FFmpeg  2.8.15
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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_INT,
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_INT,
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_INT,
176  {.i64 = 0}, 0, 1, 0 },
177  {"skip_clear", "skip clearing programs", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
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_INT,
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 */
238  int64_t pts, dts;
239  int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
243 } PESContext;
244 
246 
247 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
248 {
249  int i;
250  for (i = 0; i < ts->nb_prg; i++) {
251  if (ts->prg[i].id == programid) {
252  return &ts->prg[i];
253  }
254  }
255  return NULL;
256 }
257 
258 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
259 {
260  AVProgram *prg = NULL;
261  int i;
262 
263  for (i = 0; i < ts->stream->nb_programs; i++)
264  if (ts->stream->programs[i]->id == programid) {
265  prg = ts->stream->programs[i];
266  break;
267  }
268  if (!prg)
269  return;
270  prg->nb_stream_indexes = 0;
271 }
272 
273 static void clear_program(MpegTSContext *ts, unsigned int programid)
274 {
275  int i;
276 
277  clear_avprogram(ts, programid);
278  for (i = 0; i < ts->nb_prg; i++)
279  if (ts->prg[i].id == programid) {
280  ts->prg[i].nb_pids = 0;
281  ts->prg[i].pmt_found = 0;
282  }
283 }
284 
286 {
287  av_freep(&ts->prg);
288  ts->nb_prg = 0;
289 }
290 
291 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
292 {
293  struct Program *p;
294  if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
295  ts->nb_prg = 0;
296  return;
297  }
298  p = &ts->prg[ts->nb_prg];
299  p->id = programid;
300  p->nb_pids = 0;
301  p->pmt_found = 0;
302  ts->nb_prg++;
303 }
304 
305 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
306  unsigned int pid)
307 {
308  struct Program *p = get_program(ts, programid);
309  int i;
310  if (!p)
311  return;
312 
313  if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
314  return;
315 
316  for (i = 0; i < p->nb_pids; i++)
317  if (p->pids[i] == pid)
318  return;
319 
320  p->pids[p->nb_pids++] = pid;
321 }
322 
323 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
324 {
325  struct Program *p = get_program(ts, programid);
326  if (!p)
327  return;
328 
329  p->pmt_found = 1;
330 }
331 
332 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
333 {
334  int i;
335  for (i = 0; i < s->nb_programs; i++) {
336  if (s->programs[i]->id == programid) {
337  s->programs[i]->pcr_pid = pid;
338  break;
339  }
340  }
341 }
342 
343 /**
344  * @brief discard_pid() decides if the pid is to be discarded according
345  * to caller's programs selection
346  * @param ts : - TS context
347  * @param pid : - pid
348  * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
349  * 0 otherwise
350  */
351 static int discard_pid(MpegTSContext *ts, unsigned int pid)
352 {
353  int i, j, k;
354  int used = 0, discarded = 0;
355  struct Program *p;
356 
357  /* If none of the programs have .discard=AVDISCARD_ALL then there's
358  * no way we have to discard this packet */
359  for (k = 0; k < ts->stream->nb_programs; k++)
360  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
361  break;
362  if (k == ts->stream->nb_programs)
363  return 0;
364 
365  for (i = 0; i < ts->nb_prg; i++) {
366  p = &ts->prg[i];
367  for (j = 0; j < p->nb_pids; j++) {
368  if (p->pids[j] != pid)
369  continue;
370  // is program with id p->id set to be discarded?
371  for (k = 0; k < ts->stream->nb_programs; k++) {
372  if (ts->stream->programs[k]->id == p->id) {
373  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
374  discarded++;
375  else
376  used++;
377  }
378  }
379  }
380  }
381 
382  return !used && discarded;
383 }
384 
385 /**
386  * Assemble PES packets out of TS packets, and then call the "section_cb"
387  * function when they are complete.
388  */
390  const uint8_t *buf, int buf_size, int is_start)
391 {
392  MpegTSSectionFilter *tss = &tss1->u.section_filter;
393  int len;
394 
395  if (is_start) {
396  memcpy(tss->section_buf, buf, buf_size);
397  tss->section_index = buf_size;
398  tss->section_h_size = -1;
399  tss->end_of_section_reached = 0;
400  } else {
401  if (tss->end_of_section_reached)
402  return;
403  len = 4096 - tss->section_index;
404  if (buf_size < len)
405  len = buf_size;
406  memcpy(tss->section_buf + tss->section_index, buf, len);
407  tss->section_index += len;
408  }
409 
410  /* compute section length if possible */
411  if (tss->section_h_size == -1 && tss->section_index >= 3) {
412  len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
413  if (len > 4096)
414  return;
415  tss->section_h_size = len;
416  }
417 
418  if (tss->section_h_size != -1 &&
419  tss->section_index >= tss->section_h_size) {
420  int crc_valid = 1;
421  tss->end_of_section_reached = 1;
422 
423  if (tss->check_crc) {
424  crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
425  if (tss->section_h_size >= 4)
426  tss->crc = AV_RB32(tss->section_buf + tss->section_h_size - 4);
427 
428  if (crc_valid) {
429  ts->crc_validity[ tss1->pid ] = 100;
430  }else if (ts->crc_validity[ tss1->pid ] > -10) {
431  ts->crc_validity[ tss1->pid ]--;
432  }else
433  crc_valid = 2;
434  }
435  if (crc_valid) {
436  tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
437  if (crc_valid != 1)
438  tss->last_ver = -1;
439  }
440  }
441 }
442 
443 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
444  enum MpegTSFilterType type)
445 {
447 
448  av_log(ts->stream, AV_LOG_TRACE, "Filter: pid=0x%x\n", pid);
449 
450  if (pid >= NB_PID_MAX || ts->pids[pid])
451  return NULL;
452  filter = av_mallocz(sizeof(MpegTSFilter));
453  if (!filter)
454  return NULL;
455  ts->pids[pid] = filter;
456 
457  filter->type = type;
458  filter->pid = pid;
459  filter->es_id = -1;
460  filter->last_cc = -1;
461  filter->last_pcr= -1;
462 
463  return filter;
464 }
465 
467  unsigned int pid,
468  SectionCallback *section_cb,
469  void *opaque,
470  int check_crc)
471 {
473  MpegTSSectionFilter *sec;
474 
475  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
476  return NULL;
477  sec = &filter->u.section_filter;
478  sec->section_cb = section_cb;
479  sec->opaque = opaque;
481  sec->check_crc = check_crc;
482  sec->last_ver = -1;
483 
484  if (!sec->section_buf) {
485  av_free(filter);
486  return NULL;
487  }
488  return filter;
489 }
490 
491 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
492  PESCallback *pes_cb,
493  void *opaque)
494 {
496  MpegTSPESFilter *pes;
497 
498  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
499  return NULL;
500 
501  pes = &filter->u.pes_filter;
502  pes->pes_cb = pes_cb;
503  pes->opaque = opaque;
504  return filter;
505 }
506 
507 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
508 {
509  return mpegts_open_filter(ts, pid, MPEGTS_PCR);
510 }
511 
513 {
514  int pid;
515 
516  pid = filter->pid;
517  if (filter->type == MPEGTS_SECTION)
519  else if (filter->type == MPEGTS_PES) {
520  PESContext *pes = filter->u.pes_filter.opaque;
521  av_buffer_unref(&pes->buffer);
522  /* referenced private data will be freed later in
523  * avformat_close_input */
524  if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
525  av_freep(&filter->u.pes_filter.opaque);
526  }
527  }
528 
529  av_free(filter);
530  ts->pids[pid] = NULL;
531 }
532 
533 static int analyze(const uint8_t *buf, int size, int packet_size, int *index,
534  int probe)
535 {
536  int stat[TS_MAX_PACKET_SIZE];
537  int stat_all = 0;
538  int i;
539  int best_score = 0;
540 
541  memset(stat, 0, packet_size * sizeof(*stat));
542 
543  for (i = 0; i < size - 3; i++) {
544  if (buf[i] == 0x47 &&
545  (!probe || (!(buf[i + 1] & 0x80) && buf[i + 3] != 0x47))) {
546  int x = i % packet_size;
547  stat[x]++;
548  stat_all++;
549  if (stat[x] > best_score) {
550  best_score = stat[x];
551  if (index)
552  *index = x;
553  }
554  }
555  }
556 
557  return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
558 }
559 
560 /* autodetect fec presence. Must have at least 1024 bytes */
561 static int get_packet_size(const uint8_t *buf, int size)
562 {
563  int score, fec_score, dvhs_score;
564 
565  if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
566  return AVERROR_INVALIDDATA;
567 
568  score = analyze(buf, size, TS_PACKET_SIZE, NULL, 0);
569  dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL, 0);
570  fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL, 0);
571  av_log(NULL, AV_LOG_TRACE, "score: %d, dvhs_score: %d, fec_score: %d \n",
572  score, dvhs_score, fec_score);
573 
574  if (score > fec_score && score > dvhs_score)
575  return TS_PACKET_SIZE;
576  else if (dvhs_score > score && dvhs_score > fec_score)
577  return TS_DVHS_PACKET_SIZE;
578  else if (score < fec_score && dvhs_score < fec_score)
579  return TS_FEC_PACKET_SIZE;
580  else
581  return AVERROR_INVALIDDATA;
582 }
583 
584 typedef struct SectionHeader {
586  uint16_t id;
590 } SectionHeader;
591 
593 {
594  if (h->version == tssf->last_ver && tssf->last_crc == tssf->crc)
595  return 1;
596 
597  tssf->last_ver = h->version;
598  tssf->last_crc = tssf->crc;
599 
600  return 0;
601 }
602 
603 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
604 {
605  const uint8_t *p;
606  int c;
607 
608  p = *pp;
609  if (p >= p_end)
610  return AVERROR_INVALIDDATA;
611  c = *p++;
612  *pp = p;
613  return c;
614 }
615 
616 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
617 {
618  const uint8_t *p;
619  int c;
620 
621  p = *pp;
622  if (1 >= p_end - p)
623  return AVERROR_INVALIDDATA;
624  c = AV_RB16(p);
625  p += 2;
626  *pp = p;
627  return c;
628 }
629 
630 /* read and allocate a DVB string preceded by its length */
631 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
632 {
633  int len;
634  const uint8_t *p;
635  char *str;
636 
637  p = *pp;
638  len = get8(&p, p_end);
639  if (len < 0)
640  return NULL;
641  if (len > p_end - p)
642  return NULL;
643  str = av_malloc(len + 1);
644  if (!str)
645  return NULL;
646  memcpy(str, p, len);
647  str[len] = '\0';
648  p += len;
649  *pp = p;
650  return str;
651 }
652 
654  const uint8_t **pp, const uint8_t *p_end)
655 {
656  int val;
657 
658  val = get8(pp, p_end);
659  if (val < 0)
660  return val;
661  h->tid = val;
662  *pp += 2;
663  val = get16(pp, p_end);
664  if (val < 0)
665  return val;
666  h->id = val;
667  val = get8(pp, p_end);
668  if (val < 0)
669  return val;
670  h->version = (val >> 1) & 0x1f;
671  val = get8(pp, p_end);
672  if (val < 0)
673  return val;
674  h->sec_num = val;
675  val = get8(pp, p_end);
676  if (val < 0)
677  return val;
678  h->last_sec_num = val;
679  return 0;
680 }
681 
682 typedef struct StreamType {
683  uint32_t stream_type;
686 } StreamType;
687 
688 static const StreamType ISO_types[] = {
695  /* Makito encoder sets stream type 0x11 for AAC,
696  * so auto-detect LOAS/LATM instead of hardcoding it. */
697 #if !CONFIG_LOAS_DEMUXER
698  { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
699 #endif
707  { 0 },
708 };
709 
710 static const StreamType HDMV_types[] = {
716  { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
717  { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
718  { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
719  { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
722  { 0 },
723 };
724 
725 /* ATSC ? */
726 static const StreamType MISC_types[] = {
729  { 0 },
730 };
731 
732 static const StreamType REGD_types[] = {
733  { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
734  { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
735  { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
736  { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
737  { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
738  { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
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('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
742  { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
743  { 0 },
744 };
745 
746 static const StreamType METADATA_types[] = {
747  { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
748  { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
749  { 0 },
750 };
751 
752 /* descriptor present */
