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mpegts.c
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1 /*
2  * MPEG-2 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 synchronization if
42  * synchronization is lost */
43 #define MAX_RESYNC_SIZE 65536
44 
45 #define MAX_PES_PAYLOAD 200 * 1024
46 
47 #define MAX_MP4_DESCR_COUNT 16
48 
49 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
50  do { \
51  if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
52  (modulus) = (dividend) % (divisor); \
53  (prev_dividend) = (dividend); \
54  } while (0)
55 
60 };
61 
62 typedef struct MpegTSFilter MpegTSFilter;
63 
64 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
65  int is_start, int64_t pos);
66 
67 typedef struct MpegTSPESFilter {
69  void *opaque;
71 
72 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
73 
74 typedef void SetServiceCallback (void *opaque, int ret);
75 
76 typedef struct MpegTSSectionFilter {
79  int last_ver;
80  unsigned crc;
81  unsigned last_crc;
83  unsigned int check_crc : 1;
84  unsigned int end_of_section_reached : 1;
86  void *opaque;
88 
89 struct MpegTSFilter {
90  int pid;
91  int es_id;
92  int last_cc; /* last cc code (-1 if first packet) */
93  int64_t last_pcr;
95  union {
98  } u;
99 };
100 
101 #define MAX_PIDS_PER_PROGRAM 64
102 struct Program {
103  unsigned int id; // program id/service id
104  unsigned int nb_pids;
105  unsigned int pids[MAX_PIDS_PER_PROGRAM];
106 
107  /** have we found pmt for this program */
109 };
110 
112  const AVClass *class;
113  /* user data */
115  /** raw packet size, including FEC if present */
117 
118  int size_stat[3];
120 #define SIZE_STAT_THRESHOLD 10
121 
122  int64_t pos47_full;
123 
124  /** if true, all pids are analyzed to find streams */
126 
127  /** compute exact PCR for each transport stream packet */
129 
130  /** fix dvb teletext pts */
132 
133  int64_t cur_pcr; /**< used to estimate the exact PCR */
134  int pcr_incr; /**< used to estimate the exact PCR */
135 
136  /* data needed to handle file based ts */
137  /** stop parsing loop */
139  /** packet containing Audio/Video data */
141  /** to detect seek */
142  int64_t last_pos;
143 
146 
148 
150 
151  /******************************************/
152  /* private mpegts data */
153  /* scan context */
154  /** structure to keep track of Program->pids mapping */
155  unsigned int nb_prg;
156  struct Program *prg;
157 
159  /** filters for various streams specified by PMT + for the PAT and PMT */
162 };
163 
164 #define MPEGTS_OPTIONS \
165  { "resync_size", "set size limit for looking up a new synchronization", offsetof(MpegTSContext, resync_size), AV_OPT_TYPE_INT, { .i64 = MAX_RESYNC_SIZE}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }
166 
167 static const AVOption options[] = {
169  {"fix_teletext_pts", "try to fix pts values of dvb teletext streams", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_BOOL,
170  {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
171  {"ts_packetsize", "output option carrying the raw packet size", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
173  {"scan_all_pmts", "scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_BOOL,
174  { .i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
175  {"skip_changes", "skip changing / adding streams / programs", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_BOOL,
176  {.i64 = 0}, 0, 1, 0 },
177  {"skip_clear", "skip clearing programs", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_BOOL,
178  {.i64 = 0}, 0, 1, 0 },
179  { NULL },
180 };
181 
182 static const AVClass mpegts_class = {
183  .class_name = "mpegts demuxer",
184  .item_name = av_default_item_name,
185  .option = options,
186  .version = LIBAVUTIL_VERSION_INT,
187 };
188 
189 static const AVOption raw_options[] = {
191  { "compute_pcr", "compute exact PCR for each transport stream packet",
192  offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_BOOL,
193  { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
194  { "ts_packetsize", "output option carrying the raw packet size",
195  offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
196  { .i64 = 0 }, 0, 0,
198  { NULL },
199 };
200 
201 static const AVClass mpegtsraw_class = {
202  .class_name = "mpegtsraw demuxer",
203  .item_name = av_default_item_name,
204  .option = raw_options,
205  .version = LIBAVUTIL_VERSION_INT,
206 };
207 
208 /* TS stream handling */
209 
216 };
217 
218 /* enough for PES header + length */
219 #define PES_START_SIZE 6
220 #define PES_HEADER_SIZE 9
221 #define MAX_PES_HEADER_SIZE (9 + 255)
222 
223 typedef struct PESContext {
224  int pid;
225  int pcr_pid; /**< if -1 then all packets containing PCR are considered */
230  AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
232  /* used to get the format */
234  int flags; /**< copied to the AVPacket flags */
239  int64_t pts, dts;
240  int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
244 } PESContext;
245 
247 
248 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
249 {
250  int i;
251  for (i = 0; i < ts->nb_prg; i++) {
252  if (ts->prg[i].id == programid) {
253  return &ts->prg[i];
254  }
255  }
256  return NULL;
257 }
258 
259 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
260 {
261  AVProgram *prg = NULL;
262  int i;
263 
264  for (i = 0; i < ts->stream->nb_programs; i++)
265  if (ts->stream->programs[i]->id == programid) {
266  prg = ts->stream->programs[i];
267  break;
268  }
269  if (!prg)
270  return;
271  prg->nb_stream_indexes = 0;
272 }
273 
274 static void clear_program(MpegTSContext *ts, unsigned int programid)
275 {
276  int i;
277 
278  clear_avprogram(ts, programid);
279  for (i = 0; i < ts->nb_prg; i++)
280  if (ts->prg[i].id == programid) {
281  ts->prg[i].nb_pids = 0;
282  ts->prg[i].pmt_found = 0;
283  }
284 }
285 
287 {
288  av_freep(&ts->prg);
289  ts->nb_prg = 0;
290 }
291 
292 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
293 {
294  struct Program *p;
295  if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
296  ts->nb_prg = 0;
297  return;
298  }
299  p = &ts->prg[ts->nb_prg];
300  p->id = programid;
301  p->nb_pids = 0;
302  p->pmt_found = 0;
303  ts->nb_prg++;
304 }
305 
306 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
307  unsigned int pid)
308 {
309  struct Program *p = get_program(ts, programid);
310  int i;
311  if (!p)
312  return;
313 
314  if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
315  return;
316 
317  for (i = 0; i < p->nb_pids; i++)
318  if (p->pids[i] == pid)
319  return;
320 
321  p->pids[p->nb_pids++] = pid;
322 }
323 
324 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
325 {
326  struct Program *p = get_program(ts, programid);
327  if (!p)
328  return;
329 
330  p->pmt_found = 1;
331 }
332 
333 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
334 {
335  int i;
336  for (i = 0; i < s->nb_programs; i++) {
337  if (s->programs[i]->id == programid) {
338  s->programs[i]->pcr_pid = pid;
339  break;
340  }
341  }
342 }
343 
344 /**
345  * @brief discard_pid() decides if the pid is to be discarded according
346  * to caller's programs selection
347  * @param ts : - TS context
348  * @param pid : - pid
349  * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
350  * 0 otherwise
351  */
352 static int discard_pid(MpegTSContext *ts, unsigned int pid)
353 {
354  int i, j, k;
355  int used = 0, discarded = 0;
356  struct Program *p;
357 
358  /* If none of the programs have .discard=AVDISCARD_ALL then there's
359  * no way we have to discard this packet */
360  for (k = 0; k < ts->stream->nb_programs; k++)
361  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
362  break;
363  if (k == ts->stream->nb_programs)
364  return 0;
365 
366  for (i = 0; i < ts->nb_prg; i++) {
367  p = &ts->prg[i];
368  for (j = 0; j < p->nb_pids; j++) {
369  if (p->pids[j] != pid)
370  continue;
371  // is program with id p->id set to be discarded?
372  for (k = 0; k < ts->stream->nb_programs; k++) {
373  if (ts->stream->programs[k]->id == p->id) {
374  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
375  discarded++;
376  else
377  used++;
378  }
379  }
380  }
381  }
382 
383  return !used && discarded;
384 }
385 
386 /**
387  * Assemble PES packets out of TS packets, and then call the "section_cb"
388  * function when they are complete.
389  */
391  const uint8_t *buf, int buf_size, int is_start)
392 {
393  MpegTSSectionFilter *tss = &tss1->u.section_filter;
394  int len;
395 
396  if (is_start) {
397  memcpy(tss->section_buf, buf, buf_size);
398  tss->section_index = buf_size;
399  tss->section_h_size = -1;
400  tss->end_of_section_reached = 0;
401  } else {
402  if (tss->end_of_section_reached)
403  return;
404  len = 4096 - tss->section_index;
405  if (buf_size < len)
406  len = buf_size;
407  memcpy(tss->section_buf + tss->section_index, buf, len);
408  tss->section_index += len;
409  }
410 
411  /* compute section length if possible */
412  if (tss->section_h_size == -1 && tss->section_index >= 3) {
413  len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
414  if (len > 4096)
415  return;
416  tss->section_h_size = len;
417  }
418 
419  if (tss->section_h_size != -1 &&
420  tss->section_index >= tss->section_h_size) {
421  int crc_valid = 1;
422  tss->end_of_section_reached = 1;
423 
424  if (tss->check_crc) {
425  crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
426  if (tss->section_h_size >= 4)
427  tss->crc = AV_RB32(tss->section_buf + tss->section_h_size - 4);
428 
429  if (crc_valid) {
430  ts->crc_validity[ tss1->pid ] = 100;
431  }else if (ts->crc_validity[ tss1->pid ] > -10) {
432  ts->crc_validity[ tss1->pid ]--;
433  }else
434  crc_valid = 2;
435  }
436  if (crc_valid) {
437  tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
438  if (crc_valid != 1)
439  tss->last_ver = -1;
440  }
441  }
442 }
443 
444 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
445  enum MpegTSFilterType type)
446 {
448 
449  av_log(ts->stream, AV_LOG_TRACE, "Filter: pid=0x%x type=%d\n", pid, type);
450 
451  if (pid >= NB_PID_MAX || ts->pids[pid])
452  return NULL;
453  filter = av_mallocz(sizeof(MpegTSFilter));
454  if (!filter)
455  return NULL;
456  ts->pids[pid] = filter;
457 
458  filter->type = type;
459  filter->pid = pid;
460  filter->es_id = -1;
461  filter->last_cc = -1;
462  filter->last_pcr= -1;
463 
464  return filter;
465 }
466 
468  unsigned int pid,
469  SectionCallback *section_cb,
470  void *opaque,
471  int check_crc)
472 {
474  MpegTSSectionFilter *sec;
475 
476  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
477  return NULL;
478  sec = &filter->u.section_filter;
479  sec->section_cb = section_cb;
480  sec->opaque = opaque;
482  sec->check_crc = check_crc;
483  sec->last_ver = -1;
484 
485  if (!sec->section_buf) {
486  av_free(filter);
487  return NULL;
488  }
489  return filter;
490 }
491 
492 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
493  PESCallback *pes_cb,
494  void *opaque)
495 {
497  MpegTSPESFilter *pes;
498 
499  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
500  return NULL;
501 
502  pes = &filter->u.pes_filter;
503  pes->pes_cb = pes_cb;
504  pes->opaque = opaque;
505  return filter;
506 }
507 
508 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
509 {
510  return mpegts_open_filter(ts, pid, MPEGTS_PCR);
511 }
512 
514 {
515  int pid;
516 
517  pid = filter->pid;
518  if (filter->type == MPEGTS_SECTION)
520  else if (filter->type == MPEGTS_PES) {
521  PESContext *pes = filter->u.pes_filter.opaque;
522  av_buffer_unref(&pes->buffer);
523  /* referenced private data will be freed later in
524  * avformat_close_input */
525  if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
526  av_freep(&filter->u.pes_filter.opaque);
527  }
528  }
529 
530  av_free(filter);
531  ts->pids[pid] = NULL;
532 }
533 
534 static int analyze(const uint8_t *buf, int size, int packet_size,
535  int probe)
