1 /*
2 * BRSTM demuxer
3 * Copyright (c) 2012 Paul B Mahol
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/intreadwrite.h"
23 #include "libavcodec/bytestream.h"
24 #include "avformat.h"
25 #include "internal.h"
26
27 typedef struct BRSTMCoeffOffset {
28 uint8_t channel;
29 uint32_t offset;
30 } BRSTMCoeffOffset;
31
32 typedef struct BRSTMDemuxContext {
33 uint32_t block_size;
34 uint32_t block_count;
35 uint32_t current_block;
36 uint32_t samples_per_block;
37 uint32_t last_block_used_bytes;
38 uint32_t last_block_size;
39 uint32_t last_block_samples;
40 uint32_t data_start;
41 uint8_t table[256 * 32];
42 uint8_t *adpc;
43 BRSTMCoeffOffset offsets[256];
44 int little_endian;
45 } BRSTMDemuxContext;
46
probe(const AVProbeData * p)47 static int probe(const AVProbeData *p)
48 {
49 if (AV_RL32(p->buf) == MKTAG('R','S','T','M') &&
50 (AV_RL16(p->buf + 4) == 0xFFFE ||
51 AV_RL16(p->buf + 4) == 0xFEFF))
52 return AVPROBE_SCORE_MAX / 3 * 2;
53 return 0;
54 }
55
probe_bfstm(const AVProbeData * p)56 static int probe_bfstm(const AVProbeData *p)
57 {
58 if ((AV_RL32(p->buf) == MKTAG('F','S','T','M') ||
59 AV_RL32(p->buf) == MKTAG('C','S','T','M')) &&
60 (AV_RL16(p->buf + 4) == 0xFFFE ||
61 AV_RL16(p->buf + 4) == 0xFEFF))
62 return AVPROBE_SCORE_MAX / 3 * 2;
63 return 0;
64 }
65
read_close(AVFormatContext * s)66 static int read_close(AVFormatContext *s)
67 {
68 BRSTMDemuxContext *b = s->priv_data;
69
70 av_freep(&b->adpc);
71
72 return 0;
73 }
74
sort_offsets(const void * a,const void * b)75 static int sort_offsets(const void *a, const void *b)
76 {
77 const BRSTMCoeffOffset *s1 = a;
78 const BRSTMCoeffOffset *s2 = b;
79 return FFDIFFSIGN(s1->offset, s2->offset);
80 }
81
read16(AVFormatContext * s)82 static av_always_inline unsigned int read16(AVFormatContext *s)
83 {
84 BRSTMDemuxContext *b = s->priv_data;
85 if (b->little_endian)
86 return avio_rl16(s->pb);
87 else
88 return avio_rb16(s->pb);
89 }
90
read32(AVFormatContext * s)91 static av_always_inline unsigned int read32(AVFormatContext *s)
92 {
93 BRSTMDemuxContext *b = s->priv_data;
94 if (b->little_endian)
95 return avio_rl32(s->pb);
96 else
97 return avio_rb32(s->pb);
98 }
99
read_header(AVFormatContext * s)100 static int read_header(AVFormatContext *s)
101 {
102 BRSTMDemuxContext *b = s->priv_data;
103 int bom, major, minor, codec, chunk;
104 int64_t h1offset, pos, toffset;
105 uint32_t size, asize, start = 0;
106 AVStream *st;
107 int ret = AVERROR_EOF;
108 int loop = 0;
109 int bfstm = !strcmp("bfstm", s->iformat->name);
110
111 st = avformat_new_stream(s, NULL);
112 if (!st)
113 return AVERROR(ENOMEM);
114 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
115
116 avio_skip(s->pb, 4);
117
118 bom = avio_rb16(s->pb);
119 if (bom != 0xFEFF && bom != 0xFFFE) {
120 av_log(s, AV_LOG_ERROR, "invalid byte order: %X\n", bom);
121 return AVERROR_INVALIDDATA;
122 }
123
124 if (bom == 0xFFFE)
125 b->little_endian = 1;
126
127 if (!bfstm) {
128 major = avio_r8(s->pb);
129 minor = avio_r8(s->pb);
130 avio_skip(s->pb, 4); // size of file
131 size = read16(s);
132 if (size < 14)
133 return AVERROR_INVALIDDATA;
134
135 avio_skip(s->pb, size - 14);
136 pos = avio_tell(s->pb);
137 if (avio_rl32(s->pb) != MKTAG('H','E','A','D'))
138 return AVERROR_INVALIDDATA;
139 } else {
140 uint32_t info_offset = 0;
141 uint16_t section_count, header_size, i;
142
143 header_size = read16(s); // 6
