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mpegts.c
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1 /*
2  * MPEG2 transport stream (aka DVB) demuxer
3  * Copyright (c) 2002-2003 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/log.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/avassert.h"
30 #include "libavcodec/bytestream.h"
31 #include "libavcodec/get_bits.h"
32 #include "libavcodec/opus.h"
33 #include "avformat.h"
34 #include "mpegts.h"
35 #include "internal.h"
36 #include "avio_internal.h"
37 #include "seek.h"
38 #include "mpeg.h"
39 #include "isom.h"
40 
41 /* maximum size in which we look for synchronisation if
42  * synchronisation is lost */
43 #define MAX_RESYNC_SIZE 65536
44 
45 #define MAX_PES_PAYLOAD 200 * 1024
46 
47 #define MAX_MP4_DESCR_COUNT 16
48 
49 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
50  do { \
51  if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
52  (modulus) = (dividend) % (divisor); \
53  (prev_dividend) = (dividend); \
54  } while (0)
55 
60 };
61 
62 typedef struct MpegTSFilter MpegTSFilter;
63 
64 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
65  int is_start, int64_t pos);
66 
67 typedef struct MpegTSPESFilter {
69  void *opaque;
71 
72 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
73 
74 typedef void SetServiceCallback (void *opaque, int ret);
75 
76 typedef struct MpegTSSectionFilter {
80  unsigned int check_crc : 1;
81  unsigned int end_of_section_reached : 1;
83  void *opaque;
85 
86 struct MpegTSFilter {
87  int pid;
88  int es_id;
89  int last_cc; /* last cc code (-1 if first packet) */
90  int64_t last_pcr;
92  union {
95  } u;
96 };
97 
98 #define MAX_PIDS_PER_PROGRAM 64
99 struct Program {
100  unsigned int id; // program id/service id
101  unsigned int nb_pids;
102  unsigned int pids[MAX_PIDS_PER_PROGRAM];
103 
104  /** have we found pmt for this program */
106 };
107 
109  const AVClass *class;
110  /* user data */
112  /** raw packet size, including FEC if present */
114 
115  int size_stat[3];
117 #define SIZE_STAT_THRESHOLD 10
118 
119  int64_t pos47_full;
120 
121  /** if true, all pids are analyzed to find streams */
123 
124  /** compute exact PCR for each transport stream packet */
126 
127  /** fix dvb teletext pts */
129 
130  int64_t cur_pcr; /**< used to estimate the exact PCR */
131  int pcr_incr; /**< used to estimate the exact PCR */
132 
133  /* data needed to handle file based ts */
134  /** stop parsing loop */
136  /** packet containing Audio/Video data */
138  /** to detect seek */
139  int64_t last_pos;
140 
143 
145 
146  /******************************************/
147  /* private mpegts data */
148  /* scan context */
149  /** structure to keep track of Program->pids mapping */
150  unsigned int nb_prg;
151  struct Program *prg;
152 
154  /** filters for various streams specified by PMT + for the PAT and PMT */
157 };
158 
159 #define MPEGTS_OPTIONS \
160  { "resync_size", "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 }
161 
162 static const AVOption options[] = {
164  {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
165  {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
166  {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
168  {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
169  {.i64 = 0}, 0, 1, 0 },
170  {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
171  {.i64 = 0}, 0, 1, 0 },
172  { NULL },
173 };
174 
175 static const AVClass mpegts_class = {
176  .class_name = "mpegts demuxer",
177  .item_name = av_default_item_name,
178  .option = options,
179  .version = LIBAVUTIL_VERSION_INT,
180 };
181 
182 static const AVOption raw_options[] = {
184  { "compute_pcr", "Compute exact PCR for each transport stream packet.",
185  offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
186  { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
187  { "ts_packetsize", "Output option carrying the raw packet size.",
188  offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
189  { .i64 = 0 }, 0, 0,
191  { NULL },
192 };
193 
194 static const AVClass mpegtsraw_class = {
195  .class_name = "mpegtsraw demuxer",
196  .item_name = av_default_item_name,
197  .option = raw_options,
198  .version = LIBAVUTIL_VERSION_INT,
199 };
200 
201 /* TS stream handling */
202 
209 };
210 
211 /* enough for PES header + length */
212 #define PES_START_SIZE 6
213 #define PES_HEADER_SIZE 9
214 #define MAX_PES_HEADER_SIZE (9 + 255)
215 
216 typedef struct PESContext {
217  int pid;
218  int pcr_pid; /**< if -1 then all packets containing PCR are considered */
223  AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
225  /* used to get the format */
227  int flags; /**< copied to the AVPacket flags */
231  int64_t pts, dts;
232  int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
236 } PESContext;
237 
239 
240 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
241 {
242  int i;
243  for (i = 0; i < ts->nb_prg; i++) {
244  if (ts->prg[i].id == programid) {
245  return &ts->prg[i];
246  }
247  }
248  return NULL;
249 }
250 
251 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
252 {
253  AVProgram *prg = NULL;
254  int i;
255 
256  for (i = 0; i < ts->stream->nb_programs; i++)
257  if (ts->stream->programs[i]->id == programid) {
258  prg = ts->stream->programs[i];
259  break;
260  }
261  if (!prg)
262  return;
263  prg->nb_stream_indexes = 0;
264 }
265 
266 static void clear_program(MpegTSContext *ts, unsigned int programid)
267 {
268  int i;
269 
270  clear_avprogram(ts, programid);
271  for (i = 0; i < ts->nb_prg; i++)
272  if (ts->prg[i].id == programid) {
273  ts->prg[i].nb_pids = 0;
274  ts->prg[i].pmt_found = 0;
275  }
276 }
277 
279 {
280  av_freep(&ts->prg);
281  ts->nb_prg = 0;
282 }
283 
284 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
285 {
286  struct Program *p;
287  if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
288  ts->nb_prg = 0;
289  return;
290  }
291  p = &ts->prg[ts->nb_prg];
292  p->id = programid;
293  p->nb_pids = 0;
294  p->pmt_found = 0;
295  ts->nb_prg++;
296 }
297 
298 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
299  unsigned int pid)
300 {
301  struct Program *p = get_program(ts, programid);
302  if (!p)
303  return;
304 
305  if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
306  return;
307  p->pids[p->nb_pids++] = pid;
308 }
309 
310 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
311 {
312  struct Program *p = get_program(ts, programid);
313  if (!p)
314  return;
315 
316  p->pmt_found = 1;
317 }
318 
319 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
320 {
321  int i;
322  for (i = 0; i < s->nb_programs; i++) {
323  if (s->programs[i]->id == programid) {
324  s->programs[i]->pcr_pid = pid;
325  break;
326  }
327  }
328 }
329 
330 /**
331  * @brief discard_pid() decides if the pid is to be discarded according
332  * to caller's programs selection
333  * @param ts : - TS context
334  * @param pid : - pid
335  * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
336  * 0 otherwise
337  */
338 static int discard_pid(MpegTSContext *ts, unsigned int pid)
339 {
340  int i, j, k;
341  int used = 0, discarded = 0;
342  struct Program *p;
343 
344  /* If none of the programs have .discard=AVDISCARD_ALL then there's
345  * no way we have to discard this packet */
346  for (k = 0; k < ts->stream->nb_programs; k++)
347  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
348  break;
349  if (k == ts->stream->nb_programs)
350  return 0;
351 
352  for (i = 0; i < ts->nb_prg; i++) {
353  p = &ts->prg[i];
354  for (j = 0; j < p->nb_pids; j++) {
355  if (p->pids[j] != pid)
356  continue;
357  // is program with id p->id set to be discarded?
358  for (k = 0; k < ts->stream->nb_programs; k++) {
359  if (ts->stream->programs[k]->id == p->id) {
360  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
361  discarded++;
362  else
363  used++;
364  }
365  }
366  }
367  }
368 
369  return !used && discarded;
370 }
371 
372 /**
373  * Assemble PES packets out of TS packets, and then call the "section_cb"
374  * function when they are complete.
