FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/isom.c
Date: 2026-08-29 16:27:19
Exec Total Coverage
Lines: 100 112 89.3%
Functions: 7 7 100.0%
Branches: 55 74 74.3%
Line Branch Exec Source
1 /*
2 * ISO Media common code
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002 Francois Revol <revol@free.fr>
5 * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #include "avformat.h"
25 #include "demux.h"
26 #include "internal.h"
27 #include "isom.h"
28 #include "libavcodec/mpeg4audio.h"
29 #include "libavcodec/mpegaudiodata.h"
30 #include "libavutil/channel_layout.h"
31
32 /* http://www.mp4ra.org */
33 /* ordered by muxing preference */
34 const AVCodecTag ff_mp4_obj_type[] = {
35 { AV_CODEC_ID_MOV_TEXT , 0x08 },
36 { AV_CODEC_ID_MPEG4 , 0x20 },
37 { AV_CODEC_ID_H264 , 0x21 },
38 { AV_CODEC_ID_HEVC , 0x23 },
39 { AV_CODEC_ID_VVC , 0x33 },
40 { AV_CODEC_ID_AAC , 0x40 },
41 { AV_CODEC_ID_MP4ALS , 0x40 }, /* 14496-3 ALS */
42 { AV_CODEC_ID_MPEG2VIDEO , 0x61 }, /* MPEG-2 Main */
43 { AV_CODEC_ID_MPEG2VIDEO , 0x60 }, /* MPEG-2 Simple */
44 { AV_CODEC_ID_MPEG2VIDEO , 0x62 }, /* MPEG-2 SNR */
45 { AV_CODEC_ID_MPEG2VIDEO , 0x63 }, /* MPEG-2 Spatial */
46 { AV_CODEC_ID_MPEG2VIDEO , 0x64 }, /* MPEG-2 High */
47 { AV_CODEC_ID_MPEG2VIDEO , 0x65 }, /* MPEG-2 422 */
48 { AV_CODEC_ID_AAC , 0x66 }, /* MPEG-2 AAC Main */
49 { AV_CODEC_ID_AAC , 0x67 }, /* MPEG-2 AAC Low */
50 { AV_CODEC_ID_AAC , 0x68 }, /* MPEG-2 AAC SSR */
51 { AV_CODEC_ID_MP3 , 0x69 }, /* 13818-3 */
52 { AV_CODEC_ID_MP2 , 0x69 }, /* 11172-3 */
53 { AV_CODEC_ID_MPEG1VIDEO , 0x6A }, /* 11172-2 */
54 { AV_CODEC_ID_MP3 , 0x6B }, /* 11172-3 */
55 { AV_CODEC_ID_MJPEG , 0x6C }, /* 10918-1 */
56 { AV_CODEC_ID_PNG , 0x6D },
57 { AV_CODEC_ID_JPEG2000 , 0x6E }, /* 15444-1 */
58 { AV_CODEC_ID_VC1 , 0xA3 },
59 { AV_CODEC_ID_DIRAC , 0xA4 },
60 { AV_CODEC_ID_AC3 , 0xA5 },
61 { AV_CODEC_ID_EAC3 , 0xA6 },
62 { AV_CODEC_ID_DTS , 0xA9 }, /* mp4ra.org */
63 { AV_CODEC_ID_OPUS , 0xAD }, /* mp4ra.org */
64 { AV_CODEC_ID_VP9 , 0xB1 }, /* mp4ra.org */
65 { AV_CODEC_ID_TSCC2 , 0xD0 }, /* nonstandard, camtasia uses it */
66 { AV_CODEC_ID_EVRC , 0xD1 }, /* nonstandard, pvAuthor uses it */
67 { AV_CODEC_ID_VORBIS , 0xDD }, /* nonstandard, gpac uses it */
68 { AV_CODEC_ID_DVD_SUBTITLE, 0xE0 }, /* nonstandard, see unsupported-embedded-subs-2.mp4 */
69 { AV_CODEC_ID_QCELP , 0xE1 },
70 { AV_CODEC_ID_MPEG4SYSTEMS, 0x01 },
71 { AV_CODEC_ID_MPEG4SYSTEMS, 0x02 },
72 { AV_CODEC_ID_NONE , 0 },
73 };
74
75 const AVCodecTag ff_codec_movsubtitle_tags[] = {
76 { AV_CODEC_ID_MOV_TEXT, MKTAG('t', 'e', 'x', 't') },
77 { AV_CODEC_ID_MOV_TEXT, MKTAG('t', 'x', '3', 'g') },
78 { AV_CODEC_ID_EIA_608, MKTAG('c', '6', '0', '8') },
79 { AV_CODEC_ID_NONE, 0 },
80 };
81
82 const AVCodecTag ff_codec_movdata_tags[] = {
83 { AV_CODEC_ID_BIN_DATA, MKTAG('g', 'p', 'm', 'd') },
