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smoothstreamingenc.c
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1 /*
2  * Live smooth streaming fragmenter
3  * Copyright (c) 2012 Martin Storsjo
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 "config.h"
23 #include <float.h>
24 #if HAVE_UNISTD_H
25 #include <unistd.h>
26 #endif
27 
28 #include "avformat.h"
29 #include "internal.h"
30 #include "os_support.h"
31 #include "avc.h"
32 #include "url.h"
33 #include "isom.h"
34 
35 #include "libavutil/opt.h"
36 #include "libavutil/avstring.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/intreadwrite.h"
39 
40 typedef struct {
41  char file[1024];
42  char infofile[1024];
43  int64_t start_time, duration;
44  int n;
45  int64_t start_pos, size;
46 } Fragment;
47 
48 typedef struct {
49  AVFormatContext *ctx;
50  int ctx_inited;
51  char dirname[1024];
52  uint8_t iobuf[32768];
53  URLContext *out; // Current output stream where all output is written
54  URLContext *out2; // Auxiliary output stream where all output is also written
55  URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere
56  int64_t tail_pos, cur_pos, cur_start_pos;
57  int packets_written;
58  const char *stream_type_tag;
59  int nb_fragments, fragments_size, fragment_index;
60  Fragment **fragments;
61 
62  const char *fourcc;
63  char *private_str;
65  int audio_tag;
66 } OutputStream;
67 
68 typedef struct {
69  const AVClass *class; /* Class for private options. */
76  int has_video, has_audio;
79 
80 static int ism_write(void *opaque, uint8_t *buf, int buf_size)
81 {
82  OutputStream *os = opaque;
83  if (os->out)
84  ffurl_write(os->out, buf, buf_size);
85  if (os->out2)
86  ffurl_write(os->out2, buf, buf_size);
87  os->cur_pos += buf_size;
88  if (os->cur_pos >= os->tail_pos)
89  os->tail_pos = os->cur_pos;
90  return buf_size;
91 }
92 
93 static int64_t ism_seek(void *opaque, int64_t offset, int whence)
94 {
95  OutputStream *os = opaque;
96  int i;
97  if (whence != SEEK_SET)
98  return AVERROR(ENOSYS);
99  if (os->tail_out) {
100  if (os->out) {
101  ffurl_close(os->out);
102  }
103  if (os->out2) {
104  ffurl_close(os->out2);
105  }
106  os->out = os->tail_out;
107  os->out2 = NULL;
108  os->tail_out = NULL;
109  }
110  if (offset >= os->cur_start_pos) {
111  if (os->out)
112  ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);
113  os->cur_pos = offset;
114  return offset;
115  }
116  for (i = os->nb_fragments - 1; i >= 0; i--) {
117  Fragment *frag = os->fragments[i];
118  if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {
119  int ret;
120  AVDictionary *opts = NULL;
121  os->tail_out = os->out;
122  av_dict_set(&opts, "truncate", "0", 0);
123  ret = ffurl_open(&os->out, frag->file, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);
124  av_dict_free(&opts);
125  if (ret < 0) {
126  os->out = os->tail_out;
127  os->tail_out = NULL;
128  return ret;
129  }
130  av_dict_set(&opts, "truncate", "0", 0);
132  av_dict_free(&opts);
133  ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);
134  if (os->out2)
135  ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);
136  os->cur_pos = offset;
137  return offset;
138  }
139  }
140  return AVERROR(EIO);
141 }
142 
144 {
145  AVCodecContext *codec = os->ctx->streams[0]->codec;
146  uint8_t *ptr = codec->extradata;
147  int size = codec->extradata_size;
148  int i;
149  if (codec->codec_id == AV_CODEC_ID_H264) {
150  ff_avc_write_annexb_extradata(ptr, &ptr, &size);
151  if (!ptr)
152  ptr = codec->extradata;
153  }
154  if (!ptr)
155  return;
156  os->private_str = av_mallocz(2*size + 1);
157  if (!os->private_str)
158  goto fail;
159  for (i = 0; i < size; i++)
160  snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);
161 fail:
162  if (ptr != codec->extradata)
163  av_free(ptr);
164 }
165 
167 {
169  int i, j;
170  if (!c->streams)
171  return;
172  for (i = 0; i < s->nb_streams; i++) {
173  OutputStream *os = &c->streams[i];
174  ffurl_close(os->out);
175  ffurl_close(os->out2);
176  ffurl_close(os->tail_out);
177  os->out = os->out2 = os->tail_out = NULL;
178  if (os->ctx && os->ctx_inited)
179  av_write_trailer(os->ctx);
180  if (os->ctx && os->ctx->pb)
181  av_free(os->ctx->pb);
182  if (os->ctx)
184  av_free(os->private_str);
185  for (j = 0; j < os->nb_fragments; j++)
186  av_free(os->fragments[j]);
187  av_free(os->fragments);
188  }
189  av_freep(&c->streams);
190 }
191 
192 static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
193 {
194  int removed = 0, i, start = 0;
