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mpegts.c
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1 /*
2  * MPEG2 transport stream (aka DVB) demuxer
3  * Copyright (c) 2002-2003 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/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/internal.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/mathematics.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/avassert.h"
31 #include "libavcodec/bytestream.h"
32 #include "libavcodec/get_bits.h"
33 #include "libavcodec/opus.h"
34 #include "avformat.h"
35 #include "mpegts.h"
36 #include "internal.h"
37 #include "avio_internal.h"
38 #include "mpeg.h"
39 #include "isom.h"
40 
41 /* maximum size in which we look for synchronisation if
42  * synchronisation is lost */
43 #define MAX_RESYNC_SIZE 65536
44 
45 #define MAX_PES_PAYLOAD 200 * 1024
46 
47 #define MAX_MP4_DESCR_COUNT 16
48 
49 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
50  do { \
51  if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
52  (modulus) = (dividend) % (divisor); \
53  (prev_dividend) = (dividend); \
54  } while (0)
55 
60 };
61 
62 typedef struct MpegTSFilter MpegTSFilter;
63 
64 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
65  int is_start, int64_t pos);
66 
67 typedef struct MpegTSPESFilter {
69  void *opaque;
71 
72 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
73 
74 typedef void SetServiceCallback (void *opaque, int ret);
75 
76 typedef struct MpegTSSectionFilter {
79  int last_ver;
80  unsigned crc;
81  unsigned last_crc;
83  unsigned int check_crc : 1;
84  unsigned int end_of_section_reached : 1;
86  void *opaque;
88 
89 struct MpegTSFilter {
90  int pid;
91  int es_id;
92  int last_cc; /* last cc code (-1 if first packet) */
93  int64_t last_pcr;
95  union {
98  } u;
99 };
100 
101 #define MAX_PIDS_PER_PROGRAM 64
102 struct Program {
103  unsigned int id; // program id/service id
104  unsigned int nb_pids;
105  unsigned int pids[MAX_PIDS_PER_PROGRAM];
106 
107  /** have we found pmt for this program */
109 };
110 
112  const AVClass *class;
113  /* user data */
115  /** raw packet size, including FEC if present */
117 
118  int size_stat[3];
120 #define SIZE_STAT_THRESHOLD 10
121 
122  int64_t pos47_full;
123 
124  /** if true, all pids are analyzed to find streams */
126 
127  /** compute exact PCR for each transport stream packet */
129 
130  /** fix dvb teletext pts */
132 
133  int64_t cur_pcr; /**< used to estimate the exact PCR */
134  int pcr_incr; /**< used to estimate the exact PCR */
135 
136  /* data needed to handle file based ts */
137  /** stop parsing loop */
139  /** packet containing Audio/Video data */
141  /** to detect seek */
142  int64_t last_pos;
143 
146 
148 
150 
151  /******************************************/
152  /* private mpegts data */
153  /* scan context */
154  /** structure to keep track of Program->pids mapping */
155  unsigned int nb_prg;
156  struct Program *prg;
157 
159  /** filters for various streams specified by PMT + for the PAT and PMT */
162 };
163 
164 #define MPEGTS_OPTIONS \
165  { "resync_size", "set size limit for looking up a new synchronization", offsetof(MpegTSContext, resync_size), AV_OPT_TYPE_INT, { .i64 = MAX_RESYNC_SIZE}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }
166 
167 static const AVOption options[] = {
169  {"fix_teletext_pts", "try to fix pts values of dvb teletext streams", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_BOOL,
170  {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
171  {"ts_packetsize", "output option carrying the raw packet size", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
173  {"scan_all_pmts", "scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_BOOL,
174  { .i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
175  {"skip_changes", "skip changing / adding streams / programs", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_BOOL,
176  {.i64 = 0}, 0, 1, 0 },
177  {"skip_clear", "skip clearing programs", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_BOOL,
178  {.i64 = 0}, 0, 1, 0 },
179  { NULL },
180 };
181 
182 static const AVClass mpegts_class = {
183  .class_name = "mpegts demuxer",
184  .item_name = av_default_item_name,
185  .option = options,
186  .version = LIBAVUTIL_VERSION_INT,
187 };
188 
189 static const AVOption raw_options[] = {
191  { "compute_pcr", "compute exact PCR for each transport stream packet",
192  offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_BOOL,
193  { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
194  { "ts_packetsize", "output option carrying the raw packet size",
195  offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
196  { .i64 = 0 }, 0, 0,
198  { NULL },
199 };
200 
201 static const AVClass mpegtsraw_class = {
202  .class_name = "mpegtsraw demuxer",
203  .item_name = av_default_item_name,
204  .option = raw_options,
205  .version = LIBAVUTIL_VERSION_INT,
206 };
207 
208 /* TS stream handling */
209 
216 };
217 
218 /* enough for PES header + length */
219 #define PES_START_SIZE 6
220 #define PES_HEADER_SIZE 9
221 #define MAX_PES_HEADER_SIZE (9 + 255)
222 
223 typedef struct PESContext {
224  int pid;
225  int pcr_pid; /**< if -1 then all packets containing PCR are considered */
230  AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
232  /* used to get the format */
234  int flags; /**< copied to the AVPacket flags */
239  int64_t pts, dts;
240  int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
244 } PESContext;
245 
247 
248 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
249 {
250  int i;
251  for (i = 0; i < ts->nb_prg; i++) {
252  if (ts->prg[i].id == programid) {
253  return &ts->prg[i];
254  }
255  }
256  return NULL;
257 }
258 
259 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
260 {
261  AVProgram *prg = NULL;
262  int i;
263 
264  for (i = 0; i < ts->stream->nb_programs; i++)
265  if (ts->stream->programs[i]->id == programid) {
266  prg = ts->stream->programs[i];
267  break;
268  }
269  if (!prg)
270  return;
271  prg->nb_stream_indexes = 0;
272 }
273 
274 static void clear_program(MpegTSContext *ts, unsigned int programid)
275 {
276  int i;
277 
278  clear_avprogram(ts, programid);
279  for (i = 0; i < ts->nb_prg; i++)
280  if (ts->prg[i].id == programid) {
281  ts->prg[i].nb_pids = 0;
282  ts->prg[i].pmt_found = 0;
283  }
284 }
285 
287 {
288  av_freep(&ts->prg);
289  ts->nb_prg = 0;
290 }
291 
292 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
293 {
294  struct Program *p;
295  if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
296  ts->nb_prg = 0;
297  return;
298  }
299  p = &ts->prg[ts->nb_prg];
300  p->id = programid;
301  p->nb_pids = 0;
302  p->pmt_found = 0;
303  ts->nb_prg++;
304 }
305 
306 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
307  unsigned int pid)
308 {
309  struct Program *p = get_program(ts, programid);
310  int i;
311  if (!p)
312  return;
313 
314  if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
315  return;
316 
317  for (i = 0; i < p->nb_pids; i++)
318  if (p->pids[i] == pid)
319  return;
320 
321  p->pids[p->nb_pids++] = pid;
322 }
323 
324 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
325 {
326  struct Program *p = get_program(ts, programid);
327  if (!p)
328  return;
329 
330  p->pmt_found = 1;
331 }
332 
333 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
334 {
335  int i;
336  for (i = 0; i < s->nb_programs; i++) {
337  if (s->programs[i]->id == programid) {
338  s->programs[i]->pcr_pid = pid;
339  break;
340  }
341  }
342 }
343 
344 /**
345  * @brief discard_pid() decides if the pid is to be discarded according
346  * to caller's programs selection
347  * @param ts : - TS context
348  * @param pid : - pid
349  * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
350  * 0 otherwise
351  */
352 static int discard_pid(MpegTSContext *ts, unsigned int pid)
353 {
354  int i, j, k;
355  int used = 0, discarded = 0;
356  struct Program *p;
357 
358  /* If none of the programs have .discard=AVDISCARD_ALL then there's
359  * no way we have to discard this packet */
360  for (k = 0; k < ts->stream->nb_programs; k++)
361  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
362  break;
363  if (k == ts->stream->nb_programs)
364  return 0;
365 
366  for (i = 0; i < ts->nb_prg; i++) {
367  p = &ts->prg[i];
368  for (j = 0; j < p->nb_pids; j++) {
369  if (p->pids[j] != pid)
370  continue;
371  // is program with id p->id set to be discarded?
372  for (k = 0; k < ts->stream->nb_programs; k++) {
373  if (ts->stream->programs[k]->id == p->id) {
374  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
375  discarded++;
376  else
377  used++;
378  }
379  }
380  }
381  }
382 
383  return !used && discarded;
384 }
385 
386 /**
387  * Assemble PES packets out of TS packets, and then call the "section_cb"
388  * function when they are complete.
389  */
391  const uint8_t *buf, int buf_size, int is_start)
392 {
393  MpegTSSectionFilter *tss = &tss1->u.section_filter;
394  int len;
395 
396  if (is_start) {
397  memcpy(tss->section_buf, buf, buf_size);
398  tss->section_index = buf_size;
399  tss->section_h_size = -1;
400  tss->end_of_section_reached = 0;
401  } else {
402  if (tss->end_of_section_reached)
403  return;
404  len = 4096 - tss->section_index;
405  if (buf_size < len)
406  len = buf_size;
407  memcpy(tss->section_buf + tss->section_index, buf, len);
408  tss->section_index += len;
409  }
410 
411  /* compute section length if possible */
412  if (tss->section_h_size == -1 && tss->section_index >= 3) {
413  len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
414  if (len > 4096)
415  return;
416  tss->section_h_size = len;
417  }
418 
419  if (tss->section_h_size != -1 &&
420  tss->section_index >= tss->section_h_size) {
421  int crc_valid = 1;
422  tss->end_of_section_reached = 1;
423 
424  if (tss->check_crc) {
425  crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
426  if (tss->section_h_size >= 4)
427  tss->crc = AV_RB32(tss->section_buf + tss->section_h_size - 4);
428 
429  if (crc_valid) {
430  ts->crc_validity[ tss1->pid ] = 100;
431  }else if (ts->crc_validity[ tss1->pid ] > -10) {
432  ts->crc_validity[ tss1->pid ]--;
433  }else
434  crc_valid = 2;
435  }
436  if (crc_valid) {
437  tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
438  if (crc_valid != 1)
439  tss->last_ver = -1;
440  }
441  }
442 }
443 
444 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
445  enum MpegTSFilterType type)
446 {
448 
449  av_log(ts->stream, AV_LOG_TRACE, "Filter: pid=0x%x\n", pid);
450 
451  if (pid >= NB_PID_MAX || ts->pids[pid])
452  return NULL;
453  filter = av_mallocz(sizeof(MpegTSFilter));
454  if (!filter)
455  return NULL;
456  ts->pids[pid] = filter;
457 
458  filter->type = type;
459  filter->pid = pid;
460  filter->es_id = -1;
461  filter->last_cc = -1;
462  filter->last_pcr= -1;
463 
464  return filter;
465 }
466 
468  unsigned int pid,
469  SectionCallback *section_cb,
470  void *opaque,
471  int check_crc)
472 {
474  MpegTSSectionFilter *sec;
475 
476  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
477  return NULL;
478  sec = &filter->u.section_filter;
479  sec->section_cb = section_cb;
480  sec->opaque = opaque;
482  sec->check_crc = check_crc;
483  sec->last_ver = -1;
484 
485  if (!sec->section_buf) {
486  av_free(filter);
487  return NULL;
488  }
489  return filter;
490 }
491 
492 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
493  PESCallback *pes_cb,
494  void *opaque)
495 {
497  MpegTSPESFilter *pes;
498 
499  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
500  return NULL;
501 
502  pes = &filter->u.pes_filter;
503  pes->pes_cb = pes_cb;
504  pes->opaque = opaque;
505  return filter;
506 }
507 
508 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
509 {
510  return mpegts_open_filter(ts, pid, MPEGTS_PCR);
511 }
512 
514 {
515  int pid;
516 
517  pid = filter->pid;
518  if (filter->type == MPEGTS_SECTION)
520  else if (filter->type == MPEGTS_PES) {
521  PESContext *pes = filter->u.pes_filter.opaque;
522  av_buffer_unref(&pes->buffer);
523  /* referenced private data will be freed later in
524  * avformat_close_input */
525  if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
526  av_freep(&filter->u.pes_filter.opaque);
527  }
528  }
529 
530  av_free(filter);
531  ts->pids[pid] = NULL;
532 }
533 
534 static int analyze(const uint8_t *buf, int size, int packet_size,