375  */
377  const uint8_t *buf, int buf_size, int is_start)
378 {
379  MpegTSSectionFilter *tss = &tss1->u.section_filter;
380  int len;
381 
382  if (is_start) {
383  memcpy(tss->section_buf, buf, buf_size);
384  tss->section_index = buf_size;
385  tss->section_h_size = -1;
386  tss->end_of_section_reached = 0;
387  } else {
388  if (tss->end_of_section_reached)
389  return;
390  len = 4096 - tss->section_index;
391  if (buf_size < len)
392  len = buf_size;
393  memcpy(tss->section_buf + tss->section_index, buf, len);
394  tss->section_index += len;
395  }
396 
397  /* compute section length if possible */
398  if (tss->section_h_size == -1 && tss->section_index >= 3) {
399  len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
400  if (len > 4096)
401  return;
402  tss->section_h_size = len;
403  }
404 
405  if (tss->section_h_size != -1 &&
406  tss->section_index >= tss->section_h_size) {
407  int crc_valid = 1;
408  tss->end_of_section_reached = 1;
409 
410  if (tss->check_crc) {
411  crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
412  if (crc_valid) {
413  ts->crc_validity[ tss1->pid ] = 100;
414  }else if (ts->crc_validity[ tss1->pid ] > -10) {
415  ts->crc_validity[ tss1->pid ]--;
416  }else
417  crc_valid = 2;
418  }
419  if (crc_valid)
420  tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
421  }
422 }
423 
424 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
425  enum MpegTSFilterType type)
426 {
428 
429  av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
430 
431  if (pid >= NB_PID_MAX || ts->pids[pid])
432  return NULL;
433  filter = av_mallocz(sizeof(MpegTSFilter));
434  if (!filter)
435  return NULL;
436  ts->pids[pid] = filter;
437 
438  filter->type = type;
439  filter->pid = pid;
440  filter->es_id = -1;
441  filter->last_cc = -1;
442  filter->last_pcr= -1;
443 
444  return filter;
445 }
446 
448  unsigned int pid,
449  SectionCallback *section_cb,
450  void *opaque,
451  int check_crc)
452 {
454  MpegTSSectionFilter *sec;
455 
456  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
457  return NULL;
458  sec = &filter->u.section_filter;
459  sec->section_cb = section_cb;
460  sec->opaque = opaque;
462  sec->check_crc = check_crc;
463  if (!sec->section_buf) {
464  av_free(filter);
465  return NULL;
466  }
467  return filter;
468 }
469 
470 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
471  PESCallback *pes_cb,
472  void *opaque)
473 {
475  MpegTSPESFilter *pes;
476 
477  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
478  return NULL;
479 
480  pes = &filter->u.pes_filter;
481  pes->pes_cb = pes_cb;
482  pes->opaque = opaque;
483  return filter;
484 }
485 
486 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
487 {
488  return mpegts_open_filter(ts, pid, MPEGTS_PCR);
489 }
490 
492 {
493  int pid;
494 
495  pid = filter->pid;
496  if (filter->type == MPEGTS_SECTION)
498  else if (filter->type == MPEGTS_PES) {
499  PESContext *pes = filter->u.pes_filter.opaque;
500  av_buffer_unref(&pes->buffer);
501  /* referenced private data will be freed later in
502  * avformat_close_input */
503  if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
504  av_freep(&filter->u.pes_filter.opaque);
505  }
506  }
507 
508  av_free(filter);
509  ts->pids[pid] = NULL;
510 }
511 
512 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
513 {
514  int stat[TS_MAX_PACKET_SIZE];
515  int stat_all = 0;
516  int i;
517  int best_score = 0;
518 
519  memset(stat, 0, packet_size * sizeof(*stat));
520 
521  for (i = 0; i < size - 3; i++) {
522  if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
523  int x = i % packet_size;
524  stat[x]++;
525  stat_all++;
526  if (stat[x] > best_score) {
527  best_score = stat[x];
528  if (index)
529  *index = x;
530  }
531  }
532  }
533 
534  return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
535 }
536 
537 /* autodetect fec presence. Must have at least 1024 bytes */
538 static int get_packet_size(const uint8_t *buf, int size)
539 {
540  int score, fec_score, dvhs_score;
541 
542  if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
543  return AVERROR_INVALIDDATA;
544 
545  score = analyze(buf, size, TS_PACKET_SIZE, NULL);
546  dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
547  fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
548  av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
549  score, dvhs_score, fec_score);
550 
551  if (score > fec_score && score > dvhs_score)
552  return TS_PACKET_SIZE;
553  else if (dvhs_score > score && dvhs_score > fec_score)
554  return TS_DVHS_PACKET_SIZE;
555  else if (score < fec_score && dvhs_score < fec_score)
556  return TS_FEC_PACKET_SIZE;
557  else
558  return AVERROR_INVALIDDATA;
559 }
560 
561 typedef struct SectionHeader {
563  uint16_t id;
567 } SectionHeader;
568 
569 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
570 {
571  const uint8_t *p;
572  int c;
573 
574  p = *pp;
575  if (p >= p_end)
576  return AVERROR_INVALIDDATA;
577  c = *p++;
578  *pp = p;
579  return c;
580 }
581 
582 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
583 {
584  const uint8_t *p;
585  int c;
586 
587  p = *pp;
588  if ((p + 1) >= p_end)
589  return AVERROR_INVALIDDATA;
590  c = AV_RB16(p);
591  p += 2;
592  *pp = p;
593  return c;
594 }
595 
596 /* read and allocate a DVB string preceded by its length */
597 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
598 {
599  int len;
600  const uint8_t *p;
601  char *str;
602 
603  p = *pp;
604  len = get8(&p, p_end);
605  if (len < 0)
606  return NULL;
607  if ((p + len) > p_end)
608  return NULL;
609  str = av_malloc(len + 1);
610  if (!str)
611  return NULL;
612  memcpy(str, p, len);
613  str[len] = '\0';
614  p += len;
615  *pp = p;
616  return str;
617 }
618 
620  const uint8_t **pp, const uint8_t *p_end)
621 {
622  int val;
623 
624  val = get8(pp, p_end);
625  if (val < 0)
626  return val;
627  h->tid = val;
628  *pp += 2;
629  val = get16(pp, p_end);
630  if (val < 0)
631  return val;
632  h->id = val;
633  val = get8(pp, p_end);
634  if (val < 0)
635  return val;
636  h->version = (val >> 1) & 0x1f;
637  val = get8(pp, p_end);
638  if (val < 0)
639  return val;
640  h->sec_num = val;
641  val = get8(pp, p_end);
642  if (val < 0)
643  return val;
644  h->last_sec_num = val;
645  return 0;
646 }
647 
648 typedef struct {
649  uint32_t stream_type;
652 } StreamType;
653 
654 static const StreamType ISO_types[] = {
661  /* Makito encoder sets stream type 0x11 for AAC,
662  * so auto-detect LOAS/LATM instead of hardcoding it. */
663 #if !CONFIG_LOAS_DEMUXER
664  { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
665 #endif
671  { 0 },
672 };
673 
674 static const StreamType HDMV_types[] = {
680  { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
681  { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
682  { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
683  { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
685  { 0 },
686 };
687 
688 /* ATSC ? */
689 static const StreamType MISC_types[] = {
692  { 0 },
693 };
694 
695 static const StreamType REGD_types[] = {
696  { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
697  { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
698  { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
699  { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
700  { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
701  { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
702  { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
703  { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
704  { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
705  { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
706  { 0 },
707 };
708 
709 static const StreamType METADATA_types[] = {
710  { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
711  { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
712  { 0 },
713 };
714 
715 /* descriptor present */
716 static const StreamType DESC_types[] = {
717  { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
718  { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
721  { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
722  { 0 },
723 };
724 
726  uint32_t stream_type,
727  const StreamType *types)
728 {
729  if (avcodec_is_open(st->codec)) {
730  av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
731  return;
732  }
733 
734  for (; types->stream_type; types++)
735  if (stream_type == types->stream_type) {
736  st->codec->codec_type = types->codec_type;
737  st->codec->codec_id = types->codec_id;
738  st->request_probe = 0;
739  return;
740  }
741 }
742 
744  uint32_t stream_type, uint32_t prog_reg_desc)
745 {
746  int old_codec_type = st->codec->codec_type;
747  int old_codec_id = st->codec->codec_id;
748 
749  if (avcodec_is_open(st->codec)) {
750  av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
751  return 0;
752  }
753 
754  avpriv_set_pts_info(st, 33, 1, 90000);
755  st->priv_data = pes;
759  pes->st = st;
760  pes->stream_type = stream_type;
761 
762  av_log(pes->stream, AV_LOG_DEBUG,
763  "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
764  st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
765 
766  st->codec->codec_tag = pes->stream_type;
767 
768  mpegts_find_stream_type(st, pes->stream_type, ISO_types);
769  if ((prog_reg_desc == AV_RL32("HDMV") ||
770  prog_reg_desc == AV_RL32("HDPR")) &&
771  st->codec->codec_id == AV_CODEC_ID_NONE) {
772  mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
773  if (pes->stream_type == 0x83) {
774  // HDMV TrueHD streams also contain an AC3 coded version of the
775  // audio track - add a second stream for this
776  AVStream *sub_st;
777  // priv_data cannot be shared between streams
778  PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
779  if (!sub_pes)
780  return AVERROR(ENOMEM);
781  memcpy(sub_pes, pes, sizeof(*sub_pes));
782 
783  sub_st = avformat_new_stream(pes->stream, NULL);
784  if (!sub_st) {
