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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 /* #define DEBUG */
23 
24 #include "avformat.h"
25 #include "avio_internal.h"
26 #include "internal.h"
27 #include "libavcodec/internal.h"
28 #include "libavcodec/bytestream.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/dict.h"
31 #include "libavutil/pixdesc.h"
32 #include "libavutil/timestamp.h"
33 #include "metadata.h"
34 #include "id3v2.h"
35 #include "libavutil/avassert.h"
36 #include "libavutil/avstring.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/parseutils.h"
39 #include "libavutil/time.h"
40 #include "riff.h"
41 #include "audiointerleave.h"
42 #include "url.h"
43 #include <stdarg.h>
44 #if CONFIG_NETWORK
45 #include "network.h"
46 #endif
47 
48 #undef NDEBUG
49 #include <assert.h>
50 
51 /**
52  * @file
53  * muxing functions for use within libavformat
54  */
55 
56 /* fraction handling */
57 
58 /**
59  * f = val + (num / den) + 0.5.
60  *
61  * 'num' is normalized so that it is such as 0 <= num < den.
62  *
63  * @param f fractional number
64  * @param val integer value
65  * @param num must be >= 0
66  * @param den must be >= 1
67  */
68 static void frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)
69 {
70  num += (den >> 1);
71  if (num >= den) {
72  val += num / den;
73  num = num % den;
74  }
75  f->val = val;
76  f->num = num;
77  f->den = den;
78 }
79 
80 /**
81  * Fractional addition to f: f = f + (incr / f->den).
82  *
83  * @param f fractional number
84  * @param incr increment, can be positive or negative
85  */
86 static void frac_add(AVFrac *f, int64_t incr)
87 {
88  int64_t num, den;
89 
90  num = f->num + incr;
91  den = f->den;
92  if (num < 0) {
93  f->val += num / den;
94  num = num % den;
95  if (num < 0) {
96  num += den;
97  f->val--;
98  }
99  } else if (num >= den) {
100  f->val += num / den;
101  num = num % den;
102  }
103  f->num = num;
104 }
105 
107 {
108  AVRational q;
109  int j;
110 
111  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
112  q = (AVRational){1, st->codec->sample_rate};
113  } else {
114  q = st->codec->time_base;
115  }
116  for (j=2; j<14; j+= 1+(j>2))
117  while (q.den / q.num < min_precission && q.num % j == 0)
118  q.num /= j;
119  while (q.den / q.num < min_precission && q.den < (1<<24))
120  q.den <<= 1;
121 
122  return q;
123 }
124 
126  const char *format, const char *filename)
127 {
129  int ret = 0;
130 
131  *avctx = NULL;
132  if (!s)
133  goto nomem;
134 
135  if (!oformat) {
136  if (format) {
137  oformat = av_guess_format(format, NULL, NULL);
138  if (!oformat) {
139  av_log(s, AV_LOG_ERROR, "Requested output format '%s' is not a suitable output format\n", format);
140  ret = AVERROR(EINVAL);
141  goto error;
142  }
143  } else {
144  oformat = av_guess_format(NULL, filename, NULL);
145  if (!oformat) {
146  ret = AVERROR(EINVAL);
147  av_log(s, AV_LOG_ERROR, "Unable to find a suitable output format for '%s'\n",
148  filename);
149  goto error;
150  }
151  }
152  }
153 
154  s->oformat = oformat;
155  if (s->oformat->priv_data_size > 0) {
157  if (!s->priv_data)
158  goto nomem;
159  if (s->oformat->priv_class) {
160  *(const AVClass**)s->priv_data= s->oformat->priv_class;
162  }
163  } else
164  s->priv_data = NULL;
165 
166  if (filename)
167  av_strlcpy(s->filename, filename, sizeof(s->filename));
168  *avctx = s;
169  return 0;
170 nomem:
171  av_log(s, AV_LOG_ERROR, "Out of memory\n");
172  ret = AVERROR(ENOMEM);
173 error:
175  return ret;
176 }
177 
178 #if FF_API_ALLOC_OUTPUT_CONTEXT
179 AVFormatContext *avformat_alloc_output_context(const char *format,
