FFmpeg  4.4.4
mp3enc.c
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1 /*
2  * MP3 muxer
3  * Copyright (c) 2003 Fabrice Bellard
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 "avformat.h"
23 #include "avio_internal.h"
24 #include "id3v1.h"
25 #include "id3v2.h"
26 #include "rawenc.h"
27 #include "libavutil/avstring.h"
28 #include "libavcodec/mpegaudio.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/dict.h"
35 #include "libavutil/avassert.h"
36 #include "libavutil/crc.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/replaygain.h"
39 
40 static int id3v1_set_string(AVFormatContext *s, const char *key,
41  uint8_t *buf, int buf_size)
42 {
44  if ((tag = av_dict_get(s->metadata, key, NULL, 0)))
45  av_strlcpy(buf, tag->value, buf_size);
46  return !!tag;
47 }
48 
49 // refer to: http://id3.org/ID3v1
51 {
53  int i, count = 0;
54 
55  memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
56  buf[0] = 'T';
57  buf[1] = 'A';
58  buf[2] = 'G';
59  /* we knowingly overspecify each tag length by one byte to compensate for the mandatory null byte added by av_strlcpy */
60  count += id3v1_set_string(s, "TIT2", buf + 3, 30 + 1); //title
61  count += id3v1_set_string(s, "TPE1", buf + 33, 30 + 1); //author|artist
62  count += id3v1_set_string(s, "TALB", buf + 63, 30 + 1); //album
63  if ((tag = av_dict_get(s->metadata, "TYER", NULL, 0))) { //year
64  av_strlcpy(buf + 93, tag->value, 4 + 1);
65  count++;
66  } else if ((tag = av_dict_get(s->metadata, "TDRC", NULL, 0))) {
67  av_strlcpy(buf + 93, tag->value, 4 + 1);
68  count++;
69  } else if ((tag = av_dict_get(s->metadata, "TDAT", NULL, 0))) {
70  av_strlcpy(buf + 93, tag->value, 4 + 1);
71  count++;
72  }
73 
74  count += id3v1_set_string(s, "comment", buf + 97, 30 + 1);
75  if ((tag = av_dict_get(s->metadata, "TRCK", NULL, 0))) { //track
76  buf[125] = 0;
77  buf[126] = atoi(tag->value);
78  count++;
79  }
80  buf[127] = 0xFF; /* default to unknown genre */
81  if ((tag = av_dict_get(s->metadata, "TCON", NULL, 0))) { //genre
82  for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
83  if (!av_strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
84  buf[127] = i;
85  count++;
86  break;
87  }
88  }
89  }
90  return count;
91 }
92 
93 #define XING_NUM_BAGS 400
94 #define XING_TOC_SIZE 100
95 // size of the XING/LAME data, starting from the Xing tag
96 #define XING_SIZE 156
97 
98 typedef struct MP3Context {
99  const AVClass *class;
104 
105  /* xing header */
106  // a buffer containing the whole XING/LAME frame
109 
110  AVCRC audio_crc; // CRC of the audio data
111  uint32_t audio_size; // total size of the audio data
112 
113  // offset of the XING/LAME frame in the file
115  // offset of the XING/INFO tag in the frame
117 
120  uint32_t want;
121  uint32_t seen;
122  uint32_t pos;
123  uint64_t bag[XING_NUM_BAGS];
126  int delay;
127  int padding;
128 
129  /* index of the audio stream */
131  /* number of attached pictures we still need to write */
133 
134  /* audio packets are queued here until we get all the attached pictures */
136 } MP3Context;
137 
138 static const uint8_t xing_offtbl[2][2] = {{32, 17}, {17, 9}};
139 
140 /*
141  * Write an empty XING header and initialize respective data.
