;
970 FLAC__MD5Init(&decoder->private_->md5context);
971
972 decoder->private_->first_frame_offset = 0;
973 decoder->private_->unparseable_frame_count = 0;
974 decoder->private_->last_seen_framesync = 0;
975 decoder->private_->last_frame_is_set = false;
976
977 return true;
978 }
979
FLAC__stream_decoder_process_single(FLAC__StreamDecoder * decoder)980 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
981 {
982 FLAC__bool got_a_frame;
983 FLAC__ASSERT(0 != decoder);
984 FLAC__ASSERT(0 != decoder->protected_);
985
986 while(1) {
987 switch(decoder->protected_->state) {
988 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
989 if(!find_metadata_(decoder))
990 return false; /* above function sets the status for us */
991 break;
992 case FLAC__STREAM_DECODER_READ_METADATA:
993 if(!read_metadata_(decoder))
994 return false; /* above function sets the status for us */
995 else
996 return true;
997 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
998 if(!frame_sync_(decoder))
999 return true; /* above function sets the status for us */
1000 break;
1001 case FLAC__STREAM_DECODER_READ_FRAME:
1002 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true))
1003 return false; /* above function sets the status for us */
1004 if(got_a_frame)
1005 return true; /* above function sets the status for us */
1006 break;
1007 case FLAC__STREAM_DECODER_END_OF_STREAM:
1008 case FLAC__STREAM_DECODER_ABORTED:
1009 return true;
1010 default:
1011 return false;
1012 }
1013 }
1014 }
1015
FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder * decoder)1016 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
1017 {
1018 FLAC__ASSERT(0 != decoder);
1019 FLAC__ASSERT(0 != decoder->protected_);
1020
1021 while(1) {
1022 switch(decoder->protected_->state) {
1023 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1024 if(!find_metadata_(decoder))
1025 return false; /* above function sets the status for us */
1026 break;
1027 case FLAC__STREAM_DECODER_READ_METADATA:
1028 if(!read_metadata_(decoder))
1029 return false; /* above function sets the status for us */
1030 break;
1031 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1032 case FLAC__STREAM_DECODER_READ_FRAME:
1033 case FLAC__STREAM_DECODER_END_OF_STREAM:
1034 case FLAC__STREAM_DECODER_ABORTED:
1035 return true;
1036 default:
1037 return false;
1038 }
1039 }
1040 }
1041
FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder * decoder)1042 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
1043 {
1044 FLAC__bool dummy;
1045 FLAC__ASSERT(0 != decoder);
1046 FLAC__ASSERT(0 != decoder->protected_);
1047
1048 while(1) {
1049 switch(decoder->protected_->state) {
1050 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1051 if(!find_metadata_(decoder))
1052 return false; /* above function sets the status for us */
1053 break;
1054 case FLAC__STREAM_DECODER_READ_METADATA:
1055 if(!read_metadata_(decoder))
1056 return false; /* above function sets the status for us */
1057 break;
1058 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1059 if(!frame_sync_(decoder))
1060 return true; /* above function sets the status for us */
1061 break;
1062 case FLAC__STREAM_DECODER_READ_FRAME:
1063 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true))
1064 return false; /* above function sets the status for us */
1065 break;
1066 case FLAC__STREAM_DECODER_END_OF_STREAM:
1067 case FLAC__STREAM_DECODER_ABORTED:
1068 return true;
1069 default:
1070 return false;
1071 }
1072 }
1073 }
1074
FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder * decoder)1075 FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder)
1076 {
1077 FLAC__bool got_a_frame;
1078 FLAC__ASSERT(0 != decoder);
1079 FLAC__ASSERT(0 != decoder->protected_);
1080
1081 while(1) {
1082 switch(decoder->protected_->state) {
1083 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1084 case FLAC__STREAM_DECODER_READ_METADATA:
1085 return false; /* above function sets the status for us */
1086 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1087 if(!frame_sync_(decoder))
1088 return true; /* above function sets the status for us */
1089 break;
1090 case FLAC__STREAM_DECODER_READ_FRAME:
1091 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false))
1092 return false; /* above function sets the status for us */
1093 if(got_a_frame)
1094 return true; /* above function sets the status for us */
1095 break;
1096 case FLAC__STREAM_DECODER_END_OF_STREAM:
1097 case FLAC__STREAM_DECODER_ABORTED:
1098 return true;
1099 default:
1100 return false;
1101 }
1102 }
1103 }
1104
FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder * decoder,FLAC__uint64 sample)1105 FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample)
1106 {
1107 FLAC__uint64 length;
1108
1109 FLAC__ASSERT(0 != decoder);
1110
1111 if(
1112 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA &&
1113 decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA &&
1114 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC &&
1115 decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME &&
1116 decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM
1117 )
1118 return false;
1119
1120 if(0 == decoder->private_->seek_callback)
1121 return false;
1122
1123 FLAC__ASSERT(decoder->private_->seek_callback);
1124 FLAC__ASSERT(decoder->private_->tell_callback);
1125 FLAC__ASSERT(decoder->private_->length_callback);
1126 FLAC__ASSERT(decoder->private_->eof_callback);
1127
1128 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder))
1129 return false;
1130
1131 decoder->private_->is_seeking = true;
1132
1133 /* turn off md5 checking if a seek is attempted */
1134 decoder->private_->do_md5_checking = false;
1135
1136 /* get the file length (currently our algorithm needs to know the length so it's also an error to get FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED) */
1137 if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) {
1138 decoder->private_->is_seeking = false;
1139 return false;
1140 }
1141
1142 /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */
1143 if(
1144 decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA ||
1145 decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA
1146 ) {
1147 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) {
1148 /* above call sets the state for us */
1149 decoder->private_->is_seeking = false;
1150 return false;
1151 }
1152 /* check this again in case we didn't know total_samples the first time */
1153 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) {
1154 decoder->private_->is_seeking = false;
1155 return false;
1156 }
1157 }
1158
1159 {
1160 const FLAC__bool ok =
1161 #if FLAC__HAS_OGG
1162 decoder->private_->is_ogg?
1163 seek_to_absolute_sample_ogg_(decoder, length, sample) :
1164 #endif
1165 seek_to_absolute_sample_(decoder, length, sample)
1166 ;
1167 decoder->private_->is_seeking = false;
1168 return ok;
1169 }
1170 }
1171
1172 /***********************************************************************
1173 *
1174 * Protected class methods
1175 *
1176 ***********************************************************************/
1177
FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder * decoder)1178 uint32_t FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
1179 {
1180 FLAC__ASSERT(0 != decoder);
1181 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1182 FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7));
1183 return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8;
1184 }
1185
1186 /***********************************************************************
1187 *
1188 * Private class methods
1189 *
1190 ***********************************************************************/
1191
set_defaults_(FLAC__StreamDecoder * decoder)1192 void set_defaults_(FLAC__StreamDecoder *decoder)
1193 {
1194 decoder->private_->is_ogg = false;
1195 decoder->private_->read_callback = 0;
1196 decoder->private_->seek_callback = 0;
1197 decoder->private_->tell_callback = 0;
1198 decoder->private_->length_callback = 0;
1199 decoder->private_->eof_callback = 0;
1200 decoder->private_->write_callback = 0;
1201 decoder->private_->metadata_callback = 0;
1202 decoder->private_->error_callback = 0;
1203 decoder->private_->client_data = 0;
1204
1205 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
1206 decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
1207 decoder->private_->metadata_filter_ids_count = 0;
1208
1209 decoder->protected_->md5_checking = false;
1210
1211 #if FLAC__HAS_OGG
1212 FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect);
1213 #endif
1214 }
1215
1216 /*
1217 * This will forcibly set stdin to binary mode (for OSes that require it)
1218 */
get_binary_stdin_(void)1219 FILE *get_binary_stdin_(void)
1220 {
1221 /* if something breaks here it is probably due to the presence or
1222 * absence of an underscore before the identifiers 'setmode',
1223 * 'fileno', and/or 'O_BINARY'; check your system header files.
1224 */
1225 #if defined _MSC_VER || defined __MINGW32__
1226 _setmode(_fileno(stdin), _O_BINARY);
1227 #elif defined __EMX__
1228 setmode(fileno(stdin), O_BINARY);
1229 #endif
1230
1231 return stdin;
1232 }
1233
allocate_output_(FLAC__StreamDecoder * decoder,uint32_t size,uint32_t channels,uint32_t bps)1234 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels, uint32_t bps)
1235 {
1236 uint32_t i;
1237 FLAC__int32 *tmp;
1238
1239 if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels &&
1240 (bps < 32 || decoder->private_->side_subframe != 0))
1241 return true;
1242
1243 /* simply using realloc() is not practical because the number of channels may change mid-stream */
1244
1245 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
1246 if(0 != decoder->private_->output[i]) {
1247 free(decoder->private_->output[i]-4);
1248 decoder->private_->output[i] = 0;
1249 }
1250 if(0 != decoder->private_->residual_unaligned[i]) {
1251 free(decoder->private_->residual_unaligned[i]);
1252 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
1253 }
1254 }
1255
1256 if(0 != decoder->private_->side_subframe) {
1257 free(decoder->private_->side_subframe);
1258 decoder->private_->side_subframe = 0;
1259 }
1260
1261 for(i = 0; i < channels; i++) {
1262 /* WATCHOUT:
1263 * FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN()
1264 * require that the output arrays have a buffer of up to 3 zeroes
1265 * in front (at negative indices) for alignment purposes;
1266 * we use 4 to keep the data well-aligned.
