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mux.c
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1 /*
2  * muxing functions for use within FFmpeg
3  * Copyright (c) 2000, 2001, 2002 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 "internal.h"
25 #include "libavcodec/internal.h"
26 #include "libavcodec/bytestream.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/pixdesc.h"
30 #include "libavutil/timestamp.h"
31 #include "metadata.h"
32 #include "id3v2.h"
33 #include "libavutil/avassert.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/mathematics.h"
36 #include "libavutil/parseutils.h"
37 #include "libavutil/time.h"
38 #include "riff.h"
39 #include "audiointerleave.h"
40 #include "url.h"
41 #include <stdarg.h>
42 #if CONFIG_NETWORK
43 #include "network.h"
44 #endif
45 
46 #undef NDEBUG
47 #include <assert.h>
48 
49 /**
50  * @file
51  * muxing functions for use within libavformat
52  */
53 
54 /* fraction handling */
55 
56 /**
57  * f = val + (num / den) + 0.5.
58  *
59  * 'num' is normalized so that it is such as 0 <= num < den.
60  *
61  * @param f fractional number
62  * @param val integer value
63  * @param num must be >= 0
64  * @param den must be >= 1
65  */
66 static void frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)
67 {
68  num += (den >> 1);
69  if (num >= den) {
70  val += num / den;
71  num = num % den;
72  }
73  f->val = val;
74  f->num = num;
75  f->den = den;
76 }
77 
78 /**
79  * Fractional addition to f: f = f + (incr / f->den).
80  *
81  * @param f fractional number
82  * @param incr increment, can be positive or negative
83  */
84 static void frac_add(AVFrac *f, int64_t incr)
85 {
86  int64_t num, den;
87 
88  num = f->num + incr;
89  den = f->den;
90  if (num < 0) {
91  f->val += num / den;
92  num = num % den;
93  if (num < 0) {
94  num += den;
95  f->val--;
96  }
97  } else if (num >= den) {
98  f->val += num / den;
99  num = num % den;
100  }
101  f->num = num;
102 }
103 
105 {
106  AVRational q;
107  int j;
108 
109  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
110  q = (AVRational){1, st->codec->sample_rate};
111  } else {
112  q = st->codec->time_base;
113  }
114  for (j=2; j<14; j+= 1+(j>2))
115  while (q.den / q.num < min_precission && q.num % j == 0)
116  q.num /= j;
117  while (q.den / q.num < min_precission && q.den < (1<<24))
118  q.den <<= 1;
119 
120  return q;
121 }
122 
124  const char *format, const char *filename)
125 {
127  int ret = 0;
128 
129  *avctx = NULL;
130  if (!s)
131  goto nomem;
132 
133  if (!oformat) {
134  if (format) {
135  oformat = av_guess_format(format, NULL, NULL);
136  if (!oformat) {
137  av_log(s, AV_LOG_ERROR, "Requested output format '%s' is not a suitable output format\n", format);
138  ret = AVERROR(EINVAL);
139  goto error;
140  }
141  } else {
142  oformat = av_guess_format(NULL, filename, NULL);
143  if (!oformat) {
144  ret = AVERROR(EINVAL);
145  av_log(s, AV_LOG_ERROR, "Unable to find a suitable output format for '%s'\n",
146  filename);
