FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/brstm.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 224 292 76.7%
Functions: 8 9 88.9%
Branches: 125 190 65.8%
Line Branch Exec Source
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 "libavutil/mem.h"
24 #include "libavcodec/bytestream.h"
25 #include "avformat.h"
26 #include "avio_internal.h"
27 #include "demux.h"
28 #include "internal.h"
29
30 typedef struct BRSTMCoeffOffset {
31 uint8_t channel;
32 uint32_t offset;
33 } BRSTMCoeffOffset;
34
35 typedef struct BRSTMDemuxContext {
36 uint32_t block_size;
37 uint32_t block_count;
38 uint32_t current_block;
39 uint32_t samples_per_block;
40 uint32_t last_block_used_bytes;
41 uint32_t last_block_size;
42 uint32_t last_block_samples;
43 uint32_t data_start;
44 uint8_t table[256 * 32];
45 uint8_t *adpc;
46 BRSTMCoeffOffset offsets[256];
47 int little_endian;
48 } BRSTMDemuxContext;
49
50 7480 static int probe(const AVProbeData *p)
51 {
52
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 7480 if (AV_RL32(p->buf) == MKTAG('R','S','T','M') &&
53
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 1 (AV_RL16(p->buf + 4) == 0xFFFE ||
54 ✗ AV_RL16(p->buf + 4) == 0xFEFF))
55 1 return AVPROBE_SCORE_MAX / 3 * 2;
56 7479 return 0;
57 }
58
59 7480 static int probe_bfstm(const AVProbeData *p)
60 {
61
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 7480 if ((AV_RL32(p->buf) == MKTAG('F','S','T','M') ||
62
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 7479 AV_RL32(p->buf) == MKTAG('C','S','T','M')) &&
63
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 2 (AV_RL16(p->buf + 4) == 0xFFFE ||
64
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 1 AV_RL16(p->buf + 4) == 0xFEFF))
65 2 return AVPROBE_SCORE_MAX / 3 * 2;
66 7478 return 0;
67 }
68
69 3 static int read_close(AVFormatContext *s)
70 {
71 3 BRSTMDemuxContext *b = s->priv_data;
72
73 3 av_freep(&b->adpc);
74
75 3 return 0;
76 }
77
78 7 static int sort_offsets(const void *a, const void *b)
79 {
80 7 const BRSTMCoeffOffset *s1 = a;
81 7 const BRSTMCoeffOffset *s2 = b;
82 7 return FFDIFFSIGN(s1->offset, s2->offset);
83 }
84
85 12 static av_always_inline unsigned int read16(AVFormatContext *s)
86 {
87 12 BRSTMDemuxContext *b = s->priv_data;
88
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 12 if (b->little_endian)
89 5 return avio_rl16(s->pb);
90 else
91 7 return avio_rb16(s->pb);
92 }
93
94 56 static av_always_inline unsigned int read32(AVFormatContext *s)
95 {
96 56 BRSTMDemuxContext *b = s->priv_data;
97
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 56 if (b->little_endian)
98 17 return avio_rl32(s->pb);
99 else
100 39 return avio_rb32(s->pb);
101 }
102
103 3 static int read_header(AVFormatContext *s)
104 {
105 3 BRSTMDemuxContext *b = s->priv_data;
106 int bom, major, minor, codec, chunk;
107 int64_t h1offset, pos, toffset;
108 3 uint32_t size, asize, start = 0;
109 AVStream *st;
110 3 int loop = 0;
111 3 int bfstm = !strcmp("bfstm", s->iformat->name);
112
113 3 st = avformat_new_stream(s, NULL);
114
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 3 if (!st)
115 ✗ return AVERROR(ENOMEM);
116 3 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
117
118 3 avio_skip(s->pb, 4);
119