142  */
144 {
145  MP3Context *mp3 = s->priv_data;
146  AVCodecParameters *par = s->streams[mp3->audio_stream_idx]->codecpar;
147  AVDictionaryEntry *enc = av_dict_get(s->streams[mp3->audio_stream_idx]->metadata, "encoder", NULL, 0);
148  AVIOContext *dyn_ctx;
149  int32_t header;
150  MPADecodeHeader mpah;
151  int srate_idx, i, channels;
152  int bitrate_idx;
153  int best_bitrate_idx = -1;
154  int best_bitrate_error = INT_MAX;
155  int ret;
156  int ver = 0;
157  int bytes_needed;
158 
159  if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL) || !mp3->write_xing)
160  return 0;
161 
162  for (i = 0; i < FF_ARRAY_ELEMS(avpriv_mpa_freq_tab); i++) {
163  const uint16_t base_freq = avpriv_mpa_freq_tab[i];
164 
165  if (par->sample_rate == base_freq) ver = 0x3; // MPEG 1
166  else if (par->sample_rate == base_freq / 2) ver = 0x2; // MPEG 2
167  else if (par->sample_rate == base_freq / 4) ver = 0x0; // MPEG 2.5
168  else continue;
169 
170  srate_idx = i;
171  break;
172  }
174  av_log(s, AV_LOG_WARNING, "Unsupported sample rate, not writing Xing header.\n");
175  return -1;
176  }
177 
178  switch (par->channels) {
179  case 1: channels = MPA_MONO; break;
180  case 2: channels = MPA_STEREO; break;
181  default: av_log(s, AV_LOG_WARNING, "Unsupported number of channels, "
182  "not writing Xing header.\n");
183  return -1;
184  }
185 
186  /* dummy MPEG audio header */
187  header = 0xffU << 24; // sync
188  header |= (0x7 << 5 | ver << 3 | 0x1 << 1 | 0x1) << 16; // sync/audio-version/layer 3/no crc*/
189  header |= (srate_idx << 2) << 8;
190  header |= channels << 6;
191 
192  for (bitrate_idx = 1; bitrate_idx < 15; bitrate_idx++) {
193  int bit_rate = 1000 * avpriv_mpa_bitrate_tab[ver != 3][3 - 1][bitrate_idx];
194  int error = FFABS(bit_rate - par->bit_rate);
195 
196  if (error < best_bitrate_error) {
197  best_bitrate_error = error;
198  best_bitrate_idx = bitrate_idx;
199  }
200  }
201  av_assert0(best_bitrate_idx >= 0);
202 
203  for (bitrate_idx = best_bitrate_idx; ; bitrate_idx++) {
204  int32_t mask = bitrate_idx << (4 + 8);
205  if (15 == bitrate_idx)
206  return -1;
207  header |= mask;
208 
210  av_assert0(ret >= 0);
211  mp3->xing_offset = xing_offtbl[mpah.lsf == 1][mpah.nb_channels == 1] + 4;
212  bytes_needed = mp3->xing_offset + XING_SIZE;
213 
214  if (bytes_needed <= mpah.frame_size)
215  break;
216 
217  header &= ~mask;
218  }
219 
220  ret = avio_open_dyn_buf(&dyn_ctx);
221  if (ret < 0)
222  return ret;
223 
224  avio_wb32(dyn_ctx, header);
225 
226  ffio_fill(dyn_ctx, 0, mp3->xing_offset - 4);
227  ffio_wfourcc(dyn_ctx, "Xing");
228  avio_wb32(dyn_ctx, 0x01 | 0x02 | 0x04 | 0x08); // frames / size / TOC / vbr scale
229 
230  mp3->size = mpah.frame_size;
231  mp3->want=1;
232  mp3->seen=0;
233  mp3->pos=0;
234 
235  avio_wb32(dyn_ctx, 0); // frames
236  avio_wb32(dyn_ctx, 0); // size
237 
238  // TOC
239  for (i = 0; i < XING_TOC_SIZE; i++)
240  avio_w8(dyn_ctx, (uint8_t)(255 * i / XING_TOC_SIZE));
241 
242  // vbr quality
243  // we write it, because some (broken) tools always expect it to be present
244  avio_wb32(dyn_ctx, 0);
245 
246  // encoder short version string
247  if (enc) {
248  uint8_t encoder_str[9] = { 0 };
249  if ( strlen(enc->value) > sizeof(encoder_str)