753 static const StreamType DESC_types[] = {
754  { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
755  { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
758  { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
759  { 0 },
760 };
761 
763  uint32_t stream_type,
764  const StreamType *types)
765 {
766  if (avcodec_is_open(st->codec)) {
767  av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
768  return;
769  }
770 
771  for (; types->stream_type; types++)
772  if (stream_type == types->stream_type) {
773  st->codec->codec_type = types->codec_type;
774  st->codec->codec_id = types->codec_id;
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->codec->codec_type;
784  int old_codec_id = st->codec->codec_id;
785 
786  if (avcodec_is_open(st->codec)) {
787  av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
788  return 0;
789  }
790 
791  avpriv_set_pts_info(st, 33, 1, 90000);
792  st->priv_data = pes;
796  pes->st = st;
797  pes->stream_type = stream_type;
798 
799  av_log(pes->stream, AV_LOG_DEBUG,
800  "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
801  st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
802 
803  st->codec->codec_tag = pes->stream_type;
804 
805  mpegts_find_stream_type(st, pes->stream_type, ISO_types);
806  if ((prog_reg_desc == AV_RL32("HDMV") ||
807  prog_reg_desc == AV_RL32("HDPR")) &&
808  st->codec->codec_id == AV_CODEC_ID_NONE) {
809  mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
810  if (pes->stream_type == 0x83) {
811  // HDMV TrueHD streams also contain an AC3 coded version of the
812  // audio track - add a second stream for this
813  AVStream *sub_st;
814  // priv_data cannot be shared between streams
815  PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
816  if (!sub_pes)
817  return AVERROR(ENOMEM);
818  memcpy(sub_pes, pes, sizeof(*sub_pes));
819 
820  sub_st = avformat_new_stream(pes->stream, NULL);
821  if (!sub_st) {
822  av_free(sub_pes);
823  return AVERROR(ENOMEM);
824  }
825 
826  sub_st->id = pes->pid;
827  avpriv_set_pts_info(sub_st, 33, 1, 90000);
828  sub_st->priv_data = sub_pes;
830  sub_st->codec->codec_id = AV_CODEC_ID_AC3;
832  sub_pes->sub_st = pes->sub_st = sub_st;
833  }
834  }
835  if (st->codec->codec_id == AV_CODEC_ID_NONE)
836  mpegts_find_stream_type(st, pes->stream_type, MISC_types);
837  if (st->codec->codec_id == AV_CODEC_ID_NONE) {
838  st->codec->codec_id = old_codec_id;
839  st->codec->codec_type = old_codec_type;
840  }
841  if ((st->codec->codec_id == AV_CODEC_ID_NONE ||
842  (st->request_probe > 0 && st->request_probe < AVPROBE_SCORE_STREAM_RETRY / 5)) &&
843  !avcodec_is_open(st->codec) &&
844  st->probe_packets > 0 &&
845  stream_type == STREAM_TYPE_PRIVATE_DATA) {
849  }
850 
851  return 0;
852 }
853 
855 {
856  pes->pts = AV_NOPTS_VALUE;
857  pes->dts = AV_NOPTS_VALUE;
858  pes->data_index = 0;
859  pes->flags = 0;
860  av_buffer_unref(&pes->buffer);
861 }
862 
864 {
865  av_init_packet(pkt);
866 
867  pkt->buf = pes->buffer;
868  pkt->data = pes->buffer->data;
869  pkt->size = pes->data_index;
870 
871  if (pes->total_size != MAX_PES_PAYLOAD &&
872  pes->pes_header_size + pes->data_index != pes->total_size +
873  PES_START_SIZE) {
874  av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
875  pes->flags |= AV_PKT_FLAG_CORRUPT;
876  }
877  memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
878 
879  // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
880  if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
881  pkt->stream_index = pes->sub_st->index;
882  else
883  pkt->stream_index = pes->st->index;
884  pkt->pts = pes->pts;
885  pkt->dts = pes->dts;
886  /* store position of first TS packet of this PES packet */
887  pkt->pos = pes->ts_packet_pos;
888  pkt->flags = pes->flags;
889 
890  pes->buffer = NULL;
892 }
893 
894 static uint64_t get_ts64(GetBitContext *gb, int bits)
895 {
896  if (get_bits_left(gb) < bits)
897  return AV_NOPTS_VALUE;
898  return get_bits64(gb, bits);
899 }
900 
902  const uint8_t *buf, int buf_size)
903 {
904  GetBitContext gb;
905  int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
906  int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
907  int dts_flag = -1, cts_flag = -1;
908  int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
909  uint8_t buf_padded[128 + AV_INPUT_BUFFER_PADDING_SIZE];
910  int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - AV_INPUT_BUFFER_PADDING_SIZE);
911 
912  memcpy(buf_padded, buf, buf_padded_size);
913 
914  init_get_bits(&gb, buf_padded, buf_padded_size * 8);
915 
916  if (sl->use_au_start)
917  au_start_flag = get_bits1(&gb);
918  if (sl->use_au_end)
919  au_end_flag = get_bits1(&gb);
920  if (!sl->use_au_start && !sl->use_au_end)
921  au_start_flag = au_end_flag = 1;
922  if (sl->ocr_len > 0)
923  ocr_flag = get_bits1(&gb);
924  if (sl->use_idle)
925  idle_flag = get_bits1(&gb);
926  if (sl->use_padding)
927  padding_flag = get_bits1(&gb);
928  if (padding_flag)
929  padding_bits = get_bits(&gb, 3);
930 
931  if (!idle_flag && (!padding_flag || padding_bits != 0)) {
932  if (sl->packet_seq_num_len)
934  if (sl->degr_prior_len)
935  if (get_bits1(&gb))
936  skip_bits(&gb, sl->degr_prior_len);
937  if (ocr_flag)
938  skip_bits_long(&gb, sl->ocr_len);
939  if (au_start_flag) {
940  if (sl->use_rand_acc_pt)
941  get_bits1(&gb);
942  if (sl->au_seq_num_len > 0)
943  skip_bits_long(&gb, sl->au_seq_num_len);
944  if (sl->use_timestamps) {
945  dts_flag = get_bits1(&gb);
946  cts_flag = get_bits1(&gb);
947  }
948  }
949  if (sl->inst_bitrate_len)
950  inst_bitrate_flag = get_bits1(&gb);
951  if (dts_flag == 1)
952  dts = get_ts64(&gb, sl->timestamp_len);
953  if (cts_flag == 1)
954  cts = get_ts64(&gb, sl->timestamp_len);
955  if (sl->au_len > 0)
956  skip_bits_long(&gb, sl->au_len);
957  if (inst_bitrate_flag)
959  }
960 
961  if (dts != AV_NOPTS_VALUE)
962  pes->dts = dts;
963  if (cts != AV_NOPTS_VALUE)
964  pes->pts = cts;
965 
966  if (sl->timestamp_len && sl->timestamp_res)
968 
969  return (get_bits_count(&gb) + 7) >> 3;
970 }
971 
972 /* return non zero if a packet could be constructed */
974  const uint8_t *buf, int buf_size, int is_start,
975  int64_t pos)
976 {
977  PESContext *pes = filter->u.pes_filter.opaque;
978  MpegTSContext *ts = pes->ts;
979  const uint8_t *p;
980  int len, code;
981 
982  if (!ts->pkt)
983  return 0;
984 
985  if (is_start) {
986  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
987  new_pes_packet(pes, ts->pkt);
988  ts->stop_parse = 1;
989  } else {
991  }
992  pes->state = MPEGTS_HEADER;
993  pes->ts_packet_pos = pos;
994  }
995  p = buf;
996  while (buf_size > 0) {
997  switch (pes->state) {
998  case MPEGTS_HEADER:
999  len = PES_START_SIZE - pes->data_index;
1000  if (len > buf_size)
1001  len = buf_size;
1002  memcpy(pes->header + pes->data_index, p, len);
1003  pes->data_index += len;
1004  p += len;
1005  buf_size -= len;
1006  if (pes->data_index == PES_START_SIZE) {
1007  /* we got all the PES or section header. We can now
1008  * decide */
1009  if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
1010  pes->header[2] == 0x01) {
1011  /* it must be an mpeg2 PES stream */
1012  code = pes->header[3] | 0x100;
1013  av_log(pes->stream, AV_LOG_TRACE, "pid=%x pes_code=%#x\n", pes->pid,
1014  code);
1015 
1016  if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
1017  (!pes->sub_st ||
1018  pes->sub_st->discard == AVDISCARD_ALL)) ||
1019  code == 0x1be) /* padding_stream */
1020  goto skip;
1021 
1022  /* stream not present in PMT */
1023  if (!pes->st) {
1024  if (ts->skip_changes)
1025  goto skip;
1026 
1027  pes->st = avformat_new_stream(ts->stream, NULL);
1028  if (!pes->st)
1029  return AVERROR(ENOMEM);
1030  pes->st->id = pes->pid;
1031  mpegts_set_stream_info(pes->st, pes, 0, 0);
1032  }
1033 
1034  pes->total_size = AV_RB16(pes->header + 4);
1035  /* NOTE: a zero total size means the PES size is
1036  * unbounded */
1037  if (!pes->total_size)
1038  pes->total_size = MAX_PES_PAYLOAD;
1039 
1040  /* allocate pes buffer */
1041  pes->buffer = av_buffer_alloc(pes->total_size +
1043  if (!pes->buffer)
1044  return AVERROR(ENOMEM);
1045 
1046  if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1047  code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1048  code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1049  code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1050  pes->state = MPEGTS_PESHEADER;
1051  if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1052  av_log(pes->stream, AV_LOG_TRACE,
1053  "pid=%x stream_type=%x probing\n",
1054  pes->pid,
1055  pes->stream_type);
1056  pes->st->request_probe = 1;
1057  }
1058  } else {
1059  pes->pes_header_size = 6;
1060  pes->state = MPEGTS_PAYLOAD;
1061  pes->data_index = 0;
1062  }
1063  } else {
1064  /* otherwise, it should be a table */
1065  /* skip packet */
1066 skip:
1067  pes->state = MPEGTS_SKIP;
1068  continue;
1069  }
1070  }
1071  break;
1072  /**********************************************/
1073  /* PES packing parsing */
1074  case MPEGTS_PESHEADER:
1075  len = PES_HEADER_SIZE - pes->data_index;
1076  if (len < 0)
1077  return AVERROR_INVALIDDATA;
1078  if (len > buf_size)
1079  len = buf_size;
1080  memcpy(pes->header + pes->data_index, p, len);
1081  pes->data_index += len;
1082  p += len;
1083  buf_size -= len;
1084  if (pes->data_index == PES_HEADER_SIZE) {
1085  pes->pes_header_size = pes->header[8] + 9;
1087  }
1088  break;
1089  case MPEGTS_PESHEADER_FILL:
1090  len = pes->pes_header_size - pes->data_index;
1091  if (len < 0)
1092  return AVERROR_INVALIDDATA;
1093  if (len > buf_size)
1094  len = buf_size;
1095  memcpy(pes->header + pes->data_index, p, len);
1096  pes->data_index += len;
1097  p += len;
1098  buf_size -= len;
1099  if (pes->data_index == pes->pes_header_size) {
1100  const uint8_t *r;
1101  unsigned int flags, pes_ext, skip;
1102 
1103  flags = pes->header[7];
1104  r = pes->header + 9;
1105  pes->pts = AV_NOPTS_VALUE;
1106  pes->dts = AV_NOPTS_VALUE;
1107  if ((flags & 0xc0) == 0x80) {
1108  pes->dts = pes->pts = ff_parse_pes_pts(r);
1109  r += 5;
1110  } else if ((flags & 0xc0) == 0xc0) {
1111  pes->pts = ff_parse_pes_pts(r);
1112  r += 5;
1113  pes->dts = ff_parse_pes_pts(r);
1114  r += 5;
1115  }
1116  pes->extended_stream_id = -1;
1117  if (flags & 0x01) { /* PES extension */
1118  pes_ext = *r++;
1119  /* Skip PES private data, program packet sequence counter and P-STD buffer */
1120  skip = (pes_ext >> 4) & 0xb;
1121  skip += skip & 0x9;
1122  r += skip;
1123  if ((pes_ext & 0x41) == 0x01 &&
1124  (r + 2) <= (pes->header + pes->pes_header_size)) {
1125  /* PES extension 2 */
1126  if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1127  pes->extended_stream_id = r[1];
1128  }
1129  }
1130 
1131  /* we got the full header. We parse it and get the payload */
1132  pes->state = MPEGTS_PAYLOAD;
1133  pes->data_index = 0;
1134  if (pes->stream_type == 0x12 && buf_size > 0) {
1135  int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1136  buf_size);
1137  pes->pes_header_size += sl_header_bytes;
1138  p += sl_header_bytes;
1139  buf_size -= sl_header_bytes;
1140  }
1141  if (pes->stream_type == 0x15 && buf_size >= 5) {
1142  /* skip metadata access unit header */
1143  pes->pes_header_size += 5;
1144  p += 5;
1145  buf_size -= 5;
1146  }
1147  if ( pes->ts->fix_teletext_pts
1148  && ( pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT
1150  ) {
1151  AVProgram *p = NULL;
1152  while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1153  if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1154  MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1155  if (f) {
1156  AVStream *st = NULL;
1157  if (f->type == MPEGTS_PES) {
1158  PESContext *pcrpes = f->u.pes_filter.opaque;
1159  if (pcrpes)
1160  st = pcrpes->st;
1161  } else if (f->type == MPEGTS_PCR) {
1162  int i;
1163  for (i = 0; i < p->nb_stream_indexes; i++) {
1164  AVStream *pst = pes->stream->streams[p->stream_index[i]];
1165  if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1166  st = pst;
1167  }
1168  }
1169  if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1170  // teletext packets do not always have correct timestamps,
1171  // the standard says they should be handled after 40.6 ms at most,
1172  // and the pcr error to this packet should be no more than 100 ms.