785  av_free(sub_pes);
786  return AVERROR(ENOMEM);
787  }
788 
789  sub_st->id = pes->pid;
790  avpriv_set_pts_info(sub_st, 33, 1, 90000);
791  sub_st->priv_data = sub_pes;
793  sub_st->codec->codec_id = AV_CODEC_ID_AC3;
795  sub_pes->sub_st = pes->sub_st = sub_st;
796  }
797  }
798  if (st->codec->codec_id == AV_CODEC_ID_NONE)
799  mpegts_find_stream_type(st, pes->stream_type, MISC_types);
800  if (st->codec->codec_id == AV_CODEC_ID_NONE) {
801  st->codec->codec_id = old_codec_id;
802  st->codec->codec_type = old_codec_type;
803  }
804 
805  return 0;
806 }
807 
809 {
810  pes->pts = AV_NOPTS_VALUE;
811  pes->dts = AV_NOPTS_VALUE;
812  pes->data_index = 0;
813  pes->flags = 0;
814  av_buffer_unref(&pes->buffer);
815 }
816 
818 {
819  av_init_packet(pkt);
820 
821  pkt->buf = pes->buffer;
822  pkt->data = pes->buffer->data;
823  pkt->size = pes->data_index;
824 
825  if (pes->total_size != MAX_PES_PAYLOAD &&
826  pes->pes_header_size + pes->data_index != pes->total_size +
827  PES_START_SIZE) {
828  av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
829  pes->flags |= AV_PKT_FLAG_CORRUPT;
830  }
831  memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
832 
833  // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
834  if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
835  pkt->stream_index = pes->sub_st->index;
836  else
837  pkt->stream_index = pes->st->index;
838  pkt->pts = pes->pts;
839  pkt->dts = pes->dts;
840  /* store position of first TS packet of this PES packet */
841  pkt->pos = pes->ts_packet_pos;
842  pkt->flags = pes->flags;
843 
844  pes->buffer = NULL;
846 }
847 
848 static uint64_t get_ts64(GetBitContext *gb, int bits)
849 {
850  if (get_bits_left(gb) < bits)
851  return AV_NOPTS_VALUE;
852  return get_bits64(gb, bits);
853 }
854 
856  const uint8_t *buf, int buf_size)
857 {
858  GetBitContext gb;
859  int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
860  int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
861  int dts_flag = -1, cts_flag = -1;
862  int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
863  uint8_t buf_padded[128 + FF_INPUT_BUFFER_PADDING_SIZE];
864  int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - FF_INPUT_BUFFER_PADDING_SIZE);
865 
866  memcpy(buf_padded, buf, buf_padded_size);
867 
868  init_get_bits(&gb, buf_padded, buf_padded_size * 8);
869 
870  if (sl->use_au_start)
871  au_start_flag = get_bits1(&gb);
872  if (sl->use_au_end)
873  au_end_flag = get_bits1(&gb);
874  if (!sl->use_au_start && !sl->use_au_end)
875  au_start_flag = au_end_flag = 1;
876  if (sl->ocr_len > 0)
877  ocr_flag = get_bits1(&gb);
878  if (sl->use_idle)
879  idle_flag = get_bits1(&gb);
880  if (sl->use_padding)
881  padding_flag = get_bits1(&gb);
882  if (padding_flag)
883  padding_bits = get_bits(&gb, 3);
884 
885  if (!idle_flag && (!padding_flag || padding_bits != 0)) {
886  if (sl->packet_seq_num_len)
888  if (sl->degr_prior_len)
889  if (get_bits1(&gb))
890  skip_bits(&gb, sl->degr_prior_len);
891  if (ocr_flag)
892  skip_bits_long(&gb, sl->ocr_len);
893  if (au_start_flag) {
894  if (sl->use_rand_acc_pt)
895  get_bits1(&gb);
896  if (sl->au_seq_num_len > 0)
897  skip_bits_long(&gb, sl->au_seq_num_len);
898  if (sl->use_timestamps) {
899  dts_flag = get_bits1(&gb);
900  cts_flag = get_bits1(&gb);
901  }
902  }
903  if (sl->inst_bitrate_len)
904  inst_bitrate_flag = get_bits1(&gb);
905  if (dts_flag == 1)
906  dts = get_ts64(&gb, sl->timestamp_len);
907  if (cts_flag == 1)
908  cts = get_ts64(&gb, sl->timestamp_len);
909  if (sl->au_len > 0)
910  skip_bits_long(&gb, sl->au_len);
911  if (inst_bitrate_flag)
913  }
914 
915  if (dts != AV_NOPTS_VALUE)
916  pes->dts = dts;
917  if (cts != AV_NOPTS_VALUE)
918  pes->pts = cts;
919 
920  if (sl->timestamp_len && sl->timestamp_res)
922 
923  return (get_bits_count(&gb) + 7) >> 3;
924 }
925 
926 /* return non zero if a packet could be constructed */
928  const uint8_t *buf, int buf_size, int is_start,
929  int64_t pos)
930 {
931  PESContext *pes = filter->u.pes_filter.opaque;
932  MpegTSContext *ts = pes->ts;
933  const uint8_t *p;
934  int len, code;
935 
936  if (!ts->pkt)
937  return 0;
938 
939  if (is_start) {
940  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
941  new_pes_packet(pes, ts->pkt);
942  ts->stop_parse = 1;
943  } else {
945  }
946  pes->state = MPEGTS_HEADER;
947  pes->ts_packet_pos = pos;
948  }
949  p = buf;
950  while (buf_size > 0) {
951  switch (pes->state) {
952  case MPEGTS_HEADER:
953  len = PES_START_SIZE - pes->data_index;
954  if (len > buf_size)
955  len = buf_size;
956  memcpy(pes->header + pes->data_index, p, len);
957  pes->data_index += len;
958  p += len;
959  buf_size -= len;
960  if (pes->data_index == PES_START_SIZE) {
961  /* we got all the PES or section header. We can now
962  * decide */
963  if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
964  pes->header[2] == 0x01) {
965  /* it must be an mpeg2 PES stream */
966  code = pes->header[3] | 0x100;
967  av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
968  code);
969 
970  if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
971  (!pes->sub_st ||
972  pes->sub_st->discard == AVDISCARD_ALL)) ||
973  code == 0x1be) /* padding_stream */
974  goto skip;
975 
976  /* stream not present in PMT */
977  if (!pes->st) {
978  if (ts->skip_changes)
979  goto skip;
980 
981  pes->st = avformat_new_stream(ts->stream, NULL);
982  if (!pes->st)
983  return AVERROR(ENOMEM);
984  pes->st->id = pes->pid;
985  mpegts_set_stream_info(pes->st, pes, 0, 0);
986  }
987 
988  pes->total_size = AV_RB16(pes->header + 4);
989  /* NOTE: a zero total size means the PES size is
990  * unbounded */
991  if (!pes->total_size)
993 
994  /* allocate pes buffer */
995  pes->buffer = av_buffer_alloc(pes->total_size +
997  if (!pes->buffer)
998  return AVERROR(ENOMEM);
999 
1000  if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1001  code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1002  code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1003  code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1004  pes->state = MPEGTS_PESHEADER;
1005  if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1006  av_dlog(pes->stream,
1007  "pid=%x stream_type=%x probing\n",
1008  pes->pid,
1009  pes->stream_type);
1010  pes->st->request_probe = 1;
1011  }
1012  } else {
1013  pes->state = MPEGTS_PAYLOAD;
1014  pes->data_index = 0;
1015  }
1016  } else {
1017  /* otherwise, it should be a table */
1018  /* skip packet */
1019 skip:
1020  pes->state = MPEGTS_SKIP;
1021  continue;
1022  }
1023  }
1024  break;
1025  /**********************************************/
1026  /* PES packing parsing */
1027  case MPEGTS_PESHEADER:
1028  len = PES_HEADER_SIZE - pes->data_index;
1029  if (len < 0)
1030  return AVERROR_INVALIDDATA;
1031  if (len > buf_size)
1032  len = buf_size;
1033  memcpy(pes->header + pes->data_index, p, len);
1034  pes->data_index += len;
1035  p += len;
1036  buf_size -= len;
1037  if (pes->data_index == PES_HEADER_SIZE) {
1038  pes->pes_header_size = pes->header[8] + 9;
1040  }
1041  break;
1042  case MPEGTS_PESHEADER_FILL:
1043  len = pes->pes_header_size - pes->data_index;
1044  if (len < 0)
1045  return AVERROR_INVALIDDATA;
1046  if (len > buf_size)
1047  len = buf_size;
1048  memcpy(pes->header + pes->data_index, p, len);
1049  pes->data_index += len;
1050  p += len;
1051  buf_size -= len;
1052  if (pes->data_index == pes->pes_header_size) {
1053  const uint8_t *r;
1054  unsigned int flags, pes_ext, skip;
1055 
1056  flags = pes->header[7];
1057  r = pes->header + 9;
1058  pes->pts = AV_NOPTS_VALUE;
1059  pes->dts = AV_NOPTS_VALUE;
1060  if ((flags & 0xc0) == 0x80) {
1061  pes->dts = pes->pts = ff_parse_pes_pts(r);
1062  r += 5;
1063  } else if ((flags & 0xc0) == 0xc0) {
1064  pes->pts = ff_parse_pes_pts(r);
1065  r += 5;
1066  pes->dts = ff_parse_pes_pts(r);
1067  r += 5;
1068  }
1069  pes->extended_stream_id = -1;
1070  if (flags & 0x01) { /* PES extension */
1071  pes_ext = *r++;
1072  /* Skip PES private data, program packet sequence counter and P-STD buffer */
1073  skip = (pes_ext >> 4) & 0xb;
1074  skip += skip & 0x9;
1075  r += skip;
1076  if ((pes_ext & 0x41) == 0x01 &&
1077  (r + 2) <= (pes->header + pes->pes_header_size)) {
1078  /* PES extension 2 */
1079  if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1080  pes->extended_stream_id = r[1];
1081  }
1082  }
1083 
1084  /* we got the full header. We parse it and get the payload */
1085  pes->state = MPEGTS_PAYLOAD;
1086  pes->data_index = 0;
1087  if (pes->stream_type == 0x12 && buf_size > 0) {
1088  int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1089  buf_size);
1090  pes->pes_header_size += sl_header_bytes;
1091  p += sl_header_bytes;
1092  buf_size -= sl_header_bytes;
1093  }
1094  if (pes->stream_type == 0x15 && buf_size >= 5) {
1095  /* skip metadata access unit header */
1096  pes->pes_header_size += 5;
1097  p += 5;
1098  buf_size -= 5;
1099  }
1100  if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1101  AVProgram *p = NULL;
1102  while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1103  if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1104  MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1105  if (f) {
1106  AVStream *st = NULL;
1107  if (f->type == MPEGTS_PES) {
1108  PESContext *pcrpes = f->u.pes_filter.opaque;
1109  if (pcrpes)
1110  st = pcrpes->st;
1111  } else if (f->type == MPEGTS_PCR) {
1112  int i;
1113  for (i = 0; i < p->nb_stream_indexes; i++) {
1114  AVStream *pst = pes->stream->streams[p->stream_index[i]];
1115  if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1116  st = pst;
1117  }
1118  }
1119  if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1120  // teletext packets do not always have correct timestamps,
1121  // the standard says they should be handled after 40.6 ms at most,
1122  // and the pcr error to this packet should be no more than 100 ms.
