1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007 Josh Coalson
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * - Neither the name of the Xiph.org Foundation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #if HAVE_CONFIG_H
33 # include <config.h>
34 #endif
35
36 #if defined _MSC_VER || defined __MINGW32__
37 #include <io.h> /* for _setmode() */
38 #include <fcntl.h> /* for _O_BINARY */
39 #endif
40 #if defined __CYGWIN__ || defined __EMX__
41 #include <io.h> /* for setmode(), O_BINARY */
42 #include <fcntl.h> /* for _O_BINARY */
43 #endif
44 #include <stdio.h>
45 #include <stdlib.h> /* for malloc() */
46 #include <string.h> /* for memset/memcpy() */
47 #include <sys/stat.h> /* for stat() */
48 #include <sys/types.h> /* for off_t */
49 #if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__
50 #if _MSC_VER <= 1600 || defined __BORLANDC__ /* @@@ [2G limit] */
51 #define fseeko fseek
52 #define ftello ftell
53 #endif
54 #endif
55 #include "FLAC/assert.h"
56 #include "share/alloc.h"
57 #include "protected/stream_decoder.h"
58 #include "private/bitreader.h"
59 #include "private/bitmath.h"
60 #include "private/cpu.h"
61 #include "private/crc.h"
62 #include "private/fixed.h"
63 #include "private/format.h"
64 #include "private/lpc.h"
65 #include "private/md5.h"
66 #include "private/memory.h"
67
68 #ifdef max
69 #undef max
70 #endif
71 #define max(a,b) ((a)>(b)?(a):(b))
72
73 /* adjust for compilers that can't understand using LLU suffix for uint64_t literals */
74 #ifdef _MSC_VER
75 #define FLAC__U64L(x) x
76 #else
77 #define FLAC__U64L(x) x##LLU
78 #endif
79
80
81 /* technically this should be in an "export.c" but this is convenient enough */
82 FLAC_API int FLAC_API_SUPPORTS_OGG_FLAC =
83 #if FLAC__HAS_OGG
84 1
85 #else
86 0
87 #endif
88 ;
89
90
91 /***********************************************************************
92 *
93 * Private static data
94 *
95 ***********************************************************************/
96
97 static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
98
99 /***********************************************************************
100 *
101 * Private class method prototypes
102 *
103 ***********************************************************************/
104
105 static void set_defaults_(FLAC__StreamDecoder *decoder);
106 static FILE *get_binary_stdin_(void);
107 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
108 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
109 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
110 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
111 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
112 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
113 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj);
114 static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
115 static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj);
116 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
117 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
118 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode);
119 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
120 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
121 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
122 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode);
123 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode);
124 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
125 static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended);
126 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
127 static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data);
128 #if FLAC__HAS_OGG
129 static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes);
130 static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
131 #endif
132 static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
133 static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status);
134 static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
135 #if FLAC__HAS_OGG
136 static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
137 #endif
138 static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
139 static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
140 static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
141 static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
142 static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data);
143
144 /***********************************************************************
145 *
146 * Private class data
147 *
148 ***********************************************************************/
149
150 typedef struct FLAC__StreamDecoderPrivate {
151 #if FLAC__HAS_OGG
152 FLAC__bool is_ogg;
153 #endif
154 FLAC__StreamDecoderReadCallback read_callback;
155 FLAC__StreamDecoderSeekCallback seek_callback;
156 FLAC__StreamDecoderTellCallback tell_callback;
157 FLAC__StreamDecoderLengthCallback length_callback;
158 FLAC__StreamDecoderEofCallback eof_callback;
159 FLAC__StreamDecoderWriteCallback write_callback;
160 FLAC__StreamDecoderMetadataCallback metadata_callback;
161 FLAC__StreamDecoderErrorCallback error_callback;
162 /* generic 32-bit datapath: */
163 void (*local_lpc_restore_signal)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
164 /* generic 64-bit datapath: */
165 void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
166 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */
167 void (*local_lpc_restore_signal_16bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
168 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit), AND order <= 8: */
169 void (*local_lpc_restore_signal_16bit_order8)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
170 FLAC__bool (*local_bitreader_read_rice_signed_block)(FLAC__BitReader *br, int vals[], unsigned nvals, unsigned parameter);
171 void *client_data;
172 FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */
173 FLAC__BitReader *input;
174 FLAC__int32 *output[FLAC__MAX_CHANNELS];
175 FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */
176 FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
177 unsigned output_capacity, output_channels;
178 FLAC__uint32 fixed_block_size, next_fixed_block_size;
179 FLAC__uint64 samples_decoded;
180 FLAC__bool has_stream_info, has_seek_table;
181 FLAC__StreamMetadata stream_info;
182 FLAC__StreamMetadata seek_table;
183 FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */
184 FLAC__byte *metadata_filter_ids;
185 size_t metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
186 FLAC__Frame frame;
187 FLAC__bool cached; /* true if there is a byte in lookahead */
188 FLAC__CPUInfo cpuinfo;
189 FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
190 FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
191 /* unaligned (original) pointers to allocated data */
192 FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS];
193 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 */
194 FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */
195 FLAC__bool is_seeking;
196 #ifndef FLAC__NO_MD5
197 FLAC__MD5Context md5context;
198 #endif
199 FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */
200 /* (the rest of these are only used for seeking) */
201 FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */
202 FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */
203 FLAC__uint64 target_sample;
204 unsigned unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */
205 #if FLAC__HAS_OGG
206 FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */
207 #endif
208 } FLAC__StreamDecoderPrivate;
209
210 /***********************************************************************
211 *
212 * Public static class data
213 *
214 ***********************************************************************/
215
216 FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
217 "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
218 "FLAC__STREAM_DECODER_READ_METADATA",
219 "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
220 "FLAC__STREAM_DECODER_READ_FRAME",
221 "FLAC__STREAM_DECODER_END_OF_STREAM",
222 "FLAC__STREAM_DECODER_OGG_ERROR",
223 "FLAC__STREAM_DECODER_SEEK_ERROR",
224 "FLAC__STREAM_DECODER_ABORTED",
225 "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
226 "FLAC__STREAM_DECODER_UNINITIALIZED"
227 };
228
229 FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = {
230 "FLAC__STREAM_DECODER_INIT_STATUS_OK",
231 "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER",
232 "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS",
233 "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR",
234 "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE",
235 "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED"
236 };
237
238 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
239 "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
240 "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
241 "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
242 };
243
244 FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = {
245 "FLAC__STREAM_DECODER_SEEK_STATUS_OK",
246 "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR",
247 "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED"
248 };
249
250 FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = {
251 "FLAC__STREAM_DECODER_TELL_STATUS_OK",
252 "FLAC__STREAM_DECODER_TELL_STATUS_ERROR",
253 "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED"
254 };
255
256 FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = {
257 "FLAC__STREAM_DECODER_LENGTH_STATUS_OK",
258 "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR",
259 "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED"
260 };
261
262 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
263 "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
264 "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
265 };
266
267 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
268 "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
269 "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
270 "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH",
271 "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM"
272 };
273
274 /***********************************************************************
275 *
276 * Class constructor/destructor
277 *
278 ***********************************************************************/
FLAC__stream_decoder_new(void)279 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void)
280 {
281 FLAC__StreamDecoder *decoder;
282 unsigned i;
283
284 FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
285
286 decoder = (FLAC__StreamDecoder*)calloc(1, sizeof(FLAC__StreamDecoder));
287 if(decoder == 0) {
288 return 0;
289 }
290
291 decoder->protected_ = (FLAC__StreamDecoderProtected*)calloc(1, sizeof(FLAC__StreamDecoderProtected));
292 if(decoder->protected_ == 0) {
293 free(decoder);
294 return 0;
295 }
296
297 decoder->private_ = (FLAC__StreamDecoderPrivate*)calloc(1, sizeof(FLAC__StreamDecoderPrivate));
298 if(decoder->private_ == 0) {
299 free(decoder->protected_);
300 free(decoder);
301 return 0;
302 }
303
304 decoder->private_->input = FLAC__bitreader_new();
305 if(decoder->private_->input == 0) {
306 free(decoder->private_);
307 free(decoder->protected_);
308 free(decoder);
309 return 0;
310 }
311
312 decoder->private_->metadata_filter_ids_capacity = 16;
313 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
314 FLAC__bitreader_delete(decoder->private_->input);
315 free(decoder->private_);
316 free(decoder->protected_);
317 free(decoder);
318 return 0;
319 }
320
321 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
322 decoder->private_->output[i] = 0;
323 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
324 }
325
326 decoder->private_->output_capacity = 0;
327 decoder->private_->output_channels = 0;
328 decoder->private_->has_seek_table = false;
329
330 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
331 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
332
333 decoder->private_->file = 0;
334
335 set_defaults_(decoder);
336
337 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
338
339 return decoder;
340 }
341
FLAC__stream_decoder_delete(FLAC__StreamDecoder * decoder)342 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
343 {
344 unsigned i;
345
346 FLAC__ASSERT(0 != decoder);
347 FLAC__ASSERT(0 != decoder->protected_);
348 FLAC__ASSERT(0 != decoder->private_);
349 FLAC__ASSERT(0 != decoder->private_->input);
350
351 (void)FLAC__stream_decoder_finish(decoder);
352
353 if(0 != decoder->private_->metadata_filter_ids)
354 free(decoder->private_->metadata_filter_ids);
355
356 FLAC__bitreader_delete(decoder->private_->input);
357
358 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
359 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
360
361 free(decoder->private_);
362 free(decoder->protected_);
363 free(decoder);
364 }
365
366 /***********************************************************************
367 *
368 * Public class methods
369 *
370 ***********************************************************************/
371
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)372 static FLAC__StreamDecoderInitStatus init_stream_internal_(
373 FLAC__StreamDecoder *decoder,
374 FLAC__StreamDecoderReadCallback read_callback,
375 FLAC__StreamDecoderSeekCallback seek_callback,
376 FLAC__StreamDecoderTellCallback tell_callback,
377 FLAC__StreamDecoderLengthCallback length_callback,
378 FLAC__StreamDecoderEofCallback eof_callback,
379 FLAC__StreamDecoderWriteCallback write_callback,
380 FLAC__StreamDecoderMetadataCallback metadata_callback,
381 FLAC__StreamDecoderErrorCallback error_callback,
382 void *client_data,
383 FLAC__bool is_ogg
384 )
385 {
386 FLAC__ASSERT(0 != decoder);
387
388 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
389 return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
390
391 #if !FLAC__HAS_OGG
392 if(is_ogg)
393 return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER;
394 #endif
395
396 if(
397 0 == read_callback ||
398 0 == write_callback ||
399 0 == error_callback ||
400 (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback))
401 )
402 return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
403
404 #if FLAC__HAS_OGG
405 decoder->private_->is_ogg = is_ogg;
406 if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect))
407 return decoder->protected_->state = FLAC__STREAM_DECODER_OGG_ERROR;
408 #endif
409
410 /*
411 * get the CPU info and set the function pointers
412 */
413 FLAC__cpu_info(&decoder->private_->cpuinfo);
414 /* first default to the non-asm routines */
415 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
416 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
417 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
418 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal;
419 decoder->private_->local_bitreader_read_rice_signed_block = FLAC__bitreader_read_rice_signed_block;
420 /* now override with asm where appropriate */
421 #ifndef FLAC__NO_ASM
422 if(decoder->private_->cpuinfo.use_asm) {
423 #ifdef FLAC__CPU_IA32
424 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
425 #ifdef FLAC__HAS_NASM
426 #if 1 /*@@@@@@ OPT: not clearly faster, needs more testing */
427 if(decoder->private_->cpuinfo.data.ia32.bswap)
428 decoder->private_->local_bitreader_read_rice_signed_block = FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap;
429 #endif
430 if(decoder->private_->cpuinfo.data.ia32.mmx) {
431 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
432 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
433 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ia32_mmx;
434 }
435 else {
436 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
437 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
438 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ia32;
439 }
440 #endif
441 #elif defined FLAC__CPU_PPC
442 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_PPC);
443 if(decoder->private_->cpuinfo.data.ppc.altivec) {
444 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ppc_altivec_16;
445 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ppc_altivec_16_order8;
446 }
447 #endif
448 }
449 #endif
450
451 /* from here on, errors are fatal */
452
453 if(!FLAC__bitreader_init(decoder->private_->input, decoder->private_->cpuinfo, read_callback_, decoder)) {
454 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
455 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
456 }
457
458 decoder->private_->read_callback = read_callback;
459 decoder->private_->seek_callback = seek_callback;
460 decoder->private_->tell_callback = tell_callback;
461 decoder->private_->length_callback = length_callback;
462 decoder->private_->eof_callback = eof_callback;
463 decoder->private_->write_callback = write_callback;
464 decoder->private_->metadata_callback = metadata_callback;
465 decoder->private_->error_callback = error_callback;
466 decoder->private_->client_data = client_data;
467 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
468 decoder->private_->samples_decoded = 0;
469 decoder->private_->has_stream_info = false;
470 decoder->private_->cached = false;
471
472 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
473 decoder->private_->is_seeking = false;
474
475 decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */
476 if(!FLAC__stream_decoder_reset(decoder)) {
477 /* above call sets the state for us */
478 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
479 }
480
481 return FLAC__STREAM_DECODER_INIT_STATUS_OK;
482 }
483
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)484 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream(
485 FLAC__StreamDecoder *decoder,
486 FLAC__StreamDecoderReadCallback read_callback,
487 FLAC__StreamDecoderSeekCallback seek_callback,
488 FLAC__StreamDecoderTellCallback tell_callback,
489 FLAC__StreamDecoderLengthCallback length_callback,
490 FLAC__StreamDecoderEofCallback eof_callback,
491 FLAC__StreamDecoderWriteCallback write_callback,
492 FLAC__StreamDecoderMetadataCallback metadata_callback,
493 FLAC__StreamDecoderErrorCallback error_callback,
494 void *client_data
495 )
496 {
497 return init_stream_internal_(
498 decoder,
499 read_callback,
500 seek_callback,
501 tell_callback,
502 length_callback,
503 eof_callback,
504 write_callback,
505 metadata_callback,
506 error_callback,
507 client_data,
508 /*is_ogg=*/false
509 );
510 }
511
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)512 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream(
513 FLAC__StreamDecoder *decoder,
514 FLAC__StreamDecoderReadCallback read_callback,
515 FLAC__StreamDecoderSeekCallback seek_callback,
516 FLAC__StreamDecoderTellCallback tell_callback,
517 FLAC__StreamDecoderLengthCallback length_callback,
518 FLAC__StreamDecoderEofCallback eof_callback,
519 FLAC__StreamDecoderWriteCallback write_callback,
520 FLAC__StreamDecoderMetadataCallback metadata_callback,
521 FLAC__StreamDecoderErrorCallback error_callback,
522 void *client_data
523 )
524 {
525 return init_stream_internal_(
526 decoder,
527 read_callback,
528 seek_callback,
529 tell_callback,
530 length_callback,
531 eof_callback,
532 write_callback,
533 metadata_callback,
534 error_callback,
535 client_data,
536 /*is_ogg=*/true
537 );
538 }
539
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)540 static FLAC__StreamDecoderInitStatus init_FILE_internal_(
541 FLAC__StreamDecoder *decoder,
542 FILE *file,
543 FLAC__StreamDecoderWriteCallback write_callback,
544 FLAC__StreamDecoderMetadataCallback metadata_callback,
545 FLAC__StreamDecoderErrorCallback error_callback,
546 void *client_data,
547 FLAC__bool is_ogg
548 )
549 {
550 FLAC__ASSERT(0 != decoder);
551 FLAC__ASSERT(0 != file);
552
553 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
554 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
555
556 if(0 == write_callback || 0 == error_callback)
557 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
558
559 /*
560 * To make sure that our file does not go unclosed after an error, we
561 * must assign the FILE pointer before any further error can occur in
562 * this routine.