1173  // TODO: we should interpolate the PCR, not just use the last one
1174  int64_t pcr = f->last_pcr / 300;
1177  if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1178  pes->pts = pes->dts = pcr;
1179  } else if (pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT &&
1180  pes->dts > pcr + 3654 + 9000) {
1181  pes->pts = pes->dts = pcr + 3654 + 9000;
1182  } else if (pes->st->codec->codec_id == AV_CODEC_ID_DVB_SUBTITLE &&
1183  pes->dts > pcr + 10*90000) { //10sec
1184  pes->pts = pes->dts = pcr + 3654 + 9000;
1185  }
1186  break;
1187  }
1188  }
1189  }
1190  }
1191  }
1192  }
1193  break;
1194  case MPEGTS_PAYLOAD:
1195  if (pes->buffer) {
1196  if (pes->data_index > 0 &&
1197  pes->data_index + buf_size > pes->total_size) {
1198  new_pes_packet(pes, ts->pkt);
1199  pes->total_size = MAX_PES_PAYLOAD;
1200  pes->buffer = av_buffer_alloc(pes->total_size +
1202  if (!pes->buffer)
1203  return AVERROR(ENOMEM);
1204  ts->stop_parse = 1;
1205  } else if (pes->data_index == 0 &&
1206  buf_size > pes->total_size) {
1207  // pes packet size is < ts size packet and pes data is padded with 0xff
1208  // not sure if this is legal in ts but see issue #2392
1209  buf_size = pes->total_size;
1210  }
1211  memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1212  pes->data_index += buf_size;
1213  /* emit complete packets with known packet size
1214  * decreases demuxer delay for infrequent packets like subtitles from
1215  * a couple of seconds to milliseconds for properly muxed files.
1216  * total_size is the number of bytes following pes_packet_length
1217  * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1218  if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1219  pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1220  ts->stop_parse = 1;
1221  new_pes_packet(pes, ts->pkt);
1222  }
1223  }
1224  buf_size = 0;
1225  break;
1226  case MPEGTS_SKIP:
1227  buf_size = 0;
1228  break;
1229  }
1230  }
1231 
1232  return 0;
1233 }
1234 
1235 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1236 {
1237  MpegTSFilter *tss;
1238  PESContext *pes;
1239 
1240  /* if no pid found, then add a pid context */
1241  pes = av_mallocz(sizeof(PESContext));
1242  if (!pes)
1243  return 0;
1244  pes->ts = ts;
1245  pes->stream = ts->stream;
1246  pes->pid = pid;
1247  pes->pcr_pid = pcr_pid;
1248  pes->state = MPEGTS_SKIP;
1249  pes->pts = AV_NOPTS_VALUE;
1250  pes->dts = AV_NOPTS_VALUE;
1251  tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1252  if (!tss) {
1253  av_free(pes);
1254  return 0;
1255  }
1256  return pes;
1257 }
1258 
1259 #define MAX_LEVEL 4
1260 typedef struct MP4DescrParseContext {
1267  int level;
1270 
1272  const uint8_t *buf, unsigned size,
1273  Mp4Descr *descr, int max_descr_count)
1274 {
1275  int ret;
1276  if (size > (1 << 30))
1277  return AVERROR_INVALIDDATA;
1278 
1279  if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1280  NULL, NULL, NULL, NULL)) < 0)
1281  return ret;
1282 
1283  d->s = s;
1284  d->level = 0;
1285  d->descr_count = 0;
1286  d->descr = descr;
1287  d->active_descr = NULL;
1288  d->max_descr_count = max_descr_count;
1289 
1290  return 0;
1291 }
1292 
1293 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1294 {
1295  int64_t new_off = avio_tell(pb);
1296  (*len) -= new_off - *off;
1297  *off = new_off;
1298 }
1299 
1300 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1301  int target_tag);
1302 
1303 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1304 {
1305  while (len > 0) {
1306  int ret = parse_mp4_descr(d, off, len, 0);
1307  if (ret < 0)
1308  return ret;
1309  update_offsets(&d->pb, &off, &len);
1310  }
1311  return 0;
1312 }
1313 
1314 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1315 {
1316  avio_rb16(&d->pb); // ID
1317  avio_r8(&d->pb);
1318  avio_r8(&d->pb);
1319  avio_r8(&d->pb);
1320  avio_r8(&d->pb);
1321  avio_r8(&d->pb);
1322  update_offsets(&d->pb, &off, &len);
1323  return parse_mp4_descr_arr(d, off, len);
1324 }
1325 
1326 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1327 {
1328  int id_flags;
1329  if (len < 2)
1330  return 0;
1331  id_flags = avio_rb16(&d->pb);
1332  if (!(id_flags & 0x0020)) { // URL_Flag
1333  update_offsets(&d->pb, &off, &len);
1334  return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1335  } else {
1336  return 0;
1337  }
1338 }
1339 
1340 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1341 {
1342  int es_id = 0;
1343  if (d->descr_count >= d->max_descr_count)
1344  return AVERROR_INVALIDDATA;
1345  ff_mp4_parse_es_descr(&d->pb, &es_id);
1346  d->active_descr = d->descr + (d->descr_count++);
1347 
1348  d->active_descr->es_id = es_id;
1349  update_offsets(&d->pb, &off, &len);
1350  parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1351  update_offsets(&d->pb, &off, &len);
1352  if (len > 0)
1353  parse_mp4_descr(d, off, len, MP4SLDescrTag);
1354  d->active_descr = NULL;
1355  return 0;
1356 }
1357 
1359  int len)
1360 {
1361  Mp4Descr *descr = d->active_descr;
1362  if (!descr)
1363  return AVERROR_INVALIDDATA;
1365  if (!descr->dec_config_descr)
1366  return AVERROR(ENOMEM);
1367  descr->dec_config_descr_len = len;
1368  avio_read(&d->pb, descr->dec_config_descr, len);
1369  return 0;
1370 }
1371 
1372 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1373 {
1374  Mp4Descr *descr = d->active_descr;
1375  int predefined;
1376  if (!descr)
1377  return AVERROR_INVALIDDATA;
1378 
1379  predefined = avio_r8(&d->pb);
1380  if (!predefined) {
1381  int lengths;
1382  int flags = avio_r8(&d->pb);
1383  descr->sl.use_au_start = !!(flags & 0x80);
1384  descr->sl.use_au_end = !!(flags & 0x40);
1385  descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1386  descr->sl.use_padding = !!(flags & 0x08);
1387  descr->sl.use_timestamps = !!(flags & 0x04);
1388  descr->sl.use_idle = !!(flags & 0x02);
1389  descr->sl.timestamp_res = avio_rb32(&d->pb);
1390  avio_rb32(&d->pb);
1391  descr->sl.timestamp_len = avio_r8(&d->pb);
1392  if (descr->sl.timestamp_len > 64) {
1393  avpriv_request_sample(NULL, "timestamp_len > 64");
1394  descr->sl.timestamp_len = 64;
1395  return AVERROR_PATCHWELCOME;
1396  }
1397  descr->sl.ocr_len = avio_r8(&d->pb);
1398  descr->sl.au_len = avio_r8(&d->pb);
1399  descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1400  lengths = avio_rb16(&d->pb);
1401  descr->sl.degr_prior_len = lengths >> 12;
1402  descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1403  descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1404  } else if (!d->predefined_SLConfigDescriptor_seen){
1405  avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1407  }
1408  return 0;
1409 }
1410 
1411 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1412  int target_tag)
1413 {
1414  int tag;
1415  int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1416  update_offsets(&d->pb, &off, &len);
1417  if (len < 0 || len1 > len || len1 <= 0) {
1418  av_log(d->s, AV_LOG_ERROR,
1419  "Tag %x length violation new length %d bytes remaining %d\n",
1420  tag, len1, len);
1421  return AVERROR_INVALIDDATA;
1422  }
1423 
1424  if (d->level++ >= MAX_LEVEL) {
1425  av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1426  goto done;
1427  }
1428 
1429  if (target_tag && tag != target_tag) {
1430  av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1431  target_tag);
1432  goto done;
1433  }
1434 
1435  switch (tag) {
1436  case MP4IODescrTag:
1437  parse_MP4IODescrTag(d, off, len1);
1438  break;
1439  case MP4ODescrTag:
1440  parse_MP4ODescrTag(d, off, len1);
1441  break;
1442  case MP4ESDescrTag:
1443  parse_MP4ESDescrTag(d, off, len1);
1444  break;
1445  case MP4DecConfigDescrTag:
1446  parse_MP4DecConfigDescrTag(d, off, len1);
1447  break;
1448  case MP4SLDescrTag:
1449  parse_MP4SLDescrTag(d, off, len1);
1450  break;
1451  }
1452 
1453 
1454 done:
1455  d->level--;
1456  avio_seek(&d->pb, off + len1, SEEK_SET);
1457  return 0;
1458 }
1459 
1460 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1461  Mp4Descr *descr, int *descr_count, int max_descr_count)
1462 {
1464  int ret;
1465 
1466  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1467  if (ret < 0)
1468  return ret;
1469 
1470  ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1471 
1472  *descr_count = d.descr_count;
1473  return ret;
1474 }
1475 
1476 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1477  Mp4Descr *descr, int *descr_count, int max_descr_count)
1478 {
1480  int ret;
1481 
1482  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1483  if (ret < 0)
1484  return ret;
1485 
1486  ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1487 
1488  *descr_count = d.descr_count;
1489  return ret;
1490 }
1491 
1493  int section_len)
1494 {
1495  MpegTSContext *ts = filter->u.section_filter.opaque;
1496  MpegTSSectionFilter *tssf = &filter->u.section_filter;
1497  SectionHeader h;
1498  const uint8_t *p, *p_end;
1499  AVIOContext pb;
1500  int mp4_descr_count = 0;
1501  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1502  int i, pid;
1503  AVFormatContext *s = ts->stream;
1504 
1505  p_end = section + section_len - 4;
1506  p = section;
1507  if (parse_section_header(&h, &p, p_end) < 0)
1508  return;
1509  if (h.tid != M4OD_TID)
1510  return;
1511  if (skip_identical(&h, tssf))
1512  return;
1513 
1514  mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1516 
1517  for (pid = 0; pid < NB_PID_MAX; pid++) {
1518  if (!ts->pids[pid])
1519  continue;
1520  for (i = 0; i < mp4_descr_count; i++) {
1521  PESContext *pes;
1522  AVStream *st;
1523  if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1524  continue;
1525  if (ts->pids[pid]->type != MPEGTS_PES) {
1526  av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1527  continue;
1528  }
1529  pes = ts->pids[pid]->u.pes_filter.opaque;
1530  st = pes->st;
1531  if (!st)
1532  continue;
1533 
1534  pes->sl = mp4_descr[i].sl;
1535 
1536  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1537  mp4_descr[i].dec_config_descr_len, 0,
1538  NULL, NULL, NULL, NULL);
1539  ff_mp4_read_dec_config_descr(s, st, &pb);
