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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 "avformat.h"
33 #include "mpegts.h"
34 #include "internal.h"
35 #include "avio_internal.h"
36 #include "seek.h"
37 #include "mpeg.h"
38 #include "isom.h"
39 
40 /* maximum size in which we look for synchronisation if
41  * synchronisation is lost */
42 #define MAX_RESYNC_SIZE 65536
43 
44 #define MAX_PES_PAYLOAD 200 * 1024
45 
46 #define MAX_MP4_DESCR_COUNT 16
47 
48 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
49  do { \
50  if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
51  (modulus) = (dividend) % (divisor); \
52  (prev_dividend) = (dividend); \
53  } while (0)
54 
59 };
60 
61 typedef struct MpegTSFilter MpegTSFilter;
62 
63 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
64  int is_start, int64_t pos);
65 
66 typedef struct MpegTSPESFilter {
68  void *opaque;
70 
71 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
72 
73 typedef void SetServiceCallback (void *opaque, int ret);
74 
75 typedef struct MpegTSSectionFilter {
79  unsigned int check_crc : 1;
80  unsigned int end_of_section_reached : 1;
82  void *opaque;
84 
85 struct MpegTSFilter {
86  int pid;
87  int es_id;
88  int last_cc; /* last cc code (-1 if first packet) */
89  int64_t last_pcr;
91  union {
94  } u;
95 };
96 
97 #define MAX_PIDS_PER_PROGRAM 64
98 struct Program {
99  unsigned int id; // program id/service id
100  unsigned int nb_pids;
101  unsigned int pids[MAX_PIDS_PER_PROGRAM];
102 
103  /** have we found pmt for this program */
105 };
106 
108  const AVClass *class;
109  /* user data */
111  /** raw packet size, including FEC if present */
113 
114  int size_stat[3];
116 #define SIZE_STAT_THRESHOLD 10
117 
118  int64_t pos47_full;
119 
120  /** if true, all pids are analyzed to find streams */
122 
123  /** compute exact PCR for each transport stream packet */
125 
126  /** fix dvb teletext pts */
128 
129  int64_t cur_pcr; /**< used to estimate the exact PCR */
130  int pcr_incr; /**< used to estimate the exact PCR */
131 
132  /* data needed to handle file based ts */
133  /** stop parsing loop */
135  /** packet containing Audio/Video data */
137  /** to detect seek */
138  int64_t last_pos;
139 
142 
143  /******************************************/
144  /* private mpegts data */
145  /* scan context */
146  /** structure to keep track of Program->pids mapping */
147  unsigned int nb_prg;
148  struct Program *prg;
149 
151  /** filters for various streams specified by PMT + for the PAT and PMT */
154 };
155 
156 static const AVOption mpegtsraw_options[] = {
157  { "compute_pcr", "Compute exact PCR for each transport stream packet.",
158  offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
159  { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
160  { "ts_packetsize", "Output option carrying the raw packet size.",
161  offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
162  { .i64 = 0 }, 0, 0,
164  { NULL },
165 };
166 
167 static const AVClass mpegtsraw_class = {
168  .class_name = "mpegtsraw demuxer",
169  .item_name = av_default_item_name,
170  .option = mpegtsraw_options,
171  .version = LIBAVUTIL_VERSION_INT,
172 };
173 
174 static const AVOption mpegts_options[] = {
175  {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
176  {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
177  {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
179  {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
180  {.i64 = 0}, 0, 1, 0 },
181  {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
182  {.i64 = 0}, 0, 1, 0 },
183  { NULL },
184 };
185 
186 static const AVClass mpegts_class = {
187  .class_name = "mpegts demuxer",
188  .item_name = av_default_item_name,
189  .option = mpegts_options,
190  .version = LIBAVUTIL_VERSION_INT,
191 };
192 
193 /* TS stream handling */
194 
201 };
202 
203 /* enough for PES header + length */
204 #define PES_START_SIZE 6
205 #define PES_HEADER_SIZE 9
206 #define MAX_PES_HEADER_SIZE (9 + 255)
207 
208 typedef struct PESContext {
209  int pid;
210  int pcr_pid; /**< if -1 then all packets containing PCR are considered */
215  AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
217  /* used to get the format */
219  int flags; /**< copied to the AVPacket flags */
223  int64_t pts, dts;
224  int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
228 } PESContext;
229 
231 
232 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
233 {
234  int i;
235  for (i = 0; i < ts->nb_prg; i++) {
236  if (ts->prg[i].id == programid) {
237  return &ts->prg[i];
238  }
239  }
240  return NULL;
241 }
242 
243 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
244 {
245  AVProgram *prg = NULL;
246  int i;
247 
248  for (i = 0; i < ts->stream->nb_programs; i++)
249  if (ts->stream->programs[i]->id == programid) {
250  prg = ts->stream->programs[i];
251  break;
252  }
253  if (!prg)
254  return;
255  prg->nb_stream_indexes = 0;
256 }
257 
258 static void clear_program(MpegTSContext *ts, unsigned int programid)
259 {
260  int i;
261 
262  clear_avprogram(ts, programid);
263  for (i = 0; i < ts->nb_prg; i++)
264  if (ts->prg[i].id == programid) {
265  ts->prg[i].nb_pids = 0;
266  ts->prg[i].pmt_found = 0;
267  }
268 }
269 
271 {
272  av_freep(&ts->prg);
273  ts->nb_prg = 0;
274 }
275 
276 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
277 {
278  struct Program *p;
279  if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
280  ts->nb_prg = 0;
281  return;
282  }
283  p = &ts->prg[ts->nb_prg];
284  p->id = programid;
285  p->nb_pids = 0;
286  p->pmt_found = 0;
287  ts->nb_prg++;
288 }
289 
290 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
291  unsigned int pid)
292 {
293  struct Program *p = get_program(ts, programid);
294  if (!p)
295  return;
296 
297  if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
298  return;
299  p->pids[p->nb_pids++] = pid;
300 }
301 
302 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
303 {
304  struct Program *p = get_program(ts, programid);
305  if (!p)
306  return;
307 
308  p->pmt_found = 1;
309 }
310 
311 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
312 {
313  int i;
314  for (i = 0; i < s->nb_programs; i++) {
315  if (s->programs[i]->id == programid) {
316  s->programs[i]->pcr_pid = pid;
317  break;
318  }
319  }
320 }
321 
322 /**
323  * @brief discard_pid() decides if the pid is to be discarded according
324  * to caller's programs selection
325  * @param ts : - TS context
326  * @param pid : - pid
327  * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
328  * 0 otherwise
329  */
330 static int discard_pid(MpegTSContext *ts, unsigned int pid)
331 {
332  int i, j, k;
333  int used = 0, discarded = 0;
334  struct Program *p;
335 
336  /* If none of the programs have .discard=AVDISCARD_ALL then there's
337  * no way we have to discard this packet */
338  for (k = 0; k < ts->stream->nb_programs; k++)
339  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
340  break;
341  if (k == ts->stream->nb_programs)
342  return 0;
343 
344  for (i = 0; i < ts->nb_prg; i++) {
345  p = &ts->prg[i];
346  for (j = 0; j < p->nb_pids; j++) {
347  if (p->pids[j] != pid)
348  continue;
349  // is program with id p->id set to be discarded?
350  for (k = 0; k < ts->stream->nb_programs; k++) {
351  if (ts->stream->programs[k]->id == p->id) {
352  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
353  discarded++;
354  else
355  used++;
356  }
357  }
358  }
359  }
360 
361  return !used && discarded;
362 }
363 
364 /**
365  * Assemble PES packets out of TS packets, and then call the "section_cb"
366  * function when they are complete.