1123  // TODO: we should interpolate the PCR, not just use the last one
1124  int64_t pcr = f->last_pcr / 300;
1127  if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1128  pes->pts = pes->dts = pcr;
1129  } else if (pes->dts > pcr + 3654 + 9000) {
1130  pes->pts = pes->dts = pcr + 3654 + 9000;
1131  }
1132  break;
1133  }
1134  }
1135  }
1136  }
1137  }
1138  }
1139  break;
1140  case MPEGTS_PAYLOAD:
1141  if (pes->buffer) {
1142  if (pes->data_index > 0 &&
1143  pes->data_index + buf_size > pes->total_size) {
1144  new_pes_packet(pes, ts->pkt);
1145  pes->total_size = MAX_PES_PAYLOAD;
1146  pes->buffer = av_buffer_alloc(pes->total_size +
1148  if (!pes->buffer)
1149  return AVERROR(ENOMEM);
1150  ts->stop_parse = 1;
1151  } else if (pes->data_index == 0 &&
1152  buf_size > pes->total_size) {
1153  // pes packet size is < ts size packet and pes data is padded with 0xff
1154  // not sure if this is legal in ts but see issue #2392
1155  buf_size = pes->total_size;
1156  }
1157  memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1158  pes->data_index += buf_size;
1159  /* emit complete packets with known packet size
1160  * decreases demuxer delay for infrequent packets like subtitles from
1161  * a couple of seconds to milliseconds for properly muxed files.
1162  * total_size is the number of bytes following pes_packet_length
1163  * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1164  if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1165  pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1166  ts->stop_parse = 1;
1167  new_pes_packet(pes, ts->pkt);
1168  }
1169  }
1170  buf_size = 0;
1171  break;
1172  case MPEGTS_SKIP:
1173  buf_size = 0;
1174  break;
1175  }
1176  }
1177 
1178  return 0;
1179 }
1180 
1181 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1182 {
1183  MpegTSFilter *tss;
1184  PESContext *pes;
1185 
1186  /* if no pid found, then add a pid context */
1187  pes = av_mallocz(sizeof(PESContext));
1188  if (!pes)
1189  return 0;
1190  pes->ts = ts;
1191  pes->stream = ts->stream;
1192  pes->pid = pid;
1193  pes->pcr_pid = pcr_pid;
1194  pes->state = MPEGTS_SKIP;
1195  pes->pts = AV_NOPTS_VALUE;
1196  pes->dts = AV_NOPTS_VALUE;
1197  tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1198  if (!tss) {
1199  av_free(pes);
1200  return 0;
1201  }
1202  return pes;
1203 }
1204 
1205 #define MAX_LEVEL 4
1206 typedef struct {
1213  int level;
1216 
1218  const uint8_t *buf, unsigned size,
1219  Mp4Descr *descr, int max_descr_count)
1220 {
1221  int ret;
1222  if (size > (1 << 30))
1223  return AVERROR_INVALIDDATA;
1224 
1225  if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1226  NULL, NULL, NULL, NULL)) < 0)
1227  return ret;
1228 
1229  d->s = s;
1230  d->level = 0;
1231  d->descr_count = 0;
1232  d->descr = descr;
1233  d->active_descr = NULL;
1234  d->max_descr_count = max_descr_count;
1235 
1236  return 0;
1237 }
1238 
1239 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1240 {
1241  int64_t new_off = avio_tell(pb);
1242  (*len) -= new_off - *off;
1243  *off = new_off;
1244 }
1245 
1246 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1247  int target_tag);
1248 
1249 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1250 {
1251  while (len > 0) {
1252  int ret = parse_mp4_descr(d, off, len, 0);
1253  if (ret < 0)
1254  return ret;
1255  update_offsets(&d->pb, &off, &len);
1256  }
1257  return 0;
1258 }
1259 
1260 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1261 {
1262  avio_rb16(&d->pb); // ID
1263  avio_r8(&d->pb);
1264  avio_r8(&d->pb);
1265  avio_r8(&d->pb);
1266  avio_r8(&d->pb);
1267  avio_r8(&d->pb);
1268  update_offsets(&d->pb, &off, &len);
1269  return parse_mp4_descr_arr(d, off, len);
1270 }
1271 
1272 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1273 {
1274  int id_flags;
1275  if (len < 2)
1276  return 0;
1277  id_flags = avio_rb16(&d->pb);
1278  if (!(id_flags & 0x0020)) { // URL_Flag
1279  update_offsets(&d->pb, &off, &len);
1280  return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1281  } else {
1282  return 0;
1283  }
1284 }
1285 
1286 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1287 {
1288  int es_id = 0;
1289  if (d->descr_count >= d->max_descr_count)
1290  return AVERROR_INVALIDDATA;
1291  ff_mp4_parse_es_descr(&d->pb, &es_id);
1292  d->active_descr = d->descr + (d->descr_count++);
1293 
1294  d->active_descr->es_id = es_id;
1295  update_offsets(&d->pb, &off, &len);
1296  parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1297  update_offsets(&d->pb, &off, &len);
1298  if (len > 0)
1299  parse_mp4_descr(d, off, len, MP4SLDescrTag);
1300  d->active_descr = NULL;
1301  return 0;
1302 }
1303 
1305  int len)
1306 {
1307  Mp4Descr *descr = d->active_descr;
1308  if (!descr)
1309  return AVERROR_INVALIDDATA;
1311  if (!descr->dec_config_descr)
1312  return AVERROR(ENOMEM);
1313  descr->dec_config_descr_len = len;
1314  avio_read(&d->pb, descr->dec_config_descr, len);
1315  return 0;
1316 }
1317 
1318 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1319 {
1320  Mp4Descr *descr = d->active_descr;
1321  int predefined;
1322  if (!descr)
1323  return AVERROR_INVALIDDATA;
1324 
1325  predefined = avio_r8(&d->pb);
1326  if (!predefined) {
1327  int lengths;
1328  int flags = avio_r8(&d->pb);
1329  descr->sl.use_au_start = !!(flags & 0x80);
1330  descr->sl.use_au_end = !!(flags & 0x40);
1331  descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1332  descr->sl.use_padding = !!(flags & 0x08);
1333  descr->sl.use_timestamps = !!(flags & 0x04);
1334  descr->sl.use_idle = !!(flags & 0x02);
1335  descr->sl.timestamp_res = avio_rb32(&d->pb);
1336  avio_rb32(&d->pb);
1337  descr->sl.timestamp_len = avio_r8(&d->pb);
1338  if (descr->sl.timestamp_len > 64) {
1339  avpriv_request_sample(NULL, "timestamp_len > 64");
1340  descr->sl.timestamp_len = 64;
1341  return AVERROR_PATCHWELCOME;
1342  }
1343  descr->sl.ocr_len = avio_r8(&d->pb);
1344  descr->sl.au_len = avio_r8(&d->pb);
1345  descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1346  lengths = avio_rb16(&d->pb);
1347  descr->sl.degr_prior_len = lengths >> 12;
1348  descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1349  descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1350  } else if (!d->predefined_SLConfigDescriptor_seen){
1351  avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1353  }
1354  return 0;
1355 }
1356 
1357 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1358  int target_tag)
1359 {
1360  int tag;
1361  int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1362  update_offsets(&d->pb, &off, &len);
1363  if (len < 0 || len1 > len || len1 <= 0) {
1364  av_log(d->s, AV_LOG_ERROR,
1365  "Tag %x length violation new length %d bytes remaining %d\n",
1366  tag, len1, len);
1367  return AVERROR_INVALIDDATA;
1368  }
1369 
1370  if (d->level++ >= MAX_LEVEL) {
1371  av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1372  goto done;
1373  }
1374 
1375  if (target_tag && tag != target_tag) {
1376  av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1377  target_tag);
1378  goto done;
1379  }
1380 
1381  switch (tag) {
1382  case MP4IODescrTag:
1383  parse_MP4IODescrTag(d, off, len1);
1384  break;
1385  case MP4ODescrTag:
1386  parse_MP4ODescrTag(d, off, len1);
1387  break;
1388  case MP4ESDescrTag:
1389  parse_MP4ESDescrTag(d, off, len1);
1390  break;
1391  case MP4DecConfigDescrTag:
1392  parse_MP4DecConfigDescrTag(d, off, len1);
1393  break;
1394  case MP4SLDescrTag:
1395  parse_MP4SLDescrTag(d, off, len1);
1396  break;
1397  }
1398 
1399 
1400 done:
1401  d->level--;
1402  avio_seek(&d->pb, off + len1, SEEK_SET);
1403  return 0;
1404 }
1405 
1406 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1407  Mp4Descr *descr, int *descr_count, int max_descr_count)
1408 {
1410  int ret;
1411 
1412  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1413  if (ret < 0)
1414  return ret;
1415 
1416  ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1417 
1418  *descr_count = d.descr_count;
1419  return ret;
1420 }
1421 
1422 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1423  Mp4Descr *descr, int *descr_count, int max_descr_count)
1424 {
1426  int ret;
1427 
1428  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1429  if (ret < 0)
1430  return ret;
1431 
1432  ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1433 
1434  *descr_count = d.descr_count;
1435  return ret;
1436 }
1437 
1439  int section_len)
1440 {
1441  MpegTSContext *ts = filter->u.section_filter.opaque;
1442  SectionHeader h;
1443  const uint8_t *p, *p_end;
1444  AVIOContext pb;
1445  int mp4_descr_count = 0;
1446  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1447  int i, pid;
1448  AVFormatContext *s = ts->stream;
1449 
1450  p_end = section + section_len - 4;
1451  p = section;
1452  if (parse_section_header(&h, &p, p_end) < 0)
1453  return;
1454  if (h.tid != M4OD_TID)
1455  return;
1456 
1457  mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1459 
1460  for (pid = 0; pid < NB_PID_MAX; pid++) {