535  int probe)
536 {
537  int stat[TS_MAX_PACKET_SIZE];
538  int stat_all = 0;
539  int i;
540  int best_score = 0;
541 
542  memset(stat, 0, packet_size * sizeof(*stat));
543 
544  for (i = 0; i < size - 3; i++) {
545  if (buf[i] == 0x47 &&
546  (!probe || (buf[i + 3] & 0x30))) {
547  int x = i % packet_size;
548  stat[x]++;
549  stat_all++;
550  if (stat[x] > best_score) {
551  best_score = stat[x];
552  }
553  }
554  }
555 
556  return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
557 }
558 
559 /* autodetect fec presence. Must have at least 1024 bytes */
560 static int get_packet_size(const uint8_t *buf, int size)
561 {
562  int score, fec_score, dvhs_score;
563 
564  if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
565  return AVERROR_INVALIDDATA;
566 
567  score = analyze(buf, size, TS_PACKET_SIZE, 0);
568  dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, 0);
569  fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, 0);
570  av_log(NULL, AV_LOG_TRACE, "score: %d, dvhs_score: %d, fec_score: %d \n",
571  score, dvhs_score, fec_score);
572 
573  if (score > fec_score && score > dvhs_score)
574  return TS_PACKET_SIZE;
575  else if (dvhs_score > score && dvhs_score > fec_score)
576  return TS_DVHS_PACKET_SIZE;
577  else if (score < fec_score && dvhs_score < fec_score)
578  return TS_FEC_PACKET_SIZE;
579  else
580  return AVERROR_INVALIDDATA;
581 }
582 
583 typedef struct SectionHeader {
585  uint16_t id;
589 } SectionHeader;
590 
592 {
593  if (h->version == tssf->last_ver && tssf->last_crc == tssf->crc)
594  return 1;
595 
596  tssf->last_ver = h->version;
597  tssf->last_crc = tssf->crc;
598 
599  return 0;
600 }
601 
602 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
603 {
604  const uint8_t *p;
605  int c;
606 
607  p = *pp;
608  if (p >= p_end)
609  return AVERROR_INVALIDDATA;
610  c = *p++;
611  *pp = p;
612  return c;
613 }
614 
615 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
616 {
617  const uint8_t *p;
618  int c;
619 
620  p = *pp;
621  if (1 >= p_end - p)
622  return AVERROR_INVALIDDATA;
623  c = AV_RB16(p);
624  p += 2;
625  *pp = p;
626  return c;
627 }
628 
629 /* read and allocate a DVB string preceded by its length */
630 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
631 {
632  int len;
633  const uint8_t *p;
634  char *str;
635 
636  p = *pp;
637  len = get8(&p, p_end);
638  if (len < 0)
639  return NULL;
640  if (len > p_end - p)
641  return NULL;
642  str = av_malloc(len + 1);
643  if (!str)
644  return NULL;
645  memcpy(str, p, len);
646  str[len] = '\0';
647  p += len;
648  *pp = p;
649  return str;
650 }
651 
653  const uint8_t **pp, const uint8_t *p_end)
654 {
655  int val;
656 
657  val = get8(pp, p_end);
658  if (val < 0)
659  return val;
660  h->tid = val;
661  *pp += 2;
662  val = get16(pp, p_end);
663  if (val < 0)
664  return val;
665  h->id = val;
666  val = get8(pp, p_end);
667  if (val < 0)
668  return val;
669  h->version = (val >> 1) & 0x1f;
670  val = get8(pp, p_end);
671  if (val < 0)
672  return val;
673  h->sec_num = val;
674  val = get8(pp, p_end);
675  if (val < 0)
676  return val;
677  h->last_sec_num = val;
678  return 0;
679 }
680 
681 typedef struct StreamType {
682  uint32_t stream_type;
685 } StreamType;
686 
687 static const StreamType ISO_types[] = {
694  /* Makito encoder sets stream type 0x11 for AAC,
695  * so auto-detect LOAS/LATM instead of hardcoding it. */
696 #if !CONFIG_LOAS_DEMUXER
697  { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
698 #endif
706  { 0 },
707 };
708 
709 static const StreamType HDMV_types[] = {
715  { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
716  { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
717  { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
718  { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
721  { 0 },
722 };
723 
724 /* ATSC ? */
725 static const StreamType MISC_types[] = {
728  { 0 },
729 };
730 
731 static const StreamType REGD_types[] = {
732  { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
733  { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
734  { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
735  { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
736  { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
737  { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
738  { MKTAG('E', 'A', 'C', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
739  { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
740  { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
741  { MKTAG('I', 'D', '3', ' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
742  { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
743  { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
744  { 0 },
745 };
746 
747 static const StreamType METADATA_types[] = {
748  { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
749  { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
750  { 0 },
751 };
752 
753 /* descriptor present */
754 static const StreamType DESC_types[] = {
755  { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
756  { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
759  { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
760  { 0 },
761 };
762 
764  uint32_t stream_type,
765  const StreamType *types)
766 {
767  for (; types->stream_type; types++)
768  if (stream_type == types->stream_type) {
769  if (st->codecpar->codec_type != types->codec_type ||
770  st->codecpar->codec_id != types->codec_id) {
771  st->codecpar->codec_type = types->codec_type;
772  st->codecpar->codec_id = types->codec_id;
773  st->internal->need_context_update = 1;
774  }
775  st->request_probe = 0;
776  return;
777  }
778 }
779 
781  uint32_t stream_type, uint32_t prog_reg_desc)
782 {
783  int old_codec_type = st->codecpar->codec_type;
784  int old_codec_id = st->codecpar->codec_id;
785  int old_codec_tag = st->codecpar->codec_tag;
786 
787  if (avcodec_is_open(st->internal->avctx)) {
788  av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, internal codec is open\n");
789  return 0;
790  }
791 
792  avpriv_set_pts_info(st, 33, 1, 90000);
793  st->priv_data = pes;
797  pes->st = st;
798  pes->stream_type = stream_type;
799 
800  av_log(pes->stream, AV_LOG_DEBUG,
801  "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
802  st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
803 
804  st->codecpar->codec_tag = pes->stream_type;
805 
806  mpegts_find_stream_type(st, pes->stream_type, ISO_types);
807  if (pes->stream_type == 4)
808  st->request_probe = 50;
809  if ((prog_reg_desc == AV_RL32("HDMV") ||
810  prog_reg_desc == AV_RL32("HDPR")) &&
812  mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
813  if (pes->stream_type == 0x83) {
814  // HDMV TrueHD streams also contain an AC3 coded version of the
815  // audio track - add a second stream for this
816  AVStream *sub_st;
817  // priv_data cannot be shared between streams
818  PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
819  if (!sub_pes)
820  return AVERROR(ENOMEM);
821  memcpy(sub_pes, pes, sizeof(*sub_pes));
822 
823  sub_st = avformat_new_stream(pes->stream, NULL);
824  if (!sub_st) {
825  av_free(sub_pes);
826  return AVERROR(ENOMEM);
827  }
828 
829  sub_st->id = pes->pid;
830  avpriv_set_pts_info(sub_st, 33, 1, 90000);
831  sub_st->priv_data = sub_pes;
833  sub_st->codecpar->codec_id = AV_CODEC_ID_AC3;
835  sub_pes->sub_st = pes->sub_st = sub_st;
836  }
837  }
838  if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
839  mpegts_find_stream_type(st, pes->stream_type, MISC_types);
840  if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
841  st->codecpar->codec_id = old_codec_id;
842  st->codecpar->codec_type = old_codec_type;
843  }
844  if ((st->codecpar->codec_id == AV_CODEC_ID_NONE ||
845  (st->request_probe > 0 && st->request_probe < AVPROBE_SCORE_STREAM_RETRY / 5)) &&
846  st->probe_packets > 0 &&
847  stream_type == STREAM_TYPE_PRIVATE_DATA) {
851  }
852 
853  /* queue a context update if properties changed */
854  if (old_codec_type != st->codecpar->codec_type ||
855  old_codec_id != st->codecpar->codec_id ||
856  old_codec_tag != st->codecpar->codec_tag)
857  st->internal->need_context_update = 1;
858 
859  return 0;
860 }
861 
863 {
864  pes->pts = AV_NOPTS_VALUE;
865  pes->dts = AV_NOPTS_VALUE;
866  pes->data_index = 0;
867  pes->flags = 0;
868  av_buffer_unref(&pes->buffer);
869 }
870 
872 {
873  char *sd;
874 
875  av_init_packet(pkt);
876 
877  pkt->buf = pes->buffer;
878  pkt->data = pes->buffer->data;
879  pkt->size = pes->data_index;
880 
881  if (pes->total_size != MAX_PES_PAYLOAD &&
882  pes->pes_header_size + pes->data_index != pes->total_size +
883  PES_START_SIZE) {
884  av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
885  pes->flags |= AV_PKT_FLAG_CORRUPT;
886  }
887  memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
888 
889  // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
890  if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
891  pkt->stream_index = pes->sub_st->index;
892  else
893  pkt->stream_index = pes->st->index;
894  pkt->pts = pes->pts;
895  pkt->dts = pes->dts;
896  /* store position of first TS packet of this PES packet */
897  pkt->pos = pes->ts_packet_pos;
898  pkt->flags = pes->flags;
899 
900  pes->buffer = NULL;
902 
904  if (!sd)
905  return AVERROR(ENOMEM);
906  *sd = pes->stream_id;
907 
908  return 0;
909 }
910 
911 static uint64_t get_ts64(GetBitContext *gb, int bits)
912 {
913  if (get_bits_left(gb) < bits)
914  return AV_NOPTS_VALUE;
915  return get_bits64(gb, bits);
916 }
917 
919  const uint8_t *buf, int buf_size)
920 {
921  GetBitContext gb;
922  int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
923  int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
924  int dts_flag = -1, cts_flag = -1;
925  int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
926  uint8_t buf_padded[128 + AV_INPUT_BUFFER_PADDING_SIZE];
927  int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - AV_INPUT_BUFFER_PADDING_SIZE);
928 
929  memcpy(buf_padded, buf, buf_padded_size);
930 
931  init_get_bits(&gb, buf_padded, buf_padded_size * 8);
932 
933  if (sl->use_au_start)
934  au_start_flag = get_bits1(&gb);
935  if (sl->use_au_end)
936  au_end_flag = get_bits1(&gb);
937  if (!sl->use_au_start && !sl->use_au_end)
938  au_start_flag = au_end_flag = 1;
939  if (sl->ocr_len > 0)
940  ocr_flag = get_bits1(&gb);
941  if (sl->use_idle)
942  idle_flag = get_bits1(&gb);
943  if (sl->use_padding)
944  padding_flag = get_bits1(&gb);
945  if (padding_flag)
946  padding_bits = get_bits(&gb, 3);
947 
948  if (!idle_flag && (!padding_flag || padding_bits != 0)) {
949  if (sl->packet_seq_num_len)
951  if (sl->degr_prior_len)
952  if (get_bits1(&gb))
953  skip_bits(&gb, sl->degr_prior_len);
954  if (ocr_flag)
955  skip_bits_long(&gb, sl->ocr_len);
956  if (au_start_flag) {
957  if (sl->use_rand_acc_pt)
958  get_bits1(&gb);
959  if (sl->au_seq_num_len > 0)
960  skip_bits_long(&gb, sl->au_seq_num_len);
961  if (sl->use_timestamps) {
962  dts_flag = get_bits1(&gb);
963  cts_flag = get_bits1(&gb);
964  }
965  }
966  if (sl->inst_bitrate_len)
967  inst_bitrate_flag = get_bits1(&gb);
968  if (dts_flag == 1)
969  dts = get_ts64(&gb, sl->timestamp_len);
970  if (cts_flag == 1)
971  cts = get_ts64(&gb, sl->timestamp_len);
972  if (sl->au_len > 0)
973  skip_bits_long(&gb, sl->au_len);
974  if (inst_bitrate_flag)
976  }
977 
978  if (dts != AV_NOPTS_VALUE)
979  pes->dts = dts;
980  if (cts != AV_NOPTS_VALUE)
981  pes->pts = cts;
982 
983  if (sl->timestamp_len && sl->timestamp_res)
985 
986  return (get_bits_count(&gb) + 7) >> 3;
987 }
988 
989 /* return non zero if a packet could be constructed */
991  const uint8_t *buf, int buf_size, int is_start,
992  int64_t pos)
993 {
994  PESContext *pes = filter->u.pes_filter.opaque;
995  MpegTSContext *ts = pes->ts;
996  const uint8_t *p;
997  int ret, len, code;
998 
999  if (!ts->pkt)
1000  return 0;
1001 
1002  if (is_start) {
1003  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1004  ret = new_pes_packet(pes, ts->pkt);
1005  if (ret < 0)
1006  return ret;
1007  ts->stop_parse = 1;
1008  } else {
1010  }
1011  pes->state = MPEGTS_HEADER;
1012  pes->ts_packet_pos = pos;
1013  }
1014  p = buf;
1015  while (buf_size > 0) {
1016  switch (pes->state) {
1017  case MPEGTS_HEADER:
1018  len = PES_START_SIZE - pes->data_index;
1019  if (len > buf_size)
1020  len = buf_size;
1021  memcpy(pes->header + pes->data_index, p, len);