250  && !strcmp("Lavc libmp3lame", enc->value)) {
251  memcpy(encoder_str, "Lavf lame", 9);
252  } else
253  memcpy(encoder_str, enc->value, FFMIN(strlen(enc->value), sizeof(encoder_str)));
254 
255  avio_write(dyn_ctx, encoder_str, sizeof(encoder_str));
256  } else
257  avio_write(dyn_ctx, "Lavf\0\0\0\0\0", 9);
258 
259  avio_w8(dyn_ctx, 0); // tag revision 0 / unknown vbr method
260  avio_w8(dyn_ctx, 0); // unknown lowpass filter value
261  ffio_fill(dyn_ctx, 0, 8); // empty replaygain fields
262  avio_w8(dyn_ctx, 0); // unknown encoding flags
263  avio_w8(dyn_ctx, 0); // unknown abr/minimal bitrate
264  avio_wb24(dyn_ctx, 0); // empty encoder delay/padding
265 
266  avio_w8(dyn_ctx, 0); // misc
267  avio_w8(dyn_ctx, 0); // mp3gain
268  avio_wb16(dyn_ctx, 0); // preset
269 
270  // audio length and CRCs (will be updated later)
271  avio_wb32(dyn_ctx, 0); // music length
272  avio_wb16(dyn_ctx, 0); // music crc
273  avio_wb16(dyn_ctx, 0); // tag crc
274 
275  ffio_fill(dyn_ctx, 0, mpah.frame_size - bytes_needed);
276 
277  mp3->xing_frame_size = avio_close_dyn_buf(dyn_ctx, &mp3->xing_frame);
278  mp3->xing_frame_offset = avio_tell(s->pb);
279  avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size);
280 
281  mp3->audio_size = mp3->xing_frame_size;
282 
283  return 0;
284 }
285 
286 /*
287  * Add a frame to XING data.
288  * Following lame's "VbrTag.c".
289  */
291 {
292  int i;
293 
294  mp3->frames++;
295  mp3->seen++;
296  mp3->size += pkt->size;
297 
298  if (mp3->want == mp3->seen) {
299  mp3->bag[mp3->pos] = mp3->size;
300 
301  if (XING_NUM_BAGS == ++mp3->pos) {
302  /* shrink table to half size by throwing away each second bag. */
303  for (i = 1; i < XING_NUM_BAGS; i += 2)
304  mp3->bag[i >> 1] = mp3->bag[i];
305 
306  /* double wanted amount per bag. */
307  mp3->want *= 2;
308  /* adjust current position to half of table size. */
309  mp3->pos = XING_NUM_BAGS / 2;
310  }
311 
312  mp3->seen = 0;
313  }
314 }
315 
317 {
318  MP3Context *mp3 = s->priv_data;
319 
320  if (pkt->data && pkt->size >= 4) {
321  MPADecodeHeader mpah;
322  int ret;
323  int av_unused base;
324  uint32_t h;
325 
326  h = AV_RB32(pkt->data);
327  ret = avpriv_mpegaudio_decode_header(&mpah, h);
328  if (ret >= 0) {
329  if (!mp3->initial_bitrate)
330  mp3->initial_bitrate = mpah.bit_rate;
331  if ((mpah.bit_rate == 0) || (mp3->initial_bitrate != mpah.bit_rate))
332  mp3->has_variable_bitrate = 1;
333  } else {
334  av_log(s, AV_LOG_WARNING, "Audio packet of size %d (starting with %08"PRIX32"...) "
335  "is invalid, writing it anyway.\n", pkt->size, h);
336  }
337 
338 #ifdef FILTER_VBR_HEADERS
339  /* filter out XING and INFO headers. */
340  base = 4 + xing_offtbl[mpah.lsf == 1][mpah.nb_channels == 1];
341 
342  if (base + 4 <= pkt->size) {
343  uint32_t v = AV_RB32(pkt->data + base);
344 
345  if (MKBETAG('X','i','n','g') == v || MKBETAG('I','n','f','o') == v)
346  return 0;
347  }
348 
349  /* filter out VBRI headers. */
350  base = 4 + 32;
351 
352  if (base + 4 <= pkt->size && MKBETAG('V','B','R','I') == AV_RB32(pkt->data + base))
353  return 0;
354 #endif
355 
356  if (mp3->xing_offset) {
357  uint8_t *side_data = NULL;
358  buffer_size_t side_data_size;
359 
