FFmpeg  1.2.12
mpegtsenc.c
Go to the documentation of this file.
1 /*
2  * MPEG2 transport stream (aka DVB) muxer
3  * Copyright (c) 2003 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/bswap.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/dict.h"
25 #include "libavutil/mathematics.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/avassert.h"
28 #include "libavcodec/mpegvideo.h"
29 #include "avformat.h"
30 #include "internal.h"
31 #include "mpegts.h"
32 
33 #define PCR_TIME_BASE 27000000
34 
35 /* write DVB SI sections */
36 
37 /*********************************************/
38 /* mpegts section writer */
39 
40 typedef struct MpegTSSection {
41  int pid;
42  int cc;
43  void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
44  void *opaque;
46 
47 typedef struct MpegTSService {
48  MpegTSSection pmt; /* MPEG2 pmt table context */
49  int sid; /* service ID */
50  char *name;
52  int pcr_pid;
56 
57 typedef struct MpegTSWrite {
58  const AVClass *av_class;
59  MpegTSSection pat; /* MPEG2 pat table */
60  MpegTSSection sdt; /* MPEG2 sdt table context */
67  int onid;
68  int tsid;
69  int64_t first_pcr;
70  int mux_rate;
72 
76 
78  int start_pid;
79  int m2ts_mode;
80 
81  int reemit_pat_pmt; // backward compatibility
82 
83 #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
84 #define MPEGTS_FLAG_AAC_LATM 0x02
85  int flags;
86  int copyts;
87 } MpegTSWrite;
88 
89 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
90 #define DEFAULT_PES_HEADER_FREQ 16
91 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
92 
93 static const AVOption options[] = {
94  { "mpegts_transport_stream_id", "Set transport_stream_id field.",
95  offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
96  { "mpegts_original_network_id", "Set original_network_id field.",
97  offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
98  { "mpegts_service_id", "Set service_id field.",
99  offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
100  { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
101  offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x0010, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
102  { "mpegts_start_pid", "Set the first pid.",
103  offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
104  {"mpegts_m2ts_mode", "Enable m2ts mode.",
105  offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.i64 = -1 },
107  { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
108  { "pes_payload_size", "Minimum PES packet payload in bytes",
109  offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {.i64 = DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
110  { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX,
111  AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
112  { "resend_headers", "Reemit PAT/PMT before writing the next packet",
113  0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX,
114  AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
115  { "latm", "Use LATM packetization for AAC",
116  0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX,
117  AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
118  // backward compatibility
119  { "resend_headers", "Reemit PAT/PMT before writing the next packet",
120  offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
121  { "mpegts_copyts", "dont offset dts/pts",
122  offsetof(MpegTSWrite, copyts), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},
123  { NULL },
124 };
125 
126 static const AVClass mpegts_muxer_class = {
127  .class_name = "MPEGTS muxer",
128  .item_name = av_default_item_name,
129  .option = options,
130  .version = LIBAVUTIL_VERSION_INT,
131 };
132 
133 /* NOTE: 4 bytes must be left at the end for the crc32 */
134 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
135 {
136  unsigned int crc;
137  unsigned char packet[TS_PACKET_SIZE];
138  const unsigned char *buf_ptr;
139  unsigned char *q;
140  int first, b, len1, left;
141 
142  crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
143  buf[len - 4] = (crc >> 24) & 0xff;
144  buf[len - 3] = (crc >> 16) & 0xff;
145  buf[len - 2] = (crc >> 8) & 0xff;
146  buf[len - 1] = (crc) & 0xff;
147 
148  /* send each packet */
149  buf_ptr = buf;
150  while (len > 0) {
151  first = (buf == buf_ptr);