144
145 avio_skip(s->pb, 4); // Unknown constant 0x00030000
146 avio_skip(s->pb, 4); // size of file
147 section_count = read16(s);
148 avio_skip(s->pb, 2); // padding
149 for (i = 0; avio_tell(s->pb) < header_size
150 && !(start && info_offset)
151 && i < section_count; i++) {
152 uint16_t flag = read16(s);
153 avio_skip(s->pb, 2);
154 switch (flag) {
155 case 0x4000:
156 info_offset = read32(s);
157 /*info_size =*/ read32(s);
158 break;
159 case 0x4001:
160 avio_skip(s->pb, 4); // seek offset
161 avio_skip(s->pb, 4); // seek size
162 break;
163 case 0x4002:
164 start = read32(s) + 8;
165 avio_skip(s->pb, 4); //data_size = read32(s);
166 break;
167 case 0x4003:
168 avio_skip(s->pb, 4); // REGN offset
169 avio_skip(s->pb, 4); // REGN size
170 break;
171 }
172 }
173
174 if (!info_offset || !start)
175 return AVERROR_INVALIDDATA;
176
177 avio_skip(s->pb, info_offset - avio_tell(s->pb));
178 pos = avio_tell(s->pb);
179 if (avio_rl32(s->pb) != MKTAG('I','N','F','O'))
180 return AVERROR_INVALIDDATA;
181 }
182
183 size = read32(s);
184 if (size < 40)
185 return AVERROR_INVALIDDATA;
186 avio_skip(s->pb, 4); // unknown
187 h1offset = read32(s);
188 if (h1offset > size)
189 return AVERROR_INVALIDDATA;
190 avio_skip(s->pb, 12);
191 toffset = read32(s) + 16LL;
192 if (toffset > size)
193 return AVERROR_INVALIDDATA;
194
195 avio_skip(s->pb, pos + h1offset + 8 - avio_tell(s->pb));
196 codec = avio_r8(s->pb);
197
198 switch (codec) {
199 case 0: codec = AV_CODEC_ID_PCM_S8_PLANAR; break;
200 case 1: codec = b->little_endian ?
201 AV_CODEC_ID_PCM_S16LE_PLANAR :
202 AV_CODEC_ID_PCM_S16BE_PLANAR; break;
203 case 2: codec = b->little_endian ?
204 AV_CODEC_ID_ADPCM_THP_LE :
205 AV_CODEC_ID_ADPCM_THP; break;
206 default:
207 avpriv_request_sample(s, "codec %d", codec);
208 return AVERROR_PATCHWELCOME;
209 }
210
211 loop = avio_r8(s->pb); // loop flag
212 st->codecpar->codec_id = codec;
213 st->codecpar->channels = avio_r8(s->pb);
214 if (!st->codecpar->channels)
215 return AVERROR_INVALIDDATA;
216
217 avio_skip(s->pb, 1); // padding
218
219 st->codecpar->sample_rate = bfstm ? read32(s) : read16(s);
220 if (st->codecpar->sample_rate <= 0)
221 return AVERROR_INVALIDDATA;
222
223 if (!bfstm)
224 avio_skip(s->pb, 2); // padding
225
226 if (loop) {
227 if (av_dict_set_int(&s->metadata, "loop_start",
228 av_rescale(read32(s), AV_TIME_BASE,
229 st->codecpar->sample_rate),
230 0) < 0)
231 return AVERROR(ENOMEM);
232 } else {
233 avio_skip(s->pb, 4);
234 }
235
236 st->start_time = 0;
237 st->duration = read32(s);
238 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
239
240 if (!bfstm)
241 start = read32(s);
242 b->current_block = 0;
243 b->block_count = read32(s);
244 if (b->block_count > UINT16_MAX) {
245 av_log(s, AV_LOG_WARNING, "too many blocks: %"PRIu32"\n", b->block_count);
246 return AVERROR_INVALIDDATA;
247 }
248
249 b->block_size = read32(s);
250 if (b->block_size > UINT32_MAX / st->codecpar->channels)
251 return AVERROR_INVALIDDATA;
252
253 b->samples_per_block = read32(s);
254 b->last_block_used_bytes = read32(s);
255 b->last_block_samples = read32(s);
256 b->last_block_size = read32(s);
257 if (b->last_block_size > UINT32_MAX / st->codecpar->channels)
258 return AVERROR_INVALIDDATA;
259 if (b->last_block_used_bytes > b->last_block_size)
260 return AVERROR_INVALIDDATA;
261
262
263 if (codec == AV_CODEC_ID_ADPCM_THP || codec == AV_CODEC_ID_ADPCM_THP_LE) {
