FFmpeg
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 "avio_internal.h"
30 #include "internal.h"
31 #include "os_support.h"
32 #include "avc.h"
33 #include "url.h"
34 #include "isom.h"
35 
36 #include "libavutil/opt.h"
37 #include "libavutil/avstring.h"
38 #include "libavutil/file.h"
39 #include "libavutil/mathematics.h"
40 #include "libavutil/intreadwrite.h"
41 
42 typedef struct Fragment {
43  char file[1024];
44  char infofile[1024];
45  int64_t start_time, duration;
46  int n;
47  int64_t start_pos, size;
48 } Fragment;
49 
50 typedef struct OutputStream {
52  char dirname[1024];
53  uint8_t iobuf[32768];
54  URLContext *out; // Current output stream where all output is written
55  URLContext *out2; // Auxiliary output stream where all output is also written
56  URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere
58  int packets_written;
59  const char *stream_type_tag;
62 
63  const char *fourcc;
64  char *private_str;
66  int audio_tag;
67 } OutputStream;
68 
69 typedef struct SmoothStreamingContext {
70  const AVClass *class; /* Class for private options. */
80 
81 static int ism_write(void *opaque, uint8_t *buf, int buf_size)
82 {
83  OutputStream *os = opaque;
84  if (os->out)
85  ffurl_write(os->out, buf, buf_size);
86  if (os->out2)
87  ffurl_write(os->out2, buf, buf_size);
88  os->cur_pos += buf_size;
89  if (os->cur_pos >= os->tail_pos)
90  os->tail_pos = os->cur_pos;
91  return buf_size;
92 }
93 
94 static int64_t ism_seek(void *opaque, int64_t offset, int whence)
95 {
96  OutputStream *os = opaque;
97  int i;
98  if (whence != SEEK_SET)
99  return AVERROR(ENOSYS);
100  if (os->tail_out) {
101  ffurl_closep(&os->out);
102  ffurl_closep(&os->out2);
103  os->out = os->tail_out;
104  os->tail_out = NULL;
105  }
106  if (offset >= os->cur_start_pos) {
107  if (os->out)
108  ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);
109  os->cur_pos = offset;
110  return offset;
111  }
112  for (i = os->nb_fragments - 1; i >= 0; i--) {
113  Fragment *frag = os->fragments[i];
114  if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {
115  int ret;
117  os->tail_out = os->out;
118  av_dict_set(&opts, "truncate", "0", 0);
121  av_dict_free(&opts);
122  if (ret < 0) {
123  os->out = os->tail_out;
124  os->tail_out = NULL;
125  return ret;
126  }
127  av_dict_set(&opts, "truncate", "0", 0);
130  av_dict_free(&opts);
131  ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);
132  if (os->out2)
133  ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);
134  os->cur_pos = offset;
135  return offset;
136  }
137  }
138  return AVERROR(EIO);
139 }
140 
142 {
143  AVCodecParameters *par = os->ctx->streams[0]->codecpar;
144  uint8_t *ptr = par->extradata;
145  int size = par->extradata_size;
146  int i;
147  if (par->codec_id == AV_CODEC_ID_H264) {
148  ff_avc_write_annexb_extradata(ptr, &ptr, &size);
149  if (!ptr)
150  ptr = par->extradata;
151  }
152  if (!ptr)
153  return;
154  os->private_str = av_mallocz(2*size + 1);
155  if (!os->private_str)
156  goto fail;
157  for (i = 0; i < size; i++)
158  snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);
159 fail:
160  if (ptr != par->extradata)
161  av_free(ptr);
162 }
163 
165 {
166  SmoothStreamingContext *c = s->priv_data;
167  int i, j;
168  if (!c->streams)
169  return;
170  for (i = 0; i < s->nb_streams; i++) {
171  OutputStream *os = &c->streams[i];
172  ffurl_closep(&os->out);
173  ffurl_closep(&os->out2);
174  ffurl_closep(&os->tail_out);
175  if (os->ctx && os->ctx->pb)
176  avio_context_free(&os->ctx->pb);
178  av_freep(&os->private_str);
179  for (j = 0; j < os->nb_fragments; j++)
180  av_freep(&os->fragments[j]);
181  av_freep(&os->fragments);
182  }
183  av_freep(&c->streams);
184 }
185 
186 static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
187 {
188  int removed = 0, i, start = 0;