147  goto error;
148  }
149  }
150  }
151 
152  s->oformat = oformat;
153  if (s->oformat->priv_data_size > 0) {
155  if (!s->priv_data)
156  goto nomem;
157  if (s->oformat->priv_class) {
158  *(const AVClass**)s->priv_data= s->oformat->priv_class;
160  }
161  } else
162  s->priv_data = NULL;
163 
164  if (filename)
165  av_strlcpy(s->filename, filename, sizeof(s->filename));
166  *avctx = s;
167  return 0;
168 nomem:
169  av_log(s, AV_LOG_ERROR, "Out of memory\n");
170  ret = AVERROR(ENOMEM);
171 error:
173  return ret;
174 }
175 
176 #if FF_API_ALLOC_OUTPUT_CONTEXT
177 AVFormatContext *avformat_alloc_output_context(const char *format,
178  AVOutputFormat *oformat, const char *filename)
179 {
180  AVFormatContext *avctx;
181  int ret = avformat_alloc_output_context2(&avctx, oformat, format, filename);
182  return ret < 0 ? NULL : avctx;
183 }
184 #endif
185 
187 {
188  const AVCodecTag *avctag;
189  int n;
190  enum AVCodecID id = AV_CODEC_ID_NONE;
191  unsigned int tag = 0;
192 
193  /**
194  * Check that tag + id is in the table
195  * If neither is in the table -> OK
196  * If tag is in the table with another id -> FAIL
197  * If id is in the table with another tag -> FAIL unless strict < normal
198  */
199  for (n = 0; s->oformat->codec_tag[n]; n++) {
200  avctag = s->oformat->codec_tag[n];
201  while (avctag->id != AV_CODEC_ID_NONE) {
202  if (avpriv_toupper4(avctag->tag) == avpriv_toupper4(st->codec->codec_tag)) {
203  id = avctag->id;
204  if (id == st->codec->codec_id)
205  return 1;
206  }
207  if (avctag->id == st->codec->codec_id)
208  tag = avctag->tag;
209  avctag++;
210  }
211  }
212  if (id != AV_CODEC_ID_NONE)
213  return 0;
214  if (tag && (st->codec->strict_std_compliance >= FF_COMPLIANCE_NORMAL))
215  return 0;
216  return 1;
217 }
218 
219 
221 {
222  int ret = 0, i;
223  AVStream *st;
224  AVDictionary *tmp = NULL;
225  AVCodecContext *codec = NULL;
226  AVOutputFormat *of = s->oformat;
227 
228  if (options)
229  av_dict_copy(&tmp, *options, 0);
230 
231  if ((ret = av_opt_set_dict(s, &tmp)) < 0)
232  goto fail;
233  if (s->priv_data && s->oformat->priv_class && *(const AVClass**)s->priv_data==s->oformat->priv_class &&
234  (ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
235  goto fail;
236 
237  // some sanity checks
238  if (s->nb_streams == 0 && !(of->flags & AVFMT_NOSTREAMS)) {
239  av_log(s, AV_LOG_ERROR, "no streams\n");
240  ret = AVERROR(EINVAL);
241  goto fail;
242  }
243 
244  for (i = 0; i < s->nb_streams; i++) {
245  st = s->streams[i];
246  codec = st->codec;
247 
248  switch (codec->codec_type) {
249  case AVMEDIA_TYPE_AUDIO:
250  if (codec->sample_rate <= 0) {
251  av_log(s, AV_LOG_ERROR, "sample rate not set\n");
252  ret = AVERROR(EINVAL);
253  goto fail;
254  }
255  if (!codec->block_align)
256  codec->block_align = codec->channels *
257  av_get_bits_per_sample(codec->codec_id) >> 3;
258  break;
259  case AVMEDIA_TYPE_VIDEO:
260  if (codec->time_base.num <= 0 ||
261  codec->time_base.den <= 0) { //FIXME audio too?