84 { AV_CODEC_ID_ITUT_T35, MKTAG('i', 't', '3', '5') },
85 { AV_CODEC_ID_NONE, 0 },
86 };
87
88 /* map numeric codes from mdhd atom to ISO 639 */
89 /* cf. QTFileFormat.pdf p253, qtff.pdf p205 */
90 /* http://developer.apple.com/documentation/mac/Text/Text-368.html */
91 /* deprecated by putting the code as 3*5 bits ASCII */
92 static const char mov_mdhd_language_map[][4] = {
93 "eng", /* 0 English */
94 "fra", /* 1 French */
95 "ger", /* 2 German */
96 "ita", /* 3 Italian */
97 "dut", /* 4 Dutch */
98 "sve", /* 5 Swedish */
99 "spa", /* 6 Spanish */
100 "dan", /* 7 Danish */
101 "por", /* 8 Portuguese */
102 "nor", /* 9 Norwegian */
103 "heb", /* 10 Hebrew */
104 "jpn", /* 11 Japanese */
105 "ara", /* 12 Arabic */
106 "fin", /* 13 Finnish */
107 "gre", /* 14 Greek */
108 "ice", /* 15 Icelandic */
109 "mlt", /* 16 Maltese */
110 "tur", /* 17 Turkish */
111 "hr ", /* 18 Croatian */
112 "chi", /* 19 Traditional Chinese */
113 "urd", /* 20 Urdu */
114 "hin", /* 21 Hindi */
115 "tha", /* 22 Thai */
116 "kor", /* 23 Korean */
117 "lit", /* 24 Lithuanian */
118 "pol", /* 25 Polish */
119 "hun", /* 26 Hungarian */
120 "est", /* 27 Estonian */
121 "lav", /* 28 Latvian */
122 "smi", /* 29 Sami */
123 "fo ", /* 30 Faroese */
124 "per", /* 31 Farsi */
125 "rus", /* 32 Russian */
126 "chi", /* 33 Simplified Chinese */
127 "", /* 34 Flemish */
128 "iri", /* 35 Irish */
129 "alb", /* 36 Albanian */
130 "ron", /* 37 Romanian */
131 "ces", /* 38 Czech */
132 "slk", /* 39 Slovak */
133 "slv", /* 40 Slovenian */
134 "yid", /* 41 Yiddish */
135 "sr ", /* 42 Serbian */
136 "mac", /* 43 Macedonian */
137 "bul", /* 44 Bulgarian */
138 "ukr", /* 45 Ukrainian */
139 "bel", /* 46 Belarusian */
140 "uzb", /* 47 Uzbek */
141 "kaz", /* 48 Kazakh */
142 "aze", /* 49 Azerbaijani */
143 "aze", /* 50 AzerbaijanAr */
144 "arm", /* 51 Armenian */
145 "geo", /* 52 Georgian */
146 "mol", /* 53 Moldavian */
147 "kir", /* 54 Kirghiz */
148 "tgk", /* 55 Tajiki */
149 "tuk", /* 56 Turkmen */
150 "mon", /* 57 Mongolian */
151 "", /* 58 MongolianCyr */
152 "pus", /* 59 Pashto */
153 "kur", /* 60 Kurdish */
154 "kas", /* 61 Kashmiri */
155 "snd", /* 62 Sindhi */
156 "tib", /* 63 Tibetan */
157 "nep", /* 64 Nepali */
158 "san", /* 65 Sanskrit */
159 "mar", /* 66 Marathi */
160 "ben", /* 67 Bengali */
161 "asm", /* 68 Assamese */
162 "guj", /* 69 Gujarati */
163 "pa ", /* 70 Punjabi */
164 "ori", /* 71 Oriya */
165 "mal", /* 72 Malayalam */
166 "kan", /* 73 Kannada */
167 "tam", /* 74 Tamil */
168 "tel", /* 75 Telugu */
169 "sin", /* 76 Sinhala */
170 "bur", /* 77 Burmese */
171 "khm", /* 78 Khmer */
172 "lao", /* 79 Lao */
173 "vie", /* 80 Vietnamese */
174 "ind", /* 81 Indonesian */
175 "tgl", /* 82 Tagalog */
176 "may", /* 83 MalayRoman */
177 "may", /* 84 MalayArabic */
178 "amh", /* 85 Amharic */
179 "tir", /* 86 Galla */
180 "orm", /* 87 Oromo */
181 "som", /* 88 Somali */
