FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/oggparsevorbis.c
Date: 2025-06-23 20:06:14
Exec Total Coverage
Lines: 226 279 81.0%
Functions: 10 10 100.0%
Branches: 126 190 66.3%
Line Branch Exec Source
1 /*
2 * Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
3 *
4 * Permission is hereby granted, free of charge, to any person
5 * obtaining a copy of this software and associated documentation
6 * files (the "Software"), to deal in the Software without
7 * restriction, including without limitation the rights to use, copy,
8 * modify, merge, publish, distribute, sublicense, and/or sell copies
9 * of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 */
24
25 #include <stdlib.h>
26
27 #include "libavutil/avstring.h"
28 #include "libavutil/base64.h"
29 #include "libavutil/dict.h"
30 #include "libavutil/mem.h"
31
32 #include "libavcodec/bytestream.h"
33 #include "libavcodec/vorbis_parser.h"
34
35 #include "avformat.h"
36 #include "demux.h"
37 #include "flac_picture.h"
38 #include "internal.h"
39 #include "oggdec.h"
40 #include "vorbiscomment.h"
41 #include "replaygain.h"
42
43 194 static int ogm_chapter(AVFormatContext *as, const uint8_t *key, const uint8_t *val)
44 {
45 194 int i, cnum, h, m, s, ms, keylen = strlen(key);
46 194 AVChapter *chapter = NULL;
47
48
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 194 if (keylen < 9 || av_strncasecmp(key, "CHAPTER", 7) || sscanf(key+7, "%03d", &cnum) != 1)
49 170 return 0;
50
51
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 24 if (keylen <= 10) {
52
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 12 if (sscanf(val, "%02d:%02d:%02d.%03d", &h, &m, &s, &ms) < 4)
53 ✗ return 0;
54
55 12 avpriv_new_chapter(as, cnum, (AVRational) { 1, 1000 },
56 12 ms + 1000 * (s + 60 * (m + 60 * h)),
57 AV_NOPTS_VALUE, NULL);
58
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 12 } else if (!av_strcasecmp(key + keylen - 4, "NAME")) {
59
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 30 for (i = 0; i < as->nb_chapters; i++)
60
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 30 if (as->chapters[i]->id == cnum) {
61 12 chapter = as->chapters[i];
62 12 break;
63 }
64
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 12 if (!chapter)
65 ✗ return 0;
66
67 12 av_dict_set(&chapter->metadata, "title", val, 0);
68 } else
69 ✗ return 0;
70
71 24 return 1;
72 }
73
74 43 int ff_vorbis_stream_comment(AVFormatContext *as, AVStream *st,
75 const uint8_t *buf, int size)
76 {
77 43 int updates = ff_vorbis_comment(as, &st->metadata, buf, size, 1);
78
79
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 43 if (updates > 0) {
80 31 st->event_flags |= AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
81 }
82
83 43 return updates;
84 }
85
86 /**
87 * This function temporarily modifies the (const qualified) input buffer
88 * and reverts its changes before return. The input buffer needs to have
89 * at least one byte of padding.
90 */
91 201 static int vorbis_parse_single_comment(AVFormatContext *as, AVDictionary **m,
92 const uint8_t *buf, uint32_t size,
93 int *updates, int parse_picture)
94 {
95 201 char *t = (char*)buf, *v = memchr(t, '=', size);
96 int tl, vl;
97 char backup;
98
99
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 201 if (!v)
100 3 return 0;
101
102 198 tl = v - t;
103 198 vl = size - tl - 1;
104 198 v++;
105
106
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 198 if (!tl || !vl)
107 ✗ return 0;
108
109 198 t[tl] = 0;
110
111 198 backup = v[vl];
112 198 v[vl] = 0;
113
114 /* The format in which the pictures are stored is the FLAC format.
115 * Xiph says: "The binary FLAC picture structure is base64 encoded
116 * and placed within a VorbisComment with the tag name
117 * 'METADATA_BLOCK_PICTURE'. This is the preferred and
118 * recommended way of embedding cover art within VorbisComments."