152  q = packet;
153  *q++ = 0x47;
154  b = (s->pid >> 8);
155  if (first)
156  b |= 0x40;
157  *q++ = b;
158  *q++ = s->pid;
159  s->cc = (s->cc + 1) & 0xf;
160  *q++ = 0x10 | s->cc;
161  if (first)
162  *q++ = 0; /* 0 offset */
163  len1 = TS_PACKET_SIZE - (q - packet);
164  if (len1 > len)
165  len1 = len;
166  memcpy(q, buf_ptr, len1);
167  q += len1;
168  /* add known padding data */
169  left = TS_PACKET_SIZE - (q - packet);
170  if (left > 0)
171  memset(q, 0xff, left);
172 
173  s->write_packet(s, packet);
174 
175  buf_ptr += len1;
176  len -= len1;
177  }
178 }
179 
180 static inline void put16(uint8_t **q_ptr, int val)
181 {
182  uint8_t *q;
183  q = *q_ptr;
184  *q++ = val >> 8;
185  *q++ = val;
186  *q_ptr = q;
187 }
188 
189 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
190  int version, int sec_num, int last_sec_num,
191  uint8_t *buf, int len)
192 {
193  uint8_t section[1024], *q;
194  unsigned int tot_len;
195  /* reserved_future_use field must be set to 1 for SDT */
196  unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
197 
198  tot_len = 3 + 5 + len + 4;
199  /* check if not too big */
200  if (tot_len > 1024)
201  return AVERROR_INVALIDDATA;
202 
203  q = section;
204  *q++ = tid;
205  put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
206  put16(&q, id);
207  *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
208  *q++ = sec_num;
209  *q++ = last_sec_num;
210  memcpy(q, buf, len);
211 
212  mpegts_write_section(s, section, tot_len);
213  return 0;
214 }
215 
216 /*********************************************/
217 /* mpegts writer */
218 
219 #define DEFAULT_PROVIDER_NAME "FFmpeg"
220 #define DEFAULT_SERVICE_NAME "Service01"
221 
222 /* we retransmit the SI info at this rate */
223 #define SDT_RETRANS_TIME 500
224 #define PAT_RETRANS_TIME 100
225 #define PCR_RETRANS_TIME 20
226 
227 typedef struct MpegTSWriteStream {
229  int pid; /* stream associated pid */
230  int cc;
234  int64_t payload_pts;
235  int64_t payload_dts;
240 
242 {
243  MpegTSWrite *ts = s->priv_data;
244  MpegTSService *service;
245  uint8_t data[1012], *q;
246  int i;
247 
248  q = data;
249  for(i = 0; i < ts->nb_services; i++) {
250  service = ts->services[i];
251  put16(&q, service->sid);
252  put16(&q, 0xe000 | service->pmt.pid);
253  }
254  mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
255  data, q - data);
256 }
257 
259 {
260  MpegTSWrite *ts = s->priv_data;
261  uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
262  int val, stream_type, i;
263 
264  q = data;
265  put16(&q, 0xe000 | service->pcr_pid);
266 
267  program_info_length_ptr = q;
268  q += 2; /* patched after */
269 
270  /* put program info here */
271 
272  val = 0xf000 | (q - program_info_length_ptr - 2);
273  program_info_length_ptr[0] = val >> 8;
274  program_info_length_ptr[1] = val;
275 
276  for(i = 0; i < s->nb_streams; i++) {
277  AVStream *st = s->streams[i];
278  MpegTSWriteStream *ts_st = st->priv_data;
279  AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
280  switch(st->codec->codec_id) {
283  stream_type = STREAM_TYPE_VIDEO_MPEG2;
284  break;
285  case AV_CODEC_ID_MPEG4:
286  stream_type = STREAM_TYPE_VIDEO_MPEG4;
287  break;
288  case AV_CODEC_ID_H264:
289  stream_type = STREAM_TYPE_VIDEO_H264;
290  break;
291  case AV_CODEC_ID_DIRAC:
292  stream_type = STREAM_TYPE_VIDEO_DIRAC;
293  break;
294  case AV_CODEC_ID_MP2:
295  case AV_CODEC_ID_MP3:
296  stream_type = STREAM_TYPE_AUDIO_MPEG1;
297  break;
298  case AV_CODEC_ID_AAC:
300  break;
302  stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
303  break;
304  case AV_CODEC_ID_AC3:
305  stream_type = STREAM_TYPE_AUDIO_AC3;
306  break;
307  default:
308  stream_type = STREAM_TYPE_PRIVATE_DATA;
309  break;
310  }
311 
312  if (q - data > sizeof(data) - 32)
313  return AVERROR(EINVAL);
314 
315  *q++ = stream_type;
316  put16(&q, 0xe000 | ts_st->pid);
317  desc_length_ptr = q;
318  q += 2; /* patched after */
319 
320  /* write optional descriptors here */
321  switch(st->codec->codec_type) {
322  case AVMEDIA_TYPE_AUDIO:
323  if(st->codec->codec_id==AV_CODEC_ID_EAC3){
324  *q++=0x7a; // EAC3 descriptor see A038 DVB SI
325  *q++=1; // 1 byte, all flags sets to 0
326  *q++=0; // omit all fields...