1267 */
1268 tmp = safe_malloc_muladd2_(sizeof(FLAC__int32), /*times (*/size, /*+*/4/*)*/);
1269 if(tmp == 0) {
1270 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1271 return false;
1272 }
1273 memset(tmp, 0, sizeof(FLAC__int32)*4);
1274 decoder->private_->output[i] = tmp + 4;
1275
1276 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) {
1277 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1278 return false;
1279 }
1280 }
1281
1282 if(bps == 32) {
1283 decoder->private_->side_subframe = safe_malloc_mul_2op_p(sizeof(FLAC__int64), /*times (*/size);
1284 if(decoder->private_->side_subframe == NULL) {
1285 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1286 return false;
1287 }
1288 }
1289
1290 decoder->private_->output_capacity = size;
1291 decoder->private_->output_channels = channels;
1292
1293 return true;
1294 }
1295
has_id_filtered_(FLAC__StreamDecoder * decoder,FLAC__byte * id)1296 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
1297 {
1298 size_t i;
1299
1300 FLAC__ASSERT(0 != decoder);
1301 FLAC__ASSERT(0 != decoder->private_);
1302
1303 for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
1304 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
1305 return true;
1306
1307 return false;
1308 }
1309
find_metadata_(FLAC__StreamDecoder * decoder)1310 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
1311 {
1312 FLAC__uint32 x;
1313 uint32_t i, id;
1314 FLAC__bool first = true;
1315
1316 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1317
1318 for(i = id = 0; i < 4; ) {
1319 if(decoder->private_->cached) {
1320 x = (FLAC__uint32)decoder->private_->lookahead;
1321 decoder->private_->cached = false;
1322 }
1323 else {
1324 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1325 return false; /* read_callback_ sets the state for us */
1326 }
1327 if(x == FLAC__STREAM_SYNC_STRING[i]) {
1328 first = true;
1329 i++;
1330 id = 0;
1331 continue;
1332 }
1333
1334 if(id >= 3)
1335 return false;
1336
1337 if(x == ID3V2_TAG_[id]) {
1338 id++;
1339 i = 0;
1340 if(id == 3) {
1341 if(!skip_id3v2_tag_(decoder))
1342 return false; /* skip_id3v2_tag_ sets the state for us */
1343 }
1344 continue;
1345 }
1346 id = 0;
1347 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1348 decoder->private_->header_warmup[0] = (FLAC__byte)x;
1349 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1350 return false; /* read_callback_ sets the state for us */
1351
1352 /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
1353 /* else we have to check if the second byte is the end of a sync code */
1354 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1355 decoder->private_->lookahead = (FLAC__byte)x;
1356 decoder->private_->cached = true;
1357 }
1358 else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
1359 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1360 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1361 return true;
1362 }
1363 }
1364 i = 0;
1365 if(first) {
1366 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
1367 first = false;
1368 }
1369 }
1370
1371 decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
1372 return true;
1373 }
1374
read_metadata_(FLAC__StreamDecoder * decoder)1375 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
1376 {
1377 FLAC__bool is_last;
1378 FLAC__uint32 i, x, type, length;
1379
1380 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1381
1382 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN))
1383 return false; /* read_callback_ sets the state for us */
1384 is_last = x? true : false;
1385
1386 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN))
1387 return false; /* read_callback_ sets the state for us */
1388
1389 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN))
1390 return false; /* read_callback_ sets the state for us */
1391
1392 if(type == FLAC__METADATA_TYPE_STREAMINFO) {
1393 if(!read_metadata_streaminfo_(decoder, is_last, length))
1394 return false;
1395
1396 decoder->private_->has_stream_info = true;
1397 if(0 == memcmp(decoder->private_->stream_info.data.stream_info.md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16))
1398 decoder->private_->do_md5_checking = false;
1399 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback)
1400 decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
1401 }
1402 else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
1403 /* just in case we already have a seek table, and reading the next one fails: */
1404 decoder->private_->has_seek_table = false;
1405
1406 if(!read_metadata_seektable_(decoder, is_last, length))
1407 return false;
1408
1409 decoder->private_->has_seek_table = true;
1410 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback)
1411 decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
1412 }
1413 else {
1414 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
1415 uint32_t real_length = length;
1416 FLAC__StreamMetadata block;
1417
1418 memset(&block, 0, sizeof(block));
1419 block.is_last = is_last;
1420 block.type = (FLAC__MetadataType)type;
1421 block.length = length;
1422
1423 if(type == FLAC__METADATA_TYPE_APPLICATION) {
1424 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))
1425 return false; /* read_callback_ sets the state for us */
1426
1427 if(real_length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) { /* underflow check */
1428 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;/*@@@@@@ maybe wrong error? need to resync?*/
1429 return false;
1430 }
1431
1432 real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
1433
1434 if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
1435 skip_it = !skip_it;
1436 }
1437
1438 if(skip_it) {
1439 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1440 return false; /* read_callback_ sets the state for us */
1441 }
1442 else {
1443 FLAC__bool ok = true;
1444 FLAC__bitreader_set_limit(decoder->private_->input, real_length*8);
1445 switch(type) {
1446 case FLAC__METADATA_TYPE_PADDING:
1447 /* skip the padding bytes */
1448 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1449 ok = false; /* read_callback_ sets the state for us */
1450 break;
1451 case FLAC__METADATA_TYPE_APPLICATION:
1452 /* remember, we read the ID already */
1453 if(real_length > 0) {
1454 if(0 == (block.data.application.data = malloc(real_length))) {
1455 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1456 ok = false;
1457 }
1458 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length))
1459 ok = false; /* read_callback_ sets the state for us */
1460 }
1461 else
1462 block.data.application.data = 0;
1463 break;
1464 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1465 if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment, real_length))
1466 ok = false;
1467 break;
1468 case FLAC__METADATA_TYPE_CUESHEET:
1469 if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet))
1470 ok = false;
1471 break;
1472 case FLAC__METADATA_TYPE_PICTURE:
1473 if(!read_metadata_picture_(decoder, &block.data.picture))
1474 ok = false;
1475 break;
1476 case FLAC__METADATA_TYPE_STREAMINFO:
1477 case FLAC__METADATA_TYPE_SEEKTABLE:
1478 FLAC__ASSERT(0);
1479 break;
1480 default:
1481 if(real_length > 0) {
1482 if(0 == (block.data.unknown.data = malloc(real_length))) {
1483 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1484 ok = false;
1485 }
1486 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length))
1487 ok = false; /* read_callback_ sets the state for us */
1488 }
1489 else
1490 block.data.unknown.data = 0;
1491 break;
1492 }
1493 if(FLAC__bitreader_limit_remaining(decoder->private_->input) > 0) {
1494 /* Content in metadata block didn't fit in block length
1495 * We cannot know whether the length or the content was
1496 * corrupt, so stop parsing metadata */
1497 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_METADATA);
1498 if(decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA)
1499 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1500 ok = false;
1501 }
1502 FLAC__bitreader_remove_limit(decoder->private_->input);
1503 if(ok && !decoder->private_->is_seeking && decoder->private_->metadata_callback)
1504 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1505
1506 /* now we have to free any malloc()ed data in the block */
1507 switch(type) {
1508 case FLAC__METADATA_TYPE_PADDING:
1509 break;
1510 case FLAC__METADATA_TYPE_APPLICATION:
1511 if(0 != block.data.application.data)
1512 free(block.data.application.data);
1513 break;
1514 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1515 if(0 != block.data.vorbis_comment.vendor_string.entry)
1516 free(block.data.vorbis_comment.vendor_string.entry);
1517 if(block.data.vorbis_comment.num_comments > 0)
1518 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1519 if(0 != block.data.vorbis_comment.comments[i].entry)
1520 free(block.data.vorbis_comment.comments[i].entry);
1521 if(0 != block.data.vorbis_comment.comments)
1522 free(block.data.vorbis_comment.comments);
1523 break;
1524 case FLAC__METADATA_TYPE_CUESHEET:
1525 if(block.data.cue_sheet.num_tracks > 0 && 0 != block.data.cue_sheet.tracks)
1526 for(i = 0; i < block.data.cue_sheet.num_tracks; i++)
1527 if(0 != block.data.cue_sheet.tracks[i].indices)
1528 free(block.data.cue_sheet.tracks[i].indices);
1529 if(0 != block.data.cue_sheet.tracks)
1530 free(block.data.cue_sheet.tracks);
1531 break;
1532 case FLAC__METADATA_TYPE_PICTURE:
1533 if(0 != block.data.picture.mime_type)
1534 free(block.data.picture.mime_type);
1535 if(0 != block.data.picture.description)
1536 free(block.data.picture.description);
1537 if(0 != block.data.picture.data)
1538 free(block.data.picture.data);
1539 break;
1540 case FLAC__METADATA_TYPE_STREAMINFO:
1541 case FLAC__METADATA_TYPE_SEEKTABLE:
1542 FLAC__ASSERT(0);
1543 default:
1544 if(0 != block.data.unknown.data)
1545 free(block.data.unknown.data);
1546 break;
1547 }
1548
1549 if(!ok) /* anything that unsets "ok" should also make sure decoder->protected_->state is updated */
1550 return false;
1551 }
1552 }
1553
1554 if(is_last) {
1555 /* if this fails, it's OK, it's just a hint for the seek routine */
1556 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset))
1557 decoder->private_->first_frame_offset = 0;
1558 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1559 }
1560
1561 return true;
1562 }
1563
read_metadata_streaminfo_(FLAC__StreamDecoder * decoder,FLAC__bool is_last,uint32_t length)1564 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length)
1565 {
1566 FLAC__uint32 x;
1567 uint32_t bits, used_bits = 0;
1568
1569 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1570
1571 decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
1572 decoder->private_->stream_info.is_last = is_last;
1573 decoder->private_->stream_info.length = length;
1574
1575 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
1576 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits))
1577 return false; /* read_callback_ sets the state for us */
1578 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
1579 used_bits += bits;
1580
1581 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
1582 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN))
1583 return false; /* read_callback_ sets the state for us */
1584 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
1585 used_bits += bits;
1586
1587 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
1588 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN))
1589 return false; /* read_callback_ sets the state for us */
1590 decoder->private_->stream_info.data.stream_info.min_framesize = x;
1591 used_bits += bits;
1592
1593 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
1594 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN))
1595 return false; /* read_callback_ sets the state for us */
1596 decoder->private_->stream_info.data.stream_info.max_framesize = x;
1597 used_bits += bits;
1598
1599 bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
1600 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN))
1601 return false; /* read_callback_ sets the state for us */
1602 decoder->private_->stream_info.data.stream_info.sample_rate = x;
1603 used_bits += bits;
1604
1605 bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
1606 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN))
1607 return false; /* read_callback_ sets the state for us */
1608 decoder->private_->stream_info.data.stream_info.channels = x+1;
1609 used_bits += bits;
1610
1611 bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
1612 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN))
1613 return false; /* read_callback_ sets the state for us */
1614 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
1615 used_bits += bits;
1616
1617 bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
1618 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &decoder->private_->stream_info.data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN))
1619 return false; /* read_callback_ sets the state for us */
1620 used_bits += bits;
1621
1622 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16))
1623 return false; /* read_callback_ sets the state for us */
1624 used_bits += 16*8;
1625
1626 /* skip the rest of the block */
1627 FLAC__ASSERT(used_bits % 8 == 0);