195  if (os->nb_fragments <= 0)
196  return;
197  if (os->fragments[0]->n > 0)
198  removed = 1;
199  if (final)
200  skip = 0;
201  if (window_size)
202  start = FFMAX(os->nb_fragments - skip - window_size, 0);
203  for (i = start; i < os->nb_fragments - skip; i++) {
204  Fragment *frag = os->fragments[i];
205  if (!final || removed)
206  avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);
207  else
208  avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);
209  }
210 }
211 
212 static int write_manifest(AVFormatContext *s, int final)
213 {
215  AVIOContext *out;
216  char filename[1024], temp_filename[1024];
217  int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
218  int64_t duration = 0;
219 
220  snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);
221  snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->filename);
222  ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
223  if (ret < 0) {
224  av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
225  return ret;
226  }
227  avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
228  for (i = 0; i < s->nb_streams; i++) {
229  OutputStream *os = &c->streams[i];
230  if (os->nb_fragments > 0) {
231  Fragment *last = os->fragments[os->nb_fragments - 1];
232  duration = last->start_time + last->duration;
233  }
234  if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
235  video_chunks = os->nb_fragments;
236  video_streams++;
237  } else {
238  audio_chunks = os->nb_fragments;
239  audio_streams++;
240  }
241  }
242  if (!final) {
243  duration = 0;
244  video_chunks = audio_chunks = 0;
245  }
246  if (c->window_size) {
247  video_chunks = FFMIN(video_chunks, c->window_size);
248  audio_chunks = FFMIN(audio_chunks, c->window_size);
249  }
250  avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
251  if (!final)
252  avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
253  avio_printf(out, ">\n");
254  if (c->has_video) {
255  int last = -1, index = 0;
256  avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
257  for (i = 0; i < s->nb_streams; i++) {
258  OutputStream *os = &c->streams[i];
260  continue;
261  last = i;
262  avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%d\" FourCC=\"%s\" MaxWidth=\"%d\" MaxHeight=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codec->bit_rate, os->fourcc, s->streams[i]->codec->width, s->streams[i]->codec->height, os->private_str);
263  index++;
264  }
265  output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
266  avio_printf(out, "</StreamIndex>\n");
267  }
268  if (c->has_audio) {
269  int last = -1, index = 0;
270  avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
271  for (i = 0; i < s->nb_streams; i++) {
272  OutputStream *os = &c->streams[i];
274  continue;
275  last = i;
276  avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%d\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codec->bit_rate, os->fourcc, s->streams[i]->codec->sample_rate, s->streams[i]->codec->channels, os->packet_size, os->audio_tag, os->private_str);
277  index++;
278  }
279  output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
280  avio_printf(out, "</StreamIndex>\n");
281  }
282  avio_printf(out, "</SmoothStreamingMedia>\n");
283  avio_flush(out);
284  avio_close(out);
285  rename(temp_filename, filename);
286  return 0;
287 }
288 
290 {
292  int ret = 0, i;
293  AVOutputFormat *oformat;
294 
295  if (mkdir(s->filename, 0777) < 0) {
296  av_log(s, AV_LOG_ERROR, "mkdir failed\n");
297  ret = AVERROR(errno);
298  goto fail;
299  }
300 
301  oformat = av_guess_format("ismv", NULL, NULL);
302  if (!oformat) {
304  goto fail;
305  }
306 
307  c->streams = av_mallocz_array(s->nb_streams, sizeof(*c->streams));
308  if (!c->streams) {
309  ret = AVERROR(ENOMEM);
310  goto fail;
311  }
312 
313  for (i = 0; i < s->nb_streams; i++) {
314  OutputStream *os = &c->streams[i];
315  AVFormatContext *ctx;
316  AVStream *st;
317  AVDictionary *opts = NULL;
318 
319  if (!s->streams[i]->codec->bit_rate) {
320  av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i);
321  ret = AVERROR(EINVAL);
322  goto fail;
323  }
324  snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%d)", s->filename, s->streams[i]->codec->bit_rate);
325  if (mkdir(os->dirname, 0777) < 0) {
326  ret = AVERROR(errno);
327  av_log(s, AV_LOG_ERROR, "mkdir failed\n");
328  goto fail;
329  }
330 
331  ctx = avformat_alloc_context();
332  if (!ctx) {
333  ret = AVERROR(ENOMEM);
334  goto fail;
335  }
336  os->ctx = ctx;