1461  if (!ts->pids[pid])
1462  continue;
1463  for (i = 0; i < mp4_descr_count; i++) {
1464  PESContext *pes;
1465  AVStream *st;
1466  if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1467  continue;
1468  if (ts->pids[pid]->type != MPEGTS_PES) {
1469  av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1470  continue;
1471  }
1472  pes = ts->pids[pid]->u.pes_filter.opaque;
1473  st = pes->st;
1474  if (!st)
1475  continue;
1476 
1477  pes->sl = mp4_descr[i].sl;
1478 
1479  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1480  mp4_descr[i].dec_config_descr_len, 0,
1481  NULL, NULL, NULL, NULL);
1482  ff_mp4_read_dec_config_descr(s, st, &pb);
1483  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1484  st->codec->extradata_size > 0)
1485  st->need_parsing = 0;
1486  if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1487  st->codec->extradata_size > 0)
1488  st->need_parsing = 0;
1489 
1490  if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1491  // do nothing
1492  } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1494  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1496  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1498  }
1499  }
1500  for (i = 0; i < mp4_descr_count; i++)
1501  av_free(mp4_descr[i].dec_config_descr);
1502 }
1503 
1505  1, 0, 1, 1, 2, 2, 2, 3, 3
1506 };
1507 
1508 static const uint8_t opus_channel_map[8][8] = {
1509  { 0 },
1510  { 0,1 },
1511  { 0,2,1 },
1512  { 0,1,2,3 },
1513  { 0,4,1,2,3 },
1514  { 0,4,1,2,3,5 },
1515  { 0,4,1,2,3,5,6 },
1516  { 0,6,1,2,3,4,5,7 },
1517 };
1518 
1520  const uint8_t **pp, const uint8_t *desc_list_end,
1521  Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1522  MpegTSContext *ts)
1523 {
1524  const uint8_t *desc_end;
1525  int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1526  char language[252];
1527  int i;
1528 
1529  desc_tag = get8(pp, desc_list_end);
1530  if (desc_tag < 0)
1531  return AVERROR_INVALIDDATA;
1532  desc_len = get8(pp, desc_list_end);
1533  if (desc_len < 0)
1534  return AVERROR_INVALIDDATA;
1535  desc_end = *pp + desc_len;
1536  if (desc_end > desc_list_end)
1537  return AVERROR_INVALIDDATA;
1538 
1539  av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1540 
1541  if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1542  stream_type == STREAM_TYPE_PRIVATE_DATA)
1543  mpegts_find_stream_type(st, desc_tag, DESC_types);
1544 
1545  switch (desc_tag) {
1546  case 0x1E: /* SL descriptor */
1547  desc_es_id = get16(pp, desc_end);
1548  if (ts && ts->pids[pid])
1549  ts->pids[pid]->es_id = desc_es_id;
1550  for (i = 0; i < mp4_descr_count; i++)
1551  if (mp4_descr[i].dec_config_descr_len &&
1552  mp4_descr[i].es_id == desc_es_id) {
1553  AVIOContext pb;
1554  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1555  mp4_descr[i].dec_config_descr_len, 0,
1556  NULL, NULL, NULL, NULL);
1557  ff_mp4_read_dec_config_descr(fc, st, &pb);
1558  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1559  st->codec->extradata_size > 0)
1560  st->need_parsing = 0;
1562  mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1563  }
1564  break;
1565  case 0x1F: /* FMC descriptor */
1566  get16(pp, desc_end);
1567  if (mp4_descr_count > 0 &&
1568  (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1569  mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1570  AVIOContext pb;
1571  ffio_init_context(&pb, mp4_descr->dec_config_descr,
1572  mp4_descr->dec_config_descr_len, 0,
1573  NULL, NULL, NULL, NULL);
1574  ff_mp4_read_dec_config_descr(fc, st, &pb);
1575  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1576  st->codec->extradata_size > 0) {
1577  st->request_probe = st->need_parsing = 0;
1579  }
1580  }
1581  break;
1582  case 0x56: /* DVB teletext descriptor */
1583  {
1584  uint8_t *extradata = NULL;
1585  int language_count = desc_len / 5;
1586 
1587  if (desc_len > 0 && desc_len % 5 != 0)
1588  return AVERROR_INVALIDDATA;
1589 
1590  if (language_count > 0) {
1591  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1592  if (language_count > sizeof(language) / 4) {
1593  language_count = sizeof(language) / 4;
1594  }
1595 
1596  if (st->codec->extradata == NULL) {
1597  if (ff_alloc_extradata(st->codec, language_count * 2)) {
1598  return AVERROR(ENOMEM);
1599  }
1600  }
1601 
1602  if (st->codec->extradata_size < language_count * 2)
1603  return AVERROR_INVALIDDATA;
1604 
1605  extradata = st->codec->extradata;
1606 
1607  for (i = 0; i < language_count; i++) {
1608  language[i * 4 + 0] = get8(pp, desc_end);
1609  language[i * 4 + 1] = get8(pp, desc_end);
1610  language[i * 4 + 2] = get8(pp, desc_end);
1611  language[i * 4 + 3] = ',';
1612 
1613  memcpy(extradata, *pp, 2);
1614  extradata += 2;
1615 
1616  *pp += 2;
1617  }
1618 
1619  language[i * 4 - 1] = 0;
1620  av_dict_set(&st->metadata, "language", language, 0);
1621  }
1622  }
1623  break;
1624  case 0x59: /* subtitling descriptor */
1625  {
1626  /* 8 bytes per DVB subtitle substream data:
1627  * ISO_639_language_code (3 bytes),
1628  * subtitling_type (1 byte),
1629  * composition_page_id (2 bytes),
1630  * ancillary_page_id (2 bytes) */
1631  int language_count = desc_len / 8;
1632 
1633  if (desc_len > 0 && desc_len % 8 != 0)
1634  return AVERROR_INVALIDDATA;
1635 
1636  if (language_count > 1) {
1637  avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1638  }
1639 
1640  if (language_count > 0) {
1641  uint8_t *extradata;
1642 
1643  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1644  if (language_count > sizeof(language) / 4) {
1645  language_count = sizeof(language) / 4;
1646  }
1647 
1648  if (st->codec->extradata == NULL) {
1649  if (ff_alloc_extradata(st->codec, language_count * 5)) {
1650  return AVERROR(ENOMEM);
1651  }
1652  }
1653 
1654  if (st->codec->extradata_size < language_count * 5)
1655  return AVERROR_INVALIDDATA;
1656 
1657  extradata = st->codec->extradata;
1658 
1659  for (i = 0; i < language_count; i++) {
1660  language[i * 4 + 0] = get8(pp, desc_end);
1661  language[i * 4 + 1] = get8(pp, desc_end);
1662  language[i * 4 + 2] = get8(pp, desc_end);
1663  language[i * 4 + 3] = ',';
1664 
1665  /* hearing impaired subtitles detection using subtitling_type */
1666  switch (*pp[0]) {
1667  case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1668  case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1669  case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1670  case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1671  case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1672  case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1674  break;
1675  }
1676 
1677  extradata[4] = get8(pp, desc_end); /* subtitling_type */
1678  memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1679  extradata += 5;
1680 
1681  *pp += 4;
1682  }
1683 
1684  language[i * 4 - 1] = 0;
1685  av_dict_set(&st->metadata, "language", language, 0);
1686  }
1687  }
1688  break;
1689  case 0x0a: /* ISO 639 language descriptor */
1690  for (i = 0; i + 4 <= desc_len; i += 4) {
1691  language[i + 0] = get8(pp, desc_end);
1692  language[i + 1] = get8(pp, desc_end);
1693  language[i + 2] = get8(pp, desc_end);
1694  language[i + 3] = ',';
1695  switch (get8(pp, desc_end)) {
1696  case 0x01:
1698  break;
1699  case 0x02:
1701  break;
1702  case 0x03:
1704  break;
1705  }
1706  }
1707  if (i && language[0]) {
1708  language[i - 1] = 0;
1709  av_dict_set(&st->metadata, "language", language, 0);
1710  }
1711  break;
1712  case 0x05: /* registration descriptor */
1713  st->codec->codec_tag = bytestream_get_le32(pp);
1714  av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1715  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1716  mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1717  break;
1718  case 0x52: /* stream identifier descriptor */
1719  st->stream_identifier = 1 + get8(pp, desc_end);
1720  break;
1721  case 0x26: /* metadata descriptor */
1722  if (get16(pp, desc_end) == 0xFFFF)
1723  *pp += 4;
1724  if (get8(pp, desc_end) == 0xFF) {
1725  st->codec->codec_tag = bytestream_get_le32(pp);
1726  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1727  mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1728  }
1729  break;
1730  case 0x7f: /* DVB extension descriptor */
1731  ext_desc_tag = get8(pp, desc_end);
1732  if (ext_desc_tag < 0)
1733  return AVERROR_INVALIDDATA;
1734  if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1735  ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1736  if (!st->codec->extradata) {
1739  if (!st->codec->extradata)
1740  return AVERROR(ENOMEM);
1741 
1744 
1745  channel_config_code = get8(pp, desc_end);
1746  if (channel_config_code < 0)
1747  return AVERROR_INVALIDDATA;
1748  if (channel_config_code <= 0x8) {
1749  st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1750  st->codec->extradata[18] = channels > 2;
1751  st->codec->extradata[19] = channel_config_code;
1752  if (channel_config_code == 0) { /* Dual Mono */
1753  st->codec->extradata[18] = 255; /* Mapping */
1754  st->codec->extradata[19] = 2; /* Stream Count */