563 */
564 if(file == stdin)
565 file = get_binary_stdin_(); /* just to be safe */
566
567 decoder->private_->file = file;
568
569 return init_stream_internal_(
570 decoder,
571 file_read_callback_,
572 decoder->private_->file == stdin? 0: file_seek_callback_,
573 decoder->private_->file == stdin? 0: file_tell_callback_,
574 decoder->private_->file == stdin? 0: file_length_callback_,
575 file_eof_callback_,
576 write_callback,
577 metadata_callback,
578 error_callback,
579 client_data,
580 is_ogg
581 );
582 }
583
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)584 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE(
585 FLAC__StreamDecoder *decoder,
586 FILE *file,
587 FLAC__StreamDecoderWriteCallback write_callback,
588 FLAC__StreamDecoderMetadataCallback metadata_callback,
589 FLAC__StreamDecoderErrorCallback error_callback,
590 void *client_data
591 )
592 {
593 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
594 }
595
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)596 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE(
597 FLAC__StreamDecoder *decoder,
598 FILE *file,
599 FLAC__StreamDecoderWriteCallback write_callback,
600 FLAC__StreamDecoderMetadataCallback metadata_callback,
601 FLAC__StreamDecoderErrorCallback error_callback,
602 void *client_data
603 )
604 {
605 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
606 }
607
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)608 static FLAC__StreamDecoderInitStatus init_file_internal_(
609 FLAC__StreamDecoder *decoder,
610 const char *filename,
611 FLAC__StreamDecoderWriteCallback write_callback,
612 FLAC__StreamDecoderMetadataCallback metadata_callback,
613 FLAC__StreamDecoderErrorCallback error_callback,
614 void *client_data,
615 FLAC__bool is_ogg
616 )
617 {
618 FILE *file;
619
620 FLAC__ASSERT(0 != decoder);
621
622 /*
623 * To make sure that our file does not go unclosed after an error, we
624 * have to do the same entrance checks here that are later performed
625 * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned.
626 */
627 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
628 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
629
630 if(0 == write_callback || 0 == error_callback)
631 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
632
633 file = filename? fopen(filename, "rb") : stdin;
634
635 if(0 == file)
636 return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
637
638 return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg);
639 }
640
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)641 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file(
642 FLAC__StreamDecoder *decoder,
643 const char *filename,
644 FLAC__StreamDecoderWriteCallback write_callback,
645 FLAC__StreamDecoderMetadataCallback metadata_callback,
646 FLAC__StreamDecoderErrorCallback error_callback,
647 void *client_data
648 )
649 {
650 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
651 }
652
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)653 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file(
654 FLAC__StreamDecoder *decoder,
655 const char *filename,
656 FLAC__StreamDecoderWriteCallback write_callback,
657 FLAC__StreamDecoderMetadataCallback metadata_callback,
658 FLAC__StreamDecoderErrorCallback error_callback,
659 void *client_data
660 )
661 {
662 return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
663 }
664
FLAC__stream_decoder_finish(FLAC__StreamDecoder * decoder)665 FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
666 {
667 FLAC__bool md5_failed = false;
668 unsigned i;
669
670 FLAC__ASSERT(0 != decoder);
671 FLAC__ASSERT(0 != decoder->private_);
672 FLAC__ASSERT(0 != decoder->protected_);
673
674 if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
675 return true;
676
677 #ifndef FLAC__NO_MD5
678 /* see the comment in FLAC__seekable_stream_decoder_reset() as to why we
679 * always call FLAC__MD5Final()
680 */
681 FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
682 #endif
683
684 if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) {
685 free(decoder->private_->seek_table.data.seek_table.points);
686 decoder->private_->seek_table.data.seek_table.points = 0;
687 decoder->private_->has_seek_table = false;
688 }
689 FLAC__bitreader_free(decoder->private_->input);
690 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
691 /* WATCHOUT:
692 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
693 * output arrays have a buffer of up to 3 zeroes in front
694 * (at negative indices) for alignment purposes; we use 4
695 * to keep the data well-aligned.
696 */
697 if(0 != decoder->private_->output[i]) {
698 free(decoder->private_->output[i]-4);
699 decoder->private_->output[i] = 0;
700 }
701 if(0 != decoder->private_->residual_unaligned[i]) {
702 free(decoder->private_->residual_unaligned[i]);
703 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
704 }
705 }
706 decoder->private_->output_capacity = 0;
707 decoder->private_->output_channels = 0;
708
709 #if FLAC__HAS_OGG
710 if(decoder->private_->is_ogg)
711 FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect);
712 #endif
713
714 if(0 != decoder->private_->file) {
715 if(decoder->private_->file != stdin)
716 fclose(decoder->private_->file);
717 decoder->private_->file = 0;
718 }
719
720 if(decoder->private_->do_md5_checking) {
721 if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16))
722 md5_failed = true;
723 }
724 decoder->private_->is_seeking = false;
725
726 set_defaults_(decoder);
727
728 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
729
730 return !md5_failed;
731 }
732
FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder * decoder,long value)733 FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value)
734 {
735 FLAC__ASSERT(0 != decoder);
736 FLAC__ASSERT(0 != decoder->private_);
737 FLAC__ASSERT(0 != decoder->protected_);
738 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
739 return false;
740 #if FLAC__HAS_OGG
741 /* can't check decoder->private_->is_ogg since that's not set until init time */
742 FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value);
743 return true;
744 #else
745 (void)value;
746 return false;
747 #endif
748 }
749
FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder * decoder,FLAC__bool value)750 FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value)
751 {
752 FLAC__ASSERT(0 != decoder);
753 FLAC__ASSERT(0 != decoder->protected_);
754 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
755 return false;
756 decoder->protected_->md5_checking = value;
757 return true;
758 }
759
FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder * decoder,FLAC__MetadataType type)760 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
761 {
762 FLAC__ASSERT(0 != decoder);
763 FLAC__ASSERT(0 != decoder->private_);
764 FLAC__ASSERT(0 != decoder->protected_);
765 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
766 /* double protection */
767 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
768 return false;
769 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
770 return false;
771 decoder->private_->metadata_filter[type] = true;
772 if(type == FLAC__METADATA_TYPE_APPLICATION)
773 decoder->private_->metadata_filter_ids_count = 0;
774 return true;
775 }
776
FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder * decoder,const FLAC__byte id[4])777 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
778 {
779 FLAC__ASSERT(0 != decoder);
780 FLAC__ASSERT(0 != decoder->private_);
781 FLAC__ASSERT(0 != decoder->protected_);
782 FLAC__ASSERT(0 != id);
783 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
784 return false;
785
786 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
787 return true;
788
789 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
790
791 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
792 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
793 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
794 return false;
795 }
796 decoder->private_->metadata_filter_ids_capacity *= 2;
797 }
798
799 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));
800 decoder->private_->metadata_filter_ids_count++;
801
802 return true;
803 }
804
FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder * decoder)805 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
806 {
807 unsigned i;
808 FLAC__ASSERT(0 != decoder);
809 FLAC__ASSERT(0 != decoder->private_);
810 FLAC__ASSERT(0 != decoder->protected_);
811 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
812 return false;
813 for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
814 decoder->private_->metadata_filter[i] = true;
815 decoder->private_->metadata_filter_ids_count = 0;
816 return true;
817 }
818
FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder * decoder,FLAC__MetadataType type)819 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
820 {
821 FLAC__ASSERT(0 != decoder);
822 FLAC__ASSERT(0 != decoder->private_);
823 FLAC__ASSERT(0 != decoder->protected_);
824 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
825 /* double protection */
826 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
827 return false;
828 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
829 return false;
830 decoder->private_->metadata_filter[type] = false;
831 if(type == FLAC__METADATA_TYPE_APPLICATION)
832 decoder->private_->metadata_filter_ids_count = 0;
833 return true;
834 }
835
FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder * decoder,const FLAC__byte id[4])836 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
837 {
838 FLAC__ASSERT(0 != decoder);
839 FLAC__ASSERT(0 != decoder->private_);
840 FLAC__ASSERT(0 != decoder->protected_);
841 FLAC__ASSERT(0 != id);
842 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
843 return false;
844
845 if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
846 return true;
847
848 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
849
850 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
851 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
852 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
853 return false;
854 }
855 decoder->private_->metadata_filter_ids_capacity *= 2;
856 }
857
858 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));
859 decoder->private_->metadata_filter_ids_count++;
860
861 return true;
862 }
863
FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder * decoder)864 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
865 {
866 FLAC__ASSERT(0 != decoder);
867 FLAC__ASSERT(0 != decoder->private_);
868 FLAC__ASSERT(0 != decoder->protected_);
869 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
870 return false;
871 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
872 decoder->private_->metadata_filter_ids_count = 0;
873 return true;
874 }
875
FLAC__stream_decoder_get_state(const FLAC__StreamDecoder * decoder)876 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
877 {
878 FLAC__ASSERT(0 != decoder);
879 FLAC__ASSERT(0 != decoder->protected_);
880 return decoder->protected_->state;
881 }
882
FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder * decoder)883 FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder)
884 {
885 return FLAC__StreamDecoderStateString[decoder->protected_->state];
886 }
887
FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder * decoder)888 FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder)
889 {
890 FLAC__ASSERT(0 != decoder);
891 FLAC__ASSERT(0 != decoder->protected_);
892 return decoder->protected_->md5_checking;
893 }
894
FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder * decoder)895 FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder)
896 {
897 FLAC__ASSERT(0 != decoder);
898 FLAC__ASSERT(0 != decoder->protected_);
899 return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0;
900 }
901
FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder * decoder)902 FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
903 {
904 FLAC__ASSERT(0 != decoder);
905 FLAC__ASSERT(0 != decoder->protected_);
906 return decoder->protected_->channels;
907 }
908
FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder * decoder)909 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
910 {
911 FLAC__ASSERT(0 != decoder);
912 FLAC__ASSERT(0 != decoder->protected_);
913 return decoder->protected_->channel_assignment;
914 }
915
FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder * decoder)916 FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
917 {
918 FLAC__ASSERT(0 != decoder);
919 FLAC__ASSERT(0 != decoder->protected_);
920 return decoder->protected_->bits_per_sample;
921 }
922
FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder * decoder)923 FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
924 {
925 FLAC__ASSERT(0 != decoder);
926 FLAC__ASSERT(0 != decoder->protected_);
927 return decoder->protected_->sample_rate;
928 }
929
FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder * decoder)930 FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
931 {
932 FLAC__ASSERT(0 != decoder);
933 FLAC__ASSERT(0 != decoder->protected_);
934 return decoder->protected_->blocksize;
935 }
936
FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder * decoder,FLAC__uint64 * position)937 FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position)
938 {
939 FLAC__ASSERT(0 != decoder);
940 FLAC__ASSERT(0 != decoder->private_);
941 FLAC__ASSERT(0 != position);
942
943 #if FLAC__HAS_OGG
944 if(decoder->private_->is_ogg)
945 return false;
946 #endif
947 if(0 == decoder->private_->tell_callback)
948 return false;
949 if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK)
950 return false;
951 /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */
952 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input))
953 return false;
954 FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder));
955 *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder);
956 return true;
957 }
958
FLAC__stream_decoder_flush(FLAC__StreamDecoder * decoder)959 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
960 {
961 FLAC__ASSERT(0 != decoder);
962 FLAC__ASSERT(0 != decoder->private_);
963 FLAC__ASSERT(0 != decoder->protected_);
964
965 decoder->private_->samples_decoded = 0;
966 decoder->private_->do_md5_checking = false;
967
968 #if FLAC__HAS_OGG
969 if(decoder->private_->is_ogg)
970 FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect);
971 #endif
972
973 if(!FLAC__bitreader_clear(decoder->private_->input)) {
974 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
975 return false;
976 }
977 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
978
979 return true;
980 }
981
FLAC__stream_decoder_reset(FLAC__StreamDecoder * decoder)982 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
983 {
984 FLAC__ASSERT(0 != decoder);
985 FLAC__ASSERT(0 != decoder->private_);
986 FLAC__ASSERT(0 != decoder->protected_);
987
988 if(!FLAC__stream_decoder_flush(decoder)) {
989 /* above call sets the state for us */
990 return false;
991 }
992
993 #if FLAC__HAS_OGG
994 /*@@@ could go in !internal_reset_hack block below */
995 if(decoder->private_->is_ogg)
996 FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect);
997 #endif
998
999 /* Rewind if necessary. If FLAC__stream_decoder_init() is calling us,
1000 * (internal_reset_hack) don't try to rewind since we are already at
1001 * the beginning of the stream and don't want to fail if the input is
1002 * not seekable.