120 3 bom = avio_rb16(s->pb);
121
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 3 if (bom != 0xFEFF && bom != 0xFFFE) {
122 ✗ av_log(s, AV_LOG_ERROR, "invalid byte order: %X\n", bom);
123 ✗ return AVERROR_INVALIDDATA;
124 }
125
126
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 3 if (bom == 0xFFFE)
127 1 b->little_endian = 1;
128
129
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 3 if (!bfstm) {
130 1 major = avio_r8(s->pb);
131 1 minor = avio_r8(s->pb);
132 1 avio_skip(s->pb, 4); // size of file
133 1 size = read16(s);
134
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 1 if (size < 14)
135 ✗ return AVERROR_INVALIDDATA;
136
137 1 avio_skip(s->pb, size - 14);
138 1 pos = avio_tell(s->pb);
139
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 1 if (avio_rl32(s->pb) != MKTAG('H','E','A','D'))
140 ✗ return AVERROR_INVALIDDATA;
141 } else {
142 2 uint32_t info_offset = 0;
143 uint16_t section_count, header_size, i;
144
145 2 header_size = read16(s); // 6
146
147 2 avio_skip(s->pb, 4); // Unknown constant 0x00030000
148 2 avio_skip(s->pb, 4); // size of file
149 2 section_count = read16(s);
150 2 avio_skip(s->pb, 2); // padding
151 8 for (i = 0; avio_tell(s->pb) < header_size
152
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 8 && !(start && info_offset)
153
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 20 && i < section_count; i++) {
154 6 uint16_t flag = read16(s);
155 6 avio_skip(s->pb, 2);
156
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 6 switch (flag) {
157 2 case 0x4000:
158 2 info_offset = read32(s);
159 2 /*info_size =*/ read32(s);
160 2 break;
161 2 case 0x4001:
162 2 avio_skip(s->pb, 4); // seek offset
163 2 avio_skip(s->pb, 4); // seek size
164 2 break;
165 2 case 0x4002:
166 2 start = read32(s) + 8;
167 2 avio_skip(s->pb, 4); //data_size = read32(s);
168 2 break;
169 ✗ case 0x4003:
170 ✗ avio_skip(s->pb, 4); // REGN offset
171 ✗ avio_skip(s->pb, 4); // REGN size
172 ✗ break;
173 }
174 }
175
176
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 2 if (!info_offset || !start)
177 ✗ return AVERROR_INVALIDDATA;
178
179 2 avio_skip(s->pb, info_offset - avio_tell(s->pb));
180 2 pos = avio_tell(s->pb);
181
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 2 if (avio_rl32(s->pb) != MKTAG('I','N','F','O'))
182 ✗ return AVERROR_INVALIDDATA;
183 }
184
185 3 size = read32(s);
186
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 3 if (size < 40)
187 ✗ return AVERROR_INVALIDDATA;
188 3 avio_skip(s->pb, 4); // unknown
189 3 h1offset = read32(s);
190
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 3 if (h1offset > size)
191 ✗ return AVERROR_INVALIDDATA;
192 3 avio_skip(s->pb, 12);
193 3 toffset = read32(s) + 16LL;
194
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 3 if (toffset > size)
195 ✗ return AVERROR_INVALIDDATA;
196
197 3 avio_skip(s->pb, pos + h1offset + 8 - avio_tell(s->pb));
198 3 codec = avio_r8(s->pb);
199
200
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 3 switch (codec) {
201 ✗ case 0: codec = AV_CODEC_ID_PCM_S8_PLANAR; break;
202 ✗ case 1: codec = b->little_endian ?
203 ✗ AV_CODEC_ID_PCM_S16LE_PLANAR :
204 ✗ AV_CODEC_ID_PCM_S16BE_PLANAR; break;
205 6 case 2: codec = b->little_endian ?