1628 if (length < (used_bits / 8))
1629 return false; /* read_callback_ sets the state for us */
1630 length -= (used_bits / 8);
1631 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1632 return false; /* read_callback_ sets the state for us */
1633
1634 return true;
1635 }
1636
read_metadata_seektable_(FLAC__StreamDecoder * decoder,FLAC__bool is_last,uint32_t length)1637 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length)
1638 {
1639 FLAC__uint32 i, x;
1640 FLAC__uint64 xx;
1641
1642 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1643
1644 decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
1645 decoder->private_->seek_table.is_last = is_last;
1646 decoder->private_->seek_table.length = length;
1647
1648 if(length % FLAC__STREAM_METADATA_SEEKPOINT_LENGTH) {
1649 FLAC__bitreader_limit_invalidate(decoder->private_->input);
1650 return false;
1651 }
1652
1653 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1654
1655 /* use realloc since we may pass through here several times (e.g. after seeking) */
1656 if(0 == (decoder->private_->seek_table.data.seek_table.points = safe_realloc_mul_2op_(decoder->private_->seek_table.data.seek_table.points, decoder->private_->seek_table.data.seek_table.num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint)))) {
1657 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1658 return false;
1659 }
1660 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
1661 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN))
1662 return false; /* read_callback_ sets the state for us */
1663 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
1664
1665 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN))
1666 return false; /* read_callback_ sets the state for us */
1667 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
1668
1669 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN))
1670 return false; /* read_callback_ sets the state for us */
1671 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
1672 }
1673 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
1674
1675 FLAC__ASSERT(length == 0);
1676
1677 return true;
1678 }
1679
read_metadata_vorbiscomment_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_VorbisComment * obj,uint32_t length)1680 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length)
1681 {
1682 FLAC__uint32 i;
1683
1684 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1685
1686 /* read vendor string */
1687 if (length >= 8) {
1688 length -= 8; /* vendor string length + num comments entries alone take 8 bytes */
1689 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1690 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length))
1691 return false; /* read_callback_ sets the state for us */
1692 if (obj->vendor_string.length > 0) {
1693 if (length < obj->vendor_string.length) {
1694 obj->vendor_string.length = 0;
1695 obj->vendor_string.entry = 0;
1696 goto skip;
1697 }
1698 else
1699 length -= obj->vendor_string.length;
1700 if (0 == (obj->vendor_string.entry = safe_malloc_add_2op_(obj->vendor_string.length, /*+*/1))) {
1701 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1702 return false;
1703 }
1704 if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length))
1705 return false; /* read_callback_ sets the state for us */
1706 obj->vendor_string.entry[obj->vendor_string.length] = '\0';
1707 }
1708 else
1709 obj->vendor_string.entry = 0;
1710
1711 /* read num comments */
1712 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
1713 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments))
1714 return false; /* read_callback_ sets the state for us */
1715
1716 /* read comments */
1717 if (obj->num_comments > 100000) {
1718 /* Possibly malicious file. */
1719 obj->num_comments = 0;
1720 return false;
1721 }
1722 if (obj->num_comments > 0) {
1723 if (0 == (obj->comments = safe_malloc_mul_2op_p(obj->num_comments, /*times*/sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
1724 obj->num_comments = 0;
1725 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1726 return false;
1727 }
1728 for (i = 0; i < obj->num_comments; i++) {
1729 /* Initialize here just to make sure. */
1730 obj->comments[i].length = 0;
1731 obj->comments[i].entry = 0;
1732
1733 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1734 if (length < 4) {
1735 obj->num_comments = i;
1736 goto skip;
1737 }
1738 else
1739 length -= 4;
1740 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length)) {
1741 obj->num_comments = i;
1742 return false; /* read_callback_ sets the state for us */
1743 }
1744 if (obj->comments[i].length > 0) {
1745 if (length < obj->comments[i].length) {
1746 obj->num_comments = i;
1747 FLAC__bitreader_limit_invalidate(decoder->private_->input);
1748 return false;
1749 }
1750 else
1751 length -= obj->comments[i].length;
1752 if (0 == (obj->comments[i].entry = safe_malloc_add_2op_(obj->comments[i].length, /*+*/1))) {
1753 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1754 obj->num_comments = i;
1755 return false;
1756 }
1757 memset (obj->comments[i].entry, 0, obj->comments[i].length) ;
1758 if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length)) {
1759 /* Current i-th entry is bad, so we delete it. */
1760 free (obj->comments[i].entry) ;
1761 obj->comments[i].entry = NULL ;
1762 obj->num_comments = i;
1763 goto skip;
1764 }
1765 obj->comments[i].entry[obj->comments[i].length] = '\0';
1766 }
1767 else
1768 obj->comments[i].entry = 0;
1769 }
1770 }
1771 }
1772 else {
1773 FLAC__bitreader_limit_invalidate(decoder->private_->input);
1774 return false;
1775 }
1776
1777 skip:
1778 if (length > 0) {
1779 /* length > 0 can only happen on files with invalid data in comments */
1780 if(obj->num_comments < 1) {
1781 free(obj->comments);
1782 obj->comments = NULL;
1783 }
1784 FLAC__bitreader_limit_invalidate(decoder->private_->input);
1785 return false;
1786 }
1787
1788 return true;
1789 }
1790
read_metadata_cuesheet_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_CueSheet * obj)1791 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj)
1792 {
1793 FLAC__uint32 i, j, x;
1794
1795 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1796
1797 memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet));
1798
1799 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1800 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->media_catalog_number, FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN/8))
1801 return false; /* read_callback_ sets the state for us */
1802
1803 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN))
1804 return false; /* read_callback_ sets the state for us */
1805
1806 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN))
1807 return false; /* read_callback_ sets the state for us */
1808 obj->is_cd = x? true : false;
1809
1810 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN))
1811 return false; /* read_callback_ sets the state for us */
1812
1813 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN))
1814 return false; /* read_callback_ sets the state for us */
1815 obj->num_tracks = x;
1816
1817 if(obj->num_tracks > 0) {
1818 if(0 == (obj->tracks = safe_calloc_(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) {
1819 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1820 return false;
1821 }
1822 for(i = 0; i < obj->num_tracks; i++) {
1823 FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i];
1824 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN))
1825 return false; /* read_callback_ sets the state for us */
1826
1827 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN))
1828 return false; /* read_callback_ sets the state for us */
1829 track->number = (FLAC__byte)x;
1830
1831 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1832 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8))
1833 return false; /* read_callback_ sets the state for us */
1834
1835 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN))
1836 return false; /* read_callback_ sets the state for us */
1837 track->type = x;
1838
1839 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN))
1840 return false; /* read_callback_ sets the state for us */
1841 track->pre_emphasis = x;
1842
1843 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN))
1844 return false; /* read_callback_ sets the state for us */
1845
1846 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN))
1847 return false; /* read_callback_ sets the state for us */
1848 track->num_indices = (FLAC__byte)x;
1849
1850 if(track->num_indices > 0) {
1851 if(0 == (track->indices = safe_calloc_(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) {
1852 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1853 return false;
1854 }
1855 for(j = 0; j < track->num_indices; j++) {
1856 FLAC__StreamMetadata_CueSheet_Index *indx = &track->indices[j];
1857 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &indx->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN))
1858 return false; /* read_callback_ sets the state for us */
1859
1860 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN))
1861 return false; /* read_callback_ sets the state for us */
1862 indx->number = (FLAC__byte)x;
1863
1864 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN))
1865 return false; /* read_callback_ sets the state for us */
1866 }
1867 }
1868 }
1869 }
1870
1871 return true;
1872 }
1873
read_metadata_picture_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_Picture * obj)1874 FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj)
1875 {
1876 FLAC__uint32 x;
1877
1878 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1879
1880 /* read type */
1881 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN))
1882 return false; /* read_callback_ sets the state for us */
1883 if(x < FLAC__STREAM_METADATA_PICTURE_TYPE_UNDEFINED)
1884 obj->type = x;
1885 else
1886 obj->type = FLAC__STREAM_METADATA_PICTURE_TYPE_OTHER;
1887
1888 /* read MIME type */
1889 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN))
1890 return false; /* read_callback_ sets the state for us */
1891 if(FLAC__bitreader_limit_remaining(decoder->private_->input) < x){
1892 FLAC__bitreader_limit_invalidate(decoder->private_->input);
1893 return false;
1894 }
1895 if(0 == (obj->mime_type = safe_malloc_add_2op_(x, /*+*/1))) {
1896 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1897 return false;
1898 }
1899 if(x > 0) {
1900 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x))
1901 return false; /* read_callback_ sets the state for us */
1902 }
1903 obj->mime_type[x] = '\0';
1904
1905 /* read description */
1906 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN))
1907 return false; /* read_callback_ sets the state for us */
1908 if(FLAC__bitreader_limit_remaining(decoder->private_->input) < x){
1909 FLAC__bitreader_limit_invalidate(decoder->private_->input);
1910 return false;
1911 }
1912 if(0 == (obj->description = safe_malloc_add_2op_(x, /*+*/1))) {
1913 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1914 return false;
1915 }
1916 if(x > 0) {
1917 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x))
1918 return false; /* read_callback_ sets the state for us */
1919 }
1920 obj->description[x] = '\0';
1921
1922 /* read width */
1923 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN))
1924 return false; /* read_callback_ sets the state for us */
1925
1926 /* read height */
1927 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN))
1928 return false; /* read_callback_ sets the state for us */
1929
1930 /* read depth */
1931 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN))
1932 return false; /* read_callback_ sets the state for us */
1933
1934 /* read colors */
1935 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN))
1936 return false; /* read_callback_ sets the state for us */
1937
1938 /* read data */
1939 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN))
1940 return false; /* read_callback_ sets the state for us */
1941 if(FLAC__bitreader_limit_remaining(decoder->private_->input) < obj->data_length){
1942 FLAC__bitreader_limit_invalidate(decoder->private_->input);
1943 return false;
1944 }
1945 if(0 == (obj->data = safe_malloc_(obj->data_length))) {
1946 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1947 return false;
1948 }
1949 if(obj->data_length > 0) {
1950 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length))
1951 return false; /* read_callback_ sets the state for us */
1952 }
1953
1954 return true;
1955 }
1956
skip_id3v2_tag_(FLAC__StreamDecoder * decoder)1957 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1958 {
1959 FLAC__uint32 x;
1960 uint32_t i, skip;
1961
1962 /* skip the version and flags bytes */
1963 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24))
1964 return false; /* read_callback_ sets the state for us */
1965 /* get the size (in bytes) to skip */
1966 skip = 0;
1967 for(i = 0; i < 4; i++) {
1968 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1969 return false; /* read_callback_ sets the state for us */
1970 skip <<= 7;
1971 skip |= (x & 0x7f);
1972 }
1973 /* skip the rest of the tag */
1974 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip))
1975 return false; /* read_callback_ sets the state for us */