119 */
120
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 202 if (!av_strcasecmp(t, "METADATA_BLOCK_PICTURE") && parse_picture) {
121 4 int ret, len = AV_BASE64_DECODE_SIZE(vl);
122 4 uint8_t *pict = av_malloc(len + AV_INPUT_BUFFER_PADDING_SIZE);
123
124
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 4 if (!pict) {
125 ✗ av_log(as, AV_LOG_WARNING, "out-of-memory error. Skipping cover art block.\n");
126 ✗ goto end;
127 }
128 4 ret = av_base64_decode(pict, v, len);
129
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 4 if (ret > 0)
130 4 ret = ff_flac_parse_picture(as, &pict, ret, 0);
131 4 av_freep(&pict);
132
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 4 if (ret < 0) {
133 ✗ av_log(as, AV_LOG_WARNING, "Failed to parse cover art block.\n");
134 ✗ goto end;
135 }
136
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 194 } else if (!ogm_chapter(as, t, v)) {
137 170 (*updates)++;
138
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 170 if (av_dict_get(*m, t, NULL, 0))
139 ✗ av_dict_set(m, t, ";", AV_DICT_APPEND);
140 170 av_dict_set(m, t, v, AV_DICT_APPEND);
141 }
142 24 end:
143 198 t[tl] = '=';
144 198 v[vl] = backup;
145
146 198 return 0;
147 }
148
149 82 int ff_vorbis_comment(AVFormatContext *as, AVDictionary **m,
150 const uint8_t *buf, int size,
151 int parse_picture)
152 {
153 82 const uint8_t *p = buf;
154 82 const uint8_t *end = buf + size;
155 82 int updates = 0;
156 unsigned n;
157 int s, ret;
158
159 /* must have vendor_length and user_comment_list_length */
160
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 82 if (size < 8)
161 ✗ return AVERROR_INVALIDDATA;
162
163 82 s = bytestream_get_le32(&p);
164
165
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 82 if (end - p - 4 < s || s < 0)
166 ✗ return AVERROR_INVALIDDATA;
167
168 82 p += s;
169
170 82 n = bytestream_get_le32(&p);
171
172
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 283 while (end - p >= 4 && n > 0) {
173 201 s = bytestream_get_le32(&p);
174
175
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 201 if (end - p < s || s < 0)
176 break;
177
178 201 ret = vorbis_parse_single_comment(as, m, p, s, &updates, parse_picture);
179
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 201 if (ret < 0)
180 ✗ return ret;
181 201 p += s;
182 201 n--;
183 }
184
185
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 82 if (p != end)
186 4 av_log(as, AV_LOG_INFO,
187 "%"PTRDIFF_SPECIFIER" bytes of comment header remain\n", end - p);
188
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 82 if (n > 0)
189 ✗ av_log(as, AV_LOG_INFO,
190 "truncated comment header, %i comments not found\n", n);
191
192 82 ff_metadata_conv(m, NULL, ff_vorbiscomment_metadata_conv);
193
194 82 return updates;
195 }
196
197 /*
198 * Parse the vorbis header
199 *
200 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
201 * [vorbis_version] = read 32 bits as unsigned integer | Not used
202 * [audio_channels] = read 8 bit integer as unsigned | Used
203 * [audio_sample_rate] = read 32 bits as unsigned integer | Used
204 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
205 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
206 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
207 * [blocksize_0] = read 4 bits as unsigned integer | Not Used
208 * [blocksize_1] = read 4 bits as unsigned integer | Not Used
209 * [framing_flag] = read one bit | Not Used
210 */
211
212 struct oggvorbis_private {
213 unsigned int len[3];
214 unsigned char *packet[3];
215 AVVorbisParseContext *vp;
216 int64_t final_pts;
217 int final_duration;
218 };
219
220 28 static int fixup_vorbis_headers(AVFormatContext *as,
221 struct oggvorbis_private *priv,
222 uint8_t **buf)
223 {
224 int i, offset, len, err;
225 int buf_len;
226 unsigned char *ptr;
227
228 28 len = priv->len[0] + priv->len[1] + priv->len[2];
229 28 buf_len = len + len / 255 + 64;
230
231
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 28 if (*buf)
232 ✗ return AVERROR_INVALIDDATA;
233
234 28 ptr = *buf = av_realloc(NULL, buf_len);
235