367  */
369  const uint8_t *buf, int buf_size, int is_start)
370 {
371  MpegTSSectionFilter *tss = &tss1->u.section_filter;
372  int len;
373 
374  if (is_start) {
375  memcpy(tss->section_buf, buf, buf_size);
376  tss->section_index = buf_size;
377  tss->section_h_size = -1;
378  tss->end_of_section_reached = 0;
379  } else {
380  if (tss->end_of_section_reached)
381  return;
382  len = 4096 - tss->section_index;
383  if (buf_size < len)
384  len = buf_size;
385  memcpy(tss->section_buf + tss->section_index, buf, len);
386  tss->section_index += len;
387  }
388 
389  /* compute section length if possible */
390  if (tss->section_h_size == -1 && tss->section_index >= 3) {
391  len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
392  if (len > 4096)
393  return;
394  tss->section_h_size = len;
395  }
396 
397  if (tss->section_h_size != -1 &&
398  tss->section_index >= tss->section_h_size) {
399  int crc_valid = 1;
400  tss->end_of_section_reached = 1;
401 
402  if (tss->check_crc) {
403  crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
404  if (crc_valid) {
405  ts->crc_validity[ tss1->pid ] = 100;
406  }else if (ts->crc_validity[ tss1->pid ] > -10) {
407  ts->crc_validity[ tss1->pid ]--;
408  }else
409  crc_valid = 2;
410  }
411  if (crc_valid)
412  tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
413  }
414 }
415 
416 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
417  enum MpegTSFilterType type)
418 {
420 
421  av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
422 
423  if (pid >= NB_PID_MAX || ts->pids[pid])
424  return NULL;
425  filter = av_mallocz(sizeof(MpegTSFilter));
426  if (!filter)
427  return NULL;
428  ts->pids[pid] = filter;
429 
430  filter->type = type;
431  filter->pid = pid;
432  filter->es_id = -1;
433  filter->last_cc = -1;
434  filter->last_pcr= -1;
435 
436  return filter;
437 }
438 
440  unsigned int pid,
441  SectionCallback *section_cb,
442  void *opaque,
443  int check_crc)
444 {
446  MpegTSSectionFilter *sec;
447 
448  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
449  return NULL;
450  sec = &filter->u.section_filter;
451  sec->section_cb = section_cb;
452  sec->opaque = opaque;
454  sec->check_crc = check_crc;
455  if (!sec->section_buf) {
456  av_free(filter);
457  return NULL;
458  }
459  return filter;
460 }
461 
462 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
463  PESCallback *pes_cb,
464  void *opaque)
465 {
467  MpegTSPESFilter *pes;
468 
469  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
470  return NULL;
471 
472  pes = &filter->u.pes_filter;
473  pes->pes_cb = pes_cb;
474  pes->opaque = opaque;
475  return filter;
476 }
477 
478 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
479 {
480  return mpegts_open_filter(ts, pid, MPEGTS_PCR);
481 }
482 
484 {
485  int pid;
486 
487  pid = filter->pid;
488  if (filter->type == MPEGTS_SECTION)
490  else if (filter->type == MPEGTS_PES) {
491  PESContext *pes = filter->u.pes_filter.opaque;
492  av_buffer_unref(&pes->buffer);
493  /* referenced private data will be freed later in
494  * avformat_close_input */
495  if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
496  av_freep(&filter->u.pes_filter.opaque);
497  }
498  }
499 
500  av_free(filter);
501  ts->pids[pid] = NULL;
502 }
503 
504 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
505 {
506  int stat[TS_MAX_PACKET_SIZE];
507  int i;
508  int best_score = 0;
509  int best_score2 = 0;
510 
511  memset(stat, 0, packet_size * sizeof(*stat));
512 
513  for (i = 0; i < size - 3; i++) {
514  if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
515  int x = i % packet_size;
516  stat[x]++;
517  if (stat[x] > best_score) {
518  best_score = stat[x];
519  if (index)
520  *index = x;
521  } else if (stat[x] > best_score2) {
522  best_score2 = stat[x];
523  }
524  }
525  }
526 
527  return best_score - best_score2;
528 }
529 
530 /* autodetect fec presence. Must have at least 1024 bytes */
531 static int get_packet_size(const uint8_t *buf, int size)
532 {
533  int score, fec_score, dvhs_score;
534 
535  if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
536  return AVERROR_INVALIDDATA;
537 
538  score = analyze(buf, size, TS_PACKET_SIZE, NULL);
539  dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
540  fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
541  av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
542  score, dvhs_score, fec_score);
543 
544  if (score > fec_score && score > dvhs_score)
545  return TS_PACKET_SIZE;
546  else if (dvhs_score > score && dvhs_score > fec_score)
547  return TS_DVHS_PACKET_SIZE;
548  else if (score < fec_score && dvhs_score < fec_score)
549  return TS_FEC_PACKET_SIZE;
550  else
551  return AVERROR_INVALIDDATA;
552 }
553 
554 typedef struct SectionHeader {
556  uint16_t id;
560 } SectionHeader;
561 
562 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
563 {
564  const uint8_t *p;
565  int c;
566 
567  p = *pp;
568  if (p >= p_end)
569  return AVERROR_INVALIDDATA;
570  c = *p++;
571  *pp = p;
572  return c;
573 }
574 
575 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
576 {
577  const uint8_t *p;
578  int c;
579 
580  p = *pp;
581  if ((p + 1) >= p_end)
582  return AVERROR_INVALIDDATA;
583  c = AV_RB16(p);
584  p += 2;
585  *pp = p;
586  return c;
587 }
588 
589 /* read and allocate a DVB string preceded by its length */
590 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
591 {
592  int len;
593  const uint8_t *p;
594  char *str;
595 
596  p = *pp;
597  len = get8(&p, p_end);
598  if (len < 0)
599  return NULL;
600  if ((p + len) > p_end)
601  return NULL;
602  str = av_malloc(len + 1);
603  if (!str)
604  return NULL;
605  memcpy(str, p, len);
606  str[len] = '\0';
607  p += len;
608  *pp = p;
609  return str;
610 }
611 
613  const uint8_t **pp, const uint8_t *p_end)
614 {
615  int val;
616 
617  val = get8(pp, p_end);
618  if (val < 0)
619  return val;
620  h->tid = val;
621  *pp += 2;
622  val = get16(pp, p_end);
623  if (val < 0)
624  return val;
625  h->id = val;
626  val = get8(pp, p_end);
627  if (val < 0)
628  return val;
629  h->version = (val >> 1) & 0x1f;
630  val = get8(pp, p_end);
631  if (val < 0)
632  return val;
633  h->sec_num = val;
634  val = get8(pp, p_end);
635  if (val < 0)
636  return val;
637  h->last_sec_num = val;
638  return 0;
639 }
640 
641 typedef struct {
642  uint32_t stream_type;
645 } StreamType;
646 
647 static const StreamType ISO_types[] = {
654  /* Makito encoder sets stream type 0x11 for AAC,
655  * so auto-detect LOAS/LATM instead of hardcoding it. */
656 #if !CONFIG_LOAS_DEMUXER
657  { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
658 #endif
664  { 0 },
665 };
666 
667 static const StreamType HDMV_types[] = {
673  { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
674  { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
675  { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
676  { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
678  { 0 },
679 };
680 
681 /* ATSC ? */
682 static const StreamType MISC_types[] = {
685  { 0 },
686 };
687 
688 static const StreamType REGD_types[] = {
689  { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
690  { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
691  { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
692  { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
693  { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
694  { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
695  { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
696  { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
697  { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
698  { 0 },
699 };
700 
701 static const StreamType METADATA_types[] = {
702  { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
703  { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
704  { 0 },
705 };
706 
707 /* descriptor present */
708 static const StreamType DESC_types[] = {
709  { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
710  { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
713  { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
714  { 0 },
715 };
716 
718  uint32_t stream_type,
719  const StreamType *types)
720 {
721  if (avcodec_is_open(st->codec)) {
722  av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
723  return;
724  }
725 
726  for (; types->stream_type; types++)
727  if (stream_type == types->stream_type) {
728  st->codec->codec_type = types->codec_type;
729  st->codec->codec_id = types->codec_id;
730  st->request_probe = 0;
731  return;
732  }
733 }
734 
736  uint32_t stream_type, uint32_t prog_reg_desc)
737 {
738  int old_codec_type = st->codec->codec_type;
739  int old_codec_id = st->codec->codec_id;
740 
741  if (avcodec_is_open(st->codec)) {
742  av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
743  return 0;
744  }
745 
746  avpriv_set_pts_info(st, 33, 1, 90000);
747  st->priv_data = pes;
751  pes->st = st;
752  pes->stream_type = stream_type;
753 
754  av_log(pes->stream, AV_LOG_DEBUG,
755  "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
756  st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
757 
758  st->codec->codec_tag = pes->stream_type;
759 
760  mpegts_find_stream_type(st, pes->stream_type, ISO_types);
761  if ((prog_reg_desc == AV_RL32("HDMV") ||
762  prog_reg_desc == AV_RL32("HDPR")) &&
763  st->codec->codec_id == AV_CODEC_ID_NONE) {
764  mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
765  if (pes->stream_type == 0x83) {
766  // HDMV TrueHD streams also contain an AC3 coded version of the
767  // audio track - add a second stream for this
768  AVStream *sub_st;
769  // priv_data cannot be shared between streams
770  PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
771  if (!sub_pes)
772  return AVERROR(ENOMEM);
