FFmpeg
isom.c
Go to the documentation of this file.
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_AAC , 0x40 },
40  { AV_CODEC_ID_MP4ALS , 0x40 }, /* 14496-3 ALS */
41  { AV_CODEC_ID_MPEG2VIDEO , 0x61 }, /* MPEG-2 Main */
42  { AV_CODEC_ID_MPEG2VIDEO , 0x60 }, /* MPEG-2 Simple */
43  { AV_CODEC_ID_MPEG2VIDEO , 0x62 }, /* MPEG-2 SNR */
44  { AV_CODEC_ID_MPEG2VIDEO , 0x63 }, /* MPEG-2 Spatial */
45  { AV_CODEC_ID_MPEG2VIDEO , 0x64 }, /* MPEG-2 High */
46  { AV_CODEC_ID_MPEG2VIDEO , 0x65 }, /* MPEG-2 422 */
47  { AV_CODEC_ID_AAC , 0x66 }, /* MPEG-2 AAC Main */
48  { AV_CODEC_ID_AAC , 0x67 }, /* MPEG-2 AAC Low */
49  { AV_CODEC_ID_AAC , 0x68 }, /* MPEG-2 AAC SSR */
50  { AV_CODEC_ID_MP3 , 0x69 }, /* 13818-3 */
51  { AV_CODEC_ID_MP2 , 0x69 }, /* 11172-3 */
52  { AV_CODEC_ID_MPEG1VIDEO , 0x6A }, /* 11172-2 */
53  { AV_CODEC_ID_MP3 , 0x6B }, /* 11172-3 */
54  { AV_CODEC_ID_MJPEG , 0x6C }, /* 10918-1 */
55  { AV_CODEC_ID_PNG , 0x6D },
56  { AV_CODEC_ID_JPEG2000 , 0x6E }, /* 15444-1 */
57  { AV_CODEC_ID_VC1 , 0xA3 },
58  { AV_CODEC_ID_DIRAC , 0xA4 },
59  { AV_CODEC_ID_AC3 , 0xA5 },
60  { AV_CODEC_ID_EAC3 , 0xA6 },
61  { AV_CODEC_ID_DTS , 0xA9 }, /* mp4ra.org */
62  { AV_CODEC_ID_OPUS , 0xAD }, /* mp4ra.org */
63  { AV_CODEC_ID_VP9 , 0xB1 }, /* mp4ra.org */
64  { AV_CODEC_ID_TSCC2 , 0xD0 }, /* nonstandard, camtasia uses it */
65  { AV_CODEC_ID_EVRC , 0xD1 }, /* nonstandard, pvAuthor uses it */
66  { AV_CODEC_ID_VORBIS , 0xDD }, /* nonstandard, gpac uses it */
67  { AV_CODEC_ID_DVD_SUBTITLE, 0xE0 }, /* nonstandard, see unsupported-embedded-subs-2.mp4 */
68  { AV_CODEC_ID_QCELP , 0xE1 },
69  { AV_CODEC_ID_MPEG4SYSTEMS, 0x01 },
70  { AV_CODEC_ID_MPEG4SYSTEMS, 0x02 },
71  { AV_CODEC_ID_NONE , 0 },
72 };
73 
74 const AVCodecTag ff_codec_movsubtitle_tags[] = {
75  { AV_CODEC_ID_MOV_TEXT, MKTAG('t', 'e', 'x', 't') },
76  { AV_CODEC_ID_MOV_TEXT, MKTAG('t', 'x', '3', 'g') },
77  { AV_CODEC_ID_EIA_608, MKTAG('c', '6', '0', '8') },
78  { AV_CODEC_ID_NONE, 0 },
79 };
80 
81 const AVCodecTag ff_codec_movdata_tags[] = {
82  { AV_CODEC_ID_BIN_DATA, MKTAG('g', 'p', 'm', 'd') },
83  { AV_CODEC_ID_NONE, 0 },
84 };
85 
86 /* map numeric codes from mdhd atom to ISO 639 */
87 /* cf. QTFileFormat.pdf p253, qtff.pdf p205 */
88 /* http://developer.apple.com/documentation/mac/Text/Text-368.html */
89 /* deprecated by putting the code as 3*5 bits ASCII */
90 static const char mov_mdhd_language_map[][4] = {
91  "eng", /* 0 English */
92  "fra", /* 1 French */
93  "ger", /* 2 German */
94  "ita", /* 3 Italian */
95  "dut", /* 4 Dutch */
96  "sve", /* 5 Swedish */
97  "spa", /* 6 Spanish */
98  "dan", /* 7 Danish */
99  "por", /* 8 Portuguese */
100  "nor", /* 9 Norwegian */
101  "heb", /* 10 Hebrew */
102  "jpn", /* 11 Japanese */
103  "ara", /* 12 Arabic */
104  "fin", /* 13 Finnish */
105  "gre", /* 14 Greek */
