FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
mpegts.c
Go to the documentation of this file.
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 
147 
148  /******************************************/
149  /* private mpegts data */
150  /* scan context */
151  /** structure to keep track of Program->pids mapping */
152  unsigned int nb_prg;
153  struct Program *prg;
154 
156  /** filters for various streams specified by PMT + for the PAT and PMT */
159 };
160 
161 #define MPEGTS_OPTIONS \
162  { "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 }
163 
164 static const AVOption options[] = {
166  {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
167  {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
168  {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
170  {"scan_all_pmts", "Scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_INT,
171  { .i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
172  {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
173  {.i64 = 0}, 0, 1, 0 },
174  {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
175  {.i64 = 0}, 0, 1, 0 },
176  { NULL },
177 };
178 
179 static const AVClass mpegts_class = {
180  .class_name = "mpegts demuxer",
181  .item_name = av_default_item_name,
182  .option = options,
183  .version = LIBAVUTIL_VERSION_INT,
184 };
185 
186 static const AVOption raw_options[] = {
188  { "compute_pcr", "Compute exact PCR for each transport stream packet.",
189  offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
190  { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
191  { "ts_packetsize", "Output option carrying the raw packet size.",
192  offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
193  { .i64 = 0 }, 0, 0,
195  { NULL },
196 };
197 
198 static const AVClass mpegtsraw_class = {
199  .class_name = "mpegtsraw demuxer",
200  .item_name = av_default_item_name,
201  .option = raw_options,
202  .version = LIBAVUTIL_VERSION_INT,
203 };
204 
205 /* TS stream handling */
206 
213 };
214 
215 /* enough for PES header + length */
216 #define PES_START_SIZE 6
217 #define PES_HEADER_SIZE 9
218 #define MAX_PES_HEADER_SIZE (9 + 255)
219 
220 typedef struct PESContext {
221  int pid;
222  int pcr_pid; /**< if -1 then all packets containing PCR are considered */
227  AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
229  /* used to get the format */
231  int flags; /**< copied to the AVPacket flags */
235  int64_t pts, dts;
236  int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
240 } PESContext;
241 
243 
244 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
245 {
246  int i;
247  for (i = 0; i < ts->nb_prg; i++) {
248  if (ts->prg[i].id == programid) {
249  return &ts->prg[i];
250  }
251  }
252  return NULL;
253 }
254 
255 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
256 {
257  AVProgram *prg = NULL;
258  int i;
259 
260  for (i = 0; i < ts->stream->nb_programs; i++)
261  if (ts->stream->programs[i]->id == programid) {
262  prg = ts->stream->programs[i];
263  break;
264  }
265  if (!prg)
266  return;
267  prg->nb_stream_indexes = 0;
268 }
269 
270 static void clear_program(MpegTSContext *ts, unsigned int programid)
271 {
272  int i;
273 
274  clear_avprogram(ts, programid);
275  for (i = 0; i < ts->nb_prg; i++)
276  if (ts->prg[i].id == programid) {
277  ts->prg[i].nb_pids = 0;
278  ts->prg[i].pmt_found = 0;
279  }
280 }
281 
283 {
284  av_freep(&ts->prg);
285  ts->nb_prg = 0;
286 }
287 
288 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
289 {
290  struct Program *p;
291  if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
292  ts->nb_prg = 0;
293  return;
294  }
295  p = &ts->prg[ts->nb_prg];
296  p->id = programid;
297  p->nb_pids = 0;
298  p->pmt_found = 0;
299  ts->nb_prg++;
300 }
301 
302 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
303  unsigned int pid)
304 {
305  struct Program *p = get_program(ts, programid);
306  int i;
307  if (!p)
308  return;
309 
310  if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
311  return;
312 
313  for (i = 0; i < p->nb_pids; i++)
314  if (p->pids[i] == pid)
315  return;
316 
317  p->pids[p->nb_pids++] = pid;
318 }
319 
320 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
321 {
322  struct Program *p = get_program(ts, programid);
323  if (!p)
324  return;
325 
326  p->pmt_found = 1;
327 }
328 
329 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
330 {
331  int i;
332  for (i = 0; i < s->nb_programs; i++) {
333  if (s->programs[i]->id == programid) {
334  s->programs[i]->pcr_pid = pid;
335  break;
336  }
337  }
338 }
339 
340 /**
341  * @brief discard_pid() decides if the pid is to be discarded according
342  * to caller's programs selection
343  * @param ts : - TS context
344  * @param pid : - pid
345  * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
346  * 0 otherwise
347  */
348 static int discard_pid(MpegTSContext *ts, unsigned int pid)
349 {
350  int i, j, k;
351  int used = 0, discarded = 0;
352  struct Program *p;
353 
354  /* If none of the programs have .discard=AVDISCARD_ALL then there's
355  * no way we have to discard this packet */
356  for (k = 0; k < ts->stream->nb_programs; k++)
357  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
358  break;
359  if (k == ts->stream->nb_programs)
360  return 0;
361 
362  for (i = 0; i < ts->nb_prg; i++) {
363  p = &ts->prg[i];
364  for (j = 0; j < p->nb_pids; j++) {
365  if (p->pids[j] != pid)
366  continue;
367  // is program with id p->id set to be discarded?
368  for (k = 0; k < ts->stream->nb_programs; k++) {
369  if (ts->stream->programs[k]->id == p->id) {
370  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
371  discarded++;
372  else
373  used++;
374  }
375  }
376  }
377  }
378 
379  return !used && discarded;
380 }
381 
382 /**
383  * Assemble PES packets out of TS packets, and then call the "section_cb"
384  * function when they are complete.
385  */
387  const uint8_t *buf, int buf_size, int is_start)
388 {
389  MpegTSSectionFilter *tss = &tss1->u.section_filter;
390  int len;
391 
392  if (is_start) {
393  memcpy(tss->section_buf, buf, buf_size);
394  tss->section_index = buf_size;
395  tss->section_h_size = -1;
396  tss->end_of_section_reached = 0;
397  } else {
398  if (tss->end_of_section_reached)
399  return;
400  len = 4096 - tss->section_index;
401  if (buf_size < len)
402  len = buf_size;
403  memcpy(tss->section_buf + tss->section_index, buf, len);
404  tss->section_index += len;
405  }
406 
407  /* compute section length if possible */
408  if (tss->section_h_size == -1 && tss->section_index >= 3) {
409  len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
410  if (len > 4096)
411  return;
412  tss->section_h_size = len;
413  }
414 
415  if (tss->section_h_size != -1 &&
416  tss->section_index >= tss->section_h_size) {
417  int crc_valid = 1;
418  tss->end_of_section_reached = 1;
419 
420  if (tss->check_crc) {
421  crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
422  if (crc_valid) {
423  ts->crc_validity[ tss1->pid ] = 100;
424  }else if (ts->crc_validity[ tss1->pid ] > -10) {
425  ts->crc_validity[ tss1->pid ]--;
426  }else
427  crc_valid = 2;
428  }
429  if (crc_valid)
430  tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
431  }
432 }
433 
434 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
435  enum MpegTSFilterType type)
436 {
438 
439  av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
440 
441  if (pid >= NB_PID_MAX || ts->pids[pid])
442  return NULL;
443  filter = av_mallocz(sizeof(MpegTSFilter));
444  if (!filter)
445  return NULL;
446  ts->pids[pid] = filter;
447 
448  filter->type = type;
449  filter->pid = pid;
450  filter->es_id = -1;
451  filter->last_cc = -1;
452  filter->last_pcr= -1;
453 
454  return filter;
455 }
456 
458  unsigned int pid,
459  SectionCallback *section_cb,
460  void *opaque,
461  int check_crc)
462 {
464  MpegTSSectionFilter *sec;
465 
466  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
467  return NULL;
468  sec = &filter->u.section_filter;
469  sec->section_cb = section_cb;
470  sec->opaque = opaque;
472  sec->check_crc = check_crc;
473  if (!sec->section_buf) {
474  av_free(filter);
475  return NULL;
476  }
477  return filter;
478 }
479 
480 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
481  PESCallback *pes_cb,
482  void *opaque)
483 {
485  MpegTSPESFilter *pes;
486 
487  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
488  return NULL;
489 
490  pes = &filter->u.pes_filter;
491  pes->pes_cb = pes_cb;
492  pes->opaque = opaque;
493  return filter;
494 }
495 
496 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
497 {
498  return mpegts_open_filter(ts, pid, MPEGTS_PCR);
499 }
500 
502 {
503  int pid;
504 
505  pid = filter->pid;
506  if (filter->type == MPEGTS_SECTION)
508  else if (filter->type == MPEGTS_PES) {
509  PESContext *pes = filter->u.pes_filter.opaque;
510  av_buffer_unref(&pes->buffer);
511  /* referenced private data will be freed later in
512  * avformat_close_input */
513  if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