327  }
328  if(st->codec->codec_id==AV_CODEC_ID_S302M){
329  *q++ = 0x05; /* MPEG-2 registration descriptor*/
330  *q++ = 4;
331  *q++ = 'B';
332  *q++ = 'S';
333  *q++ = 'S';
334  *q++ = 'D';
335  }
336 
337  if (lang) {
338  char *p;
339  char *next = lang->value;
340  uint8_t *len_ptr;
341 
342  *q++ = 0x0a; /* ISO 639 language descriptor */
343  len_ptr = q++;
344  *len_ptr = 0;
345 
346  for (p = lang->value; next && *len_ptr < 255 / 4 * 4 && q - data < sizeof(data) - 4; p = next + 1) {
347  next = strchr(p, ',');
348  if (strlen(p) != 3 && (!next || next != p + 3))
349  continue; /* not a 3-letter code */
350 
351  *q++ = *p++;
352  *q++ = *p++;
353  *q++ = *p++;
354 
356  *q++ = 0x01;
358  *q++ = 0x02;
360  *q++ = 0x03;
361  else
362  *q++ = 0; /* undefined type */
363 
364  *len_ptr += 4;
365  }
366 
367  if (*len_ptr == 0)
368  q -= 2; /* no language codes were written */
369  }
370  break;
372  {
373  const char *language;
374  language = lang && strlen(lang->value)==3 ? lang->value : "eng";
375  *q++ = 0x59;
376  *q++ = 8;
377  *q++ = language[0];
378  *q++ = language[1];
379  *q++ = language[2];
380  *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
381  if(st->codec->extradata_size == 4) {
382  memcpy(q, st->codec->extradata, 4);
383  q += 4;
384  } else {
385  put16(&q, 1); /* page id */
386  put16(&q, 1); /* ancillary page id */
387  }
388  }
389  break;
390  case AVMEDIA_TYPE_VIDEO:
391  if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
392  *q++ = 0x05; /*MPEG-2 registration descriptor*/
393  *q++ = 4;
394  *q++ = 'd';
395  *q++ = 'r';
396  *q++ = 'a';
397  *q++ = 'c';
398  }
399  break;
400  }
401 
402  val = 0xf000 | (q - desc_length_ptr - 2);
403  desc_length_ptr[0] = val >> 8;
404  desc_length_ptr[1] = val;
405  }
406  mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
407  data, q - data);
408  return 0;
409 }
410 
411 /* NOTE: str == NULL is accepted for an empty string */
412 static void putstr8(uint8_t **q_ptr, const char *str)
413 {
414  uint8_t *q;
415  int len;
416 
417  q = *q_ptr;
418  if (!str)
419  len = 0;
420  else
421  len = strlen(str);
422  *q++ = len;
423  memcpy(q, str, len);
424  q += len;
425  *q_ptr = q;
426 }
427 
429 {
430  MpegTSWrite *ts = s->priv_data;
431  MpegTSService *service;
432  uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
433  int i, running_status, free_ca_mode, val;
434 
435  q = data;
436  put16(&q, ts->onid);
437  *q++ = 0xff;
438  for(i = 0; i < ts->nb_services; i++) {
439  service = ts->services[i];
440  put16(&q, service->sid);
441  *q++ = 0xfc | 0x00; /* currently no EIT info */
442  desc_list_len_ptr = q;
443  q += 2;
444  running_status = 4; /* running */
445  free_ca_mode = 0;
446 
447  /* write only one descriptor for the service name and provider */
448  *q++ = 0x48;
449  desc_len_ptr = q;
450  q++;
451  *q++ = 0x01; /* digital television service */
452  putstr8(&q, service->provider_name);
453  putstr8(&q, service->name);
454  desc_len_ptr[0] = q - desc_len_ptr - 1;
455 
456  /* fill descriptor length */
457  val = (running_status << 13) | (free_ca_mode << 12) |
458  (q - desc_list_len_ptr - 2);
459  desc_list_len_ptr[0] = val >> 8;
460  desc_list_len_ptr[1] = val;
461  }
462  mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
463  data, q - data);
464 }
465 
467  int sid,
468  const char *provider_name,
469  const char *name)
470 {
471  MpegTSService *service;
472 
473  service = av_mallocz(sizeof(MpegTSService));
474  if (!service)
475  return NULL;
476  service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
477  service->sid = sid;
478  service->provider_name = av_strdup(provider_name);
479  service->name = av_strdup(name);
480  service->pcr_pid = 0x1fff;
481  dynarray_add(&ts->services, &ts->nb_services, service);
482  return service;
483 }
484 
485 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
486 {
487  return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
488  ts->first_pcr;
489 }
490 
492 {
493  MpegTSWrite *ts = s->priv_data;
494  if (ts->m2ts_mode) {
495  int64_t pcr = get_pcr(s->priv_data, s->pb);
496  uint32_t tp_extra_header = pcr % 0x3fffffff;
497  tp_extra_header = AV_RB32(&tp_extra_header);
498  avio_write(s->pb, (unsigned char *) &tp_extra_header,
499  sizeof(tp_extra_header));
500  }
501 }
502 
503 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
504 {
505  AVFormatContext *ctx = s->opaque;
507  avio_write(ctx->pb, packet, TS_PACKET_SIZE);
508 }
509 
511 {
512  MpegTSWrite *ts = s->priv_data;
513  MpegTSWriteStream *ts_st;