106  "ice", /* 15 Icelandic */
107  "mlt", /* 16 Maltese */
108  "tur", /* 17 Turkish */
109  "hr ", /* 18 Croatian */
110  "chi", /* 19 Traditional Chinese */
111  "urd", /* 20 Urdu */
112  "hin", /* 21 Hindi */
113  "tha", /* 22 Thai */
114  "kor", /* 23 Korean */
115  "lit", /* 24 Lithuanian */
116  "pol", /* 25 Polish */
117  "hun", /* 26 Hungarian */
118  "est", /* 27 Estonian */
119  "lav", /* 28 Latvian */
120  "smi", /* 29 Sami */
121  "fo ", /* 30 Faroese */
122  "per", /* 31 Farsi */
123  "rus", /* 32 Russian */
124  "chi", /* 33 Simplified Chinese */
125  "", /* 34 Flemish */
126  "iri", /* 35 Irish */
127  "alb", /* 36 Albanian */
128  "ron", /* 37 Romanian */
129  "ces", /* 38 Czech */
130  "slk", /* 39 Slovak */
131  "slv", /* 40 Slovenian */
132  "yid", /* 41 Yiddish */
133  "sr ", /* 42 Serbian */
134  "mac", /* 43 Macedonian */
135  "bul", /* 44 Bulgarian */
136  "ukr", /* 45 Ukrainian */
137  "bel", /* 46 Belarusian */
138  "uzb", /* 47 Uzbek */
139  "kaz", /* 48 Kazakh */
140  "aze", /* 49 Azerbaijani */
141  "aze", /* 50 AzerbaijanAr */
142  "arm", /* 51 Armenian */
143  "geo", /* 52 Georgian */
144  "mol", /* 53 Moldavian */
145  "kir", /* 54 Kirghiz */
146  "tgk", /* 55 Tajiki */
147  "tuk", /* 56 Turkmen */
148  "mon", /* 57 Mongolian */
149  "", /* 58 MongolianCyr */
150  "pus", /* 59 Pashto */
151  "kur", /* 60 Kurdish */
152  "kas", /* 61 Kashmiri */
153  "snd", /* 62 Sindhi */
154  "tib", /* 63 Tibetan */
155  "nep", /* 64 Nepali */
156  "san", /* 65 Sanskrit */
157  "mar", /* 66 Marathi */
158  "ben", /* 67 Bengali */
159  "asm", /* 68 Assamese */
160  "guj", /* 69 Gujarati */
161  "pa ", /* 70 Punjabi */
162  "ori", /* 71 Oriya */
163  "mal", /* 72 Malayalam */
164  "kan", /* 73 Kannada */
165  "tam", /* 74 Tamil */
166  "tel", /* 75 Telugu */
167  "sin", /* 76 Sinhala */
168  "bur", /* 77 Burmese */
169  "khm", /* 78 Khmer */
170  "lao", /* 79 Lao */
171  "vie", /* 80 Vietnamese */
172  "ind", /* 81 Indonesian */
173  "tgl", /* 82 Tagalog */
174  "may", /* 83 MalayRoman */
175  "may", /* 84 MalayArabic */
176  "amh", /* 85 Amharic */
177  "tir", /* 86 Galla */
178  "orm", /* 87 Oromo */
179  "som", /* 88 Somali */
180  "swa", /* 89 Swahili */
181  "kin", /* 90 Kinyarwanda */
182  "run", /* 91 Rundi */
183  "nya", /* 92 Nyanja */
184  "mlg", /* 93 Malagasy */
185  "epo", /* 94 Esperanto */
186  "", /* 95 */
187  "", /* 96 */
188  "", /* 97 */
189  "", /* 98 */
190  "", /* 99 */
191  "", /* 100 */
192  "", /* 101 */
193  "", /* 102 */
194  "", /* 103 */
195  "", /* 104 */
196  "", /* 105 */
197  "", /* 106 */
198  "", /* 107 */
199  "", /* 108 */
200  "", /* 109 */
201  "", /* 110 */
202  "", /* 111 */
203  "", /* 112 */
204  "", /* 113 */
205  "", /* 114 */
206  "", /* 115 */
207  "", /* 116 */
208  "", /* 117 */
209  "", /* 118 */
210  "", /* 119 */
211  "", /* 120 */