514  av_freep(&filter->u.pes_filter.opaque);
515  }
516  }
517 
518  av_free(filter);
519  ts->pids[pid] = NULL;
520 }
521 
522 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
523 {
524  int stat[TS_MAX_PACKET_SIZE];
525  int stat_all = 0;
526  int i;
527  int best_score = 0;
528 
529  memset(stat, 0, packet_size * sizeof(*stat));
530 
531  for (i = 0; i < size - 3; i++) {
532  if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
533  int x = i % packet_size;
534  stat[x]++;
535  stat_all++;
536  if (stat[x] > best_score) {
537  best_score = stat[x];
538  if (index)
539  *index = x;
540  }
541  }
542  }
543 
544  return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
545 }
546 
547 /* autodetect fec presence. Must have at least 1024 bytes */
548 static int get_packet_size(const uint8_t *buf, int size)
549 {
550  int score, fec_score, dvhs_score;
551 
552  if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
553  return AVERROR_INVALIDDATA;
554 
555  score = analyze(buf, size, TS_PACKET_SIZE, NULL);
556  dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
557  fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
558  av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
559  score, dvhs_score, fec_score);
560 
561  if (score > fec_score && score > dvhs_score)
562  return TS_PACKET_SIZE;
563  else if (dvhs_score > score && dvhs_score > fec_score)
564  return TS_DVHS_PACKET_SIZE;
565  else if (score < fec_score && dvhs_score < fec_score)
566  return TS_FEC_PACKET_SIZE;
567  else
568  return AVERROR_INVALIDDATA;
569 }
570 
571 typedef struct SectionHeader {
573  uint16_t id;
577 } SectionHeader;
578 
579 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
580 {
581  const uint8_t *p;
582  int c;
583 
584  p = *pp;
585  if (p >= p_end)
586  return AVERROR_INVALIDDATA;
587  c = *p++;
588  *pp = p;
589  return c;
590 }
591 
592 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
593 {
594  const uint8_t *p;
595  int c;
596 
597  p = *pp;
598  if ((p + 1) >= p_end)
599  return AVERROR_INVALIDDATA;
600  c = AV_RB16(p);
601  p += 2;
602  *pp = p;
603  return c;
604 }
605 
606 /* read and allocate a DVB string preceded by its length */
607 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
608 {
609  int len;
610  const uint8_t *p;
611  char *str;
612 
613  p = *pp;
614  len = get8(&p, p_end);
615  if (len < 0)
616  return NULL;
617  if ((p + len) > p_end)
618  return NULL;
619  str = av_malloc(len + 1);
620  if (!str)
621  return NULL;
622  memcpy(str, p, len);
623  str[len] = '\0';
624  p += len;
625  *pp = p;
626  return str;
627 }
628 
630  const uint8_t **pp, const uint8_t *p_end)
631 {
632  int val;
633 
634  val = get8(pp, p_end);
635  if (val < 0)
636  return val;
637  h->tid = val;
638  *pp += 2;
639  val = get16(pp, p_end);
640  if (val < 0)
641  return val;
642  h->id = val;
643  val = get8(pp, p_end);
644  if (val < 0)
645  return val;
646  h->version = (val >> 1) & 0x1f;
647  val = get8(pp, p_end);
648  if (val < 0)
649  return val;
650  h->sec_num = val;
651  val = get8(pp, p_end);
652  if (val < 0)
653  return val;
654  h->last_sec_num = val;
655  return 0;
656 }
657 
658 typedef struct {
659  uint32_t stream_type;
662 } StreamType;
663 
664 static const StreamType ISO_types[] = {
671  /* Makito encoder sets stream type 0x11 for AAC,
672  * so auto-detect LOAS/LATM instead of hardcoding it. */
673 #if !CONFIG_LOAS_DEMUXER
674  { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
675 #endif
681  { 0 },
682 };
683 
684 static const StreamType HDMV_types[] = {
690  { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
691  { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
692  { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
693  { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
695  { 0 },
696 };
697 
698 /* ATSC ? */
699 static const StreamType MISC_types[] = {
702  { 0 },
703 };
704 
705 static const StreamType REGD_types[] = {
706  { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
707  { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
708  { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
709  { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
710  { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
711  { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
712  { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
713  { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
714  { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
715  { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
716  { 0 },
717 };
718 
719 static const StreamType METADATA_types[] = {
720  { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
721  { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
722  { 0 },
723 };
724 
725 /* descriptor present */
726 static const StreamType DESC_types[] = {
727  { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
728  { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
731  { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
732  { 0 },
733 };
734 
736  uint32_t stream_type,
737  const StreamType *types)
738 {
739  if (avcodec_is_open(st->codec)) {
740  av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
741  return;
742  }
743 
744  for (; types->stream_type; types++)
745  if (stream_type == types->stream_type) {
746  st->codec->codec_type = types->codec_type;
747  st->codec->codec_id = types->codec_id;
748  st->request_probe = 0;
749  return;
750  }
751 }
752 
754  uint32_t stream_type, uint32_t prog_reg_desc)
755 {
756  int old_codec_type = st->codec->codec_type;
757  int old_codec_id = st->codec->codec_id;
758 
759  if (avcodec_is_open(st->codec)) {
760  av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
761  return 0;
762  }
763 
764  avpriv_set_pts_info(st, 33, 1, 90000);
765  st->priv_data = pes;
769  pes->st = st;
770  pes->stream_type = stream_type;
771 
772  av_log(pes->stream, AV_LOG_DEBUG,
773  "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
774  st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
775 
776  st->codec->codec_tag = pes->stream_type;
777 
778  mpegts_find_stream_type(st, pes->stream_type, ISO_types);
779  if ((prog_reg_desc == AV_RL32("HDMV") ||
780  prog_reg_desc == AV_RL32("HDPR")) &&
781  st->codec->codec_id == AV_CODEC_ID_NONE) {
782  mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
783  if (pes->stream_type == 0x83) {
784  // HDMV TrueHD streams also contain an AC3 coded version of the
785  // audio track - add a second stream for this
786  AVStream *sub_st;
787  // priv_data cannot be shared between streams
788  PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
789  if (!sub_pes)
790  return AVERROR(ENOMEM);
791  memcpy(sub_pes, pes, sizeof(*sub_pes));
792 
793  sub_st = avformat_new_stream(pes->stream, NULL);
794  if (!sub_st) {
795  av_free(sub_pes);
796  return AVERROR(ENOMEM);
797  }
798 
799  sub_st->id = pes->pid;
800  avpriv_set_pts_info(sub_st, 33, 1, 90000);
801  sub_st->priv_data = sub_pes;
803  sub_st->codec->codec_id = AV_CODEC_ID_AC3;
805  sub_pes->sub_st = pes->sub_st = sub_st;
806  }
807  }
808  if (st->codec->codec_id == AV_CODEC_ID_NONE)
809  mpegts_find_stream_type(st, pes->stream_type, MISC_types);
810  if (st->codec->codec_id == AV_CODEC_ID_NONE) {
811  st->codec->codec_id = old_codec_id;
812  st->codec->codec_type = old_codec_type;
813  }
814 
815  return 0;
816 }
817 
819 {
820  pes->pts = AV_NOPTS_VALUE;
821  pes->dts = AV_NOPTS_VALUE;
822  pes->data_index = 0;
823  pes->flags = 0;
824  av_buffer_unref(&pes->buffer);
825 }
826 
828 {
829  av_init_packet(pkt);
830 
831  pkt->buf = pes->buffer;
832  pkt->data = pes->buffer->data;
833  pkt->size = pes->data_index;
834 
835  if (pes->total_size != MAX_PES_PAYLOAD &&
836  pes->pes_header_size + pes->data_index != pes->total_size +
837  PES_START_SIZE) {
838  av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
839  pes->flags |= AV_PKT_FLAG_CORRUPT;
840  }
841  memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
842 
843  // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
844  if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
845  pkt->stream_index = pes->sub_st->index;
846  else
847  pkt->stream_index = pes->st->index;
848  pkt->pts = pes->pts;
849  pkt->dts = pes->dts;
850  /* store position of first TS packet of this PES packet */
851  pkt->pos = pes->ts_packet_pos;
852  pkt->flags = pes->flags;
853 
854  pes->buffer = NULL;
856 }
857 
858 static uint64_t get_ts64(GetBitContext *gb, int bits)
859 {
860  if (get_bits_left(gb) < bits)
861  return AV_NOPTS_VALUE;
862  return get_bits64(gb, bits);
863 }
864 
866  const uint8_t *buf, int buf_size)
867 {
868  GetBitContext gb;
869  int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
870  int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
871  int dts_flag = -1, cts_flag = -1;
872  int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
873  uint8_t buf_padded[128 + FF_INPUT_BUFFER_PADDING_SIZE];
874  int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - FF_INPUT_BUFFER_PADDING_SIZE);