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 28 if (!ptr)
236 ✗ return AVERROR(ENOMEM);
237 28 memset(*buf, '\0', buf_len);
238
239 28 ptr[0] = 2;
240 28 offset = 1;
241 28 offset += av_xiphlacing(&ptr[offset], priv->len[0]);
242 28 offset += av_xiphlacing(&ptr[offset], priv->len[1]);
243
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 112 for (i = 0; i < 3; i++) {
244 84 memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
245 84 offset += priv->len[i];
246 84 av_freep(&priv->packet[i]);
247 }
248
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 28 if ((err = av_reallocp(buf, offset + AV_INPUT_BUFFER_PADDING_SIZE)) < 0)
249 ✗ return err;
250 28 return offset;
251 }
252
253 28 static void vorbis_cleanup(AVFormatContext *s, int idx)
254 {
255 28 struct ogg *ogg = s->priv_data;
256 28 struct ogg_stream *os = ogg->streams + idx;
257 28 struct oggvorbis_private *priv = os->private;
258 int i;
259
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 28 if (os->private) {
260 28 av_vorbis_parse_free(&priv->vp);
261
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 112 for (i = 0; i < 3; i++)
262 84 av_freep(&priv->packet[i]);
263 }
264 28 }
265
266 30 static int vorbis_update_metadata(AVFormatContext *s, int idx)
267 {
268 30 struct ogg *ogg = s->priv_data;
269 30 struct ogg_stream *os = ogg->streams + idx;
270 30 AVStream *st = s->streams[idx];
271 int ret;
272
273
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 30 if (os->psize <= 8)
274 ✗ return 0;
275
276 /* New metadata packet; release old data. */
277 30 av_dict_free(&st->metadata);
278 30 ret = ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 7,
279 30 os->psize - 8);
280
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 30 if (ret < 0)
281 ✗ return ret;
282
283 /* Update the metadata if possible. */
284 30 av_freep(&os->new_metadata);
285
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 30 if (st->metadata) {
286 20 os->new_metadata = av_packet_pack_dictionary(st->metadata, &os->new_metadata_size);
287 /* Send an empty dictionary to indicate that metadata has been cleared. */
288 } else {
289 10 os->new_metadata = av_mallocz(1);
290 10 os->new_metadata_size = 0;
291 }
292
293 30 return ret;
294 }
295
296 28 static int vorbis_parse_header(AVFormatContext *s, AVStream *st,
297 const uint8_t *p, unsigned int psize)
298 {
299 unsigned blocksize, bs0, bs1;
300 int srate;
301 int channels;
302
303
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 28 if (psize != 30)
304 ✗ return AVERROR_INVALIDDATA;
305
306 28 p += 7; /* skip "\001vorbis" tag */
307
308
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 28 if (bytestream_get_le32(&p) != 0) /* vorbis_version */
309 ✗ return AVERROR_INVALIDDATA;
310
311 28 channels = bytestream_get_byte(&p);
312
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 28 if (st->codecpar->ch_layout.nb_channels &&
313 ✗ channels != st->codecpar->ch_layout.nb_channels) {
314 ✗ av_log(s, AV_LOG_ERROR, "Channel change is not supported\n");
315 ✗ return AVERROR_PATCHWELCOME;
316 }
317 28 st->codecpar->ch_layout.nb_channels = channels;
318 28 srate = bytestream_get_le32(&p);
319 28 p += 4; // skip maximum bitrate
320 28 st->codecpar->bit_rate = bytestream_get_le32(&p); // nominal bitrate
321 28 p += 4; // skip minimum bitrate
322
323 28 blocksize = bytestream_get_byte(&p);
324 28 bs0 = blocksize & 15;
325 28 bs1 = blocksize >> 4;
326
327
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 28 if (bs0 > bs1)
328 ✗ return AVERROR_INVALIDDATA;
329
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 28 if (bs0 < 6 || bs1 > 13)
330 ✗ return AVERROR_INVALIDDATA;
331
332
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 28 if (bytestream_get_byte(&p) != 1) /* framing_flag */
333 ✗ return AVERROR_INVALIDDATA;
334
335 28 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
336 28 st->codecpar->codec_id = AV_CODEC_ID_VORBIS;
337
338
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 28 if (srate > 0) {
339
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 28 if (st->codecpar->sample_rate &&