773  memcpy(sub_pes, pes, sizeof(*sub_pes));
774 
775  sub_st = avformat_new_stream(pes->stream, NULL);
776  if (!sub_st) {
777  av_free(sub_pes);
778  return AVERROR(ENOMEM);
779  }
780 
781  sub_st->id = pes->pid;
782  avpriv_set_pts_info(sub_st, 33, 1, 90000);
783  sub_st->priv_data = sub_pes;
785  sub_st->codec->codec_id = AV_CODEC_ID_AC3;
787  sub_pes->sub_st = pes->sub_st = sub_st;
788  }
789  }
790  if (st->codec->codec_id == AV_CODEC_ID_NONE)
791  mpegts_find_stream_type(st, pes->stream_type, MISC_types);
792  if (st->codec->codec_id == AV_CODEC_ID_NONE) {
793  st->codec->codec_id = old_codec_id;
794  st->codec->codec_type = old_codec_type;
795  }
796 
797  return 0;
798 }
799 
801 {
802  pes->pts = AV_NOPTS_VALUE;
803  pes->dts = AV_NOPTS_VALUE;
804  pes->data_index = 0;
805  pes->flags = 0;
806  av_buffer_unref(&pes->buffer);
807 }
808 
810 {
811  av_init_packet(pkt);
812 
813  pkt->buf = pes->buffer;
814  pkt->data = pes->buffer->data;
815  pkt->size = pes->data_index;
816 
817  if (pes->total_size != MAX_PES_PAYLOAD &&
818  pes->pes_header_size + pes->data_index != pes->total_size +
819  PES_START_SIZE) {
820  av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
821  pes->flags |= AV_PKT_FLAG_CORRUPT;
822  }
823  memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
824 
825  // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
826  if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
827  pkt->stream_index = pes->sub_st->index;
828  else
829  pkt->stream_index = pes->st->index;
830  pkt->pts = pes->pts;
831  pkt->dts = pes->dts;
832  /* store position of first TS packet of this PES packet */
833  pkt->pos = pes->ts_packet_pos;
834  pkt->flags = pes->flags;
835 
836  pes->buffer = NULL;
838 }
839 
840 static uint64_t get_ts64(GetBitContext *gb, int bits)
841 {
842  if (get_bits_left(gb) < bits)
843  return AV_NOPTS_VALUE;
844  return get_bits64(gb, bits);
845 }
846 
848  const uint8_t *buf, int buf_size)
849 {
850  GetBitContext gb;
851  int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
852  int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
853  int dts_flag = -1, cts_flag = -1;
854  int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
855 
856  init_get_bits(&gb, buf, buf_size * 8);
857 
858  if (sl->use_au_start)
859  au_start_flag = get_bits1(&gb);
860  if (sl->use_au_end)
861  au_end_flag = get_bits1(&gb);
862  if (!sl->use_au_start && !sl->use_au_end)
863  au_start_flag = au_end_flag = 1;
864  if (sl->ocr_len > 0)
865  ocr_flag = get_bits1(&gb);
866  if (sl->use_idle)
867  idle_flag = get_bits1(&gb);
868  if (sl->use_padding)
869  padding_flag = get_bits1(&gb);
870  if (padding_flag)
871  padding_bits = get_bits(&gb, 3);
872 
873  if (!idle_flag && (!padding_flag || padding_bits != 0)) {
874  if (sl->packet_seq_num_len)
876  if (sl->degr_prior_len)
877  if (get_bits1(&gb))
878  skip_bits(&gb, sl->degr_prior_len);
879  if (ocr_flag)
880  skip_bits_long(&gb, sl->ocr_len);
881  if (au_start_flag) {
882  if (sl->use_rand_acc_pt)
883  get_bits1(&gb);
884  if (sl->au_seq_num_len > 0)
885  skip_bits_long(&gb, sl->au_seq_num_len);
886  if (sl->use_timestamps) {
887  dts_flag = get_bits1(&gb);
888  cts_flag = get_bits1(&gb);
889  }
890  }
891  if (sl->inst_bitrate_len)
892  inst_bitrate_flag = get_bits1(&gb);
893  if (dts_flag == 1)
894  dts = get_ts64(&gb, sl->timestamp_len);
895  if (cts_flag == 1)
896  cts = get_ts64(&gb, sl->timestamp_len);
897  if (sl->au_len > 0)
898  skip_bits_long(&gb, sl->au_len);
899  if (inst_bitrate_flag)
901  }
902 
903  if (dts != AV_NOPTS_VALUE)
904  pes->dts = dts;
905  if (cts != AV_NOPTS_VALUE)
906  pes->pts = cts;
907 
908  if (sl->timestamp_len && sl->timestamp_res)
910 
911  return (get_bits_count(&gb) + 7) >> 3;
912 }
913 
914 /* return non zero if a packet could be constructed */
916  const uint8_t *buf, int buf_size, int is_start,
917  int64_t pos)
918 {
919  PESContext *pes = filter->u.pes_filter.opaque;
920  MpegTSContext *ts = pes->ts;
921  const uint8_t *p;
922  int len, code;
923 
924  if (!ts->pkt)
925  return 0;
926 
927  if (is_start) {
928  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
929  new_pes_packet(pes, ts->pkt);
930  ts->stop_parse = 1;
931  } else {
933  }
934  pes->state = MPEGTS_HEADER;
935  pes->ts_packet_pos = pos;
936  }
937  p = buf;
938  while (buf_size > 0) {
939  switch (pes->state) {
940  case MPEGTS_HEADER:
941  len = PES_START_SIZE - pes->data_index;
942  if (len > buf_size)
943  len = buf_size;
944  memcpy(pes->header + pes->data_index, p, len);
945  pes->data_index += len;
946  p += len;
947  buf_size -= len;
948  if (pes->data_index == PES_START_SIZE) {
949  /* we got all the PES or section header. We can now
950  * decide */
951  if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
952  pes->header[2] == 0x01) {
953  /* it must be an mpeg2 PES stream */
954  code = pes->header[3] | 0x100;
955  av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
956  code);
957 
958  if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
959  (!pes->sub_st ||
960  pes->sub_st->discard == AVDISCARD_ALL)) ||
961  code == 0x1be) /* padding_stream */
962  goto skip;
963 
964  /* stream not present in PMT */
965  if (!pes->st) {
966  if (ts->skip_changes)
967  goto skip;
968 
969  pes->st = avformat_new_stream(ts->stream, NULL);
970  if (!pes->st)
971  return AVERROR(ENOMEM);
972  pes->st->id = pes->pid;
973  mpegts_set_stream_info(pes->st, pes, 0, 0);
974  }
975 
976  pes->total_size = AV_RB16(pes->header + 4);
977  /* NOTE: a zero total size means the PES size is
978  * unbounded */
979  if (!pes->total_size)
981 
982  /* allocate pes buffer */
983  pes->buffer = av_buffer_alloc(pes->total_size +
985  if (!pes->buffer)
986  return AVERROR(ENOMEM);
987 
988  if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
989  code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
990  code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
991  code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
992  pes->state = MPEGTS_PESHEADER;
993  if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
994  av_dlog(pes->stream,
995  "pid=%x stream_type=%x probing\n",
996  pes->pid,
997  pes->stream_type);
998  pes->st->request_probe = 1;
999  }
1000  } else {
1001  pes->state = MPEGTS_PAYLOAD;
1002  pes->data_index = 0;
1003  }
1004  } else {
1005  /* otherwise, it should be a table */
1006  /* skip packet */
1007 skip:
1008  pes->state = MPEGTS_SKIP;
1009  continue;
1010  }
1011  }
1012  break;
1013  /**********************************************/
1014  /* PES packing parsing */
1015  case MPEGTS_PESHEADER:
1016  len = PES_HEADER_SIZE - pes->data_index;
1017  if (len < 0)
1018  return AVERROR_INVALIDDATA;
1019  if (len > buf_size)
1020  len = buf_size;
1021  memcpy(pes->header + pes->data_index, p, len);
1022  pes->data_index += len;
1023  p += len;
1024  buf_size -= len;
1025  if (pes->data_index == PES_HEADER_SIZE) {
1026  pes->pes_header_size = pes->header[8] + 9;
1028  }
1029  break;
1030  case MPEGTS_PESHEADER_FILL:
1031  len = pes->pes_header_size - pes->data_index;
1032  if (len < 0)
1033  return AVERROR_INVALIDDATA;
1034  if (len > buf_size)
1035  len = buf_size;
1036  memcpy(pes->header + pes->data_index, p, len);
1037  pes->data_index += len;
1038  p += len;
1039  buf_size -= len;
1040  if (pes->data_index == pes->pes_header_size) {
1041  const uint8_t *r;
1042  unsigned int flags, pes_ext, skip;
1043 
1044  flags = pes->header[7];
1045  r = pes->header + 9;
1046  pes->pts = AV_NOPTS_VALUE;
1047  pes->dts = AV_NOPTS_VALUE;
1048  if ((flags & 0xc0) == 0x80) {
1049  pes->dts = pes->pts = ff_parse_pes_pts(r);
1050  r += 5;
1051  } else if ((flags & 0xc0) == 0xc0) {
1052  pes->pts = ff_parse_pes_pts(r);
1053  r += 5;
1054  pes->dts = ff_parse_pes_pts(r);
1055  r += 5;
1056  }
1057  pes->extended_stream_id = -1;
1058  if (flags & 0x01) { /* PES extension */
1059  pes_ext = *r++;
1060  /* Skip PES private data, program packet sequence counter and P-STD buffer */
1061  skip = (pes_ext >> 4) & 0xb;
1062  skip += skip & 0x9;
1063  r += skip;
1064  if ((pes_ext & 0x41) == 0x01 &&
1065  (r + 2) <= (pes->header + pes->pes_header_size)) {
1066  /* PES extension 2 */
1067  if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1068  pes->extended_stream_id = r[1];
1069  }
1070  }
1071 
1072  /* we got the full header. We parse it and get the payload */
1073  pes->state = MPEGTS_PAYLOAD;
1074  pes->data_index = 0;
1075  if (pes->stream_type == 0x12 && buf_size > 0) {
1076  int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1077  buf_size);
1078  pes->pes_header_size += sl_header_bytes;
1079  p += sl_header_bytes;
1080  buf_size -= sl_header_bytes;
1081  }
1082  if (pes->stream_type == 0x15 && buf_size >= 5) {
1083  /* skip metadata access unit header */
1084  pes->pes_header_size += 5;
1085  p += 5;
1086  buf_size -= 5;
1087  }
1088  if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1089  AVProgram *p = NULL;
1090  while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1091  if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1092  MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1093  if (f) {
1094  AVStream *st = NULL;
1095  if (f->type == MPEGTS_PES) {
1096  PESContext *pcrpes = f->u.pes_filter.opaque;
1097  if (pcrpes)
1098  st = pcrpes->st;
1099  } else if (f->type == MPEGTS_PCR) {
1100  int i;
1101  for (i = 0; i < p->nb_stream_indexes; i++) {
1102  AVStream *pst = pes->stream->streams[p->stream_index[i]];
1103  if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1104  st = pst;
1105  }
1106  }
1107  if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1108  // teletext packets do not always have correct timestamps,
1109  // the standard says they should be handled after 40.6 ms at most,
1110  // and the pcr error to this packet should be no more than 100 ms.
