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avienc.c
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1 /*
2  * AVI muxer
3  * Copyright (c) 2000 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 //#define DEBUG
23 
24 #include "avformat.h"
25 #include "internal.h"
26 #include "avi.h"
27 #include "avio_internal.h"
28 #include "riff.h"
29 #include "mpegts.h"
30 #include "libavformat/avlanguage.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/avassert.h"
35 #include "libavutil/timestamp.h"
36 #include "libavutil/pixdesc.h"
37 #include "libavcodec/raw.h"
38 
39 /*
40  * TODO:
41  * - fill all fields if non streamed (nb_frames for example)
42  */
43 
44 typedef struct AVIIentry {
45  unsigned int flags, pos, len;
46 } AVIIentry;
47 
48 #define AVI_INDEX_CLUSTER_SIZE 16384
49 
50 typedef struct AVIIndex {
51  int64_t indx_start;
52  int entry;
55 } AVIIndex;
56 
57 typedef struct {
58  int64_t riff_start, movi_list, odml_list;
59  int64_t frames_hdr_all;
60  int riff_id;
61 } AVIContext;
62 
63 typedef struct {
64  int64_t frames_hdr_strm;
67  int entry;
68  int max_size;
69 
70  int64_t last_dts;
71 
73 } AVIStream;
74 
76 
77 static inline AVIIentry *avi_get_ientry(const AVIIndex *idx, int ent_id)
78 {
79  int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
80  int id = ent_id % AVI_INDEX_CLUSTER_SIZE;
81  return &idx->cluster[cl][id];
82 }
83 
85  const char *riff_tag, const char *list_tag)
86 {
87  AVIContext *avi = s->priv_data;
88  int64_t loff;
89  int i;
90 
91  avi->riff_id++;
92  for (i = 0; i < s->nb_streams; i++) {
93  AVIStream *avist = s->streams[i]->priv_data;
94  avist->indexes.entry = 0;
95  }
96 
97  avi->riff_start = ff_start_tag(pb, "RIFF");
98  ffio_wfourcc(pb, riff_tag);
99  loff = ff_start_tag(pb, "LIST");
100  ffio_wfourcc(pb, list_tag);
101  return loff;
102 }
103 
104 static char *avi_stream2fourcc(char *tag, int index, enum AVMediaType type)
105 {
106  tag[0] = '0' + index / 10;
107  tag[1] = '0' + index % 10;
108  if (type == AVMEDIA_TYPE_VIDEO) {
109  tag[2] = 'd';
110  tag[3] = 'c';
111  } else if (type == AVMEDIA_TYPE_SUBTITLE) {
112  // note: this is not an official code
113  tag[2] = 's';
114  tag[3] = 'b';
115  } else {
116  tag[2] = 'w';
117  tag[3] = 'b';
118  }
119  tag[4] = '\0';
120  return tag;
121 }
122 
123 static int avi_write_counters(AVFormatContext *s, int riff_id)
124 {
125  AVIOContext *pb = s->pb;
126  AVIContext *avi = s->priv_data;
127  int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
128  int64_t file_size;
129  AVCodecContext *stream;
130 
131  file_size = avio_tell(pb);
132  for (n = 0; n < s->nb_streams; n++) {
133  AVIStream *avist = s->streams[n]->priv_data;
134 
135  av_assert0(avist->frames_hdr_strm);
136  stream = s->streams[n]->codec;
137  avio_seek(pb, avist->frames_hdr_strm, SEEK_SET);
138  ff_parse_specific_params(s->streams[n], &au_byterate, &au_ssize, &au_scale);
139  if (au_ssize == 0)
140  avio_wl32(pb, avist->packet_count);