875 
876  memcpy(buf_padded, buf, buf_padded_size);
877 
878  init_get_bits(&gb, buf_padded, buf_padded_size * 8);
879 
880  if (sl->use_au_start)
881  au_start_flag = get_bits1(&gb);
882  if (sl->use_au_end)
883  au_end_flag = get_bits1(&gb);
884  if (!sl->use_au_start && !sl->use_au_end)
885  au_start_flag = au_end_flag = 1;
886  if (sl->ocr_len > 0)
887  ocr_flag = get_bits1(&gb);
888  if (sl->use_idle)
889  idle_flag = get_bits1(&gb);
890  if (sl->use_padding)
891  padding_flag = get_bits1(&gb);
892  if (padding_flag)
893  padding_bits = get_bits(&gb, 3);
894 
895  if (!idle_flag && (!padding_flag || padding_bits != 0)) {
896  if (sl->packet_seq_num_len)
898  if (sl->degr_prior_len)
899  if (get_bits1(&gb))
900  skip_bits(&gb, sl->degr_prior_len);
901  if (ocr_flag)
902  skip_bits_long(&gb, sl->ocr_len);
903  if (au_start_flag) {
904  if (sl->use_rand_acc_pt)
905  get_bits1(&gb);
906  if (sl->au_seq_num_len > 0)
907  skip_bits_long(&gb, sl->au_seq_num_len);
908  if (sl->use_timestamps) {
909  dts_flag = get_bits1(&gb);
910  cts_flag = get_bits1(&gb);
911  }
912  }
913  if (sl->inst_bitrate_len)
914  inst_bitrate_flag = get_bits1(&gb);
915  if (dts_flag == 1)
916  dts = get_ts64(&gb, sl->timestamp_len);
917  if (cts_flag == 1)
918  cts = get_ts64(&gb, sl->timestamp_len);
919  if (sl->au_len > 0)
920  skip_bits_long(&gb, sl->au_len);
921  if (inst_bitrate_flag)
923  }
924 
925  if (dts != AV_NOPTS_VALUE)
926  pes->dts = dts;
927  if (cts != AV_NOPTS_VALUE)
928  pes->pts = cts;
929 
930  if (sl->timestamp_len && sl->timestamp_res)
932 
933  return (get_bits_count(&gb) + 7) >> 3;
934 }
935 
936 /* return non zero if a packet could be constructed */
938  const uint8_t *buf, int buf_size, int is_start,
939  int64_t pos)
940 {
941  PESContext *pes = filter->u.pes_filter.opaque;
942  MpegTSContext *ts = pes->ts;
943  const uint8_t *p;
944  int len, code;
945 
946  if (!ts->pkt)
947  return 0;
948 
949  if (is_start) {
950  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
951  new_pes_packet(pes, ts->pkt);
952  ts->stop_parse = 1;
953  } else {
955  }
956  pes->state = MPEGTS_HEADER;
957  pes->ts_packet_pos = pos;
958  }
959  p = buf;
960  while (buf_size > 0) {
961  switch (pes->state) {
962  case MPEGTS_HEADER:
963  len = PES_START_SIZE - pes->data_index;
964  if (len > buf_size)
965  len = buf_size;
966  memcpy(pes->header + pes->data_index, p, len);
967  pes->data_index += len;
968  p += len;
969  buf_size -= len;
970  if (pes->data_index == PES_START_SIZE) {
971  /* we got all the PES or section header. We can now
972  * decide */
973  if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
974  pes->header[2] == 0x01) {
975  /* it must be an mpeg2 PES stream */
976  code = pes->header[3] | 0x100;
977  av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
978  code);
979 
980  if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
981  (!pes->sub_st ||
982  pes->sub_st->discard == AVDISCARD_ALL)) ||
983  code == 0x1be) /* padding_stream */
984  goto skip;
985 
986  /* stream not present in PMT */
987  if (!pes->st) {
988  if (ts->skip_changes)
989  goto skip;
990 
991  pes->st = avformat_new_stream(ts->stream, NULL);
992  if (!pes->st)
993  return AVERROR(ENOMEM);
994  pes->st->id = pes->pid;
995  mpegts_set_stream_info(pes->st, pes, 0, 0);
996  }
997 
998  pes->total_size = AV_RB16(pes->header + 4);
999  /* NOTE: a zero total size means the PES size is
1000  * unbounded */
1001  if (!pes->total_size)
1002  pes->total_size = MAX_PES_PAYLOAD;
1003 
1004  /* allocate pes buffer */
1005  pes->buffer = av_buffer_alloc(pes->total_size +
1007  if (!pes->buffer)
1008  return AVERROR(ENOMEM);
1009 
1010  if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1011  code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1012  code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1013  code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1014  pes->state = MPEGTS_PESHEADER;
1015  if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1016  av_dlog(pes->stream,
1017  "pid=%x stream_type=%x probing\n",
1018  pes->pid,
1019  pes->stream_type);
1020  pes->st->request_probe = 1;
1021  }
1022  } else {
1023  pes->state = MPEGTS_PAYLOAD;
1024  pes->data_index = 0;
1025  }
1026  } else {
1027  /* otherwise, it should be a table */
1028  /* skip packet */
1029 skip:
1030  pes->state = MPEGTS_SKIP;
1031  continue;
1032  }
1033  }
1034  break;
1035  /**********************************************/
1036  /* PES packing parsing */
1037  case MPEGTS_PESHEADER:
1038  len = PES_HEADER_SIZE - pes->data_index;
1039  if (len < 0)
1040  return AVERROR_INVALIDDATA;
1041  if (len > buf_size)
1042  len = buf_size;
1043  memcpy(pes->header + pes->data_index, p, len);
1044  pes->data_index += len;
1045  p += len;
1046  buf_size -= len;
1047  if (pes->data_index == PES_HEADER_SIZE) {
1048  pes->pes_header_size = pes->header[8] + 9;
1050  }
1051  break;
1052  case MPEGTS_PESHEADER_FILL:
1053  len = pes->pes_header_size - pes->data_index;
1054  if (len < 0)
1055  return AVERROR_INVALIDDATA;
1056  if (len > buf_size)
1057  len = buf_size;
1058  memcpy(pes->header + pes->data_index, p, len);
1059  pes->data_index += len;
1060  p += len;
1061  buf_size -= len;
1062  if (pes->data_index == pes->pes_header_size) {
1063  const uint8_t *r;
1064  unsigned int flags, pes_ext, skip;
1065 
1066  flags = pes->header[7];
1067  r = pes->header + 9;
1068  pes->pts = AV_NOPTS_VALUE;
1069  pes->dts = AV_NOPTS_VALUE;
1070  if ((flags & 0xc0) == 0x80) {
1071  pes->dts = pes->pts = ff_parse_pes_pts(r);
1072  r += 5;
1073  } else if ((flags & 0xc0) == 0xc0) {
1074  pes->pts = ff_parse_pes_pts(r);
1075  r += 5;
1076  pes->dts = ff_parse_pes_pts(r);
1077  r += 5;
1078  }
1079  pes->extended_stream_id = -1;
1080  if (flags & 0x01) { /* PES extension */
1081  pes_ext = *r++;
1082  /* Skip PES private data, program packet sequence counter and P-STD buffer */
1083  skip = (pes_ext >> 4) & 0xb;
1084  skip += skip & 0x9;
1085  r += skip;
1086  if ((pes_ext & 0x41) == 0x01 &&
1087  (r + 2) <= (pes->header + pes->pes_header_size)) {
1088  /* PES extension 2 */
1089  if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1090  pes->extended_stream_id = r[1];
1091  }
1092  }
1093 
1094  /* we got the full header. We parse it and get the payload */
1095  pes->state = MPEGTS_PAYLOAD;
1096  pes->data_index = 0;
1097  if (pes->stream_type == 0x12 && buf_size > 0) {
1098  int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1099  buf_size);
1100  pes->pes_header_size += sl_header_bytes;
1101  p += sl_header_bytes;
1102  buf_size -= sl_header_bytes;
1103  }
1104  if (pes->stream_type == 0x15 && buf_size >= 5) {
1105  /* skip metadata access unit header */
1106  pes->pes_header_size += 5;
1107  p += 5;
1108  buf_size -= 5;
1109  }
1110  if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1111  AVProgram *p = NULL;
1112  while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1113  if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1114  MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1115  if (f) {
1116  AVStream *st = NULL;
1117  if (f->type == MPEGTS_PES) {
1118  PESContext *pcrpes = f->u.pes_filter.opaque;
1119  if (pcrpes)
1120  st = pcrpes->st;
1121  } else if (f->type == MPEGTS_PCR) {
1122  int i;
1123  for (i = 0; i < p->nb_stream_indexes; i++) {
1124  AVStream *pst = pes->stream->streams[p->stream_index[i]];
1125  if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1126  st = pst;
1127  }
1128  }
1129  if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1130  // teletext packets do not always have correct timestamps,
1131  // the standard says they should be handled after 40.6 ms at most,
1132  // and the pcr error to this packet should be no more than 100 ms.
1133  // TODO: we should interpolate the PCR, not just use the last one
1134  int64_t pcr = f->last_pcr / 300;
1137  if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1138  pes->pts = pes->dts = pcr;
1139  } else if (pes->dts > pcr + 3654 + 9000) {
1140  pes->pts = pes->dts = pcr + 3654 + 9000;
1141  }
1142  break;
1143  }
1144  }
1145  }
1146  }
1147  }
1148  }
1149  break;
1150  case MPEGTS_PAYLOAD:
1151  if (pes->buffer) {
1152  if (pes->data_index > 0 &&
1153  pes->data_index + buf_size > pes->total_size) {
1154  new_pes_packet(pes, ts->pkt);
1155  pes->total_size = MAX_PES_PAYLOAD;
1156  pes->buffer = av_buffer_alloc(pes->total_size +
1158  if (!pes->buffer)
1159  return AVERROR(ENOMEM);
1160  ts->stop_parse = 1;
1161  } else if (pes->data_index == 0 &&
1162  buf_size > pes->total_size) {
1163  // pes packet size is < ts size packet and pes data is padded with 0xff
1164  // not sure if this is legal in ts but see issue #2392
1165  buf_size = pes->total_size;
1166  }
1167  memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1168  pes->data_index += buf_size;
1169  /* emit complete packets with known packet size
1170  * decreases demuxer delay for infrequent packets like subtitles from
1171  * a couple of seconds to milliseconds for properly muxed files.