1540  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1541  st->codec->extradata_size > 0)
1542  st->need_parsing = 0;
1543  if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1544  st->codec->extradata_size > 0)
1545  st->need_parsing = 0;
1546 
1547  if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1548  // do nothing
1549  } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1551  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1553  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1555  }
1556  }
1557  for (i = 0; i < mp4_descr_count; i++)
1558  av_free(mp4_descr[i].dec_config_descr);
1559 }
1560 
1562  1, 0, 1, 1, 2, 2, 2, 3, 3
1563 };
1564 
1565 static const uint8_t opus_stream_cnt[9] = {
1566  1, 1, 1, 2, 2, 3, 4, 4, 5,
1567 };
1568 
1569 static const uint8_t opus_channel_map[8][8] = {
1570  { 0 },
1571  { 0,1 },
1572  { 0,2,1 },
1573  { 0,1,2,3 },
1574  { 0,4,1,2,3 },
1575  { 0,4,1,2,3,5 },
1576  { 0,4,1,2,3,5,6 },
1577  { 0,6,1,2,3,4,5,7 },
1578 };
1579 
1581  const uint8_t **pp, const uint8_t *desc_list_end,
1582  Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1583  MpegTSContext *ts)
1584 {
1585  const uint8_t *desc_end;
1586  int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1587  char language[252];
1588  int i;
1589 
1590  desc_tag = get8(pp, desc_list_end);
1591  if (desc_tag < 0)
1592  return AVERROR_INVALIDDATA;
1593  desc_len = get8(pp, desc_list_end);
1594  if (desc_len < 0)
1595  return AVERROR_INVALIDDATA;
1596  desc_end = *pp + desc_len;
1597  if (desc_end > desc_list_end)
1598  return AVERROR_INVALIDDATA;
1599 
1600  av_log(fc, AV_LOG_TRACE, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1601 
1602  if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1603  stream_type == STREAM_TYPE_PRIVATE_DATA)
1604  mpegts_find_stream_type(st, desc_tag, DESC_types);
1605 
1606  switch (desc_tag) {
1607  case 0x1E: /* SL descriptor */
1608  desc_es_id = get16(pp, desc_end);
1609  if (desc_es_id < 0)
1610  break;
1611  if (ts && ts->pids[pid])
1612  ts->pids[pid]->es_id = desc_es_id;
1613  for (i = 0; i < mp4_descr_count; i++)
1614  if (mp4_descr[i].dec_config_descr_len &&
1615  mp4_descr[i].es_id == desc_es_id) {
1616  AVIOContext pb;
1617  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1618  mp4_descr[i].dec_config_descr_len, 0,
1619  NULL, NULL, NULL, NULL);
1620  ff_mp4_read_dec_config_descr(fc, st, &pb);
1621  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1622  st->codec->extradata_size > 0)
1623  st->need_parsing = 0;
1625  mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1626  }
1627  break;
1628  case 0x1F: /* FMC descriptor */
1629  if (get16(pp, desc_end) < 0)
1630  break;
1631  if (mp4_descr_count > 0 &&
1632  (st->codec->codec_id == AV_CODEC_ID_AAC_LATM ||
1633  (st->request_probe == 0 && st->codec->codec_id == AV_CODEC_ID_NONE) ||
1634  st->request_probe > 0) &&
1635  mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1636  AVIOContext pb;
1637  ffio_init_context(&pb, mp4_descr->dec_config_descr,
1638  mp4_descr->dec_config_descr_len, 0,
1639  NULL, NULL, NULL, NULL);
1640  ff_mp4_read_dec_config_descr(fc, st, &pb);
1641  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1642  st->codec->extradata_size > 0) {
1643  st->request_probe = st->need_parsing = 0;
1645  }
1646  }
1647  break;
1648  case 0x56: /* DVB teletext descriptor */
1649  {
1650  uint8_t *extradata = NULL;
1651  int language_count = desc_len / 5;
1652 
1653  if (desc_len > 0 && desc_len % 5 != 0)
1654  return AVERROR_INVALIDDATA;
1655 
1656  if (language_count > 0) {
1657  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1658  av_assert0(language_count <= sizeof(language) / 4);
1659 
1660  if (st->codec->extradata == NULL) {
1661  if (ff_alloc_extradata(st->codec, language_count * 2)) {
1662  return AVERROR(ENOMEM);
1663  }
1664  }
1665 
1666  if (st->codec->extradata_size < language_count * 2)
1667  return AVERROR_INVALIDDATA;
1668 
1669  extradata = st->codec->extradata;
1670 
1671  for (i = 0; i < language_count; i++) {
1672  language[i * 4 + 0] = get8(pp, desc_end);
1673  language[i * 4 + 1] = get8(pp, desc_end);
1674  language[i * 4 + 2] = get8(pp, desc_end);
1675  language[i * 4 + 3] = ',';
1676 
1677  memcpy(extradata, *pp, 2);
1678  extradata += 2;
1679 
1680  *pp += 2;
1681  }
1682 
1683  language[i * 4 - 1] = 0;
1684  av_dict_set(&st->metadata, "language", language, 0);
1685  }
1686  }
1687  break;
1688  case 0x59: /* subtitling descriptor */
1689  {
1690  /* 8 bytes per DVB subtitle substream data:
1691  * ISO_639_language_code (3 bytes),
1692  * subtitling_type (1 byte),
1693  * composition_page_id (2 bytes),
1694  * ancillary_page_id (2 bytes) */
1695  int language_count = desc_len / 8;
1696 
1697  if (desc_len > 0 && desc_len % 8 != 0)
1698  return AVERROR_INVALIDDATA;
1699 
1700  if (language_count > 1) {
1701  avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1702  }
1703 
1704  if (language_count > 0) {
1705  uint8_t *extradata;
1706 
1707  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1708  av_assert0(language_count <= sizeof(language) / 4);
1709 
1710  if (st->codec->extradata == NULL) {
1711  if (ff_alloc_extradata(st->codec, language_count * 5)) {
1712  return AVERROR(ENOMEM);
1713  }
1714  }
1715 
1716  if (st->codec->extradata_size < language_count * 5)
1717  return AVERROR_INVALIDDATA;
1718 
1719  extradata = st->codec->extradata;
1720 
1721  for (i = 0; i < language_count; i++) {
1722  language[i * 4 + 0] = get8(pp, desc_end);
1723  language[i * 4 + 1] = get8(pp, desc_end);
1724  language[i * 4 + 2] = get8(pp, desc_end);
1725  language[i * 4 + 3] = ',';
1726 
1727  /* hearing impaired subtitles detection using subtitling_type */
1728  switch (*pp[0]) {
1729  case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1730  case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1731  case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1732  case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1733  case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1734  case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1736  break;
1737  }
1738 
1739  extradata[4] = get8(pp, desc_end); /* subtitling_type */
1740  memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1741  extradata += 5;
1742 
1743  *pp += 4;
1744  }
1745 
1746  language[i * 4 - 1] = 0;
1747  av_dict_set(&st->metadata, "language", language, 0);
1748  }
1749  }
1750  break;
1751  case 0x0a: /* ISO 639 language descriptor */
1752  for (i = 0; i + 4 <= desc_len; i += 4) {
1753  language[i + 0] = get8(pp, desc_end);
1754  language[i + 1] = get8(pp, desc_end);
1755  language[i + 2] = get8(pp, desc_end);
1756  language[i + 3] = ',';
1757  switch (get8(pp, desc_end)) {
1758  case 0x01:
1760  break;
1761  case 0x02:
1763  break;
1764  case 0x03:
1766  break;
1767  }
1768  }
1769  if (i && language[0]) {
1770  language[i - 1] = 0;
1771  av_dict_set(&st->metadata, "language", language, 0);
1772  }
1773  break;
1774  case 0x05: /* registration descriptor */
1775  st->codec->codec_tag = bytestream_get_le32(pp);
1776  av_log(fc, AV_LOG_TRACE, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1777  if (st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) {
1778  mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1779  if (st->codec->codec_tag == MKTAG('B', 'S', 'S', 'D'))
1780  st->request_probe = 50;
1781  }
1782  break;
1783  case 0x52: /* stream identifier descriptor */
1784  st->stream_identifier = 1 + get8(pp, desc_end);
1785  break;
1786  case 0x26: /* metadata descriptor */
1787  if (get16(pp, desc_end) == 0xFFFF)
1788  *pp += 4;
1789  if (get8(pp, desc_end) == 0xFF) {
1790  st->codec->codec_tag = bytestream_get_le32(pp);
1791  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1792  mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1793  }
1794  break;
1795  case 0x7f: /* DVB extension descriptor */
1796  ext_desc_tag = get8(pp, desc_end);
1797  if (ext_desc_tag < 0)
1798  return AVERROR_INVALIDDATA;
1799  if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1800  ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1801  if (!st->codec->extradata) {
1804  if (!st->codec->extradata)
1805  return AVERROR(ENOMEM);
1806 
1809 
1810  channel_config_code = get8(pp, desc_end);
1811  if (channel_config_code < 0)
1812  return AVERROR_INVALIDDATA;
1813  if (channel_config_code <= 0x8) {
1814  st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1815  st->codec->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
1816  st->codec->extradata[19] = opus_stream_cnt[channel_config_code];
1817  st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1818  memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1819  } else {
1820  avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1821  }
1823  }
1824  }
1825  break;
1826  default:
1827  break;
1828  }
1829  *pp = desc_end;
1830  return 0;
1831 }
1832 
1833 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1834 {
1835  MpegTSContext *ts = filter->u.section_filter.opaque;
1836  MpegTSSectionFilter *tssf = &filter->u.section_filter;
1837  SectionHeader h1, *h = &h1;
1838  PESContext *pes;
1839  AVStream *st;
1840  const uint8_t *p, *p_end, *desc_list_end;
1841  int program_info_length, pcr_pid, pid, stream_type;
1842  int desc_list_len;
1843  uint32_t prog_reg_desc = 0; /* registration descriptor */
1844 
1845  int mp4_descr_count = 0;
1846  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1847  int i;
1848 
1849  av_log(ts->stream, AV_LOG_TRACE, "PMT: len %i\n", section_len);
1850  hex_dump_debug(ts->stream, section, section_len);
1851 
1852  p_end = section + section_len - 4;
1853  p = section;
1854  if (parse_section_header(h, &p, p_end) < 0)
1855  return;
1856  if (skip_identical(h, tssf))
1857  return;
1858 
1859  av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x sec_num=%d/%d version=%d\n",
1860  h->id, h->sec_num, h->last_sec_num, h->version);
1861 
1862  if (h->tid != PMT_TID)
1863  return;
1864  if (!ts->scan_all_pmts && ts->skip_changes)
1865  return;
1866 
