FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/opus/parse.c
Date: 2026-01-10 16:00:25
Exec Total Coverage
Lines: 173 266 65.0%
Functions: 6 6 100.0%
Branches: 90 165 54.5%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2012 Andrew D'Addesio
3 * Copyright (c) 2013-2014 Mozilla Corporation
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 /**
23 * @file
24 * Opus decoder/parser shared code
25 */
26
27 #include "libavutil/attributes.h"
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/error.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/log.h"
32 #include "libavutil/mem.h"
33
34 #include "avcodec.h"
35 #include "internal.h"
36 #include "mathops.h"
37 #include "opus.h"
38 #include "parse.h"
39 #include "vorbis_data.h"
40
41 static const uint16_t opus_frame_duration[32] = {
42 480, 960, 1920, 2880,
43 480, 960, 1920, 2880,
44 480, 960, 1920, 2880,
45 480, 960,
46 480, 960,
47 120, 240, 480, 960,
48 120, 240, 480, 960,
49 120, 240, 480, 960,
50 120, 240, 480, 960,
51 };
52
53 /**
54 * Read a 1- or 2-byte frame length
55 */
56 21825 static inline int xiph_lacing_16bit(const uint8_t **ptr, const uint8_t *end)
57 {
58 int val;
59
60
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 21825 if (*ptr >= end)
61 ✗ return AVERROR_INVALIDDATA;
62 21825 val = *(*ptr)++;
63
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 21825 if (val >= 252) {
64
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 898 if (*ptr >= end)
65 ✗ return AVERROR_INVALIDDATA;
66 898 val += 4 * *(*ptr)++;
67 }
68 21825 return val;
69 }
70
71 /**
72 * Read a multi-byte length (used for code 3 packet padding size)
73 */
74 1320 static inline int xiph_lacing_full(const uint8_t **ptr, const uint8_t *end)
75 {
76 1320 int val = 0;
77 int next;
78
79 while (1) {
80
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 1776 if (*ptr >= end || val > INT_MAX - 254)
81 ✗ return AVERROR_INVALIDDATA;
82 1776 next = *(*ptr)++;
83 1776 val += next;
84
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 1776 if (next < 255)
85 1320 break;
86 else
87 456 val--;
88 }
89 1320 return val;
90 }
91
92 /**
93 * Parse Opus packet info from raw packet data
94 */
95 49157 int ff_opus_parse_packet(OpusPacket *pkt, const uint8_t *buf, int buf_size,
96 int self_delimiting)
97 {
98 49157 const uint8_t *ptr = buf;
99 49157 const uint8_t *end = buf + buf_size;
100 49157 int padding = 0;
101 int frame_bytes, i;
102
103
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 49157 if (buf_size < 1)
104 ✗ goto fail;
105
106 /* TOC byte */
107 49157 i = *ptr++;
108 49157 pkt->code = (i ) & 0x3;
109 49157 pkt->stereo = (i >> 2) & 0x1;
110 49157 pkt->config = (i >> 3) & 0x1F;
111
112 /* code 2 and code 3 packets have at least 1 byte after the TOC */
113
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 49157 if (pkt->code >= 2 && buf_size < 2)
114 ✗ goto fail;
115
116
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 49157 switch (pkt->code) {
117 40317 case 0:
118 /* 1 frame */
119 40317 pkt->frame_count = 1;
120 40317 pkt->vbr = 0;
121
122
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 40317 if (self_delimiting) {
123 6901 int len = xiph_lacing_16bit(&ptr, end);
124
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 6901 if (len < 0 || len > end - ptr)
125 ✗ goto fail;
126 6901 end = ptr + len;
127 6901 buf_size = end - buf;
128 }
129
130 40317 frame_bytes = end - ptr;
131
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 40317 if (frame_bytes > OPUS_MAX_FRAME_SIZE)
132 ✗ goto fail;
133 40317 pkt->frame_offset[0] = ptr - buf;
134 40317 pkt->frame_size[0] = frame_bytes;
135 40317 break;
136 640 case 1:
137 /* 2 frames, equal size */
138 640 pkt->frame_count = 2;
139 640 pkt->vbr = 0;
140
141
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 640 if (self_delimiting) {
142 ✗ int len = xiph_lacing_16bit(&ptr, end);
143 ✗ if (len < 0 || 2 * len > end - ptr)
144 ✗ goto fail;
145 ✗ end = ptr + 2 * len;
146 ✗ buf_size = end - buf;
147 }
148
149 640 frame_bytes = end - ptr;
150
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 640 if (frame_bytes & 1 || frame_bytes >> 1 > OPUS_MAX_FRAME_SIZE)
151 ✗ goto fail;
152 640 pkt->frame_offset[0] = ptr - buf;
