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 #if HAVE_UNISTD_H
24 #include <unistd.h>
25 #endif
26 
27 #include "avformat.h"
28 #include "internal.h"
29 #include "mux.h"
30 #include "os_support.h"
31 #include "avc.h"
32 #include "url.h"
33 
34 #include "libavutil/mem.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/avstring.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/uuid.h"
39 
40 typedef struct Fragment {
42  int n;
44  char file[1024];
45  char infofile[1024];
46 } Fragment;
47 
48 typedef struct OutputStream {
50  URLContext *out; // Current output stream where all output is written
51  URLContext *out2; // Auxiliary output stream where all output is also written
52  URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere
54  int packets_written;
55  const char *stream_type_tag;
58 
59  const char *fourcc;
60  char *private_str;
62  int audio_tag;
63  char dirname[1024];
64  uint8_t iobuf[32768];
65 } OutputStream;
66 
67 typedef struct SmoothStreamingContext {
68  const AVClass *class; /* Class for private options. */
78 
79 static int ism_write(void *opaque, const uint8_t *buf, int buf_size)
80 {
81  OutputStream *os = opaque;
82  if (os->out)
83  ffurl_write(os->out, buf, buf_size);
84  if (os->out2)
85  ffurl_write(os->out2, buf, buf_size);
86  os->cur_pos += buf_size;
87  if (os->cur_pos >= os->tail_pos)
88  os->tail_pos = os->cur_pos;
89  return buf_size;
90 }
91 
92 static int64_t ism_seek(void *opaque, int64_t offset, int whence)
93 {
94  OutputStream *os = opaque;
95  int i;
96  if (whence != SEEK_SET)
97  return AVERROR(ENOSYS);
98  if (os->tail_out) {
99  ffurl_closep(&os->out);
100  ffurl_closep(&os->out2);
101  os->out = os->tail_out;
102  os->tail_out = NULL;
103  }
104  if (offset >= os->cur_start_pos) {
105  if (os->out)
106  ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);
107  os->cur_pos = offset;
108  return offset;
109  }
110  for (i = os->nb_fragments - 1; i >= 0; i--) {
111  Fragment *frag = os->fragments[i];
112  if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {
113  int ret;
115  os->tail_out = os->out;
116  av_dict_set(&opts, "truncate", "0", 0);
119  av_dict_free(&opts);
120  if (ret < 0) {
121  os->out = os->tail_out;
122  os->tail_out = NULL;
123  return ret;
124  }
125  av_dict_set(&opts, "truncate", "0", 0);
128  av_dict_free(&opts);
129  ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);
130  if (os->out2)
131  ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);
132  os->cur_pos = offset;
133  return offset;
134  }
135  }
136  return AVERROR(EIO);
137 }
138 
140 {
141  AVCodecParameters *par = os->ctx->streams[0]->codecpar;
142  uint8_t *ptr = par->extradata;
143  int size = par->extradata_size;
144  int i;
145  if (par->codec_id == AV_CODEC_ID_H264) {
146  ff_avc_write_annexb_extradata(ptr, &ptr, &size);
147  if (!ptr)
148  ptr = par->extradata;
149  }
150  if (!ptr)
151  return;
152  os->private_str = av_mallocz(2*size + 1);
153  if (!os->private_str)
154  goto fail;
155  for (i = 0; i < size; i++)
156  snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);
157 fail:
158  if (ptr != par->extradata)
159  av_free(ptr);
160 }
161 
163 {
164  SmoothStreamingContext *c = s->priv_data;
165  int i, j;
166  if (!c->streams)
167  return;
168  for (i = 0; i < s->nb_streams; i++) {
169  OutputStream *os = &c->streams[i];
170  ffurl_closep(&os->out);
171  ffurl_closep(&os->out2);
172  ffurl_closep(&os->tail_out);
173  if (os->ctx && os->ctx->pb)
174  avio_context_free(&os->ctx->pb);
176  av_freep(&os->private_str);
177  for (j = 0; j < os->nb_fragments; j++)
178  av_freep(&os->fragments[j]);
179  av_freep(&os->fragments);
180  }
181  av_freep(&c->streams);
182 }
183 
184 static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
185 {
186  int removed = 0, i, start = 0;
187  if (os->nb_fragments <= 0)
188  return;
189  if (os->fragments[0]->n > 0)
190  removed = 1;
191  if (final)
192  skip = 0;
193  if (window_size)
194  start = FFMAX(os->nb_fragments - skip - window_size, 0);
195  for (i = start; i < os->nb_fragments - skip; i++) {
196  Fragment *frag = os->fragments[i];
197  if (!final || removed)
198  avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);
199  else
200  avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);
201  }