1867  if (!ts->skip_clear)
1868  clear_program(ts, h->id);
1869 
1870  pcr_pid = get16(&p, p_end);
1871  if (pcr_pid < 0)
1872  return;
1873  pcr_pid &= 0x1fff;
1874  add_pid_to_pmt(ts, h->id, pcr_pid);
1875  set_pcr_pid(ts->stream, h->id, pcr_pid);
1876 
1877  av_log(ts->stream, AV_LOG_TRACE, "pcr_pid=0x%x\n", pcr_pid);
1878 
1879  program_info_length = get16(&p, p_end);
1880  if (program_info_length < 0)
1881  return;
1882  program_info_length &= 0xfff;
1883  while (program_info_length >= 2) {
1884  uint8_t tag, len;
1885  tag = get8(&p, p_end);
1886  len = get8(&p, p_end);
1887 
1888  av_log(ts->stream, AV_LOG_TRACE, "program tag: 0x%02x len=%d\n", tag, len);
1889 
1890  if (len > program_info_length - 2)
1891  // something else is broken, exit the program_descriptors_loop
1892  break;
1893  program_info_length -= len + 2;
1894  if (tag == 0x1d) { // IOD descriptor
1895  get8(&p, p_end); // scope
1896  get8(&p, p_end); // label
1897  len -= 2;
1898  mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1899  &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1900  } else if (tag == 0x05 && len >= 4) { // registration descriptor
1901  prog_reg_desc = bytestream_get_le32(&p);
1902  len -= 4;
1903  }
1904  p += len;
1905  }
1906  p += program_info_length;
1907  if (p >= p_end)
1908  goto out;
1909 
1910  // stop parsing after pmt, we found header
1911  if (!ts->stream->nb_streams)
1912  ts->stop_parse = 2;
1913 
1914  set_pmt_found(ts, h->id);
1915 
1916 
1917  for (;;) {
1918  st = 0;
1919  pes = NULL;
1920  stream_type = get8(&p, p_end);
1921  if (stream_type < 0)
1922  break;
1923  pid = get16(&p, p_end);
1924  if (pid < 0)
1925  goto out;
1926  pid &= 0x1fff;
1927  if (pid == ts->current_pid)
1928  goto out;
1929 
1930  /* now create stream */
1931  if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1932  pes = ts->pids[pid]->u.pes_filter.opaque;
1933  if (!pes->st) {
1934  pes->st = avformat_new_stream(pes->stream, NULL);
1935  if (!pes->st)
1936  goto out;
1937  pes->st->id = pes->pid;
1938  }
1939  st = pes->st;
1940  } else if (stream_type != 0x13) {
1941  if (ts->pids[pid])
1942  mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1943  pes = add_pes_stream(ts, pid, pcr_pid);
1944  if (pes) {
1945  st = avformat_new_stream(pes->stream, NULL);
1946  if (!st)
1947  goto out;
1948  st->id = pes->pid;
1949  }
1950  } else {
1951  int idx = ff_find_stream_index(ts->stream, pid);
1952  if (idx >= 0) {
1953  st = ts->stream->streams[idx];
1954  } else {
1955  st = avformat_new_stream(ts->stream, NULL);
1956  if (!st)
1957  goto out;
1958  st->id = pid;
1960  }
1961  }
1962 
1963  if (!st)
1964  goto out;
1965 
1966  if (pes && !pes->stream_type)
1967  mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1968 
1969  add_pid_to_pmt(ts, h->id, pid);
1970 
1972 
1973  desc_list_len = get16(&p, p_end);
1974  if (desc_list_len < 0)
1975  goto out;
1976  desc_list_len &= 0xfff;
1977  desc_list_end = p + desc_list_len;
1978  if (desc_list_end > p_end)
1979  goto out;
1980  for (;;) {
1981  if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1982  desc_list_end, mp4_descr,
1983  mp4_descr_count, pid, ts) < 0)
1984  break;
1985 
1986  if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1987  stream_type == 0x83 && pes->sub_st) {
1989  pes->sub_st->index);
1990  pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1991  }
1992  }
1993  p = desc_list_end;
1994  }
1995 
1996  if (!ts->pids[pcr_pid])
1997  mpegts_open_pcr_filter(ts, pcr_pid);
1998 
1999 out:
2000  for (i = 0; i < mp4_descr_count; i++)
2001  av_free(mp4_descr[i].dec_config_descr);
2002 }
2003 
2004 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2005 {
2006  MpegTSContext *ts = filter->u.section_filter.opaque;
2007  MpegTSSectionFilter *tssf = &filter->u.section_filter;
2008  SectionHeader h1, *h = &h1;
2009  const uint8_t *p, *p_end;
2010  int sid, pmt_pid;
2011  AVProgram *program;
2012 
2013  av_log(ts->stream, AV_LOG_TRACE, "PAT:\n");
2014  hex_dump_debug(ts->stream, section, section_len);
2015 
2016  p_end = section + section_len - 4;
2017  p = section;
2018  if (parse_section_header(h, &p, p_end) < 0)
2019  return;
2020  if (h->tid != PAT_TID)
2021  return;
2022  if (ts->skip_changes)
2023  return;
2024 
2025  if (skip_identical(h, tssf))
2026  return;
2027  ts->stream->ts_id = h->id;
2028 
2029  clear_programs(ts);
2030  for (;;) {
2031  sid = get16(&p, p_end);
2032  if (sid < 0)
2033  break;
2034  pmt_pid = get16(&p, p_end);
2035  if (pmt_pid < 0)
2036  break;
2037  pmt_pid &= 0x1fff;
2038 
2039  if (pmt_pid == ts->current_pid)
2040  break;
2041 
2042  av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
2043 
2044  if (sid == 0x0000) {
2045  /* NIT info */
2046  } else {
2047  MpegTSFilter *fil = ts->pids[pmt_pid];
2048  program = av_new_program(ts->stream, sid);
2049  if (program) {
2050  program->program_num = sid;
2051  program->pmt_pid = pmt_pid;
2052  }
2053  if (fil)
2054  if ( fil->type != MPEGTS_SECTION
2055  || fil->pid != pmt_pid
2056  || fil->u.section_filter.section_cb != pmt_cb)
2057  mpegts_close_filter(ts, ts->pids[pmt_pid]);
2058 
2059  if (!ts->pids[pmt_pid])
2060  mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2061  add_pat_entry(ts, sid);
2062  add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2063  add_pid_to_pmt(ts, sid, pmt_pid);
2064  }
2065  }
2066 
2067  if (sid < 0) {
2068  int i,j;
2069  for (j=0; j<ts->stream->nb_programs; j++) {
2070  for (i = 0; i < ts->nb_prg; i++)
2071  if (ts->prg[i].id == ts->stream->programs[j]->id)
2072  break;
2073  if (i==ts->nb_prg && !ts->skip_clear)
2074  clear_avprogram(ts, ts->stream->programs[j]->id);
2075  }
2076  }
2077 }
2078 
2079 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2080 {
2081  MpegTSContext *ts = filter->u.section_filter.opaque;
2082  MpegTSSectionFilter *tssf = &filter->u.section_filter;
2083  SectionHeader h1, *h = &h1;
2084  const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2085  int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2086  char *name, *provider_name;
2087 
2088  av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
2089  hex_dump_debug(ts->stream, section, section_len);
2090 
2091  p_end = section + section_len - 4;
2092  p = section;
2093  if (parse_section_header(h, &p, p_end) < 0)
2094  return;
2095  if (h->tid != SDT_TID)
2096  return;
2097  if (ts->skip_changes)
2098  return;
2099  if (skip_identical(h, tssf))
2100  return;
2101 
2102  onid = get16(&p, p_end);
2103  if (onid < 0)
2104  return;
2105  val = get8(&p, p_end);
2106  if (val < 0)
2107  return;
2108  for (;;) {
2109  sid = get16(&p, p_end);
2110  if (sid < 0)
2111  break;
2112  val = get8(&p, p_end);
2113  if (val < 0)
2114  break;
2115  desc_list_len = get16(&p, p_end);
2116  if (desc_list_len < 0)
2117  break;
2118  desc_list_len &= 0xfff;
2119  desc_list_end = p + desc_list_len;
2120  if (desc_list_end > p_end)
2121  break;
2122  for (;;) {
2123  desc_tag = get8(&p, desc_list_end);
2124  if (desc_tag < 0)
2125  break;
2126  desc_len = get8(&p, desc_list_end);
2127  desc_end = p + desc_len;
2128  if (desc_len < 0 || desc_end > desc_list_end)
2129  break;
2130 
2131  av_log(ts->stream, AV_LOG_TRACE, "tag: 0x%02x len=%d\n",
2132  desc_tag, desc_len);
2133 
2134  switch (desc_tag) {
2135  case 0x48:
2136  service_type = get8(&p, p_end);
2137  if (service_type < 0)
2138  break;
2139  provider_name = getstr8(&p, p_end);
2140  if (!provider_name)
2141  break;
2142  name = getstr8(&p, p_end);
2143  if (name) {
2144  AVProgram *program = av_new_program(ts->stream, sid);
2145  if (program) {
2146  av_dict_set(&program->metadata, "service_name", name, 0);
2147  av_dict_set(&program->metadata, "service_provider",
2148  provider_name, 0);
2149  }
2150  }
2151  av_free(name);
2152  av_free(provider_name);
2153  break;
2154  default:
2155  break;
2156  }
2157  p = desc_end;
2158  }
2159  p = desc_list_end;
2160  }
2161 }
2162 
2163 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2164  const uint8_t *packet);
2165 
2166 /* handle one TS packet */
2167 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2168 {
2169  MpegTSFilter *tss;
2170  int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2171  has_adaptation, has_payload;
2172  const uint8_t *p, *p_end;
2173  int64_t pos;
2174 
2175  pid = AV_RB16(packet + 1) & 0x1fff;
2176  if (pid && discard_pid(ts, pid))
2177  return 0;
2178  is_start = packet[1] & 0x40;
2179  tss = ts->pids[pid];
2180  if (ts->auto_guess && !tss && is_start) {
2181  add_pes_stream(ts, pid, -1);
2182  tss = ts->pids[pid];
2183  }
2184  if (!tss)
2185  return 0;
2186  ts->current_pid = pid;
2187 
2188  afc = (packet[3] >> 4) & 3;
2189  if (afc == 0) /* reserved value */
2190  return 0;
2191  has_adaptation = afc & 2;
2192  has_payload = afc & 1;
2193  is_discontinuity = has_adaptation &&
2194  packet[4] != 0 && /* with length > 0 */
2195  (packet[5] & 0x80); /* and discontinuity indicated */
2196 
2197  /* continuity check (currently not used) */
2198  cc = (packet[3] & 0xf);
2199  expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2200  cc_ok = pid == 0x1FFF || // null packet PID
2201  is_discontinuity ||
2202  tss->last_cc < 0 ||
2203  expected_cc == cc;
2204 
2205  tss->last_cc = cc;
2206  if (!cc_ok) {
2207  av_log(ts->stream, AV_LOG_DEBUG,
2208  "Continuity check failed for pid %d expected %d got %d\n",
2209  pid, expected_cc, cc);
2210  if (tss->type == MPEGTS_PES) {
2211  PESContext *pc = tss->u.pes_filter.opaque;
2212  pc->flags |= AV_PKT_FLAG_CORRUPT;
2213  }
2214  }
2215 
2216  p = packet + 4;
2217  if (has_adaptation) {
2218  int64_t pcr_h;
2219  int pcr_l;
2220  if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2221  tss->last_pcr = pcr_h * 300 + pcr_l;
2222  /* skip adaptation field */
2223  p += p[0] + 1;
2224  }
2225  /* if past the end of packet, ignore */
2226  p_end = packet + TS_PACKET_SIZE;
2227  if (p >= p_end || !has_payload)
2228  return 0;
2229 
2230  pos = avio_tell(ts->stream->pb);
2231  if (pos >= 0) {
2232  av_assert0(pos >= TS_PACKET_SIZE);