1172  * total_size is the number of bytes following pes_packet_length
1173  * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1174  if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1175  pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1176  ts->stop_parse = 1;
1177  new_pes_packet(pes, ts->pkt);
1178  }
1179  }
1180  buf_size = 0;
1181  break;
1182  case MPEGTS_SKIP:
1183  buf_size = 0;
1184  break;
1185  }
1186  }
1187 
1188  return 0;
1189 }
1190 
1191 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1192 {
1193  MpegTSFilter *tss;
1194  PESContext *pes;
1195 
1196  /* if no pid found, then add a pid context */
1197  pes = av_mallocz(sizeof(PESContext));
1198  if (!pes)
1199  return 0;
1200  pes->ts = ts;
1201  pes->stream = ts->stream;
1202  pes->pid = pid;
1203  pes->pcr_pid = pcr_pid;
1204  pes->state = MPEGTS_SKIP;
1205  pes->pts = AV_NOPTS_VALUE;
1206  pes->dts = AV_NOPTS_VALUE;
1207  tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1208  if (!tss) {
1209  av_free(pes);
1210  return 0;
1211  }
1212  return pes;
1213 }
1214 
1215 #define MAX_LEVEL 4
1216 typedef struct {
1223  int level;
1226 
1228  const uint8_t *buf, unsigned size,
1229  Mp4Descr *descr, int max_descr_count)
1230 {
1231  int ret;
1232  if (size > (1 << 30))
1233  return AVERROR_INVALIDDATA;
1234 
1235  if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1236  NULL, NULL, NULL, NULL)) < 0)
1237  return ret;
1238 
1239  d->s = s;
1240  d->level = 0;
1241  d->descr_count = 0;
1242  d->descr = descr;
1243  d->active_descr = NULL;
1244  d->max_descr_count = max_descr_count;
1245 
1246  return 0;
1247 }
1248 
1249 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1250 {
1251  int64_t new_off = avio_tell(pb);
1252  (*len) -= new_off - *off;
1253  *off = new_off;
1254 }
1255 
1256 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1257  int target_tag);
1258 
1259 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1260 {
1261  while (len > 0) {
1262  int ret = parse_mp4_descr(d, off, len, 0);
1263  if (ret < 0)
1264  return ret;
1265  update_offsets(&d->pb, &off, &len);
1266  }
1267  return 0;
1268 }
1269 
1270 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1271 {
1272  avio_rb16(&d->pb); // ID
1273  avio_r8(&d->pb);
1274  avio_r8(&d->pb);
1275  avio_r8(&d->pb);
1276  avio_r8(&d->pb);
1277  avio_r8(&d->pb);
1278  update_offsets(&d->pb, &off, &len);
1279  return parse_mp4_descr_arr(d, off, len);
1280 }
1281 
1282 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1283 {
1284  int id_flags;
1285  if (len < 2)
1286  return 0;
1287  id_flags = avio_rb16(&d->pb);
1288  if (!(id_flags & 0x0020)) { // URL_Flag
1289  update_offsets(&d->pb, &off, &len);
1290  return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1291  } else {
1292  return 0;
1293  }
1294 }
1295 
1296 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1297 {
1298  int es_id = 0;
1299  if (d->descr_count >= d->max_descr_count)
1300  return AVERROR_INVALIDDATA;
1301  ff_mp4_parse_es_descr(&d->pb, &es_id);
1302  d->active_descr = d->descr + (d->descr_count++);
1303 
1304  d->active_descr->es_id = es_id;
1305  update_offsets(&d->pb, &off, &len);
1306  parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1307  update_offsets(&d->pb, &off, &len);
1308  if (len > 0)
1309  parse_mp4_descr(d, off, len, MP4SLDescrTag);
1310  d->active_descr = NULL;
1311  return 0;
1312 }
1313 
1315  int len)
1316 {
1317  Mp4Descr *descr = d->active_descr;
1318  if (!descr)
1319  return AVERROR_INVALIDDATA;
1321  if (!descr->dec_config_descr)
1322  return AVERROR(ENOMEM);
1323  descr->dec_config_descr_len = len;
1324  avio_read(&d->pb, descr->dec_config_descr, len);
1325  return 0;
1326 }
1327 
1328 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1329 {
1330  Mp4Descr *descr = d->active_descr;
1331  int predefined;
1332  if (!descr)
1333  return AVERROR_INVALIDDATA;
1334 
1335  predefined = avio_r8(&d->pb);
1336  if (!predefined) {
1337  int lengths;
1338  int flags = avio_r8(&d->pb);
1339  descr->sl.use_au_start = !!(flags & 0x80);
1340  descr->sl.use_au_end = !!(flags & 0x40);
1341  descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1342  descr->sl.use_padding = !!(flags & 0x08);
1343  descr->sl.use_timestamps = !!(flags & 0x04);
1344  descr->sl.use_idle = !!(flags & 0x02);
1345  descr->sl.timestamp_res = avio_rb32(&d->pb);
1346  avio_rb32(&d->pb);
1347  descr->sl.timestamp_len = avio_r8(&d->pb);
1348  if (descr->sl.timestamp_len > 64) {
1349  avpriv_request_sample(NULL, "timestamp_len > 64");
1350  descr->sl.timestamp_len = 64;
1351  return AVERROR_PATCHWELCOME;
1352  }
1353  descr->sl.ocr_len = avio_r8(&d->pb);
1354  descr->sl.au_len = avio_r8(&d->pb);
1355  descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1356  lengths = avio_rb16(&d->pb);
1357  descr->sl.degr_prior_len = lengths >> 12;
1358  descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1359  descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1360  } else if (!d->predefined_SLConfigDescriptor_seen){
1361  avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1363  }
1364  return 0;
1365 }
1366 
1367 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1368  int target_tag)
1369 {
1370  int tag;
1371  int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1372  update_offsets(&d->pb, &off, &len);
1373  if (len < 0 || len1 > len || len1 <= 0) {
1374  av_log(d->s, AV_LOG_ERROR,
1375  "Tag %x length violation new length %d bytes remaining %d\n",
1376  tag, len1, len);
1377  return AVERROR_INVALIDDATA;
1378  }
1379 
1380  if (d->level++ >= MAX_LEVEL) {
1381  av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1382  goto done;
1383  }
1384 
1385  if (target_tag && tag != target_tag) {
1386  av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1387  target_tag);
1388  goto done;
1389  }
1390 
1391  switch (tag) {
1392  case MP4IODescrTag:
1393  parse_MP4IODescrTag(d, off, len1);
1394  break;
1395  case MP4ODescrTag:
1396  parse_MP4ODescrTag(d, off, len1);
1397  break;
1398  case MP4ESDescrTag:
1399  parse_MP4ESDescrTag(d, off, len1);
1400  break;
1401  case MP4DecConfigDescrTag:
1402  parse_MP4DecConfigDescrTag(d, off, len1);
1403  break;
1404  case MP4SLDescrTag:
1405  parse_MP4SLDescrTag(d, off, len1);
1406  break;
1407  }
1408 
1409 
1410 done:
1411  d->level--;
1412  avio_seek(&d->pb, off + len1, SEEK_SET);
1413  return 0;
1414 }
1415 
1416 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1417  Mp4Descr *descr, int *descr_count, int max_descr_count)
1418 {
1420  int ret;
1421 
1422  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1423  if (ret < 0)
1424  return ret;
1425 
1426  ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1427 
1428  *descr_count = d.descr_count;
1429  return ret;
1430 }
1431 
1432 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1433  Mp4Descr *descr, int *descr_count, int max_descr_count)
1434 {
1436  int ret;
1437 
1438  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1439  if (ret < 0)
1440  return ret;
1441 
1442  ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1443 
1444  *descr_count = d.descr_count;
1445  return ret;
1446 }
1447 
1449  int section_len)
1450 {
1451  MpegTSContext *ts = filter->u.section_filter.opaque;
1452  SectionHeader h;
1453  const uint8_t *p, *p_end;
1454  AVIOContext pb;
1455  int mp4_descr_count = 0;
1456  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1457  int i, pid;
1458  AVFormatContext *s = ts->stream;
1459 
1460  p_end = section + section_len - 4;
1461  p = section;
1462  if (parse_section_header(&h, &p, p_end) < 0)
1463  return;
1464  if (h.tid != M4OD_TID)
1465  return;
1466 
1467  mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1469 
1470  for (pid = 0; pid < NB_PID_MAX; pid++) {
1471  if (!ts->pids[pid])
1472  continue;
1473  for (i = 0; i < mp4_descr_count; i++) {
1474  PESContext *pes;
1475  AVStream *st;
1476  if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1477  continue;
1478  if (ts->pids[pid]->type != MPEGTS_PES) {
1479  av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1480  continue;
1481  }
1482  pes = ts->pids[pid]->u.pes_filter.opaque;
1483  st = pes->st;
1484  if (!st)
1485  continue;
1486 
1487  pes->sl = mp4_descr[i].sl;
1488 
1489  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1490  mp4_descr[i].dec_config_descr_len, 0,
1491  NULL, NULL, NULL, NULL);
1492  ff_mp4_read_dec_config_descr(s, st, &pb);
1493  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1494  st->codec->extradata_size > 0)
1495  st->need_parsing = 0;
1496  if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1497  st->codec->extradata_size > 0)
1498  st->need_parsing = 0;
1499 
1500  if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1501  // do nothing
1502  } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1504  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1506  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1508  }