360  mp3_xing_add_frame(mp3, pkt);
361  mp3->audio_size += pkt->size;
363  mp3->audio_crc, pkt->data, pkt->size);
364 
365  side_data = av_packet_get_side_data(pkt,
367  &side_data_size);
368  if (side_data && side_data_size >= 10) {
369  mp3->padding = FFMAX(AV_RL32(side_data + 4) + 528 + 1, 0);
370  if (!mp3->delay)
371  mp3->delay = FFMAX(AV_RL32(side_data) - 528 - 1, 0);
372  } else {
373  mp3->padding = 0;
374  }
375  }
376  }
377 
378  return ff_raw_write_packet(s, pkt);
379 }
380 
382 {
383  MP3Context *mp3 = s->priv_data;
384  AVPacket pkt;
385  int ret = 0, write = 1;
386 
387  ff_id3v2_finish(&mp3->id3, s->pb, s->metadata_header_padding);
388  mp3_write_xing(s);
389 
390  while (mp3->queue) {
391  avpriv_packet_list_get(&mp3->queue, &mp3->queue_end, &pkt);
392  if (write && (ret = mp3_write_audio_packet(s, &pkt)) < 0)
393  write = 0;
395  }
396  return ret;
397 }
398 
400 {
401  MP3Context *mp3 = s->priv_data;
402  AVReplayGain *rg;
403  uint16_t tag_crc;
404  uint8_t *toc;
405  buffer_size_t rg_size;
406  int i;
407  int64_t old_pos = avio_tell(s->pb);
408 
409  /* replace "Xing" identification string with "Info" for CBR files. */
410  if (!mp3->has_variable_bitrate)
411  AV_WL32(mp3->xing_frame + mp3->xing_offset, MKTAG('I', 'n', 'f', 'o'));
412 
413  AV_WB32(mp3->xing_frame + mp3->xing_offset + 8, mp3->frames);
414  AV_WB32(mp3->xing_frame + mp3->xing_offset + 12, mp3->size);
415 
416  toc = mp3->xing_frame + mp3->xing_offset + 16;
417  toc[0] = 0; // first toc entry has to be zero.
418  for (i = 1; i < XING_TOC_SIZE; ++i) {
419  int j = i * mp3->pos / XING_TOC_SIZE;
420  int seek_point = 256LL * mp3->bag[j] / mp3->size;
421  toc[i] = FFMIN(seek_point, 255);
422  }
423 
424  /* write replaygain */
426  &rg_size);
427  if (rg && rg_size >= sizeof(*rg)) {
428  uint16_t val;
429 
430  AV_WB32(mp3->xing_frame + mp3->xing_offset + 131,
431  av_rescale(rg->track_peak, 1 << 23, 100000));
432 
433  if (rg->track_gain != INT32_MIN) {
434  val = FFABS(rg->track_gain / 10000) & ((1 << 9) - 1);
435  val |= (rg->track_gain < 0) << 9;
436  val |= 1 << 13;
437  AV_WB16(mp3->xing_frame + mp3->xing_offset + 135, val);
438  }
439 
440  if (rg->album_gain != INT32_MIN) {
441  val = FFABS(rg->album_gain / 10000) & ((1 << 9) - 1);
442  val |= (rg->album_gain < 0) << 9;
443  val |= 1 << 14;
444  AV_WB16(mp3->xing_frame + mp3->xing_offset + 137, val);
445  }
446  }
447 
448  /* write encoder delay/padding */
449  if (mp3->delay >= 1 << 12) {
450  mp3->delay = (1 << 12) - 1;
451  av_log(s, AV_LOG_WARNING, "Too many samples of initial padding.\n");
452  }
453  if (mp3->padding >= 1 << 12) {
454  mp3->padding = (1 << 12) - 1;
455  av_log(s, AV_LOG_WARNING, "Too many samples of trailing padding.\n");
456  }
457  AV_WB24(mp3->xing_frame + mp3->xing_offset + 141, (mp3->delay << 12) + mp3->padding);
458 
459  AV_WB32(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 8, mp3->audio_size);
460  AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 4, mp3->audio_crc);
461 
462  tag_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), 0, mp3->xing_frame, 190);
463  AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 2, tag_crc);
464 
465  avio_seek(s->pb, mp3->xing_frame_offset, SEEK_SET);