189  if (os->nb_fragments <= 0)
190  return;
191  if (os->fragments[0]->n > 0)
192  removed = 1;
193  if (final)
194  skip = 0;
195  if (window_size)
196  start = FFMAX(os->nb_fragments - skip - window_size, 0);
197  for (i = start; i < os->nb_fragments - skip; i++) {
198  Fragment *frag = os->fragments[i];
199  if (!final || removed)
200  avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);
201  else
202  avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);
203  }
204 }
205 
206 static int write_manifest(AVFormatContext *s, int final)
207 {
208  SmoothStreamingContext *c = s->priv_data;
209  AVIOContext *out;
210  char filename[1024], temp_filename[1024];
211  int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
212  int64_t duration = 0;
213 
214  snprintf(filename, sizeof(filename), "%s/Manifest", s->url);
215  snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->url);
216  ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL);
217  if (ret < 0) {
218  av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
219  return ret;
220  }
221  avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
222  for (i = 0; i < s->nb_streams; i++) {
223  OutputStream *os = &c->streams[i];
224  if (os->nb_fragments > 0) {
225  Fragment *last = os->fragments[os->nb_fragments - 1];
226  duration = last->start_time + last->duration;
227  }
228  if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
229  video_chunks = os->nb_fragments;
230  video_streams++;
231  } else {
232  audio_chunks = os->nb_fragments;
233  audio_streams++;
234  }
235  }
236  if (!final) {
237  duration = 0;
238  video_chunks = audio_chunks = 0;
239  }
240  if (c->window_size) {
241  video_chunks = FFMIN(video_chunks, c->window_size);
242  audio_chunks = FFMIN(audio_chunks, c->window_size);
243  }
244  avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
245  if (!final)
246  avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
247  avio_printf(out, ">\n");
248  if (c->has_video) {
249  int last = -1, index = 0;
250  avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
251  for (i = 0; i < s->nb_streams; i++) {
252  OutputStream *os = &c->streams[i];
253  if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
254  continue;
255  last = i;
256  avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%"PRId64"\" FourCC=\"%s\" MaxWidth=\"%d\" MaxHeight=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codecpar->bit_rate, os->fourcc, s->streams[i]->codecpar->width, s->streams[i]->codecpar->height, os->private_str);
257  index++;
258  }
259  output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
260  avio_printf(out, "</StreamIndex>\n");
261  }
262  if (c->has_audio) {
263  int last = -1, index = 0;
264  avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
265  for (i = 0; i < s->nb_streams; i++) {
266  OutputStream *os = &c->streams[i];
267  if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
268  continue;
269  last = i;
270  avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%"PRId64"\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codecpar->bit_rate, os->fourcc, s->streams[i]->codecpar->sample_rate, s->streams[i]->codecpar->channels, os->packet_size, os->audio_tag, os->private_str);
271  index++;
272  }
273  output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
274  avio_printf(out, "</StreamIndex>\n");
275  }
276  avio_printf(out, "</SmoothStreamingMedia>\n");
277  avio_flush(out);
279  return ff_rename(temp_filename, filename, s);
280 }
281 
283 {
284  SmoothStreamingContext *c = s->priv_data;
285  int ret = 0, i;
286  const AVOutputFormat *oformat;
287 
288  if (mkdir(s->url, 0777) == -1 && errno != EEXIST) {
289  av_log(s, AV_LOG_ERROR, "mkdir failed\n");
290  return AVERROR(errno);
291  }
292 
293  oformat = av_guess_format("ismv", NULL, NULL);