1755  }
1756  st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1757  memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1758  } else {
1759  avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1760  }
1762  }
1763  }
1764  break;
1765  default:
1766  break;
1767  }
1768  *pp = desc_end;
1769  return 0;
1770 }
1771 
1772 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1773 {
1774  MpegTSContext *ts = filter->u.section_filter.opaque;
1775  SectionHeader h1, *h = &h1;
1776  PESContext *pes;
1777  AVStream *st;
1778  const uint8_t *p, *p_end, *desc_list_end;
1779  int program_info_length, pcr_pid, pid, stream_type;
1780  int desc_list_len;
1781  uint32_t prog_reg_desc = 0; /* registration descriptor */
1782 
1783  int mp4_descr_count = 0;
1784  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1785  int i;
1786 
1787  av_dlog(ts->stream, "PMT: len %i\n", section_len);
1788  hex_dump_debug(ts->stream, section, section_len);
1789 
1790  p_end = section + section_len - 4;
1791  p = section;
1792  if (parse_section_header(h, &p, p_end) < 0)
1793  return;
1794 
1795  av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1796  h->id, h->sec_num, h->last_sec_num);
1797 
1798  if (h->tid != PMT_TID)
1799  return;
1800  if (ts->skip_changes)
1801  return;
1802 
1803  clear_program(ts, h->id);
1804  pcr_pid = get16(&p, p_end);
1805  if (pcr_pid < 0)
1806  return;
1807  pcr_pid &= 0x1fff;
1808  add_pid_to_pmt(ts, h->id, pcr_pid);
1809  set_pcr_pid(ts->stream, h->id, pcr_pid);
1810 
1811  av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1812 
1813  program_info_length = get16(&p, p_end);
1814  if (program_info_length < 0)
1815  return;
1816  program_info_length &= 0xfff;
1817  while (program_info_length >= 2) {
1818  uint8_t tag, len;
1819  tag = get8(&p, p_end);
1820  len = get8(&p, p_end);
1821 
1822  av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1823 
1824  if (len > program_info_length - 2)
1825  // something else is broken, exit the program_descriptors_loop
1826  break;
1827  program_info_length -= len + 2;
1828  if (tag == 0x1d) { // IOD descriptor
1829  get8(&p, p_end); // scope
1830  get8(&p, p_end); // label
1831  len -= 2;
1832  mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1833  &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1834  } else if (tag == 0x05 && len >= 4) { // registration descriptor
1835  prog_reg_desc = bytestream_get_le32(&p);
1836  len -= 4;
1837  }
1838  p += len;
1839  }
1840  p += program_info_length;
1841  if (p >= p_end)
1842  goto out;
1843 
1844  // stop parsing after pmt, we found header
1845  if (!ts->stream->nb_streams)
1846  ts->stop_parse = 2;
1847 
1848  set_pmt_found(ts, h->id);
1849 
1850 
1851  for (;;) {
1852  st = 0;
1853  pes = NULL;
1854  stream_type = get8(&p, p_end);
1855  if (stream_type < 0)
1856  break;
1857  pid = get16(&p, p_end);
1858  if (pid < 0)
1859  goto out;
1860  pid &= 0x1fff;
1861  if (pid == ts->current_pid)
1862  goto out;
1863 
1864  /* now create stream */
1865  if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1866  pes = ts->pids[pid]->u.pes_filter.opaque;
1867  if (!pes->st) {
1868  pes->st = avformat_new_stream(pes->stream, NULL);
1869  if (!pes->st)
1870  goto out;
1871  pes->st->id = pes->pid;
1872  }
1873  st = pes->st;
1874  } else if (stream_type != 0x13) {
1875  if (ts->pids[pid])
1876  mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1877  pes = add_pes_stream(ts, pid, pcr_pid);
1878  if (pes) {
1879  st = avformat_new_stream(pes->stream, NULL);
1880  if (!st)
1881  goto out;
1882  st->id = pes->pid;
1883  }
1884  } else {
1885  int idx = ff_find_stream_index(ts->stream, pid);
1886  if (idx >= 0) {
1887  st = ts->stream->streams[idx];
1888  } else {
1889  st = avformat_new_stream(ts->stream, NULL);
1890  if (!st)
1891  goto out;
1892  st->id = pid;
1894  }
1895  }
1896 
1897  if (!st)
1898  goto out;
1899 
1900  if (pes && !pes->stream_type)
1901  mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1902 
1903  add_pid_to_pmt(ts, h->id, pid);
1904 
1906 
1907  desc_list_len = get16(&p, p_end);
1908  if (desc_list_len < 0)
1909  goto out;
1910  desc_list_len &= 0xfff;
1911  desc_list_end = p + desc_list_len;
1912  if (desc_list_end > p_end)
1913  goto out;
1914  for (;;) {
1915  if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1916  desc_list_end, mp4_descr,
1917  mp4_descr_count, pid, ts) < 0)
1918  break;
1919 
1920  if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1921  stream_type == 0x83 && pes->sub_st) {
1923  pes->sub_st->index);
1924  pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1925  }
1926  }
1927  p = desc_list_end;
1928  }
1929 
1930  if (!ts->pids[pcr_pid])
1931  mpegts_open_pcr_filter(ts, pcr_pid);
1932 
1933 out:
1934  for (i = 0; i < mp4_descr_count; i++)
1935  av_free(mp4_descr[i].dec_config_descr);
1936 }
1937 
1938 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1939 {
1940  MpegTSContext *ts = filter->u.section_filter.opaque;
1941  SectionHeader h1, *h = &h1;
1942  const uint8_t *p, *p_end;
1943  int sid, pmt_pid;
1944  AVProgram *program;
1945 
1946  av_dlog(ts->stream, "PAT:\n");
1947  hex_dump_debug(ts->stream, section, section_len);
1948 
1949  p_end = section + section_len - 4;
1950  p = section;
1951  if (parse_section_header(h, &p, p_end) < 0)
1952  return;
1953  if (h->tid != PAT_TID)
1954  return;
1955  if (ts->skip_changes)
1956  return;
1957 
1958  ts->stream->ts_id = h->id;
1959 
1960  clear_programs(ts);
1961  for (;;) {
1962  sid = get16(&p, p_end);
1963  if (sid < 0)
1964  break;
1965  pmt_pid = get16(&p, p_end);
1966  if (pmt_pid < 0)
1967  break;
1968  pmt_pid &= 0x1fff;
1969 
1970  if (pmt_pid == ts->current_pid)
1971  break;
1972 
1973  av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1974 
1975  if (sid == 0x0000) {
1976  /* NIT info */
1977  } else {
1978  MpegTSFilter *fil = ts->pids[pmt_pid];
1979  program = av_new_program(ts->stream, sid);
1980  if (program) {
1981  program->program_num = sid;
1982  program->pmt_pid = pmt_pid;
1983  }
1984  if (fil)
1985  if ( fil->type != MPEGTS_SECTION
1986  || fil->pid != pmt_pid
1987  || fil->u.section_filter.section_cb != pmt_cb)
1988  mpegts_close_filter(ts, ts->pids[pmt_pid]);
1989 
1990  if (!ts->pids[pmt_pid])
1991  mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1992  add_pat_entry(ts, sid);
1993  add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1994  add_pid_to_pmt(ts, sid, pmt_pid);
1995  }
1996  }
1997 
1998  if (sid < 0) {
1999  int i,j;
2000  for (j=0; j<ts->stream->nb_programs; j++) {
2001  for (i = 0; i < ts->nb_prg; i++)
2002  if (ts->prg[i].id == ts->stream->programs[j]->id)
2003  break;
2004  if (i==ts->nb_prg && !ts->skip_clear)
2005  clear_avprogram(ts, ts->stream->programs[j]->id);
2006  }
2007  }
2008 }
2009 
2010 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2011 {
2012  MpegTSContext *ts = filter->u.section_filter.opaque;
2013  SectionHeader h1, *h = &h1;
2014  const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2015  int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2016  char *name, *provider_name;
2017 
2018  av_dlog(ts->stream, "SDT:\n");
2019  hex_dump_debug(ts->stream, section, section_len);
2020 
2021  p_end = section + section_len - 4;
2022  p = section;
2023  if (parse_section_header(h, &p, p_end) < 0)
2024  return;
2025  if (h->tid != SDT_TID)
2026  return;
2027  if (ts->skip_changes)
2028  return;
2029  onid = get16(&p, p_end);
2030  if (onid < 0)
2031  return;
2032  val = get8(&p, p_end);
2033  if (val < 0)
2034  return;
2035  for (;;) {
2036  sid = get16(&p, p_end);
2037  if (sid < 0)
2038  break;
2039  val = get8(&p, p_end);
2040  if (val < 0)
2041  break;
2042  desc_list_len = get16(&p, p_end);
2043  if (desc_list_len < 0)
2044  break;
2045  desc_list_len &= 0xfff;
2046  desc_list_end = p + desc_list_len;
2047  if (desc_list_end > p_end)
2048  break;
2049  for (;;) {
2050  desc_tag = get8(&p, desc_list_end);
2051  if (desc_tag < 0)
2052  break;
2053  desc_len = get8(&p, desc_list_end);
2054  desc_end = p + desc_len;
2055  if (desc_len < 0 || desc_end > desc_list_end)
2056  break;
2057 
2058  av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
2059  desc_tag, desc_len);
2060 
2061  switch (desc_tag) {
2062  case 0x48:
2063  service_type = get8(&p, p_end);
2064  if (service_type < 0)
2065  break;
2066  provider_name = getstr8(&p, p_end);
2067  if (!provider_name)
2068  break;
2069  name = getstr8(&p, p_end);
2070  if (name) {
2071  AVProgram *program = av_new_program(ts->stream, sid);
2072  if (program) {
2073  av_dict_set(&program->metadata, "service_name", name, 0);
2074  av_dict_set(&program->metadata, "service_provider",
2075  provider_name, 0);
2076  }
2077  }
2078  av_free(name);
2079  av_free(provider_name);
2080  break;
2081  default:
2082  break;
2083  }
2084  p = desc_end;
2085  }
2086  p = desc_list_end;
2087  }
2088 }
2089 
2090 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2091  const uint8_t *packet);
2092 
2093 /* handle one TS packet */