141  else
142  avio_wl32(pb, avist->audio_strm_length / au_ssize);
143  if (stream->codec_type == AVMEDIA_TYPE_VIDEO)
144  nb_frames = FFMAX(nb_frames, avist->packet_count);
145  }
146  if (riff_id == 1) {
148  avio_seek(pb, avi->frames_hdr_all, SEEK_SET);
149  avio_wl32(pb, nb_frames);
150  }
151  avio_seek(pb, file_size, SEEK_SET);
152 
153  return 0;
154 }
155 
157 {
158  AVIContext *avi = s->priv_data;
159  AVIOContext *pb = s->pb;
160  int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
161  AVCodecContext *video_enc;
162  AVStream *video_st = NULL;
163  int64_t list1, list2, strh, strf;
164  AVDictionaryEntry *t = NULL;
165  int padding;
166 
167  if (s->nb_streams > AVI_MAX_STREAM_COUNT) {
168  av_log(s, AV_LOG_ERROR, "AVI does not support >%d streams\n",
170  return AVERROR(EINVAL);
171  }
172 
173  for (n = 0; n < s->nb_streams; n++) {
174  s->streams[n]->priv_data = av_mallocz(sizeof(AVIStream));
175  if (!s->streams[n]->priv_data)
176  return AVERROR(ENOMEM);
177  }
178 
179  /* header list */
180  avi->riff_id = 0;
181  list1 = avi_start_new_riff(s, pb, "AVI ", "hdrl");
182 
183  /* avi header */
184  ffio_wfourcc(pb, "avih");
185  avio_wl32(pb, 14 * 4);
186  bitrate = 0;
187 
188  video_enc = NULL;
189  for (n = 0; n < s->nb_streams; n++) {
190  AVCodecContext *codec = s->streams[n]->codec;
191  bitrate += codec->bit_rate;
192  if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
193  video_enc = codec;
194  video_st = s->streams[n];
195  }
196  }
197 
198  nb_frames = 0;
199 
200  // TODO: should be avg_frame_rate
201  if (video_st)
202  avio_wl32(pb, (uint32_t) (INT64_C(1000000) * video_st->time_base.num /
203  video_st->time_base.den));
204  else
205  avio_wl32(pb, 0);
206  avio_wl32(pb, bitrate / 8); /* XXX: not quite exact */
207  avio_wl32(pb, 0); /* padding */
208  if (!pb->seekable)
209  avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
210  else
212  avi->frames_hdr_all = avio_tell(pb); /* remember this offset to fill later */
213  avio_wl32(pb, nb_frames); /* nb frames, filled later */
214  avio_wl32(pb, 0); /* initial frame */
215  avio_wl32(pb, s->nb_streams); /* nb streams */
216  avio_wl32(pb, 1024 * 1024); /* suggested buffer size */
217  if (video_enc) {
218  avio_wl32(pb, video_enc->width);
219  avio_wl32(pb, video_enc->height);
220  } else {
221  avio_wl32(pb, 0);
222  avio_wl32(pb, 0);
223  }
224  avio_wl32(pb, 0); /* reserved */
225  avio_wl32(pb, 0); /* reserved */
226  avio_wl32(pb, 0); /* reserved */
227  avio_wl32(pb, 0); /* reserved */
228 
229  /* stream list */
230  for (i = 0; i < n; i++) {
231  AVStream *st = s->streams[i];
232  AVCodecContext *enc = st->codec;
233  AVIStream *avist = st->priv_data;
234  list2 = ff_start_tag(pb, "LIST");
235  ffio_wfourcc(pb, "strl");
236 
237  /* stream generic header */
238  strh = ff_start_tag(pb, "strh");
239  switch (enc->codec_type) {
241  // XSUB subtitles behave like video tracks, other subtitles
242  // are not (yet) supported.