294  if (!oformat) {
296  }
297 
298  c->streams = av_calloc(s->nb_streams, sizeof(*c->streams));
299  if (!c->streams) {
300  return AVERROR(ENOMEM);
301  }
302 
303  for (i = 0; i < s->nb_streams; i++) {
304  OutputStream *os = &c->streams[i];
306  AVStream *st;
308 
309  if (!s->streams[i]->codecpar->bit_rate) {
310  av_log(s, AV_LOG_WARNING, "No bit rate set for stream %d\n", i);
311  // create a tmp name for the directory of fragments
312  snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(Tmp_%d)", s->url, i);
313  } else {
314  snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%"PRId64")", s->url, s->streams[i]->codecpar->bit_rate);
315  }
316 
317  if (mkdir(os->dirname, 0777) == -1 && errno != EEXIST) {
318  av_log(s, AV_LOG_ERROR, "mkdir failed\n");
319  return AVERROR(errno);
320  }
321 
322  os->ctx = ctx = avformat_alloc_context();
323  if (!ctx) {
324  return AVERROR(ENOMEM);
325  }
326  if ((ret = ff_copy_whiteblacklists(ctx, s)) < 0)
327  return ret;
328  ctx->oformat = oformat;
329  ctx->interrupt_callback = s->interrupt_callback;
330 
331  if (!(st = avformat_new_stream(ctx, NULL))) {
332  return AVERROR(ENOMEM);
333  }
334  avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
335  st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
336  st->time_base = s->streams[i]->time_base;
337 
339  if (!ctx->pb) {
340  return AVERROR(ENOMEM);
341  }
342 
343  av_dict_set_int(&opts, "ism_lookahead", c->lookahead_count, 0);
344  av_dict_set(&opts, "movflags", "frag_custom", 0);
346  av_dict_free(&opts);
347  if (ret < 0) {
348  return ret;
349  }
350  avio_flush(ctx->pb);
351  s->streams[i]->time_base = st->time_base;
352  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
353  c->has_video = 1;
354  os->stream_type_tag = "video";
355  if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
356  os->fourcc = "H264";
357  } else if (st->codecpar->codec_id == AV_CODEC_ID_VC1) {
358  os->fourcc = "WVC1";
359  } else {
360  av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");
361  return AVERROR(EINVAL);
362  }
363  } else {
364  c->has_audio = 1;
365  os->stream_type_tag = "audio";
366  if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
367  os->fourcc = "AACL";
368  os->audio_tag = 0xff;
369  } else if (st->codecpar->codec_id == AV_CODEC_ID_WMAPRO) {
370  os->fourcc = "WMAP";
371  os->audio_tag = 0x0162;
372  } else {
373  av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");
374  return AVERROR(EINVAL);
375  }
376  os->packet_size = st->codecpar->block_align ? st->codecpar->block_align : 4;
377  }
378  get_private_data(os);
379  }
380 
381  if (!c->has_video && c->min_frag_duration <= 0) {
382  av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");
383  return AVERROR(EINVAL);
384  }
385  ret = write_manifest(s, 0);
386  if (ret < 0)
387  return ret;
388 
389  return 0;
390 }
391 
392 static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)
393 {
394  AVIOContext *in;
395  int ret;
396  uint32_t len;
397  if ((ret = s->io_open(s, &in, filename, AVIO_FLAG_READ, NULL)) < 0)
398  return ret;
399  ret = AVERROR(EIO);
400  *moof_size = avio_rb32(in);
401  if (*moof_size < 8 || *moof_size > size)
402  goto fail;
403  if (avio_rl32(in) != MKTAG('m','o','o','f'))
404  goto fail;
405  len = avio_rb32(in);
406  if (len > *moof_size)
407  goto fail;
408  if (avio_rl32(in) != MKTAG('m','f','h','d'))
409  goto fail;
410  avio_seek(in, len - 8, SEEK_CUR);
411  avio_rb32(in); /* traf size */
412  if (avio_rl32(in) != MKTAG('t','r','a','f'))
413  goto fail;
414  while (avio_tell(in) < *moof_size) {
415  uint32_t len = avio_rb32(in);
416  uint32_t tag = avio_rl32(in);
417  int64_t end = avio_tell(in) + len - 8;
418  if (len < 8 || len >= *moof_size)
419  goto fail;
420  if (tag == MKTAG('u','u','i','d')) {