202 }
203 
204 static int write_manifest(AVFormatContext *s, int final)
205 {
206  SmoothStreamingContext *c = s->priv_data;
207  AVIOContext *out;
208  char filename[1024], temp_filename[1024];
209  int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
210  int64_t duration = 0;
211 
212  snprintf(filename, sizeof(filename), "%s/Manifest", s->url);
213  snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->url);
214  ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL);
215  if (ret < 0) {
216  av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
217  return ret;
218  }
219  avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
220  for (i = 0; i < s->nb_streams; i++) {
221  OutputStream *os = &c->streams[i];
222  if (os->nb_fragments > 0) {
223  Fragment *last = os->fragments[os->nb_fragments - 1];
224  duration = last->start_time + last->duration;
225  }
226  if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
227  video_chunks = os->nb_fragments;
228  video_streams++;
229  } else {
230  audio_chunks = os->nb_fragments;
231  audio_streams++;
232  }
233  }
234  if (!final) {
235  duration = 0;
236  video_chunks = audio_chunks = 0;
237  }
238  if (c->window_size) {
239  video_chunks = FFMIN(video_chunks, c->window_size);
240  audio_chunks = FFMIN(audio_chunks, c->window_size);
241  }
242  avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
243  if (!final)
244  avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
245  avio_printf(out, ">\n");
246  if (c->has_video) {
247  int last = -1, index = 0;
248  avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
249  for (i = 0; i < s->nb_streams; i++) {
250  OutputStream *os = &c->streams[i];
251  if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
252  continue;
253  last = i;
254  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);
255  index++;
256  }
257  output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
258  avio_printf(out, "</StreamIndex>\n");
259  }
260  if (c->has_audio) {
261  int last = -1, index = 0;
262  avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
263  for (i = 0; i < s->nb_streams; i++) {
264  OutputStream *os = &c->streams[i];
265  if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
266  continue;
267  last = i;
268  avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%"PRId64"\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n",
269  index, s->streams[i]->codecpar->bit_rate, os->fourcc, s->streams[i]->codecpar->sample_rate,
270  s->streams[i]->codecpar->ch_layout.nb_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 
338  ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), 1, os, NULL, ism_write, ism_seek);
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 AVUUID tfxd = {
422  0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
423  0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2
424  };
425  AVUUID uuid;
426  avio_read(in, uuid, 16);
427  if (av_uuid_equal(uuid, tfxd) && 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  .p.name = "smoothstreaming",
643  .p.long_name = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"),
644  .p.audio_codec = AV_CODEC_ID_AAC,
645  .p.video_codec = AV_CODEC_ID_H264,
646  .p.flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
647  .p.priv_class = &ism_class,
648  .priv_data_size = sizeof(SmoothStreamingContext),
652  .deinit = ism_free,
653 };
ffurl_seek
static 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: url.h:222
SmoothStreamingContext::remove_at_exit
int remove_at_exit
Definition: smoothstreamingenc.c:73
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:69
OutputStream::cur_start_pos
int64_t cur_start_pos
Definition: smoothstreamingenc.c:53
AVOutputFormat::name
const char * name
Definition: avformat.h:510
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
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:147
AVUUID
uint8_t AVUUID[AV_UUID_LEN]
Definition: uuid.h:60
out
FILE * out
Definition: movenc.c:55
FFStream::first_dts
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: internal.h:409
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
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:126
AVFormatContext::protocol_blacklist
char * protocol_blacklist
',' separated list of disallowed protocols.