243  if (enc->codec_id != AV_CODEC_ID_XSUB) {
244  av_log(s, AV_LOG_ERROR,
245  "Subtitle streams other than DivX XSUB are not supported by the AVI muxer.\n");
246  return AVERROR_PATCHWELCOME;
247  }
248  case AVMEDIA_TYPE_VIDEO:
249  ffio_wfourcc(pb, "vids");
250  break;
251  case AVMEDIA_TYPE_AUDIO:
252  ffio_wfourcc(pb, "auds");
253  break;
254 // case AVMEDIA_TYPE_TEXT:
255 // ffio_wfourcc(pb, "txts");
256 // break;
257  case AVMEDIA_TYPE_DATA:
258  ffio_wfourcc(pb, "dats");
259  break;
260  }
261  if (enc->codec_type == AVMEDIA_TYPE_VIDEO ||
262  enc->codec_id == AV_CODEC_ID_XSUB)
263  avio_wl32(pb, enc->codec_tag);
264  else
265  avio_wl32(pb, 1);
266  avio_wl32(pb, 0); /* flags */
267  avio_wl16(pb, 0); /* priority */
268  avio_wl16(pb, 0); /* language */
269  avio_wl32(pb, 0); /* initial frame */
270 
271  ff_parse_specific_params(st, &au_byterate, &au_ssize, &au_scale);
272 
273  if ( enc->codec_type == AVMEDIA_TYPE_VIDEO
274  && enc->codec_id != AV_CODEC_ID_XSUB
275  && au_byterate > 1000LL*au_scale) {
276  au_byterate = 600;
277  au_scale = 1;
278  }
279  avpriv_set_pts_info(st, 64, au_scale, au_byterate);
280  if (enc->codec_id == AV_CODEC_ID_XSUB)
281  au_scale = au_byterate = 0;
282 
283  avio_wl32(pb, au_scale); /* scale */
284  avio_wl32(pb, au_byterate); /* rate */
285 
286  avio_wl32(pb, 0); /* start */
287  /* remember this offset to fill later */
288  avist->frames_hdr_strm = avio_tell(pb);
289  if (!pb->seekable)
290  /* FIXME: this may be broken, but who cares */
292  else
293  avio_wl32(pb, 0); /* length, XXX: filled later */
294 
295  /* suggested buffer size, is set to largest chunk size in avi_write_trailer */
296  if (enc->codec_type == AVMEDIA_TYPE_VIDEO)
297  avio_wl32(pb, 1024 * 1024);
298  else if (enc->codec_type == AVMEDIA_TYPE_AUDIO)
299  avio_wl32(pb, 12 * 1024);
300  else
301  avio_wl32(pb, 0);
302  avio_wl32(pb, -1); /* quality */
303  avio_wl32(pb, au_ssize); /* sample size */
304  avio_wl32(pb, 0);
305  avio_wl16(pb, enc->width);
306  avio_wl16(pb, enc->height);
307  ff_end_tag(pb, strh);
308 
309  if (enc->codec_type != AVMEDIA_TYPE_DATA) {
310  int ret;
311  enum AVPixelFormat pix_fmt;
312 
313  strf = ff_start_tag(pb, "strf");
314  switch (enc->codec_type) {
316  /* XSUB subtitles behave like video tracks, other subtitles
317  * are not (yet) supported. */
318  if (enc->codec_id != AV_CODEC_ID_XSUB)
319  break;
320  case AVMEDIA_TYPE_VIDEO:
321  /* WMP expects RGB 5:5:5 rawvideo in avi to have bpp set to 16. */
322  if ( !enc->codec_tag
323  && enc->codec_id == AV_CODEC_ID_RAWVIDEO
324  && enc->pix_fmt == AV_PIX_FMT_RGB555LE
325  && enc->bits_per_coded_sample == 15)
326  enc->bits_per_coded_sample = 16;
327  ff_put_bmp_header(pb, enc, ff_codec_bmp_tags, 0, 0);
329  enc->bits_per_coded_sample);
330  if ( !enc->codec_tag
331  && enc->codec_id == AV_CODEC_ID_RAWVIDEO
332  && enc->pix_fmt != pix_fmt
333  && enc->pix_fmt != AV_PIX_FMT_NONE)
334  av_log(s, AV_LOG_ERROR, "%s rawvideo cannot be written to avi, output file will be unreadable\n",
336  break;
337  case AVMEDIA_TYPE_AUDIO:
338  if ((ret = ff_put_wav_header(pb, enc, 0)) < 0)
339  return ret;
340  break;
341  default:
342  av_log(s, AV_LOG_ERROR,
343  "Invalid or not supported codec type '%s' found in the input\n",
344  (char *)av_x_if_null(av_get_media_type_string(enc->codec_type), "?"));
345  return AVERROR(EINVAL);
346  }
347  ff_end_tag(pb, strf);
348  if ((t = av_dict_get(st->metadata, "title", NULL, 0))) {
349  ff_riff_write_info_tag(s->pb, "strn", t->value);
350  t = NULL;
351  }
352  if (enc->codec_id == AV_CODEC_ID_XSUB
353  && (t = av_dict_get(s->streams[i]->metadata, "language", NULL, 0))) {
354  const char* langstr = av_convert_lang_to(t->value, AV_LANG_ISO639_1);
355  t = NULL;
356  if (langstr) {
357  char* str = av_asprintf("Subtitle - %s-xx;02", langstr);
358  ff_riff_write_info_tag(s->pb, "strn", str);
359  av_free(str);
360  }
361  }
362  }
363 
364  if (pb->seekable) {
365  unsigned char tag[5];
366  int j;
367 
368  /* Starting to lay out AVI OpenDML master index.