421  static const uint8_t tfxd[] = {
422  0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
423  0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2
424  };
425  uint8_t uuid[16];
426  avio_read(in, uuid, 16);
427  if (!memcmp(uuid, tfxd, 16) && len >= 8 + 16 + 4 + 16) {
428  avio_seek(in, 4, SEEK_CUR);
429  *start_ts = avio_rb64(in);
430  *duration = avio_rb64(in);
431  ret = 0;
432  break;
433  }
434  }
435  avio_seek(in, end, SEEK_SET);
436  }
437 fail:
438  ff_format_io_close(s, &in);
439  return ret;
440 }
441 
442 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)
443 {
444  int err;
445  Fragment *frag;
446  if (os->nb_fragments >= os->fragments_size) {
447  os->fragments_size = (os->fragments_size + 1) * 2;
448  if ((err = av_reallocp_array(&os->fragments, sizeof(*os->fragments),
449  os->fragments_size)) < 0) {
450  os->fragments_size = 0;
451  os->nb_fragments = 0;
452  return err;
453  }
454  }
455  frag = av_mallocz(sizeof(*frag));
456  if (!frag)
457  return AVERROR(ENOMEM);
458  av_strlcpy(frag->file, file, sizeof(frag->file));
459  av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));
460  frag->start_time = start_time;
461  frag->duration = duration;
462  frag->start_pos = start_pos;
463  frag->size = size;
464  frag->n = os->fragment_index;
465  os->fragments[os->nb_fragments++] = frag;
466  os->fragment_index++;
467  return 0;
468 }
469 
470 static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)
471 {
472  AVIOContext *in, *out;
473  int ret = 0;
474  if ((ret = s->io_open(s, &in, infile, AVIO_FLAG_READ, NULL)) < 0)
475  return ret;
476  if ((ret = s->io_open(s, &out, outfile, AVIO_FLAG_WRITE, NULL)) < 0) {
477  ff_format_io_close(s, &in);
478  return ret;
479  }
480  while (size > 0) {
481  uint8_t buf[8192];
482  int n = FFMIN(size, sizeof(buf));
483  n = avio_read(in, buf, n);
484  if (n <= 0) {
485  ret = AVERROR(EIO);
486  break;
487  }
488  avio_write(out, buf, n);
489  size -= n;
490  }
491  avio_flush(out);
493  ff_format_io_close(s, &in);
494  return ret;
495 }
496 
497 static int ism_flush(AVFormatContext *s, int final)
498 {
499  SmoothStreamingContext *c = s->priv_data;
500  int i, ret = 0;
501 
502  for (i = 0; i < s->nb_streams; i++) {
503  OutputStream *os = &c->streams[i];
504  char filename[1024], target_filename[1024], header_filename[1024], curr_dirname[1024];
505  int64_t size;
506  int64_t start_ts, duration, moof_size;
507  if (!os->packets_written)
508  continue;
509 
510  snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
511  ret = ffurl_open_whitelist(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL, s->protocol_whitelist, s->protocol_blacklist, NULL);
512  if (ret < 0)
513  break;
514  os->cur_start_pos = os->tail_pos;
515  av_write_frame(os->ctx, NULL);
516  avio_flush(os->ctx->pb);
517  os->packets_written = 0;
518  if (!os->out || os->tail_out)
519  return AVERROR(EIO);
520 
521  ffurl_closep(&os->out);
522  size = os->tail_pos - os->cur_start_pos;
523  if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0)
524  break;
525 
526  if (!s->streams[i]->codecpar->bit_rate) {
527  int64_t bitrate = (int64_t) size * 8 * AV_TIME_BASE / av_rescale_q(duration, s->streams[i]->time_base, AV_TIME_BASE_Q);
528  if (!bitrate) {
529  av_log(s, AV_LOG_ERROR, "calculating bitrate got zero.\n");
530  ret = AVERROR(EINVAL);
531  return ret;
532  }
533 
534  av_log(s, AV_LOG_DEBUG, "calculated bitrate: %"PRId64"\n", bitrate);
535  s->streams[i]->codecpar->bit_rate = bitrate;
536  memcpy(curr_dirname, os->dirname, sizeof(os->dirname));
537  snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%"PRId64")", s->url, s->streams[i]->codecpar->bit_rate);
538  snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
539 
540  // rename the tmp folder back to the correct name since we now have the bitrate