180  AVOutputFormat *oformat, const char *filename)
181 {
182  AVFormatContext *avctx;
183  int ret = avformat_alloc_output_context2(&avctx, oformat, format, filename);
184  return ret < 0 ? NULL : avctx;
185 }
186 #endif
187 
189 {
190  const AVCodecTag *avctag;
191  int n;
192  enum AVCodecID id = AV_CODEC_ID_NONE;
193  unsigned int tag = 0;
194 
195  /**
196  * Check that tag + id is in the table
197  * If neither is in the table -> OK
198  * If tag is in the table with another id -> FAIL
199  * If id is in the table with another tag -> FAIL unless strict < normal
200  */
201  for (n = 0; s->oformat->codec_tag[n]; n++) {
202  avctag = s->oformat->codec_tag[n];
203  while (avctag->id != AV_CODEC_ID_NONE) {
204  if (avpriv_toupper4(avctag->tag) == avpriv_toupper4(st->codec->codec_tag)) {
205  id = avctag->id;
206  if (id == st->codec->codec_id)
207  return 1;
208  }
209  if (avctag->id == st->codec->codec_id)
210  tag = avctag->tag;
211  avctag++;
212  }
213  }
214  if (id != AV_CODEC_ID_NONE)
215  return 0;
216  if (tag && (st->codec->strict_std_compliance >= FF_COMPLIANCE_NORMAL))
217  return 0;
218  return 1;
219 }
220 
221 
223 {
224  int ret = 0, i;
225  AVStream *st;
226  AVDictionary *tmp = NULL;
227  AVCodecContext *codec = NULL;
228  AVOutputFormat *of = s->oformat;
229 
230  if (options)
231  av_dict_copy(&tmp, *options, 0);
232 
233  if ((ret = av_opt_set_dict(s, &tmp)) < 0)
234  goto fail;
235  if (s->priv_data && s->oformat->priv_class && *(const AVClass**)s->priv_data==s->oformat->priv_class &&
236  (ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
237  goto fail;
238 
239  // some sanity checks
240  if (s->nb_streams == 0 && !(of->flags & AVFMT_NOSTREAMS)) {
241  av_log(s, AV_LOG_ERROR, "no streams\n");
242  ret = AVERROR(EINVAL);
243  goto fail;
244  }
245 
246  for (i = 0; i < s->nb_streams; i++) {
247  st = s->streams[i];
248  codec = st->codec;
249 
250  switch (codec->codec_type) {
251  case AVMEDIA_TYPE_AUDIO:
252  if (codec->sample_rate <= 0) {
253  av_log(s, AV_LOG_ERROR, "sample rate not set\n");
254  ret = AVERROR(EINVAL);
255  goto fail;
256  }
257  if (!codec->block_align)
258  codec->block_align = codec->channels *
259  av_get_bits_per_sample(codec->codec_id) >> 3;
260  break;
261  case AVMEDIA_TYPE_VIDEO:
262  if (codec->time_base.num <= 0 ||
263  codec->time_base.den <= 0) { //FIXME audio too?
264  av_log(s, AV_LOG_ERROR, "time base not set\n");
265  ret = AVERROR(EINVAL);
266  goto fail;
267  }
268 
269  if ((codec->width <= 0 || codec->height <= 0) &&
270  !(of->flags & AVFMT_NODIMENSIONS)) {
271  av_log(s, AV_LOG_ERROR, "dimensions not set\n");
272  ret = AVERROR(EINVAL);
273  goto fail;
274  }
277  ) {
278  av_log(s, AV_LOG_ERROR, "Aspect ratio mismatch between muxer "
279  "(%d/%d) and encoder layer (%d/%d)\n",
281  codec->sample_aspect_ratio.num,
282  codec->sample_aspect_ratio.den);
283  ret = AVERROR(EINVAL);
284  goto fail;
285  }
286  break;
287  }
288 
289  if (of->codec_tag) {
290  if ( codec->codec_tag
291  && codec->codec_id == AV_CODEC_ID_RAWVIDEO
292  && ( av_codec_get_tag(of->codec_tag, codec->codec_id) == 0
293  || av_codec_get_tag(of->codec_tag, codec->codec_id) == MKTAG('r', 'a', 'w', ' '))
294  && !validate_codec_tag(s, st)) {
295  // the current rawvideo encoding system ends up setting
296  // the wrong codec_tag for avi/mov, we override it here
297  codec->codec_tag = 0;
298  }
299  if (codec->codec_tag) {
300  if (!validate_codec_tag(s, st)) {
301  char tagbuf[32], cortag[32];
302  av_get_codec_tag_string(tagbuf, sizeof(tagbuf), codec->codec_tag);
303  av_get_codec_tag_string(cortag, sizeof(cortag), av_codec_get_tag(s->oformat->codec_tag, codec->codec_id));