340 ✗ srate != st->codecpar->sample_rate) {
341 ✗ av_log(s, AV_LOG_ERROR, "Sample rate change is not supported\n");
342 ✗ return AVERROR_PATCHWELCOME;
343 }
344
345 28 st->codecpar->sample_rate = srate;
346 28 avpriv_set_pts_info(st, 64, 1, srate);
347 }
348
349 28 return 1;
350 }
351
352 113 static int vorbis_header(AVFormatContext *s, int idx)
353 {
354 113 struct ogg *ogg = s->priv_data;
355 113 AVStream *st = s->streams[idx];
356 113 struct ogg_stream *os = ogg->streams + idx;
357 struct oggvorbis_private *priv;
358 113 int pkt_type = os->buf[os->pstart];
359
360
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 113 if (!os->private) {
361 28 os->private = av_mallocz(sizeof(struct oggvorbis_private));
362
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 28 if (!os->private)
363 ✗ return AVERROR(ENOMEM);
364 }
365
366 113 priv = os->private;
367
368
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 113 if (!(pkt_type & 1))
369
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 29 return priv->vp ? 0 : AVERROR_INVALIDDATA;
370
371
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 84 if (pkt_type > 5) {
372 ✗ av_log(s, AV_LOG_VERBOSE, "Ignoring packet with unknown type %d\n", pkt_type);
373 ✗ return 1;
374 }
375
376
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 84 if (os->psize < 1)
377 ✗ return AVERROR_INVALIDDATA;
378
379
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 84 if (priv->packet[pkt_type >> 1])
380 ✗ return AVERROR_INVALIDDATA;
381
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 84 if (pkt_type > 1 && !priv->packet[0] || pkt_type > 3 && !priv->packet[1])
382 ✗ return priv->vp ? 0 : AVERROR_INVALIDDATA;
383
384 84 priv->len[pkt_type >> 1] = os->psize;
385 84 priv->packet[pkt_type >> 1] = av_memdup(os->buf + os->pstart, os->psize);
386
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 84 if (!priv->packet[pkt_type >> 1])
387 ✗ return AVERROR(ENOMEM);
388
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 84 if (pkt_type == 1)
389 28 return vorbis_parse_header(s, st, os->buf + os->pstart, os->psize);
390
391
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 56 if (pkt_type == 3) {
392
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 28 if (vorbis_update_metadata(s, idx) >= 0 && priv->len[1] > 10) {
393 unsigned new_len;
394
395 28 int ret = ff_replaygain_export(st, st->metadata);
396
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 28 if (ret < 0)
397 ✗ return ret;
398
399 // drop all metadata we parsed and which is not required by libvorbis
400 28 new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1;
401
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 28 if (new_len >= 16 && new_len < os->psize) {
402 20 AV_WL32(priv->packet[1] + new_len - 5, 0);
403 20 priv->packet[1][new_len - 1] = 1;
404 20 priv->len[1] = new_len;
405 }
406 }
407 } else {
408 int ret;
409
410
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 28 if (priv->vp)
411 ✗ return AVERROR_INVALIDDATA;
412
413 28 ret = fixup_vorbis_headers(s, priv, &st->codecpar->extradata);
414
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 28 if (ret < 0) {
415 ✗ st->codecpar->extradata_size = 0;
416 ✗ return ret;
417 }
418 28 st->codecpar->extradata_size = ret;
419
420 28 priv->vp = av_vorbis_parse_init(st->codecpar->extradata, st->codecpar->extradata_size);
421
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 28 if (!priv->vp) {
422 ✗ av_freep(&st->codecpar->extradata);
423 ✗ st->codecpar->extradata_size = 0;
424 ✗ return AVERROR_UNKNOWN;
425 }
426 }
427
428 56 return 1;
429 }
430
431 11113 static int vorbis_packet(AVFormatContext *s, int idx)
432 {
433 11113 struct ogg *ogg = s->priv_data;
434 11113 struct ogg_stream *os = ogg->streams + idx;
435 11113 struct oggvorbis_private *priv = os->private;
436 11113 int duration, flags = 0;
437
438
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 11113 if (!priv->vp)
439 ✗ return AVERROR_INVALIDDATA;
440
441 /* first packet handling
442 * here we parse the duration of each packet in the first page and compare