541  if ((ret = ff_rename((const char*)curr_dirname, os->dirname, s)) < 0)
542  return ret;
543  }
544 
545  snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
546  snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
547  copy_moof(s, filename, header_filename, moof_size);
548  ret = ff_rename(filename, target_filename, s);
549  if (ret < 0)
550  break;
551  add_fragment(os, target_filename, header_filename, start_ts, duration,
552  os->cur_start_pos, size);
553  }
554 
555  if (c->window_size || (final && c->remove_at_exit)) {
556  for (i = 0; i < s->nb_streams; i++) {
557  OutputStream *os = &c->streams[i];
558  int j;
559  int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count;
560  if (final && c->remove_at_exit)
561  remove = os->nb_fragments;
562  if (remove > 0) {
563  for (j = 0; j < remove; j++) {
564  unlink(os->fragments[j]->file);
565  unlink(os->fragments[j]->infofile);
566  av_freep(&os->fragments[j]);
567  }
568  os->nb_fragments -= remove;
569  memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments));
570  }
571  if (final && c->remove_at_exit)
572  rmdir(os->dirname);
573  }
574  }
575 
576  if (ret >= 0)
577  ret = write_manifest(s, final);
578  return ret;
579 }
580 
582 {
583  SmoothStreamingContext *c = s->priv_data;
584  AVStream *st = s->streams[pkt->stream_index];
585  FFStream *const sti = ffstream(st);
586  OutputStream *os = &c->streams[pkt->stream_index];
587  int64_t end_dts = (c->nb_fragments + 1) * (int64_t) c->min_frag_duration;
588  int ret;
589 
590  if (sti->first_dts == AV_NOPTS_VALUE)
591  sti->first_dts = pkt->dts;
592 
593  if ((!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
594  av_compare_ts(pkt->dts - sti->first_dts, st->time_base,
595  end_dts, AV_TIME_BASE_Q) >= 0 &&
597 
598  if ((ret = ism_flush(s, 0)) < 0)
599  return ret;
600  c->nb_fragments++;
601  }
602 
603  os->packets_written++;
604  return ff_write_chained(os->ctx, 0, pkt, s, 0);
605 }
606 
608 {
609  SmoothStreamingContext *c = s->priv_data;
610  ism_flush(s, 1);
611 
612  if (c->remove_at_exit) {
613  char filename[1024];
614  snprintf(filename, sizeof(filename), "%s/Manifest", s->url);
615  unlink(filename);
616  rmdir(s->url);
617  }
618 
619  return 0;
620 }
621 
622 #define OFFSET(x) offsetof(SmoothStreamingContext, x)
623 #define E AV_OPT_FLAG_ENCODING_PARAM
624 static const AVOption options[] = {
625  { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
626  { "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 },
627  { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E },
628  { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },
629  { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
630  { NULL },
631 };
632 
633 static const AVClass ism_class = {
634  .class_name = "smooth streaming muxer",
635  .item_name = av_default_item_name,
636  .option = options,
637  .version = LIBAVUTIL_VERSION_INT,
638 };
639 
640 
642  .name = "smoothstreaming",
643  .long_name = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"),
644  .priv_data_size = sizeof(SmoothStreamingContext),
645  .audio_codec = AV_CODEC_ID_AAC,
646  .video_codec = AV_CODEC_ID_H264,
651  .deinit = ism_free,
652  .priv_class = &ism_class,
653 };
SmoothStreamingContext::remove_at_exit
int remove_at_exit
Definition: smoothstreamingenc.c:75
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
OutputStream::cur_start_pos
int64_t cur_start_pos
Definition: smoothstreamingenc.c:57
AVOutputFormat::name
const char * name
Definition: avformat.h:497
AVERROR
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
opt.h
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:760
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
av_compare_ts
int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b)
Compare two timestamps each in its own time base.