466  avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size);
467  avio_seek(s->pb, old_pos, SEEK_SET);
468 }
469 
471 {
472  uint8_t buf[ID3v1_TAG_SIZE];
473  MP3Context *mp3 = s->priv_data;
474 
475  if (mp3->pics_to_write) {
476  av_log(s, AV_LOG_WARNING, "No packets were sent for some of the "
477  "attached pictures.\n");
479  }
480 
481  /* write the id3v1 tag */
482  if (mp3->write_id3v1 && id3v1_create_tag(s, buf) > 0) {
483  avio_write(s->pb, buf, ID3v1_TAG_SIZE);
484  }
485 
486  if (mp3->xing_offset)
488 
489  return 0;
490 }
491 
492 static int query_codec(enum AVCodecID id, int std_compliance)
493 {
495  while(cm->id != AV_CODEC_ID_NONE) {
496  if(id == cm->id)
497  return MKTAG('A', 'P', 'I', 'C');
498  cm++;
499  }
500  return -1;
501 }
502 
503 static const AVOption options[] = {
504  { "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
505  offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 0, 4, AV_OPT_FLAG_ENCODING_PARAM},
506  { "write_id3v1", "Enable ID3v1 writing. ID3v1 tags are written in UTF-8 which may not be supported by most software.",
507  offsetof(MP3Context, write_id3v1), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
508  { "write_xing", "Write the Xing header containing file duration.",
509  offsetof(MP3Context, write_xing), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
510  { NULL },
511 };
512 
513 static const AVClass mp3_muxer_class = {
514  .class_name = "MP3 muxer",
515  .item_name = av_default_item_name,
516  .option = options,
517  .version = LIBAVUTIL_VERSION_INT,
518 };
519 
521 {
522  MP3Context *mp3 = s->priv_data;
523 
524  if (pkt->stream_index == mp3->audio_stream_idx) {
525  if (mp3->pics_to_write) {
526  /* buffer audio packets until we get all the pictures */
527  int ret = avpriv_packet_list_put(&mp3->queue, &mp3->queue_end, pkt, av_packet_ref, 0);
528 
529  if (ret < 0) {
530  av_log(s, AV_LOG_WARNING, "Not enough memory to buffer audio. Skipping picture streams\n");
531  mp3->pics_to_write = 0;
533  return mp3_write_audio_packet(s, pkt);
534  }
535  } else
536  return mp3_write_audio_packet(s, pkt);
537  } else {
538  int ret;
539 
540  /* warn only once for each stream */
541  if (s->streams[pkt->stream_index]->nb_frames == 1) {
542  av_log(s, AV_LOG_WARNING, "Got more than one picture in stream %d,"
543  " ignoring.\n", pkt->stream_index);
544  }
545  if (!mp3->pics_to_write || s->streams[pkt->stream_index]->nb_frames >= 1)
546  return 0;
547 
548  if ((ret = ff_id3v2_write_apic(s, &mp3->id3, pkt)) < 0)
549  return ret;
550  mp3->pics_to_write--;
551 
552  /* flush the buffered audio packets */
553  if (!mp3->pics_to_write &&
554  (ret = mp3_queue_flush(s)) < 0)
555  return ret;
556  }
557 
558  return 0;
559 }
560 
561 /**
562  * Write an ID3v2 header at beginning of stream
563  */
564 
565 static int mp3_init(struct AVFormatContext *s)
566 {
567  MP3Context *mp3 = s->priv_data;
568  int i;
569 
570  if (mp3->id3v2_version &&
571  mp3->id3v2_version != 3 &&
572  mp3->id3v2_version != 4) {
573  av_log(s, AV_LOG_ERROR, "Invalid ID3v2 version requested: %d. Only "
574  "3, 4 or 0 (disabled) are allowed.\n", mp3->id3v2_version);
575  return AVERROR(EINVAL);
576  }
577 