1022  pes->data_index += len;
1023  p += len;
1024  buf_size -= len;
1025  if (pes->data_index == PES_START_SIZE) {
1026  /* we got all the PES or section header. We can now
1027  * decide */
1028  if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
1029  pes->header[2] == 0x01) {
1030  /* it must be an mpeg2 PES stream */
1031  code = pes->header[3] | 0x100;
1032  av_log(pes->stream, AV_LOG_TRACE, "pid=%x pes_code=%#x\n", pes->pid,
1033  code);
1034  pes->stream_id = pes->header[3];
1035 
1036  if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
1037  (!pes->sub_st ||
1038  pes->sub_st->discard == AVDISCARD_ALL)) ||
1039  code == 0x1be) /* padding_stream */
1040  goto skip;
1041 
1042  /* stream not present in PMT */
1043  if (!pes->st) {
1044  if (ts->skip_changes)
1045  goto skip;
1046 
1047  pes->st = avformat_new_stream(ts->stream, NULL);
1048  if (!pes->st)
1049  return AVERROR(ENOMEM);
1050  pes->st->id = pes->pid;
1051  mpegts_set_stream_info(pes->st, pes, 0, 0);
1052  }
1053 
1054  pes->total_size = AV_RB16(pes->header + 4);
1055  /* NOTE: a zero total size means the PES size is
1056  * unbounded */
1057  if (!pes->total_size)
1058  pes->total_size = MAX_PES_PAYLOAD;
1059 
1060  /* allocate pes buffer */
1061  pes->buffer = av_buffer_alloc(pes->total_size +
1063  if (!pes->buffer)
1064  return AVERROR(ENOMEM);
1065 
1066  if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1067  code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1068  code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1069  code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1070  pes->state = MPEGTS_PESHEADER;
1071  if (pes->st->codecpar->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1072  av_log(pes->stream, AV_LOG_TRACE,
1073  "pid=%x stream_type=%x probing\n",
1074  pes->pid,
1075  pes->stream_type);
1076  pes->st->request_probe = 1;
1077  }
1078  } else {
1079  pes->pes_header_size = 6;
1080  pes->state = MPEGTS_PAYLOAD;
1081  pes->data_index = 0;
1082  }
1083  } else {
1084  /* otherwise, it should be a table */
1085  /* skip packet */
1086 skip:
1087  pes->state = MPEGTS_SKIP;
1088  continue;
1089  }
1090  }
1091  break;
1092  /**********************************************/
1093  /* PES packing parsing */
1094  case MPEGTS_PESHEADER:
1095  len = PES_HEADER_SIZE - pes->data_index;
1096  if (len < 0)
1097  return AVERROR_INVALIDDATA;
1098  if (len > buf_size)
1099  len = buf_size;
1100  memcpy(pes->header + pes->data_index, p, len);
1101  pes->data_index += len;
1102  p += len;
1103  buf_size -= len;
1104  if (pes->data_index == PES_HEADER_SIZE) {
1105  pes->pes_header_size = pes->header[8] + 9;
1107  }
1108  break;
1109  case MPEGTS_PESHEADER_FILL:
1110  len = pes->pes_header_size - pes->data_index;
1111  if (len < 0)
1112  return AVERROR_INVALIDDATA;
1113  if (len > buf_size)
1114  len = buf_size;
1115  memcpy(pes->header + pes->data_index, p, len);
1116  pes->data_index += len;
1117  p += len;
1118  buf_size -= len;
1119  if (pes->data_index == pes->pes_header_size) {
1120  const uint8_t *r;
1121  unsigned int flags, pes_ext, skip;
1122 
1123  flags = pes->header[7];
1124  r = pes->header + 9;
1125  pes->pts = AV_NOPTS_VALUE;
1126  pes->dts = AV_NOPTS_VALUE;
1127  if ((flags & 0xc0) == 0x80) {
1128  pes->dts = pes->pts = ff_parse_pes_pts(r);
1129  r += 5;
1130  } else if ((flags & 0xc0) == 0xc0) {
1131  pes->pts = ff_parse_pes_pts(r);
1132  r += 5;
1133  pes->dts = ff_parse_pes_pts(r);
1134  r += 5;
1135  }
1136  pes->extended_stream_id = -1;
1137  if (flags & 0x01) { /* PES extension */
1138  pes_ext = *r++;
1139  /* Skip PES private data, program packet sequence counter and P-STD buffer */
1140  skip = (pes_ext >> 4) & 0xb;
1141  skip += skip & 0x9;
1142  r += skip;
1143  if ((pes_ext & 0x41) == 0x01 &&
1144  (r + 2) <= (pes->header + pes->pes_header_size)) {
1145  /* PES extension 2 */
1146  if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1147  pes->extended_stream_id = r[1];
1148  }
1149  }
1150 
1151  /* we got the full header. We parse it and get the payload */
1152  pes->state = MPEGTS_PAYLOAD;
1153  pes->data_index = 0;
1154  if (pes->stream_type == 0x12 && buf_size > 0) {
1155  int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1156  buf_size);
1157  pes->pes_header_size += sl_header_bytes;
1158  p += sl_header_bytes;
1159  buf_size -= sl_header_bytes;
1160  }
1161  if (pes->stream_type == 0x15 && buf_size >= 5) {
1162  /* skip metadata access unit header */
1163  pes->pes_header_size += 5;
1164  p += 5;
1165  buf_size -= 5;
1166  }
1167  if ( pes->ts->fix_teletext_pts
1170  ) {
1171  AVProgram *p = NULL;
1172  while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1173  if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1174  MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1175  if (f) {
1176  AVStream *st = NULL;
1177  if (f->type == MPEGTS_PES) {
1178  PESContext *pcrpes = f->u.pes_filter.opaque;
1179  if (pcrpes)
1180  st = pcrpes->st;
1181  } else if (f->type == MPEGTS_PCR) {
1182  int i;
1183  for (i = 0; i < p->nb_stream_indexes; i++) {
1184  AVStream *pst = pes->stream->streams[p->stream_index[i]];
1185  if (pst->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
1186  st = pst;
1187  }
1188  }
1189  if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1190  // teletext packets do not always have correct timestamps,
1191  // the standard says they should be handled after 40.6 ms at most,
1192  // and the pcr error to this packet should be no more than 100 ms.
1193  // TODO: we should interpolate the PCR, not just use the last one
1194  int64_t pcr = f->last_pcr / 300;
1197  if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1198  pes->pts = pes->dts = pcr;
1199  } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT &&
1200  pes->dts > pcr + 3654 + 9000) {
1201  pes->pts = pes->dts = pcr + 3654 + 9000;
1202  } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE &&
1203  pes->dts > pcr + 10*90000) { //10sec
1204  pes->pts = pes->dts = pcr + 3654 + 9000;
1205  }
1206  break;
1207  }
1208  }
1209  }
1210  }
1211  }
1212  }
1213  break;
1214  case MPEGTS_PAYLOAD:
1215  if (pes->buffer) {
1216  if (pes->data_index > 0 &&
1217  pes->data_index + buf_size > pes->total_size) {
1218  ret = new_pes_packet(pes, ts->pkt);
1219  if (ret < 0)
1220  return ret;
1221  pes->total_size = MAX_PES_PAYLOAD;
1222  pes->buffer = av_buffer_alloc(pes->total_size +
1224  if (!pes->buffer)
1225  return AVERROR(ENOMEM);
1226  ts->stop_parse = 1;
1227  } else if (pes->data_index == 0 &&
1228  buf_size > pes->total_size) {
1229  // pes packet size is < ts size packet and pes data is padded with 0xff
1230  // not sure if this is legal in ts but see issue #2392
1231  buf_size = pes->total_size;
1232  }
1233  memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1234  pes->data_index += buf_size;
1235  /* emit complete packets with known packet size
1236  * decreases demuxer delay for infrequent packets like subtitles from
1237  * a couple of seconds to milliseconds for properly muxed files.
1238  * total_size is the number of bytes following pes_packet_length
1239  * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1240  if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1241  pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1242  ts->stop_parse = 1;
1243  ret = new_pes_packet(pes, ts->pkt);
1244  if (ret < 0)
1245  return ret;
1246  }
1247  }
1248  buf_size = 0;
1249  break;
1250  case MPEGTS_SKIP:
1251  buf_size = 0;
1252  break;
1253  }
1254  }
1255 
1256  return 0;
1257 }
1258 
1259 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1260 {
1261  MpegTSFilter *tss;
1262  PESContext *pes;
1263 
1264  /* if no pid found, then add a pid context */
1265  pes = av_mallocz(sizeof(PESContext));
1266  if (!pes)
1267  return 0;
1268  pes->ts = ts;
1269  pes->stream = ts->stream;
1270  pes->pid = pid;
1271  pes->pcr_pid = pcr_pid;
1272  pes->state = MPEGTS_SKIP;
1273  pes->pts = AV_NOPTS_VALUE;
1274  pes->dts = AV_NOPTS_VALUE;
1275  tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1276  if (!tss) {
1277  av_free(pes);
1278  return 0;
1279  }
1280  return pes;
1281 }
1282 
1283 #define MAX_LEVEL 4
1284 typedef struct MP4DescrParseContext {
1291  int level;
1294 
1296  const uint8_t *buf, unsigned size,
1297  Mp4Descr *descr, int max_descr_count)
1298 {
1299  int ret;
1300  if (size > (1 << 30))
1301  return AVERROR_INVALIDDATA;
1302 
1303  if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1304  NULL, NULL, NULL, NULL)) < 0)
1305  return ret;
1306 
1307  d->s = s;
1308  d->level = 0;
1309  d->descr_count = 0;
1310  d->descr = descr;
1311  d->active_descr = NULL;
1312  d->max_descr_count = max_descr_count;
1313 
1314  return 0;
1315 }
1316 
1317 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1318 {
1319  int64_t new_off = avio_tell(pb);
1320  (*len) -= new_off - *off;
1321  *off = new_off;
1322 }
1323 
1324 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1325  int target_tag);
1326 
1327 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1328 {
1329  while (len > 0) {
1330  int ret = parse_mp4_descr(d, off, len, 0);
1331  if (ret < 0)
1332  return ret;
1333  update_offsets(&d->pb, &off, &len);
1334  }
1335  return 0;
1336 }
1337 
1338 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1339 {
1340  avio_rb16(&d->pb); // ID
1341  avio_r8(&d->pb);
1342  avio_r8(&d->pb);
1343  avio_r8(&d->pb);
1344  avio_r8(&d->pb);
1345  avio_r8(&d->pb);
1346  update_offsets(&d->pb, &off, &len);
1347  return parse_mp4_descr_arr(d, off, len);
1348 }
1349 
1350 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1351 {
1352  int id_flags;
1353  if (len < 2)
1354  return 0;
1355  id_flags = avio_rb16(&d->pb);
1356  if (!(id_flags & 0x0020)) { // URL_Flag
1357  update_offsets(&d->pb, &off, &len);
1358  return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1359  } else {
1360  return 0;
1361  }
1362 }
1363 
1364 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1365 {
1366  int es_id = 0;
1367  int ret = 0;
1368 
1369  if (d->descr_count >= d->max_descr_count)
1370  return AVERROR_INVALIDDATA;
1371  ff_mp4_parse_es_descr(&d->pb, &es_id);
1372  d->active_descr = d->descr + (d->descr_count++);
1373 
1374  d->active_descr->es_id = es_id;
1375  update_offsets(&d->pb, &off, &len);
1376  if ((ret = parse_mp4_descr(d, off, len, MP4DecConfigDescrTag)) < 0)
1377  return ret;
1378  update_offsets(&d->pb, &off, &len);
1379  if (len > 0)
1380  ret = parse_mp4_descr(d, off, len, MP4SLDescrTag);
1381  d->active_descr = NULL;
1382  return ret;
1383 }
1384 
1386  int len)
1387 {
1388  Mp4Descr *descr = d->active_descr;
1389  if (!descr)
1390  return AVERROR_INVALIDDATA;
1392  if (!descr->dec_config_descr)
1393  return AVERROR(ENOMEM);
1394  descr->dec_config_descr_len = len;
1395  avio_read(&d->pb, descr->dec_config_descr, len);
1396  return 0;
1397 }
1398 
1399 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1400 {
1401  Mp4Descr *descr = d->active_descr;
1402  int predefined;
1403  if (!descr)
1404  return AVERROR_INVALIDDATA;
1405 
1406  predefined = avio_r8(&d->pb);
1407  if (!predefined) {
1408  int lengths;
1409  int flags = avio_r8(&d->pb);
1410  descr->sl.use_au_start = !!(flags & 0x80);
1411  descr->sl.use_au_end = !!(flags & 0x40);
1412  descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1413  descr->sl.use_padding = !!(flags & 0x08);
1414  descr->sl.use_timestamps = !!(flags & 0x04);
1415  descr->sl.use_idle = !!(flags & 0x02);
1416  descr->sl.timestamp_res = avio_rb32(&d->pb);
1417  avio_rb32(&d->pb);
1418  descr->sl.timestamp_len = avio_r8(&d->pb);
1419  if (descr->sl.timestamp_len > 64) {
1420  avpriv_request_sample(NULL, "timestamp_len > 64");
1421  descr->sl.timestamp_len = 64;
1422  return AVERROR_PATCHWELCOME;
1423  }
1424  descr->sl.ocr_len = avio_r8(&d->pb);
1425  descr->sl.au_len = avio_r8(&d->pb);
1426  descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1427  lengths = avio_rb16(&d->pb);
1428  descr->sl.degr_prior_len = lengths >> 12;
1429  descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1430  descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1431  } else if (!d->predefined_SLConfigDescriptor_seen){
1432  avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1434  }
1435  return 0;
1436 }
1437 
1438 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1439  int target_tag)
1440 {
1441  int tag;