304  av_log(s, AV_LOG_ERROR,
305  "Tag %s/0x%08x incompatible with output codec id '%d' (%s)\n",
306  tagbuf, codec->codec_tag, codec->codec_id, cortag);
307  ret = AVERROR_INVALIDDATA;
308  goto fail;
309  }
310  } else
311  codec->codec_tag = av_codec_get_tag(of->codec_tag, codec->codec_id);
312  }
313 
314  if (of->flags & AVFMT_GLOBALHEADER &&
315  !(codec->flags & CODEC_FLAG_GLOBAL_HEADER))
317  "Codec for stream %d does not use global headers "
318  "but container format requires global headers\n", i);
319  }
320 
321  if (!s->priv_data && of->priv_data_size > 0) {
323  if (!s->priv_data) {
324  ret = AVERROR(ENOMEM);
325  goto fail;
326  }
327  if (of->priv_class) {
328  *(const AVClass **)s->priv_data = of->priv_class;
330  if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
331  goto fail;
332  }
333  }
334 
335  /* set muxer identification string */
336  if (s->nb_streams && !(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
337  av_dict_set(&s->metadata, "encoder", LIBAVFORMAT_IDENT, 0);
338  }
339 
340  if (options) {
341  av_dict_free(options);
342  *options = tmp;
343  }
344 
345  return 0;
346 
347 fail:
348  av_dict_free(&tmp);
349  return ret;
350 }
351 
352 static int init_pts(AVFormatContext *s)
353 {
354  int i;
355  AVStream *st;
356 
357  /* init PTS generation */
358  for (i = 0; i < s->nb_streams; i++) {
359  int64_t den = AV_NOPTS_VALUE;
360  st = s->streams[i];
361 
362  switch (st->codec->codec_type) {
363  case AVMEDIA_TYPE_AUDIO:
364  den = (int64_t)st->time_base.num * st->codec->sample_rate;
365  break;
366  case AVMEDIA_TYPE_VIDEO:
367  den = (int64_t)st->time_base.num * st->codec->time_base.den;
368  break;
369  default:
370  break;
371  }
372  if (den != AV_NOPTS_VALUE) {
373  if (den <= 0)
374  return AVERROR_INVALIDDATA;
375 
376  frac_init(&st->pts, 0, 0, den);
377  }
378  }
379 
380  return 0;
381 }
382 
384 {
385  int ret = 0;
386 
387  if (ret = init_muxer(s, options))
388  return ret;
389 
390  if (s->oformat->write_header) {
391  ret = s->oformat->write_header(s);
392  if (ret >= 0 && s->pb && s->pb->error < 0)
393  ret = s->pb->error;
394  if (ret < 0)
395  return ret;
396  }
397 
398  if ((ret = init_pts(s)) < 0)
399  return ret;
400 
401  return 0;
402 }
403 
404 //FIXME merge with compute_pkt_fields
406 {
407  int delay = FFMAX(st->codec->has_b_frames, st->codec->max_b_frames > 0);
408  int num, den, frame_size, i;
409 
410  av_dlog(s, "compute_pkt_fields2: pts:%s dts:%s cur_dts:%s b:%d size:%d st:%d\n",
411  av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts), delay, pkt->size, pkt->stream_index);
412 
413  /* duration field */
414  if (pkt->duration == 0) {
415  ff_compute_frame_duration(&num, &den, st, NULL, pkt);
416  if (den && num) {
417  pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den * st->codec->ticks_per_frame, den * (int64_t)st->time_base.num);
418  }
419  }
420 
421  if (pkt->pts == AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE && delay == 0)
422  pkt->pts = pkt->dts;
423 
424  //XXX/FIXME this is a temporary hack until all encoders output pts
425  if ((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !delay) {
426  static int warned;
427  if (!warned) {
428  av_log(s, AV_LOG_WARNING, "Encoder did not produce proper pts, making some up.\n");
429  warned = 1;
430  }
431  pkt->dts =
432 // pkt->pts= st->cur_dts;
433  pkt->pts = st->pts.val;
434  }
435 
436  //calculate dts from pts
437  if (pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
438  st->pts_buffer[0] = pkt->pts;
439  for (i = 1; i < delay + 1 && st->pts_buffer[i] == AV_NOPTS_VALUE; i++)
440  st->pts_buffer[i] = pkt->pts + (i - delay - 1) * pkt->duration;