1976 return true;
1977 }
1978
frame_sync_(FLAC__StreamDecoder * decoder)1979 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
1980 {
1981 FLAC__uint32 x;
1982 FLAC__bool first = true;
1983
1984 /* make sure we're byte aligned */
1985 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
1986 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
1987 return false; /* read_callback_ sets the state for us */
1988 }
1989
1990 while(1) {
1991 if(decoder->private_->cached) {
1992 x = (FLAC__uint32)decoder->private_->lookahead;
1993 decoder->private_->cached = false;
1994 }
1995 else {
1996 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1997 return false; /* read_callback_ sets the state for us */
1998 }
1999 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
2000 decoder->private_->header_warmup[0] = (FLAC__byte)x;
2001 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2002 return false; /* read_callback_ sets the state for us */
2003
2004 /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
2005 /* else we have to check if the second byte is the end of a sync code */
2006 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
2007 decoder->private_->lookahead = (FLAC__byte)x;
2008 decoder->private_->cached = true;
2009 }
2010 else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
2011 decoder->private_->header_warmup[1] = (FLAC__byte)x;
2012 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
2013
2014 /* Save location so we can rewind in case the frame turns
2015 * out to be invalid after the header */
2016 FLAC__bitreader_set_framesync_location(decoder->private_->input);
2017 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->last_seen_framesync))
2018 decoder->private_->last_seen_framesync = 0;
2019 return true;
2020 }
2021 }
2022 if(first) {
2023 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2024 first = false;
2025 }
2026 }
2027
2028 return true;
2029 }
2030
read_frame_(FLAC__StreamDecoder * decoder,FLAC__bool * got_a_frame,FLAC__bool do_full_decode)2031 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode)
2032 {
2033 uint32_t channel;
2034 uint32_t i;
2035 uint32_t frame_crc; /* the one we calculate from the input stream */
2036 FLAC__uint32 x;
2037
2038 *got_a_frame = false;
2039 decoder->private_->side_subframe_in_use = false;
2040
2041 /* init the CRC */
2042 frame_crc = 0;
2043 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
2044 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
2045 FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc);
2046
2047 if(!read_frame_header_(decoder))
2048 return false;
2049 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */
2050 return true;
2051 if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels, decoder->private_->frame.header.bits_per_sample))
2052 return false;
2053 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2054 /*
2055 * first figure the correct bits-per-sample of the subframe
2056 */
2057 uint32_t bps = decoder->private_->frame.header.bits_per_sample;
2058 switch(decoder->private_->frame.header.channel_assignment) {
2059 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2060 /* no adjustment needed */
2061 break;
2062 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2063 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2064 if(channel == 1)
2065 bps++;
2066 break;
2067 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2068 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2069 if(channel == 0)
2070 bps++;
2071 break;
2072 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2073 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2074 if(channel == 1)
2075 bps++;
2076 break;
2077 default:
2078 FLAC__ASSERT(0);
2079 }
2080 /*
2081 * now read it
2082 */
2083 if(!read_subframe_(decoder, channel, bps, do_full_decode)){
2084 /* read_callback_ sets the state for us */
2085 if(decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM)
2086 break;
2087 else
2088 return false;
2089 }
2090 }
2091
2092 if(decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM)
2093 if(!read_zero_padding_(decoder))
2094 return false;
2095
2096 /*
2097 * Read the frame CRC-16 from the footer and check
2098 */
2099 if(decoder->protected_->state == FLAC__STREAM_DECODER_READ_FRAME) {
2100 frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input);
2101 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN)) {
2102 /* read_callback_ sets the state for us */
2103 if(decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM)
2104 return false;
2105 }
2106 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
2107 }
2108 if(decoder->protected_->state == FLAC__STREAM_DECODER_READ_FRAME && frame_crc == x) {
2109 #endif
2110 if(do_full_decode) {
2111 /* Undo any special channel coding */
2112 undo_channel_coding(decoder);
2113 /* Check whether decoded data actually fits bps */
2114 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2115 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2116 int shift_bits = 32 - decoder->private_->frame.header.bits_per_sample;
2117 /* Check whether shift_bits MSBs are 'empty' by shifting up and down */
2118 if((decoder->private_->output[channel][i] < (INT32_MIN >> shift_bits)) ||
2119 (decoder->private_->output[channel][i] > (INT32_MAX >> shift_bits))) {
2120 /* Bad frame, emit error */
2121 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
2122 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2123 break;
2124 }
2125 }
2126 }
2127 }
2128 }
2129 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
2130 else if (decoder->protected_->state == FLAC__STREAM_DECODER_READ_FRAME) {
2131 /* Bad frame, emit error */
2132 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
2133 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2134 }
2135 #endif
2136
2137 /* Check whether frames are missing, if so, add silence to compensate */
2138 if(decoder->private_->last_frame_is_set && decoder->protected_->state == FLAC__STREAM_DECODER_READ_FRAME && !decoder->private_->is_seeking && do_full_decode) {
2139 FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2140 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2141 if(decoder->private_->last_frame.header.number.sample_number + decoder->private_->last_frame.header.blocksize < decoder->private_->frame.header.number.sample_number) {
2142 uint32_t padding_samples_needed = decoder->private_->frame.header.number.sample_number - (decoder->private_->last_frame.header.number.sample_number + decoder->private_->last_frame.header.blocksize);
2143
2144 /* Do some extra validation to assure last frame an current frame
2145 * header are both valid before adding silence inbetween
2146 * Technically both frames could be valid with differing sample_rates,
2147 * channels and bits_per_sample, but it is quite rare */
2148 if(decoder->private_->last_frame.header.sample_rate == decoder->private_->frame.header.sample_rate &&
2149 decoder->private_->last_frame.header.channels == decoder->private_->frame.header.channels &&
2150 decoder->private_->last_frame.header.bits_per_sample == decoder->private_->frame.header.bits_per_sample &&
2151 decoder->private_->last_frame.header.blocksize >= 16) {
2152
2153 FLAC__Frame empty_frame;
2154 empty_frame.header = decoder->private_->last_frame.header;
2155 empty_frame.footer.crc = 0;
2156 /* No repairs larger than 5 seconds or 50 frames are made, to not
2157 * unexpectedly create enormous files when one of the headers was
2158 * corrupt after all */
2159 if(padding_samples_needed > (5*empty_frame.header.sample_rate))
2160 padding_samples_needed = 5*empty_frame.header.sample_rate;
2161 if(padding_samples_needed > (50*empty_frame.header.blocksize))
2162 padding_samples_needed = 50*empty_frame.header.blocksize;
2163 while(padding_samples_needed){
2164 empty_frame.header.number.sample_number += empty_frame.header.blocksize;
2165 if(padding_samples_needed < empty_frame.header.blocksize)
2166 empty_frame.header.blocksize = padding_samples_needed;
2167 padding_samples_needed -= empty_frame.header.blocksize;
2168 decoder->protected_->blocksize = empty_frame.header.blocksize;
2169
2170 FLAC__ASSERT(empty_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2171 decoder->private_->samples_decoded = empty_frame.header.number.sample_number + empty_frame.header.blocksize;
2172
2173 if(!allocate_output_(decoder, empty_frame.header.blocksize, empty_frame.header.channels, empty_frame.header.bits_per_sample))
2174 return false;
2175
2176 for(channel = 0; channel < empty_frame.header.channels; channel++) {
2177 empty_frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
2178 empty_frame.subframes[channel].data.constant.value = 0;
2179 empty_frame.subframes[channel].wasted_bits = 0;
2180 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * empty_frame.header.blocksize);
2181 }
2182
2183 if(write_audio_frame_to_client_(decoder, &empty_frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE) {
2184 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2185 return false;
2186 }
2187 }
2188 }
2189 }
2190 }
2191
2192 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC || decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) {
2193 /* Got corruption, rewind if possible. Return value of seek
2194 * isn't checked, if the seek fails the decoder will continue anyway */
2195 if(!FLAC__bitreader_rewind_to_after_last_seen_framesync(decoder->private_->input)){
2196 #ifndef NDEBUG
2197 fprintf(stderr, "Rewinding, seeking necessary\n");
2198 #endif
2199 if(decoder->private_->seek_callback && decoder->private_->last_seen_framesync){
2200 /* Last framesync isn't in bitreader anymore, rewind with seek if possible */
2201 #ifndef NDEBUG
2202 FLAC__uint64 current_decode_position;
2203 if(FLAC__stream_decoder_get_decode_position(decoder, ¤t_decode_position))
2204 fprintf(stderr, "Bitreader was %" PRIu64 " bytes short\n", current_decode_position-decoder->private_->last_seen_framesync);
2205 #endif
2206 if(decoder->private_->seek_callback(decoder, decoder->private_->last_seen_framesync, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR) {
2207 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
2208 return false;
2209 }
2210 if(!FLAC__bitreader_clear(decoder->private_->input)) {
2211 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
2212 return false;
2213 }
2214 }
2215 }
2216 #ifndef NDEBUG
2217 else{
2218 fprintf(stderr, "Rewinding, seeking not necessary\n");
2219 }
2220 #endif
2221 }
2222 else {
2223 *got_a_frame = true;
2224
2225 /* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */
2226 if(decoder->private_->next_fixed_block_size)
2227 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size;
2228
2229 /* put the latest values into the public section of the decoder instance */
2230 decoder->protected_->channels = decoder->private_->frame.header.channels;
2231 decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
2232 decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
2233 decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
2234 decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
2235
2236 FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2237 decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
2238
2239 /* write it */
2240 if(do_full_decode) {
2241 if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE) {
2242 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2243 return false;
2244 }
2245 }
2246 }
2247
2248 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2249 return true;
2250 }
2251
read_frame_header_(FLAC__StreamDecoder * decoder)2252 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
2253 {
2254 FLAC__uint32 x;
2255 FLAC__uint64 xx;
2256 uint32_t i, blocksize_hint = 0, sample_rate_hint = 0;
2257 FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
2258 uint32_t raw_header_len;
2259 FLAC__bool is_unparseable = false;
2260
2261 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
2262
2263 /* init the raw header with the saved bits from synchronization */
2264 raw_header[0] = decoder->private_->header_warmup[0];
2265 raw_header[1] = decoder->private_->header_warmup[1];
2266 raw_header_len = 2;
2267
2268 /* check to make sure that reserved bit is 0 */
2269 if(raw_header[1] & 0x02) /* MAGIC NUMBER */
2270 is_unparseable = true;
2271
2272 /*
2273 * Note that along the way as we read the header, we look for a sync
2274 * code inside. If we find one it would indicate that our original
2275 * sync was bad since there cannot be a sync code in a valid header.
2276 *
2277 * Three kinds of things can go wrong when reading the frame header:
2278 * 1) We may have sync'ed incorrectly and not landed on a frame header.
2279 * If we don't find a sync code, it can end up looking like we read
2280 * a valid but unparseable header, until getting to the frame header
2281 * CRC. Even then we could get a false positive on the CRC.
2282 * 2) We may have sync'ed correctly but on an unparseable frame (from a
2283 * future encoder).
2284 * 3) We may be on a damaged frame which appears valid but unparseable.
2285 *
2286 * For all these reasons, we try and read a complete frame header as
2287 * long as it seems valid, even if unparseable, up until the frame
2288 * header CRC.
