FFmpeg
mp3enc.c
Go to the documentation of this file.
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;
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 
209  ret = avpriv_mpegaudio_decode_header(&mpah, header);
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 
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;
394  av_packet_unref(&pkt);
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");
478  mp3_queue_flush(s);
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)
487  mp3_update_xing(s);
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;
532  mp3_queue_flush(s);
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)
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 };
#define MPA_STEREO
Definition: mpegaudio.h:46
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:729
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define XING_NUM_BAGS
Definition: mp3enc.c:93
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
Definition: aviobuf.c:1424
AVOption.
Definition: opt.h:248
void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version, const char *magic)
Initialize an ID3v2 tag.
Definition: id3v2enc.c:205
static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mp3enc.c:316
int64_t xing_frame_offset
Definition: mp3enc.c:114
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb, int padding_bytes)
Finalize an opened ID3v2 tag.
Definition: id3v2enc.c:420
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
uint32_t pos
Definition: mp3enc.c:122
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int size
Definition: packet.h:370
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
PacketList * queue_end
Definition: mp3enc.c:135
#define FF_ARRAY_ELEMS(a)
const char * key
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
AVPacket * pkt
Definition: movenc.c:59
static void error(const char *err)
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
Definition: aviobuf.c:1379
mpeg audio layer common tables.
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
uint64_t bag[XING_NUM_BAGS]
Definition: mp3enc.c:123
uint32_t track_peak
Peak track amplitude, with 100000 representing full scale (but values may overflow).
Definition: replaygain.h:39
uint8_t base
Definition: vp3data.h:141
Format I/O context.
Definition: avformat.h:1247
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
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
Public dictionary API.
static void mp3_update_xing(AVFormatContext *s)
Definition: mp3enc.c:399
int32_t size
Definition: mp3enc.c:119
static int mp3_write_trailer(struct AVFormatContext *s)
Definition: mp3enc.c:470
uint8_t
int delay
Definition: mp3enc.c:126
AVOptions.
const uint16_t avpriv_mpa_freq_tab[3]
Definition: mpegaudiodata.c:40
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:91
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1315
Public header for CRC hash function implementation.
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
uint8_t * data
Definition: packet.h:369
int avpriv_mpegaudio_decode_header(MPADecodeHeader *s, uint32_t header)
uint32_t tag
Definition: movenc.c:1600
static const uint8_t xing_offtbl[2][2]
Definition: mp3enc.c:138
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
enum AVCodecID id
Definition: internal.h:49
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
static const uint8_t header[24]
Definition: sdr2.c:67
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:225
static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
Definition: avio_internal.h:58
channels
Definition: aptx.h:33
uint8_t * av_stream_get_side_data(const AVStream *stream, enum AVPacketSideDataType type, size_t *size)
Get side information from stream.
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
AVCRC audio_crc
Definition: mp3enc.c:110
int32_t album_gain
Same as track_gain, but for the whole album.
Definition: replaygain.h:43
#define av_log(a,...)
#define cm
Definition: dvbsubdec.c:37
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:278
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
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
#define U(x)
Definition: vp56_arith.h:37
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1489
static const uint16_t mask[17]
Definition: lzw.c:38
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
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:425
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
simple assert() macros that are a bit more flexible than ISO C assert().
uint8_t * av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type, buffer_size_t *size)
Definition: avpacket.c:368
uint32_t want
Definition: mp3enc.c:120
GLsizei count
Definition: opengl_enc.c:108
#define FFMAX(a, b)
Definition: common.h:103
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
int initial_bitrate
Definition: mp3enc.c:124
const CodecMime ff_id3v2_mime_tags[]
Definition: id3v2.c:131
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1303
static int mp3_write_xing(AVFormatContext *s)
Definition: mp3enc.c:143
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
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
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
void ffio_fill(AVIOContext *s, int b, int count)
Definition: aviobuf.c:211
int id3v2_version
Definition: mp3enc.c:101
#define FFMIN(a, b)
Definition: common.h:105
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
Definition: avstring.c:215
static int mp3_init(struct AVFormatContext *s)
Write an ID3v2 header at beginning of stream.
