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mpegts.c
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1 /*
2  * MPEG2 transport stream (aka DVB) demuxer
3  * Copyright (c) 2002-2003 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/log.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/avassert.h"
30 #include "libavcodec/bytestream.h"
31 #include "libavcodec/get_bits.h"
32 #include "libavcodec/opus.h"
33 #include "avformat.h"
34 #include "mpegts.h"
35 #include "internal.h"
36 #include "avio_internal.h"
37 #include "seek.h"
38 #include "mpeg.h"
39 #include "isom.h"
40 
41 /* maximum size in which we look for synchronisation if
42  * synchronisation is lost */
43 #define MAX_RESYNC_SIZE 65536
44 
45 #define MAX_PES_PAYLOAD 200 * 1024
46 
47 #define MAX_MP4_DESCR_COUNT 16
48 
49 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
50  do { \
51  if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
52  (modulus) = (dividend) % (divisor); \
53  (prev_dividend) = (dividend); \
54  } while (0)
55 
60 };
61 
62 typedef struct MpegTSFilter MpegTSFilter;
63 
64 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
65  int is_start, int64_t pos);
66 
67 typedef struct MpegTSPESFilter {
69  void *opaque;
71 
72 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
73 
74 typedef void SetServiceCallback (void *opaque, int ret);
75 
76 typedef struct MpegTSSectionFilter {
80  unsigned int check_crc : 1;
81  unsigned int end_of_section_reached : 1;
83  void *opaque;
85 
86 struct MpegTSFilter {
87  int pid;
88  int es_id;
89  int last_cc; /* last cc code (-1 if first packet) */
90  int64_t last_pcr;
92  union {
95  } u;
96 };
97 
98 #define MAX_PIDS_PER_PROGRAM 64
99 struct Program {
100  unsigned int id; // program id/service id
101  unsigned int nb_pids;
102  unsigned int pids[MAX_PIDS_PER_PROGRAM];
103 
104  /** have we found pmt for this program */
106 };
107 
109  const AVClass *class;
110  /* user data */
112  /** raw packet size, including FEC if present */
114 
115  int size_stat[3];
117 #define SIZE_STAT_THRESHOLD 10
118 
119  int64_t pos47_full;
120 
121  /** if true, all pids are analyzed to find streams */
123 
124  /** compute exact PCR for each transport stream packet */
126 
127  /** fix dvb teletext pts */
129 
130  int64_t cur_pcr; /**< used to estimate the exact PCR */
131  int pcr_incr; /**< used to estimate the exact PCR */
132 
133  /* data needed to handle file based ts */
134  /** stop parsing loop */
136  /** packet containing Audio/Video data */
138  /** to detect seek */
139  int64_t last_pos;
140 
143 
145 
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
682  { 0 },
683 };
684 
685 static const StreamType HDMV_types[] = {
691  { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
692  { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
693  { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
694  { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
696  { 0 },
697 };
698 
699 /* ATSC ? */
700 static const StreamType MISC_types[] = {
703  { 0 },
704 };
705 
706 static const StreamType REGD_types[] = {
707  { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
708  { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
709  { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
710  { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
711  { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
712  { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
713  { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
714  { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
715  { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
716  { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
717  { 0 },
718 };
719 
720 static const StreamType METADATA_types[] = {
721  { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
722  { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
723  { 0 },
724 };
725 
726 /* descriptor present */
727 static const StreamType DESC_types[] = {
728  { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
729  { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
732  { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
733  { 0 },
734 };
735 
737  uint32_t stream_type,
738  const StreamType *types)
739 {
740  if (avcodec_is_open(st->codec)) {
741  av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
742  return;
743  }
744 
745  for (; types->stream_type; types++)
746  if (stream_type == types->stream_type) {
747  st->codec->codec_type = types->codec_type;
748  st->codec->codec_id = types->codec_id;
749  st->request_probe = 0;