1111  // TODO: we should interpolate the PCR, not just use the last one
1112  int64_t pcr = f->last_pcr / 300;
1115  if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1116  pes->pts = pes->dts = pcr;
1117  } else if (pes->dts > pcr + 3654 + 9000) {
1118  pes->pts = pes->dts = pcr + 3654 + 9000;
1119  }
1120  break;
1121  }
1122  }
1123  }
1124  }
1125  }
1126  }
1127  break;
1128  case MPEGTS_PAYLOAD:
1129  if (pes->buffer) {
1130  if (pes->data_index > 0 &&
1131  pes->data_index + buf_size > pes->total_size) {
1132  new_pes_packet(pes, ts->pkt);
1133  pes->total_size = MAX_PES_PAYLOAD;
1134  pes->buffer = av_buffer_alloc(pes->total_size +
1136  if (!pes->buffer)
1137  return AVERROR(ENOMEM);
1138  ts->stop_parse = 1;
1139  } else if (pes->data_index == 0 &&
1140  buf_size > pes->total_size) {
1141  // pes packet size is < ts size packet and pes data is padded with 0xff
1142  // not sure if this is legal in ts but see issue #2392
1143  buf_size = pes->total_size;
1144  }
1145  memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1146  pes->data_index += buf_size;
1147  /* emit complete packets with known packet size
1148  * decreases demuxer delay for infrequent packets like subtitles from
1149  * a couple of seconds to milliseconds for properly muxed files.
1150  * total_size is the number of bytes following pes_packet_length
1151  * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1152  if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1153  pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1154  ts->stop_parse = 1;
1155  new_pes_packet(pes, ts->pkt);
1156  }
1157  }
1158  buf_size = 0;
1159  break;
1160  case MPEGTS_SKIP:
1161  buf_size = 0;
1162  break;
1163  }
1164  }
1165 
1166  return 0;
1167 }
1168 
1169 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1170 {
1171  MpegTSFilter *tss;
1172  PESContext *pes;
1173 
1174  /* if no pid found, then add a pid context */
1175  pes = av_mallocz(sizeof(PESContext));
1176  if (!pes)
1177  return 0;
1178  pes->ts = ts;
1179  pes->stream = ts->stream;
1180  pes->pid = pid;
1181  pes->pcr_pid = pcr_pid;
1182  pes->state = MPEGTS_SKIP;
1183  pes->pts = AV_NOPTS_VALUE;
1184  pes->dts = AV_NOPTS_VALUE;
1185  tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1186  if (!tss) {
1187  av_free(pes);
1188  return 0;
1189  }
1190  return pes;
1191 }
1192 
1193 #define MAX_LEVEL 4
1194 typedef struct {
1201  int level;
1204 
1206  const uint8_t *buf, unsigned size,
1207  Mp4Descr *descr, int max_descr_count)
1208 {
1209  int ret;
1210  if (size > (1 << 30))
1211  return AVERROR_INVALIDDATA;
1212 
1213  if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1214  NULL, NULL, NULL, NULL)) < 0)
1215  return ret;
1216 
1217  d->s = s;
1218  d->level = 0;
1219  d->descr_count = 0;
1220  d->descr = descr;
1221  d->active_descr = NULL;
1222  d->max_descr_count = max_descr_count;
1223 
1224  return 0;
1225 }
1226 
1227 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1228 {
1229  int64_t new_off = avio_tell(pb);
1230  (*len) -= new_off - *off;
1231  *off = new_off;
1232 }
1233 
1234 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1235  int target_tag);
1236 
1237 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1238 {
1239  while (len > 0) {
1240  int ret = parse_mp4_descr(d, off, len, 0);
1241  if (ret < 0)
1242  return ret;
1243  update_offsets(&d->pb, &off, &len);
1244  }
1245  return 0;
1246 }
1247 
1248 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1249 {
1250  avio_rb16(&d->pb); // ID
1251  avio_r8(&d->pb);
1252  avio_r8(&d->pb);
1253  avio_r8(&d->pb);
1254  avio_r8(&d->pb);
1255  avio_r8(&d->pb);
1256  update_offsets(&d->pb, &off, &len);
1257  return parse_mp4_descr_arr(d, off, len);
1258 }
1259 
1260 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1261 {
1262  int id_flags;
1263  if (len < 2)
1264  return 0;
1265  id_flags = avio_rb16(&d->pb);
1266  if (!(id_flags & 0x0020)) { // URL_Flag
1267  update_offsets(&d->pb, &off, &len);
1268  return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1269  } else {
1270  return 0;
1271  }
1272 }
1273 
1274 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1275 {
1276  int es_id = 0;
1277  if (d->descr_count >= d->max_descr_count)
1278  return AVERROR_INVALIDDATA;
1279  ff_mp4_parse_es_descr(&d->pb, &es_id);
1280  d->active_descr = d->descr + (d->descr_count++);
1281 
1282  d->active_descr->es_id = es_id;
1283  update_offsets(&d->pb, &off, &len);
1284  parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1285  update_offsets(&d->pb, &off, &len);
1286  if (len > 0)
1287  parse_mp4_descr(d, off, len, MP4SLDescrTag);
1288  d->active_descr = NULL;
1289  return 0;
1290 }
1291 
1293  int len)
1294 {
1295  Mp4Descr *descr = d->active_descr;
1296  if (!descr)
1297  return AVERROR_INVALIDDATA;
1299  if (!descr->dec_config_descr)
1300  return AVERROR(ENOMEM);
1301  descr->dec_config_descr_len = len;
1302  avio_read(&d->pb, descr->dec_config_descr, len);
1303  return 0;
1304 }
1305 
1306 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1307 {
1308  Mp4Descr *descr = d->active_descr;
1309  int predefined;
1310  if (!descr)
1311  return AVERROR_INVALIDDATA;
1312 
1313  predefined = avio_r8(&d->pb);
1314  if (!predefined) {
1315  int lengths;
1316  int flags = avio_r8(&d->pb);
1317  descr->sl.use_au_start = !!(flags & 0x80);
1318  descr->sl.use_au_end = !!(flags & 0x40);
1319  descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1320  descr->sl.use_padding = !!(flags & 0x08);
1321  descr->sl.use_timestamps = !!(flags & 0x04);
1322  descr->sl.use_idle = !!(flags & 0x02);
1323  descr->sl.timestamp_res = avio_rb32(&d->pb);
1324  avio_rb32(&d->pb);
1325  descr->sl.timestamp_len = avio_r8(&d->pb);
1326  if (descr->sl.timestamp_len > 64) {
1327  avpriv_request_sample(NULL, "timestamp_len > 64");
1328  descr->sl.timestamp_len = 64;
1329  return AVERROR_PATCHWELCOME;
1330  }
1331  descr->sl.ocr_len = avio_r8(&d->pb);
1332  descr->sl.au_len = avio_r8(&d->pb);
1333  descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1334  lengths = avio_rb16(&d->pb);
1335  descr->sl.degr_prior_len = lengths >> 12;
1336  descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1337  descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1338  } else if (!d->predefined_SLConfigDescriptor_seen){
1339  avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1341  }
1342  return 0;
1343 }
1344 
1345 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1346  int target_tag)
1347 {
1348  int tag;
1349  int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1350  update_offsets(&d->pb, &off, &len);
1351  if (len < 0 || len1 > len || len1 <= 0) {
1352  av_log(d->s, AV_LOG_ERROR,
1353  "Tag %x length violation new length %d bytes remaining %d\n",
1354  tag, len1, len);
1355  return AVERROR_INVALIDDATA;
1356  }
1357 
1358  if (d->level++ >= MAX_LEVEL) {
1359  av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1360  goto done;
1361  }
1362 
1363  if (target_tag && tag != target_tag) {
1364  av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1365  target_tag);
1366  goto done;
1367  }
1368 
1369  switch (tag) {
1370  case MP4IODescrTag:
1371  parse_MP4IODescrTag(d, off, len1);
1372  break;
1373  case MP4ODescrTag:
1374  parse_MP4ODescrTag(d, off, len1);
1375  break;
1376  case MP4ESDescrTag:
1377  parse_MP4ESDescrTag(d, off, len1);
1378  break;
1379  case MP4DecConfigDescrTag:
1380  parse_MP4DecConfigDescrTag(d, off, len1);
1381  break;
1382  case MP4SLDescrTag:
1383  parse_MP4SLDescrTag(d, off, len1);
1384  break;
1385  }
1386 
1387 
1388 done:
1389  d->level--;
1390  avio_seek(&d->pb, off + len1, SEEK_SET);
1391  return 0;
1392 }
1393 
1394 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1395  Mp4Descr *descr, int *descr_count, int max_descr_count)
1396 {
1398  int ret;
1399 
1400  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1401  if (ret < 0)
1402  return ret;
1403 
1404  ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1405 
1406  *descr_count = d.descr_count;
1407  return ret;
1408 }
1409 
1410 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1411  Mp4Descr *descr, int *descr_count, int max_descr_count)
1412 {
1414  int ret;
1415 
1416  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1417  if (ret < 0)
1418  return ret;
1419 
1420  ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1421 
1422  *descr_count = d.descr_count;
1423  return ret;
1424 }
1425 
1427  int section_len)
1428 {
1429  MpegTSContext *ts = filter->u.section_filter.opaque;
1430  SectionHeader h;
1431  const uint8_t *p, *p_end;
1432  AVIOContext pb;
1433  int mp4_descr_count = 0;
1434  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1435  int i, pid;
1436  AVFormatContext *s = ts->stream;