514  MpegTSService *service;
515  AVStream *st, *pcr_st = NULL;
516  AVDictionaryEntry *title, *provider;
517  int i, j;
518  const char *service_name;
519  const char *provider_name;
520  int *pids;
521  int ret;
522 
523  if (s->max_delay < 0) /* Not set by the caller */
524  s->max_delay = 0;
525 
526  // round up to a whole number of TS packets
527  ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
528 
529  ts->tsid = ts->transport_stream_id;
530  ts->onid = ts->original_network_id;
531  /* allocate a single DVB service */
532  title = av_dict_get(s->metadata, "service_name", NULL, 0);
533  if (!title)
534  title = av_dict_get(s->metadata, "title", NULL, 0);
535  service_name = title ? title->value : DEFAULT_SERVICE_NAME;
536  provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
537  provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
538  service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
540  service->pmt.opaque = s;
541  service->pmt.cc = 15;
542 
543  ts->pat.pid = PAT_PID;
544  ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
546  ts->pat.opaque = s;
547 
548  ts->sdt.pid = SDT_PID;
549  ts->sdt.cc = 15;
551  ts->sdt.opaque = s;
552 
553  pids = av_malloc(s->nb_streams * sizeof(*pids));
554  if (!pids)
555  return AVERROR(ENOMEM);
556 
557  /* assign pids to each stream */
558  for(i = 0;i < s->nb_streams; i++) {
559  st = s->streams[i];
560  avpriv_set_pts_info(st, 33, 1, 90000);
561  ts_st = av_mallocz(sizeof(MpegTSWriteStream));
562  if (!ts_st) {
563  ret = AVERROR(ENOMEM);
564  goto fail;
565  }
566  st->priv_data = ts_st;
567  ts_st->payload = av_mallocz(ts->pes_payload_size);
568  if (!ts_st->payload) {
569  ret = AVERROR(ENOMEM);
570  goto fail;
571  }
572  ts_st->service = service;
573  /* MPEG pid values < 16 are reserved. Applications which set st->id in
574  * this range are assigned a calculated pid. */
575  if (st->id < 16) {
576  ts_st->pid = ts->start_pid + i;
577  } else if (st->id < 0x1FFF) {
578  ts_st->pid = st->id;
579  } else {
580  av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
581  ret = AVERROR(EINVAL);
582  goto fail;
583  }
584  if (ts_st->pid == service->pmt.pid) {
585  av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
586  ret = AVERROR(EINVAL);
587  goto fail;
588  }
589  for (j = 0; j < i; j++)
590  if (pids[j] == ts_st->pid) {
591  av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
592  ret = AVERROR(EINVAL);
593  goto fail;
594  }
595  pids[i] = ts_st->pid;
596  ts_st->payload_pts = AV_NOPTS_VALUE;
597  ts_st->payload_dts = AV_NOPTS_VALUE;
598  ts_st->first_pts_check = 1;
599  ts_st->cc = 15;
600  /* update PCR pid by using the first video stream */
601  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
602  service->pcr_pid == 0x1fff) {
603  service->pcr_pid = ts_st->pid;
604  pcr_st = st;
605  }
606  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
607  st->codec->extradata_size > 0)
608  {
609  AVStream *ast;
610  ts_st->amux = avformat_alloc_context();
611  if (!ts_st->amux) {
612  ret = AVERROR(ENOMEM);
613  goto fail;
614  }
615  ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL);
616  if (!ts_st->amux->oformat) {
617  ret = AVERROR(EINVAL);
618  goto fail;
619  }
620  ast = avformat_new_stream(ts_st->amux, NULL);
621  ret = avcodec_copy_context(ast->codec, st->codec);
622  if (ret != 0)
623  goto fail;
624  ret = avformat_write_header(ts_st->amux, NULL);
625  if (ret < 0)
626  goto fail;
627  }
628  }
629 
630  av_free(pids);
631 
632  /* if no video stream, use the first stream as PCR */
633  if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
634  pcr_st = s->streams[0];
635  ts_st = pcr_st->priv_data;
636  service->pcr_pid = ts_st->pid;
637  }
638 
639  if (ts->mux_rate > 1) {
640  service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
641  (TS_PACKET_SIZE * 8 * 1000);
643  (TS_PACKET_SIZE * 8 * 1000);
645  (TS_PACKET_SIZE * 8 * 1000);
646 
647  if(ts->copyts < 1)
649  } else {
650  /* Arbitrary values, PAT/PMT will also be written on video key frames */
651  ts->sdt_packet_period = 200;
652  ts->pat_packet_period = 40;
653  if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
654  if (!pcr_st->codec->frame_size) {
655  av_log(s, AV_LOG_WARNING, "frame size not set\n");
656  service->pcr_packet_period =
657  pcr_st->codec->sample_rate/(10*512);
658  } else {
659  service->pcr_packet_period =
660  pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
661  }
662  } else {
663  // max delta PCR 0.1s
664  service->pcr_packet_period =