1509  }
1510  for (i = 0; i < mp4_descr_count; i++)
1511  av_free(mp4_descr[i].dec_config_descr);
1512 }
1513 
1515  1, 0, 1, 1, 2, 2, 2, 3, 3
1516 };
1517 
1518 static const uint8_t opus_channel_map[8][8] = {
1519  { 0 },
1520  { 0,1 },
1521  { 0,2,1 },
1522  { 0,1,2,3 },
1523  { 0,4,1,2,3 },
1524  { 0,4,1,2,3,5 },
1525  { 0,4,1,2,3,5,6 },
1526  { 0,6,1,2,3,4,5,7 },
1527 };
1528 
1530  const uint8_t **pp, const uint8_t *desc_list_end,
1531  Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1532  MpegTSContext *ts)
1533 {
1534  const uint8_t *desc_end;
1535  int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1536  char language[252];
1537  int i;
1538 
1539  desc_tag = get8(pp, desc_list_end);
1540  if (desc_tag < 0)
1541  return AVERROR_INVALIDDATA;
1542  desc_len = get8(pp, desc_list_end);
1543  if (desc_len < 0)
1544  return AVERROR_INVALIDDATA;
1545  desc_end = *pp + desc_len;
1546  if (desc_end > desc_list_end)
1547  return AVERROR_INVALIDDATA;
1548 
1549  av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1550 
1551  if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1552  stream_type == STREAM_TYPE_PRIVATE_DATA)
1553  mpegts_find_stream_type(st, desc_tag, DESC_types);
1554 
1555  switch (desc_tag) {
1556  case 0x1E: /* SL descriptor */
1557  desc_es_id = get16(pp, desc_end);
1558  if (desc_es_id < 0)
1559  break;
1560  if (ts && ts->pids[pid])
1561  ts->pids[pid]->es_id = desc_es_id;
1562  for (i = 0; i < mp4_descr_count; i++)
1563  if (mp4_descr[i].dec_config_descr_len &&
1564  mp4_descr[i].es_id == desc_es_id) {
1565  AVIOContext pb;
1566  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1567  mp4_descr[i].dec_config_descr_len, 0,
1568  NULL, NULL, NULL, NULL);
1569  ff_mp4_read_dec_config_descr(fc, st, &pb);
1570  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1571  st->codec->extradata_size > 0)
1572  st->need_parsing = 0;
1574  mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1575  }
1576  break;
1577  case 0x1F: /* FMC descriptor */
1578  if (get16(pp, desc_end) < 0)
1579  break;
1580  if (mp4_descr_count > 0 &&
1581  (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1582  mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1583  AVIOContext pb;
1584  ffio_init_context(&pb, mp4_descr->dec_config_descr,
1585  mp4_descr->dec_config_descr_len, 0,
1586  NULL, NULL, NULL, NULL);
1587  ff_mp4_read_dec_config_descr(fc, st, &pb);
1588  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1589  st->codec->extradata_size > 0) {
1590  st->request_probe = st->need_parsing = 0;
1592  }
1593  }
1594  break;
1595  case 0x56: /* DVB teletext descriptor */
1596  {
1597  uint8_t *extradata = NULL;
1598  int language_count = desc_len / 5;
1599 
1600  if (desc_len > 0 && desc_len % 5 != 0)
1601  return AVERROR_INVALIDDATA;
1602 
1603  if (language_count > 0) {
1604  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1605  if (language_count > sizeof(language) / 4) {
1606  language_count = sizeof(language) / 4;
1607  }
1608 
1609  if (st->codec->extradata == NULL) {
1610  if (ff_alloc_extradata(st->codec, language_count * 2)) {
1611  return AVERROR(ENOMEM);
1612  }
1613  }
1614 
1615  if (st->codec->extradata_size < language_count * 2)
1616  return AVERROR_INVALIDDATA;
1617 
1618  extradata = st->codec->extradata;
1619 
1620  for (i = 0; i < language_count; i++) {
1621  language[i * 4 + 0] = get8(pp, desc_end);
1622  language[i * 4 + 1] = get8(pp, desc_end);
1623  language[i * 4 + 2] = get8(pp, desc_end);
1624  language[i * 4 + 3] = ',';
1625 
1626  memcpy(extradata, *pp, 2);
1627  extradata += 2;
1628 
1629  *pp += 2;
1630  }
1631 
1632  language[i * 4 - 1] = 0;
1633  av_dict_set(&st->metadata, "language", language, 0);
1634  }
1635  }
1636  break;
1637  case 0x59: /* subtitling descriptor */
1638  {
1639  /* 8 bytes per DVB subtitle substream data:
1640  * ISO_639_language_code (3 bytes),
1641  * subtitling_type (1 byte),
1642  * composition_page_id (2 bytes),
1643  * ancillary_page_id (2 bytes) */
1644  int language_count = desc_len / 8;
1645 
1646  if (desc_len > 0 && desc_len % 8 != 0)
1647  return AVERROR_INVALIDDATA;
1648 
1649  if (language_count > 1) {
1650  avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1651  }
1652 
1653  if (language_count > 0) {
1654  uint8_t *extradata;
1655 
1656  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1657  if (language_count > sizeof(language) / 4) {
1658  language_count = sizeof(language) / 4;
1659  }
1660 
1661  if (st->codec->extradata == NULL) {
1662  if (ff_alloc_extradata(st->codec, language_count * 5)) {
1663  return AVERROR(ENOMEM);
1664  }
1665  }
1666 
1667  if (st->codec->extradata_size < language_count * 5)
1668  return AVERROR_INVALIDDATA;
1669 
1670  extradata = st->codec->extradata;
1671 
1672  for (i = 0; i < language_count; i++) {
1673  language[i * 4 + 0] = get8(pp, desc_end);
1674  language[i * 4 + 1] = get8(pp, desc_end);
1675  language[i * 4 + 2] = get8(pp, desc_end);
1676  language[i * 4 + 3] = ',';
1677 
1678  /* hearing impaired subtitles detection using subtitling_type */
1679  switch (*pp[0]) {
1680  case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1681  case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1682  case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1683  case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1684  case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1685  case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1687  break;
1688  }
1689 
1690  extradata[4] = get8(pp, desc_end); /* subtitling_type */
1691  memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1692  extradata += 5;
1693 
1694  *pp += 4;
1695  }
1696 
1697  language[i * 4 - 1] = 0;
1698  av_dict_set(&st->metadata, "language", language, 0);
1699  }
1700  }
1701  break;
1702  case 0x0a: /* ISO 639 language descriptor */
1703  for (i = 0; i + 4 <= desc_len; i += 4) {
1704  language[i + 0] = get8(pp, desc_end);
1705  language[i + 1] = get8(pp, desc_end);
1706  language[i + 2] = get8(pp, desc_end);
1707  language[i + 3] = ',';
1708  switch (get8(pp, desc_end)) {
1709  case 0x01:
1711  break;
1712  case 0x02:
1714  break;
1715  case 0x03:
1717  break;
1718  }
1719  }
1720  if (i && language[0]) {
1721  language[i - 1] = 0;
1722  av_dict_set(&st->metadata, "language", language, 0);
1723  }
1724  break;
1725  case 0x05: /* registration descriptor */
1726  st->codec->codec_tag = bytestream_get_le32(pp);
1727  av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1728  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1729  mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1730  break;
1731  case 0x52: /* stream identifier descriptor */
1732  st->stream_identifier = 1 + get8(pp, desc_end);
1733  break;
1734  case 0x26: /* metadata descriptor */
1735  if (get16(pp, desc_end) == 0xFFFF)
1736  *pp += 4;
1737  if (get8(pp, desc_end) == 0xFF) {
1738  st->codec->codec_tag = bytestream_get_le32(pp);
1739  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1740  mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1741  }
1742  break;
1743  case 0x7f: /* DVB extension descriptor */
1744  ext_desc_tag = get8(pp, desc_end);
1745  if (ext_desc_tag < 0)
1746  return AVERROR_INVALIDDATA;
1747  if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1748  ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1749  if (!st->codec->extradata) {
1752  if (!st->codec->extradata)
1753  return AVERROR(ENOMEM);
1754 
1757 
1758  channel_config_code = get8(pp, desc_end);
1759  if (channel_config_code < 0)
1760  return AVERROR_INVALIDDATA;
1761  if (channel_config_code <= 0x8) {
1762  st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1763  st->codec->extradata[18] = channels > 2;
1764  st->codec->extradata[19] = channels - opus_coupled_stream_cnt[channel_config_code];
1765  if (channel_config_code == 0) { /* Dual Mono */
1766  st->codec->extradata[18] = 255; /* Mapping */
1767  }
1768  st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1769  memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1770  } else {
1771  avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1772  }
1774  }
1775  }
1776  break;
1777  default:
1778  break;
1779  }
1780  *pp = desc_end;
1781  return 0;
1782 }
1783 
1784 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1785 {
1786  MpegTSContext *ts = filter->u.section_filter.opaque;
1787  SectionHeader h1, *h = &h1;
1788  PESContext *pes;
1789  AVStream *st;
1790  const uint8_t *p, *p_end, *desc_list_end;
1791  int program_info_length, pcr_pid, pid, stream_type;
1792  int desc_list_len;
1793  uint32_t prog_reg_desc = 0; /* registration descriptor */
1794 
1795  int mp4_descr_count = 0;
1796  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1797  int i;
1798 