262  av_log(s, AV_LOG_ERROR, "time base not set\n");
263  ret = AVERROR(EINVAL);
264  goto fail;
265  }
266 
267  if ((codec->width <= 0 || codec->height <= 0) &&
268  !(of->flags & AVFMT_NODIMENSIONS)) {
269  av_log(s, AV_LOG_ERROR, "dimensions not set\n");
270  ret = AVERROR(EINVAL);
271  goto fail;
272  }
275  ) {
276  if (st->sample_aspect_ratio.num != 0 &&
277  st->sample_aspect_ratio.den != 0 &&
278  codec->sample_aspect_ratio.den != 0 &&
279  codec->sample_aspect_ratio.den != 0) {
280  av_log(s, AV_LOG_ERROR, "Aspect ratio mismatch between muxer "
281  "(%d/%d) and encoder layer (%d/%d)\n",
283  codec->sample_aspect_ratio.num,
284  codec->sample_aspect_ratio.den);
285  ret = AVERROR(EINVAL);
286  goto fail;
287  }
288  }
289  break;
290  }
291 
292  if (of->codec_tag) {
293  if ( codec->codec_tag
294  && codec->codec_id == AV_CODEC_ID_RAWVIDEO
295  && ( av_codec_get_tag(of->codec_tag, codec->codec_id) == 0
296  || av_codec_get_tag(of->codec_tag, codec->codec_id) == MKTAG('r', 'a', 'w', ' '))
297  && !validate_codec_tag(s, st)) {
298  // the current rawvideo encoding system ends up setting
299  // the wrong codec_tag for avi/mov, we override it here
300  codec->codec_tag = 0;
301  }
302  if (codec->codec_tag) {
303  if (!validate_codec_tag(s, st)) {
304  char tagbuf[32], tagbuf2[32];
305  av_get_codec_tag_string(tagbuf, sizeof(tagbuf), codec->codec_tag);
306  av_get_codec_tag_string(tagbuf2, sizeof(tagbuf2), av_codec_get_tag(s->oformat->codec_tag, codec->codec_id));
307  av_log(s, AV_LOG_ERROR,
308  "Tag %s/0x%08x incompatible with output codec id '%d' (%s)\n",
309  tagbuf, codec->codec_tag, codec->codec_id, tagbuf2);
310  ret = AVERROR_INVALIDDATA;
311  goto fail;
312  }
313  } else
314  codec->codec_tag = av_codec_get_tag(of->codec_tag, codec->codec_id);
315  }
316 
317  if (of->flags & AVFMT_GLOBALHEADER &&
318  !(codec->flags & CODEC_FLAG_GLOBAL_HEADER))
320  "Codec for stream %d does not use global headers "
321  "but container format requires global headers\n", i);
322  }
323 
324  if (!s->priv_data && of->priv_data_size > 0) {
326  if (!s->priv_data) {
327  ret = AVERROR(ENOMEM);
328  goto fail;
329  }
330  if (of->priv_class) {
331  *(const AVClass **)s->priv_data = of->priv_class;
333  if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
334  goto fail;
335  }
336  }
337 
338  /* set muxer identification string */
339  if (s->nb_streams && !(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
340  av_dict_set(&s->metadata, "encoder", LIBAVFORMAT_IDENT, 0);
341  }
342 
343  if (options) {
344  av_dict_free(options);
345  *options = tmp;
346  }
347 
348  return 0;
349 
350 fail:
351  av_dict_free(&tmp);
352  return ret;
353 }
354 
356 {
357  int i;
358  AVStream *st;
359 
360  /* init PTS generation */
361  for (i = 0; i < s->nb_streams; i++) {
362  int64_t den = AV_NOPTS_VALUE;
363  st = s->streams[i];
364 
365  switch (st->codec->codec_type) {
366  case AVMEDIA_TYPE_AUDIO:
367  den = (int64_t)st->time_base.num * st->codec->sample_rate;
368  break;
369  case AVMEDIA_TYPE_VIDEO:
370  den = (int64_t)st->time_base.num * st->codec->time_base.den;
371  break;
372  default:
373  break;
374  }
375  if (den != AV_NOPTS_VALUE) {
376  if (den <= 0)
377  return AVERROR_INVALIDDATA;
378 
379  frac_init(&st->pts, 0, 0, den);
380  }
381  }
382 
383  return 0;
384 }
385 
387 {
388  int ret = 0;
389 
390  if (ret = init_muxer(s, options))
391  return ret;
392 
393  if (s->oformat->write_header) {
394  ret = s->oformat->write_header(s);
395  if (ret >= 0 && s->pb && s->pb->error < 0)
396  ret = s->pb->error;
397  if (ret < 0)
398  return ret;
399  }
400 
401  if ((ret = init_pts(s)) < 0)