337  ctx->oformat = oformat;
339 
340  if (!(st = avformat_new_stream(ctx, NULL))) {
341  ret = AVERROR(ENOMEM);
342  goto fail;
343  }
346 
347  ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, ism_write, ism_seek);
348  if (!ctx->pb) {
349  ret = AVERROR(ENOMEM);
350  goto fail;
351  }
352 
353  av_dict_set_int(&opts, "ism_lookahead", c->lookahead_count, 0);
354  av_dict_set(&opts, "movflags", "frag_custom", 0);
355  if ((ret = avformat_write_header(ctx, &opts)) < 0) {
356  goto fail;
357  }
358  os->ctx_inited = 1;
359  avio_flush(ctx->pb);
360  av_dict_free(&opts);
361  s->streams[i]->time_base = st->time_base;
362  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
363  c->has_video = 1;
364  os->stream_type_tag = "video";
365  if (st->codec->codec_id == AV_CODEC_ID_H264) {
366  os->fourcc = "H264";
367  } else if (st->codec->codec_id == AV_CODEC_ID_VC1) {
368  os->fourcc = "WVC1";
369  } else {
370  av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");
371  ret = AVERROR(EINVAL);
372  goto fail;
373  }
374  } else {
375  c->has_audio = 1;
376  os->stream_type_tag = "audio";
377  if (st->codec->codec_id == AV_CODEC_ID_AAC) {
378  os->fourcc = "AACL";
379  os->audio_tag = 0xff;
380  } else if (st->codec->codec_id == AV_CODEC_ID_WMAPRO) {
381  os->fourcc = "WMAP";
382  os->audio_tag = 0x0162;
383  } else {
384  av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");
385  ret = AVERROR(EINVAL);
386  goto fail;
387  }
388  os->packet_size = st->codec->block_align ? st->codec->block_align : 4;
389  }
390  get_private_data(os);
391  }
392 
393  if (!c->has_video && c->min_frag_duration <= 0) {
394  av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");
395  ret = AVERROR(EINVAL);
396  }
397  ret = write_manifest(s, 0);
398 
399 fail:
400  if (ret)
401  ism_free(s);
402  return ret;
403 }
404 
405 static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)
406 {
407  AVIOContext *in;
408  int ret;
409  uint32_t len;
410  if ((ret = avio_open2(&in, filename, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)
411  return ret;
412  ret = AVERROR(EIO);
413  *moof_size = avio_rb32(in);
414  if (*moof_size < 8 || *moof_size > size)
415  goto fail;
416  if (avio_rl32(in) != MKTAG('m','o','o','f'))
417  goto fail;
418  len = avio_rb32(in);
419  if (len > *moof_size)
420  goto fail;
421  if (avio_rl32(in) != MKTAG('m','f','h','d'))
422  goto fail;
423  avio_seek(in, len - 8, SEEK_CUR);
424  avio_rb32(in); /* traf size */
425  if (avio_rl32(in) != MKTAG('t','r','a','f'))
426  goto fail;
427  while (avio_tell(in) < *moof_size) {
428  uint32_t len = avio_rb32(in);
429  uint32_t tag = avio_rl32(in);
430  int64_t end = avio_tell(in) + len - 8;
431  if (len < 8 || len >= *moof_size)
432  goto fail;
433  if (tag == MKTAG('u','u','i','d')) {
434  static const uint8_t tfxd[] = {
435  0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
436  0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2
437  };
438  uint8_t uuid[16];
439  avio_read(in, uuid, 16);
440  if (!memcmp(uuid, tfxd, 16) && len >= 8 + 16 + 4 + 16) {
441  avio_seek(in, 4, SEEK_CUR);
442  *start_ts = avio_rb64(in);
443  *duration = avio_rb64(in);
444  ret = 0;
445  break;
446  }
447  }
448  avio_seek(in, end, SEEK_SET);
449  }
450 fail:
451  avio_close(in);
452  return ret;
453 }
454 
455 static int add_fragment(OutputStream *os, const char *file, const char *infofile, int64_t start_time, int64_t duration, int64_t start_pos, int64_t size)
456 {
457  int err;
458  Fragment *frag;
459  if (os->nb_fragments >= os->fragments_size) {
460  os->fragments_size = (os->fragments_size + 1) * 2;
461  if ((err = av_reallocp(&os->fragments, sizeof(*os->fragments) *
462  os->fragments_size)) < 0) {
463  os->fragments_size = 0;
464  os->nb_fragments = 0;
465  return err;
466  }
467  }
468  frag = av_mallocz(sizeof(*frag));
469  if (!frag)
470  return AVERROR(ENOMEM);
471  av_strlcpy(frag->file, file, sizeof(frag->file));
472  av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));
473  frag->start_time = start_time;
474  frag->duration = duration;
475  frag->start_pos = start_pos;
476  frag->size = size;
477  frag->n = os->fragment_index;
478  os->fragments[os->nb_fragments++] = frag;
479  os->fragment_index++;
480  return 0;
481 }
482 
483 static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)
484 {
485  AVIOContext *in, *out;
486  int ret = 0;
487  if ((ret = avio_open2(&in, infile, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)
488  return ret;