441  for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
442  FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
443 
444  pkt->dts = st->pts_buffer[0];
445  }
446 
447  if (st->cur_dts && st->cur_dts != AV_NOPTS_VALUE &&
448  ((!(s->oformat->flags & AVFMT_TS_NONSTRICT) &&
449  st->cur_dts >= pkt->dts) || st->cur_dts > pkt->dts)) {
450  av_log(s, AV_LOG_ERROR,
451  "Application provided invalid, non monotonically increasing dts to muxer in stream %d: %s >= %s\n",
452  st->index, av_ts2str(st->cur_dts), av_ts2str(pkt->dts));
453  return AVERROR(EINVAL);
454  }
455  if (pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts) {
456  av_log(s, AV_LOG_ERROR, "pts (%s) < dts (%s) in stream %d\n",
457  av_ts2str(pkt->pts), av_ts2str(pkt->dts), st->index);
458  return AVERROR(EINVAL);
459  }
460 
461  av_dlog(s, "av_write_frame: pts2:%s dts2:%s\n",
462  av_ts2str(pkt->pts), av_ts2str(pkt->dts));
463  st->cur_dts = pkt->dts;
464  st->pts.val = pkt->dts;
465 
466  /* update pts */
467  switch (st->codec->codec_type) {
468  case AVMEDIA_TYPE_AUDIO:
469  frame_size = ff_get_audio_frame_size(st->codec, pkt->size, 1);
470 
471  /* HACK/FIXME, we skip the initial 0 size packets as they are most
472  * likely equal to the encoder delay, but it would be better if we
473  * had the real timestamps from the encoder */
474  if (frame_size >= 0 && (pkt->size || st->pts.num != st->pts.den >> 1 || st->pts.val)) {
475  frac_add(&st->pts, (int64_t)st->time_base.den * frame_size);
476  }
477  break;
478  case AVMEDIA_TYPE_VIDEO:
479  frac_add(&st->pts, (int64_t)st->time_base.den * st->codec->time_base.num);
480  break;
481  default:
482  break;
483  }
484  return 0;
485 }
486 
487 /**
488  * Move side data from payload to internal struct, call muxer, and restore
489  * original packet.
490  */
492 {
493  int ret, did_split;
494 
495  did_split = av_packet_split_side_data(pkt);
496  ret = s->oformat->write_packet(s, pkt);
497  if (did_split)
499  return ret;
500 }
501 
503 {
504  int ret;
505 
506  if (!pkt) {
507  if (s->oformat->flags & AVFMT_ALLOW_FLUSH) {
508  ret = s->oformat->write_packet(s, NULL);
509  if (ret >= 0 && s->pb && s->pb->error < 0)
510  ret = s->pb->error;
511  return ret;
512  }
513  return 1;
514  }
515 
516  ret = compute_pkt_fields2(s, s->streams[pkt->stream_index], pkt);
517 
518  if (ret < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
519  return ret;
520 
521  ret = split_write_packet(s, pkt);
522  if (ret >= 0 && s->pb && s->pb->error < 0)
523  ret = s->pb->error;
524 
525  if (ret >= 0)
526  s->streams[pkt->stream_index]->nb_frames++;
527  return ret;
528 }
529 
530 #define CHUNK_START 0x1000
531 
533  int (*compare)(AVFormatContext *, AVPacket *, AVPacket *))
534 {
535  AVPacketList **next_point, *this_pktl;
536  AVStream *st = s->streams[pkt->stream_index];
537  int chunked = s->max_chunk_size || s->max_chunk_duration;
538 
539  this_pktl = av_mallocz(sizeof(AVPacketList));
540  if (!this_pktl)
541  return AVERROR(ENOMEM);
542  this_pktl->pkt = *pkt;
543  pkt->destruct = NULL; // do not free original but only the copy
544  av_dup_packet(&this_pktl->pkt); // duplicate the packet if it uses non-allocated memory
545 
547  next_point = &(st->last_in_packet_buffer->next);
548  } else {
549  next_point = &s->packet_buffer;
550  }
551 
552  if (chunked) {
554  st->interleaver_chunk_size += pkt->size;
557  || (max && st->interleaver_chunk_duration > max)) {
558  st->interleaver_chunk_size = 0;
559  this_pktl->pkt.flags |= CHUNK_START;
560  if (max && st->interleaver_chunk_duration > max) {
561  int64_t syncoffset = (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)*max/2;