402  return ret;
403 
404  if (s->avoid_negative_ts < 0) {
406  s->avoid_negative_ts = 0;
407  } else
408  s->avoid_negative_ts = 1;
409  }
410 
411  return 0;
412 }
413 
414 //FIXME merge with compute_pkt_fields
416 {
417  int delay = FFMAX(st->codec->has_b_frames, st->codec->max_b_frames > 0);
418  int num, den, frame_size, i;
419 
420  av_dlog(s, "compute_pkt_fields2: pts:%s dts:%s cur_dts:%s b:%d size:%d st:%d\n",
421  av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts), delay, pkt->size, pkt->stream_index);
422 
423  /* duration field */
424  if (pkt->duration == 0) {
425  ff_compute_frame_duration(&num, &den, st, NULL, pkt);
426  if (den && num) {
427  pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den * st->codec->ticks_per_frame, den * (int64_t)st->time_base.num);
428  }
429  }
430 
431  if (pkt->pts == AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE && delay == 0)
432  pkt->pts = pkt->dts;
433 
434  //XXX/FIXME this is a temporary hack until all encoders output pts
435  if ((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !delay) {
436  static int warned;
437  if (!warned) {
438  av_log(s, AV_LOG_WARNING, "Encoder did not produce proper pts, making some up.\n");
439  warned = 1;
440  }
441  pkt->dts =
442 // pkt->pts= st->cur_dts;
443  pkt->pts = st->pts.val;
444  }
445 
446  //calculate dts from pts
447  if (pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
448  st->pts_buffer[0] = pkt->pts;
449  for (i = 1; i < delay + 1 && st->pts_buffer[i] == AV_NOPTS_VALUE; i++)
450  st->pts_buffer[i] = pkt->pts + (i - delay - 1) * pkt->duration;
451  for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
452  FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
453 
454  pkt->dts = st->pts_buffer[0];
455  }
456 
457  if (st->cur_dts && st->cur_dts != AV_NOPTS_VALUE &&
458  ((!(s->oformat->flags & AVFMT_TS_NONSTRICT) &&
459  st->cur_dts >= pkt->dts) || st->cur_dts > pkt->dts)) {
460  av_log(s, AV_LOG_ERROR,
461  "Application provided invalid, non monotonically increasing dts to muxer in stream %d: %s >= %s\n",
462  st->index, av_ts2str(st->cur_dts), av_ts2str(pkt->dts));
463  return AVERROR(EINVAL);
464  }
465  if (pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts) {
466  av_log(s, AV_LOG_ERROR, "pts (%s) < dts (%s) in stream %d\n",
467  av_ts2str(pkt->pts), av_ts2str(pkt->dts), st->index);
468  return AVERROR(EINVAL);
469  }
470 
471  av_dlog(s, "av_write_frame: pts2:%s dts2:%s\n",
472  av_ts2str(pkt->pts), av_ts2str(pkt->dts));
473  st->cur_dts = pkt->dts;
474  st->pts.val = pkt->dts;
475 
476  /* update pts */
477  switch (st->codec->codec_type) {
478  case AVMEDIA_TYPE_AUDIO:
479  frame_size = ff_get_audio_frame_size(st->codec, pkt->size, 1);
480 
481  /* HACK/FIXME, we skip the initial 0 size packets as they are most
482  * likely equal to the encoder delay, but it would be better if we
483  * had the real timestamps from the encoder */
484  if (frame_size >= 0 && (pkt->size || st->pts.num != st->pts.den >> 1 || st->pts.val)) {
485  frac_add(&st->pts, (int64_t)st->time_base.den * frame_size);
486  }
487  break;
488  case AVMEDIA_TYPE_VIDEO:
489  frac_add(&st->pts, (int64_t)st->time_base.den * st->codec->time_base.num);
490  break;
491  default:
492  break;
493  }
494  return 0;
495 }
496 
497 /**
498  * Make timestamps non negative, move side data from payload to internal struct, call muxer, and restore
499  * sidedata.
500  *
501  * FIXME: this function should NEVER get undefined pts/dts beside when the
502  * AVFMT_NOTIMESTAMPS is set.
503  * Those additional safety checks should be dropped once the correct checks
504  * are set in the callers.