206
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 3 AV_CODEC_ID_ADPCM_THP_LE :
207 3 AV_CODEC_ID_ADPCM_THP; break;
208 ✗ default:
209 ✗ avpriv_request_sample(s, "codec %d", codec);
210 ✗ return AVERROR_PATCHWELCOME;
211 }
212
213 3 loop = avio_r8(s->pb); // loop flag
214 3 st->codecpar->codec_id = codec;
215 3 st->codecpar->ch_layout.nb_channels = avio_r8(s->pb);
216
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 3 if (!st->codecpar->ch_layout.nb_channels)
217 ✗ return AVERROR_INVALIDDATA;
218
219 3 avio_skip(s->pb, 1); // padding
220
221
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 3 st->codecpar->sample_rate = bfstm ? read32(s) : read16(s);
222
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 3 if (st->codecpar->sample_rate <= 0)
223 ✗ return AVERROR_INVALIDDATA;
224
225
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 3 if (!bfstm)
226 1 avio_skip(s->pb, 2); // padding
227
228
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 3 if (loop) {
229
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 2 if (av_dict_set_int(&s->metadata, "loop_start",
230 2 av_rescale(read32(s), AV_TIME_BASE,
231 2 st->codecpar->sample_rate),
232 0) < 0)
233 ✗ return AVERROR(ENOMEM);
234 } else {
235 1 avio_skip(s->pb, 4);
236 }
237
238 3 st->start_time = 0;
239 3 st->duration = read32(s);
240 3 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
241
242
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 3 if (!bfstm)
243 1 start = read32(s);
244 3 b->current_block = 0;
245 3 b->block_count = read32(s);
246
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 3 if (b->block_count > UINT16_MAX) {
247 ✗ av_log(s, AV_LOG_WARNING, "too many blocks: %"PRIu32"\n", b->block_count);
248 ✗ return AVERROR_INVALIDDATA;
249 }
250
251 3 b->block_size = read32(s);
252
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 3 if (b->block_size > UINT32_MAX / st->codecpar->ch_layout.nb_channels)
253 ✗ return AVERROR_INVALIDDATA;
254
255 3 b->samples_per_block = read32(s);
256 3 b->last_block_used_bytes = read32(s);
257 3 b->last_block_samples = read32(s);
258 3 b->last_block_size = read32(s);
259
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 3 if (b->last_block_size > UINT32_MAX / st->codecpar->ch_layout.nb_channels)
260 ✗ return AVERROR_INVALIDDATA;
261
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 3 if (b->last_block_used_bytes > b->last_block_size)
262 ✗ return AVERROR_INVALIDDATA;
263
264
265
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 3 if (codec == AV_CODEC_ID_ADPCM_THP || codec == AV_CODEC_ID_ADPCM_THP_LE) {
266 int ch;
267
268 3 avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
269
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 3 if (!bfstm)
270 1 toffset = read32(s) + 16LL;
271 else
272 2 toffset = toffset + read32(s) + st->codecpar->ch_layout.nb_channels * 8 - 8;
273
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 3 if (toffset > size)
274 ✗ return AVERROR_INVALIDDATA;
275
276
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 3 if (!bfstm) {
277 1 avio_skip(s->pb, pos + toffset - avio_tell(s->pb) - 8LL * (st->codecpar->ch_layout.nb_channels + 1));
278
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 7 for (ch = 0; ch < st->codecpar->ch_layout.nb_channels; ch++) {
279 6 avio_skip(s->pb, 4);
280 6 b->offsets[ch].channel = ch;
281 6 b->offsets[ch].offset = read32(s);
282 }
283
284 1 qsort(b->offsets, st->codecpar->ch_layout.nb_channels, sizeof(*b->offsets), sort_offsets);
285 }
286
287 3 avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
288
289
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 12 for (ch = 0; ch < st->codecpar->ch_layout.nb_channels; ch++) {
290
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 9 if (!bfstm)
291 6 avio_skip(s->pb, pos + 16LL + b->offsets[ch].offset - avio_tell(s->pb));
292
293
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 9 if (avio_read(s->pb, b->table + ch * 32, 32) != 32)
294 ✗ return AVERROR_INVALIDDATA;
295
296
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 9 if (bfstm)
297 3 avio_skip(s->pb, 14);
298 }
299 }
300
301
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 3 if (size < (avio_tell(s->pb) - pos))
302 ✗ return AVERROR_INVALIDDATA;
303
304 3 avio_skip(s->pb, size - (avio_tell(s->pb) - pos));
305
306
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 6 while (!avio_feof(s->pb)) {
307 6 chunk = avio_rl32(s->pb);
308 6 size = read32(s);
309
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 6 if (size < 8)
310 ✗ return AVERROR_INVALIDDATA;
311 6 size -= 8;
312
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 6 switch (chunk) {
313 3 case MKTAG('S','E','E','K'):
314 case MKTAG('A','D','P','C'):
315
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 3 if (codec != AV_CODEC_ID_ADPCM_THP &&
316 codec != AV_CODEC_ID_ADPCM_THP_LE)
317 ✗ goto skip;
318
319 3 asize = b->block_count * st->codecpar->ch_layout.nb_channels * 4;
320
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 3 if (size < asize)
321 ✗ return AVERROR_INVALIDDATA;
322
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 3 if (b->adpc) {
323 ✗ av_log(s, AV_LOG_WARNING, "skipping additional ADPC chunk\n");
324 ✗ goto skip;
325 } else {
326 3 b->adpc = av_mallocz(asize);
327
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 3 if (!b->adpc)
328 ✗ return AVERROR(ENOMEM);
329
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 4 if (bfstm && codec != AV_CODEC_ID_ADPCM_THP_LE) {
330 // Big-endian BFSTMs have little-endian SEEK tables
331 // for some strange reason.