536 {
537  int stat[TS_MAX_PACKET_SIZE];
538  int stat_all = 0;
539  int i;
540  int best_score = 0;
541 
542  memset(stat, 0, packet_size * sizeof(*stat));
543 
544  for (i = 0; i < size - 3; i++) {
545  if (buf[i] == 0x47) {
546  int pid = AV_RB16(buf+1) & 0x1FFF;
547  int asc = buf[i + 3] & 0x30;
548  if (!probe || pid == 0x1FFF || asc) {
549  int x = i % packet_size;
550  stat[x]++;
551  stat_all++;
552  if (stat[x] > best_score) {
553  best_score = stat[x];
554  }
555  }
556  }
557  }
558 
559  return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
560 }
561 
562 /* autodetect fec presence. Must have at least 1024 bytes */
563 static int get_packet_size(const uint8_t *buf, int size)
564 {
565  int score, fec_score, dvhs_score;
566 
567  if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
568  return AVERROR_INVALIDDATA;
569 
570  score = analyze(buf, size, TS_PACKET_SIZE, 0);
571  dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, 0);
572  fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, 0);
573  av_log(NULL, AV_LOG_TRACE, "score: %d, dvhs_score: %d, fec_score: %d \n",
574  score, dvhs_score, fec_score);
575 
576  if (score > fec_score && score > dvhs_score)
577  return TS_PACKET_SIZE;
578  else if (dvhs_score > score && dvhs_score > fec_score)
579  return TS_DVHS_PACKET_SIZE;
580  else if (score < fec_score && dvhs_score < fec_score)
581  return TS_FEC_PACKET_SIZE;
582  else
583  return AVERROR_INVALIDDATA;
584 }
585 
586 typedef struct SectionHeader {
588  uint16_t id;
592 } SectionHeader;
593 
595 {
596  if (h->version == tssf->last_ver && tssf->last_crc == tssf->crc)
597  return 1;
598 
599  tssf->last_ver = h->version;
600  tssf->last_crc = tssf->crc;
601 
602  return 0;
603 }
604 
605 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
606 {
607  const uint8_t *p;
608  int c;
609 
610  p = *pp;
611  if (p >= p_end)
612  return AVERROR_INVALIDDATA;
613  c = *p++;
614  *pp = p;
615  return c;
616 }
617 
618 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
619 {
620  const uint8_t *p;
621  int c;
622 
623  p = *pp;
624  if (1 >= p_end - p)
625  return AVERROR_INVALIDDATA;
626  c = AV_RB16(p);
627  p += 2;
628  *pp = p;
629  return c;
630 }
631 
632 /* read and allocate a DVB string preceded by its length */
633 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
634 {
635  int len;
636  const uint8_t *p;
637  char *str;
638 
639  p = *pp;
640  len = get8(&p, p_end);
641  if (len < 0)
642  return NULL;
643  if (len > p_end - p)
644  return NULL;
645  str = av_malloc(len + 1);
646  if (!str)
647  return NULL;
648  memcpy(str, p, len);
649  str[len] = '\0';
650  p += len;
651  *pp = p;
652  return str;
653 }
654 
656  const uint8_t **pp, const uint8_t *p_end)
657 {
658  int val;
659 
660  val = get8(pp, p_end);
661  if (val < 0)
662  return val;
663  h->tid = val;
664  *pp += 2;
665  val = get16(pp, p_end);
666  if (val < 0)
667  return val;
668  h->id = val;
669  val = get8(pp, p_end);
670  if (val < 0)
671  return val;
672  h->version = (val >> 1) & 0x1f;
673  val = get8(pp, p_end);
674  if (val < 0)
675  return val;
676  h->sec_num = val;
677  val = get8(pp, p_end);
678  if (val < 0)
679  return val;
680  h->last_sec_num = val;
681  return 0;
682 }
683 
684 typedef struct StreamType {
685  uint32_t stream_type;
688 } StreamType;
689 
690 static const StreamType ISO_types[] = {
697  /* Makito encoder sets stream type 0x11 for AAC,
698  * so auto-detect LOAS/LATM instead of hardcoding it. */
699 #if !CONFIG_LOAS_DEMUXER
700  { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
701 #endif
710  { 0 },
711 };
712 
713 static const StreamType HDMV_types[] = {
719  { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
720  { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
721  { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
722  { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
725  { 0 },
726 };
727 
728 /* ATSC ? */
729 static const StreamType MISC_types[] = {
732  { 0 },
733 };
734 
735 static const StreamType REGD_types[] = {
736  { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
737  { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
738  { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
739  { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
740  { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
741  { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
742  { MKTAG('E', 'A', 'C', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
743  { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
744  { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
745  { MKTAG('I', 'D', '3', ' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
746  { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
747  { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
748  { 0 },
749 };
750 
751 static const StreamType METADATA_types[] = {
752  { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
753  { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
754  { 0 },
755 };
756 
757 /* descriptor present */
758 static const StreamType DESC_types[] = {
759  { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
760  { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
763  { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
764  { 0 },
765 };
766 
768  uint32_t stream_type,
769  const StreamType *types)
770 {
771  for (; types->stream_type; types++)
772  if (stream_type == types->stream_type) {
773  if (st->codecpar->codec_type != types->codec_type ||
774  st->codecpar->codec_id != types->codec_id) {
775  st->codecpar->codec_type = types->codec_type;
776  st->codecpar->codec_id = types->codec_id;
777  st->internal->need_context_update = 1;
778  }
779  st->request_probe = 0;
780  return;
781  }
782 }
783 
785  uint32_t stream_type, uint32_t prog_reg_desc)
786 {
787  int old_codec_type = st->codecpar->codec_type;
788  int old_codec_id = st->codecpar->codec_id;
789  int old_codec_tag = st->codecpar->codec_tag;
790 
791  if (avcodec_is_open(st->internal->avctx)) {
792  av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, internal codec is open\n");
793  return 0;
794  }
795 
796  avpriv_set_pts_info(st, 33, 1, 90000);
797  st->priv_data = pes;
801  pes->st = st;
802  pes->stream_type = stream_type;
803 
804  av_log(pes->stream, AV_LOG_DEBUG,
805  "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
806  st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
807 
808  st->codecpar->codec_tag = pes->stream_type;
809 
810  mpegts_find_stream_type(st, pes->stream_type, ISO_types);
811  if (pes->stream_type == 4)
812  st->request_probe = 50;
813  if ((prog_reg_desc == AV_RL32("HDMV") ||
814  prog_reg_desc == AV_RL32("HDPR")) &&
816  mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
817  if (pes->stream_type == 0x83) {
818  // HDMV TrueHD streams also contain an AC3 coded version of the
819  // audio track - add a second stream for this
820  AVStream *sub_st;
821  // priv_data cannot be shared between streams
822  PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
823  if (!sub_pes)
824  return AVERROR(ENOMEM);
825  memcpy(sub_pes, pes, sizeof(*sub_pes));
826 
827  sub_st = avformat_new_stream(pes->stream, NULL);
828  if (!sub_st) {
829  av_free(sub_pes);
830  return AVERROR(ENOMEM);
831  }
832 
833  sub_st->id = pes->pid;
834  avpriv_set_pts_info(sub_st, 33, 1, 90000);
835  sub_st->priv_data = sub_pes;
837  sub_st->codecpar->codec_id = AV_CODEC_ID_AC3;
839  sub_pes->sub_st = pes->sub_st = sub_st;
840  }
841  }
842  if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
843  mpegts_find_stream_type(st, pes->stream_type, MISC_types);
844  if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
845  st->codecpar->codec_id = old_codec_id;
846  st->codecpar->codec_type = old_codec_type;
847  }
848  if ((st->codecpar->codec_id == AV_CODEC_ID_NONE ||
849  (st->request_probe > 0 && st->request_probe < AVPROBE_SCORE_STREAM_RETRY / 5)) &&
850  st->probe_packets > 0 &&
851  stream_type == STREAM_TYPE_PRIVATE_DATA) {
855  }
856 
857  /* queue a context update if properties changed */
858  if (old_codec_type != st->codecpar->codec_type ||
859  old_codec_id != st->codecpar->codec_id ||
860  old_codec_tag != st->codecpar->codec_tag)
861  st->internal->need_context_update = 1;
862 
863  return 0;
864 }
865 
867 {
868  pes->pts = AV_NOPTS_VALUE;
869  pes->dts = AV_NOPTS_VALUE;
870  pes->data_index = 0;
871  pes->flags = 0;
872  av_buffer_unref(&pes->buffer);
873 }
874 
876 {
877  char *sd;
878 
879  av_init_packet(pkt);
880 
881  pkt->buf = pes->buffer;
882  pkt->data = pes->buffer->data;
883  pkt->size = pes->data_index;
884 
885  if (pes->total_size != MAX_PES_PAYLOAD &&
886  pes->pes_header_size + pes->data_index != pes->total_size +
887  PES_START_SIZE) {
888  av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
889  pes->flags |= AV_PKT_FLAG_CORRUPT;
890  }
891  memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
892 
893  // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
894  if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
895  pkt->stream_index = pes->sub_st->index;
896  else
897  pkt->stream_index = pes->st->index;
898  pkt->pts = pes->pts;
899  pkt->dts = pes->dts;
900  /* store position of first TS packet of this PES packet */
901  pkt->pos = pes->ts_packet_pos;
902  pkt->flags = pes->flags;
903 
904  pes->buffer = NULL;
906 
908  if (!sd)
909  return AVERROR(ENOMEM);
910  *sd = pes->stream_id;
911 
912  return 0;
913 }
914 
915 static uint64_t get_ts64(GetBitContext *gb, int bits)
916 {
917  if (get_bits_left(gb) < bits)
918  return AV_NOPTS_VALUE;
919  return get_bits64(gb, bits);
920 }
921 
923  const uint8_t *buf, int buf_size)
924 {
925  GetBitContext gb;
926  int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
927  int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
928  int dts_flag = -1, cts_flag = -1;
929  int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
930  uint8_t buf_padded[128 + AV_INPUT_BUFFER_PADDING_SIZE];
931  int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - AV_INPUT_BUFFER_PADDING_SIZE);
932 
933  memcpy(buf_padded, buf, buf_padded_size);
934 
935  init_get_bits(&gb, buf_padded, buf_padded_size * 8);
936 
937  if (sl->use_au_start)
938  au_start_flag = get_bits1(&gb);
939  if (sl->use_au_end)
940  au_end_flag = get_bits1(&gb);
941  if (!sl->use_au_start && !sl->use_au_end)
942  au_start_flag = au_end_flag = 1;
943  if (sl->ocr_len > 0)
944  ocr_flag = get_bits1(&gb);
945  if (sl->use_idle)
946  idle_flag = get_bits1(&gb);
947  if (sl->use_padding)
948  padding_flag = get_bits1(&gb);
949  if (padding_flag)
950  padding_bits = get_bits(&gb, 3);
951 
952  if (!idle_flag && (!padding_flag || padding_bits != 0)) {
953  if (sl->packet_seq_num_len)
955  if (sl->degr_prior_len)
956  if (get_bits1(&gb))
957  skip_bits(&gb, sl->degr_prior_len);
958  if (ocr_flag)
959  skip_bits_long(&gb, sl->ocr_len);
960  if (au_start_flag) {
961  if (sl->use_rand_acc_pt)
962  get_bits1(&gb);
963  if (sl->au_seq_num_len > 0)
964  skip_bits_long(&gb, sl->au_seq_num_len);
965  if (sl->use_timestamps) {
966  dts_flag = get_bits1(&gb);
967  cts_flag = get_bits1(&gb);
968  }
969  }
970  if (sl->inst_bitrate_len)
971  inst_bitrate_flag = get_bits1(&gb);
972  if (dts_flag == 1)
973  dts = get_ts64(&gb, sl->timestamp_len);
974  if (cts_flag == 1)
975  cts = get_ts64(&gb, sl->timestamp_len);
976  if (sl->au_len > 0)
977  skip_bits_long(&gb, sl->au_len);
978  if (inst_bitrate_flag)
980  }
981 
982  if (dts != AV_NOPTS_VALUE)
983  pes->dts = dts;
984  if (cts != AV_NOPTS_VALUE)
985  pes->pts = cts;
986 
987  if (sl->timestamp_len && sl->timestamp_res)
989 
990  return (get_bits_count(&gb) + 7) >> 3;
991 }
992 
993 /* return non zero if a packet could be constructed */
995  const uint8_t *buf, int buf_size, int is_start,
996  int64_t pos)
997 {
998  PESContext *pes = filter->u.pes_filter.opaque;