264 int ch;
265
266 avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
267 if (!bfstm)
268 toffset = read32(s) + 16LL;
269 else
270 toffset = toffset + read32(s) + st->codecpar->channels * 8 - 8;
271 if (toffset > size)
272 return AVERROR_INVALIDDATA;
273
274 if (!bfstm) {
275 avio_skip(s->pb, pos + toffset - avio_tell(s->pb) - 8LL * (st->codecpar->channels + 1));
276 for (ch = 0; ch < st->codecpar->channels; ch++) {
277 avio_skip(s->pb, 4);
278 b->offsets[ch].channel = ch;
279 b->offsets[ch].offset = read32(s);
280 }
281
282 qsort(b->offsets, st->codecpar->channels, sizeof(*b->offsets), sort_offsets);
283 }
284
285 avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
286
287 for (ch = 0; ch < st->codecpar->channels; ch++) {
288 if (!bfstm)
289 avio_skip(s->pb, pos + 16LL + b->offsets[ch].offset - avio_tell(s->pb));
290
291 if (avio_read(s->pb, b->table + ch * 32, 32) != 32) {
292 ret = AVERROR_INVALIDDATA;
293 goto fail;
294 }
295
296 if (bfstm)
297 avio_skip(s->pb, 14);
298 }
299 }
300
301 if (size < (avio_tell(s->pb) - pos)) {
302 ret = AVERROR_INVALIDDATA;
303 goto fail;
304 }
305
306 avio_skip(s->pb, size - (avio_tell(s->pb) - pos));
307
308 while (!avio_feof(s->pb)) {
309 chunk = avio_rl32(s->pb);
310 size = read32(s);
311 if (size < 8) {
312 ret = AVERROR_INVALIDDATA;
313 goto fail;
314 }
315 size -= 8;
316 switch (chunk) {
317 case MKTAG('S','E','E','K'):
318 case MKTAG('A','D','P','C'):
319 if (codec != AV_CODEC_ID_ADPCM_THP &&
320 codec != AV_CODEC_ID_ADPCM_THP_LE)
321 goto skip;
322
323 asize = b->block_count * st->codecpar->channels * 4;
324 if (size < asize) {
325 ret = AVERROR_INVALIDDATA;
326 goto fail;
327 }
328 if (b->adpc) {
329 av_log(s, AV_LOG_WARNING, "skipping additional ADPC chunk\n");
330 goto skip;
331 } else {
332 b->adpc = av_mallocz(asize);
333 if (!b->adpc) {
334 ret = AVERROR(ENOMEM);
335 goto fail;
336 }
337 if (bfstm && codec != AV_CODEC_ID_ADPCM_THP_LE) {
338 // Big-endian BFSTMs have little-endian SEEK tables
339 // for some strange reason.
340 int i;
341 for (i = 0; i < asize; i += 2) {
342 b->adpc[i+1] = avio_r8(s->pb);
343 b->adpc[i] = avio_r8(s->pb);
344 }
345 } else {
346 avio_read(s->pb, b->adpc, asize);
347 }
348 avio_skip(s->pb, size - asize);
349 }
350 break;
351 case MKTAG('D','A','T','A'):
352 if ((start < avio_tell(s->pb)) ||
353 (!b->adpc && (codec == AV_CODEC_ID_ADPCM_THP ||
354 codec == AV_CODEC_ID_ADPCM_THP_LE))) {
355 ret = AVERROR_INVALIDDATA;
356 goto fail;
357 }
358 avio_skip(s->pb, start - avio_tell(s->pb));
359
360 if (bfstm && (codec == AV_CODEC_ID_ADPCM_THP ||
361 codec == AV_CODEC_ID_ADPCM_THP_LE))
362 avio_skip(s->pb, 24);
363
364 b->data_start = avio_tell(s->pb);
365
366 if (!bfstm && (major != 1 || minor))
367 avpriv_request_sample(s, "Version %d.%d", major, minor);
368
369 return 0;
370 default:
371 av_log(s, AV_LOG_WARNING, "skipping unknown chunk: %X\n", chunk);
372 skip:
373 avio_skip(s->pb, size);
374 }
375 }
376
377 fail:
378 read_close(s);
379
380 return ret;
381 }
382
read_packet(AVFormatContext * s,AVPacket * pkt)383 static int read_packet(AVFormatContext *s, AVPacket *pkt)
384 {
385 AVCodecParameters *par = s->streams[0]->codecpar;
386 BRSTMDemuxContext *b = s->priv_data;
387 uint32_t samples, size, skip = 0;
388 int ret, i;
389
390 if (avio_feof(s->pb))
391 return AVERROR_EOF;
392 b->current_block++;