750  return;
751  }
752 }
753 
755  uint32_t stream_type, uint32_t prog_reg_desc)
756 {
757  int old_codec_type = st->codec->codec_type;
758  int old_codec_id = st->codec->codec_id;
759 
760  if (avcodec_is_open(st->codec)) {
761  av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
762  return 0;
763  }
764 
765  avpriv_set_pts_info(st, 33, 1, 90000);
766  st->priv_data = pes;
770  pes->st = st;
771  pes->stream_type = stream_type;
772 
773  av_log(pes->stream, AV_LOG_DEBUG,
774  "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
775  st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
776 
777  st->codec->codec_tag = pes->stream_type;
778 
779  mpegts_find_stream_type(st, pes->stream_type, ISO_types);
780  if ((prog_reg_desc == AV_RL32("HDMV") ||
781  prog_reg_desc == AV_RL32("HDPR")) &&
782  st->codec->codec_id == AV_CODEC_ID_NONE) {
783  mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
784  if (pes->stream_type == 0x83) {
785  // HDMV TrueHD streams also contain an AC3 coded version of the
786  // audio track - add a second stream for this
787  AVStream *sub_st;
788  // priv_data cannot be shared between streams
789  PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
790  if (!sub_pes)
791  return AVERROR(ENOMEM);
792  memcpy(sub_pes, pes, sizeof(*sub_pes));
793 
794  sub_st = avformat_new_stream(pes->stream, NULL);
795  if (!sub_st) {
796  av_free(sub_pes);
797  return AVERROR(ENOMEM);
798  }
799 
800  sub_st->id = pes->pid;
801  avpriv_set_pts_info(sub_st, 33, 1, 90000);
802  sub_st->priv_data = sub_pes;
804  sub_st->codec->codec_id = AV_CODEC_ID_AC3;
806  sub_pes->sub_st = pes->sub_st = sub_st;
807  }
808  }
809  if (st->codec->codec_id == AV_CODEC_ID_NONE)
810  mpegts_find_stream_type(st, pes->stream_type, MISC_types);
811  if (st->codec->codec_id == AV_CODEC_ID_NONE) {
812  st->codec->codec_id = old_codec_id;
813  st->codec->codec_type = old_codec_type;
814  }
815 
816  return 0;
817 }
818 
820 {
821  pes->pts = AV_NOPTS_VALUE;
822  pes->dts = AV_NOPTS_VALUE;
823  pes->data_index = 0;
824  pes->flags = 0;
825  av_buffer_unref(&pes->buffer);
826 }
827 
829 {
830  av_init_packet(pkt);
831 
832  pkt->buf = pes->buffer;
833  pkt->data = pes->buffer->data;
834  pkt->size = pes->data_index;
835 
836  if (pes->total_size != MAX_PES_PAYLOAD &&
837  pes->pes_header_size + pes->data_index != pes->total_size +
838  PES_START_SIZE) {
839  av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
840  pes->flags |= AV_PKT_FLAG_CORRUPT;
841  }
842  memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
843 
844  // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
845  if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
846  pkt->stream_index = pes->sub_st->index;
847  else
848  pkt->stream_index = pes->st->index;
849  pkt->pts = pes->pts;
850  pkt->dts = pes->dts;
851  /* store position of first TS packet of this PES packet */
852  pkt->pos = pes->ts_packet_pos;
853  pkt->flags = pes->flags;
854 
855  pes->buffer = NULL;
857 }
858 
859 static uint64_t get_ts64(GetBitContext *gb, int bits)
860 {
861  if (get_bits_left(gb) < bits)
862  return AV_NOPTS_VALUE;
863  return get_bits64(gb, bits);
864 }
865 
867  const uint8_t *buf, int buf_size)
868 {
869  GetBitContext gb;
870  int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
871  int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
872  int dts_flag = -1, cts_flag = -1;
873  int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
874  uint8_t buf_padded[128 + FF_INPUT_BUFFER_PADDING_SIZE];
875  int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - FF_INPUT_BUFFER_PADDING_SIZE);
876 
877  memcpy(buf_padded, buf, buf_padded_size);
878 
879  init_get_bits(&gb, buf_padded, buf_padded_size * 8);
880 
881  if (sl->use_au_start)
882  au_start_flag = get_bits1(&gb);
883  if (sl->use_au_end)
884  au_end_flag = get_bits1(&gb);
885  if (!sl->use_au_start && !sl->use_au_end)
886  au_start_flag = au_end_flag = 1;
887  if (sl->ocr_len > 0)
888  ocr_flag = get_bits1(&gb);
889  if (sl->use_idle)
890  idle_flag = get_bits1(&gb);
891  if (sl->use_padding)
892  padding_flag = get_bits1(&gb);
893  if (padding_flag)
894  padding_bits = get_bits(&gb, 3);
895 
896  if (!idle_flag && (!padding_flag || padding_bits != 0)) {
897  if (sl->packet_seq_num_len)
899  if (sl->degr_prior_len)
900  if (get_bits1(&gb))
901  skip_bits(&gb, sl->degr_prior_len);
902  if (ocr_flag)
903  skip_bits_long(&gb, sl->ocr_len);
904  if (au_start_flag) {
905  if (sl->use_rand_acc_pt)
906  get_bits1(&gb);
907  if (sl->au_seq_num_len > 0)
908  skip_bits_long(&gb, sl->au_seq_num_len);