369  * We want to make it JUNK entry for now, since we'd
370  * like to get away without making AVI an OpenDML one
371  * for compatibility reasons. */
372  avist->indexes.entry = avist->indexes.ents_allocated = 0;
373  avist->indexes.indx_start = ff_start_tag(pb, "JUNK");
374  avio_wl16(pb, 4); /* wLongsPerEntry */
375  avio_w8(pb, 0); /* bIndexSubType (0 == frame index) */
376  avio_w8(pb, 0); /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
377  avio_wl32(pb, 0); /* nEntriesInUse (will fill out later on) */
378  ffio_wfourcc(pb, avi_stream2fourcc(tag, i, enc->codec_type));
379  /* dwChunkId */
380  avio_wl64(pb, 0); /* dwReserved[3] */
381  // avio_wl32(pb, 0); /* Must be 0. */
382  for (j = 0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
383  avio_wl64(pb, 0);
384  ff_end_tag(pb, avist->indexes.indx_start);
385  }
386 
387  if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
388  st->sample_aspect_ratio.num > 0 &&
389  st->sample_aspect_ratio.den > 0) {
390  int vprp = ff_start_tag(pb, "vprp");
392  (AVRational) { enc->width,
393  enc->height });
394  int num, den;
395  av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
396 
397  avio_wl32(pb, 0); // video format = unknown
398  avio_wl32(pb, 0); // video standard = unknown
399  // TODO: should be avg_frame_rate
400  avio_wl32(pb, lrintf(1.0 / av_q2d(st->time_base)));
401  avio_wl32(pb, enc->width);
402  avio_wl32(pb, enc->height);
403  avio_wl16(pb, den);
404  avio_wl16(pb, num);
405  avio_wl32(pb, enc->width);
406  avio_wl32(pb, enc->height);
407  avio_wl32(pb, 1); // progressive FIXME
408 
409  avio_wl32(pb, enc->height);
410  avio_wl32(pb, enc->width);
411  avio_wl32(pb, enc->height);
412  avio_wl32(pb, enc->width);
413  avio_wl32(pb, 0);
414  avio_wl32(pb, 0);
415 
416  avio_wl32(pb, 0);
417  avio_wl32(pb, 0);
418  ff_end_tag(pb, vprp);
419  }
420 
421  ff_end_tag(pb, list2);
422  }
423 
424  if (pb->seekable) {
425  /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
426  avi->odml_list = ff_start_tag(pb, "JUNK");
427  ffio_wfourcc(pb, "odml");
428  ffio_wfourcc(pb, "dmlh");
429  avio_wl32(pb, 248);
430  for (i = 0; i < 248; i += 4)
431  avio_wl32(pb, 0);
432  ff_end_tag(pb, avi->odml_list);
433  }
434 
435  ff_end_tag(pb, list1);
436 
438 
439 
440  padding = s->metadata_header_padding;
441  if (padding < 0)
442  padding = 1016;
443 
444  /* some padding for easier tag editing */
445  if (padding) {
446  list2 = ff_start_tag(pb, "JUNK");
447  for (i = padding; i > 0; i -= 4)
448  avio_wl32(pb, 0);
449  ff_end_tag(pb, list2);
450  }
451 
452  avi->movi_list = ff_start_tag(pb, "LIST");
453  ffio_wfourcc(pb, "movi");
454 
455  avio_flush(pb);
456 
457  return 0;
458 }
459 
461 {
462  AVIOContext *pb = s->pb;
463  AVIContext *avi = s->priv_data;
464  char tag[5];
465  char ix_tag[] = "ix00";
466  int i, j;