2289 */
2290
2291 /*
2292 * read in the raw header as bytes so we can CRC it, and parse it on the way
2293 */
2294 for(i = 0; i < 2; i++) {
2295 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2296 return false; /* read_callback_ sets the state for us */
2297 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
2298 /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
2299 decoder->private_->lookahead = (FLAC__byte)x;
2300 decoder->private_->cached = true;
2301 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2302 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2303 return true;
2304 }
2305 raw_header[raw_header_len++] = (FLAC__byte)x;
2306 }
2307
2308 switch(x = raw_header[2] >> 4) {
2309 case 0:
2310 is_unparseable = true;
2311 break;
2312 case 1:
2313 decoder->private_->frame.header.blocksize = 192;
2314 break;
2315 case 2:
2316 case 3:
2317 case 4:
2318 case 5:
2319 decoder->private_->frame.header.blocksize = 576 << (x-2);
2320 break;
2321 case 6:
2322 case 7:
2323 blocksize_hint = x;
2324 break;
2325 case 8:
2326 case 9:
2327 case 10:
2328 case 11:
2329 case 12:
2330 case 13:
2331 case 14:
2332 case 15:
2333 decoder->private_->frame.header.blocksize = 256 << (x-8);
2334 break;
2335 default:
2336 FLAC__ASSERT(0);
2337 break;
2338 }
2339
2340 switch(x = raw_header[2] & 0x0f) {
2341 case 0:
2342 if(decoder->private_->has_stream_info)
2343 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
2344 else
2345 is_unparseable = true;
2346 break;
2347 case 1:
2348 decoder->private_->frame.header.sample_rate = 88200;
2349 break;
2350 case 2:
2351 decoder->private_->frame.header.sample_rate = 176400;
2352 break;
2353 case 3:
2354 decoder->private_->frame.header.sample_rate = 192000;
2355 break;
2356 case 4:
2357 decoder->private_->frame.header.sample_rate = 8000;
2358 break;
2359 case 5:
2360 decoder->private_->frame.header.sample_rate = 16000;
2361 break;
2362 case 6:
2363 decoder->private_->frame.header.sample_rate = 22050;
2364 break;
2365 case 7:
2366 decoder->private_->frame.header.sample_rate = 24000;
2367 break;
2368 case 8:
2369 decoder->private_->frame.header.sample_rate = 32000;
2370 break;
2371 case 9:
2372 decoder->private_->frame.header.sample_rate = 44100;
2373 break;
2374 case 10:
2375 decoder->private_->frame.header.sample_rate = 48000;
2376 break;
2377 case 11:
2378 decoder->private_->frame.header.sample_rate = 96000;
2379 break;
2380 case 12:
2381 case 13:
2382 case 14:
2383 sample_rate_hint = x;
2384 break;
2385 case 15:
2386 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2387 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2388 return true;
2389 default:
2390 FLAC__ASSERT(0);
2391 }
2392
2393 x = (uint32_t)(raw_header[3] >> 4);
2394 if(x & 8) {
2395 decoder->private_->frame.header.channels = 2;
2396 switch(x & 7) {
2397 case 0:
2398 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
2399 break;
2400 case 1:
2401 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
2402 break;
2403 case 2:
2404 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
2405 break;
2406 default:
2407 is_unparseable = true;
2408 break;
2409 }
2410 }
2411 else {
2412 decoder->private_->frame.header.channels = (uint32_t)x + 1;
2413 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
2414 }
2415
2416 switch(x = (uint32_t)(raw_header[3] & 0x0e) >> 1) {
2417 case 0:
2418 if(decoder->private_->has_stream_info)
2419 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
2420 else
2421 is_unparseable = true;
2422 break;
2423 case 1:
2424 decoder->private_->frame.header.bits_per_sample = 8;
2425 break;
2426 case 2:
2427 decoder->private_->frame.header.bits_per_sample = 12;
2428 break;
2429 case 3:
2430 is_unparseable = true;
2431 break;
2432 case 4:
2433 decoder->private_->frame.header.bits_per_sample = 16;
2434 break;
2435 case 5:
2436 decoder->private_->frame.header.bits_per_sample = 20;
2437 break;
2438 case 6:
2439 decoder->private_->frame.header.bits_per_sample = 24;
2440 break;
2441 case 7:
2442 decoder->private_->frame.header.bits_per_sample = 32;
2443 break;
2444 default:
2445 FLAC__ASSERT(0);
2446 break;
2447 }
2448
2449 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
2450 /* check to make sure that reserved bit is 0 */
2451 if(raw_header[3] & 0x01) /* MAGIC NUMBER */
2452 is_unparseable = true;
2453 #endif
2454
2455 /* read the frame's starting sample number (or frame number as the case may be) */
2456 if(
2457 raw_header[1] & 0x01 ||
2458 /*@@@ this clause is a concession to the old way of doing variable blocksize; the only known implementation is flake and can probably be removed without inconveniencing anyone */
2459 (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize)
2460 ) { /* variable blocksize */
2461 if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len))
2462 return false; /* read_callback_ sets the state for us */
2463 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */
2464 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2465 decoder->private_->cached = true;
2466 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2467 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2468 return true;
2469 }
2470 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2471 decoder->private_->frame.header.number.sample_number = xx;
2472 }
2473 else { /* fixed blocksize */
2474 if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len))
2475 return false; /* read_callback_ sets the state for us */
2476 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
2477 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2478 decoder->private_->cached = true;
2479 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2480 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2481 return true;
2482 }
2483 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
2484 decoder->private_->frame.header.number.frame_number = x;
2485 }
2486
2487 if(blocksize_hint) {
2488 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2489 return false; /* read_callback_ sets the state for us */
2490 raw_header[raw_header_len++] = (FLAC__byte)x;
2491 if(blocksize_hint == 7) {
2492 FLAC__uint32 _x;
2493 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2494 return false; /* read_callback_ sets the state for us */
2495 raw_header[raw_header_len++] = (FLAC__byte)_x;
2496 x = (x << 8) | _x;
2497 }
2498 decoder->private_->frame.header.blocksize = x+1;
2499 }
2500
2501 if(sample_rate_hint) {
2502 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2503 return false; /* read_callback_ sets the state for us */
2504 raw_header[raw_header_len++] = (FLAC__byte)x;
2505 if(sample_rate_hint != 12) {
2506 FLAC__uint32 _x;
2507 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2508 return false; /* read_callback_ sets the state for us */
2509 raw_header[raw_header_len++] = (FLAC__byte)_x;
2510 x = (x << 8) | _x;
2511 }
2512 if(sample_rate_hint == 12)
2513 decoder->private_->frame.header.sample_rate = x*1000;
2514 else if(sample_rate_hint == 13)
2515 decoder->private_->frame.header.sample_rate = x;
2516 else
2517 decoder->private_->frame.header.sample_rate = x*10;
2518 }
2519
2520 /* read the CRC-8 byte */
2521 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2522 return false; /* read_callback_ sets the state for us */
2523 crc8 = (FLAC__byte)x;
2524
2525 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
2526 if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
2527 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2528 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2529 return true;
2530 }
2531 #endif
2532
2533 /* calculate the sample number from the frame number if needed */
2534 decoder->private_->next_fixed_block_size = 0;
2535 if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) {
2536 x = decoder->private_->frame.header.number.frame_number;
2537 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2538 if(decoder->private_->fixed_block_size)
2539 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x;
2540 else if(decoder->private_->has_stream_info) {
2541 if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) {
2542 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x;
2543 decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize;
2544 }
2545 else
2546 is_unparseable = true;
2547 }
2548 else if(x == 0) {
2549 decoder->private_->frame.header.number.sample_number = 0;
2550 decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize;
2551 }
2552 else {
2553 /* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */
2554 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x;
2555 }
2556 }
2557
2558 if(is_unparseable) {
2559 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2560 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2561 return true;
2562 }
2563
2564 return true;
2565 }
2566
read_subframe_(FLAC__StreamDecoder * decoder,uint32_t channel,uint32_t bps,FLAC__bool do_full_decode)2567 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2568 {
2569 FLAC__uint32 x;
2570 FLAC__bool wasted_bits;
2571 uint32_t i;
2572
2573 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */
2574 return false; /* read_callback_ sets the state for us */
2575
2576 wasted_bits = (x & 1);
2577 x &= 0xfe;
2578
2579 if(wasted_bits) {
2580 uint32_t u;
2581 if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u))
2582 return false; /* read_callback_ sets the state for us */
2583 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
2584 if (decoder->private_->frame.subframes[channel].wasted_bits >= bps) {
2585 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2586 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2587 return true;
2588 }
2589 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
2590 }
2591 else
2592 decoder->private_->frame.subframes[channel].wasted_bits = 0;
2593
2594 /*
2595 * Lots of magic numbers here
2596 */
2597 if(x & 0x80) {
2598 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2599 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2600 return true;
2601 }
2602 else if(x == 0) {
2603 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode))
2604 return false;
2605 }
2606 else if(x == 2) {
2607 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode))
2608 return false;
2609 }
2610 else if(x < 16) {
2611 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2612 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2613 return true;
2614 }
2615 else if(x <= 24) {
2616 uint32_t predictor_order = (x>>1)&7;
2617 if(decoder->private_->frame.header.blocksize <= predictor_order){
2618 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2619 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2620 return true;
2621 }
2622 if(!read_subframe_fixed_(decoder, channel, bps, predictor_order, do_full_decode))
2623 return false;
2624 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2625 return true;
2626 }
2627 else if(x < 64) {
2628 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2629 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2630 return true;
2631 }
2632 else {
2633 uint32_t predictor_order = ((x>>1)&31)+1;
2634 if(decoder->private_->frame.header.blocksize <= predictor_order){
2635 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2636 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2637 return true;
2638 }
2639 if(!read_subframe_lpc_(decoder, channel, bps, predictor_order, do_full_decode))
2640 return false;
2641 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2642 return true;
2643 }
2644
2645 if(wasted_bits && do_full_decode) {
2646 x = decoder->private_->frame.subframes[channel].wasted_bits;
2647 if((bps + x) < 33) {
2648 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2649 uint32_t val = decoder->private_->output[channel][i];
2650 decoder->private_->output[channel][i] = (val << x);
2651 }
2652 }
2653 else {
2654 /* When there are wasted bits, bps is never 33 and so
2655 * side_subframe is never already in use */
2656 FLAC__ASSERT(!decoder->private_->side_subframe_in_use);
2657 decoder->private_->side_subframe_in_use = true;
2658 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2659 uint64_t val = decoder->private_->output[channel][i];
2660 decoder->private_->side_subframe[i] = (val << x);
2661 }
2662 }
2663 }
2664
2665 return true;
2666 }
2667
read_subframe_constant_(FLAC__StreamDecoder * decoder,uint32_t channel,uint32_t bps,FLAC__bool do_full_decode)2668 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2669 {
2670 FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
2671 FLAC__int64 x;
2672 uint32_t i;
2673
2674 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
2675
2676 if(!FLAC__bitreader_read_raw_int64(decoder->private_->input, &x, bps))
2677 return false; /* read_callback_ sets the state for us */
2678
2679 subframe->value = x;
2680
2681 /* decode the subframe */
2682 if(do_full_decode) {
2683 if(bps <= 32) {
2684 FLAC__int32 *output = decoder->private_->output[channel];
2685 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2686 output[i] = x;
2687 } else {
2688 FLAC__int64 *output = decoder->private_->side_subframe;
2689 decoder->private_->side_subframe_in_use = true;
2690 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2691 output[i] = x;
2692 }
2693 }
2694
2695 return true;
2696 }
2697
read_subframe_fixed_(FLAC__StreamDecoder * decoder,uint32_t channel,uint32_t bps,const uint32_t order,FLAC__bool do_full_decode)2698 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode)
2699 {
2700 FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
2701 FLAC__int64 i64;
2702 FLAC__uint32 u32;
2703 uint32_t u;
2704
2705 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
2706
2707 subframe->residual = decoder->private_->residual[channel];
2708 subframe->order = order;
2709
2710 /* read warm-up samples */
2711 for(u = 0; u < order; u++) {
2712 if(!FLAC__bitreader_read_raw_int64(decoder->private_->input, &i64, bps))
2713 return false; /* read_callback_ sets the state for us */
2714 subframe->warmup[u] = i64;
2715 }
2716