182 "swa", /* 89 Swahili */
183 "kin", /* 90 Kinyarwanda */
184 "run", /* 91 Rundi */
185 "nya", /* 92 Nyanja */
186 "mlg", /* 93 Malagasy */
187 "epo", /* 94 Esperanto */
188 "", /* 95 */
189 "", /* 96 */
190 "", /* 97 */
191 "", /* 98 */
192 "", /* 99 */
193 "", /* 100 */
194 "", /* 101 */
195 "", /* 102 */
196 "", /* 103 */
197 "", /* 104 */
198 "", /* 105 */
199 "", /* 106 */
200 "", /* 107 */
201 "", /* 108 */
202 "", /* 109 */
203 "", /* 110 */
204 "", /* 111 */
205 "", /* 112 */
206 "", /* 113 */
207 "", /* 114 */
208 "", /* 115 */
209 "", /* 116 */
210 "", /* 117 */
211 "", /* 118 */
212 "", /* 119 */
213 "", /* 120 */
214 "", /* 121 */
215 "", /* 122 */
216 "", /* 123 */
217 "", /* 124 */
218 "", /* 125 */
219 "", /* 126 */
220 "", /* 127 */
221 "wel", /* 128 Welsh */
222 "baq", /* 129 Basque */
223 "cat", /* 130 Catalan */
224 "lat", /* 131 Latin */
225 "que", /* 132 Quechua */
226 "grn", /* 133 Guarani */
227 "aym", /* 134 Aymara */
228 "tat", /* 135 Tatar */
229 "uig", /* 136 Uighur */
230 "dzo", /* 137 Dzongkha */
231 "jav", /* 138 JavaneseRom */
232 };
233
234 354 int ff_mov_iso639_to_lang(const char lang[4], int mp4)
235 {
236 354 int i, code = 0;
237
238 /* old way, only for QT? */
239
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 22316 for (i = 0; lang[0] && !mp4 && i < FF_ARRAY_ELEMS(mov_mdhd_language_map); i++) {
240
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 21974 if (!strcmp(lang, mov_mdhd_language_map[i]))
241 12 return i;
242 }
243 /* XXX:can we do that in mov too? */
244
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 342 if (!mp4)
245 158 return -1;
246 /* handle undefined as such */
247
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 184 if (lang[0] == '\0')
248 ✗ lang = "und";
249 /* 5 bits ASCII */
250
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 736 for (i = 0; i < 3; i++) {
251 552 uint8_t c = lang[i];
252 552 c -= 0x60;
253
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 552 if (c > 0x1f)
254 ✗ return -1;
255 552 code <<= 5;
256 552 code |= c;
257 }
258 184 return code;
259 }
260
261 777 int ff_mov_lang_to_iso639(unsigned code, char to[4])
262 {
263 int i;
264 777 memset(to, 0, 4);
265 /* is it the mangled iso code? */
266 /* see http://www.geocities.com/xhelmboyx/quicktime/formats/mp4-layout.txt */
267
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 777 if (code >= 0x400 && code != 0x7fff) {
268
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 1552 for (i = 2; i >= 0; i--) {
269 1164 to[i] = 0x60 + (code & 0x1f);
270 1164 code >>= 5;
271 }
272 388 return 1;
273 }
274 /* old fashion apple lang code */
275
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 389 if (code >= FF_ARRAY_ELEMS(mov_mdhd_language_map))
276 174 return 0;
277
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 215 if (!mov_mdhd_language_map[code][0])