212  "", /* 121 */
213  "", /* 122 */
214  "", /* 123 */
215  "", /* 124 */
216  "", /* 125 */
217  "", /* 126 */
218  "", /* 127 */
219  "wel", /* 128 Welsh */
220  "baq", /* 129 Basque */
221  "cat", /* 130 Catalan */
222  "lat", /* 131 Latin */
223  "que", /* 132 Quechua */
224  "grn", /* 133 Guarani */
225  "aym", /* 134 Aymara */
226  "tat", /* 135 Tatar */
227  "uig", /* 136 Uighur */
228  "dzo", /* 137 Dzongkha */
229  "jav", /* 138 JavaneseRom */
230 };
231 
232 int ff_mov_iso639_to_lang(const char lang[4], int mp4)
233 {
234  int i, code = 0;
235 
236  /* old way, only for QT? */
237  for (i = 0; lang[0] && !mp4 && i < FF_ARRAY_ELEMS(mov_mdhd_language_map); i++) {
238  if (!strcmp(lang, mov_mdhd_language_map[i]))
239  return i;
240  }
241  /* XXX:can we do that in mov too? */
242  if (!mp4)
243  return -1;
244  /* handle undefined as such */
245  if (lang[0] == '\0')
246  lang = "und";
247  /* 5 bits ASCII */
248  for (i = 0; i < 3; i++) {
249  uint8_t c = lang[i];
250  c -= 0x60;
251  if (c > 0x1f)
252  return -1;
253  code <<= 5;
254  code |= c;
255  }
256  return code;
257 }
258 
259 int ff_mov_lang_to_iso639(unsigned code, char to[4])
260 {
261  int i;
262  memset(to, 0, 4);
263  /* is it the mangled iso code? */
264  /* see http://www.geocities.com/xhelmboyx/quicktime/formats/mp4-layout.txt */
265  if (code >= 0x400 && code != 0x7fff) {
266  for (i = 2; i >= 0; i--) {
267  to[i] = 0x60 + (code & 0x1f);
268  code >>= 5;
269  }
270  return 1;
271  }
272  /* old fashion apple lang code */
273  if (code >= FF_ARRAY_ELEMS(mov_mdhd_language_map))
274  return 0;
275  if (!mov_mdhd_language_map[code][0])
276  return 0;
277  memcpy(to, mov_mdhd_language_map[code], 4);
278  return 1;
279 }
280 
281 int ff_mp4_read_descr_len(AVIOContext *pb)
282 {
283  int len = 0;
284  int count = 4;
285  while (count--) {
286  int c = avio_r8(pb);
287  len = (len << 7) | (c & 0x7f);
288  if (!(c & 0x80))
289  break;
290  }
291  return len;
292 }
293 
294 int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag)
295 {
296  int len;
297  *tag = avio_r8(pb);
298  len = ff_mp4_read_descr_len(pb);
299  av_log(fc, AV_LOG_TRACE, "MPEG-4 description: tag=0x%02x len=%d\n", *tag, len);
300  return len;
301 }
302 
303 void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id)
304 {
305  int flags;
306  if (es_id) *es_id = avio_rb16(pb);
307  else avio_rb16(pb);
308  flags = avio_r8(pb);
309  if (flags & 0x80) //streamDependenceFlag
310  avio_rb16(pb);
311  if (flags & 0x40) { //URL_Flag
312  int len = avio_r8(pb);
313  avio_skip(pb, len);
314  }
315  if (flags & 0x20) //OCRstreamFlag
316  avio_rb16(pb);
317 }
318 
319 static const AVCodecTag mp4_audio_types[] = {
320  { AV_CODEC_ID_MP3ON4, AOT_PS }, /* old mp3on4 draft */
321  { AV_CODEC_ID_MP3ON4, AOT_L1 }, /* layer 1 */
322  { AV_CODEC_ID_MP3ON4, AOT_L2 }, /* layer 2 */