1003 */
1004 if(!decoder->private_->internal_reset_hack) {
1005 if(decoder->private_->file == stdin)
1006 return false; /* can't rewind stdin, reset fails */
1007 if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR)
1008 return false; /* seekable and seek fails, reset fails */
1009 }
1010 else
1011 decoder->private_->internal_reset_hack = false;
1012
1013 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
1014
1015 decoder->private_->has_stream_info = false;
1016 if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) {
1017 free(decoder->private_->seek_table.data.seek_table.points);
1018 decoder->private_->seek_table.data.seek_table.points = 0;
1019 decoder->private_->has_seek_table = false;
1020 }
1021 decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
1022 /*
1023 * This goes in reset() and not flush() because according to the spec, a
1024 * fixed-blocksize stream must stay that way through the whole stream.
1025 */
1026 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
1027
1028 #ifndef FLAC__NO_MD5
1029 /* We initialize the FLAC__MD5Context even though we may never use it. This
1030 * is because md5 checking may be turned on to start and then turned off if
1031 * a seek occurs. So we init the context here and finalize it in
1032 * FLAC__stream_decoder_finish() to make sure things are always cleaned up
1033 * properly.
1034 */
1035 FLAC__MD5Init(&decoder->private_->md5context);
1036 #endif
1037
1038 decoder->private_->first_frame_offset = 0;
1039 decoder->private_->unparseable_frame_count = 0;
1040
1041 return true;
1042 }
1043
FLAC__stream_decoder_process_single(FLAC__StreamDecoder * decoder)1044 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
1045 {
1046 FLAC__bool got_a_frame;
1047 FLAC__ASSERT(0 != decoder);
1048 FLAC__ASSERT(0 != decoder->protected_);
1049
1050 while(1) {
1051 switch(decoder->protected_->state) {
1052 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1053 if(!find_metadata_(decoder))
1054 return false; /* above function sets the status for us */
1055 break;
1056 case FLAC__STREAM_DECODER_READ_METADATA:
1057 if(!read_metadata_(decoder))
1058 return false; /* above function sets the status for us */
1059 else
1060 return true;
1061 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1062 if(!frame_sync_(decoder))
1063 return true; /* above function sets the status for us */
1064 break;
1065 case FLAC__STREAM_DECODER_READ_FRAME:
1066 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true))
1067 return false; /* above function sets the status for us */
1068 if(got_a_frame)
1069 return true; /* above function sets the status for us */
1070 break;
1071 case FLAC__STREAM_DECODER_END_OF_STREAM:
1072 case FLAC__STREAM_DECODER_ABORTED:
1073 return true;
1074 default:
1075 FLAC__ASSERT(0);
1076 return false;
1077 }
1078 }
1079 }
1080
FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder * decoder)1081 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
1082 {
1083 FLAC__ASSERT(0 != decoder);
1084 FLAC__ASSERT(0 != decoder->protected_);
1085
1086 while(1) {
1087 switch(decoder->protected_->state) {
1088 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1089 if(!find_metadata_(decoder))
1090 return false; /* above function sets the status for us */
1091 break;
1092 case FLAC__STREAM_DECODER_READ_METADATA:
1093 if(!read_metadata_(decoder))
1094 return false; /* above function sets the status for us */
1095 break;
1096 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1097 case FLAC__STREAM_DECODER_READ_FRAME:
1098 case FLAC__STREAM_DECODER_END_OF_STREAM:
1099 case FLAC__STREAM_DECODER_ABORTED:
1100 return true;
1101 default:
1102 FLAC__ASSERT(0);
1103 return false;
1104 }
1105 }
1106 }
1107
FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder * decoder)1108 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
1109 {
1110 FLAC__bool dummy;
1111 FLAC__ASSERT(0 != decoder);
1112 FLAC__ASSERT(0 != decoder->protected_);
1113
1114 while(1) {
1115 switch(decoder->protected_->state) {
1116 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1117 if(!find_metadata_(decoder))
1118 return false; /* above function sets the status for us */
1119 break;
1120 case FLAC__STREAM_DECODER_READ_METADATA:
1121 if(!read_metadata_(decoder))
1122 return false; /* above function sets the status for us */
1123 break;
1124 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1125 if(!frame_sync_(decoder))
1126 return true; /* above function sets the status for us */
1127 break;
1128 case FLAC__STREAM_DECODER_READ_FRAME:
1129 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true))
1130 return false; /* above function sets the status for us */
1131 break;
1132 case FLAC__STREAM_DECODER_END_OF_STREAM:
1133 case FLAC__STREAM_DECODER_ABORTED:
1134 return true;
1135 default:
1136 FLAC__ASSERT(0);
1137 return false;
1138 }
1139 }
1140 }
1141
FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder * decoder)1142 FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder)
1143 {
1144 FLAC__bool got_a_frame;
1145 FLAC__ASSERT(0 != decoder);
1146 FLAC__ASSERT(0 != decoder->protected_);
1147
1148 while(1) {
1149 switch(decoder->protected_->state) {
1150 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1151 case FLAC__STREAM_DECODER_READ_METADATA:
1152 return false; /* above function sets the status for us */
1153 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1154 if(!frame_sync_(decoder))
1155 return true; /* above function sets the status for us */
1156 break;
1157 case FLAC__STREAM_DECODER_READ_FRAME:
1158 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false))
1159 return false; /* above function sets the status for us */
1160 if(got_a_frame)
1161 return true; /* above function sets the status for us */
1162 break;
1163 case FLAC__STREAM_DECODER_END_OF_STREAM:
1164 case FLAC__STREAM_DECODER_ABORTED:
1165 return true;
1166 default:
1167 FLAC__ASSERT(0);
1168 return false;
1169 }
1170 }
1171 }
1172
FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder * decoder,FLAC__uint64 sample)1173 FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample)
1174 {
1175 FLAC__uint64 length;
1176
1177 FLAC__ASSERT(0 != decoder);
1178
1179 if(
1180 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA &&
1181 decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA &&
1182 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC &&
1183 decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME &&
1184 decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM
1185 )
1186 return false;
1187
1188 if(0 == decoder->private_->seek_callback)
1189 return false;
1190
1191 FLAC__ASSERT(decoder->private_->seek_callback);
1192 FLAC__ASSERT(decoder->private_->tell_callback);
1193 FLAC__ASSERT(decoder->private_->length_callback);
1194 FLAC__ASSERT(decoder->private_->eof_callback);
1195
1196 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder))
1197 return false;
1198
1199 decoder->private_->is_seeking = true;
1200
1201 /* turn off md5 checking if a seek is attempted */
1202 decoder->private_->do_md5_checking = false;
1203
1204 /* 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) */
1205 if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) {
1206 decoder->private_->is_seeking = false;
1207 return false;
1208 }
1209
1210 /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */
1211 if(
1212 decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA ||
1213 decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA
1214 ) {
1215 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) {
1216 /* above call sets the state for us */
1217 decoder->private_->is_seeking = false;
1218 return false;
1219 }
1220 /* check this again in case we didn't know total_samples the first time */
1221 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) {
1222 decoder->private_->is_seeking = false;
1223 return false;
1224 }
1225 }
1226
1227 {
1228 const FLAC__bool ok =
1229 #if FLAC__HAS_OGG
1230 decoder->private_->is_ogg?
1231 seek_to_absolute_sample_ogg_(decoder, length, sample) :
1232 #endif
1233 seek_to_absolute_sample_(decoder, length, sample)
1234 ;
1235 decoder->private_->is_seeking = false;
1236 return ok;
1237 }
1238 }
1239
1240 /***********************************************************************
1241 *
1242 * Protected class methods
1243 *
1244 ***********************************************************************/
1245
FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder * decoder)1246 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
1247 {
1248 FLAC__ASSERT(0 != decoder);
1249 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1250 FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7));
1251 return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8;
1252 }
1253
1254 /***********************************************************************
1255 *
1256 * Private class methods
1257 *
1258 ***********************************************************************/
1259
set_defaults_(FLAC__StreamDecoder * decoder)1260 void set_defaults_(FLAC__StreamDecoder *decoder)
1261 {
1262 #if FLAC__HAS_OGG
1263 decoder->private_->is_ogg = false;
1264 #endif
1265 decoder->private_->read_callback = 0;
1266 decoder->private_->seek_callback = 0;
1267 decoder->private_->tell_callback = 0;
1268 decoder->private_->length_callback = 0;
1269 decoder->private_->eof_callback = 0;
1270 decoder->private_->write_callback = 0;
1271 decoder->private_->metadata_callback = 0;
1272 decoder->private_->error_callback = 0;
1273 decoder->private_->client_data = 0;
1274
1275 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
1276 decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
1277 decoder->private_->metadata_filter_ids_count = 0;
1278
1279 decoder->protected_->md5_checking = false;
1280
1281 #if FLAC__HAS_OGG
1282 FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect);
1283 #endif
1284 }
1285
1286 /*
1287 * This will forcibly set stdin to binary mode (for OSes that require it)
1288 */
get_binary_stdin_(void)1289 FILE *get_binary_stdin_(void)
1290 {
1291 /* if something breaks here it is probably due to the presence or
1292 * absence of an underscore before the identifiers 'setmode',
1293 * 'fileno', and/or 'O_BINARY'; check your system header files.