278 ✗ return 0;
279 215 memcpy(to, mov_mdhd_language_map[code], 4);
280 215 return 1;
281 }
282
283 1105 int ff_mp4_read_descr_len(AVIOContext *pb)
284 {
285 1105 int len = 0;
286 1105 int count = 4;
287
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 2784 while (count--) {
288 2784 int c = avio_r8(pb);
289 2784 len = (len << 7) | (c & 0x7f);
290
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 2784 if (!(c & 0x80))
291 1105 break;
292 }
293 1105 return len;
294 }
295
296 565 int ff_mp4_read_descr(void *logctx, AVIOContext *pb, int *tag)
297 {
298 int len;
299 565 *tag = avio_r8(pb);
300 565 len = ff_mp4_read_descr_len(pb);
301 565 av_log(logctx, AV_LOG_TRACE, "MPEG-4 description: tag=0x%02x len=%d\n", *tag, len);
302 565 return len;
303 }
304
305 187 void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id)
306 {
307 int flags;
308
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 187 if (es_id) *es_id = avio_rb16(pb);
309 187 else avio_rb16(pb);
310 187 flags = avio_r8(pb);
311
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 187 if (flags & 0x80) //streamDependenceFlag
312 ✗ avio_rb16(pb);
313
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 187 if (flags & 0x40) { //URL_Flag
314 ✗ int len = avio_r8(pb);
315 ✗ avio_skip(pb, len);
316 }
317
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 187 if (flags & 0x20) //OCRstreamFlag
318 ✗ avio_rb16(pb);
319 187 }
320
321 static const AVCodecTag mp4_audio_types[] = {
322 { AV_CODEC_ID_MP3ON4, AOT_PS }, /* old mp3on4 draft */
323 { AV_CODEC_ID_MP3ON4, AOT_L1 }, /* layer 1 */
324 { AV_CODEC_ID_MP3ON4, AOT_L2 }, /* layer 2 */
325 { AV_CODEC_ID_MP3ON4, AOT_L3 }, /* layer 3 */
326 { AV_CODEC_ID_MP4ALS, AOT_ALS }, /* MPEG-4 ALS */
327 { AV_CODEC_ID_NONE, AOT_NULL },
328 };
329
330 187 int ff_mp4_read_dec_config_descr(void *logctx, AVStream *st, AVIOContext *pb)
331 {
332 enum AVCodecID codec_id;
333 int len, tag;
334 int ret;
335 187 int object_type_id = avio_r8(pb);
336 187 avio_r8(pb); /* stream type */
337 187 avio_rb24(pb); /* buffer size db */
338 187 avio_rb32(pb); /* rc_max_rate */
339
340 187 st->codecpar->bit_rate = avio_rb32(pb); /* avg bitrate */
341
342 187 codec_id= ff_codec_get_id(ff_mp4_obj_type, object_type_id);
343
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 187 if (codec_id)
344 187 st->codecpar->codec_id = codec_id;
345 187 av_log(logctx, AV_LOG_TRACE, "esds object type id 0x%02x\n", object_type_id);
346 187 len = ff_mp4_read_descr(logctx, pb, &tag);
347
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 187 if (tag == MP4DecSpecificDescrTag) {
348 180 av_log(logctx, AV_LOG_TRACE, "Specific MPEG-4 header len=%d\n", len);
349 /* As per 14496-3:2009 9.D.2.2, No decSpecificInfo is defined
350 for MPEG-1 Audio or MPEG-2 Audio; MPEG-2 AAC excluded. */
351