2233  ts->pos47_full = pos - TS_PACKET_SIZE;
2234  }
2235 
2236  if (tss->type == MPEGTS_SECTION) {
2237  if (is_start) {
2238  /* pointer field present */
2239  len = *p++;
2240  if (len > p_end - p)
2241  return 0;
2242  if (len && cc_ok) {
2243  /* write remaining section bytes */
2244  write_section_data(ts, tss,
2245  p, len, 0);
2246  /* check whether filter has been closed */
2247  if (!ts->pids[pid])
2248  return 0;
2249  }
2250  p += len;
2251  if (p < p_end) {
2252  write_section_data(ts, tss,
2253  p, p_end - p, 1);
2254  }
2255  } else {
2256  if (cc_ok) {
2257  write_section_data(ts, tss,
2258  p, p_end - p, 0);
2259  }
2260  }
2261 
2262  // stop find_stream_info from waiting for more streams
2263  // when all programs have received a PMT
2264  if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2265  int i;
2266  for (i = 0; i < ts->nb_prg; i++) {
2267  if (!ts->prg[i].pmt_found)
2268  break;
2269  }
2270  if (i == ts->nb_prg && ts->nb_prg > 0) {
2271  int types = 0;
2272  for (i = 0; i < ts->stream->nb_streams; i++) {
2273  AVStream *st = ts->stream->streams[i];
2274  types |= 1<<st->codec->codec_type;
2275  }
2276  if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2277  av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2279  }
2280  }
2281  }
2282 
2283  } else {
2284  int ret;
2285  // Note: The position here points actually behind the current packet.
2286  if (tss->type == MPEGTS_PES) {
2287  if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2288  pos - ts->raw_packet_size)) < 0)
2289  return ret;
2290  }
2291  }
2292 
2293  return 0;
2294 }
2295 
2296 static void reanalyze(MpegTSContext *ts) {
2297  AVIOContext *pb = ts->stream->pb;
2298  int64_t pos = avio_tell(pb);
2299  if (pos < 0)
2300  return;
2301  pos -= ts->pos47_full;
2302  if (pos == TS_PACKET_SIZE) {
2303  ts->size_stat[0] ++;
2304  } else if (pos == TS_DVHS_PACKET_SIZE) {
2305  ts->size_stat[1] ++;
2306  } else if (pos == TS_FEC_PACKET_SIZE) {
2307  ts->size_stat[2] ++;
2308  }
2309 
2310  ts->size_stat_count ++;
2312  int newsize = 0;
2313  if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2314  newsize = TS_PACKET_SIZE;
2315  } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2316  newsize = TS_DVHS_PACKET_SIZE;
2317  } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2318  newsize = TS_FEC_PACKET_SIZE;
2319  }
2320  if (newsize && newsize != ts->raw_packet_size) {
2321  av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2322  ts->raw_packet_size = newsize;
2323  }
2324  ts->size_stat_count = 0;
2325  memset(ts->size_stat, 0, sizeof(ts->size_stat));
2326  }
2327 }
2328 
2329 /* XXX: try to find a better synchro over several packets (use
2330  * get_packet_size() ?) */
2332 {
2333  MpegTSContext *ts = s->priv_data;
2334  AVIOContext *pb = s->pb;
2335  int c, i;
2336 
2337  for (i = 0; i < ts->resync_size; i++) {
2338  c = avio_r8(pb);
2339  if (avio_feof(pb))
2340  return AVERROR_EOF;
2341  if (c == 0x47) {
2342  avio_seek(pb, -1, SEEK_CUR);
2343  reanalyze(s->priv_data);
2344  return 0;
2345  }
2346  }
2347  av_log(s, AV_LOG_ERROR,
2348  "max resync size reached, could not find sync byte\n");
2349  /* no sync found */
2350  return AVERROR_INVALIDDATA;
2351 }
2352 
2353 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2354 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2355  const uint8_t **data)
2356 {
2357  AVIOContext *pb = s->pb;
2358  int len;
2359 
2360  for (;;) {
2361  len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2362  if (len != TS_PACKET_SIZE)
2363  return len < 0 ? len : AVERROR_EOF;
2364  /* check packet sync byte */
2365  if ((*data)[0] != 0x47) {
2366  /* find a new packet start */
2367  uint64_t pos = avio_tell(pb);
2368  avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2369 
2370  if (mpegts_resync(s) < 0)
2371  return AVERROR(EAGAIN);
2372  else
2373  continue;
2374  } else {
2375  break;
2376  }
2377  }
2378  return 0;
2379 }
2380 
2381 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2382 {
2383  AVIOContext *pb = s->pb;
2384  int skip = raw_packet_size - TS_PACKET_SIZE;
2385  if (skip > 0)
2386  avio_skip(pb, skip);
2387 }
2388 
2389 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2390 {
2391  AVFormatContext *s = ts->stream;
2393  const uint8_t *data;
2394  int64_t packet_num;
2395  int ret = 0;
2396 
2397  if (avio_tell(s->pb) != ts->last_pos) {
2398  int i;
2399  av_log(ts->stream, AV_LOG_TRACE, "Skipping after seek\n");
2400  /* seek detected, flush pes buffer */
2401  for (i = 0; i < NB_PID_MAX; i++) {
2402  if (ts->pids[i]) {
2403  if (ts->pids[i]->type == MPEGTS_PES) {
2404  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2405  av_buffer_unref(&pes->buffer);
2406  pes->data_index = 0;
2407  pes->state = MPEGTS_SKIP; /* skip until pes header */
2408  } else if (ts->pids[i]->type == MPEGTS_SECTION) {
2409  ts->pids[i]->u.section_filter.last_ver = -1;
2410  }
2411  ts->pids[i]->last_cc = -1;
2412  ts->pids[i]->last_pcr = -1;
2413  }
2414  }
2415  }
2416 
2417  ts->stop_parse = 0;
2418  packet_num = 0;
2419  memset(packet + TS_PACKET_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
2420  for (;;) {
2421  packet_num++;
2422  if (nb_packets != 0 && packet_num >= nb_packets ||
2423  ts->stop_parse > 1) {
2424  ret = AVERROR(EAGAIN);
2425  break;
2426  }
2427  if (ts->stop_parse > 0)
2428  break;
2429 
2430  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2431  if (ret != 0)
2432  break;
2433  ret = handle_packet(ts, data);
2435  if (ret != 0)
2436  break;
2437  }
2438  ts->last_pos = avio_tell(s->pb);
2439  return ret;
2440 }
2441 
2443 {
2444  const int size = p->buf_size;
2445  int maxscore = 0;
2446  int sumscore = 0;
2447  int i;
2448  int check_count = size / TS_FEC_PACKET_SIZE;
2449 #define CHECK_COUNT 10
2450 #define CHECK_BLOCK 100
2451 
2452  if (check_count < CHECK_COUNT)
2453  return 0;
2454 
2455  for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2456  int left = FFMIN(check_count - i, CHECK_BLOCK);
2457  int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL, 1);
2458  int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL, 1);
2459  int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL, 1);
2460  score = FFMAX3(score, dvhs_score, fec_score);
2461  sumscore += score;
2462  maxscore = FFMAX(maxscore, score);
2463  }
2464 
2465  sumscore = sumscore * CHECK_COUNT / check_count;
2466  maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2467 
2468  ff_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2469 
2470  if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2471  else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2472  else
2473  return 0;
2474 }
2475 
2476 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2477  * (-1) if not available */
2478 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2479 {
2480  int afc, len, flags;
2481  const uint8_t *p;
2482  unsigned int v;
2483 
2484  afc = (packet[3] >> 4) & 3;
2485  if (afc <= 1)
2486  return AVERROR_INVALIDDATA;
2487  p = packet + 4;
2488  len = p[0];
2489  p++;
2490  if (len == 0)
2491  return AVERROR_INVALIDDATA;
2492  flags = *p++;
2493  len--;
2494  if (!(flags & 0x10))
2495  return AVERROR_INVALIDDATA;
2496  if (len < 6)
2497  return AVERROR_INVALIDDATA;
2498  v = AV_RB32(p);
2499  *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2500  *ppcr_low = ((p[4] & 1) << 8) | p[5];
2501  return 0;
2502 }
2503 
2504 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2505 
2506  /* NOTE: We attempt to seek on non-seekable files as well, as the
2507  * probe buffer usually is big enough. Only warn if the seek failed
2508  * on files where the seek should work. */
2509  if (avio_seek(pb, pos, SEEK_SET) < 0)
2510  av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2511 }
2512 
2514 {
2515  MpegTSContext *ts = s->priv_data;
2516  AVIOContext *pb = s->pb;
2517  uint8_t buf[8 * 1024] = {0};
2518  int len;
2519  int64_t pos, probesize =
2520 #if FF_API_PROBESIZE_32
2521  s->probesize ? s->probesize : s->probesize2;
2522 #else
2523  s->probesize;
2524 #endif
2525 
2526  if (ffio_ensure_seekback(pb, probesize) < 0)
2527  av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
2528 
2529  /* read the first 8192 bytes to get packet size */
2530  pos = avio_tell(pb);
2531  len = avio_read(pb, buf, sizeof(buf));
2532  ts->raw_packet_size = get_packet_size(buf, len);
2533  if (ts->raw_packet_size <= 0) {
2534  av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2536  }
2537  ts->stream = s;
2538  ts->auto_guess = 0;
2539 
2540  if (s->iformat == &ff_mpegts_demuxer) {
2541  /* normal demux */
2542 
2543  /* first do a scan to get all the services */
2544  seek_back(s, pb, pos);
2545 
2547 
2549 
2550  handle_packets(ts, probesize / ts->raw_packet_size);
2551  /* if could not find service, enable auto_guess */
2552 
2553  ts->auto_guess = 1;
2554 
2555  av_log(ts->stream, AV_LOG_TRACE, "tuning done\n");
2556 
2558  } else {
2559  AVStream *st;
2560  int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2561  int64_t pcrs[2], pcr_h;
2562  int packet_count[2];
2563  uint8_t packet[TS_PACKET_SIZE];
2564  const uint8_t *data;
2565 
2566  /* only read packets */
2567 
2568  st = avformat_new_stream(s, NULL);
2569  if (!st)
2570  return AVERROR(ENOMEM);
2571  avpriv_set_pts_info(st, 60, 1, 27000000);
2574 
2575  /* we iterate until we find two PCRs to estimate the bitrate */
2576  pcr_pid = -1;
2577  nb_pcrs = 0;
2578  nb_packets = 0;
2579  for (;;) {
2580  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2581  if (ret < 0)
2582  return ret;
2583  pid = AV_RB16(data + 1) & 0x1fff;
2584  if ((pcr_pid == -1 || pcr_pid == pid) &&
2585  parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2587  pcr_pid = pid;
2588  packet_count[nb_pcrs] = nb_packets;
2589  pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2590  nb_pcrs++;
2591  if (nb_pcrs >= 2) {
2592  if (pcrs[1] - pcrs[0] > 0) {
2593  /* the difference needs to be positive to make sense for bitrate computation */
2594  break;
2595  } else {