393 if (b->current_block == b->block_count) {
394 size = b->last_block_used_bytes;
395 samples = b->last_block_samples;
396 skip = b->last_block_size - b->last_block_used_bytes;
397
398 if (samples < size * 14 / 8) {
399 uint32_t adjusted_size = samples / 14 * 8;
400 if (samples % 14)
401 adjusted_size += (samples % 14 + 1) / 2 + 1;
402
403 skip += size - adjusted_size;
404 size = adjusted_size;
405 }
406 } else if (b->current_block < b->block_count) {
407 size = b->block_size;
408 samples = b->samples_per_block;
409 } else {
410 return AVERROR_EOF;
411 }
412
413 if (par->codec_id == AV_CODEC_ID_ADPCM_THP ||
414 par->codec_id == AV_CODEC_ID_ADPCM_THP_LE) {
415 uint8_t *dst;
416
417 if (!b->adpc) {
418 av_log(s, AV_LOG_ERROR, "adpcm_thp requires ADPC chunk, but none was found.\n");
419 return AVERROR_INVALIDDATA;
420 }
421
422 if (size > (INT_MAX - 32 - 4) ||
423 (32 + 4 + size) > (INT_MAX / par->channels) ||
424 (32 + 4 + size) * par->channels > INT_MAX - 8)
425 return AVERROR_INVALIDDATA;
426 if ((ret = av_new_packet(pkt, 8 + (32 + 4 + size) * par->channels)) < 0)
427 return ret;
428 dst = pkt->data;
429 if (par->codec_id == AV_CODEC_ID_ADPCM_THP_LE) {
430 bytestream_put_le32(&dst, size * par->channels);
431 bytestream_put_le32(&dst, samples);
432 } else {
433 bytestream_put_be32(&dst, size * par->channels);
434 bytestream_put_be32(&dst, samples);
435 }
436 bytestream_put_buffer(&dst, b->table, 32 * par->channels);
437 bytestream_put_buffer(&dst, b->adpc + 4 * par->channels *
438 (b->current_block - 1), 4 * par->channels);
439
440 for (i = 0; i < par->channels; i++) {
441 ret = avio_read(s->pb, dst, size);
442 dst += size;
443 avio_skip(s->pb, skip);
444 if (ret != size) {
445 return AVERROR(EIO);
446 }
447 }
448 pkt->duration = samples;
449 } else {
450 size *= par->channels;
451 ret = av_get_packet(s->pb, pkt, size);
452 }
453
454 pkt->stream_index = 0;
455
456 if (ret != size)
457 ret = AVERROR(EIO);
458
459 return ret;
460 }
461
read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)462 static int read_seek(AVFormatContext *s, int stream_index,
463 int64_t timestamp, int flags)
464 {
465 AVStream *st = s->streams[stream_index];
466 BRSTMDemuxContext *b = s->priv_data;
467 int64_t ret = 0;
468
469 if (timestamp < 0)
470 timestamp = 0;
471 timestamp /= b->samples_per_block;
472 if (timestamp >= b->block_count)
473 timestamp = b->block_count - 1;
474 ret = avio_seek(s->pb, b->data_start + timestamp * b->block_size *
475 st->codecpar->channels, SEEK_SET);
476 if (ret < 0)
477 return ret;
478
479 b->current_block = timestamp;
480 ff_update_cur_dts(s, st, timestamp * b->samples_per_block);
481 return 0;
482 }
483
484 AVInputFormat ff_brstm_demuxer = {
485 .name = "brstm",
486 .long_name = NULL_IF_CONFIG_SMALL("BRSTM (Binary Revolution Stream)"),
487 .priv_data_size = sizeof(BRSTMDemuxContext),
488 .read_probe = probe,
489 .read_header = read_header,
490 .read_packet = read_packet,
491 .read_close = read_close,
492 .read_seek = read_seek,
493 .extensions = "brstm",
494 };
495
496 AVInputFormat ff_bfstm_demuxer = {
497 .name = "bfstm",
498 .long_name = NULL_IF_CONFIG_SMALL("BFSTM (Binary Cafe Stream)"),
499 .priv_data_size = sizeof(BRSTMDemuxContext),
500 .read_probe = probe_bfstm,
501 .read_header = read_header,
502 .read_packet = read_packet,
503 .read_close = read_close,
504 .read_seek = read_seek,
505 .extensions = "bfstm,bcstm",
506 };
507