505  */
507 {
508  int ret, did_split;
509 
510  if (s->avoid_negative_ts > 0) {
511  AVStream *st = s->streams[pkt->stream_index];
512  int64_t offset = st->mux_ts_offset;
513 
514  if (pkt->dts < 0 && pkt->dts != AV_NOPTS_VALUE && !s->offset) {
515  s->offset = -pkt->dts;
516  s->offset_timebase = st->time_base;
517  }
518 
519  if (s->offset && !offset) {
520  offset = st->mux_ts_offset =
522  s->offset_timebase,
523  st->time_base,
524  AV_ROUND_UP);
525  }
526 
527  if (pkt->dts != AV_NOPTS_VALUE)
528  pkt->dts += offset;
529  if (pkt->pts != AV_NOPTS_VALUE)
530  pkt->pts += offset;
531 
532  av_assert2(pkt->dts == AV_NOPTS_VALUE || pkt->dts >= 0);
533  }
534 
535  did_split = av_packet_split_side_data(pkt);
536  ret = s->oformat->write_packet(s, pkt);
537  if (s->flush_packets && s->pb && s->pb->error >= 0)
538  avio_flush(s->pb);
539  if (did_split)
541  return ret;
542 }
543 
545 {
546  int ret;
547 
548  if (!pkt) {
549  if (s->oformat->flags & AVFMT_ALLOW_FLUSH) {
550  ret = s->oformat->write_packet(s, NULL);
551  if (s->flush_packets && s->pb && s->pb->error >= 0)
552  avio_flush(s->pb);
553  if (ret >= 0 && s->pb && s->pb->error < 0)
554  ret = s->pb->error;
555  return ret;
556  }
557  return 1;
558  }
559 
560  ret = compute_pkt_fields2(s, s->streams[pkt->stream_index], pkt);
561 
562  if (ret < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
563  return ret;
564 
565  ret = write_packet(s, pkt);
566  if (ret >= 0 && s->pb && s->pb->error < 0)
567  ret = s->pb->error;
568 
569  if (ret >= 0)
570  s->streams[pkt->stream_index]->nb_frames++;
571  return ret;
572 }
573 
574 #define CHUNK_START 0x1000
575 
577  int (*compare)(AVFormatContext *, AVPacket *, AVPacket *))
578 {
579  AVPacketList **next_point, *this_pktl;
580  AVStream *st = s->streams[pkt->stream_index];
581  int chunked = s->max_chunk_size || s->max_chunk_duration;
582 
583  this_pktl = av_mallocz(sizeof(AVPacketList));
584  if (!this_pktl)
585  return AVERROR(ENOMEM);
586  this_pktl->pkt = *pkt;
587 #if FF_API_DESTRUCT_PACKET
588  pkt->destruct = NULL; // do not free original but only the copy
589 #endif
590  pkt->buf = NULL;
591  av_dup_packet(&this_pktl->pkt); // duplicate the packet if it uses non-allocated memory
592  av_copy_packet_side_data(&this_pktl->pkt, &this_pktl->pkt); // copy side data
593 
595  next_point = &(st->last_in_packet_buffer->next);
596  } else {
597  next_point = &s->packet_buffer;
598  }
599 
600  if (chunked) {
602  st->interleaver_chunk_size += pkt->size;
605  || (max && st->interleaver_chunk_duration > max)) {
606  st->interleaver_chunk_size = 0;
607  this_pktl->pkt.flags |= CHUNK_START;
608  if (max && st->interleaver_chunk_duration > max) {
609  int64_t syncoffset = (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)*max/2;
610  int64_t syncto = av_rescale(pkt->dts + syncoffset, 1, max)*max - syncoffset;
611 
612  st->interleaver_chunk_duration += (pkt->dts - syncto)/8 - max;
613  } else
615  }
616  }
617  if (*next_point) {
618  if (chunked && !(this_pktl->pkt.flags & CHUNK_START))
619  goto next_non_null;
620 