562  int64_t syncto = av_rescale(pkt->dts + syncoffset, 1, max)*max - syncoffset;
563 
564  st->interleaver_chunk_duration += (pkt->dts - syncto)/8 - max;
565  } else
567  }
568  }
569  if (*next_point) {
570  if (chunked && !(this_pktl->pkt.flags & CHUNK_START))
571  goto next_non_null;
572 
573  if (compare(s, &s->packet_buffer_end->pkt, pkt)) {
574  while ( *next_point
575  && ((chunked && !((*next_point)->pkt.flags&CHUNK_START))
576  || !compare(s, &(*next_point)->pkt, pkt)))
577  next_point = &(*next_point)->next;
578  if (*next_point)
579  goto next_non_null;
580  } else {
581  next_point = &(s->packet_buffer_end->next);
582  }
583  }
584  av_assert1(!*next_point);
585 
586  s->packet_buffer_end = this_pktl;
587 next_non_null:
588 
589  this_pktl->next = *next_point;
590 
592  *next_point = this_pktl;
593  return 0;
594 }
595 
597 {
598  AVStream *st = s->streams[pkt->stream_index];
599  AVStream *st2 = s->streams[next->stream_index];
600  int comp = av_compare_ts(next->dts, st2->time_base, pkt->dts,
601  st->time_base);
603  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);
604  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);
605  if (ts == ts2) {
606  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
607  -( 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;
608  ts2=0;
609  }
610  comp= (ts>ts2) - (ts<ts2);
611  }
612 
613  if (comp == 0)
614  return pkt->stream_index < next->stream_index;
615  return comp > 0;
616 }
617 
619  AVPacket *pkt, int flush)
620 {
621  AVPacketList *pktl;
622  int stream_count = 0, noninterleaved_count = 0;
623  int64_t delta_dts_max = 0;
624  int i, ret;
625 
626  if (pkt) {
628  if (ret < 0)
629  return ret;
630  }
631 
632  for (i = 0; i < s->nb_streams; i++) {
633  if (s->streams[i]->last_in_packet_buffer) {
634  ++stream_count;
635  } else if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
636  ++noninterleaved_count;
637  }
638  }
639 
640  if (s->nb_streams == stream_count) {
641  flush = 1;
642  } else if (!flush) {
643  for (i=0; i < s->nb_streams; i++) {
644  if (s->streams[i]->last_in_packet_buffer) {
645  int64_t delta_dts =
647  s->streams[i]->time_base,
648  AV_TIME_BASE_Q) -
652  delta_dts_max= FFMAX(delta_dts_max, delta_dts);
653  }
654  }
655  if (s->nb_streams == stream_count+noninterleaved_count &&
656  delta_dts_max > 20*AV_TIME_BASE) {
657  av_log(s, AV_LOG_DEBUG, "flushing with %d noninterleaved\n", noninterleaved_count);
658  flush = 1;
659  }
660  }
661  if (stream_count && flush) {
662  AVStream *st;
663  pktl = s->packet_buffer;
664  *out = pktl->pkt;
665  st = s->streams[out->stream_index];
666 
667  s->packet_buffer = pktl->next;
668  if (!s->packet_buffer)
669  s->packet_buffer_end = NULL;
670 
671  if (st->last_in_packet_buffer == pktl)
673  av_freep(&pktl);
674 
675  if (s->avoid_negative_ts > 0) {
676  if (out->dts != AV_NOPTS_VALUE) {
677  if (!st->mux_ts_offset && out->dts < 0) {
678  for (i = 0; i < s->nb_streams; i++) {
679  s->streams[i]->mux_ts_offset =
680  av_rescale_q_rnd(-out->dts,
681  st->time_base,
682  s->streams[i]->time_base,
683  AV_ROUND_UP);
684  }
685  }
686  out->dts += st->mux_ts_offset;
687  }
688  if (out->pts != AV_NOPTS_VALUE)
689  out->pts += st->mux_ts_offset;
690  }
691 
692  return 1;
693  } else {
694  av_init_packet(out);
695  return 0;
696  }
697 }
698 
699 #if FF_API_INTERLEAVE_PACKET
700 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
701  AVPacket *pkt, int flush)
702 {
703  return ff_interleave_packet_per_dts(s, out, pkt, flush);
704 }
705 
706 #endif
707 
708 /**
709  * Interleave an AVPacket correctly so it can be muxed.