1437 
1438  p_end = section + section_len - 4;
1439  p = section;
1440  if (parse_section_header(&h, &p, p_end) < 0)
1441  return;
1442  if (h.tid != M4OD_TID)
1443  return;
1444 
1445  mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1447 
1448  for (pid = 0; pid < NB_PID_MAX; pid++) {
1449  if (!ts->pids[pid])
1450  continue;
1451  for (i = 0; i < mp4_descr_count; i++) {
1452  PESContext *pes;
1453  AVStream *st;
1454  if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1455  continue;
1456  if (ts->pids[pid]->type != MPEGTS_PES) {
1457  av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1458  continue;
1459  }
1460  pes = ts->pids[pid]->u.pes_filter.opaque;
1461  st = pes->st;
1462  if (!st)
1463  continue;
1464 
1465  pes->sl = mp4_descr[i].sl;
1466 
1467  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1468  mp4_descr[i].dec_config_descr_len, 0,
1469  NULL, NULL, NULL, NULL);
1470  ff_mp4_read_dec_config_descr(s, st, &pb);
1471  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1472  st->codec->extradata_size > 0)
1473  st->need_parsing = 0;
1474  if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1475  st->codec->extradata_size > 0)
1476  st->need_parsing = 0;
1477 
1478  if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1479  // do nothing
1480  } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1482  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1484  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1486  }
1487  }
1488  for (i = 0; i < mp4_descr_count; i++)
1489  av_free(mp4_descr[i].dec_config_descr);
1490 }
1491 
1493  const uint8_t **pp, const uint8_t *desc_list_end,
1494  Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1495  MpegTSContext *ts)
1496 {
1497  const uint8_t *desc_end;
1498  int desc_len, desc_tag, desc_es_id;
1499  char language[252];
1500  int i;
1501 
1502  desc_tag = get8(pp, desc_list_end);
1503  if (desc_tag < 0)
1504  return AVERROR_INVALIDDATA;
1505  desc_len = get8(pp, desc_list_end);
1506  if (desc_len < 0)
1507  return AVERROR_INVALIDDATA;
1508  desc_end = *pp + desc_len;
1509  if (desc_end > desc_list_end)
1510  return AVERROR_INVALIDDATA;
1511 
1512  av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1513 
1514  if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1515  stream_type == STREAM_TYPE_PRIVATE_DATA)
1516  mpegts_find_stream_type(st, desc_tag, DESC_types);
1517 
1518  switch (desc_tag) {
1519  case 0x1E: /* SL descriptor */
1520  desc_es_id = get16(pp, desc_end);
1521  if (ts && ts->pids[pid])
1522  ts->pids[pid]->es_id = desc_es_id;
1523  for (i = 0; i < mp4_descr_count; i++)
1524  if (mp4_descr[i].dec_config_descr_len &&
1525  mp4_descr[i].es_id == desc_es_id) {
1526  AVIOContext pb;
1527  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1528  mp4_descr[i].dec_config_descr_len, 0,
1529  NULL, NULL, NULL, NULL);
1530  ff_mp4_read_dec_config_descr(fc, st, &pb);
1531  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1532  st->codec->extradata_size > 0)
1533  st->need_parsing = 0;
1535  mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1536  }
1537  break;
1538  case 0x1F: /* FMC descriptor */
1539  get16(pp, desc_end);
1540  if (mp4_descr_count > 0 &&
1541  (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1542  mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1543  AVIOContext pb;
1544  ffio_init_context(&pb, mp4_descr->dec_config_descr,
1545  mp4_descr->dec_config_descr_len, 0,
1546  NULL, NULL, NULL, NULL);
1547  ff_mp4_read_dec_config_descr(fc, st, &pb);
1548  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1549  st->codec->extradata_size > 0) {
1550  st->request_probe = st->need_parsing = 0;
1552  }
1553  }
1554  break;
1555  case 0x56: /* DVB teletext descriptor */
1556  {
1557  uint8_t *extradata = NULL;
1558  int language_count = desc_len / 5;
1559 
1560  if (desc_len > 0 && desc_len % 5 != 0)
1561  return AVERROR_INVALIDDATA;
1562 
1563  if (language_count > 0) {
1564  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1565  if (language_count > sizeof(language) / 4) {
1566  language_count = sizeof(language) / 4;
1567  }
1568 
1569  if (st->codec->extradata == NULL) {
1570  if (ff_alloc_extradata(st->codec, language_count * 2)) {
1571  return AVERROR(ENOMEM);
1572  }
1573  }
1574 
1575  if (st->codec->extradata_size < language_count * 2)
1576  return AVERROR_INVALIDDATA;
1577 
1578  extradata = st->codec->extradata;
1579 
1580  for (i = 0; i < language_count; i++) {
1581  language[i * 4 + 0] = get8(pp, desc_end);
1582  language[i * 4 + 1] = get8(pp, desc_end);
1583  language[i * 4 + 2] = get8(pp, desc_end);
1584  language[i * 4 + 3] = ',';
1585 
1586  memcpy(extradata, *pp, 2);
1587  extradata += 2;
1588 
1589  *pp += 2;
1590  }
1591 
1592  language[i * 4 - 1] = 0;
1593  av_dict_set(&st->metadata, "language", language, 0);
1594  }
1595  }
1596  break;
1597  case 0x59: /* subtitling descriptor */
1598  {
1599  /* 8 bytes per DVB subtitle substream data:
1600  * ISO_639_language_code (3 bytes),
1601  * subtitling_type (1 byte),
1602  * composition_page_id (2 bytes),
1603  * ancillary_page_id (2 bytes) */
1604  int language_count = desc_len / 8;
1605 
1606  if (desc_len > 0 && desc_len % 8 != 0)
1607  return AVERROR_INVALIDDATA;
1608 
1609  if (language_count > 1) {
1610  avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1611  }
1612 
1613  if (language_count > 0) {
1614  uint8_t *extradata;
1615 
1616  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1617  if (language_count > sizeof(language) / 4) {
1618  language_count = sizeof(language) / 4;
1619  }
1620 
1621  if (st->codec->extradata == NULL) {
1622  if (ff_alloc_extradata(st->codec, language_count * 5)) {
1623  return AVERROR(ENOMEM);
1624  }
1625  }
1626 
1627  if (st->codec->extradata_size < language_count * 5)
1628  return AVERROR_INVALIDDATA;
1629 
1630  extradata = st->codec->extradata;
1631 
1632  for (i = 0; i < language_count; i++) {
1633  language[i * 4 + 0] = get8(pp, desc_end);
1634  language[i * 4 + 1] = get8(pp, desc_end);
1635  language[i * 4 + 2] = get8(pp, desc_end);
1636  language[i * 4 + 3] = ',';
1637 
1638  /* hearing impaired subtitles detection using subtitling_type */
1639  switch (*pp[0]) {
1640  case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1641  case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1642  case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1643  case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1644  case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1645  case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1647  break;
1648  }
1649 
1650  extradata[4] = get8(pp, desc_end); /* subtitling_type */
1651  memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1652  extradata += 5;
1653 
1654  *pp += 4;
1655  }
1656 
1657  language[i * 4 - 1] = 0;
1658  av_dict_set(&st->metadata, "language", language, 0);
1659  }
1660  }
1661  break;
1662  case 0x0a: /* ISO 639 language descriptor */
1663  for (i = 0; i + 4 <= desc_len; i += 4) {
1664  language[i + 0] = get8(pp, desc_end);
1665  language[i + 1] = get8(pp, desc_end);
1666  language[i + 2] = get8(pp, desc_end);
1667  language[i + 3] = ',';
1668  switch (get8(pp, desc_end)) {
1669  case 0x01:
1671  break;
1672  case 0x02:
1674  break;
1675  case 0x03:
1677  break;
1678  }
1679  }
1680  if (i && language[0]) {
1681  language[i - 1] = 0;
1682  av_dict_set(&st->metadata, "language", language, 0);
1683  }
1684  break;
1685  case 0x05: /* registration descriptor */
1686  st->codec->codec_tag = bytestream_get_le32(pp);
1687  av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1688  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1689  mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1690  break;
1691  case 0x52: /* stream identifier descriptor */
1692  st->stream_identifier = 1 + get8(pp, desc_end);
1693  break;
1694  case 0x26: /* metadata descriptor */
1695  if (get16(pp, desc_end) == 0xFFFF)
1696  *pp += 4;
1697  if (get8(pp, desc_end) == 0xFF) {
1698  st->codec->codec_tag = bytestream_get_le32(pp);
1699  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1700  mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1701  }
1702  break;
1703  default:
1704  break;
1705  }
1706  *pp = desc_end;
1707  return 0;
1708 }
1709 
1710 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1711 {
1712  MpegTSContext *ts = filter->u.section_filter.opaque;
1713  SectionHeader h1, *h = &h1;
1714  PESContext *pes;
1715  AVStream *st;
1716  const uint8_t *p, *p_end, *desc_list_end;
1717  int program_info_length, pcr_pid, pid, stream_type;
1718  int desc_list_len;
1719  uint32_t prog_reg_desc = 0; /* registration descriptor */
1720 
1721  int mp4_descr_count = 0;