Definition: mathematics.c:146
out
FILE * out
Definition: movenc.c:54
FFStream::first_dts
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: internal.h:430
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
ffurl_seek
int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
Change the position that will be used by the next read/write operation on the resource accessed by h.
Definition: avio.c:428
OutputStream::fragment_index
int fragment_index
Definition: hdsenc.c:55
avio_context_free
void avio_context_free(AVIOContext **s)
Free the supplied IO context and everything associated with it.
Definition: aviobuf.c:152
AVFormatContext::protocol_blacklist
char * protocol_blacklist
',' separated list of disallowed protocols.
Definition: avformat.h:1765
AV_TIME_BASE_Q
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
OutputStream::packets_written
uint64_t packets_written
Definition: ffmpeg.h:538
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1261
deinit
static void deinit(AVFormatContext *s)
Definition: chromaprint.c:50
index
fg index
Definition: ffmpeg_filter.c:168
SmoothStreamingContext
Definition: smoothstreamingenc.c:69
AVOption
AVOption.
Definition: opt.h:247
outfile
FILE * outfile
Definition: audiogen.c:96
Fragment::start_time
int64_t start_time
Definition: hdsenc.c:41
copy_moof
static int copy_moof(AVFormatContext *s, const char *infile, const char *outfile, int64_t size)
Definition: smoothstreamingenc.c:470
float.h
mathematics.h
AVDictionary
Definition: dict.c:30
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
SmoothStreamingContext::extra_window_size
int extra_window_size
Definition: smoothstreamingenc.c:72
OutputStream::nb_fragments
int nb_fragments
Definition: hdsenc.c:55
OutputStream::audio_tag
int audio_tag
Definition: smoothstreamingenc.c:66
SmoothStreamingContext::nb_fragments
int nb_fragments
Definition: smoothstreamingenc.c:78
os_support.h
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:425
get_private_data
static void get_private_data(OutputStream *os)
Definition: smoothstreamingenc.c:141
Fragment
Definition: hdsenc.c:39
AVFormatContext::interrupt_callback
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1460
OutputStream::stream_type_tag
const char * stream_type_tag
Definition: smoothstreamingenc.c:59
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:434
fail
#define fail()
Definition: checkasm.h:127
Fragment::file
char file[1024]
Definition: hdsenc.c:40
SmoothStreamingContext::has_audio
int has_audio
Definition: smoothstreamingenc.c:77
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:504
ff_rename
int ff_rename(const char *url_src, const char *url_dst, void *logctx)
Wrap ffurl_move() and log if error happens.
Definition: avio.c:665
OutputStream::tail_out
URLContext * tail_out
Definition: smoothstreamingenc.c:56
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:790
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
SmoothStreamingContext::window_size
int window_size
Definition: smoothstreamingenc.c:71
ff_write_chained
int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt, AVFormatContext *src, int interleave)
Write a packet to another muxer than the one the user originally intended.
Definition: mux.c:1306
duration
int64_t duration
Definition: movenc.c:64
ffurl_open_whitelist
int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist, URLContext *parent)
Create an URLContext for accessing to the resource indicated by url, and open it.