578  /* check the streams -- we want exactly one audio and arbitrary number of
579  * video (attached pictures) */
580  mp3->audio_stream_idx = -1;
581  for (i = 0; i < s->nb_streams; i++) {
582  AVStream *st = s->streams[i];
583  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
584  if (mp3->audio_stream_idx >= 0 || st->codecpar->codec_id != AV_CODEC_ID_MP3) {
585  av_log(s, AV_LOG_ERROR, "Invalid audio stream. Exactly one MP3 "
586  "audio stream is required.\n");
587  return AVERROR(EINVAL);
588  }
589  mp3->audio_stream_idx = i;
590  } else if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
591  av_log(s, AV_LOG_ERROR, "Only audio streams and pictures are allowed in MP3.\n");
592  return AVERROR(EINVAL);
593  }
594  }
595  if (mp3->audio_stream_idx < 0) {
596  av_log(s, AV_LOG_ERROR, "No audio stream present.\n");
597  return AVERROR(EINVAL);
598  }
599  mp3->pics_to_write = s->nb_streams - 1;
600 
601  if (mp3->pics_to_write && !mp3->id3v2_version) {
602  av_log(s, AV_LOG_ERROR, "Attached pictures were requested, but the "
603  "ID3v2 header is disabled.\n");
604  return AVERROR(EINVAL);
605  }
606 
607  return 0;
608 }
609 
610 static int mp3_write_header(struct AVFormatContext *s)
611 {
612  MP3Context *mp3 = s->priv_data;
613  int ret;
614 
615  if (mp3->id3v2_version) {
617  ret = ff_id3v2_write_metadata(s, &mp3->id3);
618  if (ret < 0)
619  return ret;
620  }
621 
622  if (!mp3->pics_to_write) {
623  if (mp3->id3v2_version)
624  ff_id3v2_finish(&mp3->id3, s->pb, s->metadata_header_padding);
625  mp3_write_xing(s);
626  }
627 
628  return 0;
629 }
630 
631 static void mp3_deinit(struct AVFormatContext *s)
632 {
633  MP3Context *mp3 = s->priv_data;
634 
636  av_freep(&mp3->xing_frame);
637 }
638 
640  .name = "mp3",
641  .long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
642  .mime_type = "audio/mpeg",
643  .extensions = "mp3",
644  .priv_data_size = sizeof(MP3Context),
645  .audio_codec = AV_CODEC_ID_MP3,
646  .video_codec = AV_CODEC_ID_PNG,
647  .init = mp3_init,
651  .deinit = mp3_deinit,
654  .priv_class = &mp3_muxer_class,
655 };
static double val(void *priv, double ch)
Definition: aeval.c:76
channels
Definition: aptx.h:33
#define av_unused
Definition: attributes.h:131
uint8_t
int32_t
simple assert() macros that are a bit more flexible than ISO C assert().
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
Main libavformat public API header.
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:462
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:203
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:383
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:461
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
void avio_wb24(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:473
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:1427
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:225
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
Definition: aviobuf.c:1382
static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
Definition: avio_internal.h:58
void ffio_fill(AVIOContext *s, int b, int count)
Definition: aviobuf.c:211
void avpriv_packet_list_free(PacketList **pkt_buf, PacketList **pkt_buf_end)
Wipe the list and unref all the packets in it.