2094 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2095 {
2096  MpegTSFilter *tss;
2097  int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2098  has_adaptation, has_payload;
2099  const uint8_t *p, *p_end;
2100  int64_t pos;
2101 
2102  pid = AV_RB16(packet + 1) & 0x1fff;
2103  if (pid && discard_pid(ts, pid))
2104  return 0;
2105  is_start = packet[1] & 0x40;
2106  tss = ts->pids[pid];
2107  if (ts->auto_guess && !tss && is_start) {
2108  add_pes_stream(ts, pid, -1);
2109  tss = ts->pids[pid];
2110  }
2111  if (!tss)
2112  return 0;
2113  ts->current_pid = pid;
2114 
2115  afc = (packet[3] >> 4) & 3;
2116  if (afc == 0) /* reserved value */
2117  return 0;
2118  has_adaptation = afc & 2;
2119  has_payload = afc & 1;
2120  is_discontinuity = has_adaptation &&
2121  packet[4] != 0 && /* with length > 0 */
2122  (packet[5] & 0x80); /* and discontinuity indicated */
2123 
2124  /* continuity check (currently not used) */
2125  cc = (packet[3] & 0xf);
2126  expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2127  cc_ok = pid == 0x1FFF || // null packet PID
2128  is_discontinuity ||
2129  tss->last_cc < 0 ||
2130  expected_cc == cc;
2131 
2132  tss->last_cc = cc;
2133  if (!cc_ok) {
2134  av_log(ts->stream, AV_LOG_DEBUG,
2135  "Continuity check failed for pid %d expected %d got %d\n",
2136  pid, expected_cc, cc);
2137  if (tss->type == MPEGTS_PES) {
2138  PESContext *pc = tss->u.pes_filter.opaque;
2139  pc->flags |= AV_PKT_FLAG_CORRUPT;
2140  }
2141  }
2142 
2143  p = packet + 4;
2144  if (has_adaptation) {
2145  int64_t pcr_h;
2146  int pcr_l;
2147  if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2148  tss->last_pcr = pcr_h * 300 + pcr_l;
2149  /* skip adaptation field */
2150  p += p[0] + 1;
2151  }
2152  /* if past the end of packet, ignore */
2153  p_end = packet + TS_PACKET_SIZE;
2154  if (p >= p_end || !has_payload)
2155  return 0;
2156 
2157  pos = avio_tell(ts->stream->pb);
2158  if (pos >= 0) {
2159  av_assert0(pos >= TS_PACKET_SIZE);
2160  ts->pos47_full = pos - TS_PACKET_SIZE;
2161  }
2162 
2163  if (tss->type == MPEGTS_SECTION) {
2164  if (is_start) {
2165  /* pointer field present */
2166  len = *p++;
2167  if (p + len > p_end)
2168  return 0;
2169  if (len && cc_ok) {
2170  /* write remaining section bytes */
2171  write_section_data(ts, tss,
2172  p, len, 0);
2173  /* check whether filter has been closed */
2174  if (!ts->pids[pid])
2175  return 0;
2176  }
2177  p += len;
2178  if (p < p_end) {
2179  write_section_data(ts, tss,
2180  p, p_end - p, 1);
2181  }
2182  } else {
2183  if (cc_ok) {
2184  write_section_data(ts, tss,
2185  p, p_end - p, 0);
2186  }
2187  }
2188 
2189  // stop find_stream_info from waiting for more streams
2190  // when all programs have received a PMT
2191  if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2192  int i;
2193  for (i = 0; i < ts->nb_prg; i++) {
2194  if (!ts->prg[i].pmt_found)
2195  break;
2196  }
2197  if (i == ts->nb_prg && ts->nb_prg > 0) {
2198  if (ts->stream->nb_streams > 1 || pos > 100000) {
2199  av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2201  }
2202  }
2203  }
2204 
2205  } else {
2206  int ret;
2207  // Note: The position here points actually behind the current packet.
2208  if (tss->type == MPEGTS_PES) {
2209  if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2210  pos - ts->raw_packet_size)) < 0)
2211  return ret;
2212  }
2213  }
2214 
2215  return 0;
2216 }
2217 
2218 static void reanalyze(MpegTSContext *ts) {
2219  AVIOContext *pb = ts->stream->pb;
2220  int64_t pos = avio_tell(pb);
2221  if (pos < 0)
2222  return;
2223  pos -= ts->pos47_full;
2224  if (pos == TS_PACKET_SIZE) {
2225  ts->size_stat[0] ++;
2226  } else if (pos == TS_DVHS_PACKET_SIZE) {
2227  ts->size_stat[1] ++;
2228  } else if (pos == TS_FEC_PACKET_SIZE) {
2229  ts->size_stat[2] ++;
2230  }
2231 
2232  ts->size_stat_count ++;
2234  int newsize = 0;
2235  if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2236  newsize = TS_PACKET_SIZE;
2237  } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2238  newsize = TS_DVHS_PACKET_SIZE;
2239  } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2240  newsize = TS_FEC_PACKET_SIZE;
2241  }
2242  if (newsize && newsize != ts->raw_packet_size) {
2243  av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2244  ts->raw_packet_size = newsize;
2245  }
2246  ts->size_stat_count = 0;
2247  memset(ts->size_stat, 0, sizeof(ts->size_stat));
2248  }
2249 }
2250 
2251 /* XXX: try to find a better synchro over several packets (use
2252  * get_packet_size() ?) */
2254 {
2255  MpegTSContext *ts = s->priv_data;
2256  AVIOContext *pb = s->pb;
2257  int c, i;
2258 
2259  for (i = 0; i < ts->resync_size; i++) {
2260  c = avio_r8(pb);
2261  if (avio_feof(pb))
2262  return AVERROR_EOF;
2263  if (c == 0x47) {
2264  avio_seek(pb, -1, SEEK_CUR);
2265  reanalyze(s->priv_data);
2266  return 0;
2267  }
2268  }
2269  av_log(s, AV_LOG_ERROR,
2270  "max resync size reached, could not find sync byte\n");
2271  /* no sync found */
2272  return AVERROR_INVALIDDATA;
2273 }
2274 
2275 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2276 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2277  const uint8_t **data)
2278 {
2279  AVIOContext *pb = s->pb;
2280  int len;
2281 
2282  for (;;) {
2283  len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2284  if (len != TS_PACKET_SIZE)
2285  return len < 0 ? len : AVERROR_EOF;
2286  /* check packet sync byte */
2287  if ((*data)[0] != 0x47) {
2288  /* find a new packet start */
2289  uint64_t pos = avio_tell(pb);
2290  avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2291 
2292  if (mpegts_resync(s) < 0)
2293  return AVERROR(EAGAIN);
2294  else
2295  continue;
2296  } else {
2297  break;
2298  }
2299  }
2300  return 0;
2301 }
2302 
2303 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2304 {
2305  AVIOContext *pb = s->pb;
2306  int skip = raw_packet_size - TS_PACKET_SIZE;
2307  if (skip > 0)
2308  avio_skip(pb, skip);
2309 }
2310 
2311 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2312 {
2313  AVFormatContext *s = ts->stream;
2315  const uint8_t *data;
2316  int64_t packet_num;
2317  int ret = 0;
2318 
2319  if (avio_tell(s->pb) != ts->last_pos) {
2320  int i;
2321  av_dlog(ts->stream, "Skipping after seek\n");
2322  /* seek detected, flush pes buffer */
2323  for (i = 0; i < NB_PID_MAX; i++) {
2324  if (ts->pids[i]) {
2325  if (ts->pids[i]->type == MPEGTS_PES) {
2326  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2327  av_buffer_unref(&pes->buffer);
2328  pes->data_index = 0;
2329  pes->state = MPEGTS_SKIP; /* skip until pes header */
2330  }
2331  ts->pids[i]->last_cc = -1;
2332  ts->pids[i]->last_pcr = -1;
2333  }
2334  }
2335  }
2336 
2337  ts->stop_parse = 0;
2338  packet_num = 0;
2339  memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2340  for (;;) {
2341  packet_num++;
2342  if (nb_packets != 0 && packet_num >= nb_packets ||
2343  ts->stop_parse > 1) {
2344  ret = AVERROR(EAGAIN);
2345  break;
2346  }
2347  if (ts->stop_parse > 0)
2348  break;
2349 
2350  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2351  if (ret != 0)
2352  break;
2353  ret = handle_packet(ts, data);
2355  if (ret != 0)
2356  break;
2357  }
2358  ts->last_pos = avio_tell(s->pb);
2359  return ret;
2360 }
2361 
2363 {
2364  const int size = p->buf_size;
2365  int maxscore = 0;
2366  int sumscore = 0;
2367  int i;
2368  int check_count = size / TS_FEC_PACKET_SIZE;
2369 #define CHECK_COUNT 10
2370 #define CHECK_BLOCK 100
2371 
2372  if (check_count < CHECK_COUNT)
2373  return AVERROR_INVALIDDATA;
2374 
2375  for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2376  int left = FFMIN(check_count - i, CHECK_BLOCK);
2377  int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2378  int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2379  int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2380  score = FFMAX3(score, dvhs_score, fec_score);
2381  sumscore += score;
2382  maxscore = FFMAX(maxscore, score);
2383  }
2384 
2385  sumscore = sumscore * CHECK_COUNT / check_count;
2386  maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2387 
2388  av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2389 
2390  if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2391  else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2392  else
2393  return AVERROR_INVALIDDATA;
2394 }
2395 
2396 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2397  * (-1) if not available */
2398 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2399 {
2400  int afc, len, flags;
2401  const uint8_t *p;
2402  unsigned int v;
2403 
2404  afc = (packet[3] >> 4) & 3;
2405  if (afc <= 1)
2406  return AVERROR_INVALIDDATA;
2407  p = packet + 4;
2408  len = p[0];
2409  p++;
2410  if (len == 0)
2411  return AVERROR_INVALIDDATA;
2412  flags = *p++;
2413  len--;
2414  if (!(flags & 0x10))
2415  return AVERROR_INVALIDDATA;
2416  if (len < 6)
2417  return AVERROR_INVALIDDATA;
2418  v = AV_RB32(p);
2419  *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2420  *ppcr_low = ((p[4] & 1) << 8) | p[5];