Definition: mp3enc.c:565
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:98
void avio_wb24(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:473
const char * name
Definition: avformat.h:500
static int query_codec(enum AVCodecID id, int std_compliance)
Definition: mp3enc.c:492
int32_t
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
#define AV_WB24(p, d)
Definition: intreadwrite.h:450
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
#define s(width, name)
Definition: cbs_vp9.c:257
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:29
AVDictionary * metadata
Definition: avformat.h:948
int padding
Definition: mp3enc.c:127
int write_id3v1
Definition: mp3enc.c:102
int metadata_header_padding
Number of bytes to be written as padding in a metadata header.
Definition: avformat.h:1761
Stream structure.
Definition: avformat.h:884
int pics_to_write
Definition: mp3enc.c:132
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:462
PacketList * queue
Definition: mp3enc.c:135
static const AVClass mp3_muxer_class
Definition: mp3enc.c:513
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
int has_variable_bitrate
Definition: mp3enc.c:125
int audio_stream_idx
Definition: mp3enc.c:130
int xing_offset
Definition: mp3enc.c:116
AVIOContext * pb
I/O context.
Definition: avformat.h:1289
int32_t frames
Definition: mp3enc.c:118
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:203
static const AVOption options[]
Definition: mp3enc.c:503
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:634
int xing_frame_size
Definition: mp3enc.c:108
Describe the class of an AVClass context structure.
Definition: log.h:67
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
Recommmends skipping the specified number of samples.
Definition: packet.h:156
uint8_t * xing_frame
Definition: mp3enc.c:107
#define MPA_MONO
Definition: mpegaudio.h:49
#define XING_SIZE
Definition: mp3enc.c:96
uint32_t audio_size
Definition: mp3enc.c:111
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:461
#define flags(name, subs,...)
Definition: cbs_av1.c:561
This side data should be associated with an audio stream and contains ReplayGain information in form ...
Definition: packet.h:99
static int id3v1_set_string(AVFormatContext *s, const char *key, uint8_t *buf, int buf_size)
Definition: mp3enc.c:40
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
int write_xing
Definition: mp3enc.c:103
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:374
int sample_rate
Audio only.
Definition: codec_par.h:170
MPEG Audio header decoder.
static int mp3_queue_flush(AVFormatContext *s)
Definition: mp3enc.c:381
Main libavformat public API header.
AVOutputFormat ff_mp3_muxer
Definition: mp3enc.c:639
static int mp3_write_header(struct AVFormatContext *s)
Definition: mp3enc.c:610
mpeg audio declarations for both encoder and decoder.
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:935
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
#define MKBETAG(a, b, c, d)
Definition: common.h:479
static void mp3_deinit(struct AVFormatContext *s)
Definition: mp3enc.c:631
#define XING_TOC_SIZE
Definition: mp3enc.c:94
char * value
Definition: dict.h:87
void * priv_data
Format private data.
Definition: avformat.h:1275
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:346
int channels
Audio only.
Definition: codec_par.h:166
#define ID3v1_TAG_SIZE
Definition: id3v1.h:27
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:383
#define av_freep(p)
int32_t track_gain
Track replay gain in microbels (divide by 100000 to get the value in dB).
Definition: replaygain.h:34
const uint16_t avpriv_mpa_bitrate_tab[2][3][15]
Definition: mpegaudiodata.c:30
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1049
int stream_index
Definition: packet.h:371
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
Definition: mp3enc.c:50
#define MKTAG(a, b, c, d)
Definition: common.h:478
ReplayGain information (see http://wiki.hydrogenaudio.org/index.php?title=ReplayGain_1.0_specification).
Definition: replaygain.h:29
static int mp3_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mp3enc.c:520
#define ID3v1_GENRE_MAX
Definition: id3v1.h:29
const char *const ff_id3v1_genre_str[ID3v1_GENRE_MAX+1]
ID3v1 genres.
Definition: id3v1.c:27
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:91
static double val(void *priv, double ch)
Definition: aeval.c:76
This structure stores compressed data.
Definition: packet.h:346
uint32_t AVCRC
Definition: crc.h:47
ID3v2EncContext id3
Definition: mp3enc.c:100
int i
Definition: input.c:407
#define av_unused
Definition: attributes.h:131
static void mp3_xing_add_frame(MP3Context *mp3, AVPacket *pkt)
Definition: mp3enc.c:290
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
uint32_t seen
Definition: mp3enc.c:121