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 180 if (object_type_id == 0x69 || object_type_id == 0x6b)
352 ✗ return 0;
353
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 180 if (!len || (uint64_t)len > (1<<30))
354 ✗ return AVERROR_INVALIDDATA;
355
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 180 if ((ret = ff_get_extradata(logctx, st->codecpar, pb, len)) < 0)
356 ✗ return ret;
357
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 180 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
358 151 MPEG4AudioConfig cfg = {0};
359 151 ret = avpriv_mpeg4audio_get_config2(&cfg, st->codecpar->extradata,
360 151 st->codecpar->extradata_size, 1, logctx);
361
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 151 if (ret < 0)
362 ✗ return ret;
363
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 151 if (cfg.channels != st->codecpar->ch_layout.nb_channels) {
364 54 av_channel_layout_uninit(&st->codecpar->ch_layout);
365 54 st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
366 54 st->codecpar->ch_layout.nb_channels = cfg.channels;
367 }
368
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 151 if (cfg.object_type == 29 && cfg.sampling_index < 3) // old mp3on4
369 ✗ st->codecpar->sample_rate = ff_mpa_freq_tab[cfg.sampling_index];
370
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 151 else if (cfg.ext_sample_rate)
371 30 st->codecpar->sample_rate = cfg.ext_sample_rate;
372 else
373 121 st->codecpar->sample_rate = cfg.sample_rate;
374
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 151 switch (cfg.object_type) {
375 144 case AOT_AAC_MAIN:
376 case AOT_AAC_LC:
377 case AOT_AAC_SSR:
378 case AOT_AAC_LTP:
379 case AOT_ER_AAC_LC:
380 case AOT_ER_AAC_LD:
381 case AOT_ER_AAC_ELD:
382 case AOT_USAC:
383 144 st->codecpar->frame_size = cfg.frame_length;
384 144 break;
385 }
386 151 av_log(logctx, AV_LOG_TRACE, "mp4a config channels %d obj %d ext obj %d "
387 "sample rate %d ext sample rate %d frame_length %d\n", cfg.channels,
388 cfg.object_type, cfg.ext_object_type,
389 cfg.sample_rate, cfg.ext_sample_rate,
390 cfg.frame_length);
391
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 151 if (!(st->codecpar->codec_id = ff_codec_get_id(mp4_audio_types,
392 151 cfg.object_type)))
393 144 st->codecpar->codec_id = AV_CODEC_ID_AAC;
394 }
395 }
396 187 return 0;
397 }
398
399 typedef struct MovChannelLayout {
400 int64_t channel_layout;
401 uint32_t layout_tag;
402 } MovChannelLayout;
403
404 static const MovChannelLayout mov_channel_layout[] = {
405 { AV_CH_LAYOUT_MONO, (100<<16) | 1}, // kCAFChannelLayoutTag_Mono
406 { AV_CH_LAYOUT_STEREO, (101<<16) | 2}, // kCAFChannelLayoutTag_Stereo
407 { AV_CH_LAYOUT_STEREO, (102<<16) | 2}, // kCAFChannelLayoutTag_StereoHeadphones
408 { AV_CH_LAYOUT_2_1, (131<<16) | 3}, // kCAFChannelLayoutTag_ITU_2_1
409 { AV_CH_LAYOUT_QUAD, (132<<16) | 4}, // kCAFChannelLayoutTag_ITU_2_2