Definition: avformat.h:1769
AV_TIME_BASE_Q
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:264
int64_t
long long int64_t
Definition: coverity.c:34
ffurl_write
static int ffurl_write(URLContext *h, const uint8_t *buf, int size)
Write size bytes from buf to the resource accessed by h.
Definition: url.h:202
OutputStream::packets_written
atomic_uint_least64_t packets_written
Definition: ffmpeg.h:607
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1328
deinit
static void deinit(AVFormatContext *s)
Definition: chromaprint.c:52
SmoothStreamingContext
Definition: smoothstreamingenc.c:67
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, const 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:109
AVOption
AVOption.
Definition: opt.h:357
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
mathematics.h
AVDictionary
Definition: dict.c:34
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
SmoothStreamingContext::extra_window_size
int extra_window_size
Definition: smoothstreamingenc.c:70
OutputStream::nb_fragments
int nb_fragments
Definition: hdsenc.c:55
OutputStream::audio_tag
int audio_tag
Definition: smoothstreamingenc.c:62
SmoothStreamingContext::nb_fragments
int nb_fragments
Definition: smoothstreamingenc.c:76
os_support.h
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:588
get_private_data
static void get_private_data(OutputStream *os)
Definition: smoothstreamingenc.c:139
FFOutputFormat::p
AVOutputFormat p
The public AVOutputFormat.
Definition: mux.h:65
Fragment
Definition: hdsenc.c:39
AVFormatContext::interrupt_callback
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1533
OutputStream::stream_type_tag
const char * stream_type_tag
Definition: smoothstreamingenc.c:55
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:419
fail
#define fail()
Definition: checkasm.h:186
Fragment::file
char file[1024]
Definition: hdsenc.c:40
SmoothStreamingContext::has_audio
int has_audio
Definition: smoothstreamingenc.c:75
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:494
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:861
OutputStream::tail_out
URLContext * tail_out
Definition: smoothstreamingenc.c:52
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:761
pkt
AVPacket * pkt
Definition: movenc.c:60
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:69
duration
int64_t duration
Definition: movenc.c:65
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:362
OFFSET
#define OFFSET(x)
Definition: smoothstreamingenc.c:622
Fragment::start_pos
int64_t start_pos
Definition: smoothstreamingenc.c:43
s
#define s(width, name)
Definition: cbs_vp9.c:198
AV_CODEC_ID_WMAPRO
@ AV_CODEC_ID_WMAPRO
Definition: codec_id.h:477
bitrate
int64_t bitrate
Definition: av1_levels.c:47
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:246
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:618
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:49
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:142
ism_seek
static int64_t ism_seek(void *opaque, int64_t offset, int whence)
Definition: smoothstreamingenc.c:92
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:79
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:487
avio_flush
void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:223
AVFormatContext
Format I/O context.
Definition: avformat.h:1260
internal.h
opts
AVDictionary * opts
Definition: movenc.c:51
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:771
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:787
NULL
#define NULL
Definition: coverity.c:32
OutputStream::dirname
char dirname[1024]
Definition: smoothstreamingenc.c:63
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:101
AVFormatContext::protocol_whitelist
char * protocol_whitelist
',' separated list of allowed protocols.
Definition: avformat.h:1762
ff_copy_whiteblacklists
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: avformat.c:900
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
avio_rb64
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:908
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1302
avc.h
FFOutputFormat
Definition: mux.h:61
av_write_frame
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file.