2421  return 0;
2422 }
2423 
2424 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2425 
2426  /* NOTE: We attempt to seek on non-seekable files as well, as the
2427  * probe buffer usually is big enough. Only warn if the seek failed
2428  * on files where the seek should work. */
2429  if (avio_seek(pb, pos, SEEK_SET) < 0)
2430  av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2431 }
2432 
2434 {
2435  MpegTSContext *ts = s->priv_data;
2436  AVIOContext *pb = s->pb;
2437  uint8_t buf[8 * 1024] = {0};
2438  int len;
2439  int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2440 
2441  ffio_ensure_seekback(pb, probesize);
2442 
2443  /* read the first 8192 bytes to get packet size */
2444  pos = avio_tell(pb);
2445  len = avio_read(pb, buf, sizeof(buf));
2446  ts->raw_packet_size = get_packet_size(buf, len);
2447  if (ts->raw_packet_size <= 0) {
2448  av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2450  }
2451  ts->stream = s;
2452  ts->auto_guess = 0;
2453 
2454  if (s->iformat == &ff_mpegts_demuxer) {
2455  /* normal demux */
2456 
2457  /* first do a scan to get all the services */
2458  seek_back(s, pb, pos);
2459 
2461 
2463 
2464  handle_packets(ts, probesize / ts->raw_packet_size);
2465  /* if could not find service, enable auto_guess */
2466 
2467  ts->auto_guess = 1;
2468 
2469  av_dlog(ts->stream, "tuning done\n");
2470 
2472  } else {
2473  AVStream *st;
2474  int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2475  int64_t pcrs[2], pcr_h;
2476  int packet_count[2];
2477  uint8_t packet[TS_PACKET_SIZE];
2478  const uint8_t *data;
2479 
2480  /* only read packets */
2481 
2482  st = avformat_new_stream(s, NULL);
2483  if (!st)
2484  return AVERROR(ENOMEM);
2485  avpriv_set_pts_info(st, 60, 1, 27000000);
2488 
2489  /* we iterate until we find two PCRs to estimate the bitrate */
2490  pcr_pid = -1;
2491  nb_pcrs = 0;
2492  nb_packets = 0;
2493  for (;;) {
2494  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2495  if (ret < 0)
2496  return ret;
2497  pid = AV_RB16(data + 1) & 0x1fff;
2498  if ((pcr_pid == -1 || pcr_pid == pid) &&
2499  parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2501  pcr_pid = pid;
2502  packet_count[nb_pcrs] = nb_packets;
2503  pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2504  nb_pcrs++;
2505  if (nb_pcrs >= 2)
2506  break;
2507  } else {
2509  }
2510  nb_packets++;
2511  }
2512 
2513  /* NOTE1: the bitrate is computed without the FEC */
2514  /* NOTE2: it is only the bitrate of the start of the stream */
2515  ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2516  ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2517  s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2518  st->codec->bit_rate = s->bit_rate;
2519  st->start_time = ts->cur_pcr;
2520  av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2521  st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2522  }
2523 
2524  seek_back(s, pb, pos);
2525  return 0;
2526 }
2527 
2528 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2529 
2531 {
2532  MpegTSContext *ts = s->priv_data;
2533  int ret, i;
2534  int64_t pcr_h, next_pcr_h, pos;
2535  int pcr_l, next_pcr_l;
2536  uint8_t pcr_buf[12];
2537  const uint8_t *data;
2538 
2539  if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2540  return AVERROR(ENOMEM);
2541  ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2542  pkt->pos = avio_tell(s->pb);
2543  if (ret < 0) {
2544  av_free_packet(pkt);
2545  return ret;
2546  }
2547  if (data != pkt->data)
2548  memcpy(pkt->data, data, ts->raw_packet_size);
2550  if (ts->mpeg2ts_compute_pcr) {
2551  /* compute exact PCR for each packet */
2552  if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2553  /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2554  pos = avio_tell(s->pb);
2555  for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2556  avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2557  avio_read(s->pb, pcr_buf, 12);
2558  if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2559  /* XXX: not precise enough */
2560  ts->pcr_incr =
2561  ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2562  (i + 1);
2563  break;
2564  }
2565  }
2566  avio_seek(s->pb, pos, SEEK_SET);
2567  /* no next PCR found: we use previous increment */
2568  ts->cur_pcr = pcr_h * 300 + pcr_l;
2569  }
2570  pkt->pts = ts->cur_pcr;
2571  pkt->duration = ts->pcr_incr;
2572  ts->cur_pcr += ts->pcr_incr;
2573  }
2574  pkt->stream_index = 0;
2575  return 0;
2576 }
2577 
2579 {
2580  MpegTSContext *ts = s->priv_data;
2581  int ret, i;
2582 
2583  pkt->size = -1;
2584  ts->pkt = pkt;
2585  ret = handle_packets(ts, 0);
2586  if (ret < 0) {
2587  av_free_packet(ts->pkt);
2588  /* flush pes data left */
2589  for (i = 0; i < NB_PID_MAX; i++)
2590  if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2591  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2592  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2593  new_pes_packet(pes, pkt);
2594  pes->state = MPEGTS_SKIP;
2595  ret = 0;
2596  break;
2597  }
2598  }
2599  }
2600 
2601  if (!ret && pkt->size < 0)
2602  ret = AVERROR(EINTR);
2603  return ret;
2604 }
2605 
2606 static void mpegts_free(MpegTSContext *ts)
2607 {
2608  int i;
2609 
2610  clear_programs(ts);
2611 
2612  for (i = 0; i < NB_PID_MAX; i++)
2613  if (ts->pids[i])
2614  mpegts_close_filter(ts, ts->pids[i]);
2615 }
2616 
2618 {
2619  MpegTSContext *ts = s->priv_data;
2620  mpegts_free(ts);
2621  return 0;
2622 }
2623 
2624 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2625  int64_t *ppos, int64_t pos_limit)
2626 {
2627  MpegTSContext *ts = s->priv_data;
2628  int64_t pos, timestamp;
2630  int pcr_l, pcr_pid =
2631  ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2632  int pos47 = ts->pos47_full % ts->raw_packet_size;
2633  pos =
2634  ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2635  ts->raw_packet_size + pos47;
2636  while(pos < pos_limit) {
2637  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2638  return AV_NOPTS_VALUE;
2639  if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2640  return AV_NOPTS_VALUE;
2641  if (buf[0] != 0x47) {
2642  avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2643  if (mpegts_resync(s) < 0)
2644  return AV_NOPTS_VALUE;
2645  pos = avio_tell(s->pb);
2646  continue;
2647  }
2648  if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2649  parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2650  *ppos = pos;
2651  return timestamp;
2652  }
2653  pos += ts->raw_packet_size;
2654  }
2655 
2656  return AV_NOPTS_VALUE;
2657 }
2658 
2659 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2660  int64_t *ppos, int64_t pos_limit)
2661 {
2662  MpegTSContext *ts = s->priv_data;
2663  int64_t pos;
2664  int pos47 = ts->pos47_full % ts->raw_packet_size;
2665  pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2667  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2668  return AV_NOPTS_VALUE;
2669  while(pos < pos_limit) {
2670  int ret;
2671  AVPacket pkt;
2672  av_init_packet(&pkt);
2673  ret = av_read_frame(s, &pkt);
2674  if (ret < 0)
2675  return AV_NOPTS_VALUE;
2676  av_free_packet(&pkt);
2677  if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2678  ff_reduce_index(s, pkt.stream_index);
2679  av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2680  if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2681  *ppos = pkt.pos;
2682  return pkt.dts;
2683  }
2684  }
2685  pos = pkt.pos;
2686  }
2687 
2688  return AV_NOPTS_VALUE;
2689 }
2690 
2691 /**************************************************************/
2692 /* parsing functions - called from other demuxers such as RTP */
2693 
2695 {
2696  MpegTSContext *ts;
2697 
2698  ts = av_mallocz(sizeof(MpegTSContext));
2699  if (!ts)
2700  return NULL;
2701  /* no stream case, currently used by RTP */
2703  ts->stream = s;
2704  ts->auto_guess = 1;
2707 
2708  return ts;
2709 }
2710 
2711 /* return the consumed length if a packet was output, or -1 if no
2712  * packet is output */
2714  const uint8_t *buf, int len)
2715 {
2716  int len1;
2717 
2718  len1 = len;
2719  ts->pkt = pkt;
2720  for (;;) {
2721  ts->stop_parse = 0;
2722  if (len < TS_PACKET_SIZE)
2723  return AVERROR_INVALIDDATA;
2724  if (buf[0] != 0x47) {
2725  buf++;
2726  len--;
2727  } else {
2728  handle_packet(ts, buf);
2729  buf += TS_PACKET_SIZE;
2730  len -= TS_PACKET_SIZE;
2731  if (ts->stop_parse == 1)
2732  break;
2733  }
2734  }
2735  return len1 - len;
2736 }
2737 
2739 {
2740  mpegts_free(ts);
2741  av_free(ts);
2742 }
2743 
2744 AVInputFormat ff_mpegts_demuxer = {
2745  .name = "mpegts",
2746  .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2747  .priv_data_size = sizeof(MpegTSContext),
2752  .read_timestamp = mpegts_get_dts,
2754  .priv_class = &mpegts_class,
2755 };
2756 
2758  .name = "mpegtsraw",
2759  .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2760  .priv_data_size = sizeof(MpegTSContext),
2764  .read_timestamp = mpegts_get_dts,
2766  .priv_class = &mpegtsraw_class,
2767 };