665  pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
666  }
667  if(!service->pcr_packet_period)
668  service->pcr_packet_period = 1;
669  }
670 
671  // output a PCR as soon as possible
672  service->pcr_packet_count = service->pcr_packet_period;
675 
676  if (ts->mux_rate == 1)
677  av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");
678  else
679  av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);
680  av_log(s, AV_LOG_VERBOSE, "pcr every %d pkts, "
681  "sdt every %d, pat/pmt every %d pkts\n",
682  service->pcr_packet_period,
684 
685  if (ts->m2ts_mode == -1) {
686  if (av_match_ext(s->filename, "m2ts")) {
687  ts->m2ts_mode = 1;
688  } else {
689  ts->m2ts_mode = 0;
690  }
691  }
692 
693  avio_flush(s->pb);
694 
695  return 0;
696 
697  fail:
698  av_free(pids);
699  for(i = 0;i < s->nb_streams; i++) {
700  MpegTSWriteStream *ts_st;
701  st = s->streams[i];
702  ts_st = st->priv_data;
703  if (ts_st) {
704  av_freep(&ts_st->payload);
705  if (ts_st->amux) {
706  avformat_free_context(ts_st->amux);
707  ts_st->amux = NULL;
708  }
709  }
710  av_freep(&st->priv_data);
711  }
712  return ret;
713 }
714 
715 /* send SDT, PAT and PMT tables regulary */
716 static void retransmit_si_info(AVFormatContext *s, int force_pat)
717 {
718  MpegTSWrite *ts = s->priv_data;
719  int i;
720 
721  if (++ts->sdt_packet_count == ts->sdt_packet_period) {
722  ts->sdt_packet_count = 0;
723  mpegts_write_sdt(s);
724  }
725  if (++ts->pat_packet_count == ts->pat_packet_period || force_pat) {
726  ts->pat_packet_count = 0;
727  mpegts_write_pat(s);
728  for(i = 0; i < ts->nb_services; i++) {
729  mpegts_write_pmt(s, ts->services[i]);
730  }
731  }
732 }
733 
734 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
735 {
736  int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
737 
738  *buf++ = pcr_high >> 25;
739  *buf++ = pcr_high >> 17;
740  *buf++ = pcr_high >> 9;
741  *buf++ = pcr_high >> 1;
742  *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
743  *buf++ = pcr_low;
744 
745  return 6;
746 }
747 
748 /* Write a single null transport stream packet */
750 {
751  uint8_t *q;
752  uint8_t buf[TS_PACKET_SIZE];
753 
754  q = buf;
755  *q++ = 0x47;
756  *q++ = 0x00 | 0x1f;
757  *q++ = 0xff;
758  *q++ = 0x10;
759  memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
761  avio_write(s->pb, buf, TS_PACKET_SIZE);
762 }
763 
764 /* Write a single transport stream packet with a PCR and no payload */
766 {
767  MpegTSWrite *ts = s->priv_data;
768  MpegTSWriteStream *ts_st = st->priv_data;
769  uint8_t *q;
770  uint8_t buf[TS_PACKET_SIZE];
771 
772  q = buf;
773  *q++ = 0x47;
774  *q++ = ts_st->pid >> 8;
775  *q++ = ts_st->pid;
776  *q++ = 0x20 | ts_st->cc; /* Adaptation only */
777  /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
778  *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
779  *q++ = 0x10; /* Adaptation flags: PCR present */
780 
781  /* PCR coded into 6 bytes */
782  q += write_pcr_bits(q, get_pcr(ts, s->pb));
783 
784  /* stuffing bytes */
785  memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
787  avio_write(s->pb, buf, TS_PACKET_SIZE);
788 }
789 
790 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
791 {
792  int val;
793 
794  val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
795  *q++ = val;
796  val = (((pts >> 15) & 0x7fff) << 1) | 1;
797  *q++ = val >> 8;
798  *q++ = val;
799  val = (((pts) & 0x7fff) << 1) | 1;
800  *q++ = val >> 8;
801  *q++ = val;
802 }
803 
804 /* Set an adaptation field flag in an MPEG-TS packet*/
805 static void set_af_flag(uint8_t *pkt, int flag)
806 {
807  // expect at least one flag to set
808  av_assert0(flag);
809 
810  if ((pkt[3] & 0x20) == 0) {
811  // no AF yet, set adaptation field flag
812  pkt[3] |= 0x20;
813  // 1 byte length, no flags
814  pkt[4] = 1;
815  pkt[5] = 0;
816  }
817  pkt[5] |= flag;
818 }
819 
820 /* Extend the adaptation field by size bytes */
821 static void extend_af(uint8_t *pkt, int size)
822 {
823  // expect already existing adaptation field
824  av_assert0(pkt[3] & 0x20);
825  pkt[4] += size;
826 }
827 
828 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
830 {
831  if (pkt[3] & 0x20)
832  return pkt + 5 + pkt[4];
833  else
834  return pkt + 4;
835 }
836 
837 /* Add a pes header to the front of payload, and segment into an integer number of
838  * ts packets. The final ts packet is padded using an over-sized adaptation header
839  * to exactly fill the last ts packet.
840  * NOTE: 'payload' contains a complete PES payload.