999  MpegTSContext *ts = pes->ts;
1000  const uint8_t *p;
1001  int ret, len, code;
1002 
1003  if (!ts->pkt)
1004  return 0;
1005 
1006  if (is_start) {
1007  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1008  ret = new_pes_packet(pes, ts->pkt);
1009  if (ret < 0)
1010  return ret;
1011  ts->stop_parse = 1;
1012  } else {
1014  }
1015  pes->state = MPEGTS_HEADER;
1016  pes->ts_packet_pos = pos;
1017  }
1018  p = buf;
1019  while (buf_size > 0) {
1020  switch (pes->state) {
1021  case MPEGTS_HEADER:
1022  len = PES_START_SIZE - pes->data_index;
1023  if (len > buf_size)
1024  len = buf_size;
1025  memcpy(pes->header + pes->data_index, p, len);
1026  pes->data_index += len;
1027  p += len;
1028  buf_size -= len;
1029  if (pes->data_index == PES_START_SIZE) {
1030  /* we got all the PES or section header. We can now
1031  * decide */
1032  if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
1033  pes->header[2] == 0x01) {
1034  /* it must be an MPEG-2 PES stream */
1035  code = pes->header[3] | 0x100;
1036  av_log(pes->stream, AV_LOG_TRACE, "pid=%x pes_code=%#x\n", pes->pid,
1037  code);
1038  pes->stream_id = pes->header[3];
1039 
1040  if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
1041  (!pes->sub_st ||
1042  pes->sub_st->discard == AVDISCARD_ALL)) ||
1043  code == 0x1be) /* padding_stream */
1044  goto skip;
1045 
1046  /* stream not present in PMT */
1047  if (!pes->st) {
1048  if (ts->skip_changes)
1049  goto skip;
1050 
1051  pes->st = avformat_new_stream(ts->stream, NULL);
1052  if (!pes->st)
1053  return AVERROR(ENOMEM);
1054  pes->st->id = pes->pid;
1055  mpegts_set_stream_info(pes->st, pes, 0, 0);
1056  }
1057 
1058  pes->total_size = AV_RB16(pes->header + 4);
1059  /* NOTE: a zero total size means the PES size is
1060  * unbounded */
1061  if (!pes->total_size)
1062  pes->total_size = MAX_PES_PAYLOAD;
1063 
1064  /* allocate pes buffer */
1065  pes->buffer = av_buffer_alloc(pes->total_size +
1067  if (!pes->buffer)
1068  return AVERROR(ENOMEM);
1069 
1070  if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1071  code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1072  code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1073  code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1074  pes->state = MPEGTS_PESHEADER;
1075  if (pes->st->codecpar->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1076  av_log(pes->stream, AV_LOG_TRACE,
1077  "pid=%x stream_type=%x probing\n",
1078  pes->pid,
1079  pes->stream_type);
1080  pes->st->request_probe = 1;
1081  }
1082  } else {
1083  pes->pes_header_size = 6;
1084  pes->state = MPEGTS_PAYLOAD;
1085  pes->data_index = 0;
1086  }
1087  } else {
1088  /* otherwise, it should be a table */
1089  /* skip packet */
1090 skip:
1091  pes->state = MPEGTS_SKIP;
1092  continue;
1093  }
1094  }
1095  break;
1096  /**********************************************/
1097  /* PES packing parsing */
1098  case MPEGTS_PESHEADER:
1099  len = PES_HEADER_SIZE - pes->data_index;
1100  if (len < 0)
1101  return AVERROR_INVALIDDATA;
1102  if (len > buf_size)
1103  len = buf_size;
1104  memcpy(pes->header + pes->data_index, p, len);
1105  pes->data_index += len;
1106  p += len;
1107  buf_size -= len;
1108  if (pes->data_index == PES_HEADER_SIZE) {
1109  pes->pes_header_size = pes->header[8] + 9;
1111  }
1112  break;
1113  case MPEGTS_PESHEADER_FILL:
1114  len = pes->pes_header_size - pes->data_index;
1115  if (len < 0)
1116  return AVERROR_INVALIDDATA;
1117  if (len > buf_size)
1118  len = buf_size;
1119  memcpy(pes->header + pes->data_index, p, len);
1120  pes->data_index += len;
1121  p += len;
1122  buf_size -= len;
1123  if (pes->data_index == pes->pes_header_size) {
1124  const uint8_t *r;
1125  unsigned int flags, pes_ext, skip;
1126 
1127  flags = pes->header[7];
1128  r = pes->header + 9;
1129  pes->pts = AV_NOPTS_VALUE;
1130  pes->dts = AV_NOPTS_VALUE;
1131  if ((flags & 0xc0) == 0x80) {
1132  pes->dts = pes->pts = ff_parse_pes_pts(r);
1133  r += 5;
1134  } else if ((flags & 0xc0) == 0xc0) {
1135  pes->pts = ff_parse_pes_pts(r);
1136  r += 5;
1137  pes->dts = ff_parse_pes_pts(r);
1138  r += 5;
1139  }
1140  pes->extended_stream_id = -1;
1141  if (flags & 0x01) { /* PES extension */
1142  pes_ext = *r++;
1143  /* Skip PES private data, program packet sequence counter and P-STD buffer */
1144  skip = (pes_ext >> 4) & 0xb;
1145  skip += skip & 0x9;
1146  r += skip;
1147  if ((pes_ext & 0x41) == 0x01 &&
1148  (r + 2) <= (pes->header + pes->pes_header_size)) {
1149  /* PES extension 2 */
1150  if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1151  pes->extended_stream_id = r[1];
1152  }
1153  }
1154 
1155  /* we got the full header. We parse it and get the payload */
1156  pes->state = MPEGTS_PAYLOAD;
1157  pes->data_index = 0;
1158  if (pes->stream_type == 0x12 && buf_size > 0) {
1159  int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1160  buf_size);
1161  pes->pes_header_size += sl_header_bytes;
1162  p += sl_header_bytes;
1163  buf_size -= sl_header_bytes;
1164  }
1165  if (pes->stream_type == 0x15 && buf_size >= 5) {
1166  /* skip metadata access unit header */
1167  pes->pes_header_size += 5;
1168  p += 5;
1169  buf_size -= 5;
1170  }
1171  if ( pes->ts->fix_teletext_pts
1174  ) {
1175  AVProgram *p = NULL;
1176  while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1177  if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1178  MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1179  if (f) {
1180  AVStream *st = NULL;
1181  if (f->type == MPEGTS_PES) {
1182  PESContext *pcrpes = f->u.pes_filter.opaque;
1183  if (pcrpes)
1184  st = pcrpes->st;
1185  } else if (f->type == MPEGTS_PCR) {
1186  int i;
1187  for (i = 0; i < p->nb_stream_indexes; i++) {
1188  AVStream *pst = pes->stream->streams[p->stream_index[i]];
1189  if (pst->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
1190  st = pst;
1191  }
1192  }
1193  if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1194  // teletext packets do not always have correct timestamps,
1195  // the standard says they should be handled after 40.6 ms at most,
1196  // and the pcr error to this packet should be no more than 100 ms.
1197  // TODO: we should interpolate the PCR, not just use the last one
1198  int64_t pcr = f->last_pcr / 300;
1201  if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1202  pes->pts = pes->dts = pcr;
1203  } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT &&
1204  pes->dts > pcr + 3654 + 9000) {
1205  pes->pts = pes->dts = pcr + 3654 + 9000;
1206  } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE &&
1207  pes->dts > pcr + 10*90000) { //10sec
1208  pes->pts = pes->dts = pcr + 3654 + 9000;
1209  }
1210  break;
1211  }
1212  }
1213  }
1214  }
1215  }
1216  }
1217  break;
1218  case MPEGTS_PAYLOAD:
1219  if (pes->buffer) {
1220  if (pes->data_index > 0 &&
1221  pes->data_index + buf_size > pes->total_size) {
1222  ret = new_pes_packet(pes, ts->pkt);
1223  if (ret < 0)
1224  return ret;
1225  pes->total_size = MAX_PES_PAYLOAD;
1226  pes->buffer = av_buffer_alloc(pes->total_size +
1228  if (!pes->buffer)
1229  return AVERROR(ENOMEM);
1230  ts->stop_parse = 1;
1231  } else if (pes->data_index == 0 &&
1232  buf_size > pes->total_size) {
1233  // pes packet size is < ts size packet and pes data is padded with 0xff
1234  // not sure if this is legal in ts but see issue #2392
1235  buf_size = pes->total_size;
1236  }
1237  memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1238  pes->data_index += buf_size;
1239  /* emit complete packets with known packet size
1240  * decreases demuxer delay for infrequent packets like subtitles from
1241  * a couple of seconds to milliseconds for properly muxed files.
1242  * total_size is the number of bytes following pes_packet_length
1243  * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1244  if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1245  pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1246  ts->stop_parse = 1;
1247  ret = new_pes_packet(pes, ts->pkt);
1248  if (ret < 0)
1249  return ret;
1250  }
1251  }
1252  buf_size = 0;
1253  break;
1254  case MPEGTS_SKIP:
1255  buf_size = 0;
1256  break;
1257  }
1258  }
1259 
1260  return 0;
1261 }
1262 
1263 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1264 {
1265  MpegTSFilter *tss;
1266  PESContext *pes;
1267 
1268  /* if no pid found, then add a pid context */
1269  pes = av_mallocz(sizeof(PESContext));
1270  if (!pes)
1271  return 0;
1272  pes->ts = ts;
1273  pes->stream = ts->stream;
1274  pes->pid = pid;
1275  pes->pcr_pid = pcr_pid;
1276  pes->state = MPEGTS_SKIP;
1277  pes->pts = AV_NOPTS_VALUE;
1278  pes->dts = AV_NOPTS_VALUE;
1279  tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1280  if (!tss) {
1281  av_free(pes);
1282  return 0;
1283  }
1284  return pes;
1285 }
1286 
1287 #define MAX_LEVEL 4
1288 typedef struct MP4DescrParseContext {
1295  int level;
1298 
1300  const uint8_t *buf, unsigned size,
1301  Mp4Descr *descr, int max_descr_count)
1302 {
1303  int ret;
1304  if (size > (1 << 30))
1305  return AVERROR_INVALIDDATA;
1306 
1307  if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1308  NULL, NULL, NULL, NULL)) < 0)
1309  return ret;
1310 
1311  d->s = s;
1312  d->level = 0;
1313  d->descr_count = 0;
1314  d->descr = descr;
1315  d->active_descr = NULL;
1316  d->max_descr_count = max_descr_count;
1317 
1318  return 0;
1319 }
1320 
1321 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1322 {
1323  int64_t new_off = avio_tell(pb);
1324  (*len) -= new_off - *off;
1325  *off = new_off;
1326 }
1327 
1328 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1329  int target_tag);
1330 
1331 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1332 {
1333  while (len > 0) {
1334  int ret = parse_mp4_descr(d, off, len, 0);
1335  if (ret < 0)
1336  return ret;
1337  update_offsets(&d->pb, &off, &len);
1338  }
1339  return 0;
1340 }
1341 
1342 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1343 {
1344  avio_rb16(&d->pb); // ID
1345  avio_r8(&d->pb);
1346  avio_r8(&d->pb);
1347  avio_r8(&d->pb);
1348  avio_r8(&d->pb);
1349  avio_r8(&d->pb);
1350  update_offsets(&d->pb, &off, &len);
1351  return parse_mp4_descr_arr(d, off, len);
1352 }
1353 
1354 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1355 {
1356  int id_flags;
1357  if (len < 2)
1358  return 0;
1359  id_flags = avio_rb16(&d->pb);
1360  if (!(id_flags & 0x0020)) { // URL_Flag
1361  update_offsets(&d->pb, &off, &len);
1362  return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1363  } else {
1364  return 0;
1365  }
1366 }
1367 
1368 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1369 {
1370  int es_id = 0;
1371  int ret = 0;
1372 
1373  if (d->descr_count >= d->max_descr_count)
1374  return AVERROR_INVALIDDATA;
1375  ff_mp4_parse_es_descr(&d->pb, &es_id);
1376  d->active_descr = d->descr + (d->descr_count++);
1377 
1378  d->active_descr->es_id = es_id;
1379  update_offsets(&d->pb, &off, &len);
1380  if ((ret = parse_mp4_descr(d, off, len, MP4DecConfigDescrTag)) < 0)
1381  return ret;
1382  update_offsets(&d->pb, &off, &len);
1383  if (len > 0)
1384  ret = parse_mp4_descr(d, off, len, MP4SLDescrTag);
1385  d->active_descr = NULL;
1386  return ret;
1387 }
1388 
1390  int len)
1391 {
1392  Mp4Descr *descr = d->active_descr;
1393  if (!descr)
1394  return AVERROR_INVALIDDATA;
1396  if (!descr->dec_config_descr)
1397  return AVERROR(ENOMEM);
1398  descr->dec_config_descr_len = len;
1399  avio_read(&d->pb, descr->dec_config_descr, len);
1400  return 0;
1401 }
1402 
1403 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1404 {
1405  Mp4Descr *descr = d->active_descr;
1406  int predefined;
1407  if (!descr)
1408  return AVERROR_INVALIDDATA;
1409 
1410 #define R8_CHECK_CLIP_MAX(dst, maxv) do { \
1411  descr->sl.dst = avio_r8(&d->pb); \
1412  if (descr->sl.dst > maxv) { \
1413  descr->sl.dst = maxv; \
1414  return AVERROR_INVALIDDATA; \
1415  } \