1799  av_dlog(ts->stream, "PMT: len %i\n", section_len);
1800  hex_dump_debug(ts->stream, section, section_len);
1801 
1802  p_end = section + section_len - 4;
1803  p = section;
1804  if (parse_section_header(h, &p, p_end) < 0)
1805  return;
1806 
1807  av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d version=%d\n",
1808  h->id, h->sec_num, h->last_sec_num, h->version);
1809 
1810  if (h->tid != PMT_TID)
1811  return;
1812  if (!ts->scan_all_pmts && ts->skip_changes)
1813  return;
1814 
1815  if (!ts->skip_clear)
1816  clear_program(ts, h->id);
1817 
1818  pcr_pid = get16(&p, p_end);
1819  if (pcr_pid < 0)
1820  return;
1821  pcr_pid &= 0x1fff;
1822  add_pid_to_pmt(ts, h->id, pcr_pid);
1823  set_pcr_pid(ts->stream, h->id, pcr_pid);
1824 
1825  av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1826 
1827  program_info_length = get16(&p, p_end);
1828  if (program_info_length < 0)
1829  return;
1830  program_info_length &= 0xfff;
1831  while (program_info_length >= 2) {
1832  uint8_t tag, len;
1833  tag = get8(&p, p_end);
1834  len = get8(&p, p_end);
1835 
1836  av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1837 
1838  if (len > program_info_length - 2)
1839  // something else is broken, exit the program_descriptors_loop
1840  break;
1841  program_info_length -= len + 2;
1842  if (tag == 0x1d) { // IOD descriptor
1843  get8(&p, p_end); // scope
1844  get8(&p, p_end); // label
1845  len -= 2;
1846  mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1847  &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1848  } else if (tag == 0x05 && len >= 4) { // registration descriptor
1849  prog_reg_desc = bytestream_get_le32(&p);
1850  len -= 4;
1851  }
1852  p += len;
1853  }
1854  p += program_info_length;
1855  if (p >= p_end)
1856  goto out;
1857 
1858  // stop parsing after pmt, we found header
1859  if (!ts->stream->nb_streams)
1860  ts->stop_parse = 2;
1861 
1862  set_pmt_found(ts, h->id);
1863 
1864 
1865  for (;;) {
1866  st = 0;
1867  pes = NULL;
1868  stream_type = get8(&p, p_end);
1869  if (stream_type < 0)
1870  break;
1871  pid = get16(&p, p_end);
1872  if (pid < 0)
1873  goto out;
1874  pid &= 0x1fff;
1875  if (pid == ts->current_pid)
1876  goto out;
1877 
1878  /* now create stream */
1879  if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1880  pes = ts->pids[pid]->u.pes_filter.opaque;
1881  if (!pes->st) {
1882  pes->st = avformat_new_stream(pes->stream, NULL);
1883  if (!pes->st)
1884  goto out;
1885  pes->st->id = pes->pid;
1886  }
1887  st = pes->st;
1888  } else if (stream_type != 0x13) {
1889  if (ts->pids[pid])
1890  mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1891  pes = add_pes_stream(ts, pid, pcr_pid);
1892  if (pes) {
1893  st = avformat_new_stream(pes->stream, NULL);
1894  if (!st)
1895  goto out;
1896  st->id = pes->pid;
1897  }
1898  } else {
1899  int idx = ff_find_stream_index(ts->stream, pid);
1900  if (idx >= 0) {
1901  st = ts->stream->streams[idx];
1902  } else {
1903  st = avformat_new_stream(ts->stream, NULL);
1904  if (!st)
1905  goto out;
1906  st->id = pid;
1908  }
1909  }
1910 
1911  if (!st)
1912  goto out;
1913 
1914  if (pes && !pes->stream_type)
1915  mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1916 
1917  add_pid_to_pmt(ts, h->id, pid);
1918 
1920 
1921  desc_list_len = get16(&p, p_end);
1922  if (desc_list_len < 0)
1923  goto out;
1924  desc_list_len &= 0xfff;
1925  desc_list_end = p + desc_list_len;
1926  if (desc_list_end > p_end)
1927  goto out;
1928  for (;;) {
1929  if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1930  desc_list_end, mp4_descr,
1931  mp4_descr_count, pid, ts) < 0)
1932  break;
1933 
1934  if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1935  stream_type == 0x83 && pes->sub_st) {
1937  pes->sub_st->index);
1938  pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1939  }
1940  }
1941  p = desc_list_end;
1942  }
1943 
1944  if (!ts->pids[pcr_pid])
1945  mpegts_open_pcr_filter(ts, pcr_pid);
1946 
1947 out:
1948  for (i = 0; i < mp4_descr_count; i++)
1949  av_free(mp4_descr[i].dec_config_descr);
1950 }
1951 
1952 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1953 {
1954  MpegTSContext *ts = filter->u.section_filter.opaque;
1955  SectionHeader h1, *h = &h1;
1956  const uint8_t *p, *p_end;
1957  int sid, pmt_pid;
1958  AVProgram *program;
1959 
1960  av_dlog(ts->stream, "PAT:\n");
1961  hex_dump_debug(ts->stream, section, section_len);
1962 
1963  p_end = section + section_len - 4;
1964  p = section;
1965  if (parse_section_header(h, &p, p_end) < 0)
1966  return;
1967  if (h->tid != PAT_TID)
1968  return;
1969  if (ts->skip_changes)
1970  return;
1971 
1972  ts->stream->ts_id = h->id;
1973 
1974  clear_programs(ts);
1975  for (;;) {
1976  sid = get16(&p, p_end);
1977  if (sid < 0)
1978  break;
1979  pmt_pid = get16(&p, p_end);
1980  if (pmt_pid < 0)
1981  break;
1982  pmt_pid &= 0x1fff;
1983 
1984  if (pmt_pid == ts->current_pid)
1985  break;
1986 
1987  av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1988 
1989  if (sid == 0x0000) {
1990  /* NIT info */
1991  } else {
1992  MpegTSFilter *fil = ts->pids[pmt_pid];
1993  program = av_new_program(ts->stream, sid);
1994  if (program) {
1995  program->program_num = sid;
1996  program->pmt_pid = pmt_pid;
1997  }
1998  if (fil)
1999  if ( fil->type != MPEGTS_SECTION
2000  || fil->pid != pmt_pid
2001  || fil->u.section_filter.section_cb != pmt_cb)
2002  mpegts_close_filter(ts, ts->pids[pmt_pid]);
2003 
2004  if (!ts->pids[pmt_pid])
2005  mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2006  add_pat_entry(ts, sid);
2007  add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2008  add_pid_to_pmt(ts, sid, pmt_pid);
2009  }
2010  }
2011 
2012  if (sid < 0) {
2013  int i,j;
2014  for (j=0; j<ts->stream->nb_programs; j++) {
2015  for (i = 0; i < ts->nb_prg; i++)
2016  if (ts->prg[i].id == ts->stream->programs[j]->id)
2017  break;
2018  if (i==ts->nb_prg && !ts->skip_clear)
2019  clear_avprogram(ts, ts->stream->programs[j]->id);
2020  }
2021  }
2022 }
2023 
2024 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2025 {
2026  MpegTSContext *ts = filter->u.section_filter.opaque;
2027  SectionHeader h1, *h = &h1;
2028  const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2029  int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2030  char *name, *provider_name;
2031 
2032  av_dlog(ts->stream, "SDT:\n");
2033  hex_dump_debug(ts->stream, section, section_len);
2034 
2035  p_end = section + section_len - 4;
2036  p = section;
2037  if (parse_section_header(h, &p, p_end) < 0)
2038  return;
2039  if (h->tid != SDT_TID)
2040  return;
2041  if (ts->skip_changes)
2042  return;
2043  onid = get16(&p, p_end);
2044  if (onid < 0)
2045  return;
2046  val = get8(&p, p_end);
2047  if (val < 0)
2048  return;
2049  for (;;) {
2050  sid = get16(&p, p_end);
2051  if (sid < 0)
2052  break;
2053  val = get8(&p, p_end);
2054  if (val < 0)
2055  break;
2056  desc_list_len = get16(&p, p_end);
2057  if (desc_list_len < 0)
2058  break;
2059  desc_list_len &= 0xfff;
2060  desc_list_end = p + desc_list_len;
2061  if (desc_list_end > p_end)
2062  break;
2063  for (;;) {
2064  desc_tag = get8(&p, desc_list_end);
2065  if (desc_tag < 0)
2066  break;
2067  desc_len = get8(&p, desc_list_end);
2068  desc_end = p + desc_len;
2069  if (desc_len < 0 || desc_end > desc_list_end)
2070  break;
2071 
2072  av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
2073  desc_tag, desc_len);
2074 
2075  switch (desc_tag) {
2076  case 0x48:
2077  service_type = get8(&p, p_end);
2078  if (service_type < 0)
2079  break;
2080  provider_name = getstr8(&p, p_end);
2081  if (!provider_name)
2082  break;
2083  name = getstr8(&p, p_end);
2084  if (name) {
2085  AVProgram *program = av_new_program(ts->stream, sid);
2086  if (program) {
2087  av_dict_set(&program->metadata, "service_name", name, 0);
2088  av_dict_set(&program->metadata, "service_provider",
2089  provider_name, 0);
2090  }
2091  }
2092  av_free(name);
2093  av_free(provider_name);
2094  break;
2095  default:
2096  break;
2097  }
2098  p = desc_end;
2099  }
2100  p = desc_list_end;
2101  }
2102 }
2103 
2104 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2105  const uint8_t *packet);
2106 
2107 /* handle one TS packet */
2108 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2109 {
2110  MpegTSFilter *tss;
2111  int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2112  has_adaptation, has_payload;
2113  const uint8_t *p, *p_end;
2114  int64_t pos;
2115 
2116  pid = AV_RB16(packet + 1) & 0x1fff;
2117  if (pid && discard_pid(ts, pid))
2118  return 0;
2119  is_start = packet[1] & 0x40;
2120  tss = ts->pids[pid];
2121  if (ts->auto_guess && !tss && is_start) {
2122  add_pes_stream(ts, pid, -1);
2123  tss = ts->pids[pid];
2124  }
2125  if (!tss)
2126  return 0;
2127  ts->current_pid = pid;
2128 
2129  afc = (packet[3] >> 4) & 3;