710  * @param out the interleaved packet will be output here
711  * @param in the input packet
712  * @param flush 1 if no further packets are available as input and all
713  * remaining packets should be output
714  * @return 1 if a packet was output, 0 if no packet could be output,
715  * < 0 if an error occurred
716  */
718 {
719  if (s->oformat->interleave_packet) {
720  int ret = s->oformat->interleave_packet(s, out, in, flush);
721  if (in)
722  av_free_packet(in);
723  return ret;
724  } else
725  return ff_interleave_packet_per_dts(s, out, in, flush);
726 }
727 
729 {
730  int ret, flush = 0;
731 
732  if (pkt) {
733  AVStream *st = s->streams[pkt->stream_index];
734 
735  //FIXME/XXX/HACK drop zero sized packets
736  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && pkt->size == 0)
737  return 0;
738 
739  av_dlog(s, "av_interleaved_write_frame size:%d dts:%s pts:%s\n",
740  pkt->size, av_ts2str(pkt->dts), av_ts2str(pkt->pts));
741  if ((ret = compute_pkt_fields2(s, st, pkt)) < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
742  return ret;
743 
744  if (pkt->dts == AV_NOPTS_VALUE && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
745  return AVERROR(EINVAL);
746  } else {
747  av_dlog(s, "av_interleaved_write_frame FLUSH\n");
748  flush = 1;
749  }
750 
751  for (;; ) {
752  AVPacket opkt;
753  int ret = interleave_packet(s, &opkt, pkt, flush);
754  if (ret <= 0) //FIXME cleanup needed for ret<0 ?
755  return ret;
756 
757  ret = split_write_packet(s, &opkt);
758  if (ret >= 0)
759  s->streams[opkt.stream_index]->nb_frames++;
760 
761  av_free_packet(&opkt);
762  pkt = NULL;
763 
764  if (ret < 0)
765  return ret;
766  if(s->pb && s->pb->error)
767  return s->pb->error;
768  }
769 }
770 
772 {
773  int ret, i;
774 
775  for (;; ) {
776  AVPacket pkt;
777  ret = interleave_packet(s, &pkt, NULL, 1);
778  if (ret < 0) //FIXME cleanup needed for ret<0 ?
779  goto fail;
780  if (!ret)
781  break;
782 
783  ret = split_write_packet(s, &pkt);
784  if (ret >= 0)
785  s->streams[pkt.stream_index]->nb_frames++;
786 
787  av_free_packet(&pkt);
788 
789  if (ret < 0)
790  goto fail;
791  if(s->pb && s->pb->error)
792  goto fail;
793  }
794 
795  if (s->oformat->write_trailer)
796  ret = s->oformat->write_trailer(s);
797 
798 fail:
799  if (s->pb)
800  avio_flush(s->pb);
801  if (ret == 0)
802  ret = s->pb ? s->pb->error : 0;
803  for (i = 0; i < s->nb_streams; i++) {
804  av_freep(&s->streams[i]->priv_data);
805  av_freep(&s->streams[i]->index_entries);
806  }
807  if (s->oformat->priv_class)
809  av_freep(&s->priv_data);
810  return ret;
811 }
812 
813 int av_get_output_timestamp(struct AVFormatContext *s, int stream,
814  int64_t *dts, int64_t *wall)
815 {
816  if (!s->oformat || !s->oformat->get_output_timestamp)
817  return AVERROR(ENOSYS);
818  s->oformat->get_output_timestamp(s, stream, dts, wall);
819  return 0;
820 }