2596  av_log(ts->stream, AV_LOG_WARNING, "invalid pcr pair %"PRId64" >= %"PRId64"\n", pcrs[0], pcrs[1]);
2597  pcrs[0] = pcrs[1];
2598  packet_count[0] = packet_count[1];
2599  nb_pcrs--;
2600  }
2601  }
2602  } else {
2604  }
2605  nb_packets++;
2606  }
2607 
2608  /* NOTE1: the bitrate is computed without the FEC */
2609  /* NOTE2: it is only the bitrate of the start of the stream */
2610  ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2611  ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2612  s->bit_rate = TS_PACKET_SIZE * 8 * 27000000LL / ts->pcr_incr;
2613  st->codec->bit_rate = s->bit_rate;
2614  st->start_time = ts->cur_pcr;
2615  av_log(ts->stream, AV_LOG_TRACE, "start=%0.3f pcr=%0.3f incr=%d\n",
2616  st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2617  }
2618 
2619  seek_back(s, pb, pos);
2620  return 0;
2621 }
2622 
2623 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2624 
2626 {
2627  MpegTSContext *ts = s->priv_data;
2628  int ret, i;
2629  int64_t pcr_h, next_pcr_h, pos;
2630  int pcr_l, next_pcr_l;
2631  uint8_t pcr_buf[12];
2632  const uint8_t *data;
2633 
2634  if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2635  return AVERROR(ENOMEM);
2636  ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2637  pkt->pos = avio_tell(s->pb);
2638  if (ret < 0) {
2639  av_free_packet(pkt);
2640  return ret;
2641  }
2642  if (data != pkt->data)
2643  memcpy(pkt->data, data, ts->raw_packet_size);
2645  if (ts->mpeg2ts_compute_pcr) {
2646  /* compute exact PCR for each packet */
2647  if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2648  /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2649  pos = avio_tell(s->pb);
2650  for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2651  avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2652  avio_read(s->pb, pcr_buf, 12);
2653  if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2654  /* XXX: not precise enough */
2655  ts->pcr_incr =
2656  ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2657  (i + 1);
2658  break;
2659  }
2660  }
2661  avio_seek(s->pb, pos, SEEK_SET);
2662  /* no next PCR found: we use previous increment */
2663  ts->cur_pcr = pcr_h * 300 + pcr_l;
2664  }
2665  pkt->pts = ts->cur_pcr;
2666  pkt->duration = ts->pcr_incr;
2667  ts->cur_pcr += ts->pcr_incr;
2668  }
2669  pkt->stream_index = 0;
2670  return 0;
2671 }
2672 
2674 {
2675  MpegTSContext *ts = s->priv_data;
2676  int ret, i;
2677 
2678  pkt->size = -1;
2679  ts->pkt = pkt;
2680  ret = handle_packets(ts, 0);
2681  if (ret < 0) {
2682  av_free_packet(ts->pkt);
2683  /* flush pes data left */
2684  for (i = 0; i < NB_PID_MAX; i++)
2685  if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2686  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2687  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2688  new_pes_packet(pes, pkt);
2689  pes->state = MPEGTS_SKIP;
2690  ret = 0;
2691  break;
2692  }
2693  }
2694  }
2695 
2696  if (!ret && pkt->size < 0)
2697  ret = AVERROR(EINTR);
2698  return ret;
2699 }
2700 
2701 static void mpegts_free(MpegTSContext *ts)
2702 {
2703  int i;
2704 
2705  clear_programs(ts);
2706 
2707  for (i = 0; i < NB_PID_MAX; i++)
2708  if (ts->pids[i])
2709  mpegts_close_filter(ts, ts->pids[i]);
2710 }
2711 
2713 {
2714  MpegTSContext *ts = s->priv_data;
2715  mpegts_free(ts);
2716  return 0;
2717 }
2718 
2719 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2720  int64_t *ppos, int64_t pos_limit)
2721 {
2722  MpegTSContext *ts = s->priv_data;
2723  int64_t pos, timestamp;
2725  int pcr_l, pcr_pid =
2726  ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2727  int pos47 = ts->pos47_full % ts->raw_packet_size;
2728  pos =
2729  ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2730  ts->raw_packet_size + pos47;
2731  while(pos < pos_limit) {
2732  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2733  return AV_NOPTS_VALUE;
2734  if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2735  return AV_NOPTS_VALUE;
2736  if (buf[0] != 0x47) {
2737  avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2738  if (mpegts_resync(s) < 0)
2739  return AV_NOPTS_VALUE;
2740  pos = avio_tell(s->pb);
2741  continue;
2742  }
2743  if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2744  parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2745  *ppos = pos;
2746  return timestamp;
2747  }
2748  pos += ts->raw_packet_size;
2749  }
2750 
2751  return AV_NOPTS_VALUE;
2752 }
2753 
2754 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2755  int64_t *ppos, int64_t pos_limit)
2756 {
2757  MpegTSContext *ts = s->priv_data;
2758  int64_t pos;
2759  int pos47 = ts->pos47_full % ts->raw_packet_size;
2760  pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2762  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2763  return AV_NOPTS_VALUE;
2764  while(pos < pos_limit) {
2765  int ret;
2766  AVPacket pkt;
2767  av_init_packet(&pkt);
2768  ret = av_read_frame(s, &pkt);
2769  if (ret < 0)
2770  return AV_NOPTS_VALUE;
2771  av_free_packet(&pkt);
2772  if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2773  ff_reduce_index(s, pkt.stream_index);
2774  av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2775  if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2776  *ppos = pkt.pos;
2777  return pkt.dts;
2778  }
2779  }
2780  pos = pkt.pos;
2781  }
2782 
2783  return AV_NOPTS_VALUE;
2784 }
2785 
2786 /**************************************************************/
2787 /* parsing functions - called from other demuxers such as RTP */
2788 
2790 {
2791  MpegTSContext *ts;
2792 
2793  ts = av_mallocz(sizeof(MpegTSContext));
2794  if (!ts)
2795  return NULL;
2796  /* no stream case, currently used by RTP */
2798  ts->stream = s;
2799  ts->auto_guess = 1;
2802 
2803  return ts;
2804 }
2805 
2806 /* return the consumed length if a packet was output, or -1 if no
2807  * packet is output */
2809  const uint8_t *buf, int len)
2810 {
2811  int len1;
2812 
2813  len1 = len;
2814  ts->pkt = pkt;
2815  for (;;) {
2816  ts->stop_parse = 0;
2817  if (len < TS_PACKET_SIZE)
2818  return AVERROR_INVALIDDATA;
2819  if (buf[0] != 0x47) {
2820  buf++;
2821  len--;
2822  } else {
2823  handle_packet(ts, buf);
2824  buf += TS_PACKET_SIZE;
2825  len -= TS_PACKET_SIZE;
2826  if (ts->stop_parse == 1)
2827  break;
2828  }
2829  }
2830  return len1 - len;
2831 }
2832 
2834 {
2835  mpegts_free(ts);
2836  av_free(ts);
2837 }
2838 
2839 AVInputFormat ff_mpegts_demuxer = {
2840  .name = "mpegts",
2841  .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2842  .priv_data_size = sizeof(MpegTSContext),
2847  .read_timestamp = mpegts_get_dts,
2849  .priv_class = &mpegts_class,
2850 };
2851 
2853  .name = "mpegtsraw",
2854  .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2855  .priv_data_size = sizeof(MpegTSContext),
2859  .read_timestamp = mpegts_get_dts,
2861  .priv_class = &mpegtsraw_class,
2862 };
static void mpegts_free(MpegTSContext *ts)
Definition: mpegts.c:2701
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:1799
uint8_t last_sec_num
Definition: mpegts.c:589
#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
float v
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:222
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:284
int total_size
Definition: mpegts.c:235
static int mpegts_resync(AVFormatContext *s)
Definition: mpegts.c:2331
void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id)
Definition: isom.c:426
static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
Definition: mpegts.c:2381
AVOption.
Definition: opt.h:255
A dummy id pointing at the start of audio codecs.
Definition: avcodec.h:330
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:296
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:1748
#define MAX_PACKET_READAHEAD
Definition: mpegts.c:2623
enum AVMediaType codec_type
Definition: mpegts.c:684
int64_t dts
Definition: mpegts.c:238
static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1326
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
#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:2167
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1458
static void clear_program(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:273
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:4093
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:218
static int mpegts_probe(AVProbeData *p)
Definition: mpegts.c:2442
#define MP4ODescrTag
Definition: isom.h:220
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:1038
MpegTSContext * avpriv_mpegts_parse_open(AVFormatContext *s)
Definition: mpegts.c:2789
int64_t pts_wrap_reference
Internal data to check for wrapping of the time stamp.
Definition: avformat.h:1143
int index
stream index in AVFormatContext
Definition: avformat.h:855
int size
Definition: avcodec.h:1434
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:204
uint8_t version
Definition: mpegts.c:587
int size_stat_count
Definition: mpegts.c:119
#define AV_DISPOSITION_HEARING_IMPAIRED
stream for hearing impaired audiences
Definition: avformat.h:822
AVInputFormat ff_mpegts_demuxer
Definition: mpegts.c:2839
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
Definition: mpegts.c:2079
A dummy ID pointing at the start of various fake codecs.
Definition: avcodec.h:536
void * priv_data
Definition: avformat.h:874
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:279
#define AV_DISPOSITION_CLEAN_EFFECTS
stream without voice
Definition: avformat.h:824
#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:653
discard all
Definition: avcodec.h:689
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:2673
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:679
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1334
int pcr_pid
if -1 then all packets containing PCR are considered
Definition: mpegts.c:225
SLConfigDescr sl
Definition: mpegts.h:92
int packet_seq_num_len
Definition: mpegts.h:85
int es_id
Definition: mpegts.h:89
int inst_bitrate_len
Definition: mpegts.h:82
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:479
int last_cc
Definition: mpegts.c:92
Format I/O context.