467 
468  av_assert0(pb->seekable);
469 
470  if (avi->riff_id > AVI_MASTER_INDEX_SIZE) {
471  av_log(s, AV_LOG_ERROR, "Invalid riff index %d > %d\n",
473  return AVERROR(EINVAL);
474  }
475 
476  for (i = 0; i < s->nb_streams; i++) {
477  AVIStream *avist = s->streams[i]->priv_data;
478  int64_t ix, pos;
479 
480  avi_stream2fourcc(tag, i, s->streams[i]->codec->codec_type);
481  ix_tag[3] = '0' + i;
482 
483  /* Writing AVI OpenDML leaf index chunk */
484  ix = avio_tell(pb);
485  ffio_wfourcc(pb, ix_tag); /* ix?? */
486  avio_wl32(pb, avist->indexes.entry * 8 + 24);
487  /* chunk size */
488  avio_wl16(pb, 2); /* wLongsPerEntry */
489  avio_w8(pb, 0); /* bIndexSubType (0 == frame index) */
490  avio_w8(pb, 1); /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
491  avio_wl32(pb, avist->indexes.entry);
492  /* nEntriesInUse */
493  ffio_wfourcc(pb, tag); /* dwChunkId */
494  avio_wl64(pb, avi->movi_list); /* qwBaseOffset */
495  avio_wl32(pb, 0); /* dwReserved_3 (must be 0) */
496 
497  for (j = 0; j < avist->indexes.entry; j++) {
498  AVIIentry *ie = avi_get_ientry(&avist->indexes, j);
499  avio_wl32(pb, ie->pos + 8);
500  avio_wl32(pb, ((uint32_t) ie->len & ~0x80000000) |
501  (ie->flags & 0x10 ? 0 : 0x80000000));
502  }
503  avio_flush(pb);
504  pos = avio_tell(pb);
505 
506  /* Updating one entry in the AVI OpenDML master index */
507  avio_seek(pb, avist->indexes.indx_start - 8, SEEK_SET);
508  ffio_wfourcc(pb, "indx"); /* enabling this entry */
509  avio_skip(pb, 8);
510  avio_wl32(pb, avi->riff_id); /* nEntriesInUse */
511  avio_skip(pb, 16 * avi->riff_id);
512  avio_wl64(pb, ix); /* qwOffset */
513  avio_wl32(pb, pos - ix); /* dwSize */
514  avio_wl32(pb, avist->indexes.entry); /* dwDuration */
515 
516  avio_seek(pb, pos, SEEK_SET);
517  }
518  return 0;
519 }
520 
522 {
523  AVIOContext *pb = s->pb;
524  AVIContext *avi = s->priv_data;
525  int64_t idx_chunk;
526  int i;
527  char tag[5];
528 
529  if (pb->seekable) {
530  AVIStream *avist;
531  AVIIentry *ie = 0, *tie;
532  int empty, stream_id = -1;
533 
534  idx_chunk = ff_start_tag(pb, "idx1");
535  for (i = 0; i < s->nb_streams; i++) {
536  avist = s->streams[i]->priv_data;
537  avist->entry = 0;
538  }
539 
540  do {
541  empty = 1;
542  for (i = 0; i < s->nb_streams; i++) {
543  avist = s->streams[i]->priv_data;
544  if (avist->indexes.entry <= avist->entry)
545  continue;
546 
547  tie = avi_get_ientry(&avist->indexes, avist->entry);
548  if (empty || tie->pos < ie->pos) {
549  ie = tie;
550  stream_id = i;
551  }
552  empty = 0;
553  }
554  if (!empty) {
555  avist = s->streams[stream_id]->priv_data;
556  avi_stream2fourcc(tag, stream_id,
557  s->streams[stream_id]->codec->codec_type);
558  ffio_wfourcc(pb, tag);
559  avio_wl32(pb, ie->flags);
560  avio_wl32(pb, ie->pos);
561  avio_wl32(pb, ie->len);