1294 */
1295 #if defined _MSC_VER || defined __MINGW32__
1296 _setmode(_fileno(stdin), _O_BINARY);
1297 #elif defined __CYGWIN__
1298 /* almost certainly not needed for any modern Cygwin, but let's be safe... */
1299 setmode(_fileno(stdin), _O_BINARY);
1300 #elif defined __EMX__
1301 setmode(fileno(stdin), O_BINARY);
1302 #endif
1303
1304 return stdin;
1305 }
1306
allocate_output_(FLAC__StreamDecoder * decoder,unsigned size,unsigned channels)1307 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
1308 {
1309 unsigned i;
1310 FLAC__int32 *tmp;
1311
1312 if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
1313 return true;
1314
1315 /* simply using realloc() is not practical because the number of channels may change mid-stream */
1316
1317 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
1318 if(0 != decoder->private_->output[i]) {
1319 free(decoder->private_->output[i]-4);
1320 decoder->private_->output[i] = 0;
1321 }
1322 if(0 != decoder->private_->residual_unaligned[i]) {
1323 free(decoder->private_->residual_unaligned[i]);
1324 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
1325 }
1326 }
1327
1328 for(i = 0; i < channels; i++) {
1329 /* WATCHOUT:
1330 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
1331 * output arrays have a buffer of up to 3 zeroes in front
1332 * (at negative indices) for alignment purposes; we use 4
1333 * to keep the data well-aligned.
1334 */
1335 tmp = (FLAC__int32*)safe_malloc_muladd2_(sizeof(FLAC__int32), /*times (*/size, /*+*/4/*)*/);
1336 if(tmp == 0) {
1337 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1338 return false;
1339 }
1340 memset(tmp, 0, sizeof(FLAC__int32)*4);
1341 decoder->private_->output[i] = tmp + 4;
1342
1343 /* WATCHOUT:
1344 * minimum of quadword alignment for PPC vector optimizations is REQUIRED:
1345 */
1346 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) {
1347 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1348 return false;
1349 }
1350 }
1351
1352 decoder->private_->output_capacity = size;
1353 decoder->private_->output_channels = channels;
1354
1355 return true;
1356 }
1357
has_id_filtered_(FLAC__StreamDecoder * decoder,FLAC__byte * id)1358 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
1359 {
1360 size_t i;
1361
1362 FLAC__ASSERT(0 != decoder);
1363 FLAC__ASSERT(0 != decoder->private_);
1364
1365 for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
1366 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
1367 return true;
1368
1369 return false;
1370 }
1371
find_metadata_(FLAC__StreamDecoder * decoder)1372 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
1373 {
1374 FLAC__uint32 x;
1375 unsigned i, id;
1376 FLAC__bool first = true;
1377
1378 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1379
1380 for(i = id = 0; i < 4; ) {
1381 if(decoder->private_->cached) {
1382 x = (FLAC__uint32)decoder->private_->lookahead;
1383 decoder->private_->cached = false;
1384 }
1385 else {
1386 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1387 return false; /* read_callback_ sets the state for us */
1388 }
1389 if(x == FLAC__STREAM_SYNC_STRING[i]) {
1390 first = true;
1391 i++;
1392 id = 0;
1393 continue;
1394 }
1395 if(x == ID3V2_TAG_[id]) {
1396 id++;
1397 i = 0;
1398 if(id == 3) {
1399 if(!skip_id3v2_tag_(decoder))
1400 return false; /* skip_id3v2_tag_ sets the state for us */
1401 }
1402 continue;
1403 }
1404 id = 0;
1405 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1406 decoder->private_->header_warmup[0] = (FLAC__byte)x;
1407 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1408 return false; /* read_callback_ sets the state for us */
1409
1410 /* 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 */
1411 /* else we have to check if the second byte is the end of a sync code */
1412 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1413 decoder->private_->lookahead = (FLAC__byte)x;
1414 decoder->private_->cached = true;
1415 }
1416 else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1417 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1418 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1419 return true;
1420 }
1421 }
1422 i = 0;
1423 if(first) {
1424 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
1425 first = false;
1426 }
1427 }
1428
1429 decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
1430 return true;
1431 }
1432
read_metadata_(FLAC__StreamDecoder * decoder)1433 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
1434 {
1435 FLAC__bool is_last;
1436 FLAC__uint32 i, x, type, length;
1437
1438 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1439
1440 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN))
1441 return false; /* read_callback_ sets the state for us */
1442 is_last = x? true : false;
1443
1444 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN))
1445 return false; /* read_callback_ sets the state for us */
1446
1447 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN))
1448 return false; /* read_callback_ sets the state for us */
1449
1450 if(type == FLAC__METADATA_TYPE_STREAMINFO) {
1451 if(!read_metadata_streaminfo_(decoder, is_last, length))
1452 return false;
1453
1454 decoder->private_->has_stream_info = true;
1455 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))
1456 decoder->private_->do_md5_checking = false;
1457 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback)
1458 decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
1459 }
1460 else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
1461 if(!read_metadata_seektable_(decoder, is_last, length))
1462 return false;
1463
1464 decoder->private_->has_seek_table = true;
1465 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback)
1466 decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
1467 }
1468 else {
1469 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
1470 unsigned real_length = length;
1471 FLAC__StreamMetadata block;
1472
1473 block.is_last = is_last;
1474 block.type = (FLAC__MetadataType)type;
1475 block.length = length;
1476
1477 if(type == FLAC__METADATA_TYPE_APPLICATION) {
1478 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))
1479 return false; /* read_callback_ sets the state for us */
1480
1481 if(real_length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) { /* underflow check */
1482 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;/*@@@@@@ maybe wrong error? need to resync?*/
1483 return false;
1484 }
1485
1486 real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
1487
1488 if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
1489 skip_it = !skip_it;
1490 }
1491
1492 if(skip_it) {
1493 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1494 return false; /* read_callback_ sets the state for us */
1495 }
1496 else {
1497 switch(type) {
1498 case FLAC__METADATA_TYPE_PADDING:
1499 /* skip the padding bytes */
1500 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1501 return false; /* read_callback_ sets the state for us */
1502 break;
1503 case FLAC__METADATA_TYPE_APPLICATION:
1504 /* remember, we read the ID already */
1505 if(real_length > 0) {
1506 if(0 == (block.data.application.data = (FLAC__byte*)malloc(real_length))) {
1507 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1508 return false;
1509 }
1510 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length))
1511 return false; /* read_callback_ sets the state for us */
1512 }
1513 else
1514 block.data.application.data = 0;
1515 break;
1516 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1517 if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment))
1518 return false;
1519 break;
1520 case FLAC__METADATA_TYPE_CUESHEET:
1521 if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet))
1522 return false;
1523 break;
1524 case FLAC__METADATA_TYPE_PICTURE:
1525 if(!read_metadata_picture_(decoder, &block.data.picture))
1526 return false;
1527 break;
1528 case FLAC__METADATA_TYPE_STREAMINFO:
1529 case FLAC__METADATA_TYPE_SEEKTABLE:
1530 FLAC__ASSERT(0);
1531 break;
1532 default:
1533 if(real_length > 0) {
1534 if(0 == (block.data.unknown.data = (FLAC__byte*)malloc(real_length))) {
1535 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1536 return false;
1537 }
1538 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length))
1539 return false; /* read_callback_ sets the state for us */
1540 }
1541 else
1542 block.data.unknown.data = 0;
1543 break;
1544 }
1545 if(!decoder->private_->is_seeking && decoder->private_->metadata_callback)
1546 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1547
1548 /* now we have to free any malloc()ed data in the block */
1549 switch(type) {
1550 case FLAC__METADATA_TYPE_PADDING:
1551 break;
1552 case FLAC__METADATA_TYPE_APPLICATION:
1553 if(0 != block.data.application.data)
1554 free(block.data.application.data);
1555 break;
1556 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1557 if(0 != block.data.vorbis_comment.vendor_string.entry)
1558 free(block.data.vorbis_comment.vendor_string.entry);
1559 if(block.data.vorbis_comment.num_comments > 0)
1560 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1561 if(0 != block.data.vorbis_comment.comments[i].entry)
1562 free(block.data.vorbis_comment.comments[i].entry);
1563 if(0 != block.data.vorbis_comment.comments)
1564 free(block.data.vorbis_comment.comments);
1565 break;
1566 case FLAC__METADATA_TYPE_CUESHEET:
1567 if(block.data.cue_sheet.num_tracks > 0)
1568 for(i = 0; i < block.data.cue_sheet.num_tracks; i++)
1569 if(0 != block.data.cue_sheet.tracks[i].indices)
1570 free(block.data.cue_sheet.tracks[i].indices);
1571 if(0 != block.data.cue_sheet.tracks)
1572 free(block.data.cue_sheet.tracks);
1573 break;
1574 case FLAC__METADATA_TYPE_PICTURE:
1575 if(0 != block.data.picture.mime_type)
1576 free(block.data.picture.mime_type);
1577 if(0 != block.data.picture.description)
1578 free(block.data.picture.description);
1579 if(0 != block.data.picture.data)
1580 free(block.data.picture.data);
1581 break;
1582 case FLAC__METADATA_TYPE_STREAMINFO:
1583 case FLAC__METADATA_TYPE_SEEKTABLE:
1584 FLAC__ASSERT(0);
1585 default:
1586 if(0 != block.data.unknown.data)
1587 free(block.data.unknown.data);
1588 break;
1589 }
1590 }
1591 }
1592
1593 if(is_last) {
1594 /* if this fails, it's OK, it's just a hint for the seek routine */
1595 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset))
1596 decoder->private_->first_frame_offset = 0;
1597 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1598 }
1599
1600 return true;
1601 }
1602
read_metadata_streaminfo_(FLAC__StreamDecoder * decoder,FLAC__bool is_last,unsigned length)1603 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1604 {
1605 FLAC__uint32 x;
1606 unsigned bits, used_bits = 0;
1607
1608 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1609
1610 decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
1611 decoder->private_->stream_info.is_last = is_last;
1612 decoder->private_->stream_info.length = length;
1613
1614 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
1615 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits))
1616 return false; /* read_callback_ sets the state for us */
1617 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
1618 used_bits += bits;
1619
1620 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
1621 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN))
1622 return false; /* read_callback_ sets the state for us */
1623 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
1624 used_bits += bits;
1625
1626 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
1627 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN))
1628 return false; /* read_callback_ sets the state for us */
1629 decoder->private_->stream_info.data.stream_info.min_framesize = x;
1630 used_bits += bits;
1631
1632 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
1633 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN))
1634 return false; /* read_callback_ sets the state for us */
1635 decoder->private_->stream_info.data.stream_info.max_framesize = x;
1636 used_bits += bits;
1637
1638 bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
1639 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN))
1640 return false; /* read_callback_ sets the state for us */
1641 decoder->private_->stream_info.data.stream_info.sample_rate = x;
1642 used_bits += bits;
1643
1644 bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
1645 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN))
1646 return false; /* read_callback_ sets the state for us */
1647 decoder->private_->stream_info.data.stream_info.channels = x+1;
1648 used_bits += bits;
1649
1650 bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
1651 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN))
1652 return false; /* read_callback_ sets the state for us */
1653 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
1654 used_bits += bits;
1655
1656 bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
1657 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))
1658 return false; /* read_callback_ sets the state for us */
1659 used_bits += bits;
1660
1661 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16))
1662 return false; /* read_callback_ sets the state for us */
1663 used_bits += 16*8;
1664
1665 /* skip the rest of the block */
1666 FLAC__ASSERT(used_bits % 8 == 0);
1667 length -= (used_bits / 8);
1668 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1669 return false; /* read_callback_ sets the state for us */
1670
1671 return true;
1672 }
1673
read_metadata_seektable_(FLAC__StreamDecoder * decoder,FLAC__bool is_last,unsigned length)1674 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1675 {
1676 FLAC__uint32 i, x;
1677 FLAC__uint64 xx;
1678
1679 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1680
1681 decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
1682 decoder->private_->seek_table.is_last = is_last;
1683 decoder->private_->seek_table.length = length;
1684
1685 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1686
1687 /* use realloc since we may pass through here several times (e.g. after seeking) */
1688 if(0 == (decoder->private_->seek_table.data.seek_table.points = (FLAC__StreamMetadata_SeekPoint*)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)))) {
1689 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1690 return false;
1691 }
1692 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
1693 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN))
1694 return false; /* read_callback_ sets the state for us */
1695 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
1696
1697 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN))
1698 return false; /* read_callback_ sets the state for us */
1699 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
1700
1701 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN))
1702 return false; /* read_callback_ sets the state for us */
1703 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
1704 }
1705 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
1706 /* if there is a partial point left, skip over it */
1707 if(length > 0) {
1708 /*@@@ do a send_error_to_client_() here? there's an argument for either way */
1709 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1710 return false; /* read_callback_ sets the state for us */
1711 }
1712
1713 return true;
1714 }
1715
read_metadata_vorbiscomment_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_VorbisComment * obj)1716 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj)
1717 {
1718 FLAC__uint32 i;
1719
1720 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1721
1722 /* read vendor string */
1723 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1724 if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length))
1725 return false; /* read_callback_ sets the state for us */
1726 if(obj->vendor_string.length > 0) {
1727 if(0 == (obj->vendor_string.entry = (FLAC__byte*)safe_malloc_add_2op_(obj->vendor_string.length, /*+*/1))) {
1728 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1729 return false;
1730 }
1731 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length))
1732 return false; /* read_callback_ sets the state for us */
1733 obj->vendor_string.entry[obj->vendor_string.length] = '\0';
1734 }
1735 else
1736 obj->vendor_string.entry = 0;
1737
1738 /* read num comments */
1739 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