841  */
843  const uint8_t *payload, int payload_size,
844  int64_t pts, int64_t dts, int key)
845 {
846  MpegTSWriteStream *ts_st = st->priv_data;
847  MpegTSWrite *ts = s->priv_data;
848  uint8_t buf[TS_PACKET_SIZE];
849  uint8_t *q;
850  int val, is_start, len, header_len, write_pcr, private_code, flags;
851  int afc_len, stuffing_len;
852  int64_t pcr = -1; /* avoid warning */
853  int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
854  int force_pat = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && key && !ts_st->prev_payload_key;
855 
856  is_start = 1;
857  while (payload_size > 0) {
858  retransmit_si_info(s, force_pat);
859  force_pat = 0;
860 
861  write_pcr = 0;
862  if (ts_st->pid == ts_st->service->pcr_pid) {
863  if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
864  ts_st->service->pcr_packet_count++;
865  if (ts_st->service->pcr_packet_count >=
866  ts_st->service->pcr_packet_period) {
867  ts_st->service->pcr_packet_count = 0;
868  write_pcr = 1;
869  }
870  }
871 
872  if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
873  (dts - get_pcr(ts, s->pb)/300) > delay) {
874  /* pcr insert gets priority over null packet insert */
875  if (write_pcr)
876  mpegts_insert_pcr_only(s, st);
877  else
879  continue; /* recalculate write_pcr and possibly retransmit si_info */
880  }
881 
882  /* prepare packet header */
883  q = buf;
884  *q++ = 0x47;
885  val = (ts_st->pid >> 8);
886  if (is_start)
887  val |= 0x40;
888  *q++ = val;
889  *q++ = ts_st->pid;
890  ts_st->cc = (ts_st->cc + 1) & 0xf;
891  *q++ = 0x10 | ts_st->cc; // payload indicator + CC
892  if (key && is_start && pts != AV_NOPTS_VALUE) {
893  // set Random Access for key frames
894  if (ts_st->pid == ts_st->service->pcr_pid)
895  write_pcr = 1;
896  set_af_flag(buf, 0x40);
897  q = get_ts_payload_start(buf);
898  }
899  if (write_pcr) {
900  set_af_flag(buf, 0x10);
901  q = get_ts_payload_start(buf);
902  // add 11, pcr references the last byte of program clock reference base
903  if (ts->mux_rate > 1)
904  pcr = get_pcr(ts, s->pb);
905  else
906  pcr = (dts - delay)*300;
907  if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
908  av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
909  extend_af(buf, write_pcr_bits(q, pcr));
910  q = get_ts_payload_start(buf);
911  }
912  if (is_start) {
913  int pes_extension = 0;
914  /* write PES header */
915  *q++ = 0x00;
916  *q++ = 0x00;
917  *q++ = 0x01;
918  private_code = 0;
919  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
920  if (st->codec->codec_id == AV_CODEC_ID_DIRAC) {
921  *q++ = 0xfd;
922  } else
923  *q++ = 0xe0;
924  } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
925  (st->codec->codec_id == AV_CODEC_ID_MP2 ||
926  st->codec->codec_id == AV_CODEC_ID_MP3 ||
927  st->codec->codec_id == AV_CODEC_ID_AAC)) {
928  *q++ = 0xc0;
929  } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
930  st->codec->codec_id == AV_CODEC_ID_AC3 &&
931  ts->m2ts_mode) {
932  *q++ = 0xfd;
933  } else {
934  *q++ = 0xbd;
935  if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
936  private_code = 0x20;
937  }
938  }
939  header_len = 0;
940  flags = 0;
941  if (pts != AV_NOPTS_VALUE) {
942  header_len += 5;
943  flags |= 0x80;
944  }
945  if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
946  header_len += 5;
947  flags |= 0x40;
948  }
949  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
950  st->codec->codec_id == AV_CODEC_ID_DIRAC) {
951  /* set PES_extension_flag */
952  pes_extension = 1;
953  flags |= 0x01;
954 
955  /*
956  * One byte for PES2 extension flag +
957  * one byte for extension length +
958  * one byte for extension id
959  */
960  header_len += 3;
961  }
962  /* for Blu-ray AC3 Audio the PES Extension flag should be as follow
963  * otherwise it will not play sound on blu-ray
964  */
965  if (ts->m2ts_mode &&
967  st->codec->codec_id == AV_CODEC_ID_AC3) {
968  /* set PES_extension_flag */
969  pes_extension = 1;
970  flags |= 0x01;
971  header_len += 3;
972  }
973  len = payload_size + header_len + 3;
974  if (private_code != 0)
975  len++;
976  if (len > 0xffff)
977  len = 0;
978  *q++ = len >> 8;