332 int i;
333
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 33 for (i = 0; i < asize; i += 2) {
334 32 b->adpc[i+1] = avio_r8(s->pb);
335 32 b->adpc[i] = avio_r8(s->pb);
336 }
337 } else {
338 2 avio_read(s->pb, b->adpc, asize);
339 }
340 3 avio_skip(s->pb, size - asize);
341 }
342 3 break;
343 3 case MKTAG('D','A','T','A'):
344
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 3 if ((start < avio_tell(s->pb)) ||
345
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 3 (!b->adpc && (codec == AV_CODEC_ID_ADPCM_THP ||
346 codec == AV_CODEC_ID_ADPCM_THP_LE)))
347 ✗ return AVERROR_INVALIDDATA;
348 3 avio_skip(s->pb, start - avio_tell(s->pb));
349
350
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 3 if (bfstm && (codec == AV_CODEC_ID_ADPCM_THP ||
351 codec == AV_CODEC_ID_ADPCM_THP_LE))
352 2 avio_skip(s->pb, 24);
353
354 3 b->data_start = avio_tell(s->pb);
355
356
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 3 if (!bfstm && (major != 1 || minor))
357 ✗ avpriv_request_sample(s, "Version %d.%d", major, minor);
358
359 3 return 0;
360 ✗ default:
361 ✗ av_log(s, AV_LOG_WARNING, "skipping unknown chunk: %X\n", chunk);
362 ✗ skip:
363 ✗ avio_skip(s->pb, size);
364 }
365 }
366
367 ✗ return AVERROR_EOF;
368 }
369
370 30 static int read_packet(AVFormatContext *s, AVPacket *pkt)
371 {
372 30 AVCodecParameters *par = s->streams[0]->codecpar;
373 30 BRSTMDemuxContext *b = s->priv_data;
374 30 uint32_t samples, size, skip = 0;
375 30 int channels = par->ch_layout.nb_channels;
376 int ret, i;
377
378
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 30 if (avio_feof(s->pb))
379 1 return AVERROR_EOF;
380 29 b->current_block++;
381
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 29 if (b->current_block == b->block_count) {
382 2 size = b->last_block_used_bytes;
383 2 samples = b->last_block_samples;
384 2 skip = b->last_block_size - b->last_block_used_bytes;
385
386
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 2 if (samples < size * 14 / 8) {
387 1 uint32_t adjusted_size = samples / 14 * 8;
388
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 1 if (samples % 14)
389 1 adjusted_size += (samples % 14 + 1) / 2 + 1;
390
391 1 skip += size - adjusted_size;
392 1 size = adjusted_size;
393 }
394
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 27 } else if (b->current_block < b->block_count) {
395 24 size = b->block_size;
396 24 samples = b->samples_per_block;
397 } else {
398 3 return AVERROR_EOF;
399 }
400
401
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 26 if (par->codec_id == AV_CODEC_ID_ADPCM_THP ||
402
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 5 par->codec_id == AV_CODEC_ID_ADPCM_THP_LE) {
403 uint8_t *dst;
404
405
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 26 if (!b->adpc) {
406 ✗ av_log(s, AV_LOG_ERROR, "adpcm_thp requires ADPC chunk, but none was found.\n");
407 1 return AVERROR_INVALIDDATA;
408 }
409
410
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 26 if (size > (INT_MAX - 32 - 4) ||
411