1442  int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1443  int ret = 0;
1444 
1445  update_offsets(&d->pb, &off, &len);
1446  if (len < 0 || len1 > len || len1 <= 0) {
1447  av_log(d->s, AV_LOG_ERROR,
1448  "Tag %x length violation new length %d bytes remaining %d\n",
1449  tag, len1, len);
1450  return AVERROR_INVALIDDATA;
1451  }
1452 
1453  if (d->level++ >= MAX_LEVEL) {
1454  av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1455  ret = AVERROR_INVALIDDATA;
1456  goto done;
1457  }
1458 
1459  if (target_tag && tag != target_tag) {
1460  av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1461  target_tag);
1462  ret = AVERROR_INVALIDDATA;
1463  goto done;
1464  }
1465 
1466  switch (tag) {
1467  case MP4IODescrTag:
1468  ret = parse_MP4IODescrTag(d, off, len1);
1469  break;
1470  case MP4ODescrTag:
1471  ret = parse_MP4ODescrTag(d, off, len1);
1472  break;
1473  case MP4ESDescrTag:
1474  ret = parse_MP4ESDescrTag(d, off, len1);
1475  break;
1476  case MP4DecConfigDescrTag:
1477  ret = parse_MP4DecConfigDescrTag(d, off, len1);
1478  break;
1479  case MP4SLDescrTag:
1480  ret = parse_MP4SLDescrTag(d, off, len1);
1481  break;
1482  }
1483 
1484 
1485 done:
1486  d->level--;
1487  avio_seek(&d->pb, off + len1, SEEK_SET);
1488  return ret;
1489 }
1490 
1491 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1492  Mp4Descr *descr, int *descr_count, int max_descr_count)
1493 {
1495  int ret;
1496 
1497  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1498  if (ret < 0)
1499  return ret;
1500 
1501  ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1502 
1503  *descr_count = d.descr_count;
1504  return ret;
1505 }
1506 
1507 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1508  Mp4Descr *descr, int *descr_count, int max_descr_count)
1509 {
1511  int ret;
1512 
1513  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1514  if (ret < 0)
1515  return ret;
1516 
1517  ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1518 
1519  *descr_count = d.descr_count;
1520  return ret;
1521 }
1522 
1524  int section_len)
1525 {
1526  MpegTSContext *ts = filter->u.section_filter.opaque;
1527  MpegTSSectionFilter *tssf = &filter->u.section_filter;
1528  SectionHeader h;
1529  const uint8_t *p, *p_end;
1530  AVIOContext pb;
1531  int mp4_descr_count = 0;
1532  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1533  int i, pid;
1534  AVFormatContext *s = ts->stream;
1535 
1536  p_end = section + section_len - 4;
1537  p = section;
1538  if (parse_section_header(&h, &p, p_end) < 0)
1539  return;
1540  if (h.tid != M4OD_TID)
1541  return;
1542  if (skip_identical(&h, tssf))
1543  return;
1544 
1545  mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1547 
1548  for (pid = 0; pid < NB_PID_MAX; pid++) {
1549  if (!ts->pids[pid])
1550  continue;
1551  for (i = 0; i < mp4_descr_count; i++) {
1552  PESContext *pes;
1553  AVStream *st;
1554  if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1555  continue;
1556  if (ts->pids[pid]->type != MPEGTS_PES) {
1557  av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1558  continue;
1559  }
1560  pes = ts->pids[pid]->u.pes_filter.opaque;
1561  st = pes->st;
1562  if (!st)
1563  continue;
1564 
1565  pes->sl = mp4_descr[i].sl;
1566 
1567  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1568  mp4_descr[i].dec_config_descr_len, 0,
1569  NULL, NULL, NULL, NULL);
1570  ff_mp4_read_dec_config_descr(s, st, &pb);
1571  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1572  st->codecpar->extradata_size > 0)
1573  st->need_parsing = 0;
1574  if (st->codecpar->codec_id == AV_CODEC_ID_H264 &&
1575  st->codecpar->extradata_size > 0)
1576  st->need_parsing = 0;
1577 
1579  st->internal->need_context_update = 1;
1580  }
1581  }
1582  for (i = 0; i < mp4_descr_count; i++)
1583  av_free(mp4_descr[i].dec_config_descr);
1584 }
1585 
1587  1, 0, 1, 1, 2, 2, 2, 3, 3
1588 };
1589 
1590 static const uint8_t opus_stream_cnt[9] = {
1591  1, 1, 1, 2, 2, 3, 4, 4, 5,
1592 };
1593 
1594 static const uint8_t opus_channel_map[8][8] = {
1595  { 0 },
1596  { 0,1 },
1597  { 0,2,1 },
1598  { 0,1,2,3 },
1599  { 0,4,1,2,3 },
1600  { 0,4,1,2,3,5 },
1601  { 0,4,1,2,3,5,6 },
1602  { 0,6,1,2,3,4,5,7 },
1603 };
1604 
1606  const uint8_t **pp, const uint8_t *desc_list_end,
1607  Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1608  MpegTSContext *ts)
1609 {
1610  const uint8_t *desc_end;
1611  int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1612  char language[252];
1613  int i;
1614 
1615  desc_tag = get8(pp, desc_list_end);
1616  if (desc_tag < 0)
1617  return AVERROR_INVALIDDATA;
1618  desc_len = get8(pp, desc_list_end);
1619  if (desc_len < 0)
1620  return AVERROR_INVALIDDATA;
1621  desc_end = *pp + desc_len;
1622  if (desc_end > desc_list_end)
1623  return AVERROR_INVALIDDATA;
1624 
1625  av_log(fc, AV_LOG_TRACE, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1626 
1627  if ((st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1628  stream_type == STREAM_TYPE_PRIVATE_DATA)
1629  mpegts_find_stream_type(st, desc_tag, DESC_types);
1630 
1631  switch (desc_tag) {
1632  case 0x1E: /* SL descriptor */
1633  desc_es_id = get16(pp, desc_end);
1634  if (desc_es_id < 0)
1635  break;
1636  if (ts && ts->pids[pid])
1637  ts->pids[pid]->es_id = desc_es_id;
1638  for (i = 0; i < mp4_descr_count; i++)
1639  if (mp4_descr[i].dec_config_descr_len &&
1640  mp4_descr[i].es_id == desc_es_id) {
1641  AVIOContext pb;
1642  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1643  mp4_descr[i].dec_config_descr_len, 0,
1644  NULL, NULL, NULL, NULL);
1645  ff_mp4_read_dec_config_descr(fc, st, &pb);
1646  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1647  st->codecpar->extradata_size > 0) {
1648  st->need_parsing = 0;
1649  st->internal->need_context_update = 1;
1650  }
1652  mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1653  }
1654  break;
1655  case 0x1F: /* FMC descriptor */
1656  if (get16(pp, desc_end) < 0)
1657  break;
1658  if (mp4_descr_count > 0 &&
1660  (st->request_probe == 0 && st->codecpar->codec_id == AV_CODEC_ID_NONE) ||
1661  st->request_probe > 0) &&
1662  mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1663  AVIOContext pb;
1664  ffio_init_context(&pb, mp4_descr->dec_config_descr,
1665  mp4_descr->dec_config_descr_len, 0,
1666  NULL, NULL, NULL, NULL);
1667  ff_mp4_read_dec_config_descr(fc, st, &pb);
1668  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1669  st->codecpar->extradata_size > 0) {
1670  st->request_probe = st->need_parsing = 0;
1672  st->internal->need_context_update = 1;
1673  }
1674  }
1675  break;
1676  case 0x56: /* DVB teletext descriptor */
1677  {
1678  uint8_t *extradata = NULL;
1679  int language_count = desc_len / 5;
1680 
1681  if (desc_len > 0 && desc_len % 5 != 0)
1682  return AVERROR_INVALIDDATA;
1683 
1684  if (language_count > 0) {
1685  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1686  av_assert0(language_count <= sizeof(language) / 4);
1687 
1688  if (st->codecpar->extradata == NULL) {
1689  if (ff_alloc_extradata(st->codecpar, language_count * 2)) {
1690  return AVERROR(ENOMEM);
1691  }
1692  }
1693 
1694  if (st->codecpar->extradata_size < language_count * 2)
1695  return AVERROR_INVALIDDATA;
1696 
1697  extradata = st->codecpar->extradata;
1698 
1699  for (i = 0; i < language_count; i++) {
1700  language[i * 4 + 0] = get8(pp, desc_end);
1701  language[i * 4 + 1] = get8(pp, desc_end);
1702  language[i * 4 + 2] = get8(pp, desc_end);
1703  language[i * 4 + 3] = ',';
1704 
1705  memcpy(extradata, *pp, 2);
1706  extradata += 2;
1707 
1708  *pp += 2;
1709  }
1710 
1711  language[i * 4 - 1] = 0;
1712  av_dict_set(&st->metadata, "language", language, 0);
1713  st->internal->need_context_update = 1;
1714  }
1715  }
1716  break;
1717  case 0x59: /* subtitling descriptor */
1718  {
1719  /* 8 bytes per DVB subtitle substream data:
1720  * ISO_639_language_code (3 bytes),
1721  * subtitling_type (1 byte),
1722  * composition_page_id (2 bytes),
1723  * ancillary_page_id (2 bytes) */
1724  int language_count = desc_len / 8;
1725 
1726  if (desc_len > 0 && desc_len % 8 != 0)
1727  return AVERROR_INVALIDDATA;
1728 
1729  if (language_count > 1) {
1730  avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1731  }
1732 
1733  if (language_count > 0) {
1734  uint8_t *extradata;
1735 
1736  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1737  av_assert0(language_count <= sizeof(language) / 4);
1738 
1739  if (st->codecpar->extradata == NULL) {
1740  if (ff_alloc_extradata(st->codecpar, language_count * 5)) {
1741  return AVERROR(ENOMEM);
1742  }
1743  }
1744 
1745  if (st->codecpar->extradata_size < language_count * 5)
1746  return AVERROR_INVALIDDATA;
1747 
1748  extradata = st->codecpar->extradata;
1749 
1750  for (i = 0; i < language_count; i++) {
1751  language[i * 4 + 0] = get8(pp, desc_end);
1752  language[i * 4 + 1] = get8(pp, desc_end);
1753  language[i * 4 + 2] = get8(pp, desc_end);
1754  language[i * 4 + 3] = ',';
1755 
1756  /* hearing impaired subtitles detection using subtitling_type */
1757  switch (*pp[0]) {
1758  case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1759  case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1760  case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1761  case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1762  case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1763  case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1765  break;
1766  }
1767 
1768  extradata[4] = get8(pp, desc_end); /* subtitling_type */
1769  memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1770  extradata += 5;
1771 
1772  *pp += 4;
1773  }
1774 
1775  language[i * 4 - 1] = 0;
1776  av_dict_set(&st->metadata, "language", language, 0);
1777  st->internal->need_context_update = 1;
1778  }
1779  }
1780  break;
1781  case 0x0a: /* ISO 639 language descriptor */
1782  for (i = 0; i + 4 <= desc_len; i += 4) {
1783  language[i + 0] = get8(pp, desc_end);
1784  language[i + 1] = get8(pp, desc_end);
1785  language[i + 2] = get8(pp, desc_end);
1786  language[i + 3] = ',';
1787  switch (get8(pp, desc_end)) {
1788  case 0x01:
1790  break;
1791  case 0x02:
1793  break;
1794  case 0x03:
1796  break;
1797  }
1798  }
1799  if (i && language[0]) {
1800  language[i - 1] = 0;
1801  av_dict_set(&st->metadata, "language", language, 0);
1802  }
1803  break;
1804  case 0x05: /* registration descriptor */
1805  st->codecpar->codec_tag = bytestream_get_le32(pp);
1806  av_log(fc, AV_LOG_TRACE, "reg_desc=%.4s\n", (char *)&st->codecpar->codec_tag);
1807  if (st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0)
1808  mpegts_find_stream_type(st, st->codecpar->codec_tag, REGD_types);
1809  break;
1810  case 0x52: /* stream identifier descriptor */
1811  st->stream_identifier = 1 + get8(pp, desc_end);
1812  break;
1813  case 0x26: /* metadata descriptor */
1814  if (get16(pp, desc_end) == 0xFFFF)
1815  *pp += 4;
1816  if (get8(pp, desc_end) == 0xFF) {
1817  st->codecpar->codec_tag = bytestream_get_le32(pp);
1818  if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
1819  mpegts_find_stream_type(st, st->codecpar->codec_tag, METADATA_types);
1820  }
1821  break;
1822  case 0x7f: /* DVB extension descriptor */
1823  ext_desc_tag = get8(pp, desc_end);
1824  if (ext_desc_tag < 0)
1825  return AVERROR_INVALIDDATA;
1826  if (st->codecpar->codec_id == AV_CODEC_ID_OPUS &&
1827  ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1828  if (!st->codecpar->extradata) {
1831  if (!st->codecpar->extradata)
1832  return AVERROR(ENOMEM);
1833 
1836 
1837  channel_config_code = get8(pp, desc_end);
1838  if (channel_config_code < 0)
1839  return AVERROR_INVALIDDATA;
1840  if (channel_config_code <= 0x8) {
1841  st->codecpar->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1842  st->codecpar->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
1843  st->codecpar->extradata[19] = opus_stream_cnt[channel_config_code];
1844  st->codecpar->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1845  memcpy(&st->codecpar->extradata[21], opus_channel_map[channels - 1], channels);
1846  } else {
1847  avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1848  }
1850  st->internal->need_context_update = 1;
1851  }
1852  }
1853  break;
1854  default:
1855  break;
1856  }
1857  *pp = desc_end;
1858  return 0;
1859 }
1860 
1861 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1862 {
1863  MpegTSContext *ts = filter->u.section_filter.opaque;