979  *q++ = len;
980  val = 0x80;
981  /* data alignment indicator is required for subtitle data */
983  val |= 0x04;
984  *q++ = val;
985  *q++ = flags;
986  *q++ = header_len;
987  if (pts != AV_NOPTS_VALUE) {
988  write_pts(q, flags >> 6, pts);
989  q += 5;
990  }
991  if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
992  write_pts(q, 1, dts);
993  q += 5;
994  }
995  if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {
996  flags = 0x01; /* set PES_extension_flag_2 */
997  *q++ = flags;
998  *q++ = 0x80 | 0x01; /* marker bit + extension length */
999  /*
1000  * Set the stream id extension flag bit to 0 and
1001  * write the extended stream id
1002  */
1003  *q++ = 0x00 | 0x60;
1004  }
1005  /* For Blu-ray AC3 Audio Setting extended flags */
1006  if (ts->m2ts_mode &&
1007  pes_extension &&
1008  st->codec->codec_id == AV_CODEC_ID_AC3) {
1009  flags = 0x01; /* set PES_extension_flag_2 */
1010  *q++ = flags;
1011  *q++ = 0x80 | 0x01; /* marker bit + extension length */
1012  *q++ = 0x00 | 0x71; /* for AC3 Audio (specifically on blue-rays) */
1013  }
1014 
1015 
1016  if (private_code != 0)
1017  *q++ = private_code;
1018  is_start = 0;
1019  }
1020  /* header size */
1021  header_len = q - buf;
1022  /* data len */
1023  len = TS_PACKET_SIZE - header_len;
1024  if (len > payload_size)
1025  len = payload_size;
1026  stuffing_len = TS_PACKET_SIZE - header_len - len;
1027  if (stuffing_len > 0) {
1028  /* add stuffing with AFC */
1029  if (buf[3] & 0x20) {
1030  /* stuffing already present: increase its size */
1031  afc_len = buf[4] + 1;
1032  memmove(buf + 4 + afc_len + stuffing_len,
1033  buf + 4 + afc_len,
1034  header_len - (4 + afc_len));
1035  buf[4] += stuffing_len;
1036  memset(buf + 4 + afc_len, 0xff, stuffing_len);
1037  } else {
1038  /* add stuffing */
1039  memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
1040  buf[3] |= 0x20;
1041  buf[4] = stuffing_len - 1;
1042  if (stuffing_len >= 2) {
1043  buf[5] = 0x00;
1044  memset(buf + 6, 0xff, stuffing_len - 2);
1045  }
1046  }
1047  }
1048  memcpy(buf + TS_PACKET_SIZE - len, payload, len);
1049  payload += len;
1050  payload_size -= len;
1052  avio_write(s->pb, buf, TS_PACKET_SIZE);
1053  }
1054  avio_flush(s->pb);
1055  ts_st->prev_payload_key = key;
1056 }
1057 
1059 {
1060  AVStream *st = s->streams[pkt->stream_index];
1061  int size = pkt->size;
1062  uint8_t *buf= pkt->data;
1063  uint8_t *data= NULL;
1064  MpegTSWrite *ts = s->priv_data;
1065  MpegTSWriteStream *ts_st = st->priv_data;
1066  const int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
1067  int64_t dts = pkt->dts, pts = pkt->pts;
1068 
1069  if (ts->reemit_pat_pmt) {
1070  av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
1071  ts->reemit_pat_pmt = 0;
1073  }
1074 
1075  if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
1076  ts->pat_packet_count = ts->pat_packet_period - 1;
1077  ts->sdt_packet_count = ts->sdt_packet_period - 1;
1079  }
1080 
1081  if(ts->copyts < 1){
1082  if (pts != AV_NOPTS_VALUE)
1083  pts += delay;
1084  if (dts != AV_NOPTS_VALUE)
1085  dts += delay;
1086  }
1087 
1088  if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
1089  av_log(s, AV_LOG_ERROR, "first pts value must be set\n");
1090  return AVERROR_INVALIDDATA;
1091  }
1092  ts_st->first_pts_check = 0;
1093 
1094  if (st->codec->codec_id == AV_CODEC_ID_H264) {
1095  const uint8_t *p = buf, *buf_end = p+size;
1096  uint32_t state = -1;
1097 
1098  if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
1099  av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
1100  "no startcode found, use the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)\n");
1101  return AVERROR(EINVAL);
1102  }
1103 
1104  do {
1105  p = avpriv_mpv_find_start_code(p, buf_end, &state);
1106  av_dlog(s, "nal %d\n", state & 0x1f);
1107  } while (p < buf_end && (state & 0x1f) != 9 &&
1108  (state & 0x1f) != 5 && (state & 0x1f) != 1);
1109 
1110  if ((state & 0x1f) != 9) { // AUD NAL
1111  data = av_malloc(pkt->size+6);
1112  if (!data)
1113  return AVERROR(ENOMEM);
1114  memcpy(data+6, pkt->data, pkt->size);
1115  AV_WB32(data, 0x00000001);
1116  data[4] = 0x09;