1416 } while (0)
1417 
1418  predefined = avio_r8(&d->pb);
1419  if (!predefined) {
1420  int lengths;
1421  int flags = avio_r8(&d->pb);
1422  descr->sl.use_au_start = !!(flags & 0x80);
1423  descr->sl.use_au_end = !!(flags & 0x40);
1424  descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1425  descr->sl.use_padding = !!(flags & 0x08);
1426  descr->sl.use_timestamps = !!(flags & 0x04);
1427  descr->sl.use_idle = !!(flags & 0x02);
1428  descr->sl.timestamp_res = avio_rb32(&d->pb);
1429  avio_rb32(&d->pb);
1430  R8_CHECK_CLIP_MAX(timestamp_len, 63);
1431  R8_CHECK_CLIP_MAX(ocr_len, 63);
1432  R8_CHECK_CLIP_MAX(au_len, 31);
1433  descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1434  lengths = avio_rb16(&d->pb);
1435  descr->sl.degr_prior_len = lengths >> 12;
1436  descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1437  descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1438  } else if (!d->predefined_SLConfigDescriptor_seen){
1439  avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1441  }
1442  return 0;
1443 }
1444 
1445 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1446  int target_tag)
1447 {
1448  int tag;
1449  int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1450  int ret = 0;
1451 
1452  update_offsets(&d->pb, &off, &len);
1453  if (len < 0 || len1 > len || len1 <= 0) {
1454  av_log(d->s, AV_LOG_ERROR,
1455  "Tag %x length violation new length %d bytes remaining %d\n",
1456  tag, len1, len);
1457  return AVERROR_INVALIDDATA;
1458  }
1459 
1460  if (d->level++ >= MAX_LEVEL) {
1461  av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1462  ret = AVERROR_INVALIDDATA;
1463  goto done;
1464  }
1465 
1466  if (target_tag && tag != target_tag) {
1467  av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1468  target_tag);
1469  ret = AVERROR_INVALIDDATA;
1470  goto done;
1471  }
1472 
1473  switch (tag) {
1474  case MP4IODescrTag:
1475  ret = parse_MP4IODescrTag(d, off, len1);
1476  break;
1477  case MP4ODescrTag:
1478  ret = parse_MP4ODescrTag(d, off, len1);
1479  break;
1480  case MP4ESDescrTag:
1481  ret = parse_MP4ESDescrTag(d, off, len1);
1482  break;
1483  case MP4DecConfigDescrTag:
1484  ret = parse_MP4DecConfigDescrTag(d, off, len1);
1485  break;
1486  case MP4SLDescrTag:
1487  ret = parse_MP4SLDescrTag(d, off, len1);
1488  break;
1489  }
1490 
1491 
1492 done:
1493  d->level--;
1494  avio_seek(&d->pb, off + len1, SEEK_SET);
1495  return ret;
1496 }
1497 
1498 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1499  Mp4Descr *descr, int *descr_count, int max_descr_count)
1500 {
1502  int ret;
1503 
1504  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1505  if (ret < 0)
1506  return ret;
1507 
1508  ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1509 
1510  *descr_count = d.descr_count;
1511  return ret;
1512 }
1513 
1514 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1515  Mp4Descr *descr, int *descr_count, int max_descr_count)
1516 {
1518  int ret;
1519 
1520  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1521  if (ret < 0)
1522  return ret;
1523 
1524  ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1525 
1526  *descr_count = d.descr_count;
1527  return ret;
1528 }
1529 
1531  int section_len)
1532 {
1533  MpegTSContext *ts = filter->u.section_filter.opaque;
1534  MpegTSSectionFilter *tssf = &filter->u.section_filter;
1535  SectionHeader h;
1536  const uint8_t *p, *p_end;
1537  AVIOContext pb;
1538  int mp4_descr_count = 0;
1539  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1540  int i, pid;
1541  AVFormatContext *s = ts->stream;
1542 
1543  p_end = section + section_len - 4;
1544  p = section;
1545  if (parse_section_header(&h, &p, p_end) < 0)
1546  return;
1547  if (h.tid != M4OD_TID)
1548  return;
1549  if (skip_identical(&h, tssf))
1550  return;
1551 
1552  mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1554 
1555  for (pid = 0; pid < NB_PID_MAX; pid++) {
1556  if (!ts->pids[pid])
1557  continue;
1558  for (i = 0; i < mp4_descr_count; i++) {
1559  PESContext *pes;
1560  AVStream *st;
1561  if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1562  continue;
1563  if (ts->pids[pid]->type != MPEGTS_PES) {
1564  av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1565  continue;
1566  }
1567  pes = ts->pids[pid]->u.pes_filter.opaque;
1568  st = pes->st;
1569  if (!st)
1570  continue;
1571 
1572  pes->sl = mp4_descr[i].sl;
1573 
1574  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1575  mp4_descr[i].dec_config_descr_len, 0,
1576  NULL, NULL, NULL, NULL);
1577  ff_mp4_read_dec_config_descr(s, st, &pb);
1578  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1579  st->codecpar->extradata_size > 0)
1580  st->need_parsing = 0;
1581  if (st->codecpar->codec_id == AV_CODEC_ID_H264 &&
1582  st->codecpar->extradata_size > 0)
1583  st->need_parsing = 0;
1584 
1586  st->internal->need_context_update = 1;
1587  }
1588  }
1589  for (i = 0; i < mp4_descr_count; i++)
1590  av_free(mp4_descr[i].dec_config_descr);
1591 }
1592 
1594  1, 0, 1, 1, 2, 2, 2, 3, 3
1595 };
1596 
1597 static const uint8_t opus_stream_cnt[9] = {
1598  1, 1, 1, 2, 2, 3, 4, 4, 5,
1599 };
1600 
1601 static const uint8_t opus_channel_map[8][8] = {
1602  { 0 },
1603  { 0,1 },
1604  { 0,2,1 },
1605  { 0,1,2,3 },
1606  { 0,4,1,2,3 },
1607  { 0,4,1,2,3,5 },
1608  { 0,4,1,2,3,5,6 },
1609  { 0,6,1,2,3,4,5,7 },
1610 };
1611 
1613  const uint8_t **pp, const uint8_t *desc_list_end,
1614  Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1615  MpegTSContext *ts)
1616 {
1617  const uint8_t *desc_end;
1618  int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1619  char language[252];
1620  int i;
1621 
1622  desc_tag = get8(pp, desc_list_end);
1623  if (desc_tag < 0)
1624  return AVERROR_INVALIDDATA;
1625  desc_len = get8(pp, desc_list_end);
1626  if (desc_len < 0)
1627  return AVERROR_INVALIDDATA;
1628  desc_end = *pp + desc_len;
1629  if (desc_end > desc_list_end)
1630  return AVERROR_INVALIDDATA;
1631 
1632  av_log(fc, AV_LOG_TRACE, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1633 
1634  if ((st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1635  stream_type == STREAM_TYPE_PRIVATE_DATA)
1636  mpegts_find_stream_type(st, desc_tag, DESC_types);
1637 
1638  switch (desc_tag) {
1639  case 0x1E: /* SL descriptor */
1640  desc_es_id = get16(pp, desc_end);
1641  if (desc_es_id < 0)
1642  break;
1643  if (ts && ts->pids[pid])
1644  ts->pids[pid]->es_id = desc_es_id;
1645  for (i = 0; i < mp4_descr_count; i++)
1646  if (mp4_descr[i].dec_config_descr_len &&
1647  mp4_descr[i].es_id == desc_es_id) {
1648  AVIOContext pb;
1649  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1650  mp4_descr[i].dec_config_descr_len, 0,
1651  NULL, NULL, NULL, NULL);
1652  ff_mp4_read_dec_config_descr(fc, st, &pb);
1653  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1654  st->codecpar->extradata_size > 0) {
1655  st->need_parsing = 0;
1656  st->internal->need_context_update = 1;
1657  }
1659  mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1660  }
1661  break;
1662  case 0x1F: /* FMC descriptor */
1663  if (get16(pp, desc_end) < 0)
1664  break;
1665  if (mp4_descr_count > 0 &&
1667  (st->request_probe == 0 && st->codecpar->codec_id == AV_CODEC_ID_NONE) ||
1668  st->request_probe > 0) &&
1669  mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1670  AVIOContext pb;
1671  ffio_init_context(&pb, mp4_descr->dec_config_descr,
1672  mp4_descr->dec_config_descr_len, 0,
1673  NULL, NULL, NULL, NULL);
1674  ff_mp4_read_dec_config_descr(fc, st, &pb);
1675  if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1676  st->codecpar->extradata_size > 0) {
1677  st->request_probe = st->need_parsing = 0;
1679  st->internal->need_context_update = 1;
1680  }
1681  }
1682  break;
1683  case 0x56: /* DVB teletext descriptor */
1684  {
1685  uint8_t *extradata = NULL;
1686  int language_count = desc_len / 5;
1687 
1688  if (desc_len > 0 && desc_len % 5 != 0)
1689  return AVERROR_INVALIDDATA;
1690 
1691  if (language_count > 0) {
1692  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1693  av_assert0(language_count <= sizeof(language) / 4);
1694 
1695  if (st->codecpar->extradata == NULL) {
1696  if (ff_alloc_extradata(st->codecpar, language_count * 2)) {
1697  return AVERROR(ENOMEM);
1698  }
1699  }
1700 
1701  if (st->codecpar->extradata_size < language_count * 2)
1702  return AVERROR_INVALIDDATA;
1703 
1704  extradata = st->codecpar->extradata;
1705 
1706  for (i = 0; i < language_count; i++) {
1707  language[i * 4 + 0] = get8(pp, desc_end);
1708  language[i * 4 + 1] = get8(pp, desc_end);
1709  language[i * 4 + 2] = get8(pp, desc_end);
1710  language[i * 4 + 3] = ',';
1711 
1712  memcpy(extradata, *pp, 2);
1713  extradata += 2;
1714 
1715  *pp += 2;
1716  }
1717 
1718  language[i * 4 - 1] = 0;
1719  av_dict_set(&st->metadata, "language", language, 0);
1720  st->internal->need_context_update = 1;
1721  }
1722  }
1723  break;
1724  case 0x59: /* subtitling descriptor */
1725  {
1726  /* 8 bytes per DVB subtitle substream data:
1727  * ISO_639_language_code (3 bytes),
1728  * subtitling_type (1 byte),
1729  * composition_page_id (2 bytes),
1730  * ancillary_page_id (2 bytes) */
1731  int language_count = desc_len / 8;
1732 
1733  if (desc_len > 0 && desc_len % 8 != 0)
1734  return AVERROR_INVALIDDATA;
1735 
1736  if (language_count > 1) {
1737  avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1738  }
1739 
1740  if (language_count > 0) {
1741  uint8_t *extradata;
1742 
1743  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1744  av_assert0(language_count <= sizeof(language) / 4);
1745 
1746  if (st->codecpar->extradata == NULL) {
1747  if (ff_alloc_extradata(st->codecpar, language_count * 5)) {
1748  return AVERROR(ENOMEM);
1749  }
1750  }
1751 
1752  if (st->codecpar->extradata_size < language_count * 5)
1753  return AVERROR_INVALIDDATA;
1754 
1755  extradata = st->codecpar->extradata;
1756 
1757  for (i = 0; i < language_count; i++) {
1758  language[i * 4 + 0] = get8(pp, desc_end);
1759  language[i * 4 + 1] = get8(pp, desc_end);
1760  language[i * 4 + 2] = get8(pp, desc_end);
1761  language[i * 4 + 3] = ',';
1762 
1763  /* hearing impaired subtitles detection using subtitling_type */
1764  switch (*pp[0]) {
1765  case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1766  case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1767  case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1768  case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1769  case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1770  case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1772  break;
1773  }
1774 
1775  extradata[4] = get8(pp, desc_end); /* subtitling_type */
1776  memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1777  extradata += 5;
1778 
1779  *pp += 4;
1780  }
1781 
1782  language[i * 4 - 1] = 0;
1783  av_dict_set(&st->metadata, "language", language, 0);
1784  st->internal->need_context_update = 1;
1785  }
1786  }
1787  break;
1788  case 0x0a: /* ISO 639 language descriptor */
1789  for (i = 0; i + 4 <= desc_len; i += 4) {
1790  language[i + 0] = get8(pp, desc_end);
1791  language[i + 1] = get8(pp, desc_end);
1792  language[i + 2] = get8(pp, desc_end);
1793  language[i + 3] = ',';
1794  switch (get8(pp, desc_end)) {
1795  case 0x01:
1797  break;
1798  case 0x02:
1800  break;
1801  case 0x03:
1803  break;
1804  }
1805  }
1806  if (i && language[0]) {
1807  language[i - 1] = 0;
1808  av_dict_set(&st->metadata, "language", language, 0);
1809  }
1810  break;
1811  case 0x05: /* registration descriptor */
1812  st->codecpar->codec_tag = bytestream_get_le32(pp);
1813  av_log(fc, AV_LOG_TRACE, "reg_desc=%.4s\n", (char *)&st->codecpar->codec_tag);
1814  if (st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) {
1815  mpegts_find_stream_type(st, st->codecpar->codec_tag, REGD_types);
1816  if (st->codecpar->codec_tag == MKTAG('B', 'S', 'S', 'D'))