1864  MpegTSSectionFilter *tssf = &filter->u.section_filter;
1865  SectionHeader h1, *h = &h1;
1866  PESContext *pes;
1867  AVStream *st;
1868  const uint8_t *p, *p_end, *desc_list_end;
1869  int program_info_length, pcr_pid, pid, stream_type;
1870  int desc_list_len;
1871  uint32_t prog_reg_desc = 0; /* registration descriptor */
1872 
1873  int mp4_descr_count = 0;
1874  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1875  int i;
1876 
1877  av_log(ts->stream, AV_LOG_TRACE, "PMT: len %i\n", section_len);
1878  hex_dump_debug(ts->stream, section, section_len);
1879 
1880  p_end = section + section_len - 4;
1881  p = section;
1882  if (parse_section_header(h, &p, p_end) < 0)
1883  return;
1884  if (skip_identical(h, tssf))
1885  return;
1886 
1887  av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x sec_num=%d/%d version=%d\n",
1888  h->id, h->sec_num, h->last_sec_num, h->version);
1889 
1890  if (h->tid != PMT_TID)
1891  return;
1892  if (!ts->scan_all_pmts && ts->skip_changes)
1893  return;
1894 
1895  if (!ts->skip_clear)
1896  clear_program(ts, h->id);
1897 
1898  pcr_pid = get16(&p, p_end);
1899  if (pcr_pid < 0)
1900  return;
1901  pcr_pid &= 0x1fff;
1902  add_pid_to_pmt(ts, h->id, pcr_pid);
1903  set_pcr_pid(ts->stream, h->id, pcr_pid);
1904 
1905  av_log(ts->stream, AV_LOG_TRACE, "pcr_pid=0x%x\n", pcr_pid);
1906 
1907  program_info_length = get16(&p, p_end);
1908  if (program_info_length < 0)
1909  return;
1910  program_info_length &= 0xfff;
1911  while (program_info_length >= 2) {
1912  uint8_t tag, len;
1913  tag = get8(&p, p_end);
1914  len = get8(&p, p_end);
1915 
1916  av_log(ts->stream, AV_LOG_TRACE, "program tag: 0x%02x len=%d\n", tag, len);
1917 
1918  if (len > program_info_length - 2)
1919  // something else is broken, exit the program_descriptors_loop
1920  break;
1921  program_info_length -= len + 2;
1922  if (tag == 0x1d) { // IOD descriptor
1923  get8(&p, p_end); // scope
1924  get8(&p, p_end); // label
1925  len -= 2;
1926  mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1927  &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1928  } else if (tag == 0x05 && len >= 4) { // registration descriptor
1929  prog_reg_desc = bytestream_get_le32(&p);
1930  len -= 4;
1931  }
1932  p += len;
1933  }
1934  p += program_info_length;
1935  if (p >= p_end)
1936  goto out;
1937 
1938  // stop parsing after pmt, we found header
1939  if (!ts->stream->nb_streams)
1940  ts->stop_parse = 2;
1941 
1942  set_pmt_found(ts, h->id);
1943 
1944 
1945  for (;;) {
1946  st = 0;
1947  pes = NULL;
1948  stream_type = get8(&p, p_end);
1949  if (stream_type < 0)
1950  break;
1951  pid = get16(&p, p_end);
1952  if (pid < 0)
1953  goto out;
1954  pid &= 0x1fff;
1955  if (pid == ts->current_pid)
1956  goto out;
1957 
1958  /* now create stream */
1959  if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1960  pes = ts->pids[pid]->u.pes_filter.opaque;
1961  if (!pes->st) {
1962  pes->st = avformat_new_stream(pes->stream, NULL);
1963  if (!pes->st)
1964  goto out;
1965  pes->st->id = pes->pid;
1966  }
1967  st = pes->st;
1968  } else if (stream_type != 0x13) {
1969  if (ts->pids[pid])
1970  mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1971  pes = add_pes_stream(ts, pid, pcr_pid);
1972  if (pes) {
1973  st = avformat_new_stream(pes->stream, NULL);
1974  if (!st)
1975  goto out;
1976  st->id = pes->pid;
1977  }
1978  } else {
1979  int idx = ff_find_stream_index(ts->stream, pid);
1980  if (idx >= 0) {
1981  st = ts->stream->streams[idx];
1982  } else {
1983  st = avformat_new_stream(ts->stream, NULL);
1984  if (!st)
1985  goto out;
1986  st->id = pid;
1988  }
1989  }
1990 
1991  if (!st)
1992  goto out;
1993 
1994  if (pes && !pes->stream_type)
1995  mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1996 
1997  add_pid_to_pmt(ts, h->id, pid);
1998 
2000 
2001  desc_list_len = get16(&p, p_end);
2002  if (desc_list_len < 0)
2003  goto out;
2004  desc_list_len &= 0xfff;
2005  desc_list_end = p + desc_list_len;
2006  if (desc_list_end > p_end)
2007  goto out;
2008  for (;;) {
2009  if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
2010  desc_list_end, mp4_descr,
2011  mp4_descr_count, pid, ts) < 0)
2012  break;
2013 
2014  if (pes && prog_reg_desc == AV_RL32("HDMV") &&
2015  stream_type == 0x83 && pes->sub_st) {
2017  pes->sub_st->index);
2018  pes->sub_st->codecpar->codec_tag = st->codecpar->codec_tag;
2019  }
2020  }
2021  p = desc_list_end;
2022  }
2023 
2024  if (!ts->pids[pcr_pid])
2025  mpegts_open_pcr_filter(ts, pcr_pid);
2026 
2027 out:
2028  for (i = 0; i < mp4_descr_count; i++)
2029  av_free(mp4_descr[i].dec_config_descr);
2030 }
2031 
2032 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2033 {
2034  MpegTSContext *ts = filter->u.section_filter.opaque;
2035  MpegTSSectionFilter *tssf = &filter->u.section_filter;
2036  SectionHeader h1, *h = &h1;
2037  const uint8_t *p, *p_end;
2038  int sid, pmt_pid;
2039  AVProgram *program;
2040 
2041  av_log(ts->stream, AV_LOG_TRACE, "PAT:\n");
2042  hex_dump_debug(ts->stream, section, section_len);
2043 
2044  p_end = section + section_len - 4;
2045  p = section;
2046  if (parse_section_header(h, &p, p_end) < 0)
2047  return;
2048  if (h->tid != PAT_TID)
2049  return;
2050  if (ts->skip_changes)
2051  return;
2052 
2053  if (skip_identical(h, tssf))
2054  return;
2055  ts->stream->ts_id = h->id;
2056 
2057  clear_programs(ts);
2058  for (;;) {
2059  sid = get16(&p, p_end);
2060  if (sid < 0)
2061  break;
2062  pmt_pid = get16(&p, p_end);
2063  if (pmt_pid < 0)
2064  break;
2065  pmt_pid &= 0x1fff;
2066 
2067  if (pmt_pid == ts->current_pid)
2068  break;
2069 
2070  av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
2071 
2072  if (sid == 0x0000) {
2073  /* NIT info */
2074  } else {
2075  MpegTSFilter *fil = ts->pids[pmt_pid];
2076  program = av_new_program(ts->stream, sid);
2077  if (program) {
2078  program->program_num = sid;
2079  program->pmt_pid = pmt_pid;
2080  }
2081  if (fil)
2082  if ( fil->type != MPEGTS_SECTION
2083  || fil->pid != pmt_pid
2084  || fil->u.section_filter.section_cb != pmt_cb)
2085  mpegts_close_filter(ts, ts->pids[pmt_pid]);
2086 
2087  if (!ts->pids[pmt_pid])
2088  mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2089  add_pat_entry(ts, sid);
2090  add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2091  add_pid_to_pmt(ts, sid, pmt_pid);
2092  }
2093  }
2094 
2095  if (sid < 0) {
2096  int i,j;
2097  for (j=0; j<ts->stream->nb_programs; j++) {
2098  for (i = 0; i < ts->nb_prg; i++)
2099  if (ts->prg[i].id == ts->stream->programs[j]->id)
2100  break;
2101  if (i==ts->nb_prg && !ts->skip_clear)
2102  clear_avprogram(ts, ts->stream->programs[j]->id);
2103  }
2104  }
2105 }
2106 
2107 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2108 {
2109  MpegTSContext *ts = filter->u.section_filter.opaque;
2110  MpegTSSectionFilter *tssf = &filter->u.section_filter;
2111  SectionHeader h1, *h = &h1;
2112  const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2113  int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2114  char *name, *provider_name;
2115 
2116  av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
2117  hex_dump_debug(ts->stream, section, section_len);
2118 
2119  p_end = section + section_len - 4;
2120  p = section;
2121  if (parse_section_header(h, &p, p_end) < 0)
2122  return;
2123  if (h->tid != SDT_TID)
2124  return;
2125  if (ts->skip_changes)
2126  return;
2127  if (skip_identical(h, tssf))
2128  return;
2129 
2130  onid = get16(&p, p_end);
2131  if (onid < 0)
2132  return;
2133  val = get8(&p, p_end);
2134  if (val < 0)
2135  return;
2136  for (;;) {
2137  sid = get16(&p, p_end);
2138  if (sid < 0)
2139  break;
2140  val = get8(&p, p_end);
2141  if (val < 0)
2142  break;
2143  desc_list_len = get16(&p, p_end);
2144  if (desc_list_len < 0)
2145  break;
2146  desc_list_len &= 0xfff;
2147  desc_list_end = p + desc_list_len;
2148  if (desc_list_end > p_end)
2149  break;
2150  for (;;) {
2151  desc_tag = get8(&p, desc_list_end);
2152  if (desc_tag < 0)
2153  break;
2154  desc_len = get8(&p, desc_list_end);
2155  desc_end = p + desc_len;
2156  if (desc_len < 0 || desc_end > desc_list_end)
2157  break;
2158 
2159  av_log(ts->stream, AV_LOG_TRACE, "tag: 0x%02x len=%d\n",
2160  desc_tag, desc_len);
2161 
2162  switch (desc_tag) {
2163  case 0x48:
2164  service_type = get8(&p, p_end);
2165  if (service_type < 0)
2166  break;
2167  provider_name = getstr8(&p, p_end);
2168  if (!provider_name)
2169  break;
2170  name = getstr8(&p, p_end);
2171  if (name) {
2172  AVProgram *program = av_new_program(ts->stream, sid);
2173  if (program) {
2174  av_dict_set(&program->metadata, "service_name", name, 0);
2175  av_dict_set(&program->metadata, "service_provider",
2176  provider_name, 0);
2177  }
2178  }
2179  av_free(name);
2180  av_free(provider_name);
2181  break;
2182  default:
2183  break;
2184  }
2185  p = desc_end;
2186  }
2187  p = desc_list_end;
2188  }
2189 }
2190 
2191 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2192  const uint8_t *packet);
2193 
2194 /* handle one TS packet */
2195 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2196 {
2197  MpegTSFilter *tss;
2198  int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2199  has_adaptation, has_payload;
2200  const uint8_t *p, *p_end;
2201  int64_t pos;
2202 
2203  pid = AV_RB16(packet + 1) & 0x1fff;
2204  if (pid && discard_pid(ts, pid))
2205  return 0;
2206  is_start = packet[1] & 0x40;
2207  tss = ts->pids[pid];
2208  if (ts->auto_guess && !tss && is_start) {
2209  add_pes_stream(ts, pid, -1);
2210  tss = ts->pids[pid];
2211  }
2212  if (!tss)
2213  return 0;
2214  ts->current_pid = pid;
2215 
2216  afc = (packet[3] >> 4) & 3;
2217  if (afc == 0) /* reserved value */
2218  return 0;
2219  has_adaptation = afc & 2;
2220  has_payload = afc & 1;
2221  is_discontinuity = has_adaptation &&
2222  packet[4] != 0 && /* with length > 0 */
2223  (packet[5] & 0x80); /* and discontinuity indicated */
2224 
2225  /* continuity check (currently not used) */
2226  cc = (packet[3] & 0xf);
2227  expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2228  cc_ok = pid == 0x1FFF || // null packet PID
2229  is_discontinuity ||
2230  tss->last_cc < 0 ||
2231  expected_cc == cc;
2232 
2233  tss->last_cc = cc;
2234  if (!cc_ok) {
2235  av_log(ts->stream, AV_LOG_DEBUG,
2236  "Continuity check failed for pid %d expected %d got %d\n",
2237  pid, expected_cc, cc);
2238  if (tss->type == MPEGTS_PES) {
2239  PESContext *pc = tss->u.pes_filter.opaque;
2240  pc->flags |= AV_PKT_FLAG_CORRUPT;
2241  }
2242  }
2243 
2244  p = packet + 4;
2245  if (has_adaptation) {
2246  int64_t pcr_h;
2247  int pcr_l;
2248  if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2249  tss->last_pcr = pcr_h * 300 + pcr_l;
2250  /* skip adaptation field */
2251  p += p[0] + 1;
2252  }
2253  /* if past the end of packet, ignore */
2254  p_end = packet + TS_PACKET_SIZE;
2255  if (p >= p_end || !has_payload)
2256  return 0;
2257 
2258  pos = avio_tell(ts->stream->pb);
2259  if (pos >= 0) {
2260  av_assert0(pos >= TS_PACKET_SIZE);
2261  ts->pos47_full = pos - TS_PACKET_SIZE;
2262  }
2263 
2264  if (tss->type == MPEGTS_SECTION) {
2265  if (is_start) {
2266  /* pointer field present */
2267  len = *p++;
2268  if (len > p_end - p)
2269  return 0;
2270  if (len && cc_ok) {
2271  /* write remaining section bytes */
2272  write_section_data(ts, tss,
2273  p, len, 0);
2274  /* check whether filter has been closed */
2275  if (!ts->pids[pid])
2276  return 0;
2277  }
2278  p += len;
2279  if (p < p_end) {
2280  write_section_data(ts, tss,
2281  p, p_end - p, 1);
2282  }
2283  } else {
2284  if (cc_ok) {
2285  write_section_data(ts, tss,
2286  p, p_end - p, 0);
2287  }
2288  }
2289 
2290  // stop find_stream_info from waiting for more streams
2291  // when all programs have received a PMT
2292  if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2293  int i;
2294  for (i = 0; i < ts->nb_prg; i++) {
2295  if (!ts->prg[i].pmt_found)
2296  break;
2297  }
2298  if (i == ts->nb_prg && ts->nb_prg > 0) {
2299  int types = 0;
2300  for (i = 0; i < ts->stream->nb_streams; i++) {
2301  AVStream *st = ts->stream->streams[i];
2302  types |= 1<<st->codecpar->codec_type;
2303  }
2304  if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2305  av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2307  }
2308  }
2309  }
2310 
2311  } else {
2312  int ret;
2313  // Note: The position here points actually behind the current packet.