323  { AV_CODEC_ID_MP3ON4, AOT_L3 }, /* layer 3 */
324  { AV_CODEC_ID_MP4ALS, AOT_ALS }, /* MPEG-4 ALS */
325  { AV_CODEC_ID_NONE, AOT_NULL },
326 };
327 
328 int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext *pb)
329 {
330  enum AVCodecID codec_id;
331  int len, tag;
332  int ret;
333  int object_type_id = avio_r8(pb);
334  avio_r8(pb); /* stream type */
335  avio_rb24(pb); /* buffer size db */
336  avio_rb32(pb); /* rc_max_rate */
337 
338  st->codecpar->bit_rate = avio_rb32(pb); /* avg bitrate */
339 
340  codec_id= ff_codec_get_id(ff_mp4_obj_type, object_type_id);
341  if (codec_id)
342  st->codecpar->codec_id = codec_id;
343  av_log(fc, AV_LOG_TRACE, "esds object type id 0x%02x\n", object_type_id);
344  len = ff_mp4_read_descr(fc, pb, &tag);
345  if (tag == MP4DecSpecificDescrTag) {
346  av_log(fc, AV_LOG_TRACE, "Specific MPEG-4 header len=%d\n", len);
347  /* As per 14496-3:2009 9.D.2.2, No decSpecificInfo is defined
348  for MPEG-1 Audio or MPEG-2 Audio; MPEG-2 AAC excluded. */
349  if (object_type_id == 0x69 || object_type_id == 0x6b)
350  return 0;
351  if (!len || (uint64_t)len > (1<<30))
352  return AVERROR_INVALIDDATA;
353  if ((ret = ff_get_extradata(fc, st->codecpar, pb, len)) < 0)
354  return ret;
355  if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
356  MPEG4AudioConfig cfg = {0};
357  ret = avpriv_mpeg4audio_get_config2(&cfg, st->codecpar->extradata,
358  st->codecpar->extradata_size, 1, fc);
359  if (ret < 0)
360  return ret;
361  av_channel_layout_uninit(&st->codecpar->ch_layout);
362  st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
363  st->codecpar->ch_layout.nb_channels = cfg.channels;
364  if (cfg.object_type == 29 && cfg.sampling_index < 3) // old mp3on4
365  st->codecpar->sample_rate = ff_mpa_freq_tab[cfg.sampling_index];
366  else if (cfg.ext_sample_rate)
367  st->codecpar->sample_rate = cfg.ext_sample_rate;
368  else
369  st->codecpar->sample_rate = cfg.sample_rate;
370  av_log(fc, AV_LOG_TRACE, "mp4a config channels %d obj %d ext obj %d "
371  "sample rate %d ext sample rate %d\n", cfg.channels,
372  cfg.object_type, cfg.ext_object_type,
373  cfg.sample_rate, cfg.ext_sample_rate);
374  if (!(st->codecpar->codec_id = ff_codec_get_id(mp4_audio_types,
375  cfg.object_type)))
376  st->codecpar->codec_id = AV_CODEC_ID_AAC;
377  }
378  }
379  return 0;
380 }
381 
382 typedef struct MovChannelLayout {
383  int64_t channel_layout;
384  uint32_t layout_tag;
385 } MovChannelLayout;
386 
387 static const MovChannelLayout mov_channel_layout[] = {
388  { AV_CH_LAYOUT_MONO, (100<<16) | 1}, // kCAFChannelLayoutTag_Mono
389  { AV_CH_LAYOUT_STEREO, (101<<16) | 2}, // kCAFChannelLayoutTag_Stereo
390  { AV_CH_LAYOUT_STEREO, (102<<16) | 2}, // kCAFChannelLayoutTag_StereoHeadphones
391  { AV_CH_LAYOUT_2_1, (131<<16) | 3}, // kCAFChannelLayoutTag_ITU_2_1