489  if ((ret = avio_open2(&out, outfile, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) {
490  avio_close(in);
491  return ret;
492  }
493  while (size > 0) {
494  uint8_t buf[8192];
495  int n = FFMIN(size, sizeof(buf));
496  n = avio_read(in, buf, n);
497  if (n <= 0) {
498  ret = AVERROR(EIO);
499  break;
500  }
501  avio_write(out, buf, n);
502  size -= n;
503  }
504  avio_flush(out);
505  avio_close(out);
506  avio_close(in);
507  return ret;
508 }
509 
510 static int ism_flush(AVFormatContext *s, int final)
511 {
513  int i, ret = 0;
514 
515  for (i = 0; i < s->nb_streams; i++) {
516  OutputStream *os = &c->streams[i];
517  char filename[1024], target_filename[1024], header_filename[1024];
518  int64_t start_pos = os->tail_pos, size;
519  int64_t start_ts, duration, moof_size;
520  if (!os->packets_written)
521  continue;
522 
523  snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
524  ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
525  if (ret < 0)
526  break;
527  os->cur_start_pos = os->tail_pos;
528  av_write_frame(os->ctx, NULL);
529  avio_flush(os->ctx->pb);
530  os->packets_written = 0;
531  if (!os->out || os->tail_out)
532  return AVERROR(EIO);
533 
534  ffurl_close(os->out);
535  os->out = NULL;
536  size = os->tail_pos - start_pos;
537  if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0)
538  break;
539  snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
540  snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
541  copy_moof(s, filename, header_filename, moof_size);
542  rename(filename, target_filename);
543  add_fragment(os, target_filename, header_filename, start_ts, duration, start_pos, size);
544  }
545 
546  if (c->window_size || (final && c->remove_at_exit)) {
547  for (i = 0; i < s->nb_streams; i++) {
548  OutputStream *os = &c->streams[i];
549  int j;
550  int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count;
551  if (final && c->remove_at_exit)
552  remove = os->nb_fragments;
553  if (remove > 0) {
554  for (j = 0; j < remove; j++) {
555  unlink(os->fragments[j]->file);
556  unlink(os->fragments[j]->infofile);
557  av_free(os->fragments[j]);
558  }
559  os->nb_fragments -= remove;
560  memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments));
561  }
562  if (final && c->remove_at_exit)
563  rmdir(os->dirname);
564  }
565  }
566 
567  if (ret >= 0)
568  ret = write_manifest(s, final);
569  return ret;
570 }
571 
573 {
575  AVStream *st = s->streams[pkt->stream_index];
576  OutputStream *os = &c->streams[pkt->stream_index];
577  int64_t end_dts = (c->nb_fragments + 1LL) * c->min_frag_duration;
578  int ret;
579 
580  if (st->first_dts == AV_NOPTS_VALUE)
581  st->first_dts = pkt->dts;
582 
583  if ((!c->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
584  av_compare_ts(pkt->dts - st->first_dts, st->time_base,
585  end_dts, AV_TIME_BASE_Q) >= 0 &&
586  pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) {
587 
588  if ((ret = ism_flush(s, 0)) < 0)
589  return ret;
590  c->nb_fragments++;
591  }
592 
593  os->packets_written++;
594  return ff_write_chained(os->ctx, 0, pkt, s, 0);
595 }
596 
598 {
600  ism_flush(s, 1);
601 
602  if (c->remove_at_exit) {
603  char filename[1024];
604  snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);
605  unlink(filename);
606  rmdir(s->filename);
607  }
608 
609  ism_free(s);
610  return 0;
611 }
612 
613 #define OFFSET(x) offsetof(SmoothStreamingContext, x)
614 #define E AV_OPT_FLAG_ENCODING_PARAM
615 static const AVOption options[] = {
616  { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
617  { "extra_window_size", "number of fragments kept outside of the manifest before removing from disk", OFFSET(extra_window_size), AV_OPT_TYPE_INT, { .i64 = 5 }, 0, INT_MAX, E },
618  { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E },
619  { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },
620  { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
621  { NULL },
622 };
623 
624 static const AVClass ism_class = {
625  .class_name = "smooth streaming muxer",
626  .item_name = av_default_item_name,
627  .option = options,
628  .version = LIBAVUTIL_VERSION_INT,
629 };
630 
631 
633  .name = "smoothstreaming",
634  .long_name = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"),
635  .priv_data_size = sizeof(SmoothStreamingContext),
636  .audio_codec = AV_CODEC_ID_AAC,
637  .video_codec = AV_CODEC_ID_H264,
642  .codec_tag = (const AVCodecTag* const []){ ff_mp4_obj_type, 0 },
643  .priv_class = &ism_class,
644 };