2130  if (afc == 0) /* reserved value */
2131  return 0;
2132  has_adaptation = afc & 2;
2133  has_payload = afc & 1;
2134  is_discontinuity = has_adaptation &&
2135  packet[4] != 0 && /* with length > 0 */
2136  (packet[5] & 0x80); /* and discontinuity indicated */
2137 
2138  /* continuity check (currently not used) */
2139  cc = (packet[3] & 0xf);
2140  expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2141  cc_ok = pid == 0x1FFF || // null packet PID
2142  is_discontinuity ||
2143  tss->last_cc < 0 ||
2144  expected_cc == cc;
2145 
2146  tss->last_cc = cc;
2147  if (!cc_ok) {
2148  av_log(ts->stream, AV_LOG_DEBUG,
2149  "Continuity check failed for pid %d expected %d got %d\n",
2150  pid, expected_cc, cc);
2151  if (tss->type == MPEGTS_PES) {
2152  PESContext *pc = tss->u.pes_filter.opaque;
2153  pc->flags |= AV_PKT_FLAG_CORRUPT;
2154  }
2155  }
2156 
2157  p = packet + 4;
2158  if (has_adaptation) {
2159  int64_t pcr_h;
2160  int pcr_l;
2161  if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2162  tss->last_pcr = pcr_h * 300 + pcr_l;
2163  /* skip adaptation field */
2164  p += p[0] + 1;
2165  }
2166  /* if past the end of packet, ignore */
2167  p_end = packet + TS_PACKET_SIZE;
2168  if (p >= p_end || !has_payload)
2169  return 0;
2170 
2171  pos = avio_tell(ts->stream->pb);
2172  if (pos >= 0) {
2173  av_assert0(pos >= TS_PACKET_SIZE);
2174  ts->pos47_full = pos - TS_PACKET_SIZE;
2175  }
2176 
2177  if (tss->type == MPEGTS_SECTION) {
2178  if (is_start) {
2179  /* pointer field present */
2180  len = *p++;
2181  if (p + len > p_end)
2182  return 0;
2183  if (len && cc_ok) {
2184  /* write remaining section bytes */
2185  write_section_data(ts, tss,
2186  p, len, 0);
2187  /* check whether filter has been closed */
2188  if (!ts->pids[pid])
2189  return 0;
2190  }
2191  p += len;
2192  if (p < p_end) {
2193  write_section_data(ts, tss,
2194  p, p_end - p, 1);
2195  }
2196  } else {
2197  if (cc_ok) {
2198  write_section_data(ts, tss,
2199  p, p_end - p, 0);
2200  }
2201  }
2202 
2203  // stop find_stream_info from waiting for more streams
2204  // when all programs have received a PMT
2205  if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2206  int i;
2207  for (i = 0; i < ts->nb_prg; i++) {
2208  if (!ts->prg[i].pmt_found)
2209  break;
2210  }
2211  if (i == ts->nb_prg && ts->nb_prg > 0) {
2212  int types = 0;
2213  for (i = 0; i < ts->stream->nb_streams; i++) {
2214  AVStream *st = ts->stream->streams[i];
2215  types |= 1<<st->codec->codec_type;
2216  }
2217  if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2218  av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2220  }
2221  }
2222  }
2223 
2224  } else {
2225  int ret;
2226  // Note: The position here points actually behind the current packet.
2227  if (tss->type == MPEGTS_PES) {
2228  if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2229  pos - ts->raw_packet_size)) < 0)
2230  return ret;
2231  }
2232  }
2233 
2234  return 0;
2235 }
2236 
2237 static void reanalyze(MpegTSContext *ts) {
2238  AVIOContext *pb = ts->stream->pb;
2239  int64_t pos = avio_tell(pb);
2240  if (pos < 0)
2241  return;
2242  pos -= ts->pos47_full;
2243  if (pos == TS_PACKET_SIZE) {
2244  ts->size_stat[0] ++;
2245  } else if (pos == TS_DVHS_PACKET_SIZE) {
2246  ts->size_stat[1] ++;
2247  } else if (pos == TS_FEC_PACKET_SIZE) {
2248  ts->size_stat[2] ++;
2249  }
2250 
2251  ts->size_stat_count ++;
2253  int newsize = 0;
2254  if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2255  newsize = TS_PACKET_SIZE;
2256  } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2257  newsize = TS_DVHS_PACKET_SIZE;
2258  } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2259  newsize = TS_FEC_PACKET_SIZE;
2260  }
2261  if (newsize && newsize != ts->raw_packet_size) {
2262  av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2263  ts->raw_packet_size = newsize;
2264  }
2265  ts->size_stat_count = 0;
2266  memset(ts->size_stat, 0, sizeof(ts->size_stat));
2267  }
2268 }
2269 
2270 /* XXX: try to find a better synchro over several packets (use
2271  * get_packet_size() ?) */
2273 {
2274  MpegTSContext *ts = s->priv_data;
2275  AVIOContext *pb = s->pb;
2276  int c, i;
2277 
2278  for (i = 0; i < ts->resync_size; i++) {
2279  c = avio_r8(pb);
2280  if (avio_feof(pb))
2281  return AVERROR_EOF;
2282  if (c == 0x47) {
2283  avio_seek(pb, -1, SEEK_CUR);
2284  reanalyze(s->priv_data);
2285  return 0;
2286  }
2287  }
2288  av_log(s, AV_LOG_ERROR,
2289  "max resync size reached, could not find sync byte\n");
2290  /* no sync found */
2291  return AVERROR_INVALIDDATA;
2292 }
2293 
2294 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2295 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2296  const uint8_t **data)
2297 {
2298  AVIOContext *pb = s->pb;
2299  int len;
2300 
2301  for (;;) {
2302  len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2303  if (len != TS_PACKET_SIZE)
2304  return len < 0 ? len : AVERROR_EOF;
2305  /* check packet sync byte */
2306  if ((*data)[0] != 0x47) {
2307  /* find a new packet start */
2308  uint64_t pos = avio_tell(pb);
2309  avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2310 
2311  if (mpegts_resync(s) < 0)
2312  return AVERROR(EAGAIN);
2313  else
2314  continue;
2315  } else {
2316  break;
2317  }
2318  }
2319  return 0;
2320 }
2321 
2322 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2323 {
2324  AVIOContext *pb = s->pb;
2325  int skip = raw_packet_size - TS_PACKET_SIZE;
2326  if (skip > 0)
2327  avio_skip(pb, skip);
2328 }
2329 
2330 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2331 {
2332  AVFormatContext *s = ts->stream;
2334  const uint8_t *data;
2335  int64_t packet_num;
2336  int ret = 0;
2337 
2338  if (avio_tell(s->pb) != ts->last_pos) {
2339  int i;
2340  av_dlog(ts->stream, "Skipping after seek\n");
2341  /* seek detected, flush pes buffer */
2342  for (i = 0; i < NB_PID_MAX; i++) {
2343  if (ts->pids[i]) {
2344  if (ts->pids[i]->type == MPEGTS_PES) {
2345  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2346  av_buffer_unref(&pes->buffer);
2347  pes->data_index = 0;
2348  pes->state = MPEGTS_SKIP; /* skip until pes header */
2349  }
2350  ts->pids[i]->last_cc = -1;
2351  ts->pids[i]->last_pcr = -1;
2352  }
2353  }
2354  }
2355 
2356  ts->stop_parse = 0;
2357  packet_num = 0;
2358  memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2359  for (;;) {
2360  packet_num++;
2361  if (nb_packets != 0 && packet_num >= nb_packets ||
2362  ts->stop_parse > 1) {
2363  ret = AVERROR(EAGAIN);
2364  break;
2365  }
2366  if (ts->stop_parse > 0)
2367  break;
2368 
2369  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2370  if (ret != 0)
2371  break;
2372  ret = handle_packet(ts, data);
2374  if (ret != 0)
2375  break;
2376  }
2377  ts->last_pos = avio_tell(s->pb);
2378  return ret;
2379 }
2380 
2382 {
2383  const int size = p->buf_size;
2384  int maxscore = 0;
2385  int sumscore = 0;
2386  int i;
2387  int check_count = size / TS_FEC_PACKET_SIZE;
2388 #define CHECK_COUNT 10
2389 #define CHECK_BLOCK 100
2390 
2391  if (check_count < CHECK_COUNT)
2392  return AVERROR_INVALIDDATA;
2393 
2394  for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2395  int left = FFMIN(check_count - i, CHECK_BLOCK);
2396  int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2397  int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2398  int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2399  score = FFMAX3(score, dvhs_score, fec_score);
2400  sumscore += score;
2401  maxscore = FFMAX(maxscore, score);
2402  }
2403 
2404  sumscore = sumscore * CHECK_COUNT / check_count;
2405  maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2406 
2407  av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2408 
2409  if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2410  else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2411  else
2412  return AVERROR_INVALIDDATA;
2413 }
2414 
2415 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2416  * (-1) if not available */
2417 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2418 {
2419  int afc, len, flags;
2420  const uint8_t *p;
2421  unsigned int v;
2422 
2423  afc = (packet[3] >> 4) & 3;
2424  if (afc <= 1)
2425  return AVERROR_INVALIDDATA;
2426  p = packet + 4;
2427  len = p[0];
2428  p++;
2429  if (len == 0)
2430  return AVERROR_INVALIDDATA;
2431  flags = *p++;
2432  len--;
2433  if (!(flags & 0x10))
2434  return AVERROR_INVALIDDATA;
2435  if (len < 6)
2436  return AVERROR_INVALIDDATA;
2437  v = AV_RB32(p);
2438  *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2439  *ppcr_low = ((p[4] & 1) << 8) | p[5];
2440  return 0;
2441 }
2442 
2443 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2444 
2445  /* NOTE: We attempt to seek on non-seekable files as well, as the
2446  * probe buffer usually is big enough. Only warn if the seek failed