1117  data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
1118  buf = data;
1119  size = pkt->size+6;
1120  }
1121  } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {
1122  if (pkt->size < 2) {
1123  av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
1124  return AVERROR_INVALIDDATA;
1125  }
1126  if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
1127  int ret;
1128  AVPacket pkt2;
1129 
1130  if (!ts_st->amux) {
1131  av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
1132  "and extradata missing\n");
1133  return AVERROR_INVALIDDATA;
1134  }
1135 
1136  av_init_packet(&pkt2);
1137  pkt2.data = pkt->data;
1138  pkt2.size = pkt->size;
1139  ret = avio_open_dyn_buf(&ts_st->amux->pb);
1140  if (ret < 0)
1141  return AVERROR(ENOMEM);
1142 
1143  ret = av_write_frame(ts_st->amux, &pkt2);
1144  if (ret < 0) {
1145  avio_close_dyn_buf(ts_st->amux->pb, &data);
1146  ts_st->amux->pb = NULL;
1147  av_free(data);
1148  return ret;
1149  }
1150  size = avio_close_dyn_buf(ts_st->amux->pb, &data);
1151  ts_st->amux->pb = NULL;
1152  buf = data;
1153  }
1154  }
1155 
1156  if (pkt->dts != AV_NOPTS_VALUE) {
1157  int i;
1158  for(i=0; i<s->nb_streams; i++){
1159  AVStream *st2 = s->streams[i];
1160  MpegTSWriteStream *ts_st2 = st2->priv_data;
1161  if( ts_st2->payload_size
1162  && (ts_st2->payload_dts == AV_NOPTS_VALUE || dts - ts_st2->payload_dts > delay/2)){
1163  mpegts_write_pes(s, st2, ts_st2->payload, ts_st2->payload_size,
1164  ts_st2->payload_pts, ts_st2->payload_dts,
1165  ts_st2->payload_flags & AV_PKT_FLAG_KEY);
1166  ts_st2->payload_size = 0;
1167  }
1168  }
1169  }
1170 
1171  if (ts_st->payload_size && ts_st->payload_size + size > ts->pes_payload_size) {
1172  mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1173  ts_st->payload_pts, ts_st->payload_dts,
1174  ts_st->payload_flags & AV_PKT_FLAG_KEY);
1175  ts_st->payload_size = 0;
1176  }
1177 
1178  if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO || size > ts->pes_payload_size) {
1179  av_assert0(!ts_st->payload_size);
1180  // for video and subtitle, write a single pes packet
1181  mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);
1182  av_free(data);
1183  return 0;
1184  }
1185 
1186  if (!ts_st->payload_size) {
1187  ts_st->payload_pts = pts;
1188  ts_st->payload_dts = dts;
1189  ts_st->payload_flags = pkt->flags;
1190  }
1191 
1192  memcpy(ts_st->payload + ts_st->payload_size, buf, size);
1193  ts_st->payload_size += size;
1194 
1195  av_free(data);
1196 
1197  return 0;
1198 }
1199 
1201 {
1202  int i;
1203 
1204  /* flush current packets */
1205  for(i = 0; i < s->nb_streams; i++) {
1206  AVStream *st = s->streams[i];
1207  MpegTSWriteStream *ts_st = st->priv_data;
1208  if (ts_st->payload_size > 0) {
1209  mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1210  ts_st->payload_pts, ts_st->payload_dts,
1211  ts_st->payload_flags & AV_PKT_FLAG_KEY);
1212  ts_st->payload_size = 0;
1213  }
1214  }
1215  avio_flush(s->pb);
1216 }
1217 
1219 {
1220  if (!pkt) {
1221  mpegts_write_flush(s);
1222  return 1;
1223  } else {
1224  return mpegts_write_packet_internal(s, pkt);
1225  }
1226 }
1227 
1229 {
1230  MpegTSWrite *ts = s->priv_data;
1231  MpegTSService *service;
1232  int i;
1233 
1234  mpegts_write_flush(s);
1235 
1236  for(i = 0; i < s->nb_streams; i++) {
1237  AVStream *st = s->streams[i];
1238  MpegTSWriteStream *ts_st = st->priv_data;
1239  av_freep(&ts_st->payload);
1240  if (ts_st->amux) {
1241  avformat_free_context(ts_st->amux);
1242  ts_st->amux = NULL;
1243  }
1244  }
1245 
1246  for(i = 0; i < ts->nb_services; i++) {
1247  service = ts->services[i];
1248  av_freep(&service->provider_name);
1249  av_freep(&service->name);
1250  av_free(service);
1251  }
1252  av_free(ts->services);
1253 
1254  return 0;
1255 }
1256 
1258  .name = "mpegts",
1259  .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
1260  .mime_type = "video/x-mpegts",
1261  .extensions = "ts,m2t,m2ts,mts",
1262  .priv_data_size = sizeof(MpegTSWrite),
1263  .audio_codec = AV_CODEC_ID_MP2,
1264  .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1269  .priv_class = &mpegts_muxer_class,
1270 };