1722  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1723  int i;
1724 
1725  av_dlog(ts->stream, "PMT: len %i\n", section_len);
1726  hex_dump_debug(ts->stream, section, section_len);
1727 
1728  p_end = section + section_len - 4;
1729  p = section;
1730  if (parse_section_header(h, &p, p_end) < 0)
1731  return;
1732 
1733  av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1734  h->id, h->sec_num, h->last_sec_num);
1735 
1736  if (h->tid != PMT_TID)
1737  return;
1738  if (ts->skip_changes)
1739  return;
1740 
1741  clear_program(ts, h->id);
1742  pcr_pid = get16(&p, p_end);
1743  if (pcr_pid < 0)
1744  return;
1745  pcr_pid &= 0x1fff;
1746  add_pid_to_pmt(ts, h->id, pcr_pid);
1747  set_pcr_pid(ts->stream, h->id, pcr_pid);
1748 
1749  av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1750 
1751  program_info_length = get16(&p, p_end);
1752  if (program_info_length < 0)
1753  return;
1754  program_info_length &= 0xfff;
1755  while (program_info_length >= 2) {
1756  uint8_t tag, len;
1757  tag = get8(&p, p_end);
1758  len = get8(&p, p_end);
1759 
1760  av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1761 
1762  if (len > program_info_length - 2)
1763  // something else is broken, exit the program_descriptors_loop
1764  break;
1765  program_info_length -= len + 2;
1766  if (tag == 0x1d) { // IOD descriptor
1767  get8(&p, p_end); // scope
1768  get8(&p, p_end); // label
1769  len -= 2;
1770  mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1771  &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1772  } else if (tag == 0x05 && len >= 4) { // registration descriptor
1773  prog_reg_desc = bytestream_get_le32(&p);
1774  len -= 4;
1775  }
1776  p += len;
1777  }
1778  p += program_info_length;
1779  if (p >= p_end)
1780  goto out;
1781 
1782  // stop parsing after pmt, we found header
1783  if (!ts->stream->nb_streams)
1784  ts->stop_parse = 2;
1785 
1786  set_pmt_found(ts, h->id);
1787 
1788 
1789  for (;;) {
1790  st = 0;
1791  pes = NULL;
1792  stream_type = get8(&p, p_end);
1793  if (stream_type < 0)
1794  break;
1795  pid = get16(&p, p_end);
1796  if (pid < 0)
1797  goto out;
1798  pid &= 0x1fff;
1799  if (pid == ts->current_pid)
1800  goto out;
1801 
1802  /* now create stream */
1803  if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1804  pes = ts->pids[pid]->u.pes_filter.opaque;
1805  if (!pes->st) {
1806  pes->st = avformat_new_stream(pes->stream, NULL);
1807  if (!pes->st)
1808  goto out;
1809  pes->st->id = pes->pid;
1810  }
1811  st = pes->st;
1812  } else if (stream_type != 0x13) {
1813  if (ts->pids[pid])
1814  mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1815  pes = add_pes_stream(ts, pid, pcr_pid);
1816  if (pes) {
1817  st = avformat_new_stream(pes->stream, NULL);
1818  if (!st)
1819  goto out;
1820  st->id = pes->pid;
1821  }
1822  } else {
1823  int idx = ff_find_stream_index(ts->stream, pid);
1824  if (idx >= 0) {
1825  st = ts->stream->streams[idx];
1826  } else {
1827  st = avformat_new_stream(ts->stream, NULL);
1828  if (!st)
1829  goto out;
1830  st->id = pid;
1832  }
1833  }
1834 
1835  if (!st)
1836  goto out;
1837 
1838  if (pes && !pes->stream_type)
1839  mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1840 
1841  add_pid_to_pmt(ts, h->id, pid);
1842 
1844 
1845  desc_list_len = get16(&p, p_end);
1846  if (desc_list_len < 0)
1847  goto out;
1848  desc_list_len &= 0xfff;
1849  desc_list_end = p + desc_list_len;
1850  if (desc_list_end > p_end)
1851  goto out;
1852  for (;;) {
1853  if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1854  desc_list_end, mp4_descr,
1855  mp4_descr_count, pid, ts) < 0)
1856  break;
1857 
1858  if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1859  stream_type == 0x83 && pes->sub_st) {
1861  pes->sub_st->index);
1862  pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1863  }
1864  }
1865  p = desc_list_end;
1866  }
1867 
1868  if (!ts->pids[pcr_pid])
1869  mpegts_open_pcr_filter(ts, pcr_pid);
1870 
1871 out:
1872  for (i = 0; i < mp4_descr_count; i++)
1873  av_free(mp4_descr[i].dec_config_descr);
1874 }
1875 
1876 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1877 {
1878  MpegTSContext *ts = filter->u.section_filter.opaque;
1879  SectionHeader h1, *h = &h1;
1880  const uint8_t *p, *p_end;
1881  int sid, pmt_pid;
1882  AVProgram *program;
1883 
1884  av_dlog(ts->stream, "PAT:\n");
1885  hex_dump_debug(ts->stream, section, section_len);
1886 
1887  p_end = section + section_len - 4;
1888  p = section;
1889  if (parse_section_header(h, &p, p_end) < 0)
1890  return;
1891  if (h->tid != PAT_TID)
1892  return;
1893  if (ts->skip_changes)
1894  return;
1895 
1896  ts->stream->ts_id = h->id;
1897 
1898  clear_programs(ts);
1899  for (;;) {
1900  sid = get16(&p, p_end);
1901  if (sid < 0)
1902  break;
1903  pmt_pid = get16(&p, p_end);
1904  if (pmt_pid < 0)
1905  break;
1906  pmt_pid &= 0x1fff;
1907 
1908  if (pmt_pid == ts->current_pid)
1909  break;
1910 
1911  av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1912 
1913  if (sid == 0x0000) {
1914  /* NIT info */
1915  } else {
1916  MpegTSFilter *fil = ts->pids[pmt_pid];
1917  program = av_new_program(ts->stream, sid);
1918  program->program_num = sid;
1919  program->pmt_pid = pmt_pid;
1920  if (fil)
1921  if ( fil->type != MPEGTS_SECTION
1922  || fil->pid != pmt_pid
1923  || fil->u.section_filter.section_cb != pmt_cb)
1924  mpegts_close_filter(ts, ts->pids[pmt_pid]);
1925 
1926  if (!ts->pids[pmt_pid])
1927  mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1928  add_pat_entry(ts, sid);
1929  add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1930  add_pid_to_pmt(ts, sid, pmt_pid);
1931  }
1932  }
1933 
1934  if (sid < 0) {
1935  int i,j;
1936  for (j=0; j<ts->stream->nb_programs; j++) {
1937  for (i = 0; i < ts->nb_prg; i++)
1938  if (ts->prg[i].id == ts->stream->programs[j]->id)
1939  break;
1940  if (i==ts->nb_prg && !ts->skip_clear)
1941  clear_avprogram(ts, ts->stream->programs[j]->id);
1942  }
1943  }
1944 }
1945 
1946 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1947 {
1948  MpegTSContext *ts = filter->u.section_filter.opaque;
1949  SectionHeader h1, *h = &h1;
1950  const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1951  int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1952  char *name, *provider_name;
1953 
1954  av_dlog(ts->stream, "SDT:\n");
1955  hex_dump_debug(ts->stream, section, section_len);
1956 
1957  p_end = section + section_len - 4;
1958  p = section;
1959  if (parse_section_header(h, &p, p_end) < 0)
1960  return;
1961  if (h->tid != SDT_TID)
1962  return;
1963  if (ts->skip_changes)
1964  return;
1965  onid = get16(&p, p_end);
1966  if (onid < 0)
1967  return;
1968  val = get8(&p, p_end);
1969  if (val < 0)
1970  return;
1971  for (;;) {
1972  sid = get16(&p, p_end);
1973  if (sid < 0)
1974  break;
1975  val = get8(&p, p_end);
1976  if (val < 0)
1977  break;
1978  desc_list_len = get16(&p, p_end);
1979  if (desc_list_len < 0)
1980  break;
1981  desc_list_len &= 0xfff;
1982  desc_list_end = p + desc_list_len;
1983  if (desc_list_end > p_end)
1984  break;
1985  for (;;) {
1986  desc_tag = get8(&p, desc_list_end);
1987  if (desc_tag < 0)
1988  break;
1989  desc_len = get8(&p, desc_list_end);
1990  desc_end = p + desc_len;
1991  if (desc_end > desc_list_end)
1992  break;
1993 
1994  av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1995  desc_tag, desc_len);
1996 
1997  switch (desc_tag) {
1998  case 0x48:
1999  service_type = get8(&p, p_end);
2000  if (service_type < 0)
2001  break;
2002  provider_name = getstr8(&p, p_end);
2003  if (!provider_name)
2004  break;
2005  name = getstr8(&p, p_end);
2006  if (name) {
2007  AVProgram *program = av_new_program(ts->stream, sid);
2008  if (program) {
2009  av_dict_set(&program->metadata, "service_name", name, 0);
2010  av_dict_set(&program->metadata, "service_provider",
2011  provider_name, 0);
2012  }
2013  }
2014  av_free(name);
2015  av_free(provider_name);
2016  break;
2017  default:
2018  break;
2019  }
2020  p = desc_end;
2021  }
2022  p = desc_list_end;
2023  }
2024 }
2025 
2026 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2027  const uint8_t *packet);
2028 
2029 /* handle one TS packet */
2030 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2031 {
2032  MpegTSFilter *tss;
2033  int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2034  has_adaptation, has_payload;
2035  const uint8_t *p, *p_end;
2036  int64_t pos;
2037 
2038  pid = AV_RB16(packet + 1) & 0x1fff;
2039  if (pid && discard_pid(ts, pid))
2040  return 0;
2041  is_start = packet[1] & 0x40;
2042  tss = ts->pids[pid];
2043  if (ts->auto_guess && !tss && is_start) {
2044  add_pes_stream(ts, pid, -1);
2045  tss = ts->pids[pid];
2046  }
2047  if (!tss)
2048  return 0;