1817  st->request_probe = 50;
1818  }
1819  break;
1820  case 0x52: /* stream identifier descriptor */
1821  st->stream_identifier = 1 + get8(pp, desc_end);
1822  break;
1823  case 0x26: /* metadata descriptor */
1824  if (get16(pp, desc_end) == 0xFFFF)
1825  *pp += 4;
1826  if (get8(pp, desc_end) == 0xFF) {
1827  st->codecpar->codec_tag = bytestream_get_le32(pp);
1828  if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
1829  mpegts_find_stream_type(st, st->codecpar->codec_tag, METADATA_types);
1830  }
1831  break;
1832  case 0x7f: /* DVB extension descriptor */
1833  ext_desc_tag = get8(pp, desc_end);
1834  if (ext_desc_tag < 0)
1835  return AVERROR_INVALIDDATA;
1836  if (st->codecpar->codec_id == AV_CODEC_ID_OPUS &&
1837  ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1838  if (!st->codecpar->extradata) {
1841  if (!st->codecpar->extradata)
1842  return AVERROR(ENOMEM);
1843 
1846 
1847  channel_config_code = get8(pp, desc_end);
1848  if (channel_config_code < 0)
1849  return AVERROR_INVALIDDATA;
1850  if (channel_config_code <= 0x8) {
1851  st->codecpar->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1852  st->codecpar->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
1853  st->codecpar->extradata[19] = opus_stream_cnt[channel_config_code];
1854  st->codecpar->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1855  memcpy(&st->codecpar->extradata[21], opus_channel_map[channels - 1], channels);
1856  } else {
1857  avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1858  }
1860  st->internal->need_context_update = 1;
1861  }
1862  }
1863  break;
1864  default:
1865  break;
1866  }
1867  *pp = desc_end;
1868  return 0;
1869 }
1870 
1871 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1872 {
1873  MpegTSContext *ts = filter->u.section_filter.opaque;
1874  MpegTSSectionFilter *tssf = &filter->u.section_filter;
1875  SectionHeader h1, *h = &h1;
1876  PESContext *pes;
1877  AVStream *st;
1878  const uint8_t *p, *p_end, *desc_list_end;
1879  int program_info_length, pcr_pid, pid, stream_type;
1880  int desc_list_len;
1881  uint32_t prog_reg_desc = 0; /* registration descriptor */
1882 
1883  int mp4_descr_count = 0;
1884  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1885  int i;
1886 
1887  av_log(ts->stream, AV_LOG_TRACE, "PMT: len %i\n", section_len);
1888  hex_dump_debug(ts->stream, section, section_len);
1889 
1890  p_end = section + section_len - 4;
1891  p = section;
1892  if (parse_section_header(h, &p, p_end) < 0)
1893  return;
1894  if (skip_identical(h, tssf))
1895  return;
1896 
1897  av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x sec_num=%d/%d version=%d tid=%d\n",
1898  h->id, h->sec_num, h->last_sec_num, h->version, h->tid);
1899 
1900  if (h->tid != PMT_TID)
1901  return;
1902  if (!ts->scan_all_pmts && ts->skip_changes)
1903  return;
1904 
1905  if (!ts->skip_clear)
1906  clear_program(ts, h->id);
1907 
1908  pcr_pid = get16(&p, p_end);
1909  if (pcr_pid < 0)
1910  return;
1911  pcr_pid &= 0x1fff;
1912  add_pid_to_pmt(ts, h->id, pcr_pid);
1913  set_pcr_pid(ts->stream, h->id, pcr_pid);
1914 
1915  av_log(ts->stream, AV_LOG_TRACE, "pcr_pid=0x%x\n", pcr_pid);
1916 
1917  program_info_length = get16(&p, p_end);
1918  if (program_info_length < 0)
1919  return;
1920  program_info_length &= 0xfff;
1921  while (program_info_length >= 2) {
1922  uint8_t tag, len;
1923  tag = get8(&p, p_end);
1924  len = get8(&p, p_end);
1925 
1926  av_log(ts->stream, AV_LOG_TRACE, "program tag: 0x%02x len=%d\n", tag, len);
1927 
1928  if (len > program_info_length - 2)
1929  // something else is broken, exit the program_descriptors_loop
1930  break;
1931  program_info_length -= len + 2;
1932  if (tag == 0x1d) { // IOD descriptor
1933  get8(&p, p_end); // scope
1934  get8(&p, p_end); // label
1935  len -= 2;
1936  mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1937  &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1938  } else if (tag == 0x05 && len >= 4) { // registration descriptor
1939  prog_reg_desc = bytestream_get_le32(&p);
1940  len -= 4;
1941  }
1942  p += len;
1943  }
1944  p += program_info_length;
1945  if (p >= p_end)
1946  goto out;
1947 
1948  // stop parsing after pmt, we found header
1949  if (!ts->stream->nb_streams)
1950  ts->stop_parse = 2;
1951 
1952  set_pmt_found(ts, h->id);
1953 
1954 
1955  for (;;) {
1956  st = 0;
1957  pes = NULL;
1958  stream_type = get8(&p, p_end);
1959  if (stream_type < 0)
1960  break;
1961  pid = get16(&p, p_end);
1962  if (pid < 0)
1963  goto out;
1964  pid &= 0x1fff;
1965  if (pid == ts->current_pid)
1966  goto out;
1967 
1968  /* now create stream */
1969  if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1970  pes = ts->pids[pid]->u.pes_filter.opaque;
1971  if (!pes->st) {
1972  pes->st = avformat_new_stream(pes->stream, NULL);
1973  if (!pes->st)
1974  goto out;
1975  pes->st->id = pes->pid;
1976  }
1977  st = pes->st;
1978  } else if (stream_type != 0x13) {
1979  if (ts->pids[pid])
1980  mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1981  pes = add_pes_stream(ts, pid, pcr_pid);
1982  if (pes) {
1983  st = avformat_new_stream(pes->stream, NULL);
1984  if (!st)
1985  goto out;
1986  st->id = pes->pid;
1987  }
1988  } else {
1989  int idx = ff_find_stream_index(ts->stream, pid);
1990  if (idx >= 0) {
1991  st = ts->stream->streams[idx];
1992  } else {
1993  st = avformat_new_stream(ts->stream, NULL);
1994  if (!st)
1995  goto out;
1996  st->id = pid;
1998  }
1999  }
2000 
2001  if (!st)
2002  goto out;
2003 
2004  if (pes && !pes->stream_type)
2005  mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
2006 
2007  add_pid_to_pmt(ts, h->id, pid);
2008 
2010 
2011  desc_list_len = get16(&p, p_end);
2012  if (desc_list_len < 0)
2013  goto out;
2014  desc_list_len &= 0xfff;
2015  desc_list_end = p + desc_list_len;
2016  if (desc_list_end > p_end)
2017  goto out;
2018  for (;;) {
2019  if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
2020  desc_list_end, mp4_descr,
2021  mp4_descr_count, pid, ts) < 0)
2022  break;
2023 
2024  if (pes && prog_reg_desc == AV_RL32("HDMV") &&
2025  stream_type == 0x83 && pes->sub_st) {
2027  pes->sub_st->index);
2028  pes->sub_st->codecpar->codec_tag = st->codecpar->codec_tag;
2029  }
2030  }
2031  p = desc_list_end;
2032  }
2033 
2034  if (!ts->pids[pcr_pid])
2035  mpegts_open_pcr_filter(ts, pcr_pid);
2036 
2037 out:
2038  for (i = 0; i < mp4_descr_count; i++)
2039  av_free(mp4_descr[i].dec_config_descr);
2040 }
2041 
2042 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2043 {
2044  MpegTSContext *ts = filter->u.section_filter.opaque;
2045  MpegTSSectionFilter *tssf = &filter->u.section_filter;
2046  SectionHeader h1, *h = &h1;
2047  const uint8_t *p, *p_end;
2048  int sid, pmt_pid;
2049  AVProgram *program;
2050 
2051  av_log(ts->stream, AV_LOG_TRACE, "PAT:\n");
2052  hex_dump_debug(ts->stream, section, section_len);
2053 
2054  p_end = section + section_len - 4;
2055  p = section;
2056  if (parse_section_header(h, &p, p_end) < 0)
2057  return;
2058  if (h->tid != PAT_TID)
2059  return;
2060  if (ts->skip_changes)
2061  return;
2062 
2063  if (skip_identical(h, tssf))
2064  return;
2065  ts->stream->ts_id = h->id;
2066 
2067  clear_programs(ts);
2068  for (;;) {
2069  sid = get16(&p, p_end);
2070  if (sid < 0)
2071  break;
2072  pmt_pid = get16(&p, p_end);
2073  if (pmt_pid < 0)
2074  break;
2075  pmt_pid &= 0x1fff;
2076 
2077  if (pmt_pid == ts->current_pid)
2078  break;
2079 
2080  av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
2081 
2082  if (sid == 0x0000) {
2083  /* NIT info */
2084  } else {
2085  MpegTSFilter *fil = ts->pids[pmt_pid];
2086  program = av_new_program(ts->stream, sid);
2087  if (program) {
2088  program->program_num = sid;
2089  program->pmt_pid = pmt_pid;
2090  }
2091  if (fil)
2092  if ( fil->type != MPEGTS_SECTION
2093  || fil->pid != pmt_pid
2094  || fil->u.section_filter.section_cb != pmt_cb)
2095  mpegts_close_filter(ts, ts->pids[pmt_pid]);
2096 
2097  if (!ts->pids[pmt_pid])
2098  mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2099  add_pat_entry(ts, sid);
2100  add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2101  add_pid_to_pmt(ts, sid, pmt_pid);
2102  }
2103  }
2104 
2105  if (sid < 0) {
2106  int i,j;
2107  for (j=0; j<ts->stream->nb_programs; j++) {
2108  for (i = 0; i < ts->nb_prg; i++)
2109  if (ts->prg[i].id == ts->stream->programs[j]->id)
2110  break;
2111  if (i==ts->nb_prg && !ts->skip_clear)
2112  clear_avprogram(ts, ts->stream->programs[j]->id);
2113  }
2114  }
2115 }
2116 
2117 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2118 {
2119  MpegTSContext *ts = filter->u.section_filter.opaque;
2120  MpegTSSectionFilter *tssf = &filter->u.section_filter;
2121  SectionHeader h1, *h = &h1;
2122  const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2123  int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2124  char *name, *provider_name;
2125 
2126  av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
2127  hex_dump_debug(ts->stream, section, section_len);
2128 
2129  p_end = section + section_len - 4;
2130  p = section;
2131  if (parse_section_header(h, &p, p_end) < 0)
2132  return;
2133  if (h->tid != SDT_TID)
2134  return;
2135  if (ts->skip_changes)
2136  return;
2137  if (skip_identical(h, tssf))
2138  return;
2139 
2140  onid = get16(&p, p_end);
2141  if (onid < 0)
2142  return;
2143  val = get8(&p, p_end);
2144  if (val < 0)
2145  return;
2146  for (;;) {
2147  sid = get16(&p, p_end);
2148  if (sid < 0)
2149  break;
2150  val = get8(&p, p_end);
2151  if (val < 0)
2152  break;
2153  desc_list_len = get16(&p, p_end);
2154  if (desc_list_len < 0)
2155  break;
2156  desc_list_len &= 0xfff;
2157  desc_list_end = p + desc_list_len;
2158  if (desc_list_end > p_end)
2159  break;
2160  for (;;) {
2161  desc_tag = get8(&p, desc_list_end);
2162  if (desc_tag < 0)
2163  break;
2164  desc_len = get8(&p, desc_list_end);
2165  desc_end = p + desc_len;
2166  if (desc_len < 0 || desc_end > desc_list_end)
2167  break;
2168 
2169  av_log(ts->stream, AV_LOG_TRACE, "tag: 0x%02x len=%d\n",
2170  desc_tag, desc_len);
2171 
2172  switch (desc_tag) {
2173  case 0x48:
2174  service_type = get8(&p, p_end);
2175  if (service_type < 0)
2176  break;
2177  provider_name = getstr8(&p, p_end);
2178  if (!provider_name)
2179  break;
2180  name = getstr8(&p, p_end);
2181  if (name) {
2182  AVProgram *program = av_new_program(ts->stream, sid);
2183  if (program) {
2184  av_dict_set(&program->metadata, "service_name", name, 0);
2185  av_dict_set(&program->metadata, "service_provider",
2186  provider_name, 0);
2187  }
2188  }
2189  av_free(name);
2190  av_free(provider_name);
2191  break;
2192  default:
2193  break;
2194  }
2195  p = desc_end;
2196  }
2197  p = desc_list_end;
2198  }
2199 }
2200 
2201 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2202  const uint8_t *packet);
2203 
2204 /* handle one TS packet */
2205 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2206 {
2207  MpegTSFilter *tss;
2208  int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2209  has_adaptation, has_payload;
2210  const uint8_t *p, *p_end;
2211  int64_t pos;
2212 
2213  pid = AV_RB16(packet + 1) & 0x1fff;
2214  if (pid && discard_pid(ts, pid))
2215  return 0;
2216  is_start = packet[1] & 0x40;
2217  tss = ts->pids[pid];
2218  if (ts->auto_guess && !tss && is_start) {
2219  add_pes_stream(ts, pid, -1);
2220  tss = ts->pids[pid];
2221  }
2222  if (!tss)
2223  return 0;
2224  ts->current_pid = pid;
2225 
2226  afc = (packet[3] >> 4) & 3;
2227  if (afc == 0) /* reserved value */
2228  return 0;
2229  has_adaptation = afc & 2;
2230  has_payload = afc & 1;
2231  is_discontinuity = has_adaptation &&
2232  packet[4] != 0 && /* with length > 0 */
2233  (packet[5] & 0x80); /* and discontinuity indicated */
2234 
2235  /* continuity check (currently not used) */
2236  cc = (packet[3] & 0xf);