1740 if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments))
1741 return false; /* read_callback_ sets the state for us */
1742
1743 /* read comments */
1744 if(obj->num_comments > 0) {
1745 if(0 == (obj->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)safe_malloc_mul_2op_(obj->num_comments, /*times*/sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
1746 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1747 return false;
1748 }
1749 for(i = 0; i < obj->num_comments; i++) {
1750 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1751 if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length))
1752 return false; /* read_callback_ sets the state for us */
1753 if(obj->comments[i].length > 0) {
1754 if(0 == (obj->comments[i].entry = (FLAC__byte*)safe_malloc_add_2op_(obj->comments[i].length, /*+*/1))) {
1755 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1756 return false;
1757 }
1758 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length))
1759 return false; /* read_callback_ sets the state for us */
1760 obj->comments[i].entry[obj->comments[i].length] = '\0';
1761 }
1762 else
1763 obj->comments[i].entry = 0;
1764 }
1765 }
1766 else {
1767 obj->comments = 0;
1768 }
1769
1770 return true;
1771 }
1772
read_metadata_cuesheet_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_CueSheet * obj)1773 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj)
1774 {
1775 FLAC__uint32 i, j, x;
1776
1777 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1778
1779 memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet));
1780
1781 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1782 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))
1783 return false; /* read_callback_ sets the state for us */
1784
1785 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN))
1786 return false; /* read_callback_ sets the state for us */
1787
1788 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN))
1789 return false; /* read_callback_ sets the state for us */
1790 obj->is_cd = x? true : false;
1791
1792 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN))
1793 return false; /* read_callback_ sets the state for us */
1794
1795 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN))
1796 return false; /* read_callback_ sets the state for us */
1797 obj->num_tracks = x;
1798
1799 if(obj->num_tracks > 0) {
1800 if(0 == (obj->tracks = (FLAC__StreamMetadata_CueSheet_Track*)safe_calloc_(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) {
1801 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1802 return false;
1803 }
1804 for(i = 0; i < obj->num_tracks; i++) {
1805 FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i];
1806 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN))
1807 return false; /* read_callback_ sets the state for us */
1808
1809 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN))
1810 return false; /* read_callback_ sets the state for us */
1811 track->number = (FLAC__byte)x;
1812
1813 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1814 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8))
1815 return false; /* read_callback_ sets the state for us */
1816
1817 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN))
1818 return false; /* read_callback_ sets the state for us */
1819 track->type = x;
1820
1821 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN))
1822 return false; /* read_callback_ sets the state for us */
1823 track->pre_emphasis = x;
1824
1825 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN))
1826 return false; /* read_callback_ sets the state for us */
1827
1828 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN))
1829 return false; /* read_callback_ sets the state for us */
1830 track->num_indices = (FLAC__byte)x;
1831
1832 if(track->num_indices > 0) {
1833 if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)safe_calloc_(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) {
1834 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1835 return false;
1836 }
1837 for(j = 0; j < track->num_indices; j++) {
1838 FLAC__StreamMetadata_CueSheet_Index *index = &track->indices[j];
1839 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &index->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN))
1840 return false; /* read_callback_ sets the state for us */
1841
1842 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN))
1843 return false; /* read_callback_ sets the state for us */
1844 index->number = (FLAC__byte)x;
1845
1846 if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN))
1847 return false; /* read_callback_ sets the state for us */
1848 }
1849 }
1850 }
1851 }
1852
1853 return true;
1854 }
1855
read_metadata_picture_(FLAC__StreamDecoder * decoder,FLAC__StreamMetadata_Picture * obj)1856 FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj)
1857 {
1858 FLAC__uint32 x;
1859
1860 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1861
1862 /* read type */
1863 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN))
1864 return false; /* read_callback_ sets the state for us */
1865 obj->type = x;
1866
1867 /* read MIME type */
1868 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN))
1869 return false; /* read_callback_ sets the state for us */
1870 if(0 == (obj->mime_type = (char*)safe_malloc_add_2op_(x, /*+*/1))) {
1871 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1872 return false;
1873 }
1874 if(x > 0) {
1875 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x))
1876 return false; /* read_callback_ sets the state for us */
1877 }
1878 obj->mime_type[x] = '\0';
1879
1880 /* read description */
1881 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN))
1882 return false; /* read_callback_ sets the state for us */
1883 if(0 == (obj->description = (FLAC__byte*)safe_malloc_add_2op_(x, /*+*/1))) {
1884 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1885 return false;
1886 }
1887 if(x > 0) {
1888 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x))
1889 return false; /* read_callback_ sets the state for us */
1890 }
1891 obj->description[x] = '\0';
1892
1893 /* read width */
1894 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN))
1895 return false; /* read_callback_ sets the state for us */
1896
1897 /* read height */
1898 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN))
1899 return false; /* read_callback_ sets the state for us */
1900
1901 /* read depth */
1902 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN))
1903 return false; /* read_callback_ sets the state for us */
1904
1905 /* read colors */
1906 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN))
1907 return false; /* read_callback_ sets the state for us */
1908
1909 /* read data */
1910 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN))
1911 return false; /* read_callback_ sets the state for us */
1912 if(0 == (obj->data = (FLAC__byte*)safe_malloc_(obj->data_length))) {
1913 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1914 return false;
1915 }
1916 if(obj->data_length > 0) {
1917 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length))
1918 return false; /* read_callback_ sets the state for us */
1919 }
1920
1921 return true;
1922 }
1923
skip_id3v2_tag_(FLAC__StreamDecoder * decoder)1924 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1925 {
1926 FLAC__uint32 x;
1927 unsigned i, skip;
1928
1929 /* skip the version and flags bytes */
1930 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24))
1931 return false; /* read_callback_ sets the state for us */
1932 /* get the size (in bytes) to skip */
1933 skip = 0;
1934 for(i = 0; i < 4; i++) {
1935 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1936 return false; /* read_callback_ sets the state for us */
1937 skip <<= 7;
1938 skip |= (x & 0x7f);
1939 }
1940 /* skip the rest of the tag */
1941 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip))
1942 return false; /* read_callback_ sets the state for us */
1943 return true;
1944 }
1945
frame_sync_(FLAC__StreamDecoder * decoder)1946 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
1947 {
1948 FLAC__uint32 x;
1949 FLAC__bool first = true;
1950
1951 /* If we know the total number of samples in the stream, stop if we've read that many. */
1952 /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1953 if(FLAC__stream_decoder_get_total_samples(decoder) > 0) {
1954 if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) {
1955 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1956 return true;
1957 }
1958 }
1959
1960 /* make sure we're byte aligned */
1961 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
1962 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
1963 return false; /* read_callback_ sets the state for us */
1964 }
1965
1966 while(1) {
1967 if(decoder->private_->cached) {
1968 x = (FLAC__uint32)decoder->private_->lookahead;
1969 decoder->private_->cached = false;
1970 }
1971 else {
1972 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1973 return false; /* read_callback_ sets the state for us */
1974 }
1975 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1976 decoder->private_->header_warmup[0] = (FLAC__byte)x;
1977 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1978 return false; /* read_callback_ sets the state for us */
1979
1980 /* 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 */
1981 /* else we have to check if the second byte is the end of a sync code */
1982 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1983 decoder->private_->lookahead = (FLAC__byte)x;
1984 decoder->private_->cached = true;
1985 }
1986 else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1987 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1988 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1989 return true;
1990 }
1991 }
1992 if(first) {
1993 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
1994 first = false;
1995 }
1996 }
1997
1998 return true;
1999 }
2000
read_frame_(FLAC__StreamDecoder * decoder,FLAC__bool * got_a_frame,FLAC__bool do_full_decode)2001 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode)
2002 {
2003 unsigned channel;
2004 unsigned i;
2005 FLAC__int32 mid, side;
2006 unsigned frame_crc; /* the one we calculate from the input stream */
2007 FLAC__uint32 x;
2008
2009 *got_a_frame = false;
2010
2011 /* init the CRC */
2012 frame_crc = 0;
2013 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
2014 frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
2015 FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc);
2016
2017 if(!read_frame_header_(decoder))
2018 return false;
2019 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */
2020 return true;
2021 if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
2022 return false;
2023 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2024 /*
2025 * first figure the correct bits-per-sample of the subframe
2026 */
2027 unsigned bps = decoder->private_->frame.header.bits_per_sample;
2028 switch(decoder->private_->frame.header.channel_assignment) {
2029 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2030 /* no adjustment needed */
2031 break;
2032 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2033 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2034 if(channel == 1)
2035 bps++;
2036 break;
2037 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2038 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2039 if(channel == 0)
2040 bps++;
2041 break;
2042 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2043 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2044 if(channel == 1)
2045 bps++;
2046 break;
2047 default:
2048 FLAC__ASSERT(0);
2049 }
2050 /*
2051 * now read it
2052 */
2053 if(!read_subframe_(decoder, channel, bps, do_full_decode))
2054 return false;
2055 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2056 return true;
2057 }
2058 if(!read_zero_padding_(decoder))
2059 return false;
2060 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption (i.e. "zero bits" were not all zeroes) */
2061 return true;
2062
2063 /*
2064 * Read the frame CRC-16 from the footer and check
2065 */
2066 frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input);
2067 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN))
2068 return false; /* read_callback_ sets the state for us */
2069 if(frame_crc == x) {
2070 if(do_full_decode) {
2071 /* Undo any special channel coding */
2072 switch(decoder->private_->frame.header.channel_assignment) {
2073 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2074 /* do nothing */
2075 break;
2076 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2077 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2078 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2079 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
2080 break;
2081 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2082 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2083 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2084 decoder->private_->output[0][i] += decoder->private_->output[1][i];
2085 break;
2086 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2087 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2088 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2089 #if 1
2090 mid = decoder->private_->output[0][i];
2091 side = decoder->private_->output[1][i];
2092 mid <<= 1;
2093 mid |= (side & 1); /* i.e. if 'side' is odd... */
2094 decoder->private_->output[0][i] = (mid + side) >> 1;
2095 decoder->private_->output[1][i] = (mid - side) >> 1;
2096 #else
2097 /* OPT: without 'side' temp variable */
2098 mid = (decoder->private_->output[0][i] << 1) | (decoder->private_->output[1][i] & 1); /* i.e. if 'side' is odd... */
2099 decoder->private_->output[0][i] = (mid + decoder->private_->output[1][i]) >> 1;
2100 decoder->private_->output[1][i] = (mid - decoder->private_->output[1][i]) >> 1;
2101 #endif
2102 }
2103 break;
2104 default:
2105 FLAC__ASSERT(0);
2106 break;
2107 }
2108 }
2109 }
2110 else {
2111 /* Bad frame, emit error and zero the output signal */
2112 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
2113 if(do_full_decode) {
2114 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2115 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2116 }
2117 }
2118 }
2119
2120 *got_a_frame = true;
2121
2122 /* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */
2123 if(decoder->private_->next_fixed_block_size)
2124 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size;
2125
2126 /* put the latest values into the public section of the decoder instance */
2127 decoder->protected_->channels = decoder->private_->frame.header.channels;
2128 decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
2129 decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
2130 decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
2131 decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
2132
2133 FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2134 decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
2135
2136 /* write it */
2137 if(do_full_decode) {
2138 if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE)
2139 return false;
2140 }
2141
2142 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2143 return true;
2144 }
2145
read_frame_header_(FLAC__StreamDecoder * decoder)2146 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
2147 {
2148 FLAC__uint32 x;
2149 FLAC__uint64 xx;
2150 unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
2151 FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
2152 unsigned raw_header_len;
2153 FLAC__bool is_unparseable = false;
2154
2155 FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
2156
2157 /* init the raw header with the saved bits from synchronization */
2158 raw_header[0] = decoder->private_->header_warmup[0];
2159 raw_header[1] = decoder->private_->header_warmup[1];
2160 raw_header_len = 2;
2161
2162 /* check to make sure that reserved bit is 0 */
2163 if(raw_header[1] & 0x02) /* MAGIC NUMBER */
2164 is_unparseable = true;
2165
2166 /*
2167 * Note that along the way as we read the header, we look for a sync
2168 * code inside. If we find one it would indicate that our original
2169 * sync was bad since there cannot be a sync code in a valid header.
2170 *
2171 * Three kinds of things can go wrong when reading the frame header:
2172 * 1) We may have sync'ed incorrectly and not landed on a frame header.