2717 /* read entropy coding method info */
2718 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2719 return false; /* read_callback_ sets the state for us */
2720 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2721 switch(subframe->entropy_coding_method.type) {
2722 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2723 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2724 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2725 return false; /* read_callback_ sets the state for us */
2726 if((decoder->private_->frame.header.blocksize >> u32 < order) ||
2727 (decoder->private_->frame.header.blocksize % (1 << u32) > 0)) {
2728 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2729 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2730 return true;
2731 }
2732 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2733 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2734 break;
2735 default:
2736 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2737 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2738 return true;
2739 }
2740
2741 /* read residual */
2742 switch(subframe->entropy_coding_method.type) {
2743 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2744 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2745 if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
2746 return false;
2747 break;
2748 default:
2749 FLAC__ASSERT(0);
2750 }
2751
2752 /* decode the subframe */
2753 if(do_full_decode) {
2754 if(bps < 33){
2755 uint32_t i;
2756 for(i = 0; i < order; i++)
2757 decoder->private_->output[channel][i] = subframe->warmup[i];
2758 if(bps+order <= 32)
2759 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
2760 else
2761 FLAC__fixed_restore_signal_wide(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
2762 }
2763 else {
2764 decoder->private_->side_subframe_in_use = true;
2765 memcpy(decoder->private_->side_subframe, subframe->warmup, sizeof(FLAC__int64) * order);
2766 FLAC__fixed_restore_signal_wide_33bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->side_subframe+order);
2767 }
2768 }
2769
2770 return true;
2771 }
2772
read_subframe_lpc_(FLAC__StreamDecoder * decoder,uint32_t channel,uint32_t bps,const uint32_t order,FLAC__bool do_full_decode)2773 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode)
2774 {
2775 FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
2776 FLAC__int32 i32;
2777 FLAC__int64 i64;
2778 FLAC__uint32 u32;
2779 uint32_t u;
2780
2781 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
2782
2783 subframe->residual = decoder->private_->residual[channel];
2784 subframe->order = order;
2785
2786 /* read warm-up samples */
2787 for(u = 0; u < order; u++) {
2788 if(!FLAC__bitreader_read_raw_int64(decoder->private_->input, &i64, bps))
2789 return false; /* read_callback_ sets the state for us */
2790 subframe->warmup[u] = i64;
2791 }
2792
2793 /* read qlp coeff precision */
2794 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
2795 return false; /* read_callback_ sets the state for us */
2796 if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
2797 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2798 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2799 return true;
2800 }
2801 subframe->qlp_coeff_precision = u32+1;
2802
2803 /* read qlp shift */
2804 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
2805 return false; /* read_callback_ sets the state for us */
2806 if(i32 < 0) {
2807 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2808 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2809 return true;
2810 }
2811 subframe->quantization_level = i32;
2812
2813 /* read quantized lp coefficiencts */
2814 for(u = 0; u < order; u++) {
2815 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision))
2816 return false; /* read_callback_ sets the state for us */
2817 subframe->qlp_coeff[u] = i32;
2818 }
2819
2820 /* read entropy coding method info */
2821 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2822 return false; /* read_callback_ sets the state for us */
2823 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2824 switch(subframe->entropy_coding_method.type) {
2825 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2826 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2827 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2828 return false; /* read_callback_ sets the state for us */
2829 if((decoder->private_->frame.header.blocksize >> u32 < order) ||
2830 (decoder->private_->frame.header.blocksize % (1 << u32) > 0)) {
2831 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2832 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2833 return true;
2834 }
2835 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2836 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2837 break;
2838 default:
2839 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2840 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2841 return true;
2842 }
2843
2844 /* read residual */
2845 switch(subframe->entropy_coding_method.type) {
2846 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2847 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2848 if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
2849 return false;
2850 break;
2851 default:
2852 FLAC__ASSERT(0);
2853 }
2854
2855 /* decode the subframe */
2856 if(do_full_decode) {
2857 if(bps <= 32) {
2858 uint32_t i;
2859 for(i = 0; i < order; i++)
2860 decoder->private_->output[channel][i] = subframe->warmup[i];
2861 if(FLAC__lpc_max_residual_bps(bps, subframe->qlp_coeff, order, subframe->quantization_level) <= 32 &&
2862 FLAC__lpc_max_prediction_before_shift_bps(bps, subframe->qlp_coeff, order) <= 32)
2863 FLAC__lpc_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2864 else
2865 FLAC__lpc_restore_signal_wide(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2866 }
2867 else {
2868 decoder->private_->side_subframe_in_use = true;
2869 memcpy(decoder->private_->side_subframe, subframe->warmup, sizeof(FLAC__int64) * order);
2870 FLAC__lpc_restore_signal_wide_33bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->side_subframe+order);
2871 }
2872 }
2873
2874 return true;
2875 }
2876
read_subframe_verbatim_(FLAC__StreamDecoder * decoder,uint32_t channel,uint32_t bps,FLAC__bool do_full_decode)2877 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2878 {
2879 FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
2880 uint32_t i;
2881
2882 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
2883
2884 if(bps < 33) {
2885 FLAC__int32 x, *residual = decoder->private_->residual[channel];
2886
2887 subframe->data_type = FLAC__VERBATIM_SUBFRAME_DATA_TYPE_INT32;
2888 subframe->data.int32 = residual;
2889
2890 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2891 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2892 return false; /* read_callback_ sets the state for us */
2893 residual[i] = x;
2894 }
2895
2896 /* decode the subframe */
2897 if(do_full_decode)
2898 memcpy(decoder->private_->output[channel], subframe->data.int32, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2899 }
2900 else {
2901 FLAC__int64 x, *side = decoder->private_->side_subframe;
2902
2903 subframe->data_type = FLAC__VERBATIM_SUBFRAME_DATA_TYPE_INT64;
2904 subframe->data.int64 = side;
2905 decoder->private_->side_subframe_in_use = true;
2906
2907 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2908 if(!FLAC__bitreader_read_raw_int64(decoder->private_->input, &x, bps))
2909 return false; /* read_callback_ sets the state for us */
2910 side[i] = x;
2911 }
2912 }
2913
2914 return true;
2915 }
2916
read_residual_partitioned_rice_(FLAC__StreamDecoder * decoder,uint32_t predictor_order,uint32_t partition_order,FLAC__EntropyCodingMethod_PartitionedRiceContents * partitioned_rice_contents,FLAC__int32 * residual,FLAC__bool is_extended)2917 FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended)
2918 {
2919 FLAC__uint32 rice_parameter;
2920 int i;
2921 uint32_t partition, sample, u;
2922 const uint32_t partitions = 1u << partition_order;
2923 const uint32_t partition_samples = decoder->private_->frame.header.blocksize >> partition_order;
2924 const uint32_t plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2925 const uint32_t pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2926
2927 /* invalid predictor and partition orders mush be handled in the callers */
2928 FLAC__ASSERT(partition_order > 0? partition_samples >= predictor_order : decoder->private_->frame.header.blocksize >= predictor_order);
2929
2930 if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, flac_max(6u, partition_order))) {
2931 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
2932 return false;
2933 }
2934
2935 sample = 0;
2936 for(partition = 0; partition < partitions; partition++) {
2937 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen))
2938 return false; /* read_callback_ sets the state for us */
2939 partitioned_rice_contents->parameters[partition] = rice_parameter;
2940 if(rice_parameter < pesc) {
2941 partitioned_rice_contents->raw_bits[partition] = 0;
2942 u = (partition == 0) ? partition_samples - predictor_order : partition_samples;
2943 if(!FLAC__bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter)){
2944 if(decoder->protected_->state == FLAC__STREAM_DECODER_READ_FRAME) {
2945 /* no error was set, read_callback_ didn't set it, so
2946 * invalid rice symbol was found */
2947 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2948 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2949 return true;
2950 }
2951 else
2952 return false; /* read_callback_ sets the state for us */
2953 }
2954 sample += u;
2955 }
2956 else {
2957 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
2958 return false; /* read_callback_ sets the state for us */
2959 partitioned_rice_contents->raw_bits[partition] = rice_parameter;
2960 if(rice_parameter == 0) {
2961 for(u = (partition == 0)? predictor_order : 0; u < partition_samples; u++, sample++)
2962 residual[sample] = 0;
2963 }
2964 else{
2965 for(u = (partition == 0)? predictor_order : 0; u < partition_samples; u++, sample++) {
2966 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter))
2967 return false; /* read_callback_ sets the state for us */
2968 residual[sample] = i;
2969 }
2970 }
2971 }
2972 }
2973
2974 return true;
2975 }
2976
read_zero_padding_(FLAC__StreamDecoder * decoder)2977 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
2978 {
2979 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
2980 FLAC__uint32 zero = 0;
2981 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
2982 return false; /* read_callback_ sets the state for us */
2983 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
2984 if(zero != 0) {
2985 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2986 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2987 }
2988 #endif
2989 }
2990 return true;
2991 }
2992
read_callback_(FLAC__byte buffer[],size_t * bytes,void * client_data)2993 FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data)
2994 {
2995 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
2996
2997 if(
2998 #if FLAC__HAS_OGG
2999 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
3000 !decoder->private_->is_ogg &&
3001 #endif
3002 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
3003 ) {
3004 *bytes = 0;
3005 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
3006 return false;
3007 }
3008 else if(*bytes > 0) {
3009 /* While seeking, it is possible for our seek to land in the
3010 * middle of audio data that looks exactly like a frame header
3011 * from a future version of an encoder. When that happens, our
3012 * error callback will get an
3013 * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its
3014 * unparseable_frame_count. But there is a remote possibility
3015 * that it is properly synced at such a "future-codec frame",
3016 * so to make sure, we wait to see many "unparseable" errors in
3017 * a row before bailing out.
3018 */
3019 if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) {
3020 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
3021 return false;
3022 }
3023 else {
3024 const FLAC__StreamDecoderReadStatus status =
3025 #if FLAC__HAS_OGG
3026 decoder->private_->is_ogg?
3027 read_callback_ogg_aspect_(decoder, buffer, bytes) :
3028 #endif
3029 decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data)
3030 ;
3031 if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) {
3032 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
3033 return false;
3034 }
3035 else if(*bytes == 0) {
3036 if(
3037 status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM ||
3038 (
3039 #if FLAC__HAS_OGG
3040 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
3041 !decoder->private_->is_ogg &&
3042 #endif
3043 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
3044 )
3045 ) {
3046 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
3047 return false;
3048 }
3049 else
3050 return true;
3051 }
3052 else
3053 return true;
3054 }
3055 }
3056 else {
3057 /* abort to avoid a deadlock */
3058 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
3059 return false;
3060 }
3061 /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around
3062 * for Ogg FLAC. This is because the ogg decoder aspect can lose sync
3063 * and at the same time hit the end of the stream (for example, seeking
3064 * to a point that is after the beginning of the last Ogg page). There
3065 * is no way to report an Ogg sync loss through the callbacks (see note
3066 * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0.
3067 * So to keep the decoder from stopping at this point we gate the call
3068 * to the eof_callback and let the Ogg decoder aspect set the
3069 * end-of-stream state when it is needed.
3070 */
3071 }
3072
3073 #if defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION) && !defined(FUZZING_BUILD_MODE_FLAC_SANITIZE_SIGNED_INTEGER_OVERFLOW)
3074 /* The attribute below is to silence the undefined sanitizer of oss-fuzz.