2447  * on files where the seek should work. */
2448  if (avio_seek(pb, pos, SEEK_SET) < 0)
2449  av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2450 }
2451 
2453 {
2454  MpegTSContext *ts = s->priv_data;
2455  AVIOContext *pb = s->pb;
2456  uint8_t buf[8 * 1024] = {0};
2457  int len;
2458  int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2459 
2460  if (ffio_ensure_seekback(pb, probesize) < 0)
2461  av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
2462 
2463  /* read the first 8192 bytes to get packet size */
2464  pos = avio_tell(pb);
2465  len = avio_read(pb, buf, sizeof(buf));
2466  ts->raw_packet_size = get_packet_size(buf, len);
2467  if (ts->raw_packet_size <= 0) {
2468  av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2470  }
2471  ts->stream = s;
2472  ts->auto_guess = 0;
2473 
2474  if (s->iformat == &ff_mpegts_demuxer) {
2475  /* normal demux */
2476 
2477  /* first do a scan to get all the services */
2478  seek_back(s, pb, pos);
2479 
2481 
2483 
2484  handle_packets(ts, probesize / ts->raw_packet_size);
2485  /* if could not find service, enable auto_guess */
2486 
2487  ts->auto_guess = 1;
2488 
2489  av_dlog(ts->stream, "tuning done\n");
2490 
2492  } else {
2493  AVStream *st;
2494  int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2495  int64_t pcrs[2], pcr_h;
2496  int packet_count[2];
2497  uint8_t packet[TS_PACKET_SIZE];
2498  const uint8_t *data;
2499 
2500  /* only read packets */
2501 
2502  st = avformat_new_stream(s, NULL);
2503  if (!st)
2504  return AVERROR(ENOMEM);
2505  avpriv_set_pts_info(st, 60, 1, 27000000);
2508 
2509  /* we iterate until we find two PCRs to estimate the bitrate */
2510  pcr_pid = -1;
2511  nb_pcrs = 0;
2512  nb_packets = 0;
2513  for (;;) {
2514  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2515  if (ret < 0)
2516  return ret;
2517  pid = AV_RB16(data + 1) & 0x1fff;
2518  if ((pcr_pid == -1 || pcr_pid == pid) &&
2519  parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2521  pcr_pid = pid;
2522  packet_count[nb_pcrs] = nb_packets;
2523  pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2524  nb_pcrs++;
2525  if (nb_pcrs >= 2)
2526  break;
2527  } else {
2529  }
2530  nb_packets++;
2531  }
2532 
2533  /* NOTE1: the bitrate is computed without the FEC */
2534  /* NOTE2: it is only the bitrate of the start of the stream */
2535  ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2536  ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2537  s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2538  st->codec->bit_rate = s->bit_rate;
2539  st->start_time = ts->cur_pcr;
2540  av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2541  st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2542  }
2543 
2544  seek_back(s, pb, pos);
2545  return 0;
2546 }
2547 
2548 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2549 
2551 {
2552  MpegTSContext *ts = s->priv_data;
2553  int ret, i;
2554  int64_t pcr_h, next_pcr_h, pos;
2555  int pcr_l, next_pcr_l;
2556  uint8_t pcr_buf[12];
2557  const uint8_t *data;
2558 
2559  if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2560  return AVERROR(ENOMEM);
2561  ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2562  pkt->pos = avio_tell(s->pb);
2563  if (ret < 0) {
2564  av_free_packet(pkt);
2565  return ret;
2566  }
2567  if (data != pkt->data)
2568  memcpy(pkt->data, data, ts->raw_packet_size);
2570  if (ts->mpeg2ts_compute_pcr) {
2571  /* compute exact PCR for each packet */
2572  if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2573  /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2574  pos = avio_tell(s->pb);
2575  for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2576  avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2577  avio_read(s->pb, pcr_buf, 12);
2578  if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2579  /* XXX: not precise enough */
2580  ts->pcr_incr =
2581  ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2582  (i + 1);
2583  break;
2584  }
2585  }
2586  avio_seek(s->pb, pos, SEEK_SET);
2587  /* no next PCR found: we use previous increment */
2588  ts->cur_pcr = pcr_h * 300 + pcr_l;
2589  }
2590  pkt->pts = ts->cur_pcr;
2591  pkt->duration = ts->pcr_incr;
2592  ts->cur_pcr += ts->pcr_incr;
2593  }
2594  pkt->stream_index = 0;
2595  return 0;
2596 }
2597 
2599 {
2600  MpegTSContext *ts = s->priv_data;
2601  int ret, i;
2602 
2603  pkt->size = -1;
2604  ts->pkt = pkt;
2605  ret = handle_packets(ts, 0);
2606  if (ret < 0) {
2607  av_free_packet(ts->pkt);
2608  /* flush pes data left */
2609  for (i = 0; i < NB_PID_MAX; i++)
2610  if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2611  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2612  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2613  new_pes_packet(pes, pkt);
2614  pes->state = MPEGTS_SKIP;
2615  ret = 0;
2616  break;
2617  }
2618  }
2619  }
2620 
2621  if (!ret && pkt->size < 0)
2622  ret = AVERROR(EINTR);
2623  return ret;
2624 }
2625 
2626 static void mpegts_free(MpegTSContext *ts)
2627 {
2628  int i;
2629 
2630  clear_programs(ts);
2631 
2632  for (i = 0; i < NB_PID_MAX; i++)
2633  if (ts->pids[i])
2634  mpegts_close_filter(ts, ts->pids[i]);
2635 }
2636 
2638 {
2639  MpegTSContext *ts = s->priv_data;
2640  mpegts_free(ts);
2641  return 0;
2642 }
2643 
2644 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2645  int64_t *ppos, int64_t pos_limit)
2646 {
2647  MpegTSContext *ts = s->priv_data;
2648  int64_t pos, timestamp;
2650  int pcr_l, pcr_pid =
2651  ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2652  int pos47 = ts->pos47_full % ts->raw_packet_size;
2653  pos =
2654  ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2655  ts->raw_packet_size + pos47;
2656  while(pos < pos_limit) {
2657  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2658  return AV_NOPTS_VALUE;
2659  if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2660  return AV_NOPTS_VALUE;
2661  if (buf[0] != 0x47) {
2662  avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2663  if (mpegts_resync(s) < 0)
2664  return AV_NOPTS_VALUE;
2665  pos = avio_tell(s->pb);
2666  continue;
2667  }
2668  if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2669  parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2670  *ppos = pos;
2671  return timestamp;
2672  }
2673  pos += ts->raw_packet_size;
2674  }
2675 
2676  return AV_NOPTS_VALUE;
2677 }
2678 
2679 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2680  int64_t *ppos, int64_t pos_limit)
2681 {
2682  MpegTSContext *ts = s->priv_data;
2683  int64_t pos;
2684  int pos47 = ts->pos47_full % ts->raw_packet_size;
2685  pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2687  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2688  return AV_NOPTS_VALUE;
2689  while(pos < pos_limit) {
2690  int ret;
2691  AVPacket pkt;
2692  av_init_packet(&pkt);
2693  ret = av_read_frame(s, &pkt);
2694  if (ret < 0)
2695  return AV_NOPTS_VALUE;
2696  av_free_packet(&pkt);
2697  if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2698  ff_reduce_index(s, pkt.stream_index);
2699  av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2700  if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2701  *ppos = pkt.pos;
2702  return pkt.dts;
2703  }
2704  }
2705  pos = pkt.pos;
2706  }
2707 
2708  return AV_NOPTS_VALUE;
2709 }
2710 
2711 /**************************************************************/
2712 /* parsing functions - called from other demuxers such as RTP */
2713 
2715 {
2716  MpegTSContext *ts;
2717 
2718  ts = av_mallocz(sizeof(MpegTSContext));
2719  if (!ts)
2720  return NULL;
2721  /* no stream case, currently used by RTP */
2723  ts->stream = s;
2724  ts->auto_guess = 1;
2727 
2728  return ts;
2729 }
2730 
2731 /* return the consumed length if a packet was output, or -1 if no
2732  * packet is output */
2734  const uint8_t *buf, int len)
2735 {
2736  int len1;
2737 
2738  len1 = len;
2739  ts->pkt = pkt;
2740  for (;;) {
2741  ts->stop_parse = 0;
2742  if (len < TS_PACKET_SIZE)
2743  return AVERROR_INVALIDDATA;
2744  if (buf[0] != 0x47) {
2745  buf++;
2746  len--;
2747  } else {
2748  handle_packet(ts, buf);
2749  buf += TS_PACKET_SIZE;
2750  len -= TS_PACKET_SIZE;
2751  if (ts->stop_parse == 1)
2752  break;
2753  }
2754  }
2755  return len1 - len;
2756 }
2757 
2759 {
2760  mpegts_free(ts);
2761  av_free(ts);
2762 }
2763 
2764 AVInputFormat ff_mpegts_demuxer = {
2765  .name = "mpegts",
2766  .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2767  .priv_data_size = sizeof(MpegTSContext),
2772  .read_timestamp = mpegts_get_dts,
2774  .priv_class = &mpegts_class,
2775 };
2776 
2778  .name = "mpegtsraw",
2779  .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2780  .priv_data_size = sizeof(MpegTSContext),
2784  .read_timestamp = mpegts_get_dts,
2786  .priv_class = &mpegtsraw_class,
2787 };