2237  expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2238  cc_ok = pid == 0x1FFF || // null packet PID
2239  is_discontinuity ||
2240  tss->last_cc < 0 ||
2241  expected_cc == cc;
2242 
2243  tss->last_cc = cc;
2244  if (!cc_ok) {
2245  av_log(ts->stream, AV_LOG_DEBUG,
2246  "Continuity check failed for pid %d expected %d got %d\n",
2247  pid, expected_cc, cc);
2248  if (tss->type == MPEGTS_PES) {
2249  PESContext *pc = tss->u.pes_filter.opaque;
2250  pc->flags |= AV_PKT_FLAG_CORRUPT;
2251  }
2252  }
2253 
2254  p = packet + 4;
2255  if (has_adaptation) {
2256  int64_t pcr_h;
2257  int pcr_l;
2258  if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2259  tss->last_pcr = pcr_h * 300 + pcr_l;
2260  /* skip adaptation field */
2261  p += p[0] + 1;
2262  }
2263  /* if past the end of packet, ignore */
2264  p_end = packet + TS_PACKET_SIZE;
2265  if (p >= p_end || !has_payload)
2266  return 0;
2267 
2268  pos = avio_tell(ts->stream->pb);
2269  if (pos >= 0) {
2270  av_assert0(pos >= TS_PACKET_SIZE);
2271  ts->pos47_full = pos - TS_PACKET_SIZE;
2272  }
2273 
2274  if (tss->type == MPEGTS_SECTION) {
2275  if (is_start) {
2276  /* pointer field present */
2277  len = *p++;
2278  if (len > p_end - p)
2279  return 0;
2280  if (len && cc_ok) {
2281  /* write remaining section bytes */
2282  write_section_data(ts, tss,
2283  p, len, 0);
2284  /* check whether filter has been closed */
2285  if (!ts->pids[pid])
2286  return 0;
2287  }
2288  p += len;
2289  if (p < p_end) {
2290  write_section_data(ts, tss,
2291  p, p_end - p, 1);
2292  }
2293  } else {
2294  if (cc_ok) {
2295  write_section_data(ts, tss,
2296  p, p_end - p, 0);
2297  }
2298  }
2299 
2300  // stop find_stream_info from waiting for more streams
2301  // when all programs have received a PMT
2302  if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2303  int i;
2304  for (i = 0; i < ts->nb_prg; i++) {
2305  if (!ts->prg[i].pmt_found)
2306  break;
2307  }
2308  if (i == ts->nb_prg && ts->nb_prg > 0) {
2309  int types = 0;
2310  for (i = 0; i < ts->stream->nb_streams; i++) {
2311  AVStream *st = ts->stream->streams[i];
2312  types |= 1<<st->codecpar->codec_type;
2313  }
2314  if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2315  av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2317  }
2318  }
2319  }
2320 
2321  } else {
2322  int ret;
2323  // Note: The position here points actually behind the current packet.
2324  if (tss->type == MPEGTS_PES) {
2325  if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2326  pos - ts->raw_packet_size)) < 0)
2327  return ret;
2328  }
2329  }
2330 
2331  return 0;
2332 }
2333 
2334 static void reanalyze(MpegTSContext *ts) {
2335  AVIOContext *pb = ts->stream->pb;
2336  int64_t pos = avio_tell(pb);
2337  if (pos < 0)
2338  return;
2339  pos -= ts->pos47_full;
2340  if (pos == TS_PACKET_SIZE) {
2341  ts->size_stat[0] ++;
2342  } else if (pos == TS_DVHS_PACKET_SIZE) {
2343  ts->size_stat[1] ++;
2344  } else if (pos == TS_FEC_PACKET_SIZE) {
2345  ts->size_stat[2] ++;
2346  }
2347 
2348  ts->size_stat_count ++;
2350  int newsize = 0;
2351  if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2352  newsize = TS_PACKET_SIZE;
2353  } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2354  newsize = TS_DVHS_PACKET_SIZE;
2355  } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2356  newsize = TS_FEC_PACKET_SIZE;
2357  }
2358  if (newsize && newsize != ts->raw_packet_size) {
2359  av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2360  ts->raw_packet_size = newsize;
2361  }
2362  ts->size_stat_count = 0;
2363  memset(ts->size_stat, 0, sizeof(ts->size_stat));
2364  }
2365 }
2366 
2367 /* XXX: try to find a better synchro over several packets (use
2368  * get_packet_size() ?) */
2369 static int mpegts_resync(AVFormatContext *s, int seekback, const uint8_t *current_packet)
2370 {
2371  MpegTSContext *ts = s->priv_data;
2372  AVIOContext *pb = s->pb;
2373  int c, i;
2374  uint64_t pos = avio_tell(pb);
2375 
2376  avio_seek(pb, -FFMIN(seekback, pos), SEEK_CUR);
2377 
2378  //Special case for files like 01c56b0dc1.ts
2379  if (current_packet[0] == 0x80 && current_packet[12] == 0x47) {
2380  avio_seek(pb, 12, SEEK_CUR);
2381  return 0;
2382  }
2383 
2384  for (i = 0; i < ts->resync_size; i++) {
2385  c = avio_r8(pb);
2386  if (avio_feof(pb))
2387  return AVERROR_EOF;
2388  if (c == 0x47) {
2389  avio_seek(pb, -1, SEEK_CUR);
2390  reanalyze(s->priv_data);
2391  return 0;
2392  }
2393  }
2394  av_log(s, AV_LOG_ERROR,
2395  "max resync size reached, could not find sync byte\n");
2396  /* no sync found */
2397  return AVERROR_INVALIDDATA;
2398 }
2399 
2400 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2401 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2402  const uint8_t **data)
2403 {
2404  AVIOContext *pb = s->pb;
2405  int len;
2406 
2407  for (;;) {
2408  len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2409  if (len != TS_PACKET_SIZE)
2410  return len < 0 ? len : AVERROR_EOF;
2411  /* check packet sync byte */
2412  if ((*data)[0] != 0x47) {
2413  /* find a new packet start */
2414 
2415  if (mpegts_resync(s, raw_packet_size, *data) < 0)
2416  return AVERROR(EAGAIN);
2417  else
2418  continue;
2419  } else {
2420  break;
2421  }
2422  }
2423  return 0;
2424 }
2425 
2426 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2427 {
2428  AVIOContext *pb = s->pb;
2429  int skip = raw_packet_size - TS_PACKET_SIZE;
2430  if (skip > 0)
2431  avio_skip(pb, skip);
2432 }
2433 
2434 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2435 {
2436  AVFormatContext *s = ts->stream;
2438  const uint8_t *data;
2439  int64_t packet_num;
2440  int ret = 0;
2441 
2442  if (avio_tell(s->pb) != ts->last_pos) {
2443  int i;
2444  av_log(ts->stream, AV_LOG_TRACE, "Skipping after seek\n");
2445  /* seek detected, flush pes buffer */
2446  for (i = 0; i < NB_PID_MAX; i++) {
2447  if (ts->pids[i]) {
2448  if (ts->pids[i]->type == MPEGTS_PES) {
2449  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2450  av_buffer_unref(&pes->buffer);
2451  pes->data_index = 0;
2452  pes->state = MPEGTS_SKIP; /* skip until pes header */
2453  } else if (ts->pids[i]->type == MPEGTS_SECTION) {
2454  ts->pids[i]->u.section_filter.last_ver = -1;
2455  }
2456  ts->pids[i]->last_cc = -1;
2457  ts->pids[i]->last_pcr = -1;
2458  }
2459  }
2460  }
2461 
2462  ts->stop_parse = 0;
2463  packet_num = 0;
2464  memset(packet + TS_PACKET_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
2465  for (;;) {
2466  packet_num++;
2467  if (nb_packets != 0 && packet_num >= nb_packets ||
2468  ts->stop_parse > 1) {
2469  ret = AVERROR(EAGAIN);
2470  break;
2471  }
2472  if (ts->stop_parse > 0)
2473  break;
2474 
2475  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2476  if (ret != 0)
2477  break;
2478  ret = handle_packet(ts, data);
2480  if (ret != 0)
2481  break;
2482  }
2483  ts->last_pos = avio_tell(s->pb);
2484  return ret;
2485 }
2486 
2488 {
2489  const int size = p->buf_size;
2490  int maxscore = 0;
2491  int sumscore = 0;
2492  int i;
2493  int check_count = size / TS_FEC_PACKET_SIZE;
2494 #define CHECK_COUNT 10
2495 #define CHECK_BLOCK 100
2496 
2497  if (!check_count)
2498  return 0;
2499 
2500  for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2501  int left = FFMIN(check_count - i, CHECK_BLOCK);
2502  int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , 1);
2503  int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, 1);
2504  int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , 1);
2505  score = FFMAX3(score, dvhs_score, fec_score);
2506  sumscore += score;
2507  maxscore = FFMAX(maxscore, score);
2508  }
2509 
2510  sumscore = sumscore * CHECK_COUNT / check_count;
2511  maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2512 
2513  ff_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2514 
2515  if (check_count > CHECK_COUNT && sumscore > 6) {
2516  return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2517  } else if (check_count >= CHECK_COUNT && sumscore > 6) {
2518  return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2519  } else if (check_count >= CHECK_COUNT && maxscore > 6) {
2520  return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2521  } else if (sumscore > 6) {
2522  return 2;
2523  } else {
2524  return 0;
2525  }
2526 }
2527 
2528 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2529  * (-1) if not available */
2530 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2531 {
2532  int afc, len, flags;
2533  const uint8_t *p;
2534  unsigned int v;
2535 
2536  afc = (packet[3] >> 4) & 3;
2537  if (afc <= 1)
2538  return AVERROR_INVALIDDATA;
2539  p = packet + 4;
2540  len = p[0];
2541  p++;
2542  if (len == 0)
2543  return AVERROR_INVALIDDATA;
2544  flags = *p++;
2545  len--;
2546  if (!(flags & 0x10))
2547  return AVERROR_INVALIDDATA;
2548  if (len < 6)
2549  return AVERROR_INVALIDDATA;
2550  v = AV_RB32(p);
2551  *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2552  *ppcr_low = ((p[4] & 1) << 8) | p[5];
2553  return 0;
2554 }
2555 
2556 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2557 
2558  /* NOTE: We attempt to seek on non-seekable files as well, as the
2559  * probe buffer usually is big enough. Only warn if the seek failed
2560  * on files where the seek should work. */
2561  if (avio_seek(pb, pos, SEEK_SET) < 0)
2562  av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2563 }
2564 
2566 {
2567  MpegTSContext *ts = s->priv_data;
2568  AVIOContext *pb = s->pb;
2569  uint8_t buf[8 * 1024] = {0};
2570  int len;
2571  int64_t pos, probesize = s->probesize;
2572 
2573  if (ffio_ensure_seekback(pb, probesize) < 0)
2574  av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
2575 
2576  /* read the first 8192 bytes to get packet size */
2577  pos = avio_tell(pb);
2578  len = avio_read(pb, buf, sizeof(buf));
2579  ts->raw_packet_size = get_packet_size(buf, len);
2580  if (ts->raw_packet_size <= 0) {
2581  av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2583  }
2584  ts->stream = s;
2585  ts->auto_guess = 0;
2586 
2587  if (s->iformat == &ff_mpegts_demuxer) {
2588  /* normal demux */
2589 
2590  /* first do a scan to get all the services */
2591  seek_back(s, pb, pos);
2592 
2594 
2596 
2597  handle_packets(ts, probesize / ts->raw_packet_size);
2598  /* if could not find service, enable auto_guess */
2599 
2600  ts->auto_guess = 1;
2601 
2602  av_log(ts->stream, AV_LOG_TRACE, "tuning done\n");
2603 
2605  } else {
2606  AVStream *st;
2607  int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2608  int64_t pcrs[2], pcr_h;
2609  int packet_count[2];
2610  uint8_t packet[TS_PACKET_SIZE];
2611  const uint8_t *data;
2612 
2613  /* only read packets */
2614 
2615  st = avformat_new_stream(s, NULL);
2616  if (!st)
2617  return AVERROR(ENOMEM);
2618  avpriv_set_pts_info(st, 60, 1, 27000000);
2621 
2622  /* we iterate until we find two PCRs to estimate the bitrate */
2623  pcr_pid = -1;
2624  nb_pcrs = 0;
2625  nb_packets = 0;
2626  for (;;) {
2627  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2628  if (ret < 0)
2629  return ret;
2630  pid = AV_RB16(data + 1) & 0x1fff;
2631  if ((pcr_pid == -1 || pcr_pid == pid) &&
2632  parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2634  pcr_pid = pid;
2635  packet_count[nb_pcrs] = nb_packets;
2636  pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2637  nb_pcrs++;
2638  if (nb_pcrs >= 2)
2639  break;
2640  } else {
2642  }
2643  nb_packets++;
2644  }
2645 
2646  /* NOTE1: the bitrate is computed without the FEC */
2647  /* NOTE2: it is only the bitrate of the start of the stream */
2648  ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2649  ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2650  s->bit_rate = TS_PACKET_SIZE * 8 * 27000000LL / ts->pcr_incr;
2651  st->codecpar->bit_rate = s->bit_rate;
2652  st->start_time = ts->cur_pcr;
2653  av_log(ts->stream, AV_LOG_TRACE, "start=%0.3f pcr=%0.3f incr=%d\n",