562  avist->entry++;
563  }
564  } while (!empty);
565  ff_end_tag(pb, idx_chunk);
566 
567  avi_write_counters(s, avi->riff_id);
568  }
569  return 0;
570 }
571 
572 static int write_skip_frames(AVFormatContext *s, int stream_index, int64_t dts)
573 {
574  AVIStream *avist = s->streams[stream_index]->priv_data;
575  AVCodecContext *enc = s->streams[stream_index]->codec;
576 
577  av_dlog(s, "dts:%s packet_count:%d stream_index:%d\n", av_ts2str(dts), avist->packet_count, stream_index);
578  while (enc->block_align == 0 && dts != AV_NOPTS_VALUE &&
579  dts > avist->packet_count && enc->codec_id != AV_CODEC_ID_XSUB && avist->packet_count) {
580  AVPacket empty_packet;
581 
582  if (dts - avist->packet_count > 60000) {
583  av_log(s, AV_LOG_ERROR, "Too large number of skipped frames %"PRId64" > 60000\n", dts - avist->packet_count);
584  return AVERROR(EINVAL);
585  }
586 
587  av_init_packet(&empty_packet);
588  empty_packet.size = 0;
589  empty_packet.data = NULL;
590  empty_packet.stream_index = stream_index;
591  avi_write_packet(s, &empty_packet);
592  av_dlog(s, "dup dts:%s packet_count:%d\n", av_ts2str(dts), avist->packet_count);
593  }
594 
595  return 0;
596 }
597 
599 {
600  unsigned char tag[5];
601  unsigned int flags = 0;
602  const int stream_index = pkt->stream_index;
603  int size = pkt->size;
604  AVIContext *avi = s->priv_data;
605  AVIOContext *pb = s->pb;
606  AVIStream *avist = s->streams[stream_index]->priv_data;
607  AVCodecContext *enc = s->streams[stream_index]->codec;
608  int ret;
609 
610  if (enc->codec_id == AV_CODEC_ID_H264 && enc->codec_tag == MKTAG('H','2','6','4') && pkt->size) {
611  ret = ff_check_h264_startcode(s, s->streams[stream_index], pkt);
612  if (ret < 0)
613  return ret;
614  }
615 
616  if ((ret = write_skip_frames(s, stream_index, pkt->dts)) < 0)
617  return ret;
618 
619  if (pkt->dts != AV_NOPTS_VALUE)
620  avist->last_dts = pkt->dts + pkt->duration;
621 
622  avist->packet_count++;
623 
624  // Make sure to put an OpenDML chunk when the file size exceeds the limits
625  if (pb->seekable &&
626  (avio_tell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
627  avi_write_ix(s);
628  ff_end_tag(pb, avi->movi_list);
629 
630  if (avi->riff_id == 1)
631  avi_write_idx1(s);
632 
633  ff_end_tag(pb, avi->riff_start);
634  avi->movi_list = avi_start_new_riff(s, pb, "AVIX", "movi");
635  }
636 
637  avi_stream2fourcc(tag, stream_index, enc->codec_type);
638  if (pkt->flags & AV_PKT_FLAG_KEY)
639  flags = 0x10;
640  if (enc->codec_type == AVMEDIA_TYPE_AUDIO)
641  avist->audio_strm_length += size;
642 
643  if (s->pb->seekable) {
644  AVIIndex *idx = &avist->indexes;
645  int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
646  int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
647  if (idx->ents_allocated <= idx->entry) {