392  { AV_CH_LAYOUT_QUAD, (132<<16) | 4}, // kCAFChannelLayoutTag_ITU_2_2
393  { AV_CH_LAYOUT_2_2, (132<<16) | 4}, // kCAFChannelLayoutTag_ITU_2_2
394  { AV_CH_LAYOUT_QUAD, (108<<16) | 4}, // kCAFChannelLayoutTag_Quadraphonic
395  { AV_CH_LAYOUT_SURROUND, (113<<16) | 3}, // kCAFChannelLayoutTag_MPEG_3_0_A
396  { AV_CH_LAYOUT_4POINT0, (115<<16) | 4}, // kCAFChannelLayoutTag_MPEG_4_0_A
397  { AV_CH_LAYOUT_5POINT0_BACK, (117<<16) | 5}, // kCAFChannelLayoutTag_MPEG_5_0_A
398  { AV_CH_LAYOUT_5POINT0, (117<<16) | 5}, // kCAFChannelLayoutTag_MPEG_5_0_A
399  { AV_CH_LAYOUT_5POINT1_BACK, (121<<16) | 6}, // kCAFChannelLayoutTag_MPEG_5_1_A
400  { AV_CH_LAYOUT_5POINT1, (121<<16) | 6}, // kCAFChannelLayoutTag_MPEG_5_1_A
401  { AV_CH_LAYOUT_7POINT1, (128<<16) | 8}, // kCAFChannelLayoutTag_MPEG_7_1_C
402  { AV_CH_LAYOUT_7POINT1_WIDE, (126<<16) | 8}, // kCAFChannelLayoutTag_MPEG_7_1_A
403  { AV_CH_LAYOUT_5POINT1_BACK|AV_CH_LAYOUT_STEREO_DOWNMIX, (130<<16) | 8}, // kCAFChannelLayoutTag_SMPTE_DTV
404  { AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY, (133<<16) | 3}, // kCAFChannelLayoutTag_DVD_4
405  { AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY, (134<<16) | 4}, // kCAFChannelLayoutTag_DVD_5
406  { AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY, (135<<16) | 4}, // kCAFChannelLayoutTag_DVD_6
407  { AV_CH_LAYOUT_2_2|AV_CH_LOW_FREQUENCY, (135<<16) | 4}, // kCAFChannelLayoutTag_DVD_6
408  { AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, (136<<16) | 4}, // kCAFChannelLayoutTag_DVD_10
409  { AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY, (137<<16) | 5}, // kCAFChannelLayoutTag_DVD_11
410  { 0, 0},
411 };
412 
413 void ff_mov_write_chan(AVIOContext *pb, int64_t channel_layout)
414 {
415  const MovChannelLayout *layouts;
416  uint32_t layout_tag = 0;
417 
418  for (layouts = mov_channel_layout; layouts->channel_layout; layouts++)
419  if (channel_layout == layouts->channel_layout) {
420  layout_tag = layouts->layout_tag;
421  break;
422  }
423 
424  if (layout_tag) {
425  avio_wb32(pb, layout_tag); // mChannelLayoutTag
426  avio_wb32(pb, 0); // mChannelBitmap
427  } else {
428  avio_wb32(pb, 0x10000); // kCAFChannelLayoutTag_UseChannelBitmap
429  avio_wb32(pb, channel_layout);
430  }
431  avio_wb32(pb, 0); // mNumberChannelDescriptions
432 }
433 
434 static const struct MP4TrackKindValueMapping dash_role_map[] = {
435  { AV_DISPOSITION_HEARING_IMPAIRED|AV_DISPOSITION_CAPTIONS,
436  "caption" },
437  { AV_DISPOSITION_COMMENT,
438  "commentary" },
439  { AV_DISPOSITION_VISUAL_IMPAIRED|AV_DISPOSITION_DESCRIPTIONS,
440  "description" },
441  { AV_DISPOSITION_DUB,
442  "dub" },
443  { AV_DISPOSITION_FORCED,
444  "forced-subtitle" },
445  { 0, NULL }
446 };
447 
448 const struct MP4TrackKindMapping ff_mov_track_kind_table[] = {
449  { "urn:mpeg:dash:role:2011", dash_role_map },