2173 * If we don't find a sync code, it can end up looking like we read
2174 * a valid but unparseable header, until getting to the frame header
2175 * CRC. Even then we could get a false positive on the CRC.
2176 * 2) We may have sync'ed correctly but on an unparseable frame (from a
2177 * future encoder).
2178 * 3) We may be on a damaged frame which appears valid but unparseable.
2179 *
2180 * For all these reasons, we try and read a complete frame header as
2181 * long as it seems valid, even if unparseable, up until the frame
2182 * header CRC.
2183 */
2184
2185 /*
2186 * read in the raw header as bytes so we can CRC it, and parse it on the way
2187 */
2188 for(i = 0; i < 2; i++) {
2189 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2190 return false; /* read_callback_ sets the state for us */
2191 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
2192 /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
2193 decoder->private_->lookahead = (FLAC__byte)x;
2194 decoder->private_->cached = true;
2195 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2196 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2197 return true;
2198 }
2199 raw_header[raw_header_len++] = (FLAC__byte)x;
2200 }
2201
2202 switch(x = raw_header[2] >> 4) {
2203 case 0:
2204 is_unparseable = true;
2205 break;
2206 case 1:
2207 decoder->private_->frame.header.blocksize = 192;
2208 break;
2209 case 2:
2210 case 3:
2211 case 4:
2212 case 5:
2213 decoder->private_->frame.header.blocksize = 576 << (x-2);
2214 break;
2215 case 6:
2216 case 7:
2217 blocksize_hint = x;
2218 break;
2219 case 8:
2220 case 9:
2221 case 10:
2222 case 11:
2223 case 12:
2224 case 13:
2225 case 14:
2226 case 15:
2227 decoder->private_->frame.header.blocksize = 256 << (x-8);
2228 break;
2229 default:
2230 FLAC__ASSERT(0);
2231 break;
2232 }
2233
2234 switch(x = raw_header[2] & 0x0f) {
2235 case 0:
2236 if(decoder->private_->has_stream_info)
2237 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
2238 else
2239 is_unparseable = true;
2240 break;
2241 case 1:
2242 decoder->private_->frame.header.sample_rate = 88200;
2243 break;
2244 case 2:
2245 decoder->private_->frame.header.sample_rate = 176400;
2246 break;
2247 case 3:
2248 decoder->private_->frame.header.sample_rate = 192000;
2249 break;
2250 case 4:
2251 decoder->private_->frame.header.sample_rate = 8000;
2252 break;
2253 case 5:
2254 decoder->private_->frame.header.sample_rate = 16000;
2255 break;
2256 case 6:
2257 decoder->private_->frame.header.sample_rate = 22050;
2258 break;
2259 case 7:
2260 decoder->private_->frame.header.sample_rate = 24000;
2261 break;
2262 case 8:
2263 decoder->private_->frame.header.sample_rate = 32000;
2264 break;
2265 case 9:
2266 decoder->private_->frame.header.sample_rate = 44100;
2267 break;
2268 case 10:
2269 decoder->private_->frame.header.sample_rate = 48000;
2270 break;
2271 case 11:
2272 decoder->private_->frame.header.sample_rate = 96000;
2273 break;
2274 case 12:
2275 case 13:
2276 case 14:
2277 sample_rate_hint = x;
2278 break;
2279 case 15:
2280 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2281 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2282 return true;
2283 default:
2284 FLAC__ASSERT(0);
2285 }
2286
2287 x = (unsigned)(raw_header[3] >> 4);
2288 if(x & 8) {
2289 decoder->private_->frame.header.channels = 2;
2290 switch(x & 7) {
2291 case 0:
2292 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
2293 break;
2294 case 1:
2295 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
2296 break;
2297 case 2:
2298 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
2299 break;
2300 default:
2301 is_unparseable = true;
2302 break;
2303 }
2304 }
2305 else {
2306 decoder->private_->frame.header.channels = (unsigned)x + 1;
2307 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
2308 }
2309
2310 switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
2311 case 0:
2312 if(decoder->private_->has_stream_info)
2313 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
2314 else
2315 is_unparseable = true;
2316 break;
2317 case 1:
2318 decoder->private_->frame.header.bits_per_sample = 8;
2319 break;
2320 case 2:
2321 decoder->private_->frame.header.bits_per_sample = 12;
2322 break;
2323 case 4:
2324 decoder->private_->frame.header.bits_per_sample = 16;
2325 break;
2326 case 5:
2327 decoder->private_->frame.header.bits_per_sample = 20;
2328 break;
2329 case 6:
2330 decoder->private_->frame.header.bits_per_sample = 24;
2331 break;
2332 case 3:
2333 case 7:
2334 is_unparseable = true;
2335 break;
2336 default:
2337 FLAC__ASSERT(0);
2338 break;
2339 }
2340
2341 /* check to make sure that reserved bit is 0 */
2342 if(raw_header[3] & 0x01) /* MAGIC NUMBER */
2343 is_unparseable = true;
2344
2345 /* read the frame's starting sample number (or frame number as the case may be) */
2346 if(
2347 raw_header[1] & 0x01 ||
2348 /*@@@ 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 */
2349 (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize)
2350 ) { /* variable blocksize */
2351 if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len))
2352 return false; /* read_callback_ sets the state for us */
2353 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */
2354 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2355 decoder->private_->cached = true;
2356 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2357 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2358 return true;
2359 }
2360 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2361 decoder->private_->frame.header.number.sample_number = xx;
2362 }
2363 else { /* fixed blocksize */
2364 if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len))
2365 return false; /* read_callback_ sets the state for us */
2366 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
2367 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2368 decoder->private_->cached = true;
2369 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2370 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2371 return true;
2372 }
2373 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
2374 decoder->private_->frame.header.number.frame_number = x;
2375 }
2376
2377 if(blocksize_hint) {
2378 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2379 return false; /* read_callback_ sets the state for us */
2380 raw_header[raw_header_len++] = (FLAC__byte)x;
2381 if(blocksize_hint == 7) {
2382 FLAC__uint32 _x;
2383 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2384 return false; /* read_callback_ sets the state for us */
2385 raw_header[raw_header_len++] = (FLAC__byte)_x;
2386 x = (x << 8) | _x;
2387 }
2388 decoder->private_->frame.header.blocksize = x+1;
2389 }
2390
2391 if(sample_rate_hint) {
2392 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2393 return false; /* read_callback_ sets the state for us */
2394 raw_header[raw_header_len++] = (FLAC__byte)x;
2395 if(sample_rate_hint != 12) {
2396 FLAC__uint32 _x;
2397 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2398 return false; /* read_callback_ sets the state for us */
2399 raw_header[raw_header_len++] = (FLAC__byte)_x;
2400 x = (x << 8) | _x;
2401 }
2402 if(sample_rate_hint == 12)
2403 decoder->private_->frame.header.sample_rate = x*1000;
2404 else if(sample_rate_hint == 13)
2405 decoder->private_->frame.header.sample_rate = x;
2406 else
2407 decoder->private_->frame.header.sample_rate = x*10;
2408 }
2409
2410 /* read the CRC-8 byte */
2411 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2412 return false; /* read_callback_ sets the state for us */
2413 crc8 = (FLAC__byte)x;
2414
2415 if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
2416 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2417 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2418 return true;
2419 }
2420
2421 /* calculate the sample number from the frame number if needed */
2422 decoder->private_->next_fixed_block_size = 0;
2423 if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) {
2424 x = decoder->private_->frame.header.number.frame_number;
2425 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2426 if(decoder->private_->fixed_block_size)
2427 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x;
2428 else if(decoder->private_->has_stream_info) {
2429 if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) {
2430 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x;
2431 decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize;
2432 }
2433 else
2434 is_unparseable = true;
2435 }
2436 else if(x == 0) {
2437 decoder->private_->frame.header.number.sample_number = 0;
2438 decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize;
2439 }
2440 else {
2441 /* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */
2442 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x;
2443 }
2444 }
2445
2446 if(is_unparseable) {
2447 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2448 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2449 return true;
2450 }
2451
2452 return true;
2453 }
2454
read_subframe_(FLAC__StreamDecoder * decoder,unsigned channel,unsigned bps,FLAC__bool do_full_decode)2455 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2456 {
2457 FLAC__uint32 x;
2458 FLAC__bool wasted_bits;
2459 unsigned i;
2460
2461 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */
2462 return false; /* read_callback_ sets the state for us */
2463
2464 wasted_bits = (x & 1);
2465 x &= 0xfe;
2466
2467 if(wasted_bits) {
2468 unsigned u;
2469 if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u))
2470 return false; /* read_callback_ sets the state for us */
2471 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
2472 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
2473 }
2474 else
2475 decoder->private_->frame.subframes[channel].wasted_bits = 0;
2476
2477 /*
2478 * Lots of magic numbers here
2479 */
2480 if(x & 0x80) {
2481 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2482 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2483 return true;
2484 }
2485 else if(x == 0) {
2486 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode))
2487 return false;
2488 }
2489 else if(x == 2) {
2490 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode))
2491 return false;
2492 }
2493 else if(x < 16) {
2494 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2495 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2496 return true;
2497 }
2498 else if(x <= 24) {
2499 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode))
2500 return false;
2501 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2502 return true;
2503 }
2504 else if(x < 64) {
2505 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2506 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2507 return true;
2508 }
2509 else {
2510 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode))
2511 return false;
2512 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2513 return true;
2514 }
2515
2516 if(wasted_bits && do_full_decode) {
2517 x = decoder->private_->frame.subframes[channel].wasted_bits;
2518 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2519 decoder->private_->output[channel][i] <<= x;
2520 }
2521
2522 return true;
2523 }
2524
read_subframe_constant_(FLAC__StreamDecoder * decoder,unsigned channel,unsigned bps,FLAC__bool do_full_decode)2525 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2526 {
2527 FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
2528 FLAC__int32 x;
2529 unsigned i;
2530 FLAC__int32 *output = decoder->private_->output[channel];
2531
2532 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
2533
2534 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2535 return false; /* read_callback_ sets the state for us */
2536
2537 subframe->value = x;
2538
2539 /* decode the subframe */
2540 if(do_full_decode) {
2541 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2542 output[i] = x;
2543 }
2544
2545 return true;
2546 }
2547
read_subframe_fixed_(FLAC__StreamDecoder * decoder,unsigned channel,unsigned bps,const unsigned order,FLAC__bool do_full_decode)2548 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode)
2549 {
2550 FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
2551 FLAC__int32 i32;
2552 FLAC__uint32 u32;
2553 unsigned u;
2554
2555 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
2556
2557 subframe->residual = decoder->private_->residual[channel];
2558 subframe->order = order;
2559
2560 /* read warm-up samples */
2561 for(u = 0; u < order; u++) {
2562 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2563 return false; /* read_callback_ sets the state for us */
2564 subframe->warmup[u] = i32;
2565 }
2566
2567 /* read entropy coding method info */
2568 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2569 return false; /* read_callback_ sets the state for us */
2570 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2571 switch(subframe->entropy_coding_method.type) {
2572 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2573 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2574 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2575 return false; /* read_callback_ sets the state for us */
2576 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2577 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2578 break;
2579 default:
2580 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2581 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2582 return true;
2583 }
2584
2585 /* read residual */
2586 switch(subframe->entropy_coding_method.type) {
2587 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2588 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2589 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))
2590 return false;
2591 break;
2592 default:
2593 FLAC__ASSERT(0);
2594 }
2595
2596 /* decode the subframe */
2597 if(do_full_decode) {
2598 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2599 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
2600 }
2601
2602 return true;
2603 }
2604
read_subframe_lpc_(FLAC__StreamDecoder * decoder,unsigned channel,unsigned bps,const unsigned order,FLAC__bool do_full_decode)2605 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode)
2606 {
2607 FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
2608 FLAC__int32 i32;
2609 FLAC__uint32 u32;
2610 unsigned u;
2611
2612 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
2613
2614 subframe->residual = decoder->private_->residual[channel];
2615 subframe->order = order;
2616
2617 /* read warm-up samples */
2618 for(u = 0; u < order; u++) {
2619 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2620 return false; /* read_callback_ sets the state for us */
2621 subframe->warmup[u] = i32;
2622 }
2623
2624 /* read qlp coeff precision */
2625 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
2626 return false; /* read_callback_ sets the state for us */
2627 if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
2628 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2629 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2630 return true;
2631 }
2632 subframe->qlp_coeff_precision = u32+1;
2633
2634 /* read qlp shift */
2635 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
2636 return false; /* read_callback_ sets the state for us */
2637 subframe->quantization_level = i32;
2638
2639 /* read quantized lp coefficiencts */
2640 for(u = 0; u < order; u++) {
2641 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision))
2642 return false; /* read_callback_ sets the state for us */
2643 subframe->qlp_coeff[u] = i32;
2644 }
2645
2646 /* read entropy coding method info */
2647 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2648 return false; /* read_callback_ sets the state for us */