2049  ts->current_pid = pid;
2050 
2051  afc = (packet[3] >> 4) & 3;
2052  if (afc == 0) /* reserved value */
2053  return 0;
2054  has_adaptation = afc & 2;
2055  has_payload = afc & 1;
2056  is_discontinuity = has_adaptation &&
2057  packet[4] != 0 && /* with length > 0 */
2058  (packet[5] & 0x80); /* and discontinuity indicated */
2059 
2060  /* continuity check (currently not used) */
2061  cc = (packet[3] & 0xf);
2062  expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2063  cc_ok = pid == 0x1FFF || // null packet PID
2064  is_discontinuity ||
2065  tss->last_cc < 0 ||
2066  expected_cc == cc;
2067 
2068  tss->last_cc = cc;
2069  if (!cc_ok) {
2070  av_log(ts->stream, AV_LOG_DEBUG,
2071  "Continuity check failed for pid %d expected %d got %d\n",
2072  pid, expected_cc, cc);
2073  if (tss->type == MPEGTS_PES) {
2074  PESContext *pc = tss->u.pes_filter.opaque;
2075  pc->flags |= AV_PKT_FLAG_CORRUPT;
2076  }
2077  }
2078 
2079  p = packet + 4;
2080  if (has_adaptation) {
2081  int64_t pcr_h;
2082  int pcr_l;
2083  if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2084  tss->last_pcr = pcr_h * 300 + pcr_l;
2085  /* skip adaptation field */
2086  p += p[0] + 1;
2087  }
2088  /* if past the end of packet, ignore */
2089  p_end = packet + TS_PACKET_SIZE;
2090  if (p >= p_end || !has_payload)
2091  return 0;
2092 
2093  pos = avio_tell(ts->stream->pb);
2094  if (pos >= 0) {
2095  av_assert0(pos >= TS_PACKET_SIZE);
2096  ts->pos47_full = pos - TS_PACKET_SIZE;
2097  }
2098 
2099  if (tss->type == MPEGTS_SECTION) {
2100  if (is_start) {
2101  /* pointer field present */
2102  len = *p++;
2103  if (p + len > p_end)
2104  return 0;
2105  if (len && cc_ok) {
2106  /* write remaining section bytes */
2107  write_section_data(ts, tss,
2108  p, len, 0);
2109  /* check whether filter has been closed */
2110  if (!ts->pids[pid])
2111  return 0;
2112  }
2113  p += len;
2114  if (p < p_end) {
2115  write_section_data(ts, tss,
2116  p, p_end - p, 1);
2117  }
2118  } else {
2119  if (cc_ok) {
2120  write_section_data(ts, tss,
2121  p, p_end - p, 0);
2122  }
2123  }
2124 
2125  // stop find_stream_info from waiting for more streams
2126  // when all programs have received a PMT
2127  if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2128  int i;
2129  for (i = 0; i < ts->nb_prg; i++) {
2130  if (!ts->prg[i].pmt_found)
2131  break;
2132  }
2133  if (i == ts->nb_prg && ts->nb_prg > 0) {
2134  if (ts->stream->nb_streams > 1 || pos > 100000) {
2135  av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2137  }
2138  }
2139  }
2140 
2141  } else {
2142  int ret;
2143  // Note: The position here points actually behind the current packet.
2144  if (tss->type == MPEGTS_PES) {
2145  if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2146  pos - ts->raw_packet_size)) < 0)
2147  return ret;
2148  }
2149  }
2150 
2151  return 0;
2152 }
2153 
2154 static void reanalyze(MpegTSContext *ts) {
2155  AVIOContext *pb = ts->stream->pb;
2156  int64_t pos = avio_tell(pb);
2157  if (pos < 0)
2158  return;
2159  pos -= ts->pos47_full;
2160  if (pos == TS_PACKET_SIZE) {
2161  ts->size_stat[0] ++;
2162  } else if (pos == TS_DVHS_PACKET_SIZE) {
2163  ts->size_stat[1] ++;
2164  } else if (pos == TS_FEC_PACKET_SIZE) {
2165  ts->size_stat[2] ++;
2166  }
2167 
2168  ts->size_stat_count ++;
2170  int newsize = 0;
2171  if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2172  newsize = TS_PACKET_SIZE;
2173  } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2174  newsize = TS_DVHS_PACKET_SIZE;
2175  } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2176  newsize = TS_FEC_PACKET_SIZE;
2177  }
2178  if (newsize && newsize != ts->raw_packet_size) {
2179  av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2180  ts->raw_packet_size = newsize;
2181  }
2182  ts->size_stat_count = 0;
2183  memset(ts->size_stat, 0, sizeof(ts->size_stat));
2184  }
2185 }
2186 
2187 /* XXX: try to find a better synchro over several packets (use
2188  * get_packet_size() ?) */
2190 {
2191  AVIOContext *pb = s->pb;
2192  int c, i;
2193 
2194  for (i = 0; i < MAX_RESYNC_SIZE; i++) {
2195  c = avio_r8(pb);
2196  if (avio_feof(pb))
2197  return AVERROR_EOF;
2198  if (c == 0x47) {
2199  avio_seek(pb, -1, SEEK_CUR);
2200  reanalyze(s->priv_data);
2201  return 0;
2202  }
2203  }
2204  av_log(s, AV_LOG_ERROR,
2205  "max resync size reached, could not find sync byte\n");
2206  /* no sync found */
2207  return AVERROR_INVALIDDATA;
2208 }
2209 
2210 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2211 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2212  const uint8_t **data)
2213 {
2214  AVIOContext *pb = s->pb;
2215  int len;
2216 
2217  for (;;) {
2218  len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2219  if (len != TS_PACKET_SIZE)
2220  return len < 0 ? len : AVERROR_EOF;
2221  /* check packet sync byte */
2222  if ((*data)[0] != 0x47) {
2223  /* find a new packet start */
2224  uint64_t pos = avio_tell(pb);
2225  avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2226 
2227  if (mpegts_resync(s) < 0)
2228  return AVERROR(EAGAIN);
2229  else
2230  continue;
2231  } else {
2232  break;
2233  }
2234  }
2235  return 0;
2236 }
2237 
2238 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2239 {
2240  AVIOContext *pb = s->pb;
2241  int skip = raw_packet_size - TS_PACKET_SIZE;
2242  if (skip > 0)
2243  avio_skip(pb, skip);
2244 }
2245 
2246 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2247 {
2248  AVFormatContext *s = ts->stream;
2250  const uint8_t *data;
2251  int64_t packet_num;
2252  int ret = 0;
2253 
2254  if (avio_tell(s->pb) != ts->last_pos) {
2255  int i;
2256  av_dlog(ts->stream, "Skipping after seek\n");
2257  /* seek detected, flush pes buffer */
2258  for (i = 0; i < NB_PID_MAX; i++) {
2259  if (ts->pids[i]) {
2260  if (ts->pids[i]->type == MPEGTS_PES) {
2261  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2262  av_buffer_unref(&pes->buffer);
2263  pes->data_index = 0;
2264  pes->state = MPEGTS_SKIP; /* skip until pes header */
2265  }
2266  ts->pids[i]->last_cc = -1;
2267  ts->pids[i]->last_pcr = -1;
2268  }
2269  }
2270  }
2271 
2272  ts->stop_parse = 0;
2273  packet_num = 0;
2274  memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2275  for (;;) {
2276  packet_num++;
2277  if (nb_packets != 0 && packet_num >= nb_packets ||
2278  ts->stop_parse > 1) {
2279  ret = AVERROR(EAGAIN);
2280  break;
2281  }
2282  if (ts->stop_parse > 0)
2283  break;
2284 
2285  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2286  if (ret != 0)
2287  break;
2288  ret = handle_packet(ts, data);
2290  if (ret != 0)
2291  break;
2292  }
2293  ts->last_pos = avio_tell(s->pb);
2294  return ret;
2295 }
2296 
2298 {
2299  const int size = p->buf_size;
2300  int maxscore = 0;
2301  int sumscore = 0;
2302  int i;
2303  int check_count = size / TS_FEC_PACKET_SIZE;
2304 #define CHECK_COUNT 10
2305 #define CHECK_BLOCK 100
2306 
2307  if (check_count < CHECK_COUNT)
2308  return AVERROR_INVALIDDATA;
2309 
2310  for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2311  int left = FFMIN(check_count - i, CHECK_BLOCK);
2312  int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2313  int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2314  int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2315  score = FFMAX3(score, dvhs_score, fec_score);
2316  sumscore += score;
2317  maxscore = FFMAX(maxscore, score);
2318  }
2319 
2320  sumscore = sumscore * CHECK_COUNT / check_count;
2321  maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2322 
2323  av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2324 
2325  if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2326  else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2327  else
2328  return AVERROR_INVALIDDATA;
2329 }
2330 
2331 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2332  * (-1) if not available */
2333 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2334 {
2335  int afc, len, flags;
2336  const uint8_t *p;
2337  unsigned int v;
2338 
2339  afc = (packet[3] >> 4) & 3;
2340  if (afc <= 1)
2341  return AVERROR_INVALIDDATA;
2342  p = packet + 4;
2343  len = p[0];
2344  p++;
2345  if (len == 0)
2346  return AVERROR_INVALIDDATA;
2347  flags = *p++;
2348  len--;
2349  if (!(flags & 0x10))
2350  return AVERROR_INVALIDDATA;
2351  if (len < 6)
2352  return AVERROR_INVALIDDATA;
2353  v = AV_RB32(p);
2354  *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2355  *ppcr_low = ((p[4] & 1) << 8) | p[5];
2356  return 0;
2357 }
2358 
2359 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2360 
2361  /* NOTE: We attempt to seek on non-seekable files as well, as the
2362  * probe buffer usually is big enough. Only warn if the seek failed
2363  * on files where the seek should work. */