Definition: avformat.h:1285
static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size, const uint8_t **data)
Definition: mpegts.c:2354
unsigned int nb_stream_indexes
Definition: avformat.h:1223
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:1627
#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:1676
#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:901
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:2513
AVFormatContext * s
Definition: mpegts.c:1261
uint8_t bits
Definition: crc.c:295
uint8_t
int stream_identifier
Stream Identifier This is the MPEG-TS stream identifier +1 0 means unknown.
Definition: avformat.h:1080
#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:247
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:2754
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1244
AVOptions.
int size_stat[3]
Definition: mpegts.c:118
int au_seq_num_len
Definition: mpegts.h:84
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:694
int stop_parse
stop parsing loop
Definition: mpegts.c:138
static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1340
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:351
#define AV_RB32
Definition: intreadwrite.h:130
static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:291
static int mpegts_push_data(MpegTSFilter *filter, const uint8_t *buf, int buf_size, int is_start, int64_t pos)
Definition: mpegts.c:973
int id
Format-specific stream ID.
Definition: avformat.h:861
enum AVStreamParseType need_parsing
Definition: avformat.h:1046
int use_au_start
Definition: mpegts.h:72
static const AVOption raw_options[]
Definition: mpegts.c:189
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1627
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3756
int pmt_pid
Definition: avformat.h:1227
static const uint8_t opus_channel_map[8][8]
Definition: mpegts.c:1569
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1353
#define TS_PACKET_SIZE
Definition: mpegts.h:29
Mp4Descr * descr
Definition: mpegts.c:1263
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:598
static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
Definition: mpegts.c:1293
uint8_t * data
Definition: avcodec.h:1433
AVProgram * av_new_program(AVFormatContext *s, int id)
Definition: utils.c:3827
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:213
MpegTSState
Definition: mpegts.c:210
uint32_t tag
Definition: movenc.c:1339
#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:390
static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos)
Definition: mpegts.c:2504
enum AVDiscard discard
selects which program to discard and which to feed to the caller
Definition: avformat.h:1221
static int probe(AVProbeData *p)
Definition: act.c:36
static PESContext * add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
Definition: mpegts.c:1235
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1451
unsigned int * stream_index
Definition: avformat.h:1222
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:542
static MpegTSFilter * mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid, PESCallback *pes_cb, void *opaque)
Definition: mpegts.c:491
AVInputFormat ff_mpegtsraw_demuxer
Definition: mpegts.c:2852
static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf, unsigned size, Mp4Descr *descr, int max_descr_count)
Definition: mpegts.c:1271
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:84
#define AVINDEX_KEYFRAME
Definition: avformat.h:803
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:594
static uint64_t get_bits64(GetBitContext *s, int n)
Read 0-64 bits.
Definition: get_bits.h:358
enum AVCodecID codec_id
Definition: mpegts.c:685
#define AVPROBE_SCORE_STREAM_RETRY
Definition: avformat.h:468
AVBufferRef * buffer
Definition: mpegts.c:241
AVProgram * av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s)
Find the programs which belong to a given stream.
Definition: utils.c:3564
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:451
static void reanalyze(MpegTSContext *ts)
Definition: mpegts.c:2296
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:102
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int predefined_SLConfigDescriptor_seen
Definition: mpegts.c:1268
static const StreamType HDMV_types[]
Definition: mpegts.c:710
#define AVFMT_TS_DISCONT
Format allows timestamp discontinuities.
Definition: avformat.h:486
static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:258
av_default_item_name
#define AV_RB16
Definition: intreadwrite.h:53
#define AVERROR(e)
Definition: error.h:43
static int mpegts_read_close(AVFormatContext *s)
Definition: mpegts.c:2712
unsigned int check_crc
Definition: mpegts.c:83
static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpegts.c:2625
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:178
int avcodec_is_open(AVCodecContext *s)
Definition: utils.c:3870
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:1436
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:425
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1416
int pes_header_size
Definition: mpegts.c:236
void ff_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx)
simple assert() macros that are a bit more flexible than ISO C assert().
#define TS_FEC_PACKET_SIZE
Definition: mpegts.h:27
New fields can be added to the end with minor version bumps.
Definition: avformat.h:1218
#define FFMAX(a, b)
Definition: common.h:90
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:79
static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1358
int flags
copied to the AVPacket flags
Definition: mpegts.c:234
int program_num
Definition: avformat.h:1226
#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:1439
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:533
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:873
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:463
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:462
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1341
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:4172
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:160
int bit_rate
the average bitrate
Definition: avcodec.h:1577
int64_t ts_packet_pos
position of first TS packet of this PES packet
Definition: mpegts.c:239
SectionCallback * section_cb
Definition: mpegts.c:85
static const StreamType REGD_types[]
Definition: mpegts.c:732
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:92
static const StreamType MISC_types[]
Definition: mpegts.c:726
uint16_t id
Definition: mpegts.c:586
static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
Definition: mpegts.c:332
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:1476
#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:221
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:356
static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:323
int ocr_len
Definition: mpegts.h:80
static int mpegts_set_stream_info(AVStream *st, PESContext *pes, uint32_t stream_type, uint32_t prog_reg_desc)
Definition: mpegts.c:780
#define AV_RL32
Definition: intreadwrite.h:146
AVDictionary * metadata
Definition: avformat.h:928
static const uint8_t opus_stream_cnt[9]
Definition: mpegts.c:1565
static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len, int target_tag)
Definition: mpegts.c:1411
#define CHECK_COUNT
static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1372
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:1561
#define CHECK_BLOCK
static uint64_t get_ts64(GetBitContext *gb, int bits)
Definition: mpegts.c:894
uint8_t sec_num
Definition: mpegts.c:588
int extended_stream_id
Definition: mpegts.c:237
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:107
union MpegTSFilter::@172 u
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:688
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:634
int ts_id
Transport stream id.
Definition: avformat.h:1597
#define AV_DISPOSITION_VISUAL_IMPAIRED
stream for visual impaired audiences
Definition: avformat.h:823
Stream structure.
Definition: avformat.h:854
#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:552
static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
Definition: mpegts.c:2719
#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:91
enum AVMediaType codec_type
Definition: avcodec.h:1520
unsigned int id
Definition: mpegts.c:103
#define MP4DecConfigDescrTag
Definition: isom.h:223
enum AVCodecID codec_id
Definition: avcodec.h:1529
static MpegTSFilter * mpegts_open_filter(MpegTSContext *ts, unsigned int pid, enum MpegTSFilterType type)
Definition: mpegts.c:443
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:39
AVIOContext * pb
I/O context.
Definition: avformat.h:1327
static const StreamType METADATA_types[]
Definition: mpegts.c:746
int use_au_end
Definition: mpegts.h:73
static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1303
int resync_size
Definition: mpegts.c:149
uint8_t * data
The data buffer.
Definition: buffer.h:89
static void new_pes_packet(PESContext *pes, AVPacket *pkt)
Definition: mpegts.c:863
static int get_packet_size(const uint8_t *buf, int size)
Definition: mpegts.c:561
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1544
int ff_alloc_extradata(AVCodecContext *avctx, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:2938
#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:603
GLint GLenum type
Definition: opengl_enc.c:105
int extradata_size
Definition: avcodec.h:1628
#define MAX_LEVEL
Definition: mpegts.c:1259
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:305
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
Definition: mpegts.c:2478
int use_timestamps
Definition: mpegts.h:76
Describe the class of an AVClass context structure.
Definition: log.h:67
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:298
int index
Definition: gxfenc.c:89
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
Definition: mpegts.c:1833
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:286
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:415
static int analyze(const uint8_t *buf, int size, int packet_size, int *index, int probe)
Definition: mpegts.c:533
int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt, const uint8_t *buf, int len)
Definition: mpegts.c:2808
AVMediaType
Definition: avutil.h:191
refcounted data buffer API
static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
Definition: mpegts.c:512
static const StreamType DESC_types[]
Definition: mpegts.c:753
This structure contains the data a format has to probe a file.
Definition: avformat.h:460
int use_idle
Definition: mpegts.h:77
SLConfigDescr sl
Definition: mpegts.c:242
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1480
int dec_config_descr_len
Definition: mpegts.h:90
uint8_t * section_buf
Definition: mpegts.c:82
uint8_t tid
Definition: mpegts.c:585
AVDictionary * metadata
Definition: avformat.h:1224
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:389
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:1580
static void clear_programs(MpegTSContext *ts)
Definition: mpegts.c:285
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
Definition: aviobuf.c:814
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:342
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:472
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:786
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:2004
int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag)
Definition: isom.c:417
static void filter(MpegAudioContext *s, int ch, const short *samples, int incr)
static const AVClass mpegts_class
Definition: mpegts.c:182
int use_rand_acc_pt
Definition: mpegts.h:74
int data_index
Definition: mpegts.c:233
if(ret< 0)
Definition: vf_mcdeint.c:280
int pts_wrap_behavior
Options for behavior, when a wrap is detected.
Definition: avformat.h:1155
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:72
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:906
static double c[64]
unsigned crc
Definition: mpegts.c:80
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:917
uint8_t header[MAX_PES_HEADER_SIZE]
Definition: mpegts.c:240
static void reset_pes_packet_state(PESContext *pes)
Definition: mpegts.c:854
#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:49
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:1480
struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1297
PESCallback * pes_cb
Definition: mpegts.c:68
static int skip_identical(const SectionHeader *h, MpegTSSectionFilter *tssf)
Definition: mpegts.c:592
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:636
static MpegTSFilter * mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid, SectionCallback *section_cb, void *opaque, int check_crc)
Definition: mpegts.c:466
FAKE codec to indicate a raw MPEG-2 TS stream (only used by libavformat)
Definition: avcodec.h:550
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:616
#define av_free(p)
Mp4Descr * active_descr
Definition: mpegts.c:1264
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:1313
int pcr_pid
Definition: avformat.h:1228
int64_t last_pos
to detect seek
Definition: mpegts.c:142
int timestamp_res
Definition: mpegts.h:78
#define AV_OPT_FLAG_READONLY
The option may not be set through the AVOptions API, only read.
Definition: opt.h:301
#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:305
int64_t pts
Definition: mpegts.c:238
int use_padding
Definition: mpegts.h:75
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> out
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:1432
int bit_rate
Total stream bitrate in bit/s, 0 if not available.
Definition: avformat.h:1387
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:640
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:303
static MpegTSFilter * mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
Definition: mpegts.c:507
int degr_prior_len
Definition: mpegts.h:83
static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1314
static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
Definition: mpegts.c:1492
AVIOContext pb
Definition: mpegts.c:1262
int stream_index
Definition: avcodec.h:1435
MpegTSFilterType
Definition: mpegts.c:56
#define MAX_MP4_DESCR_COUNT
Definition: mpegts.c:47
#define MKTAG(a, b, c, d)
Definition: common.h:341
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:919
static void mpegts_find_stream_type(AVStream *st, uint32_t stream_type, const StreamType *types)
Definition: mpegts.c:762
void avpriv_mpegts_parse_close(MpegTSContext *ts)
Definition: mpegts.c:2833
int au_len
Definition: mpegts.h:81
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1092
This structure stores compressed data.
Definition: avcodec.h:1410
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:683
static char * getstr8(const uint8_t **pp, const uint8_t *p_end)
Definition: mpegts.c:631
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1426
A dummy ID pointing at the start of subtitle codecs.
Definition: avcodec.h:509
#define FFMAX3(a, b, c)
Definition: common.h:91
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240
#define av_unused
Definition: attributes.h:118
AVProgram ** programs
Definition: avformat.h:1437
#define MP4SLDescrTag
Definition: isom.h:225
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:2389
#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:1460