Definition: avpacket.c:806
int avpriv_packet_list_get(PacketList **pkt_buffer, PacketList **pkt_buffer_end, AVPacket *pkt)
Remove the oldest AVPacket in the list and return it.
Definition: avpacket.c:790
int avpriv_packet_list_put(PacketList **packet_buffer, PacketList **plast_pktl, AVPacket *pkt, int(*copy)(AVPacket *dst, const AVPacket *src), int flags)
Append an AVPacket to the list.
Definition: avpacket.c:753
uint8_t * av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type, buffer_size_t *size)
Definition: avpacket.c:368
#define AV_RB32
Definition: intreadwrite.h:130
#define AV_RL32
Definition: intreadwrite.h:146
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define FFMIN(a, b)
Definition: common.h:105
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define MKBETAG(a, b, c, d)
Definition: common.h:479
#define FFMAX(a, b)
Definition: common.h:103
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
#define NULL
Definition: coverity.c:32
Public header for CRC hash function implementation.
Public dictionary API.
#define cm
Definition: dvbsubdec.c:37
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:729
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:346
@ AV_OPT_TYPE_INT
Definition: opt.h:225
@ AV_OPT_TYPE_BOOL
Definition: opt.h:242
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
@ AV_CODEC_ID_PNG
Definition: codec_id.h:110
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:425
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:634
int av_packet_ref(AVPacket *dst, const AVPacket *src)
Setup a new reference to the data described by a given packet.
Definition: avpacket.c:641
@ AV_PKT_DATA_SKIP_SAMPLES
Recommmends skipping the specified number of samples.
Definition: packet.h:156
@ AV_PKT_DATA_REPLAYGAIN
This side data should be associated with an audio stream and contains ReplayGain information in form ...
Definition: packet.h:99
uint8_t * av_stream_get_side_data(const AVStream *stream, enum AVPacketSideDataType type, size_t *size)
Get side information from stream.
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:374
uint32_t AVCRC
Definition: crc.h:47
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition: crc.c:392
@ AV_CRC_16_ANSI_LE
Definition: crc.h:55
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:40
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
Definition: avstring.c:215
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
const char * key
const char *const ff_id3v1_genre_str[ID3v1_GENRE_MAX+1]
ID3v1 genres.
Definition: id3v1.c:27
#define ID3v1_TAG_SIZE
Definition: id3v1.h:27
#define ID3v1_GENRE_MAX
Definition: id3v1.h:29
const CodecMime ff_id3v2_mime_tags[]
Definition: id3v2.c:131
void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version, const char *magic)
Initialize an ID3v2 tag.
Definition: id3v2enc.c:205
void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb, int padding_bytes)
Finalize an opened ID3v2 tag.
Definition: id3v2enc.c:420
int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3)
Convert and write all global metadata from s into an ID3v2 tag.
Definition: id3v2enc.c:330
int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt)
Write an attached picture from pkt into an ID3v2 tag.
Definition: id3v2enc.c:351
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
int i
Definition: input.c:407
#define AV_WB24(p, d)
Definition: intreadwrite.h:450
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:29
int buffer_size_t
Definition: internal.h:306
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static const uint16_t mask[17]
Definition: lzw.c:38
uint32_t tag
Definition: movenc.c:1611
static void mp3_update_xing(AVFormatContext *s)
Definition: mp3enc.c:399
static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mp3enc.c:316
static int mp3_queue_flush(AVFormatContext *s)
Definition: mp3enc.c:381
static const AVClass mp3_muxer_class
Definition: mp3enc.c:513
static const AVOption options[]
Definition: mp3enc.c:503
static void mp3_xing_add_frame(MP3Context *mp3, AVPacket *pkt)
Definition: mp3enc.c:290
#define XING_NUM_BAGS
Definition: mp3enc.c:93
static const uint8_t xing_offtbl[2][2]
Definition: mp3enc.c:138
static int mp3_init(struct AVFormatContext *s)
Write an ID3v2 header at beginning of stream.