621  if (compare(s, &s->packet_buffer_end->pkt, pkt)) {
622  while ( *next_point
623  && ((chunked && !((*next_point)->pkt.flags&CHUNK_START))
624  || !compare(s, &(*next_point)->pkt, pkt)))
625  next_point = &(*next_point)->next;
626  if (*next_point)
627  goto next_non_null;
628  } else {
629  next_point = &(s->packet_buffer_end->next);
630  }
631  }
632  av_assert1(!*next_point);
633 
634  s->packet_buffer_end = this_pktl;
635 next_non_null:
636 
637  this_pktl->next = *next_point;
638 
640  *next_point = this_pktl;
641  return 0;
642 }
643 
645  AVPacket *pkt)
646 {
647  AVStream *st = s->streams[pkt->stream_index];
648  AVStream *st2 = s->streams[next->stream_index];
649  int comp = av_compare_ts(next->dts, st2->time_base, pkt->dts,
650  st->time_base);
652  int64_t ts = av_rescale_q(pkt ->dts, st ->time_base, AV_TIME_BASE_Q) - s->audio_preload*(st ->codec->codec_type == AVMEDIA_TYPE_AUDIO);
653  int64_t ts2= av_rescale_q(next->dts, st2->time_base, AV_TIME_BASE_Q) - s->audio_preload*(st2->codec->codec_type == AVMEDIA_TYPE_AUDIO);
654  if (ts == ts2) {
655  ts= ( pkt ->dts* st->time_base.num*AV_TIME_BASE - s->audio_preload*(int64_t)(st ->codec->codec_type == AVMEDIA_TYPE_AUDIO)* st->time_base.den)*st2->time_base.den
656  -( next->dts*st2->time_base.num*AV_TIME_BASE - s->audio_preload*(int64_t)(st2->codec->codec_type == AVMEDIA_TYPE_AUDIO)*st2->time_base.den)* st->time_base.den;
657  ts2=0;
658  }
659  comp= (ts>ts2) - (ts<ts2);
660  }
661 
662  if (comp == 0)
663  return pkt->stream_index < next->stream_index;
664  return comp > 0;
665 }
666 
668  AVPacket *pkt, int flush)
669 {
670  AVPacketList *pktl;
671  int stream_count = 0, noninterleaved_count = 0;
672  int64_t delta_dts_max = 0;
673  int i, ret;
674 
675  if (pkt) {
677  if (ret < 0)
678  return ret;
679  }
680 
681  for (i = 0; i < s->nb_streams; i++) {
682  if (s->streams[i]->last_in_packet_buffer) {
683  ++stream_count;
684  } else if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
685  ++noninterleaved_count;
686  }
687  }
688 
689  if (s->nb_streams == stream_count) {
690  flush = 1;
691  } else if (!flush) {
692  for (i=0; i < s->nb_streams; i++) {
693  if (s->streams[i]->last_in_packet_buffer) {
694  int64_t delta_dts =
696  s->streams[i]->time_base,
697  AV_TIME_BASE_Q) -
701  delta_dts_max= FFMAX(delta_dts_max, delta_dts);
702  }
703  }
704  if (s->nb_streams == stream_count+noninterleaved_count &&
705  delta_dts_max > 20*AV_TIME_BASE) {
706  av_log(s, AV_LOG_DEBUG, "flushing with %d noninterleaved\n", noninterleaved_count);
707  flush = 1;
708  }
709  }
710  if (stream_count && flush) {
711  AVStream *st;
712  pktl = s->packet_buffer;
713  *out = pktl->pkt;
714  st = s->streams[out->stream_index];
715 
716  s->packet_buffer = pktl->next;
717  if (!s->packet_buffer)
718  s->packet_buffer_end = NULL;
719 
720  if (st->last_in_packet_buffer == pktl)
721  st->last_in_packet_buffer = NULL;
722  av_freep(&pktl);
723 
724  return 1;
725  } else {
726  av_init_packet(out);
727  return 0;
728  }
729 }
730 
731 /**
732  * Interleave an AVPacket correctly so it can be muxed.