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 26 (32 + 4 + size) > (INT_MAX / channels) ||
412
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 26 (32 + 4 + size) * channels > INT_MAX - 8)
413 ✗ return AVERROR_INVALIDDATA;
414
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 26 if ((ret = av_new_packet(pkt, 8 + (32 + 4 + size) * channels)) < 0)
415 ✗ return ret;
416 26 dst = pkt->data;
417
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 26 if (par->codec_id == AV_CODEC_ID_ADPCM_THP_LE) {
418 5 bytestream_put_le32(&dst, size * channels);
419 5 bytestream_put_le32(&dst, samples);
420 } else {
421 21 bytestream_put_be32(&dst, size * channels);
422 21 bytestream_put_be32(&dst, samples);
423 }
424 26 bytestream_put_buffer(&dst, b->table, 32 * channels);
425 26 bytestream_put_buffer(&dst, b->adpc + 4 * channels *
426 26 (b->current_block - 1), 4 * channels);
427
428
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 76 for (i = 0; i < channels; i++) {
429 51 ret = ffio_read_size(s->pb, dst, size);
430 51 dst += size;
431 51 avio_skip(s->pb, skip);
432
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 51 if (ret < 0) {
433 1 return ret;
434 }
435 }
436 25 pkt->duration = samples;
437 } else {
438 ✗ size *= channels;
439 ✗ ret = av_get_packet(s->pb, pkt, size);
440 }
441
442 25 pkt->stream_index = 0;
443
444
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 25 if (ret != size)
445 ✗ ret = AVERROR_INVALIDDATA;
446
447 25 return ret;
448 }
449
450 ✗ static int read_seek(AVFormatContext *s, int stream_index,
451 int64_t timestamp, int flags)
452 {
453 ✗ AVStream *st = s->streams[stream_index];
454 ✗ BRSTMDemuxContext *b = s->priv_data;
455 ✗ int64_t ret = 0;
456
457 ✗ if (timestamp < 0)
458 ✗ timestamp = 0;
459 ✗ timestamp /= b->samples_per_block;
460 ✗ if (timestamp >= b->block_count)
461 ✗ timestamp = b->block_count - 1;
462 ✗ ret = avio_seek(s->pb, b->data_start + timestamp * b->block_size *
463 ✗ st->codecpar->ch_layout.nb_channels, SEEK_SET);
464 ✗ if (ret < 0)
465 ✗ return ret;
466
467 ✗ b->current_block = timestamp;
468 ✗ avpriv_update_cur_dts(s, st, timestamp * b->samples_per_block);
469 ✗ return 0;
470 }
471
472 const FFInputFormat ff_brstm_demuxer = {
473 .p.name = "brstm",
474 .p.long_name = NULL_IF_CONFIG_SMALL("BRSTM (Binary Revolution Stream)"),
475 .p.extensions = "brstm",
476 .priv_data_size = sizeof(BRSTMDemuxContext),
477 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
478 .read_probe = probe,
479 .read_header = read_header,
480 .read_packet = read_packet,
481 .read_close = read_close,
482 .read_seek = read_seek,
483 };
484
485 const FFInputFormat ff_bfstm_demuxer = {
486 .p.name = "bfstm",
487 .p.long_name = NULL_IF_CONFIG_SMALL("BFSTM (Binary Cafe Stream)"),
488 .p.extensions = "bfstm,bcstm",
489 .priv_data_size = sizeof(BRSTMDemuxContext),
490 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
491 .read_probe = probe_bfstm,
492 .read_header = read_header,
493 .read_packet = read_packet,
494 .read_close = read_close,
495 .read_seek = read_seek,
496 };
497