648  idx->cluster = av_realloc_f(idx->cluster, sizeof(void*), cl+1);
649  if (!idx->cluster) {
650  idx->ents_allocated = 0;
651  idx->entry = 0;
652  return AVERROR(ENOMEM);
653  }
654  idx->cluster[cl] =
656  if (!idx->cluster[cl])
657  return AVERROR(ENOMEM);
659  }
660 
661  idx->cluster[cl][id].flags = flags;
662  idx->cluster[cl][id].pos = avio_tell(pb) - avi->movi_list;
663  idx->cluster[cl][id].len = size;
664  avist->max_size = FFMAX(avist->max_size, size);
665  idx->entry++;
666  }
667 
668  avio_write(pb, tag, 4);
669  avio_wl32(pb, size);
670  avio_write(pb, pkt->data, size);
671  if (size & 1)
672  avio_w8(pb, 0);
673 
674  return 0;
675 }
676 
678 {
679  AVIContext *avi = s->priv_data;
680  AVIOContext *pb = s->pb;
681  int res = 0;
682  int i, j, n, nb_frames;
683  int64_t file_size;
684 
685  for (i = 0; i < s->nb_streams; i++) {
686  AVIStream *avist = s->streams[i]->priv_data;
687  write_skip_frames(s, i, avist->last_dts);
688  }
689 
690  if (pb->seekable) {
691  if (avi->riff_id == 1) {
692  ff_end_tag(pb, avi->movi_list);
693  res = avi_write_idx1(s);
694  ff_end_tag(pb, avi->riff_start);
695  } else {
696  avi_write_ix(s);
697  ff_end_tag(pb, avi->movi_list);
698  ff_end_tag(pb, avi->riff_start);
699 
700  file_size = avio_tell(pb);
701  avio_seek(pb, avi->odml_list - 8, SEEK_SET);
702  ffio_wfourcc(pb, "LIST"); /* Making this AVI OpenDML one */
703  avio_skip(pb, 16);
704 
705  for (n = nb_frames = 0; n < s->nb_streams; n++) {
706  AVCodecContext *stream = s->streams[n]->codec;
707  AVIStream *avist = s->streams[n]->priv_data;
708 
709  if (stream->codec_type == AVMEDIA_TYPE_VIDEO) {
710  if (nb_frames < avist->packet_count)
711  nb_frames = avist->packet_count;
712  } else {
713  if (stream->codec_id == AV_CODEC_ID_MP2 ||
714  stream->codec_id == AV_CODEC_ID_MP3)
715  nb_frames += avist->packet_count;
716  }
717  }
718  avio_wl32(pb, nb_frames);
719  avio_seek(pb, file_size, SEEK_SET);
720 
721  avi_write_counters(s, avi->riff_id);
722  }
723  }
724 
725  for (i = 0; i < s->nb_streams; i++) {
726  AVIStream *avist = s->streams[i]->priv_data;
727  for (j = 0; j < avist->indexes.ents_allocated / AVI_INDEX_CLUSTER_SIZE; j++)
728  av_freep(&avist->indexes.cluster[j]);
729  av_freep(&avist->indexes.cluster);
730  avist->indexes.ents_allocated = avist->indexes.entry = 0;
731  if (pb->seekable) {
732  avio_seek(pb, avist->frames_hdr_strm + 4, SEEK_SET);
733  avio_wl32(pb, avist->max_size);
734  }
735  }
736 
737  return res;
738 }
739 
741  .name = "avi",
742  .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
743  .mime_type = "video/x-msvideo",
744  .extensions = "avi",
745  .priv_data_size = sizeof(AVIContext),
746  .audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_AC3,
747  .video_codec = AV_CODEC_ID_MPEG4,
751  .codec_tag = (const AVCodecTag * const []) {
753  },
754 };