450  { 0, NULL }
451 };
AV_CODEC_ID_EIA_608
@ AV_CODEC_ID_EIA_608
Definition: codec_id.h:560
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:69
AV_CH_LAYOUT_5POINT0_BACK
#define AV_CH_LAYOUT_5POINT0_BACK
Definition: channel_layout.h:222
AV_CODEC_ID_AC3
@ AV_CODEC_ID_AC3
Definition: codec_id.h:445
ff_mp4_obj_type
const AVCodecTag ff_mp4_obj_type[]
Definition: isom.c:34
layouts
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:326
MovChannelLayout::layout_tag
uint32_t layout_tag
Definition: isom.c:384
AOT_PS
@ AOT_PS
N Parametric Stereo.
Definition: mpeg4audio.h:98
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:210
AV_CODEC_ID_DIRAC
@ AV_CODEC_ID_DIRAC
Definition: codec_id.h:168
AV_CODEC_ID_MP3ON4
@ AV_CODEC_ID_MP3ON4
Definition: codec_id.h:456
AOT_L1
@ AOT_L1
Y Layer 1.
Definition: mpeg4audio.h:101
AV_CODEC_ID_MPEG4
@ AV_CODEC_ID_MPEG4
Definition: codec_id.h:64
ff_mp4_read_dec_config_descr
int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext *pb)
Definition: isom.c:328
fc
#define fc(width, name, range_min, range_max)
Definition: cbs_av1.c:464
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:312
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:317
AV_CODEC_ID_BIN_DATA
@ AV_CODEC_ID_BIN_DATA
Definition: codec_id.h:590
ff_mov_lang_to_iso639
int ff_mov_lang_to_iso639(unsigned code, char to[4])
Definition: isom.c:259
ff_get_extradata
int ff_get_extradata(void *logctx, AVCodecParameters *par, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: demux_utils.c:355
MPEG4AudioConfig
Definition: mpeg4audio.h:29
mpeg4audio.h
MP4DecSpecificDescrTag
#define MP4DecSpecificDescrTag
Definition: isom.h:342
AV_DISPOSITION_FORCED
#define AV_DISPOSITION_FORCED
Track should be used during playback by default.
Definition: avformat.h:752
AV_CODEC_ID_MP3
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:443
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:211
AV_CH_LAYOUT_QUAD
#define AV_CH_LAYOUT_QUAD
Definition: channel_layout.h:219
MovChannelLayout::channel_layout
int64_t channel_layout
Definition: isom.c:383
ff_mp4_parse_es_descr
void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id)
Definition: isom.c:303
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:808
AV_LOG_TRACE
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:206
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
AVCodecTag
Definition: internal.h:48
AV_CH_LOW_FREQUENCY
#define AV_CH_LOW_FREQUENCY
Definition: channel_layout.h:167
AV_CODEC_ID_MPEG4SYSTEMS
@ AV_CODEC_ID_MPEG4SYSTEMS
FAKE codec to indicate a MPEG-4 Systems stream (only used by libavformat)
Definition: codec_id.h:598
avpriv_mpeg4audio_get_config2
int avpriv_mpeg4audio_get_config2(MPEG4AudioConfig *c, const uint8_t *buf, int size, int sync_extension, void *logctx)
Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration.