410 { AV_CH_LAYOUT_2_2, (132<<16) | 4}, // kCAFChannelLayoutTag_ITU_2_2
411 { AV_CH_LAYOUT_QUAD, (108<<16) | 4}, // kCAFChannelLayoutTag_Quadraphonic
412 { AV_CH_LAYOUT_SURROUND, (113<<16) | 3}, // kCAFChannelLayoutTag_MPEG_3_0_A
413 { AV_CH_LAYOUT_4POINT0, (115<<16) | 4}, // kCAFChannelLayoutTag_MPEG_4_0_A
414 { AV_CH_LAYOUT_5POINT0_BACK, (117<<16) | 5}, // kCAFChannelLayoutTag_MPEG_5_0_A
415 { AV_CH_LAYOUT_5POINT0, (117<<16) | 5}, // kCAFChannelLayoutTag_MPEG_5_0_A
416 { AV_CH_LAYOUT_5POINT1_BACK, (121<<16) | 6}, // kCAFChannelLayoutTag_MPEG_5_1_A
417 { AV_CH_LAYOUT_5POINT1, (121<<16) | 6}, // kCAFChannelLayoutTag_MPEG_5_1_A
418 { AV_CH_LAYOUT_7POINT1, (128<<16) | 8}, // kCAFChannelLayoutTag_MPEG_7_1_C
419 { AV_CH_LAYOUT_7POINT1_WIDE, (126<<16) | 8}, // kCAFChannelLayoutTag_MPEG_7_1_A
420 { AV_CH_LAYOUT_5POINT1_BACK|AV_CH_LAYOUT_STEREO_DOWNMIX, (130<<16) | 8}, // kCAFChannelLayoutTag_SMPTE_DTV
421 { AV_CH_LAYOUT_2POINT1, (133<<16) | 3}, // kCAFChannelLayoutTag_DVD_4
422 { AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY, (134<<16) | 4}, // kCAFChannelLayoutTag_DVD_5
423 { AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY, (135<<16) | 4}, // kCAFChannelLayoutTag_DVD_6
424 { AV_CH_LAYOUT_2_2|AV_CH_LOW_FREQUENCY, (135<<16) | 4}, // kCAFChannelLayoutTag_DVD_6
425 { AV_CH_LAYOUT_3POINT1, (136<<16) | 4}, // kCAFChannelLayoutTag_DVD_10
426 { AV_CH_LAYOUT_4POINT1, (137<<16) | 5}, // kCAFChannelLayoutTag_DVD_11
427 { 0, 0},
428 };
429
430 8 void ff_mov_write_chan(AVIOContext *pb, int64_t channel_layout)
431 {
432 const MovChannelLayout *layouts;
433 8 uint32_t layout_tag = 0;
434
435
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 34 for (layouts = mov_channel_layout; layouts->channel_layout; layouts++)
436
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 33 if (channel_layout == layouts->channel_layout) {
437 7 layout_tag = layouts->layout_tag;
438 7 break;
439 }
440
441
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 8 if (layout_tag) {
442 7 avio_wb32(pb, layout_tag); // mChannelLayoutTag
443 7 avio_wb32(pb, 0); // mChannelBitmap
444 } else {
445 1 avio_wb32(pb, 0x10000); // kCAFChannelLayoutTag_UseChannelBitmap
446 1 avio_wb32(pb, channel_layout);
447 }
448 8 avio_wb32(pb, 0); // mNumberChannelDescriptions
449 8 }
450
451 static const struct MP4TrackKindValueMapping dash_role_map[] = {
452 { AV_DISPOSITION_HEARING_IMPAIRED|AV_DISPOSITION_CAPTIONS,
453 "caption" },
454 { AV_DISPOSITION_COMMENT,
455 "commentary" },
456 { AV_DISPOSITION_VISUAL_IMPAIRED|AV_DISPOSITION_DESCRIPTIONS,
457 "description" },
458 { AV_DISPOSITION_DUB,
459 "dub" },
460 { AV_DISPOSITION_FORCED,
461 "forced-subtitle" },
462 { 0, NULL }
463 };
464
465 const struct MP4TrackKindMapping ff_mov_track_kind_table[] = {
466 { "urn:mpeg:dash:role:2011", dash_role_map },
467 { 0, NULL }
468 };
469