2649 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2650 switch(subframe->entropy_coding_method.type) {
2651 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2652 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2653 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2654 return false; /* read_callback_ sets the state for us */
2655 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2656 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2657 break;
2658 default:
2659 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2660 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2661 return true;
2662 }
2663
2664 /* read residual */
2665 switch(subframe->entropy_coding_method.type) {
2666 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2667 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2668 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))
2669 return false;
2670 break;
2671 default:
2672 FLAC__ASSERT(0);
2673 }
2674
2675 /* decode the subframe */
2676 if(do_full_decode) {
2677 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2678 /*@@@@@@ technically not pessimistic enough, should be more like
2679 if( (FLAC__uint64)order * ((((FLAC__uint64)1)<<bps)-1) * ((1<<subframe->qlp_coeff_precision)-1) < (((FLAC__uint64)-1) << 32) )
2680 */
2681 if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
2682 if(bps <= 16 && subframe->qlp_coeff_precision <= 16) {
2683 if(order <= 8)
2684 decoder->private_->local_lpc_restore_signal_16bit_order8(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2685 else
2686 decoder->private_->local_lpc_restore_signal_16bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2687 }
2688 else
2689 decoder->private_->local_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);
2690 else
2691 decoder->private_->local_lpc_restore_signal_64bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2692 }
2693
2694 return true;
2695 }
2696
read_subframe_verbatim_(FLAC__StreamDecoder * decoder,unsigned channel,unsigned bps,FLAC__bool do_full_decode)2697 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2698 {
2699 FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
2700 FLAC__int32 x, *residual = decoder->private_->residual[channel];
2701 unsigned i;
2702
2703 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
2704
2705 subframe->data = residual;
2706
2707 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2708 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2709 return false; /* read_callback_ sets the state for us */
2710 residual[i] = x;
2711 }
2712
2713 /* decode the subframe */
2714 if(do_full_decode)
2715 memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2716
2717 return true;
2718 }
2719
read_residual_partitioned_rice_(FLAC__StreamDecoder * decoder,unsigned predictor_order,unsigned partition_order,FLAC__EntropyCodingMethod_PartitionedRiceContents * partitioned_rice_contents,FLAC__int32 * residual,FLAC__bool is_extended)2720 FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended)
2721 {
2722 FLAC__uint32 rice_parameter;
2723 int i;
2724 unsigned partition, sample, u;
2725 const unsigned partitions = 1u << partition_order;
2726 const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
2727 const unsigned plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2728 const unsigned pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2729
2730 /* sanity checks */
2731 if(partition_order == 0) {
2732 if(decoder->private_->frame.header.blocksize < predictor_order) {
2733 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2734 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2735 return true;
2736 }
2737 }
2738 else {
2739 if(partition_samples < predictor_order) {
2740 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2741 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2742 return true;
2743 }
2744 }
2745
2746 if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order))) {
2747 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
2748 return false;
2749 }
2750
2751 sample = 0;
2752 for(partition = 0; partition < partitions; partition++) {
2753 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen))
2754 return false; /* read_callback_ sets the state for us */
2755 partitioned_rice_contents->parameters[partition] = rice_parameter;
2756 if(rice_parameter < pesc) {
2757 partitioned_rice_contents->raw_bits[partition] = 0;
2758 u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
2759 if(!decoder->private_->local_bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter))
2760 return false; /* read_callback_ sets the state for us */
2761 sample += u;
2762 }
2763 else {
2764 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
2765 return false; /* read_callback_ sets the state for us */
2766 partitioned_rice_contents->raw_bits[partition] = rice_parameter;
2767 for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
2768 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter))
2769 return false; /* read_callback_ sets the state for us */
2770 residual[sample] = i;
2771 }
2772 }
2773 }
2774
2775 return true;
2776 }
2777
read_zero_padding_(FLAC__StreamDecoder * decoder)2778 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
2779 {
2780 if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
2781 FLAC__uint32 zero = 0;
2782 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
2783 return false; /* read_callback_ sets the state for us */
2784 if(zero != 0) {
2785 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2786 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2787 }
2788 }
2789 return true;
2790 }
2791
read_callback_(FLAC__byte buffer[],size_t * bytes,void * client_data)2792 FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data)
2793 {
2794 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
2795
2796 if(
2797 #if FLAC__HAS_OGG
2798 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2799 !decoder->private_->is_ogg &&
2800 #endif
2801 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2802 ) {
2803 *bytes = 0;
2804 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2805 return false;
2806 }
2807 else if(*bytes > 0) {
2808 /* While seeking, it is possible for our seek to land in the
2809 * middle of audio data that looks exactly like a frame header
2810 * from a future version of an encoder. When that happens, our
2811 * error callback will get an
2812 * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its
2813 * unparseable_frame_count. But there is a remote possibility
2814 * that it is properly synced at such a "future-codec frame",
2815 * so to make sure, we wait to see many "unparseable" errors in
2816 * a row before bailing out.
2817 */
2818 if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) {
2819 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2820 return false;
2821 }
2822 else {
2823 const FLAC__StreamDecoderReadStatus status =
2824 #if FLAC__HAS_OGG
2825 decoder->private_->is_ogg?
2826 read_callback_ogg_aspect_(decoder, buffer, bytes) :
2827 #endif
2828 decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data)
2829 ;
2830 if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) {
2831 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2832 return false;
2833 }
2834 else if(*bytes == 0) {
2835 if(
2836 status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM ||
2837 (
2838 #if FLAC__HAS_OGG
2839 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2840 !decoder->private_->is_ogg &&
2841 #endif
2842 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2843 )
2844 ) {
2845 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2846 return false;
2847 }
2848 else
2849 return true;
2850 }
2851 else
2852 return true;
2853 }
2854 }
2855 else {
2856 /* abort to avoid a deadlock */
2857 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2858 return false;
2859 }
2860 /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around
2861 * for Ogg FLAC. This is because the ogg decoder aspect can lose sync
2862 * and at the same time hit the end of the stream (for example, seeking
2863 * to a point that is after the beginning of the last Ogg page). There
2864 * is no way to report an Ogg sync loss through the callbacks (see note
2865 * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0.
2866 * So to keep the decoder from stopping at this point we gate the call
2867 * to the eof_callback and let the Ogg decoder aspect set the
2868 * end-of-stream state when it is needed.
2869 */
2870 }
2871
2872 #if FLAC__HAS_OGG
read_callback_ogg_aspect_(const FLAC__StreamDecoder * decoder,FLAC__byte buffer[],size_t * bytes)2873 FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes)
2874 {
2875 switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) {
2876 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK:
2877 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2878 /* we don't really have a way to handle lost sync via read
2879 * callback so we'll let it pass and let the underlying
2880 * FLAC decoder catch the error
2881 */
2882 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC:
2883 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2884 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM:
2885 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
2886 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC:
2887 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION:
2888 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT:
2889 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR:
2890 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR:
2891 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2892 default:
2893 FLAC__ASSERT(0);
2894 /* double protection */
2895 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2896 }
2897 }
2898
read_callback_proxy_(const void * void_decoder,FLAC__byte buffer[],size_t * bytes,void * client_data)2899 FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
2900 {
2901 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder;
2902
2903 switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) {
2904 case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE:
2905 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK;
2906 case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM:
2907 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM;
2908 case FLAC__STREAM_DECODER_READ_STATUS_ABORT:
2909 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2910 default:
2911 /* double protection: */
2912 FLAC__ASSERT(0);
2913 return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2914 }
2915 }
2916 #endif
2917
write_audio_frame_to_client_(FLAC__StreamDecoder * decoder,const FLAC__Frame * frame,const FLAC__int32 * const buffer[])2918 FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[])
2919 {
2920 if(decoder->private_->is_seeking) {
2921 FLAC__uint64 this_frame_sample = frame->header.number.sample_number;
2922 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize;
2923 FLAC__uint64 target_sample = decoder->private_->target_sample;
2924
2925 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2926
2927 #if FLAC__HAS_OGG
2928 decoder->private_->got_a_frame = true;
2929 #endif
2930 decoder->private_->last_frame = *frame; /* save the frame */
2931 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */
2932 unsigned delta = (unsigned)(target_sample - this_frame_sample);
2933 /* kick out of seek mode */
2934 decoder->private_->is_seeking = false;
2935 /* shift out the samples before target_sample */
2936 if(delta > 0) {
2937 unsigned channel;
2938 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS];
2939 for(channel = 0; channel < frame->header.channels; channel++)
2940 newbuffer[channel] = buffer[channel] + delta;
2941 decoder->private_->last_frame.header.blocksize -= delta;
2942 decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta;
2943 /* write the relevant samples */
2944 return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data);
2945 }
2946 else {
2947 /* write the relevant samples */
2948 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2949 }
2950 }
2951 else {
2952 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
2953 }
2954 }
2955 else {
2956 /*
2957 * If we never got STREAMINFO, turn off MD5 checking to save
2958 * cycles since we don't have a sum to compare to anyway
2959 */
2960 if(!decoder->private_->has_stream_info)
2961 decoder->private_->do_md5_checking = false;
2962 #ifndef FLAC__NO_MD5
2963 if(decoder->private_->do_md5_checking) {
2964 if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8))
2965 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
2966 }
2967 #endif
2968 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2969 }
2970 }
2971
send_error_to_client_(const FLAC__StreamDecoder * decoder,FLAC__StreamDecoderErrorStatus status)2972 void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status)
2973 {
2974 if(!decoder->private_->is_seeking)
2975 decoder->private_->error_callback(decoder, status, decoder->private_->client_data);
2976 else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM)
2977 decoder->private_->unparseable_frame_count++;
2978 }
2979
seek_to_absolute_sample_(FLAC__StreamDecoder * decoder,FLAC__uint64 stream_length,FLAC__uint64 target_sample)2980 FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
2981 {
2982 FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample;
2983 FLAC__int64 pos = -1;
2984 int i;
2985 unsigned approx_bytes_per_frame;
2986 FLAC__bool first_seek = true;
2987 const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder);
2988 const unsigned min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
2989 const unsigned max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize;
2990 const unsigned max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize;
2991 const unsigned min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize;
2992 /* take these from the current frame in case they've changed mid-stream */
2993 unsigned channels = FLAC__stream_decoder_get_channels(decoder);
2994 unsigned bps = FLAC__stream_decoder_get_bits_per_sample(decoder);
2995 const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0;
2996
2997 /* use values from stream info if we didn't decode a frame */
2998 if(channels == 0)
2999 channels = decoder->private_->stream_info.data.stream_info.channels;
3000 if(bps == 0)
3001 bps = decoder->private_->stream_info.data.stream_info.bits_per_sample;
3002
3003 /* we are just guessing here */
3004 if(max_framesize > 0)
3005 approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1;
3006 /*
3007 * Check if it's a known fixed-blocksize stream. Note that though
3008 * the spec doesn't allow zeroes in the STREAMINFO block, we may
3009 * never get a STREAMINFO block when decoding so the value of
3010 * min_blocksize might be zero.
3011 */
3012 else if(min_blocksize == max_blocksize && min_blocksize > 0) {
3013 /* note there are no () around 'bps/8' to keep precision up since it's an integer calulation */
3014 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
3015 }
3016 else
3017 approx_bytes_per_frame = 4096 * channels * bps/8 + 64;
3018
3019 /*
3020 * First, we set an upper and lower bound on where in the
3021 * stream we will search. For now we assume the worst case
3022 * scenario, which is our best guess at the beginning of
3023 * the first frame and end of the stream.
3024 */
3025 lower_bound = first_frame_offset;
3026 lower_bound_sample = 0;
3027 upper_bound = stream_length;
3028 upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/;
3029
3030 /*
3031 * Now we refine the bounds if we have a seektable with
3032 * suitable points. Note that according to the spec they
3033 * must be ordered by ascending sample number.