Definition: mp3enc.c:565
static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
Definition: mp3enc.c:50
static int query_codec(enum AVCodecID id, int std_compliance)
Definition: mp3enc.c:492
static int mp3_write_xing(AVFormatContext *s)
Definition: mp3enc.c:143
static void mp3_deinit(struct AVFormatContext *s)
Definition: mp3enc.c:631
static int mp3_write_header(struct AVFormatContext *s)
Definition: mp3enc.c:610
static int id3v1_set_string(AVFormatContext *s, const char *key, uint8_t *buf, int buf_size)
Definition: mp3enc.c:40
AVOutputFormat ff_mp3_muxer
Definition: mp3enc.c:639
#define XING_SIZE
Definition: mp3enc.c:96
static int mp3_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mp3enc.c:520
#define XING_TOC_SIZE
Definition: mp3enc.c:94
static int mp3_write_trailer(struct AVFormatContext *s)
Definition: mp3enc.c:470
mpeg audio declarations for both encoder and decoder.
#define MPA_MONO
Definition: mpegaudio.h:49
#define MPA_STEREO
Definition: mpegaudio.h:46
const uint16_t avpriv_mpa_freq_tab[3]
Definition: mpegaudiodata.c:40
const uint16_t avpriv_mpa_bitrate_tab[2][3][15]
Definition: mpegaudiodata.c:30
mpeg audio layer common tables.
int avpriv_mpegaudio_decode_header(MPADecodeHeader *s, uint32_t header)
MPEG Audio header decoder.
AVOptions.
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:278
static const uint8_t header[24]
Definition: sdr2.c:67
#define FF_ARRAY_ELEMS(a)
Describe the class of an AVClass context structure.
Definition: log.h:67
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
int channels
Audio only.
Definition: codec_par.h:166
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
char * value
Definition: dict.h:83
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
AVOption.
Definition: opt.h:248
const char * name
Definition: avformat.h:491
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
int size
Definition: packet.h:370
uint8_t * data
Definition: packet.h:369
ReplayGain information (see http://wiki.hydrogenaudio.org/index.php?title=ReplayGain_1....
Definition: replaygain.h:29
uint32_t track_peak
Peak track amplitude, with 100000 representing full scale (but values may overflow).
Definition: replaygain.h:39
int32_t track_gain
Track replay gain in microbels (divide by 100000 to get the value in dB).
Definition: replaygain.h:34
int32_t album_gain
Same as track_gain, but for the whole album.
Definition: replaygain.h:43
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
ID3v2EncContext id3
Definition: mp3enc.c:100
PacketList * queue
Definition: mp3enc.c:135
uint32_t want
Definition: mp3enc.c:120
int pics_to_write
Definition: mp3enc.c:132
uint64_t bag[XING_NUM_BAGS]
Definition: mp3enc.c:123
int xing_frame_size
Definition: mp3enc.c:108
int initial_bitrate
Definition: mp3enc.c:124
uint32_t audio_size
Definition: mp3enc.c:111
AVCRC audio_crc
Definition: mp3enc.c:110
int id3v2_version
Definition: mp3enc.c:101
int audio_stream_idx
Definition: mp3enc.c:130
int write_xing
Definition: mp3enc.c:103
int padding
Definition: mp3enc.c:127
int xing_offset
Definition: mp3enc.c:116
int32_t frames
Definition: mp3enc.c:118
uint8_t * xing_frame
Definition: mp3enc.c:107
int write_id3v1
Definition: mp3enc.c:102
int64_t xing_frame_offset
Definition: mp3enc.c:114
int has_variable_bitrate
Definition: mp3enc.c:125
int32_t size
Definition: mp3enc.c:119
uint32_t pos
Definition: mp3enc.c:122
int delay
Definition: mp3enc.c:126
uint32_t seen
Definition: mp3enc.c:121
PacketList * queue_end
Definition: mp3enc.c:135
#define av_freep(p)
#define av_log(a,...)
static void error(const char *err)
AVPacket * pkt
Definition: movenc.c:59
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:98
uint8_t base
Definition: vp3data.h:141