2654  st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2655  }
2656 
2657  seek_back(s, pb, pos);
2658  return 0;
2659 }
2660 
2661 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2662 
2664 {
2665  MpegTSContext *ts = s->priv_data;
2666  int ret, i;
2667  int64_t pcr_h, next_pcr_h, pos;
2668  int pcr_l, next_pcr_l;
2669  uint8_t pcr_buf[12];
2670  const uint8_t *data;
2671 
2672  if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2673  return AVERROR(ENOMEM);
2674  ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2675  pkt->pos = avio_tell(s->pb);
2676  if (ret < 0) {
2677  av_packet_unref(pkt);
2678  return ret;
2679  }
2680  if (data != pkt->data)
2681  memcpy(pkt->data, data, ts->raw_packet_size);
2683  if (ts->mpeg2ts_compute_pcr) {
2684  /* compute exact PCR for each packet */
2685  if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2686  /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2687  pos = avio_tell(s->pb);
2688  for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2689  avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2690  avio_read(s->pb, pcr_buf, 12);
2691  if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2692  /* XXX: not precise enough */
2693  ts->pcr_incr =
2694  ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2695  (i + 1);
2696  break;
2697  }
2698  }
2699  avio_seek(s->pb, pos, SEEK_SET);
2700  /* no next PCR found: we use previous increment */
2701  ts->cur_pcr = pcr_h * 300 + pcr_l;
2702  }
2703  pkt->pts = ts->cur_pcr;
2704  pkt->duration = ts->pcr_incr;
2705  ts->cur_pcr += ts->pcr_incr;
2706  }
2707  pkt->stream_index = 0;
2708  return 0;
2709 }
2710 
2712 {
2713  MpegTSContext *ts = s->priv_data;
2714  int ret, i;
2715 
2716  pkt->size = -1;
2717  ts->pkt = pkt;
2718  ret = handle_packets(ts, 0);
2719  if (ret < 0) {
2720  av_packet_unref(ts->pkt);
2721  /* flush pes data left */
2722  for (i = 0; i < NB_PID_MAX; i++)
2723  if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2724  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2725  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2726  ret = new_pes_packet(pes, pkt);
2727  if (ret < 0)
2728  return ret;
2729  pes->state = MPEGTS_SKIP;
2730  ret = 0;
2731  break;
2732  }
2733  }
2734  }
2735 
2736  if (!ret && pkt->size < 0)
2737  ret = AVERROR_INVALIDDATA;
2738  return ret;
2739 }
2740 
2741 static void mpegts_free(MpegTSContext *ts)
2742 {
2743  int i;
2744 
2745  clear_programs(ts);
2746 
2747  for (i = 0; i < NB_PID_MAX; i++)
2748  if (ts->pids[i])
2749  mpegts_close_filter(ts, ts->pids[i]);
2750 }
2751 
2753 {
2754  MpegTSContext *ts = s->priv_data;
2755  mpegts_free(ts);
2756  return 0;
2757 }
2758 
2759 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2760  int64_t *ppos, int64_t pos_limit)
2761 {
2762  MpegTSContext *ts = s->priv_data;
2763  int64_t pos, timestamp;
2765  int pcr_l, pcr_pid =
2766  ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2767  int pos47 = ts->pos47_full % ts->raw_packet_size;
2768  pos =
2769  ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2770  ts->raw_packet_size + pos47;
2771  while(pos < pos_limit) {
2772  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2773  return AV_NOPTS_VALUE;
2774  if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2775  return AV_NOPTS_VALUE;
2776  if (buf[0] != 0x47) {
2777  if (mpegts_resync(s, TS_PACKET_SIZE, buf) < 0)
2778  return AV_NOPTS_VALUE;
2779  pos = avio_tell(s->pb);
2780  continue;
2781  }
2782  if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2783  parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2784  *ppos = pos;
2785  return timestamp;
2786  }
2787  pos += ts->raw_packet_size;
2788  }
2789 
2790  return AV_NOPTS_VALUE;
2791 }
2792 
2793 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2794  int64_t *ppos, int64_t pos_limit)
2795 {
2796  MpegTSContext *ts = s->priv_data;
2797  int64_t pos;
2798  int pos47 = ts->pos47_full % ts->raw_packet_size;
2799  pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2801  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2802  return AV_NOPTS_VALUE;
2803  while(pos < pos_limit) {
2804  int ret;
2805  AVPacket pkt;
2806  av_init_packet(&pkt);
2807  ret = av_read_frame(s, &pkt);
2808  if (ret < 0)
2809  return AV_NOPTS_VALUE;
2810  if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2811  ff_reduce_index(s, pkt.stream_index);
2812  av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2813  if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2814  int64_t dts = pkt.dts;
2815  *ppos = pkt.pos;
2816  av_packet_unref(&pkt);
2817  return dts;
2818  }
2819  }
2820  pos = pkt.pos;
2821  av_packet_unref(&pkt);
2822  }
2823 
2824  return AV_NOPTS_VALUE;
2825 }
2826 
2827 /**************************************************************/
2828 /* parsing functions - called from other demuxers such as RTP */
2829 
2831 {
2832  MpegTSContext *ts;
2833 
2834  ts = av_mallocz(sizeof(MpegTSContext));
2835  if (!ts)
2836  return NULL;
2837  /* no stream case, currently used by RTP */
2839  ts->stream = s;
2840  ts->auto_guess = 1;
2843 
2844  return ts;
2845 }
2846 
2847 /* return the consumed length if a packet was output, or -1 if no
2848  * packet is output */
2850  const uint8_t *buf, int len)
2851 {
2852  int len1;
2853 
2854  len1 = len;
2855  ts->pkt = pkt;
2856  for (;;) {
2857  ts->stop_parse = 0;
2858  if (len < TS_PACKET_SIZE)
2859  return AVERROR_INVALIDDATA;
2860  if (buf[0] != 0x47) {
2861  buf++;
2862  len--;
2863  } else {
2864  handle_packet(ts, buf);
2865  buf += TS_PACKET_SIZE;
2866  len -= TS_PACKET_SIZE;
2867  if (ts->stop_parse == 1)
2868  break;
2869  }
2870  }
2871  return len1 - len;
2872 }
2873 
2875 {
2876  mpegts_free(ts);
2877  av_free(ts);
2878 }
2879 
2880 AVInputFormat ff_mpegts_demuxer = {
2881  .name = "mpegts",
2882  .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2883  .priv_data_size = sizeof(MpegTSContext),
2888  .read_timestamp = mpegts_get_dts,
2890  .priv_class = &mpegts_class,
2891 };
2892 
2894  .name = "mpegtsraw",
2895  .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2896  .priv_data_size = sizeof(MpegTSContext),
2900  .read_timestamp = mpegts_get_dts,
2902  .priv_class = &mpegtsraw_class,
2903 };
static void mpegts_free(MpegTSContext *ts)
Definition: mpegts.c:2741
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:1467
uint8_t last_sec_num
Definition: mpegts.c:591
#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:771
int64_t last_pcr
Definition: mpegts.c:93
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:147
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:251
int total_size
Definition: mpegts.c:235
void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id)
Definition: isom.c:455
static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
Definition: mpegts.c:2426
AVOption.
Definition: opt.h:245
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int64_t cur_pcr
used to estimate the exact PCR
Definition: mpegts.c:133
#define AV_OPT_FLAG_EXPORT
The option is intended for exporting values to the caller.
Definition: opt.h:286
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:1913
#define MAX_PACKET_READAHEAD
Definition: mpegts.c:2661
enum AVMediaType codec_type
Definition: mpegts.c:686
int64_t dts
Definition: mpegts.c:239
static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1354
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:247
#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:2205
#define LIBAVUTIL_VERSION_INT
Definition: version.h:70
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1610
static void clear_program(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:274
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4504
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:204
static int mpegts_probe(AVProbeData *p)
Definition: mpegts.c:2487
#define MP4ODescrTag
Definition: isom.h:249
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:1057
MpegTSContext * avpriv_mpegts_parse_open(AVFormatContext *s)
Definition: mpegts.c:2830
static int analyze(const uint8_t *buf, int size, int packet_size, int probe)
Definition: mpegts.c:534
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3953
int64_t pts_wrap_reference
Internal data to check for wrapping of the time stamp.
Definition: avformat.h:1162
int index
stream index in AVFormatContext
Definition: avformat.h:879
int size
Definition: avcodec.h:1591
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:230
uint8_t version
Definition: mpegts.c:589
int64_t bit_rate
Total stream bitrate in bit/s, 0 if not available.
Definition: avformat.h:1429
int size_stat_count
Definition: mpegts.c:119
#define AV_DISPOSITION_HEARING_IMPAIRED
stream for hearing impaired audiences
Definition: avformat.h:844
AVInputFormat ff_mpegts_demuxer
Definition: mpegts.c:2880
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
Definition: mpegts.c:2117
void * priv_data
Definition: avformat.h:893
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:304
#define AV_DISPOSITION_CLEAN_EFFECTS
stream without voice
Definition: avformat.h:846
#define M4OD_TID
Definition: mpegts.h:42
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
static int parse_section_header(SectionHeader *h, const uint8_t **pp, const uint8_t *p_end)
Definition: mpegts.c:655
discard all
Definition: avcodec.h:786
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:2711
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:742
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1376
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
int pcr_pid
if -1 then all packets containing PCR are considered
Definition: mpegts.c:225
SLConfigDescr sl
Definition: mpegts.h:94
static int mpegts_resync(AVFormatContext *s, int seekback, const uint8_t *current_packet)
Definition: mpegts.c:2369
int packet_seq_num_len
Definition: mpegts.h:87
int es_id
Definition: mpegts.h:91
int inst_bitrate_len
Definition: mpegts.h:84
unsigned int nb_prg
structure to keep track of Program->pids mapping
Definition: mpegts.c:155
#define AVFMT_SHOW_IDS
Show format stream IDs numbers.
Definition: avformat.h:480
int last_cc
Definition: mpegts.c:92
Format I/O context.
Definition: avformat.h:1327
static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size, const uint8_t **data)
Definition: mpegts.c:2401
unsigned int nb_stream_indexes
Definition: avformat.h:1259
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:1792
#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:1841
#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:922
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:2565
AVFormatContext * s
Definition: mpegts.c:1289
uint8_t bits
Definition: crc.c:296
uint8_t
int stream_identifier
Stream Identifier This is the MPEG-TS stream identifier +1 0 means unknown.
Definition: avformat.h:1099
#define av_malloc(s)
Opaque data information usually continuous.
Definition: avutil.h:197
static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:248
enum MpegTSState state
Definition: mpegts.c:231
static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
Definition: mpegts.c:2793
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1280
AVOptions.
int size_stat[3]
Definition: mpegts.c:118
int au_seq_num_len
Definition: mpegts.h:86
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:757
int stop_parse
stop parsing loop
Definition: mpegts.c:138
static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1368
static int discard_pid(MpegTSContext *ts, unsigned int pid)
discard_pid() decides if the pid is to be discarded according to caller's programs selection ...
Definition: mpegts.c:352
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1608
static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:292
static int mpegts_push_data(MpegTSFilter *filter, const uint8_t *buf, int buf_size, int is_start, int64_t pos)
Definition: mpegts.c:994
int id
Format-specific stream ID.