733  * @param out the interleaved packet will be output here
734  * @param in the input packet
735  * @param flush 1 if no further packets are available as input and all
736  * remaining packets should be output
737  * @return 1 if a packet was output, 0 if no packet could be output,
738  * < 0 if an error occurred
739  */
741 {
742  if (s->oformat->interleave_packet) {
743  int ret = s->oformat->interleave_packet(s, out, in, flush);
744  if (in)
745  av_free_packet(in);
746  return ret;
747  } else
748  return ff_interleave_packet_per_dts(s, out, in, flush);
749 }
750 
752 {
753  int ret, flush = 0;
754 
755  if (pkt) {
756  AVStream *st = s->streams[pkt->stream_index];
757 
758  //FIXME/XXX/HACK drop zero sized packets
759  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && pkt->size == 0)
760  return 0;
761 
762  av_dlog(s, "av_interleaved_write_frame size:%d dts:%s pts:%s\n",
763  pkt->size, av_ts2str(pkt->dts), av_ts2str(pkt->pts));
764  if ((ret = compute_pkt_fields2(s, st, pkt)) < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
765  return ret;
766 
767  if (pkt->dts == AV_NOPTS_VALUE && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
768  return AVERROR(EINVAL);
769  } else {
770  av_dlog(s, "av_interleaved_write_frame FLUSH\n");
771  flush = 1;
772  }
773 
774  for (;; ) {
775  AVPacket opkt;
776  int ret = interleave_packet(s, &opkt, pkt, flush);
777  if (ret <= 0) //FIXME cleanup needed for ret<0 ?
778  return ret;
779 
780  ret = write_packet(s, &opkt);
781  if (ret >= 0)
782  s->streams[opkt.stream_index]->nb_frames++;
783 
784  av_free_packet(&opkt);
785  pkt = NULL;
786 
787  if (ret < 0)
788  return ret;
789  if(s->pb && s->pb->error)
790  return s->pb->error;
791  }
792 }
793 
795 {
796  int ret, i;
797 
798  for (;; ) {
799  AVPacket pkt;
800  ret = interleave_packet(s, &pkt, NULL, 1);
801  if (ret < 0) //FIXME cleanup needed for ret<0 ?
802  goto fail;
803  if (!ret)
804  break;
805 
806  ret = write_packet(s, &pkt);
807  if (ret >= 0)
808  s->streams[pkt.stream_index]->nb_frames++;
809 
810  av_free_packet(&pkt);
811 
812  if (ret < 0)
813  goto fail;
814  if(s->pb && s->pb->error)
815  goto fail;
816  }
817 
818  if (s->oformat->write_trailer)
819  ret = s->oformat->write_trailer(s);
820 
821 fail:
822  if (s->pb)
823  avio_flush(s->pb);
824  if (ret == 0)
825  ret = s->pb ? s->pb->error : 0;
826  for (i = 0; i < s->nb_streams; i++) {
827  av_freep(&s->streams[i]->priv_data);
828  av_freep(&s->streams[i]->index_entries);
829  }
830  if (s->oformat->priv_class)
832  av_freep(&s->priv_data);
833  return ret;
834 }
835 
836 int av_get_output_timestamp(struct AVFormatContext *s, int stream,
837  int64_t *dts, int64_t *wall)
838 {
839  if (!s->oformat || !s->oformat->get_output_timestamp)
840  return AVERROR(ENOSYS);
841  s->oformat->get_output_timestamp(s, stream, dts, wall);
842  return 0;
843 }
844 
845 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
847 {
848  AVPacket local_pkt;
849 
850  local_pkt = *pkt;
851  local_pkt.stream_index = dst_stream;
852  if (pkt->pts != AV_NOPTS_VALUE)
853  local_pkt.pts = av_rescale_q(pkt->pts,
854  src->streams[pkt->stream_index]->time_base,
855  dst->streams[dst_stream]->time_base);
856  if (pkt->dts != AV_NOPTS_VALUE)
857  local_pkt.dts = av_rescale_q(pkt->dts,
858  src->streams[pkt->stream_index]->time_base,
859  dst->streams[dst_stream]->time_base);
860  if (pkt->duration)
861  local_pkt.duration = av_rescale_q(pkt->duration,
862  src->streams[pkt->stream_index]->time_base,
863  dst->streams[dst_stream]->time_base);
864  return av_write_frame(dst, &local_pkt);
865 }