Definition: avio.c:306
OFFSET
#define OFFSET(x)
Definition: smoothstreamingenc.c:622
intreadwrite.h
Fragment::start_pos
int64_t start_pos
Definition: smoothstreamingenc.c:47
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_CODEC_ID_WMAPRO
@ AV_CODEC_ID_WMAPRO
Definition: codec_id.h:460
ism_flush
static int ism_flush(AVFormatContext *s, int final)
Definition: smoothstreamingenc.c:497
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AV_OPT_TYPE_INT64
@ AV_OPT_TYPE_INT64
Definition: opt.h:225
ism_write_trailer
static int ism_write_trailer(AVFormatContext *s)
Definition: smoothstreamingenc.c:607
AVIO_FLAG_WRITE
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:622
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
ctx
AVFormatContext * ctx
Definition: movenc.c:48
av_rescale_q
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:141
ff_smoothstreaming_muxer
const AVOutputFormat ff_smoothstreaming_muxer
Definition: smoothstreamingenc.c:641
ism_seek
static int64_t ism_seek(void *opaque, int64_t offset, int whence)
Definition: smoothstreamingenc.c:94
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:77
avformat_write_header
av_warn_unused_result int avformat_write_header(AVFormatContext *s, AVDictionary **options)
Allocate the stream private data and write the stream header to an output media file.
Definition: mux.c:472
ism_write
static int ism_write(void *opaque, uint8_t *buf, int buf_size)
Definition: smoothstreamingenc.c:81
avio_flush
void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:252
AVFormatContext
Format I/O context.
Definition: avformat.h:1193
internal.h
opts
AVDictionary * opts
Definition: movenc.c:50
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1088
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:958
NULL
#define NULL
Definition: coverity.c:32
isom.h
OutputStream::dirname
char dirname[1024]
Definition: smoothstreamingenc.c:52
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:98
AVFormatContext::protocol_whitelist
char * protocol_whitelist
',' separated list of allowed protocols.
Definition: avformat.h:1730
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
avio_rb64
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:937
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1235
avc.h
av_write_frame
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file.
Definition: mux.c:1187
Fragment::duration
int64_t duration
Definition: hdsenc.c:41
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
ism_free
static void ism_free(AVFormatContext *s)
Definition: smoothstreamingenc.c:164
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
AV_CODEC_ID_AAC
@ AV_CODEC_ID_AAC
Definition: codec_id.h:425
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
avformat_alloc_context
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:154
FFStream
Definition: internal.h:196
start_time
static int64_t start_time
Definition: ffplay.c:330
Fragment::size
int64_t size
Definition: smoothstreamingenc.c:47
ff_copy_whiteblacklists
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:115
size
int size
Definition: twinvq_data.h:10344
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AVFMT_NOFILE
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:464
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:997
SmoothStreamingContext::min_frag_duration
int min_frag_duration
Definition: smoothstreamingenc.c:74
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:372
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:232
av_reallocp_array
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
Allocate, reallocate, or free an array through a pointer to a pointer.
Definition: mem.c:232
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
OutputStream::fourcc
const char * fourcc
Definition: smoothstreamingenc.c:63
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:379
av_dict_free
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values.
Definition: dict.c:203
bitrate
int64_t bitrate
Definition: h264_levels.c:131
write_manifest
static int write_manifest(AVFormatContext *s, int final)
Definition: smoothstreamingenc.c:206
OutputStream::private_str
char * private_str
Definition: smoothstreamingenc.c:64
SmoothStreamingContext::lookahead_count
int lookahead_count
Definition: smoothstreamingenc.c:73
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:727
avcodec_parameters_copy
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: codec_par.c:72
URLContext
Definition: url.h:38
AVFMT_GLOBALHEADER
#define AVFMT_GLOBALHEADER
Format wants global header.