153 640 pkt->frame_size[0] = frame_bytes >> 1;
154 640 pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
155 640 pkt->frame_size[1] = frame_bytes >> 1;
156 640 break;
157 1998 case 2:
158 /* 2 frames, different sizes */
159 1998 pkt->frame_count = 2;
160 1998 pkt->vbr = 1;
161
162 /* read 1st frame size */
163 1998 frame_bytes = xiph_lacing_16bit(&ptr, end);
164
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 1998 if (frame_bytes < 0)
165 ✗ goto fail;
166
167
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 1998 if (self_delimiting) {
168 ✗ int len = xiph_lacing_16bit(&ptr, end);
169 ✗ if (len < 0 || len + frame_bytes > end - ptr)
170 ✗ goto fail;
171 ✗ end = ptr + frame_bytes + len;
172 ✗ buf_size = end - buf;
173 }
174
175 1998 pkt->frame_offset[0] = ptr - buf;
176 1998 pkt->frame_size[0] = frame_bytes;
177
178 /* calculate 2nd frame size */
179 1998 frame_bytes = end - ptr - pkt->frame_size[0];
180
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 1998 if (frame_bytes < 0 || frame_bytes > OPUS_MAX_FRAME_SIZE)
181 ✗ goto fail;
182 1998 pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
183 1998 pkt->frame_size[1] = frame_bytes;
184 1998 break;
185 6202 case 3:
186 /* 1 to 48 frames, can be different sizes */
187 6202 i = *ptr++;
188 6202 pkt->frame_count = (i ) & 0x3F;
189 6202 padding = (i >> 6) & 0x01;
190 6202 pkt->vbr = (i >> 7) & 0x01;
191
192
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 6202 if (pkt->frame_count == 0 || pkt->frame_count > OPUS_MAX_FRAMES)
193 ✗ goto fail;
194
195 /* read padding size */
196
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 6202 if (padding) {
197 1320 padding = xiph_lacing_full(&ptr, end);
198
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 1320 if (padding < 0)
199 ✗ goto fail;
200 }
201
202 /* read frame sizes */
203
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 6202 if (pkt->vbr) {
204 /* for VBR, all frames except the final one have their size coded
205 in the bitstream. the last frame size is implicit. */
206 4352 int total_bytes = 0;
207
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 17278 for (i = 0; i < pkt->frame_count - 1; i++) {
208 12926 frame_bytes = xiph_lacing_16bit(&ptr, end);
209
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 12926 if (frame_bytes < 0)
210 ✗ goto fail;
211 12926 pkt->frame_size[i] = frame_bytes;
212 12926 total_bytes += frame_bytes;
213 }
214
215
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 4352 if (self_delimiting) {
216 ✗ int len = xiph_lacing_16bit(&ptr, end);
217 ✗ if (len < 0 || len + total_bytes + padding > end - ptr)
218 ✗ goto fail;
219 ✗ end = ptr + total_bytes + len + padding;
220 ✗ buf_size = end - buf;
221 }
222
223 4352 frame_bytes = end - ptr - padding;
224
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 4352 if (total_bytes > frame_bytes)
225 ✗ goto fail;
226 4352 pkt->frame_offset[0] = ptr - buf;
227
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 17278 for (i = 1; i < pkt->frame_count; i++)
228 12926 pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
229 4352 pkt->frame_size[pkt->frame_count-1] = frame_bytes - total_bytes;
230 } else {
231 /* for CBR, the remaining packet bytes are divided evenly between
232 the frames */
233
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 1850 if (self_delimiting) {
234 ✗ frame_bytes = xiph_lacing_16bit(&ptr, end);
235 ✗ if (frame_bytes < 0 || pkt->frame_count * frame_bytes + padding > end - ptr)
236 ✗ goto fail;
237 ✗ end = ptr + pkt->frame_count * frame_bytes + padding;
238 ✗ buf_size = end - buf;
239 } else {
240 1850 frame_bytes = end - ptr - padding;
241
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 1850 if (frame_bytes % pkt->frame_count ||
242
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 1850 frame_bytes / pkt->frame_count > OPUS_MAX_FRAME_SIZE)
243 ✗ goto fail;
244 1850 frame_bytes /= pkt->frame_count;
245 }
246
247 1850 pkt->frame_offset[0] = ptr - buf;
248 1850 pkt->frame_size[0] = frame_bytes;
249
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 2630 for (i = 1; i < pkt->frame_count; i++) {
250 780 pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