Definition: avformat.h:885
enum AVStreamParseType need_parsing
Definition: avformat.h:1065
int use_au_start
Definition: mpegts.h:74
static const AVOption raw_options[]
Definition: mpegts.c:189
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4137
int pmt_pid
Definition: avformat.h:1263
static const uint8_t opus_channel_map[8][8]
Definition: mpegts.c:1601
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, uint8_t clip)
Definition: cfhd.c:80
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1395
#define TS_PACKET_SIZE
Definition: mpegts.h:29
Public header for CRC hash function implementation.
Mp4Descr * descr
Definition: mpegts.c:1291
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:661
static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
Definition: mpegts.c:1321
uint8_t * data
Definition: avcodec.h:1590
AVProgram * av_new_program(AVFormatContext *s, int id)
Definition: utils.c:4233
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
MpegTSState
Definition: mpegts.c:210
uint32_t tag
Definition: movenc.c:1376
#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:511
static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos)
Definition: mpegts.c:2556
enum AVDiscard discard
selects which program to discard and which to feed to the caller
Definition: avformat.h:1257
static int probe(AVProbeData *p)
Definition: act.c:36
static PESContext * add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
Definition: mpegts.c:1263
unsigned int * stream_index
Definition: avformat.h:1258
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:604
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3982
static MpegTSFilter * mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid, PESCallback *pes_cb, void *opaque)
Definition: mpegts.c:492
AVInputFormat ff_mpegtsraw_demuxer
Definition: mpegts.c:2893
static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf, unsigned size, Mp4Descr *descr, int max_descr_count)
Definition: mpegts.c:1299
MPEGTS stream ID, this is required to pass the stream ID information from the demuxer to the correspo...
Definition: avcodec.h:1521
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
#define AVINDEX_KEYFRAME
Definition: avformat.h:825
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:568
static uint64_t get_bits64(GetBitContext *s, int n)
Read 0-64 bits.
Definition: get_bits.h:352
enum AVCodecID codec_id
Definition: mpegts.c:687
#define AVPROBE_SCORE_STREAM_RETRY
Definition: avformat.h:469
AVBufferRef * buffer
Definition: mpegts.c:242
AVProgram * av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s)
Find the programs which belong to a given stream.
Definition: utils.c:3861
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:480
static void reanalyze(MpegTSContext *ts)
Definition: mpegts.c:2334
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:191
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int predefined_SLConfigDescriptor_seen
Definition: mpegts.c:1296
static const StreamType HDMV_types[]
Definition: mpegts.c:713
#define AVFMT_TS_DISCONT
Format allows timestamp discontinuities.
Definition: avformat.h:488
static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:259
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
static int mpegts_read_close(AVFormatContext *s)
Definition: mpegts.c:2752
unsigned int check_crc
Definition: mpegts.c:83
static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpegts.c:2663
union MpegTSFilter::@198 u
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
int avcodec_is_open(AVCodecContext *s)
Definition: utils.c:3923
const char * r
Definition: vf_curves.c:111
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
unsigned int nb_programs
Definition: avformat.h:1480
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:517
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3949
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1573
int pes_header_size
Definition: mpegts.c:236
simple assert() macros that are a bit more flexible than ISO C assert().
enum AVMediaType avcodec_get_type(enum AVCodecID codec_id)
Get the type of the given codec.
Definition: codec_desc.c:3000
#define TS_FEC_PACKET_SIZE
Definition: mpegts.h:27
New fields can be added to the end with minor version bumps.
Definition: avformat.h:1254
#define FFMAX(a, b)
Definition: common.h:94
static int64_t ff_parse_pes_pts(const uint8_t *buf)
Parse MPEG-PES five-byte timestamp.
Definition: mpeg.h:67
int timestamp_len
Definition: mpegts.h:81
static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1389
int flags
copied to the AVPacket flags
Definition: mpegts.c:234
int program_num
Definition: avformat.h:1262
#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:1596
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3971
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:595
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:215
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:464
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
common internal API header
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1383
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:4588
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:243
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:3122
int64_t ts_packet_pos
position of first TS packet of this PES packet
Definition: mpegts.c:240
SectionCallback * section_cb
Definition: mpegts.c:85
static const StreamType REGD_types[]
Definition: mpegts.c:735
void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx)
int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos)
Definition: mpegts.c:64
#define FFMIN(a, b)
Definition: common.h:96
static const StreamType MISC_types[]
Definition: mpegts.c:729
uint16_t id
Definition: mpegts.c:588
static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
Definition: mpegts.c:333
static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size, Mp4Descr *descr, int *descr_count, int max_descr_count)
Definition: mpegts.c:1514
#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:250
AVFormatContext * stream
Definition: mpegts.c:114
int skip_changes
Definition: mpegts.c:144
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition: crc.c:357
static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
Definition: mpegts.c:324
int ocr_len
Definition: mpegts.h:82
static int mpegts_set_stream_info(AVStream *st, PESContext *pes, uint32_t stream_type, uint32_t prog_reg_desc)
Definition: mpegts.c:784
AVDictionary * metadata
Definition: avformat.h:947
static const uint8_t opus_stream_cnt[9]
Definition: mpegts.c:1597
static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len, int target_tag)
Definition: mpegts.c:1445
#define CHECK_COUNT
static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1403
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:1593
#define CHECK_BLOCK
static uint64_t get_ts64(GetBitContext *gb, int bits)
Definition: mpegts.c:915
uint8_t sec_num
Definition: mpegts.c:590
int extended_stream_id
Definition: mpegts.c:237
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:196
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:690
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:514
int ts_id
Transport stream id.
Definition: avformat.h:1641
#define AV_DISPOSITION_VISUAL_IMPAIRED
stream for visual impaired audiences
Definition: avformat.h:845
Stream structure.
Definition: avformat.h:878
FAKE codec to indicate a MPEG-4 Systems stream (only used by libavformat)
Definition: avcodec.h:648
static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
Definition: mpegts.c:2759
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
#define TS_MAX_PACKET_SIZE
Definition: mpegts.h:30
uint8_t * dec_config_descr
Definition: mpegts.h:93
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1219
unsigned int id
Definition: mpegts.c:103
#define MP4DecConfigDescrTag
Definition: isom.h:252
uint8_t stream_id
Definition: mpegts.c:238
static MpegTSFilter * mpegts_open_filter(MpegTSContext *ts, unsigned int pid, enum MpegTSFilterType type)
Definition: mpegts.c:444
AVBufferRef * av_buffer_alloc(int size)
Allocate an AVBuffer of the given size using av_malloc().
Definition: buffer.c:66
#define hex_dump_debug(class, buf, size)
Definition: internal.h:41
AVIOContext * pb
I/O context.
Definition: avformat.h:1369
static const StreamType METADATA_types[]
Definition: mpegts.c:751
int use_au_end
Definition: mpegts.h:75
static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1331
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:563
static int new_pes_packet(PESContext *pes, AVPacket *pkt)
Definition: mpegts.c:875
int resync_size
Definition: mpegts.c:149
uint8_t * data
The data buffer.
Definition: buffer.h:89
static int get_packet_size(const uint8_t *buf, int size)
Definition: mpegts.c:563
#define STREAM_TYPE_PRIVATE_DATA
Definition: mpeg.h:54
void * buf
Definition: avisynth_c.h:690
#define MAX_PES_HEADER_SIZE
Definition: mpegts.c:221
static int get8(const uint8_t **pp, const uint8_t *p_end)
Definition: mpegts.c:605
GLint GLenum type
Definition: opengl_enc.c:105
#define MAX_LEVEL
Definition: mpegts.c:1287
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
#define MAX_PIDS_PER_PROGRAM
Definition: mpegts.c:101
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
Definition: mpegts.c:2530
int use_timestamps
Definition: mpegts.h:78
Describe the class of an AVClass context structure.
Definition: log.h:67
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:292
static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
Definition: mpegts.c:1871
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:276
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:406
int need_context_update
Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar) ...
Definition: internal.h:164
int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt, const uint8_t *buf, int len)
Definition: mpegts.c:2849
AVMediaType
Definition: avutil.h:193
refcounted data buffer API
static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
Definition: mpegts.c:513
static const StreamType DESC_types[]
Definition: mpegts.c:758
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
int use_idle
Definition: mpegts.h:79
SLConfigDescr sl
Definition: mpegts.c:243
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1644
int dec_config_descr_len
Definition: mpegts.h:92
uint8_t * section_buf
Definition: mpegts.c:82
uint8_t tid
Definition: mpegts.c:587
AVDictionary * metadata
Definition: avformat.h:1260
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#define MPEGTS_OPTIONS
Definition: mpegts.c:164
static int flags
Definition: cpu.c:47
unsigned int end_of_section_reached
Definition: mpegts.c:84
static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1, const uint8_t *buf, int buf_size, int is_start)
Assemble PES packets out of TS packets, and then call the "section_cb" function when they are complet...
Definition: mpegts.c:390
int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type, const uint8_t **pp, const uint8_t *desc_list_end, Mp4Descr *mp4_descr, int mp4_descr_count, int pid, MpegTSContext *ts)
Parse an MPEG-2 descriptor.
Definition: mpegts.c:1612
static void clear_programs(MpegTSContext *ts)
Definition: mpegts.c:286
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
Definition: aviobuf.c:930
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:343
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
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:808
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:2042
int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag)
Definition: isom.c:446
static const AVClass mpegts_class
Definition: mpegts.c:182
int use_rand_acc_pt
Definition: mpegts.h:76
int data_index
Definition: mpegts.c:233
if(ret< 0)
Definition: vf_mcdeint.c:282
int pts_wrap_behavior
Options for behavior, when a wrap is detected.
Definition: avformat.h:1174
int ffio_init_context(AVIOContext *s, unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
Definition: aviobuf.c:81
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:925
static double c[64]
unsigned crc
Definition: mpegts.c:80
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:936
uint8_t header[MAX_PES_HEADER_SIZE]
Definition: mpegts.c:241
static void reset_pes_packet_state(PESContext *pes)
Definition: mpegts.c:866
#define MAX_PES_PAYLOAD
Definition: mpegts.c:45
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
int pmt_found
have we found pmt for this program
Definition: mpegts.c:108
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: avcodec.h:1623
struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1339
PESCallback * pes_cb
Definition: mpegts.c:68
static int skip_identical(const SectionHeader *h, MpegTSSectionFilter *tssf)
Definition: mpegts.c:594
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:733
static MpegTSFilter * mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid, SectionCallback *section_cb, void *opaque, int check_crc)
Definition: mpegts.c:467
FAKE codec to indicate a raw MPEG-2 TS stream (only used by libavformat)
Definition: avcodec.h:646
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:618
#define av_free(p)
Mp4Descr * active_descr
Definition: mpegts.c:1292
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:1355
int pcr_pid
Definition: avformat.h:1264
int64_t last_pos
to detect seek
Definition: mpegts.c:142
int timestamp_res
Definition: mpegts.h:80
#define AV_OPT_FLAG_READONLY
The option may not be set through the AVOptions API, only read.
Definition: opt.h:291
#define PES_HEADER_SIZE
Definition: mpegts.c:220
static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
Definition: mpegts.c:306
int64_t pts
Definition: mpegts.c:239
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3967
int use_padding
Definition: mpegts.h:77
AVCodecContext * avctx
The codec context used by avformat_find_stream_info, the parser, etc.
Definition: internal.h:153
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:1589
FILE * out
Definition: movenc.c:54
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:662
AVCodecParameters * codecpar
Definition: avformat.h:1230
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:328
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3957
static MpegTSFilter * mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
Definition: mpegts.c:508
int degr_prior_len
Definition: mpegts.h:85
static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
Definition: mpegts.c:1342
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:313
static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
Definition: mpegts.c:1530
AVIOContext pb
Definition: mpegts.c:1290
int stream_index
Definition: avcodec.h:1592
MpegTSFilterType
Definition: mpegts.c:56
#define MAX_MP4_DESCR_COUNT
Definition: mpegts.c:47
#define MKTAG(a, b, c, d)
Definition: common.h:342
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:938
static void mpegts_find_stream_type(AVStream *st, uint32_t stream_type, const StreamType *types)
Definition: mpegts.c:767
void avpriv_mpegts_parse_close(MpegTSContext *ts)
Definition: mpegts.c:2874
int au_len
Definition: mpegts.h:83
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1111
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1567
#define R8_CHECK_CLIP_MAX(dst, maxv)
uint32_t stream_type
Definition: mpegts.c:685
static char * getstr8(const uint8_t **pp, const uint8_t *p_end)
Definition: mpegts.c:633
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1583
#define FFMAX3(a, b, c)
Definition: common.h:95
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:242
#define av_unused
Definition: attributes.h:126
AVProgram ** programs
Definition: avformat.h:1481
#define MP4SLDescrTag
Definition: isom.h:254
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:2434
#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:1498