Definition: mpeg4audio.c:165
AV_CODEC_ID_VP9
@ AV_CODEC_ID_VP9
Definition: codec_id.h:220
AV_CHANNEL_ORDER_UNSPEC
@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
Definition: channel_layout.h:112
AV_CODEC_ID_MP2
@ AV_CODEC_ID_MP2
Definition: codec_id.h:442
AV_CH_LAYOUT_STEREO_DOWNMIX
#define AV_CH_LAYOUT_STEREO_DOWNMIX
Definition: channel_layout.h:243
to
const char * to
Definition: webvttdec.c:35
mov_channel_layout
static const MovChannelLayout mov_channel_layout[]
Definition: isom.c:387
codec_id
enum AVCodecID codec_id
Definition: vaapi_decode.c:389
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:79
AV_CH_LAYOUT_2_1
#define AV_CH_LAYOUT_2_1
Definition: channel_layout.h:213
AV_CODEC_ID_PNG
@ AV_CODEC_ID_PNG
Definition: codec_id.h:113
AVFormatContext
Format I/O context.
Definition: avformat.h:1115
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:864
MovChannelLayout
Definition: isom.c:382
NULL
#define NULL
Definition: coverity.c:32
isom.h
AV_CODEC_ID_MOV_TEXT
@ AV_CODEC_ID_MOV_TEXT
Definition: codec_id.h:555
AV_DISPOSITION_COMMENT
#define AV_DISPOSITION_COMMENT
The stream is a commentary track.
Definition: avformat.h:737
AV_CODEC_ID_DVD_SUBTITLE
@ AV_CODEC_ID_DVD_SUBTITLE
Definition: codec_id.h:550
MPEG4AudioConfig::sampling_index
int sampling_index
Definition: mpeg4audio.h:31
AV_CH_LAYOUT_5POINT1
#define AV_CH_LAYOUT_5POINT1
Definition: channel_layout.h:221
mov_mdhd_language_map
static const char mov_mdhd_language_map[][4]
Definition: isom.c:90
ff_mp4_read_descr
int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag)
Definition: isom.c:294
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:206
AV_CODEC_ID_MP4ALS
@ AV_CODEC_ID_MP4ALS
Definition: codec_id.h:487
ff_codec_movdata_tags
const AVCodecTag ff_codec_movdata_tags[]
Definition: isom.c:81
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:171
AV_CODEC_ID_MPEG1VIDEO
@ AV_CODEC_ID_MPEG1VIDEO
Definition: codec_id.h:53
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:49
AV_CODEC_ID_EAC3
@ AV_CODEC_ID_EAC3
Definition: codec_id.h:482
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:73
AV_CODEC_ID_AAC
@ AV_CODEC_ID_AAC
Definition: codec_id.h:444
AV_CODEC_ID_QCELP
@ AV_CODEC_ID_QCELP
Definition: codec_id.h:466
AV_DISPOSITION_CAPTIONS
#define AV_DISPOSITION_CAPTIONS
The subtitle stream contains captions, providing a transcription and possibly a translation of audio.
Definition: avformat.h:790
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
avio_rb24
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:801
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:145
AOT_L2
@ AOT_L2
Y Layer 2.
Definition: mpeg4audio.h:102
AV_CODEC_ID_DTS
@ AV_CODEC_ID_DTS
Definition: codec_id.h:446
dash_role_map
static const struct MP4TrackKindValueMapping dash_role_map[]
Definition: isom.c:434
AV_CODEC_ID_OPUS
@ AV_CODEC_ID_OPUS
Definition: codec_id.h:502
AV_DISPOSITION_DUB
#define AV_DISPOSITION_DUB
The stream is not in original language.
Definition: avformat.h:727
ff_mov_iso639_to_lang
int ff_mov_iso639_to_lang(const char lang[4], int mp4)
Definition: isom.c:232
AV_DISPOSITION_HEARING_IMPAIRED
#define AV_DISPOSITION_HEARING_IMPAIRED
The stream is intended for hearing impaired audiences.