2314  if (tss->type == MPEGTS_PES) {
2315  if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2316  pos - ts->raw_packet_size)) < 0)
2317  return ret;
2318  }
2319  }
2320 
2321  return 0;
2322 }
2323 
2324 static void reanalyze(MpegTSContext *ts) {
2325  AVIOContext *pb = ts->stream->pb;
2326  int64_t pos = avio_tell(pb);
2327  if (pos < 0)
2328  return;
2329  pos -= ts->pos47_full;
2330  if (pos == TS_PACKET_SIZE) {
2331  ts->size_stat[0] ++;
2332  } else if (pos == TS_DVHS_PACKET_SIZE) {
2333  ts->size_stat[1] ++;
2334  } else if (pos == TS_FEC_PACKET_SIZE) {
2335  ts->size_stat[2] ++;
2336  }
2337 
2338  ts->size_stat_count ++;
2340  int newsize = 0;
2341  if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2342  newsize = TS_PACKET_SIZE;
2343  } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2344  newsize = TS_DVHS_PACKET_SIZE;
2345  } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2346  newsize = TS_FEC_PACKET_SIZE;
2347  }
2348  if (newsize && newsize != ts->raw_packet_size) {
2349  av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2350  ts->raw_packet_size = newsize;
2351  }
2352  ts->size_stat_count = 0;
2353  memset(ts->size_stat, 0, sizeof(ts->size_stat));
2354  }
2355 }
2356 
2357 /* XXX: try to find a better synchro over several packets (use
2358  * get_packet_size() ?) */
2359 static int mpegts_resync(AVFormatContext *s, int seekback, const uint8_t *current_packet)
2360 {
2361  MpegTSContext *ts = s->priv_data;
2362  AVIOContext *pb = s->pb;
2363  int c, i;
2364  uint64_t pos = avio_tell(pb);
2365 
2366  avio_seek(pb, -FFMIN(seekback, pos), SEEK_CUR);
2367 
2368  //Special case for files like 01c56b0dc1.ts
2369  if (current_packet[0] == 0x80 && current_packet[12] == 0x47) {
2370  avio_seek(pb, 12, SEEK_CUR);
2371  return 0;
2372  }
2373 
2374  for (i = 0; i < ts->resync_size; i++) {
2375  c = avio_r8(pb);
2376  if (avio_feof(pb))
2377  return AVERROR_EOF;
2378  if (c == 0x47) {
2379  avio_seek(pb, -1, SEEK_CUR);
2380  reanalyze(s->priv_data);
2381  return 0;
2382  }
2383  }
2384  av_log(s, AV_LOG_ERROR,
2385  "max resync size reached, could not find sync byte\n");
2386  /* no sync found */
2387  return AVERROR_INVALIDDATA;
2388 }
2389 
2390 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2391 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2392  const uint8_t **data)
2393 {
2394  AVIOContext *pb = s->pb;
2395  int len;
2396 
2397  for (;;) {
2398  len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2399  if (len != TS_PACKET_SIZE)
2400  return len < 0 ? len : AVERROR_EOF;
2401  /* check packet sync byte */
2402  if ((*data)[0] != 0x47) {
2403  /* find a new packet start */
2404 
2405  if (mpegts_resync(s, raw_packet_size, *data) < 0)
2406  return AVERROR(EAGAIN);
2407  else
2408  continue;
2409  } else {
2410  break;
2411  }
2412  }
2413  return 0;
2414 }
2415 
2416 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2417 {
2418  AVIOContext *pb = s->pb;
2419  int skip = raw_packet_size - TS_PACKET_SIZE;
2420  if (skip > 0)
2421  avio_skip(pb, skip);
2422 }
2423 
2424 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2425 {
2426  AVFormatContext *s = ts->stream;
2428  const uint8_t *data;
2429  int64_t packet_num;
2430  int ret = 0;
2431 
2432  if (avio_tell(s->pb) != ts->last_pos) {
2433  int i;
2434  av_log(ts->stream, AV_LOG_TRACE, "Skipping after seek\n");
2435  /* seek detected, flush pes buffer */
2436  for (i = 0; i < NB_PID_MAX; i++) {
2437  if (ts->pids[i]) {
2438  if (ts->pids[i]->type == MPEGTS_PES) {
2439  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2440  av_buffer_unref(&pes->buffer);
2441  pes->data_index = 0;
2442  pes->state = MPEGTS_SKIP; /* skip until pes header */
2443  } else if (ts->pids[i]->type == MPEGTS_SECTION) {
2444  ts->pids[i]->u.section_filter.last_ver = -1;
2445  }
2446  ts->pids[i]->last_cc = -1;
2447  ts->pids[i]->last_pcr = -1;
2448  }
2449  }
2450  }
2451 
2452  ts->stop_parse = 0;
2453  packet_num = 0;
2454  memset(packet + TS_PACKET_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
2455  for (;;) {
2456  packet_num++;
2457  if (nb_packets != 0 && packet_num >= nb_packets ||
2458  ts->stop_parse > 1) {
2459  ret = AVERROR(EAGAIN);
2460  break;
2461  }
2462  if (ts->stop_parse > 0)
2463  break;
2464 
2465  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2466  if (ret != 0)
2467  break;
2468  ret = handle_packet(ts, data);
2470  if (ret != 0)
2471  break;
2472  }
2473  ts->last_pos = avio_tell(s->pb);
2474  return ret;
2475 }
2476 
2478 {
2479  const int size = p->buf_size;
2480  int maxscore = 0;
2481  int sumscore = 0;
2482  int i;
2483  int check_count = size / TS_FEC_PACKET_SIZE;
2484 #define CHECK_COUNT 10
2485 #define CHECK_BLOCK 100
2486 
2487  if (!check_count)
2488  return 0;
2489 
2490  for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2491  int left = FFMIN(check_count - i, CHECK_BLOCK);
2492  int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , 1);
2493  int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, 1);
2494  int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , 1);
2495  score = FFMAX3(score, dvhs_score, fec_score);
2496  sumscore += score;
2497  maxscore = FFMAX(maxscore, score);
2498  }
2499 
2500  sumscore = sumscore * CHECK_COUNT / check_count;
2501  maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2502 
2503  ff_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2504 
2505  if (check_count >= CHECK_COUNT && sumscore > 6) {
2506  return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2507  } else if (check_count >= CHECK_COUNT && maxscore > 6) {
2508  return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2509  } else if (sumscore > 6) {
2510  return 2;
2511  } else {
2512  return 0;
2513  }
2514 }
2515 
2516 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2517  * (-1) if not available */
2518 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2519 {
2520  int afc, len, flags;
2521  const uint8_t *p;
2522  unsigned int v;
2523 
2524  afc = (packet[3] >> 4) & 3;
2525  if (afc <= 1)
2526  return AVERROR_INVALIDDATA;
2527  p = packet + 4;
2528  len = p[0];
2529  p++;
2530  if (len == 0)
2531  return AVERROR_INVALIDDATA;
2532  flags = *p++;
2533  len--;
2534  if (!(flags & 0x10))
2535  return AVERROR_INVALIDDATA;
2536  if (len < 6)
2537  return AVERROR_INVALIDDATA;
2538  v = AV_RB32(p);
2539  *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2540  *ppcr_low = ((p[4] & 1) << 8) | p[5];
2541  return 0;
2542 }
2543 
2544 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2545 
2546  /* NOTE: We attempt to seek on non-seekable files as well, as the
2547  * probe buffer usually is big enough. Only warn if the seek failed
2548  * on files where the seek should work. */
2549  if (avio_seek(pb, pos, SEEK_SET) < 0)
2550  av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2551 }
2552 
2554 {
2555  MpegTSContext *ts = s->priv_data;
2556  AVIOContext *pb = s->pb;
2557  uint8_t buf[8 * 1024] = {0};
2558  int len;
2559  int64_t pos, probesize = s->probesize;
2560 
2561  if (ffio_ensure_seekback(pb, probesize) < 0)
2562  av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
2563 
2564  /* read the first 8192 bytes to get packet size */
2565  pos = avio_tell(pb);
2566  len = avio_read(pb, buf, sizeof(buf));
2567  ts->raw_packet_size = get_packet_size(buf, len);
2568  if (ts->raw_packet_size <= 0) {
2569  av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2571  }
2572  ts->stream = s;
2573  ts->auto_guess = 0;
2574 
2575  if (s->iformat == &ff_mpegts_demuxer) {
2576  /* normal demux */
2577 
2578  /* first do a scan to get all the services */
2579  seek_back(s, pb, pos);
2580 
2582 
2584 
2585  handle_packets(ts, probesize / ts->raw_packet_size);
2586  /* if could not find service, enable auto_guess */
2587 
2588  ts->auto_guess = 1;
2589 
2590  av_log(ts->stream, AV_LOG_TRACE, "tuning done\n");
2591 
2593  } else {
2594  AVStream *st;
2595  int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2596  int64_t pcrs[2], pcr_h;
2597  int packet_count[2];
2598  uint8_t packet[TS_PACKET_SIZE];
2599  const uint8_t *data;
2600 
2601  /* only read packets */
2602 
2603  st = avformat_new_stream(s, NULL);
2604  if (!st)
2605  return AVERROR(ENOMEM);
2606  avpriv_set_pts_info(st, 60, 1, 27000000);
2609 
2610  /* we iterate until we find two PCRs to estimate the bitrate */
2611  pcr_pid = -1;
2612  nb_pcrs = 0;
2613  nb_packets = 0;
2614  for (;;) {
2615  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2616  if (ret < 0)
2617  return ret;
2618  pid = AV_RB16(data + 1) & 0x1fff;
2619  if ((pcr_pid == -1 || pcr_pid == pid) &&
2620  parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2622  pcr_pid = pid;
2623  packet_count[nb_pcrs] = nb_packets;
2624  pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2625  nb_pcrs++;
2626  if (nb_pcrs >= 2)
2627  break;
2628  } else {
2630  }
2631  nb_packets++;
2632  }
2633 
2634  /* NOTE1: the bitrate is computed without the FEC */
2635  /* NOTE2: it is only the bitrate of the start of the stream */
2636  ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2637  ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2638  s->bit_rate = TS_PACKET_SIZE * 8 * 27000000LL / ts->pcr_incr;
2639  st->codecpar->bit_rate = s->bit_rate;
2640  st->start_time = ts->cur_pcr;
2641  av_log(ts->stream, AV_LOG_TRACE, "start=%0.3f pcr=%0.3f incr=%d\n",
2642  st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2643  }
2644 
2645  seek_back(s, pb, pos);
2646  return 0;
2647 }
2648 
2649 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2650 
2652 {
2653  MpegTSContext *ts = s->priv_data;
2654  int ret, i;
2655  int64_t pcr_h, next_pcr_h, pos;
2656  int pcr_l, next_pcr_l;
2657  uint8_t pcr_buf[12];
2658  const uint8_t *data;
2659 
2660  if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2661  return AVERROR(ENOMEM);
2662  ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2663  pkt->pos = avio_tell(s->pb);
2664  if (ret < 0) {
2665  av_packet_unref(pkt);
2666  return ret;
2667  }
2668  if (data != pkt->data)
2669  memcpy(pkt->data, data, ts->raw_packet_size);
2671  if (ts->mpeg2ts_compute_pcr) {
2672  /* compute exact PCR for each packet */
2673  if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2674  /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2675  pos = avio_tell(s->pb);
2676  for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2677  avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2678  avio_read(s->pb, pcr_buf, 12);
2679  if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2680  /* XXX: not precise enough */
2681  ts->pcr_incr =
2682  ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2683  (i + 1);
2684  break;
2685  }
2686  }
2687  avio_seek(s->pb, pos, SEEK_SET);
2688  /* no next PCR found: we use previous increment */
2689  ts->cur_pcr = pcr_h * 300 + pcr_l;
2690  }
2691  pkt->pts = ts->cur_pcr;
2692  pkt->duration = ts->pcr_incr;
2693  ts->cur_pcr += ts->pcr_incr;
2694  }
2695  pkt->stream_index = 0;
2696  return 0;
2697 }
2698 
2700 {
2701  MpegTSContext *ts = s->priv_data;
2702  int ret, i;
2703 
2704  pkt->size = -1;
2705  ts->pkt = pkt;
2706  ret = handle_packets(ts, 0);
2707  if (ret < 0) {
2708  av_packet_unref(ts->pkt);
2709  /* flush pes data left */
2710  for (i = 0; i < NB_PID_MAX; i++)
2711  if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2712  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2713  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2714  ret = new_pes_packet(pes, pkt);
2715  if (ret < 0)
2716  return ret;
2717  pes->state = MPEGTS_SKIP;
2718  ret = 0;
2719  break;
2720  }
2721  }
2722  }
2723 
2724  if (!ret && pkt->size < 0)
2725  ret = AVERROR_INVALIDDATA;
2726  return ret;
2727 }
2728 
2729 static void mpegts_free(MpegTSContext *ts)
2730 {
2731  int i;
2732 
2733  clear_programs(ts);
2734 
2735  for (i = 0; i < NB_PID_MAX; i++)
2736  if (ts->pids[i])
2737  mpegts_close_filter(ts, ts->pids[i]);
2738 }
2739 
2741 {
2742  MpegTSContext *ts = s->priv_data;
2743  mpegts_free(ts);
2744  return 0;
2745 }
2746 
2747 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2748  int64_t *ppos, int64_t pos_limit)
2749 {
2750  MpegTSContext *ts = s->priv_data;
2751  int64_t pos, timestamp;
2753  int pcr_l, pcr_pid =
2754  ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2755  int pos47 = ts->pos47_full % ts->raw_packet_size;
2756  pos =
2757  ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2758  ts->raw_packet_size + pos47;
2759  while(pos < pos_limit) {
2760  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2761  return AV_NOPTS_VALUE;
2762  if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2763  return AV_NOPTS_VALUE;