Definition: avformat.h:467
AVOutputFormat
Definition: avformat.h:496
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
avio_internal.h
AVERROR_MUXER_NOT_FOUND
#define AVERROR_MUXER_NOT_FOUND
Muxer not found.
Definition: error.h:62
AV_TIME_BASE
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:177
OutputStream::tail_pos
int64_t tail_pos
Definition: smoothstreamingenc.c:57
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
avio_alloc_context
AVIOContext * avio_alloc_context(unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
Allocate and initialize an AVIOContext for buffered I/O.
Definition: aviobuf.c:135
url.h
OutputStream::ctx
AVFormatContext * ctx
Definition: dashenc.c:101
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:263
AV_CODEC_ID_VC1
@ AV_CODEC_ID_VC1
Definition: codec_id.h:120
len
int len
Definition: vorbis_enc_data.h:426
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:271
ism_write_packet
static int ism_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: smoothstreamingenc.c:581
ffurl_closep
int ffurl_closep(URLContext **hh)
Close the resource accessed by the URLContext h, and free the memory used by it.
Definition: avio.c:438
tag
uint32_t tag
Definition: movenc.c:1595
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:928
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:260
AVClass::class_name
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:71
AVFormatContext::oformat
const struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1212
SmoothStreamingContext::streams
OutputStream * streams
Definition: smoothstreamingenc.c:76
ism_class
static const AVClass ism_class
Definition: smoothstreamingenc.c:633
options
static const AVOption options[]
Definition: smoothstreamingenc.c:624
avformat.h
parse_fragment
static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)
Definition: smoothstreamingenc.c:392
OutputStream::fragments_size
int fragments_size
Definition: hdsenc.c:55
OutputStream::fragments
Fragment ** fragments
Definition: hdsenc.c:56
avio_printf
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
Writes a formatted string to the context.
OutputStream::out
URLContext * out
Definition: smoothstreamingenc.c:54
ff_avc_write_annexb_extradata
int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size)
Definition: avc.c:221
OutputStream::iobuf
uint8_t iobuf[32768]
Definition: hdsenc.c:50
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:224
ism_write_header
static int ism_write_header(AVFormatContext *s)
Definition: smoothstreamingenc.c:282
avformat_free_context
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: utils.c:680
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:641
ffurl_write
int ffurl_write(URLContext *h, const unsigned char *buf, int size)
Write size bytes from buf to the resource accessed by h.
Definition: avio.c:415
output_chunk_list
static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
Definition: smoothstreamingenc.c:186
file.h
AVPacket::stream_index
int stream_index
Definition: packet.h:375
OutputStream::out
AVIOContext * out
Definition: dashenc.c:103
av_dict_set_int
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags)
Convenience wrapper for av_dict_set that converts the value to a string and stores it.
Definition: dict.c:147
ff_format_io_close
void ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: utils.c:1832
AVIO_FLAG_READ
#define AVIO_FLAG_READ
read-only
Definition: avio.h:621
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
av_guess_format
const AVOutputFormat * av_guess_format(const char *short_name, const char *filename, const char *mime_type)
Return the output format in the list of registered output formats which best matches the provided par...
Definition: format.c:51
OutputStream::out2
URLContext * out2
Definition: smoothstreamingenc.c:55
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:241
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
av_dict_set
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
OutputStream::cur_pos
int64_t cur_pos
Definition: smoothstreamingenc.c:57
OutputStream
Definition: muxing.c:54
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_strlcpy
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
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
OutputStream::packet_size
int packet_size
Definition: smoothstreamingenc.c:65
avstring.h
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:347
snprintf
#define snprintf
Definition: snprintf.h:34
Fragment::n
int n
Definition: hdsenc.c:42
SmoothStreamingContext::has_video
int has_video
Definition: smoothstreamingenc.c:77
Fragment::infofile
char infofile[1024]
Definition: smoothstreamingenc.c:44
E
#define E
Definition: smoothstreamingenc.c:623
add_fragment
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)
Definition: smoothstreamingenc.c:442