Definition: avformat.h:756
avio_wb32
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:412
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:650
AV_CH_LAYOUT_5POINT1_BACK
#define AV_CH_LAYOUT_5POINT1_BACK
Definition: channel_layout.h:223
MPEG4AudioConfig::ext_object_type
int ext_object_type
Definition: mpeg4audio.h:35
ff_mp4_read_descr_len
int ff_mp4_read_descr_len(AVIOContext *pb)
Definition: isom.c:281
MPEG4AudioConfig::channels
int channels
Definition: mpeg4audio.h:39
AV_CODEC_ID_TSCC2
@ AV_CODEC_ID_TSCC2
Definition: codec_id.h:216
AV_CH_LAYOUT_5POINT0
#define AV_CH_LAYOUT_5POINT0
Definition: channel_layout.h:220
AV_CODEC_ID_MJPEG
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:59
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:50
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
AV_CODEC_ID_EVRC
@ AV_CODEC_ID_EVRC
Definition: codec_id.h:513
AV_CH_LAYOUT_7POINT1
#define AV_CH_LAYOUT_7POINT1
Definition: channel_layout.h:233
AV_CODEC_ID_HEVC
@ AV_CODEC_ID_HEVC
Definition: codec_id.h:226
AV_CH_LAYOUT_7POINT1_WIDE
#define AV_CH_LAYOUT_7POINT1_WIDE
Definition: channel_layout.h:234
AV_CODEC_ID_VC1
@ AV_CODEC_ID_VC1
Definition: codec_id.h:122
demux.h
len
int len
Definition: vorbis_enc_data.h:426
AV_CODEC_ID_JPEG2000
@ AV_CODEC_ID_JPEG2000
Definition: codec_id.h:140
AOT_NULL
@ AOT_NULL
Definition: mpeg4audio.h:71
MPEG4AudioConfig::ext_sample_rate
int ext_sample_rate
Definition: mpeg4audio.h:37
MP4TrackKindValueMapping
Definition: isom.h:425
mp4_audio_types
static const AVCodecTag mp4_audio_types[]
Definition: isom.c:319
AV_DISPOSITION_VISUAL_IMPAIRED
#define AV_DISPOSITION_VISUAL_IMPAIRED
The stream is intended for visually impaired audiences.
Definition: avformat.h:760
tag
uint32_t tag
Definition: movenc.c:1737
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:841
AV_CH_LAYOUT_SURROUND
#define AV_CH_LAYOUT_SURROUND
Definition: channel_layout.h:214
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:793
avformat.h
AV_DISPOSITION_DESCRIPTIONS
#define AV_DISPOSITION_DESCRIPTIONS
The subtitle stream contains a textual description of the video content.
Definition: avformat.h:796
MPEG4AudioConfig::object_type
int object_type
Definition: mpeg4audio.h:30
channel_layout.h
av_channel_layout_uninit
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
Free any allocated data in the channel layout and reset the channel count to 0.
Definition: channel_layout.c:640
ff_mpa_freq_tab
const uint16_t ff_mpa_freq_tab[3]
Definition: mpegaudiotabs.h:37
ff_codec_movsubtitle_tags
const AVCodecTag ff_codec_movsubtitle_tags[]
Definition: isom.c:74
mpegaudiodata.h
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:365
AOT_ALS
@ AOT_ALS
Y Audio LosslesS.
Definition: mpeg4audio.h:105
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AV_CH_LAYOUT_4POINT0
#define AV_CH_LAYOUT_4POINT0
Definition: channel_layout.h:216
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:84
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
ff_mov_track_kind_table
const struct MP4TrackKindMapping ff_mov_track_kind_table[]
Definition: isom.c:448
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
AV_CODEC_ID_VORBIS
@ AV_CODEC_ID_VORBIS
Definition: codec_id.h:447
ff_mov_write_chan
void ff_mov_write_chan(AVIOContext *pb, int64_t channel_layout)
Definition: isom.c:413
AOT_L3
@ AOT_L3
Y Layer 3.
Definition: mpeg4audio.h:103
AV_CODEC_ID_MPEG2VIDEO
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:54
AV_CH_LAYOUT_2_2
#define AV_CH_LAYOUT_2_2
Definition: channel_layout.h:218
MP4TrackKindMapping
Definition: isom.h:430
MPEG4AudioConfig::sample_rate
int sample_rate
Definition: mpeg4audio.h:32
Generated on Thu Apr 18 2024 22:42:35 for FFmpeg by   doxygen 1.8.17