3034 *
3035 * Note: to protect against invalid seek tables we will ignore points
3036 * that have frame_samples==0 or sample_number>=total_samples
3037 */
3038 if(seek_table) {
3039 FLAC__uint64 new_lower_bound = lower_bound;
3040 FLAC__uint64 new_upper_bound = upper_bound;
3041 FLAC__uint64 new_lower_bound_sample = lower_bound_sample;
3042 FLAC__uint64 new_upper_bound_sample = upper_bound_sample;
3043
3044 /* find the closest seek point <= target_sample, if it exists */
3045 for(i = (int)seek_table->num_points - 1; i >= 0; i--) {
3046 if(
3047 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3048 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3049 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3050 seek_table->points[i].sample_number <= target_sample
3051 )
3052 break;
3053 }
3054 if(i >= 0) { /* i.e. we found a suitable seek point... */
3055 new_lower_bound = first_frame_offset + seek_table->points[i].stream_offset;
3056 new_lower_bound_sample = seek_table->points[i].sample_number;
3057 }
3058
3059 /* find the closest seek point > target_sample, if it exists */
3060 for(i = 0; i < (int)seek_table->num_points; i++) {
3061 if(
3062 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3063 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3064 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3065 seek_table->points[i].sample_number > target_sample
3066 )
3067 break;
3068 }
3069 if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */
3070 new_upper_bound = first_frame_offset + seek_table->points[i].stream_offset;
3071 new_upper_bound_sample = seek_table->points[i].sample_number;
3072 }
3073 /* final protection against unsorted seek tables; keep original values if bogus */
3074 if(new_upper_bound >= new_lower_bound) {
3075 lower_bound = new_lower_bound;
3076 upper_bound = new_upper_bound;
3077 lower_bound_sample = new_lower_bound_sample;
3078 upper_bound_sample = new_upper_bound_sample;
3079 }
3080 }
3081
3082 FLAC__ASSERT(upper_bound_sample >= lower_bound_sample);
3083 /* there are 2 insidious ways that the following equality occurs, which
3084 * we need to fix:
3085 * 1) total_samples is 0 (unknown) and target_sample is 0
3086 * 2) total_samples is 0 (unknown) and target_sample happens to be
3087 * exactly equal to the last seek point in the seek table; this
3088 * means there is no seek point above it, and upper_bound_samples
3089 * remains equal to the estimate (of target_samples) we made above
3090 * in either case it does not hurt to move upper_bound_sample up by 1
3091 */
3092 if(upper_bound_sample == lower_bound_sample)
3093 upper_bound_sample++;
3094
3095 decoder->private_->target_sample = target_sample;
3096 while(1) {
3097 /* check if the bounds are still ok */
3098 if (lower_bound_sample >= upper_bound_sample || lower_bound > upper_bound) {
3099 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3100 return false;
3101 }
3102 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3103 #if defined _MSC_VER || defined __MINGW32__
3104 /* with VC++ you have to spoon feed it the casting */
3105 pos = (FLAC__int64)lower_bound + (FLAC__int64)((FLAC__double)(FLAC__int64)(target_sample - lower_bound_sample) / (FLAC__double)(FLAC__int64)(upper_bound_sample - lower_bound_sample) * (FLAC__double)(FLAC__int64)(upper_bound - lower_bound)) - approx_bytes_per_frame;
3106 #else
3107 pos = (FLAC__int64)lower_bound + (FLAC__int64)((FLAC__double)(target_sample - lower_bound_sample) / (FLAC__double)(upper_bound_sample - lower_bound_sample) * (FLAC__double)(upper_bound - lower_bound)) - approx_bytes_per_frame;
3108 #endif
3109 #else
3110 /* a little less accurate: */
3111 if(upper_bound - lower_bound < 0xffffffff)
3112 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;
3113 else /* @@@ WATCHOUT, ~2TB limit */
3114 pos = (FLAC__int64)lower_bound + (FLAC__int64)((((target_sample - lower_bound_sample)>>8) * ((upper_bound - lower_bound)>>8)) / ((upper_bound_sample - lower_bound_sample)>>16)) - approx_bytes_per_frame;
3115 #endif
3116 if(pos >= (FLAC__int64)upper_bound)
3117 pos = (FLAC__int64)upper_bound - 1;
3118 if(pos < (FLAC__int64)lower_bound)
3119 pos = (FLAC__int64)lower_bound;
3120 if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3121 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3122 return false;
3123 }
3124 if(!FLAC__stream_decoder_flush(decoder)) {
3125 /* above call sets the state for us */
3126 return false;
3127 }
3128 /* Now we need to get a frame. First we need to reset our
3129 * unparseable_frame_count; if we get too many unparseable
3130 * frames in a row, the read callback will return
3131 * FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing
3132 * FLAC__stream_decoder_process_single() to return false.
3133 */
3134 decoder->private_->unparseable_frame_count = 0;
3135 if(!FLAC__stream_decoder_process_single(decoder)) {
3136 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3137 return false;
3138 }
3139 /* our write callback will change the state when it gets to the target frame */
3140 /* 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 */
3141 #if 0
3142 /*@@@@@@ used to be the following; not clear if the check for end of stream is needed anymore */
3143 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM)
3144 break;
3145 #endif
3146 if(!decoder->private_->is_seeking)
3147 break;
3148
3149 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3150 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3151
3152 if (0 == decoder->private_->samples_decoded || (this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek)) {
3153 if (pos == (FLAC__int64)lower_bound) {
3154 /* can't move back any more than the first frame, something is fatally wrong */
3155 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3156 return false;
3157 }
3158 /* our last move backwards wasn't big enough, try again */
3159 approx_bytes_per_frame = approx_bytes_per_frame? approx_bytes_per_frame * 2 : 16;
3160 continue;
3161 }
3162 /* allow one seek over upper bound, so we can get a correct upper_bound_sample for streams with unknown total_samples */
3163 first_seek = false;
3164
3165 /* make sure we are not seeking in corrupted stream */
3166 if (this_frame_sample < lower_bound_sample) {
3167 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3168 return false;
3169 }
3170
3171 /* we need to narrow the search */
3172 if(target_sample < this_frame_sample) {
3173 upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3174 /*@@@@@@ what will decode position be if at end of stream? */
3175 if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) {
3176 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3177 return false;
3178 }
3179 approx_bytes_per_frame = (unsigned)(2 * (upper_bound - pos) / 3 + 16);
3180 }
3181 else { /* target_sample >= this_frame_sample + this frame's blocksize */
3182 lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3183 if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) {
3184 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3185 return false;
3186 }
3187 approx_bytes_per_frame = (unsigned)(2 * (lower_bound - pos) / 3 + 16);
3188 }
3189 }
3190
3191 return true;
3192 }
3193
3194 #if FLAC__HAS_OGG
seek_to_absolute_sample_ogg_(FLAC__StreamDecoder * decoder,FLAC__uint64 stream_length,FLAC__uint64 target_sample)3195 FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
3196 {
3197 FLAC__uint64 left_pos = 0, right_pos = stream_length;
3198 FLAC__uint64 left_sample = 0, right_sample = FLAC__stream_decoder_get_total_samples(decoder);
3199 FLAC__uint64 this_frame_sample = (FLAC__uint64)0 - 1;
3200 FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */
3201 FLAC__bool did_a_seek;
3202 unsigned iteration = 0;
3203
3204 /* In the first iterations, we will calculate the target byte position
3205 * by the distance from the target sample to left_sample and
3206 * right_sample (let's call it "proportional search"). After that, we
3207 * will switch to binary search.
3208 */
3209 unsigned BINARY_SEARCH_AFTER_ITERATION = 2;
3210
3211 /* We will switch to a linear search once our current sample is less
3212 * than this number of samples ahead of the target sample
3213 */
3214 static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2;
3215
3216 /* If the total number of samples is unknown, use a large value, and
3217 * force binary search immediately.
3218 */
3219 if(right_sample == 0) {
3220 right_sample = (FLAC__uint64)(-1);
3221 BINARY_SEARCH_AFTER_ITERATION = 0;
3222 }
3223
3224 decoder->private_->target_sample = target_sample;
3225 for( ; ; iteration++) {
3226 if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) {
3227 if (iteration >= BINARY_SEARCH_AFTER_ITERATION) {
3228 pos = (right_pos + left_pos) / 2;
3229 }
3230 else {
3231 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3232 #if defined _MSC_VER || defined __MINGW32__
3233 /* with MSVC you have to spoon feed it the casting */
3234 pos = (FLAC__uint64)((FLAC__double)(FLAC__int64)(target_sample - left_sample) / (FLAC__double)(FLAC__int64)(right_sample - left_sample) * (FLAC__double)(FLAC__int64)(right_pos - left_pos));
3235 #else
3236 pos = (FLAC__uint64)((FLAC__double)(target_sample - left_sample) / (FLAC__double)(right_sample - left_sample) * (FLAC__double)(right_pos - left_pos));
3237 #endif
3238 #else
3239 /* a little less accurate: */
3240 if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff))
3241 pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample));
3242 else /* @@@ WATCHOUT, ~2TB limit */
3243 pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16));
3244 #endif
3245 /* @@@ TODO: might want to limit pos to some distance
3246 * before EOF, to make sure we land before the last frame,
3247 * thereby getting a this_frame_sample and so having a better
3248 * estimate.
3249 */
3250 }
3251
3252 /* physical seek */
3253 if(decoder->private_->seek_callback((FLAC__StreamDecoder*)decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3254 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3255 return false;
3256 }
3257 if(!FLAC__stream_decoder_flush(decoder)) {
3258 /* above call sets the state for us */
3259 return false;
3260 }
3261 did_a_seek = true;
3262 }
3263 else
3264 did_a_seek = false;
3265
3266 decoder->private_->got_a_frame = false;
3267 if(!FLAC__stream_decoder_process_single(decoder)) {
3268 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3269 return false;
3270 }
3271 if(!decoder->private_->got_a_frame) {
3272 if(did_a_seek) {
3273 /* this can happen if we seek to a point after the last frame; we drop
3274 * to binary search right away in this case to avoid any wasted
3275 * iterations of proportional search.
3276 */
3277 right_pos = pos;
3278 BINARY_SEARCH_AFTER_ITERATION = 0;
3279 }
3280 else {
3281 /* this can probably only happen if total_samples is unknown and the
3282 * target_sample is past the end of the stream
3283 */
3284 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3285 return false;
3286 }
3287 }
3288 /* our write callback will change the state when it gets to the target frame */
3289 else if(!decoder->private_->is_seeking) {
3290 break;
3291 }
3292 else {
3293 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3294 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3295
3296 if (did_a_seek) {
3297 if (this_frame_sample <= target_sample) {
3298 /* The 'equal' case should not happen, since
3299 * FLAC__stream_decoder_process_single()
3300 * should recognize that it has hit the
3301 * target sample and we would exit through
3302 * the 'break' above.
3303 */
3304 FLAC__ASSERT(this_frame_sample != target_sample);
3305
3306 left_sample = this_frame_sample;
3307 /* sanity check to avoid infinite loop */
3308 if (left_pos == pos) {
3309 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3310 return false;
3311 }
3312 left_pos = pos;
3313 }
3314 else if(this_frame_sample > target_sample) {
3315 right_sample = this_frame_sample;
3316 /* sanity check to avoid infinite loop */
3317 if (right_pos == pos) {
3318 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3319 return false;
3320 }
3321 right_pos = pos;
3322 }
3323 }
3324 }
3325 }
3326
3327 return true;
3328 }
3329 #endif
3330
file_read_callback_(const FLAC__StreamDecoder * decoder,FLAC__byte buffer[],size_t * bytes,void * client_data)3331 FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
3332 {
3333 (void)client_data;
3334
3335 if(*bytes > 0) {
3336 *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, decoder->private_->file);
3337 if(ferror(decoder->private_->file))
3338 return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
3339 else if(*bytes == 0)
3340 return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
3341 else
3342 return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
3343 }
3344 else
3345 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */
3346 }
3347
file_seek_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 absolute_byte_offset,void * client_data)3348 FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
3349 {
3350 (void)client_data;
3351
3352 if(decoder->private_->file == stdin)
3353 return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;
3354 else if(fseeko(decoder->private_->file, (off_t)absolute_byte_offset, SEEK_SET) < 0)
3355 return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
3356 else
3357 return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
3358 }
3359
file_tell_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 * absolute_byte_offset,void * client_data)3360 FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
3361 {
3362 off_t pos;
3363 (void)client_data;
3364
3365 if(decoder->private_->file == stdin)
3366 return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;
3367 else if((pos = ftello(decoder->private_->file)) < 0)
3368 return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
3369 else {
3370 *absolute_byte_offset = (FLAC__uint64)pos;
3371 return FLAC__STREAM_DECODER_TELL_STATUS_OK;
3372 }
3373 }
3374
file_length_callback_(const FLAC__StreamDecoder * decoder,FLAC__uint64 * stream_length,void * client_data)3375 FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
3376 {
3377 struct stat filestats;
3378 (void)client_data;
3379
3380 if(decoder->private_->file == stdin)
3381 return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;
3382 else if(fstat(fileno(decoder->private_->file), &filestats) != 0)
3383 return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
3384 else {
3385 *stream_length = (FLAC__uint64)filestats.st_size;
3386 return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
3387 }
3388 }
3389
file_eof_callback_(const FLAC__StreamDecoder * decoder,void * client_data)3390 FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data)
3391 {
3392 (void)client_data;
3393
3394 return feof(decoder->private_->file)? true : false;
3395 }
3396