251 780 pkt->frame_size[i] = frame_bytes;
252 }
253 }
254 }
255
256 49157 pkt->packet_size = buf_size;
257 49157 pkt->data_size = pkt->packet_size - padding;
258
259 /* total packet duration cannot be larger than 120ms */
260 49157 pkt->frame_duration = opus_frame_duration[pkt->config];
261
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 49157 if (pkt->frame_duration * pkt->frame_count > OPUS_MAX_PACKET_DUR)
262 ✗ goto fail;
263
264 /* set mode and bandwidth */
265
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 49157 if (pkt->config < 12) {
266 9060 pkt->mode = OPUS_MODE_SILK;
267 9060 pkt->bandwidth = pkt->config >> 2;
268
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 40097 } else if (pkt->config < 16) {
269 9851 pkt->mode = OPUS_MODE_HYBRID;
270
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 9851 pkt->bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND + (pkt->config >= 14);
271 } else {
272 30246 pkt->mode = OPUS_MODE_CELT;
273 30246 pkt->bandwidth = (pkt->config - 16) >> 2;
274 /* skip medium band */
275
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 30246 if (pkt->bandwidth)
276 26402 pkt->bandwidth++;
277 }
278
279 49157 return 0;
280
281 ✗ fail:
282 ✗ memset(pkt, 0, sizeof(*pkt));
283 ✗ return AVERROR_INVALIDDATA;
284 }
285
286 291 static int channel_reorder_vorbis(int nb_channels, int channel_idx)
287 {
288 291 return ff_vorbis_channel_layout_offsets[nb_channels - 1][channel_idx];
289 }
290
291 267 static int channel_reorder_unknown(int nb_channels, int channel_idx)
292 {
293 267 return channel_idx;
294 }
295
296 154 av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
297 OpusParseContext *s)
298 {
299 static const uint8_t default_channel_map[2] = { 0, 1 };
300
301 154 int (*channel_reorder)(int, int) = channel_reorder_unknown;
302 154 int channels = avctx->ch_layout.nb_channels;
303
304 const uint8_t *extradata, *channel_map;
305 int extradata_size;
306 int version, map_type, streams, stereo_streams, i, j, ret;
307 154 AVChannelLayout layout = { 0 };
308
309
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 154 if (!avctx->extradata) {
310
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 1 if (channels > 2) {
311 ✗ av_log(avctx, AV_LOG_ERROR,
312 "Multichannel configuration without extradata.\n");
313 ✗ return AVERROR(EINVAL);
314 }
315 1 extradata = opus_default_extradata;
316 1 extradata_size = sizeof(opus_default_extradata);
317 } else {
318 153 extradata = avctx->extradata;
319 153 extradata_size = avctx->extradata_size;
320 }
321
322
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 154 if (extradata_size < 19) {
323 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
324 extradata_size);
325 ✗ return AVERROR_INVALIDDATA;
326 }
327
328 154 version = extradata[8];
329
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 154 if (version > 15) {
330 ✗ avpriv_request_sample(avctx, "Extradata version %d", version);
331 ✗ return AVERROR_PATCHWELCOME;
332 }
333
334 154 avctx->delay = AV_RL16(extradata + 10);
335
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 154 if (avctx->internal)
336 126 avctx->internal->skip_samples = avctx->delay;
337
338
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 154 channels = avctx->extradata ? extradata[9] : (channels == 1) ? 1 : 2;
339
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 154 if (!channels) {
340 ✗ av_log(avctx, AV_LOG_ERROR, "Zero channel count specified in the extradata\n");
341 ✗ return AVERROR_INVALIDDATA;
342 }
343
344 154 s->gain_i = AV_RL16(extradata + 16);
345
346 154 map_type = extradata[18];
347
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 154 if (!map_type) {
348
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 143 if (channels > 2) {
349 ✗ av_log(avctx, AV_LOG_ERROR,
350 "Channel mapping 0 is only specified for up to 2 channels\n");
351 ✗ ret = AVERROR_INVALIDDATA;
352 ✗ goto fail;
353 }
354
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 143 layout = (channels == 1) ? (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO :
355 (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
356 143 streams = 1;
357 143 stereo_streams = channels - 1;