3075 * Because fuzzing feeds bogus predictors and residual samples to the
3076 * decoder, having overflows in this section is unavoidable. Also,
3077 * because the calculated values are audio path only, there is no
3078 * potential for security problems */
3079 __attribute__((no_sanitize("signed-integer-overflow")))
3080 #endif
undo_channel_coding(FLAC__StreamDecoder * decoder)3081 void undo_channel_coding(FLAC__StreamDecoder *decoder) {
3082 uint32_t i;
3083 switch(decoder->private_->frame.header.channel_assignment) {
3084 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
3085 /* do nothing */
3086 break;
3087 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
3088 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
3089 FLAC__ASSERT(decoder->private_->side_subframe_in_use != /* logical XOR */ (decoder->private_->frame.header.bits_per_sample < 32));
3090 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
3091 if(decoder->private_->side_subframe_in_use)
3092 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->side_subframe[i];
3093 else
3094 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
3095 break;
3096 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
3097 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
3098 FLAC__ASSERT(decoder->private_->side_subframe_in_use != /* logical XOR */ (decoder->private_->frame.header.bits_per_sample < 32));
3099 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
3100 if(decoder->private_->side_subframe_in_use)
3101 decoder->private_->output[0][i] = decoder->private_->output[1][i] + decoder->private_->side_subframe[i];
3102 else
3103 decoder->private_->output[0][i] += decoder->private_->output[1][i];
3104 break;
3105 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
3106 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
3107 FLAC__ASSERT(decoder->private_->side_subframe_in_use != /* logical XOR */ (decoder->private_->frame.header.bits_per_sample < 32));
3108 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
3109 if(!decoder->private_->side_subframe_in_use){
3110 FLAC__int32 mid, side;
3111 mid = decoder->private_->output[0][i];
3112 side = decoder->private_->output[1][i];
3113 mid = ((uint32_t) mid) << 1;
3114 mid |= (side & 1); /* i.e. if 'side' is odd... */
3115 decoder->private_->output[0][i] = (mid + side) >> 1;
3116 decoder->private_->output[1][i] = (mid - side) >> 1;
3117 }
3118 else { /* bps == 32 */
3119 FLAC__int64 mid;
3120 mid = ((uint64_t)decoder->private_->output[0][i]) << 1;
3121 mid |= (decoder->private_->side_subframe[i] & 1); /* i.e. if 'side' is odd... */
3122 decoder->private_->output[0][i] = (mid + decoder->private_->side_subframe[i]) >> 1;
3123 decoder->private_->output[1][i] = (mid - decoder->private_->side_subframe[i]) >> 1;
3124 }
3125 }
3126 break;
3127 default:
3128 FLAC__ASSERT(0);
3129 break;
3130 }
3131 }
3132
3133 #if FLAC__HAS_OGG
read_callback_ogg_aspect_(const FLAC__StreamDecoder * decoder,FLAC__byte buffer[],size_t * bytes)3134 FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes)
3135 {
3136 switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) {
3137 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK:
3138 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
3139 /* we don't really have a way to handle lost sync via read
3140 * callback so we'll let it pass and let the underlying
3141 * FLAC decoder catch the error
3142 */
3143 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC:
3144 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
3145 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM:
3146 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
3147 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC:
3148 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION:
3149 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT:
3150 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR:
3151 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR:
3152 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
3153 default:
3154 FLAC__ASSERT(0);
3155 /* double protection */
3156 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
3157 }
3158 }
3159
read_callback_proxy_(const void * void_decoder,FLAC__byte buffer[],size_t * bytes,void * client_data)3160 FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
3161 {
3162 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder;
3163
3164 switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) {
3165 case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE:
3166 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK;
3167 case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM:
3168 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM;
3169 case FLAC__STREAM_DECODER_READ_STATUS_ABORT:
3170 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
3171 default:
3172 /* double protection: */
3173 FLAC__ASSERT(0);
3174 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
3175 }
3176 }
3177 #endif
3178
write_audio_frame_to_client_(FLAC__StreamDecoder * decoder,const FLAC__Frame * frame,const FLAC__int32 * const buffer[])3179 FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[])
3180 {
3181 decoder->private_->last_frame = *frame; /* save the frame */
3182 decoder->private_->last_frame_is_set = true;
3183 if(decoder->private_->is_seeking) {
3184 FLAC__uint64 this_frame_sample = frame->header.number.sample_number;
3185 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize;
3186 FLAC__uint64 target_sample = decoder->private_->target_sample;
3187
3188 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3189
3190 #if FLAC__HAS_OGG
3191 decoder->private_->got_a_frame = true;
3192 #endif
3193 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */
3194 uint32_t delta = (uint32_t)(target_sample - this_frame_sample);
3195 /* kick out of seek mode */
3196 decoder->private_->is_seeking = false;
3197 /* shift out the samples before target_sample */
3198 if(delta > 0) {
3199 uint32_t channel;
3200 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS];
3201 for(channel = 0; channel < frame->header.channels; channel++)
3202 newbuffer[channel] = buffer[channel] + delta;
3203 decoder->private_->last_frame.header.blocksize -= delta;
3204 decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta;
3205 /* write the relevant samples */
3206 return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data);
3207 }
3208 else {
3209 /* write the relevant samples */
3210 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
3211 }
3212 }
3213 else {
3214 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
3215 }
3216 }
3217 else {
3218 /*
3219 * If we never got STREAMINFO, turn off MD5 checking to save
3220 * cycles since we don't have a sum to compare to anyway
3221 */
3222 if(!decoder->private_->has_stream_info)
3223 decoder->private_->do_md5_checking = false;
3224 if(decoder->private_->do_md5_checking) {
3225 if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8))
3226 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
3227 }
3228 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
3229 }
3230 }
3231
send_error_to_client_(const FLAC__StreamDecoder * decoder,FLAC__StreamDecoderErrorStatus status)3232 void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status)
3233 {
3234 if(!decoder->private_->is_seeking)
3235 decoder->private_->error_callback(decoder, status, decoder->private_->client_data);
3236 else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM)
3237 decoder->private_->unparseable_frame_count++;
3238 }
3239
seek_to_absolute_sample_(FLAC__StreamDecoder * decoder,FLAC__uint64 stream_length,FLAC__uint64 target_sample)3240 FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
3241 {
3242 FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample;
3243 FLAC__int64 pos = -1;
3244 int i;
3245 uint32_t approx_bytes_per_frame;
3246 FLAC__bool first_seek = true, seek_from_lower_bound = false;
3247 const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder);
3248 const uint32_t min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
3249 const uint32_t max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize;
3250 const uint32_t max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize;
3251 const uint32_t min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize;
3252 /* take these from the current frame in case they've changed mid-stream */
3253 uint32_t channels = FLAC__stream_decoder_get_channels(decoder);
3254 uint32_t bps = FLAC__stream_decoder_get_bits_per_sample(decoder);
3255 const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0;
3256
3257 /* use values from stream info if we didn't decode a frame */
3258 if(channels == 0)
3259 channels = decoder->private_->stream_info.data.stream_info.channels;
3260 if(bps == 0)
3261 bps = decoder->private_->stream_info.data.stream_info.bits_per_sample;
3262
3263 /* we are just guessing here */
3264 if(max_framesize > 0)
3265 approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1;
3266 /*
3267 * Check if it's a known fixed-blocksize stream. Note that though
3268 * the spec doesn't allow zeroes in the STREAMINFO block, we may
3269 * never get a STREAMINFO block when decoding so the value of
3270 * min_blocksize might be zero.
3271 */
3272 else if(min_blocksize == max_blocksize && min_blocksize > 0) {
3273 /* note there are no () around 'bps/8' to keep precision up since it's an integer calculation */
3274 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
3275 }
3276 else
3277 approx_bytes_per_frame = 4096 * channels * bps/8 + 64;
3278
3279 /*
3280 * First, we set an upper and lower bound on where in the
3281 * stream we will search. For now we take the current position
3282 * as one bound and, depending on where the target position lies,
3283 * the beginning of the first frame or the end of the stream as
3284 * the other bound.
3285 */
3286 lower_bound = first_frame_offset;
3287 lower_bound_sample = 0;
3288 upper_bound = stream_length;
3289 upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/;
3290
3291 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC &&
3292 decoder->private_->samples_decoded != 0) {
3293 if(target_sample < decoder->private_->samples_decoded) {
3294 if(FLAC__stream_decoder_get_decode_position(decoder, &upper_bound))
3295 upper_bound_sample = decoder->private_->samples_decoded;
3296 } else {
3297 if(FLAC__stream_decoder_get_decode_position(decoder, &lower_bound))
3298 lower_bound_sample = decoder->private_->samples_decoded;
3299 }
3300 }
3301
3302 /*
3303 * Now we refine the bounds if we have a seektable with
3304 * suitable points. Note that according to the spec they
3305 * must be ordered by ascending sample number.
3306 *
3307 * Note: to protect against invalid seek tables we will ignore points
3308 * that have frame_samples==0 or sample_number>=total_samples. Also,
3309 * because math is limited to 64-bit ints, seekpoints with an offset
3310 * larger than 2^63 (8 exbibyte) are rejected.
3311 */
3312 if(seek_table) {
3313 FLAC__uint64 new_lower_bound = lower_bound;
3314 FLAC__uint64 new_upper_bound = upper_bound;
3315 FLAC__uint64 new_lower_bound_sample = lower_bound_sample;
3316 FLAC__uint64 new_upper_bound_sample = upper_bound_sample;
3317
3318 /* find the closest seek point <= target_sample, if it exists */
3319 for(i = (int)seek_table->num_points - 1; i >= 0; i--) {
3320 if(
3321 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3322 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3323 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3324 seek_table->points[i].sample_number <= target_sample
3325 )
3326 break;
3327 }
3328 if(i >= 0) { /* i.e. we found a suitable seek point... */
3329 new_lower_bound = first_frame_offset + seek_table->points[i].stream_offset;
3330 new_lower_bound_sample = seek_table->points[i].sample_number;
3331 }
3332
3333 /* find the closest seek point > target_sample, if it exists */
3334 for(i = 0; i < (int)seek_table->num_points; i++) {
3335 if(
3336 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3337 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3338 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3339 seek_table->points[i].sample_number > target_sample
3340 )
3341 break;
3342 }
3343 if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */
3344 new_upper_bound = first_frame_offset + seek_table->points[i].stream_offset;
3345 new_upper_bound_sample = seek_table->points[i].sample_number;
3346 }
3347 /* final protection against unsorted seek tables; keep original values if bogus */
3348 if(new_upper_bound >= new_lower_bound) {
3349 lower_bound = new_lower_bound;
3350 upper_bound = new_upper_bound;
3351 lower_bound_sample = new_lower_bound_sample;
3352 upper_bound_sample = new_upper_bound_sample;
3353 }
3354 }
3355
3356 FLAC__ASSERT(upper_bound_sample >= lower_bound_sample);
3357 /* there are 2 insidious ways that the following equality occurs, which
3358 * we need to fix:
3359 * 1) total_samples is 0 (unknown) and target_sample is 0
3360 * 2) total_samples is 0 (unknown) and target_sample happens to be
3361 * exactly equal to the last seek point in the seek table; this
3362 * means there is no seek point above it, and upper_bound_samples
3363 * remains equal to the estimate (of target_samples) we made above
3364 * in either case it does not hurt to move upper_bound_sample up by 1
3365 */
3366 if(upper_bound_sample == lower_bound_sample)
3367 upper_bound_sample++;
3368
3369 decoder->private_->target_sample = target_sample;
3370 while(1) {
3371 /* check whether decoder is still valid so bad state isn't overwritten
3372 * with seek error */
3373 if(decoder->protected_->state == FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR ||
3374 decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED)
3375 return false;
3376 /* check if the bounds are still ok */
3377 if (lower_bound_sample >= upper_bound_sample ||
3378 lower_bound > upper_bound ||
3379 upper_bound >= INT64_MAX) {
3380 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3381 return false;
3382 }
3383 if(seek_from_lower_bound) {
3384 pos = lower_bound;
3385 }
3386 else {
3387 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3388 pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)(target_sample - lower_bound_sample) / (double)(upper_bound_sample - lower_bound_sample) * (double)(upper_bound - lower_bound)) - approx_bytes_per_frame;
3389 #else
3390 /* a little less accurate: */
3391 if(upper_bound - lower_bound < 0xffffffff)
3392 pos = (FLAC__int64)lower_bound + (FLAC__int64)(((target_sample - lower_bound_sample) * (upper_bound - lower_bound)) / (upper_bound_sample - lower_bound_sample)) - approx_bytes_per_frame;
3393 else { /* @@@ WATCHOUT, ~2TB limit */
3394 FLAC__uint64 ratio = (1<<16) / (upper_bound_sample - lower_bound_sample);
3395 pos = (FLAC__int64)lower_bound + (FLAC__int64)((((target_sample - lower_bound_sample)>>8) * ((upper_bound - lower_bound)>>8) * ratio)) - approx_bytes_per_frame;
3396 }
3397 #endif
3398 }
3399 if(pos >= (FLAC__int64)upper_bound)
3400 pos = (FLAC__int64)upper_bound - 1;
3401 if(pos < (FLAC__int64)lower_bound)
3402 pos = (FLAC__int64)lower_bound;
3403 if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3404 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3405 return false;
3406 }
3407 if(!FLAC__stream_decoder_flush(decoder)) {
3408 /* above call sets the state for us */
3409 return false;
3410 }
3411 /* Now we need to get a frame. First we need to reset our
3412 * unparseable_frame_count; if we get too many unparseable
3413 * frames in a row, the read callback will return
3414 * FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing
3415 * FLAC__stream_decoder_process_single() to return false.