2364  if (avio_seek(pb, pos, SEEK_SET) < 0)
2365  av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2366 }
2367 
2369 {
2370  MpegTSContext *ts = s->priv_data;
2371  AVIOContext *pb = s->pb;
2372  uint8_t buf[8 * 1024] = {0};
2373  int len;
2374  int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2375 
2376  ffio_ensure_seekback(pb, probesize);
2377 
2378  /* read the first 8192 bytes to get packet size */
2379  pos = avio_tell(pb);
2380  len = avio_read(pb, buf, sizeof(buf));
2381  ts->raw_packet_size = get_packet_size(buf, len);
2382  if (ts->raw_packet_size <= 0) {
2383  av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2385  }
2386  ts->stream = s;
2387  ts->auto_guess = 0;
2388 
2389  if (s->iformat == &ff_mpegts_demuxer) {
2390  /* normal demux */
2391 
2392  /* first do a scan to get all the services */
2393  seek_back(s, pb, pos);
2394 
2396 
2398 
2399  handle_packets(ts, probesize / ts->raw_packet_size);
2400  /* if could not find service, enable auto_guess */
2401 
2402  ts->auto_guess = 1;
2403 
2404  av_dlog(ts->stream, "tuning done\n");
2405 
2407  } else {
2408  AVStream *st;
2409  int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2410  int64_t pcrs[2], pcr_h;
2411  int packet_count[2];
2412  uint8_t packet[TS_PACKET_SIZE];
2413  const uint8_t *data;
2414 
2415  /* only read packets */
2416 
2417  st = avformat_new_stream(s, NULL);
2418  if (!st)
2419  return AVERROR(ENOMEM);
2420  avpriv_set_pts_info(st, 60, 1, 27000000);
2423 
2424  /* we iterate until we find two PCRs to estimate the bitrate */
2425  pcr_pid = -1;
2426  nb_pcrs = 0;
2427  nb_packets = 0;
2428  for (;;) {
2429  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2430  if (ret < 0)
2431  return ret;
2432  pid = AV_RB16(data + 1) & 0x1fff;
2433  if ((pcr_pid == -1 || pcr_pid == pid) &&
2434  parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2436  pcr_pid = pid;
2437  packet_count[nb_pcrs] = nb_packets;
2438  pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2439  nb_pcrs++;
2440  if (nb_pcrs >= 2)
2441  break;
2442  } else {
2444  }
2445  nb_packets++;
2446  }
2447 
2448  /* NOTE1: the bitrate is computed without the FEC */
2449  /* NOTE2: it is only the bitrate of the start of the stream */
2450  ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2451  ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2452  s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2453  st->codec->bit_rate = s->bit_rate;
2454  st->start_time = ts->cur_pcr;
2455  av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2456  st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2457  }
2458 
2459  seek_back(s, pb, pos);
2460  return 0;
2461 }
2462 
2463 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2464 
2466 {
2467  MpegTSContext *ts = s->priv_data;
2468  int ret, i;
2469  int64_t pcr_h, next_pcr_h, pos;
2470  int pcr_l, next_pcr_l;
2471  uint8_t pcr_buf[12];
2472  const uint8_t *data;
2473 
2474  if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2475  return AVERROR(ENOMEM);
2476  ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2477  pkt->pos = avio_tell(s->pb);
2478  if (ret < 0) {
2479  av_free_packet(pkt);
2480  return ret;
2481  }
2482  if (data != pkt->data)
2483  memcpy(pkt->data, data, ts->raw_packet_size);
2485  if (ts->mpeg2ts_compute_pcr) {
2486  /* compute exact PCR for each packet */
2487  if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2488  /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2489  pos = avio_tell(s->pb);
2490  for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2491  avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2492  avio_read(s->pb, pcr_buf, 12);
2493  if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2494  /* XXX: not precise enough */
2495  ts->pcr_incr =
2496  ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2497  (i + 1);
2498  break;
2499  }
2500  }
2501  avio_seek(s->pb, pos, SEEK_SET);
2502  /* no next PCR found: we use previous increment */
2503  ts->cur_pcr = pcr_h * 300 + pcr_l;
2504  }
2505  pkt->pts = ts->cur_pcr;
2506  pkt->duration = ts->pcr_incr;
2507  ts->cur_pcr += ts->pcr_incr;
2508  }
2509  pkt->stream_index = 0;
2510  return 0;
2511 }
2512 
2514 {
2515  MpegTSContext *ts = s->priv_data;
2516  int ret, i;
2517 
2518  pkt->size = -1;
2519  ts->pkt = pkt;
2520  ret = handle_packets(ts, 0);
2521  if (ret < 0) {
2522  av_free_packet(ts->pkt);
2523  /* flush pes data left */
2524  for (i = 0; i < NB_PID_MAX; i++)
2525  if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2526  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2527  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2528  new_pes_packet(pes, pkt);
2529  pes->state = MPEGTS_SKIP;
2530  ret = 0;
2531  break;
2532  }
2533  }
2534  }
2535 
2536  if (!ret && pkt->size < 0)
2537  ret = AVERROR(EINTR);
2538  return ret;
2539 }
2540 
2541 static void mpegts_free(MpegTSContext *ts)
2542 {
2543  int i;
2544 
2545  clear_programs(ts);
2546 
2547  for (i = 0; i < NB_PID_MAX; i++)
2548  if (ts->pids[i])
2549  mpegts_close_filter(ts, ts->pids[i]);
2550 }
2551 
2553 {
2554  MpegTSContext *ts = s->priv_data;
2555  mpegts_free(ts);
2556  return 0;
2557 }
2558 
2559 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2560  int64_t *ppos, int64_t pos_limit)
2561 {
2562  MpegTSContext *ts = s->priv_data;
2563  int64_t pos, timestamp;
2565  int pcr_l, pcr_pid =
2566  ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2567  int pos47 = ts->pos47_full % ts->raw_packet_size;
2568  pos =
2569  ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2570  ts->raw_packet_size + pos47;
2571  while(pos < pos_limit) {
2572  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2573  return AV_NOPTS_VALUE;
2574  if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2575  return AV_NOPTS_VALUE;
2576  if (buf[0] != 0x47) {
2577  avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2578  if (mpegts_resync(s) < 0)
2579  return AV_NOPTS_VALUE;
2580  pos = avio_tell(s->pb);
2581  continue;
2582  }
2583  if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2584  parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2585  *ppos = pos;
2586  return timestamp;
2587  }
2588  pos += ts->raw_packet_size;
2589  }
2590 
2591  return AV_NOPTS_VALUE;
2592 }
2593 
2594 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2595  int64_t *ppos, int64_t pos_limit)
2596 {
2597  MpegTSContext *ts = s->priv_data;
2598  int64_t pos;
2599  int pos47 = ts->pos47_full % ts->raw_packet_size;
2600  pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2602  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2603  return AV_NOPTS_VALUE;
2604  while(pos < pos_limit) {
2605  int ret;
2606  AVPacket pkt;
2607  av_init_packet(&pkt);
2608  ret = av_read_frame(s, &pkt);
2609  if (ret < 0)
2610  return AV_NOPTS_VALUE;
2611  av_free_packet(&pkt);
2612  if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2613  ff_reduce_index(s, pkt.stream_index);
2614  av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2615  if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2616  *ppos = pkt.pos;
2617  return pkt.dts;
2618  }
2619  }
2620  pos = pkt.pos;
2621  }
2622 
2623  return AV_NOPTS_VALUE;
2624 }
2625 
2626 /**************************************************************/
2627 /* parsing functions - called from other demuxers such as RTP */
2628 
2630 {
2631  MpegTSContext *ts;
2632 
2633  ts = av_mallocz(sizeof(MpegTSContext));
2634  if (!ts)
2635  return NULL;
2636  /* no stream case, currently used by RTP */
2638  ts->stream = s;
2639  ts->auto_guess = 1;
2642 
2643  return ts;
2644 }
2645 
2646 /* return the consumed length if a packet was output, or -1 if no
2647  * packet is output */
2649  const uint8_t *buf, int len)
2650 {
2651  int len1;
2652 
2653  len1 = len;
2654  ts->pkt = pkt;
2655  for (;;) {
2656  ts->stop_parse = 0;
2657  if (len < TS_PACKET_SIZE)
2658  return AVERROR_INVALIDDATA;
2659  if (buf[0] != 0x47) {
2660  buf++;
2661  len--;
2662  } else {
2663  handle_packet(ts, buf);
2664  buf += TS_PACKET_SIZE;
2665  len -= TS_PACKET_SIZE;
2666  if (ts->stop_parse == 1)
2667  break;
2668  }
2669  }
2670  return len1 - len;
2671 }
2672 
2674 {
2675  mpegts_free(ts);
2676  av_free(ts);
2677 }
2678 
2679 AVInputFormat ff_mpegts_demuxer = {
2680  .name = "mpegts",
2681  .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2682  .priv_data_size = sizeof(MpegTSContext),
2687  .read_timestamp = mpegts_get_dts,
2689  .priv_class = &mpegts_class,
2690 };
2691 
2693  .name = "mpegtsraw",
2694  .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2695  .priv_data_size = sizeof(MpegTSContext),
2699  .read_timestamp = mpegts_get_dts,
2701  .priv_class = &mpegtsraw_class,
2702 };