2764  if (buf[0] != 0x47) {
2765  if (mpegts_resync(s, TS_PACKET_SIZE, buf) < 0)
2766  return AV_NOPTS_VALUE;
2767  pos = avio_tell(s->pb);
2768  continue;
2769  }
2770  if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2771  parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2772  *ppos = pos;
2773  return timestamp;
2774  }
2775  pos += ts->raw_packet_size;
2776  }
2777 
2778  return AV_NOPTS_VALUE;
2779 }
2780 
2781 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2782  int64_t *ppos, int64_t pos_limit)
2783 {
2784  MpegTSContext *ts = s->priv_data;
2785  int64_t pos;
2786  int pos47 = ts->pos47_full % ts->raw_packet_size;
2787  pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2789  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2790  return AV_NOPTS_VALUE;
2791  while(pos < pos_limit) {
2792  int ret;
2793  AVPacket pkt;
2794  av_init_packet(&pkt);
2795  ret = av_read_frame(s, &pkt);
2796  if (ret < 0)
2797  return AV_NOPTS_VALUE;
2798  if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2799  ff_reduce_index(s, pkt.stream_index);
2800  av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2801  if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2802  int64_t dts = pkt.dts;
2803  *ppos = pkt.pos;
2804  av_packet_unref(&pkt);
2805  return dts;
2806  }
2807  }
2808  pos = pkt.pos;
2809  av_packet_unref(&pkt);
2810  }
2811 
2812  return AV_NOPTS_VALUE;
2813 }
2814 
2815 /**************************************************************/
2816 /* parsing functions - called from other demuxers such as RTP */
2817 
2819 {
2820  MpegTSContext *ts;
2821 
2822  ts = av_mallocz(sizeof(MpegTSContext));
2823  if (!ts)
2824  return NULL;
2825  /* no stream case, currently used by RTP */
2827  ts->stream = s;
2828  ts->auto_guess = 1;
2831 
2832  return ts;
2833 }
2834 
2835 /* return the consumed length if a packet was output, or -1 if no
2836  * packet is output */
2838  const uint8_t *buf, int len)
2839 {
2840  int len1;
2841 
2842  len1 = len;
2843  ts->pkt = pkt;
2844  for (;;) {
2845  ts->stop_parse = 0;
2846  if (len < TS_PACKET_SIZE)
2847  return AVERROR_INVALIDDATA;
2848  if (buf[0] != 0x47) {
2849  buf++;
2850  len--;
2851  } else {
2852  handle_packet(ts, buf);
2853  buf += TS_PACKET_SIZE;
2854  len -= TS_PACKET_SIZE;
2855  if (ts->stop_parse == 1)
2856  break;
2857  }
2858  }
2859  return len1 - len;
2860 }
2861 
2863 {
2864  mpegts_free(ts);
2865  av_free(ts);
2866 }
2867 
2868 AVInputFormat ff_mpegts_demuxer = {
2869  .name = "mpegts",
2870  .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2871  .priv_data_size = sizeof(MpegTSContext),
2876  .read_timestamp = mpegts_get_dts,
2878  .priv_class = &mpegts_class,
2879 };
2880 
2882  .name = "mpegtsraw",
2883  .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2884  .priv_data_size = sizeof(MpegTSContext),
2888  .read_timestamp = mpegts_get_dts,
2890  .priv_class = &mpegtsraw_class,
2891 };
static void mpegts_free(MpegTSContext *ts)
Definition: mpegts.c:2729
unsigned last_crc
Definition: mpegts.c:81
int64_t probesize
Maximum size of the data read from input for determining the input container format.
Definition: avformat.h:1459
uint8_t last_sec_num
Definition: mpegts.c:588
#define NULL
Definition: coverity.c:32
#define SDT_PID
Definition: mpegts.h:37
int64_t pos47_full
Definition: mpegts.c:122
const char const char void * val
Definition: avisynth_c.h:634
int64_t last_pcr
Definition: mpegts.c:93
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
int es_id
Definition: mpegts.c:91
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define PES_START_SIZE
Definition: mpegts.c:219
#define PMT_TID
Definition: mpegts.h:41
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
Definition: buffer.c:124
#define MP4ESDescrTag
Definition: isom.h:243
int total_size
Definition: mpegts.c:235
void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id)
Definition: isom.c:434
static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
Definition: mpegts.c:2416
AVOption.
Definition: opt.h:245
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int64_t cur_pcr
used to estimate the exact PCR
Definition: mpegts.c:133
#define AV_OPT_FLAG_EXPORT
The option is inteded for exporting values to the caller.
Definition: opt.h:286
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:1900
#define MAX_PACKET_READAHEAD
Definition: mpegts.c:2649
enum AVMediaType codec_type
Definition: mpegts.c:683
int64_t dts
Definition: mpegts.c:239
static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1350
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
Definition: mpegts.c:2195
#define LIBAVUTIL_VERSION_INT
Definition: version.h:70
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1597
static void clear_program(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:274
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4404
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:217
static int mpegts_probe(AVProbeData *p)
Definition: mpegts.c:2477
#define MP4ODescrTag
Definition: isom.h:241
int8_t crc_validity[NB_PID_MAX]
Definition: mpegts.c:158
int probe_packets
Number of packets to buffer for codec probing.
Definition: avformat.h:1066
MpegTSContext * avpriv_mpegts_parse_open(AVFormatContext *s)
Definition: mpegts.c:2818
static int analyze(const uint8_t *buf, int size, int packet_size, int probe)
Definition: mpegts.c:534
union MpegTSFilter::@194 u
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3915
int64_t pts_wrap_reference
Internal data to check for wrapping of the time stamp.
Definition: avformat.h:1171
int index
stream index in AVFormatContext
Definition: avformat.h:877
int size
Definition: avcodec.h:1578
MpegTSPESFilter pes_filter
Definition: mpegts.c:96
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:213
uint8_t version
Definition: mpegts.c:586
int64_t bit_rate
Total stream bitrate in bit/s, 0 if not available.
Definition: avformat.h:1421
int size_stat_count
Definition: mpegts.c:119
#define AV_DISPOSITION_HEARING_IMPAIRED
stream for hearing impaired audiences
Definition: avformat.h:842
AVInputFormat ff_mpegts_demuxer
Definition: mpegts.c:2868
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
Definition: mpegts.c:2107
void * priv_data
Definition: avformat.h:891
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:287
#define AV_DISPOSITION_CLEAN_EFFECTS
stream without voice
Definition: avformat.h:844
#define M4OD_TID
Definition: mpegts.h:42
static int parse_section_header(SectionHeader *h, const uint8_t **pp, const uint8_t *p_end)
Definition: mpegts.c:652
discard all
Definition: avcodec.h:781
enum MpegTSFilterType type
Definition: mpegts.c:94
static AVPacket pkt
int pid
Definition: mpegts.c:224
struct Program * prg
Definition: mpegts.c:156
static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpegts.c:2699
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:688
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1368
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
int pcr_pid
if -1 then all packets containing PCR are considered
Definition: mpegts.c:225
SLConfigDescr sl
Definition: mpegts.h:94
static int mpegts_resync(AVFormatContext *s, int seekback, const uint8_t *current_packet)
Definition: mpegts.c:2359
int packet_seq_num_len
Definition: mpegts.h:87
int es_id
Definition: mpegts.h:91
int inst_bitrate_len
Definition: mpegts.h:84
unsigned int nb_prg
structure to keep track of Program->pids mapping
Definition: mpegts.c:155
#define AVFMT_SHOW_IDS
Show format stream IDs numbers.
Definition: avformat.h:478
int last_cc
Definition: mpegts.c:92
Format I/O context.
Definition: avformat.h:1319
static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size, const uint8_t **data)
Definition: mpegts.c:2391
unsigned int nb_stream_indexes
Definition: avformat.h:1257
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:72
unsigned int pids[MAX_PIDS_PER_PROGRAM]
Definition: mpegts.c:105
void ff_read_frame_flush(AVFormatContext *s)
Flush the frame reader.
Definition: utils.c:1779
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
void ff_reduce_index(AVFormatContext *s, int stream_index)
Ensure the index uses less memory than the maximum specified in AVFormatContext.max_index_size by dis...
Definition: utils.c:1828
#define SIZE_STAT_THRESHOLD
Definition: mpegts.c:120
Public dictionary API.
static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
Definition: mpegts.c:918
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
MpegTSFilter * pids[NB_PID_MAX]
filters for various streams specified by PMT + for the PAT and PMT
Definition: mpegts.c:160
static int mpegts_read_header(AVFormatContext *s)
Definition: mpegts.c:2553
AVFormatContext * s
Definition: mpegts.c:1285
uint8_t bits
Definition: crc.c:296
uint8_t
int stream_identifier
Stream Identifier This is the MPEG-TS stream identifier +1 0 means unknown.
Definition: avformat.h:1108
#define av_malloc(s)
Opaque data information usually continuous.
Definition: avutil.h:195
static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:248
enum MpegTSState state
Definition: mpegts.c:231
static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
Definition: mpegts.c:2781
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1278
AVOptions.
int size_stat[3]
Definition: mpegts.c:118
int au_seq_num_len
Definition: mpegts.h:86
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:703
int stop_parse
stop parsing loop
Definition: mpegts.c:138
static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1364
static int discard_pid(MpegTSContext *ts, unsigned int pid)
discard_pid() decides if the pid is to be discarded according to caller's programs selection ...
Definition: mpegts.c:352
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1595
static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:292
static int mpegts_push_data(MpegTSFilter *filter, const uint8_t *buf, int buf_size, int is_start, int64_t pos)
Definition: mpegts.c:990
int id
Format-specific stream ID.
Definition: avformat.h:883
enum AVStreamParseType need_parsing
Definition: avformat.h:1074
int use_au_start
Definition: mpegts.h:74
static const AVOption raw_options[]
Definition: mpegts.c:189
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4042
int pmt_pid
Definition: avformat.h:1261
static const uint8_t opus_channel_map[8][8]
Definition: mpegts.c:1594
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, uint8_t clip)
Definition: cfhd.c:80
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1387
#define TS_PACKET_SIZE
Definition: mpegts.h:29
Mp4Descr * descr
Definition: mpegts.c:1287
int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
Read size bytes from AVIOContext, returning a pointer.
Definition: aviobuf.c:607
static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
Definition: mpegts.c:1317
uint8_t * data
Definition: avcodec.h:1577
AVProgram * av_new_program(AVFormatContext *s, int id)
Definition: utils.c:4138
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:212
MpegTSState
Definition: mpegts.c:210
uint32_t tag
Definition: movenc.c:1353
#define ff_dlog(a,...)
#define AVERROR_EOF
End of file.
Definition: error.h:55
bitstream reader API header.
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
int pid
Definition: mpegts.c:90
ptrdiff_t size
Definition: opengl_enc.c:101
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:447
static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos)
Definition: mpegts.c:2544
enum AVDiscard discard
selects which program to discard and which to feed to the caller
Definition: avformat.h:1255
static int probe(AVProbeData *p)
Definition: act.c:36
static PESContext * add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
Definition: mpegts.c:1259
unsigned int * stream_index
Definition: avformat.h:1256
int scan_all_pmts
Definition: mpegts.c:147
#define av_log(a,...)
#define PAT_TID
Definition: mpegts.h:40
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:550
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3944
static MpegTSFilter * mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid, PESCallback *pes_cb, void *opaque)
Definition: mpegts.c:492
AVInputFormat ff_mpegtsraw_demuxer
Definition: mpegts.c:2881
static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf, unsigned size, Mp4Descr *descr, int max_descr_count)
Definition: mpegts.c:1295
MPEGTS stream ID, this is required to pass the stream ID information from the demuxer to the correspo...
Definition: avcodec.h:1508
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
#define AVINDEX_KEYFRAME
Definition: avformat.h:823
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:607
static uint64_t get_bits64(GetBitContext *s, int n)
Read 0-64 bits.