3416 */
3417 decoder->private_->unparseable_frame_count = 0;
3418 if(!FLAC__stream_decoder_process_single(decoder) || decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED || 0 == decoder->private_->samples_decoded) {
3419 /* No frame could be decoded */
3420 if(decoder->protected_->state != FLAC__STREAM_DECODER_ABORTED && decoder->private_->eof_callback(decoder, decoder->private_->client_data) && !seek_from_lower_bound){
3421 /* decoder has hit end of stream while processing corrupt
3422 * frame. To remedy this, try decoding a frame at the lower
3423 * bound so the seek after that hopefully ends up somewhere
3424 * else */
3425 seek_from_lower_bound = true;
3426 continue;
3427 }
3428 else {
3429 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3430 return false;
3431 }
3432 }
3433 seek_from_lower_bound = false;
3434
3435 /* our write callback will change the state when it gets to the target frame */
3436 /* actually, we could have got_a_frame if our decoder is at FLAC__STREAM_DECODER_END_OF_STREAM so we need to check for that also */
3437 if(!decoder->private_->is_seeking)
3438 break;
3439
3440 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3441 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3442
3443 if(this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek) {
3444 if (pos == (FLAC__int64)lower_bound) {
3445 /* can't move back any more than the first frame, something is fatally wrong */
3446 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3447 return false;
3448 }
3449 /* our last move backwards wasn't big enough, try again */
3450 approx_bytes_per_frame = (approx_bytes_per_frame > (upper_bound - lower_bound)) ? (upper_bound - lower_bound) : approx_bytes_per_frame ? approx_bytes_per_frame * 2 : 16;
3451 continue;
3452 }
3453 /* allow one seek over upper bound, so we can get a correct upper_bound_sample for streams with unknown total_samples */
3454 first_seek = false;
3455
3456 /* make sure we are not seeking in corrupted stream */
3457 if (this_frame_sample < lower_bound_sample) {
3458 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3459 return false;
3460 }
3461
3462 /* we need to narrow the search */
3463 if(target_sample < this_frame_sample) {
3464 upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3465 /*@@@@@@ what will decode position be if at end of stream? */
3466 if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) {
3467 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3468 return false;
3469 }
3470 approx_bytes_per_frame = (uint32_t)(2 * (upper_bound - pos) / 3 + 16);
3471 }
3472 else { /* target_sample >= this_frame_sample + this frame's blocksize */
3473 lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3474 if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) {
3475 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3476 return false;
3477 }
3478 approx_bytes_per_frame = (uint32_t)(2 * (lower_bound - pos) / 3 + 16);
3479 }
3480 }
3481
3482 return true;
3483 }
3484
3485 #if FLAC__HAS_OGG
seek_to_absolute_sample_ogg_(FLAC__StreamDecoder * decoder,FLAC__uint64 stream_length,FLAC__uint64 target_sample)3486 FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
3487 {
3488 FLAC__uint64 left_pos = 0, right_pos = stream_length;
3489 FLAC__uint64 left_sample = 0, right_sample = FLAC__stream_decoder_get_total_samples(decoder);
3490 FLAC__uint64 this_frame_sample = (FLAC__uint64)0 - 1;
3491 FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */
3492 FLAC__bool did_a_seek;
3493 uint32_t iteration = 0;
3494
3495 /* In the first iterations, we will calculate the target byte position
3496 * by the distance from the target sample to left_sample and
3497 * right_sample (let's call it "proportional search"). After that, we
3498 * will switch to binary search.
3499 */
3500 uint32_t BINARY_SEARCH_AFTER_ITERATION = 2;
3501
3502 /* We will switch to a linear search once our current sample is less
3503 * than this number of samples ahead of the target sample
3504 */
3505 static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2;
3506
3507 /* If the total number of samples is unknown, use a large value, and
3508 * force binary search immediately.
3509 */
3510 if(right_sample == 0) {
3511 right_sample = (FLAC__uint64)(-1);
3512 BINARY_SEARCH_AFTER_ITERATION = 0;
3513 }
3514
3515 decoder->private_->target_sample = target_sample;
3516 for( ; ; iteration++) {
3517 /* Do sanity checks on bounds */
3518 if(right_pos <= left_pos || right_pos - left_pos < 9) {
3519 /* FLAC frame is at least 9 byte in size */
3520 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3521 return false;
3522 }
3523 if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) {
3524 if (iteration >= BINARY_SEARCH_AFTER_ITERATION) {
3525 pos = (right_pos + left_pos) / 2;
3526 }
3527 else {
3528 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3529 pos = (FLAC__uint64)((double)(target_sample - left_sample) / (double)(right_sample - left_sample) * (double)(right_pos - left_pos));
3530 #else
3531 /* a little less accurate: */
3532 if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff))
3533 pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample));
3534 else /* @@@ WATCHOUT, ~2TB limit */
3535 pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16));
3536 #endif
3537 /* @@@ TODO: might want to limit pos to some distance
3538 * before EOF, to make sure we land before the last frame,
3539 * thereby getting a this_frame_sample and so having a better
3540 * estimate.
3541 */
3542 }
3543
3544 /* physical seek */
3545 if(decoder->private_->seek_callback((FLAC__StreamDecoder*)decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3546 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3547 return false;
3548 }
3549 if(!FLAC__stream_decoder_flush(decoder)) {
3550 /* above call sets the state for us */
3551 return false;
3552 }
3553 did_a_seek = true;
3554 }
3555 else
3556 did_a_seek = false;
3557
3558 decoder->private_->got_a_frame = false;
3559 if(!FLAC__stream_decoder_process_single(decoder) ||
3560 decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED) {
3561 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3562 return false;
3563 }
3564 if(!decoder->private_->got_a_frame) {
3565 if(did_a_seek) {
3566 /* this can happen if we seek to a point after the last frame; we drop
3567 * to binary search right away in this case to avoid any wasted
3568 * iterations of proportional search.
3569 */
3570 right_pos = pos;
3571 BINARY_SEARCH_AFTER_ITERATION = 0;
3572 }
3573 else {
3574 /* this can probably only happen if total_samples is unknown and the
3575 * target_sample is past the end of the stream
3576 */
3577 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3578 return false;
3579 }
3580 }
3581 /* our write callback will change the state when it gets to the target frame */
3582 else if(!decoder->private_->is_seeking) {
3583 break;
3584 }
3585 else {
3586 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3587 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3588
3589 if (did_a_seek) {
3590 if (this_frame_sample <= target_sample) {
3591 /* The 'equal' case should not happen, since
3592 * FLAC__stream_decoder_process_single()
3593 * should recognize that it has hit the
3594 * target sample and we would exit through
3595 * the 'break' above.
3596 */
3597 FLAC__ASSERT(this_frame_sample != target_sample);
3598
3599 left_sample = this_frame_sample;
3600 /* sanity check to avoid infinite loop */
3601 if (left_pos == pos) {
3602 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3603 return false;
3604 }
3605 left_pos = pos;
3606 }
3607 else {
3608 right_sample = this_frame_sample;
3609 /* sanity check to avoid infinite loop */
3610 if (right_pos == pos) {
3611 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3612 return false;
3613 }
3614 right_pos = pos;
3615 }
3616 }
3617 }
3618 }
3619
3620 return true;
3621 }
3622 #endif
3623
file_read_callback_(const FLAC__StreamDecoder * decoder,FLAC__byte buffer[],size_t * bytes,void * client_data)3624 FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
3625 {
3626 (void)client_data;
3627
3628 if(*bytes > 0) {
3629 *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, decoder->private_->file);
3630 if(ferror(decoder->private_->file))
3631 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
3632 else if(*bytes == 0)
3633 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
3634 else
3635 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
3636 }
3637 else
3638 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */
3639 }
3640
file_seek_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 absolute_byte_offset,void * client_data)3641 FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
3642 {
3643 (void)client_data;
3644
3645 if(decoder->private_->file == stdin)
3646 return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;
3647 else if(fseeko(decoder->private_->file, (FLAC__off_t)absolute_byte_offset, SEEK_SET) < 0)
3648 return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
3649 else
3650 return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
3651 }
3652
file_tell_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 * absolute_byte_offset,void * client_data)3653 FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
3654 {
3655 FLAC__off_t pos;
3656 (void)client_data;
3657
3658 if(decoder->private_->file == stdin)
3659 return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;
3660 else if((pos = ftello(decoder->private_->file)) < 0)
3661 return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
3662 else {
3663 *absolute_byte_offset = (FLAC__uint64)pos;
3664 return FLAC__STREAM_DECODER_TELL_STATUS_OK;
3665 }
3666 }
3667
file_length_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 * stream_length,void * client_data)3668 FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
3669 {
3670 struct flac_stat_s filestats;
3671 (void)client_data;
3672
3673 if(decoder->private_->file == stdin)
3674 return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;
3675
3676 #ifndef FLAC__USE_FILELENGTHI64
3677 if(flac_fstat(fileno(decoder->private_->file), &filestats) != 0)
3678 #else
3679 filestats.st_size = _filelengthi64(fileno(decoder->private_->file));
3680 if(filestats.st_size < 0)
3681 #endif
3682 return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
3683 else {
3684 *stream_length = (FLAC__uint64)filestats.st_size;
3685 return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
3686 }
3687 }
3688
file_eof_callback_(const FLAC__StreamDecoder * decoder,void * client_data)3689 FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data)
3690 {
3691 (void)client_data;
3692
3693 return feof(decoder->private_->file)? true : false;
3694 }
3695