Definition: mux.c:1233
Fragment::duration
int64_t duration
Definition: hdsenc.c:41
index
int index
Definition: gxfenc.c:90
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:162
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:73
AV_CODEC_ID_AAC
@ AV_CODEC_ID_AAC
Definition: codec_id.h:442
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:730
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
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:94
avformat_alloc_context
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:161
FFStream
Definition: internal.h:193
start_time
static int64_t start_time
Definition: ffplay.c:326
uuid.h
Fragment::size
int64_t size
Definition: smoothstreamingenc.c:43
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:468
ff_format_io_close
int ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: avformat.c:946
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:826
SmoothStreamingContext::min_frag_duration
int min_frag_duration
Definition: smoothstreamingenc.c:72
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:532
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:201
av_reallocp_array
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
Allocate, reallocate an array through a pointer to a pointer.
Definition: mem.c:225
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:59
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:539
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:223
write_manifest
static int write_manifest(AVFormatContext *s, int final)
Definition: smoothstreamingenc.c:204
OutputStream::private_str
char * private_str
Definition: smoothstreamingenc.c:60
SmoothStreamingContext::lookahead_count
int lookahead_count
Definition: smoothstreamingenc.c:71
av_uuid_equal
static int av_uuid_equal(const AVUUID uu1, const AVUUID uu2)
Compares two UUIDs for equality.
Definition: uuid.h:119
URLContext
Definition: url.h:35
AVFMT_GLOBALHEADER
#define AVFMT_GLOBALHEADER
Format wants global header.
Definition: avformat.h:478
AVOutputFormat
Definition: avformat.h:509
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
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:191
OutputStream::tail_pos
int64_t tail_pos
Definition: smoothstreamingenc.c:53
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
url.h
OutputStream::ctx
AVFormatContext * ctx
Definition: dashenc.c:107
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:256
AV_CODEC_ID_VC1
@ AV_CODEC_ID_VC1
Definition: codec_id.h:122
len
int len
Definition: vorbis_enc_data.h:426
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:264
write_packet
static int write_packet(Muxer *mux, OutputStream *ost, AVPacket *pkt)
Definition: ffmpeg_mux.c:209
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:588
tag
uint32_t tag
Definition: movenc.c:1876
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:748
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:231
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:1279
SmoothStreamingContext::streams
OutputStream * streams
Definition: smoothstreamingenc.c:74
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:50
ff_avc_write_annexb_extradata
int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size)
Definition: avc.c:144
OutputStream::iobuf
uint8_t iobuf[32768]
Definition: hdsenc.c:50
ism_write
static int ism_write(void *opaque, const uint8_t *buf, int buf_size)
Definition: smoothstreamingenc.c:79
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:245
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: avformat.c:141
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:612
output_chunk_list
static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
Definition: smoothstreamingenc.c:184
AVPacket::stream_index
int stream_index
Definition: packet.h:535
OutputStream::out
AVIOContext * out
Definition: dashenc.c:109
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:167
AVIO_FLAG_READ
#define AVIO_FLAG_READ
read-only
Definition: avio.h:617
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:79
mem.h
OutputStream::out2
URLContext * out2
Definition: smoothstreamingenc.c:51
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:510
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:261
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
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:88
OutputStream::cur_pos
int64_t cur_pos
Definition: smoothstreamingenc.c:53
OutputStream
Definition: mux.c:53
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:85
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
OutputStream::packet_size
int packet_size
Definition: smoothstreamingenc.c:61
avstring.h
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:345
snprintf
#define snprintf
Definition: snprintf.h:34
Fragment::n
int n
Definition: hdsenc.c:42
SmoothStreamingContext::has_video
int has_video
Definition: smoothstreamingenc.c:75
skip
static void BS_FUNC() skip(BSCTX *bc, unsigned int n)
Skip n bits in the buffer.
Definition: bitstream_template.h:375
Fragment::infofile
char infofile[1024]
Definition: smoothstreamingenc.c:45
ff_smoothstreaming_muxer
const FFOutputFormat ff_smoothstreaming_muxer
Definition: smoothstreamingenc.c:641
avcodec_parameters_copy
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: codec_par.c:106
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
mux.h
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:1394