Definition: get_bits.h:365
enum AVCodecID codec_id
Definition: mpegts.c:684
#define AVPROBE_SCORE_STREAM_RETRY
Definition: avformat.h:467
AVBufferRef * buffer
Definition: mpegts.c:242
AVProgram * av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s)
Find the programs which belong to a given stream.
Definition: utils.c:3827
static const uint8_t opus_default_extradata[30]
Definition: opus.h:67
int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext *pb)
Definition: isom.c:459
static void reanalyze(MpegTSContext *ts)
Definition: mpegts.c:2324
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:215
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:189
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int predefined_SLConfigDescriptor_seen
Definition: mpegts.c:1292
static const StreamType HDMV_types[]
Definition: mpegts.c:709
#define AVFMT_TS_DISCONT
Format allows timestamp discontinuities.
Definition: avformat.h:486
static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:259
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
static int mpegts_read_close(AVFormatContext *s)
Definition: mpegts.c:2740
unsigned int check_crc
Definition: mpegts.c:83
static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpegts.c:2651
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
int avcodec_is_open(AVCodecContext *s)
Definition: utils.c:3910
const char * r
Definition: vf_curves.c:107
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
unsigned int nb_programs
Definition: avformat.h:1472
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:512
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3911
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1560
int pes_header_size
Definition: mpegts.c:236
simple assert() macros that are a bit more flexible than ISO C assert().
enum AVMediaType avcodec_get_type(enum AVCodecID codec_id)
Get the type of the given codec.
Definition: codec_desc.c:2964
#define TS_FEC_PACKET_SIZE
Definition: mpegts.h:27
New fields can be added to the end with minor version bumps.
Definition: avformat.h:1252
#define FFMAX(a, b)
Definition: common.h:94
static int64_t ff_parse_pes_pts(const uint8_t *buf)
Parse MPEG-PES five-byte timestamp.
Definition: mpeg.h:67
int timestamp_len
Definition: mpegts.h:81
static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1385
int flags
copied to the AVPacket flags
Definition: mpegts.c:234
int program_num
Definition: avformat.h:1260
#define MAX_SECTION_SIZE
Definition: mpegts.h:33
int pcr_incr
used to estimate the exact PCR
Definition: mpegts.c:134
int current_pid
Definition: mpegts.c:161
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1583
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3933
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:541
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:462
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:461
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1375
static const uint16_t fc[]
Definition: dcaenc.h:41
int ff_find_stream_index(AVFormatContext *s, int id)
Find stream index based on format-specific stream ID.
Definition: utils.c:4488
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:207
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:3105
int64_t ts_packet_pos
position of first TS packet of this PES packet
Definition: mpegts.c:240
SectionCallback * section_cb
Definition: mpegts.c:85
static const StreamType REGD_types[]
Definition: mpegts.c:731
void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx)
int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos)
Definition: mpegts.c:64
#define FFMIN(a, b)
Definition: common.h:96
static const StreamType MISC_types[]
Definition: mpegts.c:725
uint16_t id
Definition: mpegts.c:585
static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
Definition: mpegts.c:333
static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size, Mp4Descr *descr, int *descr_count, int max_descr_count)
Definition: mpegts.c:1507
#define TS_DVHS_PACKET_SIZE
Definition: mpegts.h:28
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
AVStream * st
Definition: mpegts.c:229
#define MP4IODescrTag
Definition: isom.h:242
AVFormatContext * stream
Definition: mpegts.c:114
int skip_changes
Definition: mpegts.c:144
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition: crc.c:357
static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:324
int ocr_len
Definition: mpegts.h:82
static int mpegts_set_stream_info(AVStream *st, PESContext *pes, uint32_t stream_type, uint32_t prog_reg_desc)
Definition: mpegts.c:780
AVDictionary * metadata
Definition: avformat.h:945
static const uint8_t opus_stream_cnt[9]
Definition: mpegts.c:1590
static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len, int target_tag)
Definition: mpegts.c:1438
#define CHECK_COUNT
static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1399
int mpeg2ts_compute_pcr
compute exact PCR for each transport stream packet
Definition: mpegts.c:128
static const AVClass mpegtsraw_class
Definition: mpegts.c:201
MpegTSSectionFilter section_filter
Definition: mpegts.c:97
static const uint8_t opus_coupled_stream_cnt[9]
Definition: mpegts.c:1586
#define CHECK_BLOCK
static uint64_t get_ts64(GetBitContext *gb, int bits)
Definition: mpegts.c:911
uint8_t sec_num
Definition: mpegts.c:587
int extended_stream_id
Definition: mpegts.c:237
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:194
int stream_type
Definition: mpegts.c:226
int auto_guess
if true, all pids are analyzed to find streams
Definition: mpegts.c:125
int raw_packet_size
raw packet size, including FEC if present
Definition: mpegts.c:116
static const StreamType ISO_types[]
Definition: mpegts.c:687
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:638
int ts_id
Transport stream id.
Definition: avformat.h:1633
#define AV_DISPOSITION_VISUAL_IMPAIRED
stream for visual impaired audiences
Definition: avformat.h:843
FILE * out
Definition: movenc-test.c:54
Stream structure.
Definition: avformat.h:876
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
FAKE codec to indicate a MPEG-4 Systems stream (only used by libavformat)
Definition: avcodec.h:643
static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
Definition: mpegts.c:2747
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
#define TS_MAX_PACKET_SIZE
Definition: mpegts.h:30
uint8_t * dec_config_descr
Definition: mpegts.h:93
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1228
unsigned int id
Definition: mpegts.c:103
#define MP4DecConfigDescrTag
Definition: isom.h:244
uint8_t stream_id
Definition: mpegts.c:238
static MpegTSFilter * mpegts_open_filter(MpegTSContext *ts, unsigned int pid, enum MpegTSFilterType type)
Definition: mpegts.c:444
AVBufferRef * av_buffer_alloc(int size)
Allocate an AVBuffer of the given size using av_malloc().
Definition: buffer.c:66
#define hex_dump_debug(class, buf, size)
Definition: internal.h:41
AVIOContext * pb
I/O context.
Definition: avformat.h:1361
static const StreamType METADATA_types[]
Definition: mpegts.c:747
int use_au_end
Definition: mpegts.h:75
static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1327
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:549
static int new_pes_packet(PESContext *pes, AVPacket *pkt)
Definition: mpegts.c:871
int resync_size
Definition: mpegts.c:149
uint8_t * data
The data buffer.
Definition: buffer.h:89
static int get_packet_size(const uint8_t *buf, int size)
Definition: mpegts.c:560
#define STREAM_TYPE_PRIVATE_DATA
Definition: mpeg.h:54
void * buf
Definition: avisynth_c.h:553
#define MAX_PES_HEADER_SIZE
Definition: mpegts.c:221
static int get8(const uint8_t **pp, const uint8_t *p_end)
Definition: mpegts.c:602
GLint GLenum type
Definition: opengl_enc.c:105
#define MAX_LEVEL
Definition: mpegts.c:1283
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:69
#define MAX_PIDS_PER_PROGRAM
Definition: mpegts.c:101
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:312
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
Definition: mpegts.c:2518
int use_timestamps
Definition: mpegts.h:78
Describe the class of an AVClass context structure.
Definition: log.h:67
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:305
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
Definition: mpegts.c:1861
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:276
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:418
int need_context_update
Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar) ...
Definition: internal.h:162
int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt, const uint8_t *buf, int len)
Definition: mpegts.c:2837
AVMediaType
Definition: avutil.h:191
refcounted data buffer API
static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
Definition: mpegts.c:513
static const StreamType DESC_types[]
Definition: mpegts.c:754
This structure contains the data a format has to probe a file.
Definition: avformat.h:459
int use_idle
Definition: mpegts.h:79
SLConfigDescr sl
Definition: mpegts.c:243
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1631
int dec_config_descr_len
Definition: mpegts.h:92
uint8_t * section_buf
Definition: mpegts.c:82
uint8_t tid
Definition: mpegts.c:584
AVDictionary * metadata
Definition: avformat.h:1258
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#define MPEGTS_OPTIONS
Definition: mpegts.c:164
static int flags
Definition: cpu.c:47
unsigned int end_of_section_reached
Definition: mpegts.c:84
static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1, const uint8_t *buf, int buf_size, int is_start)
Assemble PES packets out of TS packets, and then call the "section_cb" function when they are complet...
Definition: mpegts.c:390
int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type, const uint8_t **pp, const uint8_t *desc_list_end, Mp4Descr *mp4_descr, int mp4_descr_count, int pid, MpegTSContext *ts)
Parse an MPEG-2 descriptor.
Definition: mpegts.c:1605
static void clear_programs(MpegTSContext *ts)
Definition: mpegts.c:286
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
Definition: aviobuf.c:876
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:343
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:471
A reference to a data buffer.
Definition: buffer.h:81
static const AVOption options[]
Definition: mpegts.c:167
full parsing and repack
Definition: avformat.h:806
AVFormatContext * stream
Definition: mpegts.c:228
int skip_clear
Definition: mpegts.c:145
Main libavformat public API header.
static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
Definition: mpegts.c:2032
int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag)
Definition: isom.c:425
static const AVClass mpegts_class
Definition: mpegts.c:182
int use_rand_acc_pt
Definition: mpegts.h:76
int data_index
Definition: mpegts.c:233
if(ret< 0)
Definition: vf_mcdeint.c:282
int pts_wrap_behavior
Options for behavior, when a wrap is detected.
Definition: avformat.h:1183
int ffio_init_context(AVIOContext *s, 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))
Definition: aviobuf.c:81
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:923
static double c[64]
unsigned crc
Definition: mpegts.c:80
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:934
uint8_t header[MAX_PES_HEADER_SIZE]
Definition: mpegts.c:241
static void reset_pes_packet_state(PESContext *pes)
Definition: mpegts.c:862
#define MAX_PES_PAYLOAD
Definition: mpegts.c:45
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
int pmt_found
have we found pmt for this program
Definition: mpegts.c:108
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: avcodec.h:1610
struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1331
PESCallback * pes_cb
Definition: mpegts.c:68
static int skip_identical(const SectionHeader *h, MpegTSSectionFilter *tssf)
Definition: mpegts.c:591
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:728
static MpegTSFilter * mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid, SectionCallback *section_cb, void *opaque, int check_crc)
Definition: mpegts.c:467
FAKE codec to indicate a raw MPEG-2 TS stream (only used by libavformat)
Definition: avcodec.h:641
unsigned int nb_pids
Definition: mpegts.c:104
void * opaque
Definition: mpegts.c:69
static int get16(const uint8_t **pp, const uint8_t *p_end)
Definition: mpegts.c:615
#define av_free(p)
Mp4Descr * active_descr
Definition: mpegts.c:1288
AVPacket * pkt
packet containing Audio/Video data
Definition: mpegts.c:140
int len
#define PAT_PID
Definition: mpegts.h:36
void * priv_data
Format private data.
Definition: avformat.h:1347
int pcr_pid
Definition: avformat.h:1262
int64_t last_pos
to detect seek
Definition: mpegts.c:142
int timestamp_res
Definition: mpegts.h:80
#define AV_OPT_FLAG_READONLY
The option may not be set through the AVOptions API, only read.
Definition: opt.h:291
#define PES_HEADER_SIZE
Definition: mpegts.c:220
static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
Definition: mpegts.c:306
int64_t pts
Definition: mpegts.c:239
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3929
int use_padding
Definition: mpegts.h:77
AVCodecContext * avctx
The codec context used by avformat_find_stream_info, the parser, etc.
Definition: internal.h:151
void SetServiceCallback(void *opaque, int ret)
Definition: mpegts.c:74
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1576
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1006
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:311
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3919
static MpegTSFilter * mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
Definition: mpegts.c:508
int degr_prior_len
Definition: mpegts.h:85
static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1338
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:299
static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
Definition: mpegts.c:1523
AVIOContext pb
Definition: mpegts.c:1286
int stream_index
Definition: avcodec.h:1579
MpegTSFilterType
Definition: mpegts.c:56
#define MAX_MP4_DESCR_COUNT
Definition: mpegts.c:47
#define MKTAG(a, b, c, d)
Definition: common.h:342
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:936
static void mpegts_find_stream_type(AVStream *st, uint32_t stream_type, const StreamType *types)
Definition: mpegts.c:763
void avpriv_mpegts_parse_close(MpegTSContext *ts)
Definition: mpegts.c:2862
int au_len
Definition: mpegts.h:83
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1120
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1554
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
uint32_t stream_type
Definition: mpegts.c:682
static char * getstr8(const uint8_t **pp, const uint8_t *p_end)
Definition: mpegts.c:630
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1570
#define FFMAX3(a, b, c)
Definition: common.h:95
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240
#define av_unused
Definition: attributes.h:126
AVProgram ** programs
Definition: avformat.h:1473
#define MP4SLDescrTag
Definition: isom.h:246
int fix_teletext_pts
fix dvb teletext pts
Definition: mpegts.c:131
#define NB_PID_MAX
Definition: mpegts.h:32
static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
Definition: mpegts.c:2424
#define SDT_TID
Definition: mpegts.h:43
void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len)
Definition: mpegts.c:72
const char * name
Definition: opengl_enc.c:103
AVStream * sub_st
stream for the embedded AC3 stream in HDMV TrueHD
Definition: mpegts.c:230
MpegTSContext * ts
Definition: mpegts.c:227
static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size, Mp4Descr *descr, int *descr_count, int max_descr_count)
Definition: mpegts.c:1491