358 143 channel_map = default_channel_map;
359
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 11 } else if (map_type == 1 || map_type == 2 || map_type == 255) {
360
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 11 if (extradata_size < 21 + channels) {
361 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
362 extradata_size);
363 ✗ ret = AVERROR_INVALIDDATA;
364 ✗ goto fail;
365 }
366
367 11 streams = extradata[19];
368 11 stereo_streams = extradata[20];
369
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 11 if (!streams || stereo_streams > streams ||
370
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 11 streams + stereo_streams > 255) {
371 ✗ av_log(avctx, AV_LOG_ERROR,
372 "Invalid stream/stereo stream count: %d/%d\n", streams, stereo_streams);
373 ✗ ret = AVERROR_INVALIDDATA;
374 ✗ goto fail;
375 }
376
377
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 11 if (map_type == 1) {
378
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 11 if (channels > 8) {
379 ✗ av_log(avctx, AV_LOG_ERROR,
380 "Channel mapping 1 is only specified for up to 8 channels\n");
381 ✗ ret = AVERROR_INVALIDDATA;
382 ✗ goto fail;
383 }
384 11 av_channel_layout_copy(&layout, &ff_vorbis_ch_layouts[channels - 1]);
385 11 channel_reorder = channel_reorder_vorbis;
386 ✗ } else if (map_type == 2) {
387 ✗ int ambisonic_order = ff_sqrt(channels) - 1;
388 ✗ if (channels != ((ambisonic_order + 1) * (ambisonic_order + 1)) &&
389 ✗ channels != ((ambisonic_order + 1) * (ambisonic_order + 1) + 2)) {
390 ✗ av_log(avctx, AV_LOG_ERROR,
391 "Channel mapping 2 is only specified for channel counts"
392 " which can be written as (n + 1)^2 or (n + 1)^2 + 2"
393 " for nonnegative integer n\n");
394 ✗ ret = AVERROR_INVALIDDATA;
395 ✗ goto fail;
396 }
397 ✗ if (channels > 227) {
398 ✗ av_log(avctx, AV_LOG_ERROR, "Too many channels\n");
399 ✗ ret = AVERROR_INVALIDDATA;
400 ✗ goto fail;
401 }
402
403 ✗ layout.order = AV_CHANNEL_ORDER_AMBISONIC;
404 ✗ layout.nb_channels = channels;
405 ✗ if (channels != ((ambisonic_order + 1) * (ambisonic_order + 1)))
406 ✗ layout.u.mask = AV_CH_LAYOUT_STEREO;
407 } else {
408 ✗ layout.order = AV_CHANNEL_ORDER_UNSPEC;
409 ✗ layout.nb_channels = channels;
410 }
411
412 11 channel_map = extradata + 21;
413 } else {
414 ✗ avpriv_request_sample(avctx, "Mapping type %d", map_type);
415 ✗ return AVERROR_PATCHWELCOME;
416 }
417
418 154 s->channel_maps = av_calloc(channels, sizeof(*s->channel_maps));
419
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 154 if (!s->channel_maps) {
420 ✗ ret = AVERROR(ENOMEM);
421 ✗ goto fail;
422 }
423
424
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 433 for (i = 0; i < channels; i++) {
425 279 ChannelMap *map = &s->channel_maps[i];
426 279 uint8_t idx = channel_map[channel_reorder(channels, i)];
427
428
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 279 if (idx == 255) {
429 ✗ map->silence = 1;
430 ✗ continue;
431
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 279 } else if (idx >= streams + stereo_streams) {
432 ✗ av_log(avctx, AV_LOG_ERROR,
433 "Invalid channel map for output channel %d: %d\n", i, idx);
434 ✗ av_freep(&s->channel_maps);
435 ✗ ret = AVERROR_INVALIDDATA;
436 ✗ goto fail;
437 }
438
439 /* check that we did not see this index yet */
440 279 map->copy = 0;
441
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 558 for (j = 0; j < i; j++)
442
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 279 if (channel_map[channel_reorder(channels, j)] == idx) {
443 ✗ map->copy = 1;
444 ✗ map->copy_idx = j;
445 ✗ break;
446 }
447
448
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 279 if (idx < 2 * stereo_streams) {
449 176 map->stream_idx = idx / 2;
450 176 map->channel_idx = idx & 1;
451 } else {
452 103 map->stream_idx = idx - stereo_streams;
453 103 map->channel_idx = 0;
454 }
455 }
456
457 154 ret = av_channel_layout_copy(&avctx->ch_layout, &layout);
458
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 154 if (ret < 0)
459 ✗ goto fail;
460
461 154 s->nb_streams = streams;
462 154 s->nb_stereo_streams = stereo_streams;
463
464 154 return 0;
465 ✗ fail:
466 ✗ av_channel_layout_uninit(&layout);
467 ✗ return ret;
468 }
469