443 * the total duration to the page granule to find the encoder delay and
444 * set the first timestamp */
445
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 11113 if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS) && (int64_t)os->granule>=0) {
446 int seg, d;
447 10333 uint8_t *last_pkt = os->buf + os->pstart;
448 10333 uint8_t *next_pkt = last_pkt;
449
450 10333 av_vorbis_parse_reset(priv->vp);
451 10333 duration = 0;
452 10333 seg = os->segp;
453 10333 d = av_vorbis_parse_frame_flags(priv->vp, last_pkt, 1, &flags);
454
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 10333 if (d < 0) {
455 ✗ os->pflags |= AV_PKT_FLAG_CORRUPT;
456 ✗ return 0;
457
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 10333 } else if (flags & VORBIS_FLAG_COMMENT) {
458 1 vorbis_update_metadata(s, idx);
459 1 flags = 0;
460 }
461 10333 duration += d;
462 10333 last_pkt = next_pkt = next_pkt + os->psize;
463
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 203070 for (; seg < os->nsegs; seg++) {
464
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 192737 if (os->segments[seg] < 255) {
465 143343 int d = av_vorbis_parse_frame_flags(priv->vp, last_pkt, 1, &flags);
466
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 143343 if (d < 0) {
467 ✗ duration = os->granule;
468 ✗ break;
469
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 143343 } else if (flags & VORBIS_FLAG_COMMENT) {
470 ✗ vorbis_update_metadata(s, idx);
471 ✗ flags = 0;
472 }
473 143343 duration += d;
474 143343 last_pkt = next_pkt + os->segments[seg];
475 }
476 192737 next_pkt += os->segments[seg];
477 }
478 10333 os->lastpts =
479 10333 os->lastdts = os->granule - duration;
480
481
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 10333 if (!os->granule && duration) //hack to deal with broken files (Ticket3710)
482 ✗ os->lastpts = os->lastdts = AV_NOPTS_VALUE;
483
484
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 10333 if (s->streams[idx]->start_time == AV_NOPTS_VALUE) {
485 27 s->streams[idx]->start_time = FFMAX(os->lastpts, 0);
486
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 27 if (s->streams[idx]->duration != AV_NOPTS_VALUE)
487 27 s->streams[idx]->duration -= s->streams[idx]->start_time;
488 }
489 10333 priv->final_pts = AV_NOPTS_VALUE;
490 10333 av_vorbis_parse_reset(priv->vp);
491 }
492
493 /* parse packet duration */
494
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 11113 if (os->psize > 0) {
495 11113 duration = av_vorbis_parse_frame_flags(priv->vp, os->buf + os->pstart, 1, &flags);
496
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 11113 if (duration < 0) {
497 ✗ os->pflags |= AV_PKT_FLAG_CORRUPT;
498 ✗ return 0;
499
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 11113 } else if (flags & VORBIS_FLAG_COMMENT) {
500 1 vorbis_update_metadata(s, idx);
501 1 flags = 0;
502 }
503 11113 os->pduration = duration;
504 }
505
506 /* final packet handling
507 * here we save the pts of the first packet in the final page, sum up all
508 * packet durations in the final page except for the last one, and compare
509 * to the page granule to find the duration of the final packet */
510
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 11113 if (os->flags & OGG_FLAG_EOS) {
511
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 138 if (os->lastpts != AV_NOPTS_VALUE) {
512 8 priv->final_pts = os->lastpts;
513 8 priv->final_duration = 0;
514 }
515
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 138 if (os->segp == os->nsegs) {
516 7 int64_t skip = priv->final_pts + priv->final_duration + os->pduration - os->granule;
517
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 7 if (skip > 0)
518 7 os->end_trimming = skip;
519 7 os->pduration = os->granule - priv->final_pts - priv->final_duration;
520 }
521 138 priv->final_duration += os->pduration;
522 }
523
524 11113 return 0;
525 }
526
527 const struct ogg_codec ff_vorbis_codec = {
528 .magic = "\001vorbis",
529 .magicsize = 7,
530 .header = vorbis_header,
531 .packet = vorbis_packet,
532 .cleanup = vorbis_cleanup,
533 .nb_header = 3,
534 };
535