909  if (sl->use_timestamps) {
910  dts_flag = get_bits1(&gb);
911  cts_flag = get_bits1(&gb);
912  }
913  }
914  if (sl->inst_bitrate_len)
915  inst_bitrate_flag = get_bits1(&gb);
916  if (dts_flag == 1)
917  dts = get_ts64(&gb, sl->timestamp_len);
918  if (cts_flag == 1)
919  cts = get_ts64(&gb, sl->timestamp_len);
920  if (sl->au_len > 0)
921  skip_bits_long(&gb, sl->au_len);
922  if (inst_bitrate_flag)
924  }
925 
926  if (dts != AV_NOPTS_VALUE)
927  pes->dts = dts;
928  if (cts != AV_NOPTS_VALUE)
929  pes->pts = cts;
930 
931  if (sl->timestamp_len && sl->timestamp_res)
933 
934  return (get_bits_count(&gb) + 7) >> 3;
935 }
936 
937 /* return non zero if a packet could be constructed */
939  const uint8_t *buf, int buf_size, int is_start,
940  int64_t pos)
941 {
942  PESContext *pes = filter->u.pes_filter.opaque;
943  MpegTSContext *ts = pes->ts;
944  const uint8_t *p;
945  int len, code;
946 
947  if (!ts->pkt)
948  return 0;
949 
950  if (is_start) {
951  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
952  new_pes_packet(pes, ts->pkt);
953  ts->stop_parse = 1;
954  } else {
956  }
957  pes->state = MPEGTS_HEADER;
958  pes->ts_packet_pos = pos;
959  }
960  p = buf;
961  while (buf_size > 0) {
962  switch (pes->state) {
963  case MPEGTS_HEADER:
964  len = PES_START_SIZE - pes->data_index;
965  if (len > buf_size)
966  len = buf_size;
967  memcpy(pes->header + pes->data_index, p, len);
968  pes->data_index += len;
969  p += len;
970  buf_size -= len;
971  if (pes->data_index == PES_START_SIZE) {
972  /* we got all the PES or section header. We can now
973  * decide */
974  if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
975  pes->header[2] == 0x01) {
976  /* it must be an mpeg2 PES stream */
977  code = pes->header[3] | 0x100;
978  av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
979  code);
980 
981  if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
982  (!pes->sub_st ||
983  pes->sub_st->discard == AVDISCARD_ALL)) ||
984  code == 0x1be) /* padding_stream */
985  goto skip;
986 
987  /* stream not present in PMT */
988  if (!pes->st) {
989  if (ts->skip_changes)
990  goto skip;
991 
992  pes->st = avformat_new_stream(ts->stream, NULL);
993  if (!pes->st)
994  return AVERROR(ENOMEM);
995  pes->st->id = pes->pid;
996  mpegts_set_stream_info(pes->st, pes, 0, 0);
997  }
998 
999  pes->total_size = AV_RB16(pes->header + 4);
1000  /* NOTE: a zero total size means the PES size is
1001  * unbounded */
1002  if (!pes->total_size)
1003  pes->total_size = MAX_PES_PAYLOAD;
1004 
1005  /* allocate pes buffer */
1006  pes->buffer = av_buffer_alloc(pes->total_size +
1008  if (!pes->buffer)
1009  return AVERROR(ENOMEM);
1010 
1011  if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1012  code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1013  code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1014  code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1015  pes->state = MPEGTS_PESHEADER;
1016  if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1017  av_dlog(pes->stream,
1018  "pid=%x stream_type=%x probing\n",
1019  pes->pid,
1020  pes->stream_type);
1021  pes->st->request_probe = 1;
1022  }
1023  } else {
1024  pes->state = MPEGTS_PAYLOAD;
1025  pes->data_index = 0;
1026  }
1027  } else {
1028  /* otherwise, it should be a table */
1029  /* skip packet */
1030 skip:
1031  pes->state = MPEGTS_SKIP;
1032  continue;
1033  }
1034  }
1035  break;
1036  /**********************************************/
1037  /* PES packing parsing */
1038  case MPEGTS_PESHEADER:
1039  len = PES_HEADER_SIZE - pes->data_index;
1040  if (len < 0)
1041  return AVERROR_INVALIDDATA;
1042  if (len > buf_size)
1043  len = buf_size;
1044  memcpy(pes->header + pes->data_index, p, len);
1045  pes->data_index += len;
1046  p += len;
1047  buf_size -= len;
1048  if (pes->data_index == PES_HEADER_SIZE) {
1049  pes->pes_header_size = pes->header[8] + 9;
1051  }
1052  break;
1053  case MPEGTS_PESHEADER_FILL:
1054  len = pes->pes_header_size - pes->data_index;
1055  if (len < 0)
1056  return AVERROR_INVALIDDATA;
1057  if (len > buf_size)
1058  len = buf_size;
1059  memcpy(pes->header + pes->data_index, p, len);
1060  pes->data_index += len;
1061  p += len;
1062  buf_size -= len;
1063  if (pes->data_index == pes->pes_header_size) {
1064  const uint8_t *r;
1065  unsigned int flags, pes_ext, skip;
1066 
1067  flags = pes->header[7];
1068  r = pes->header + 9;
1069  pes->pts = AV_NOPTS_VALUE;
1070  pes->dts = AV_NOPTS_VALUE;
1071  if ((flags & 0xc0) == 0x80) {
1072  pes->dts = pes->pts = ff_parse_pes_pts(r);
1073  r += 5;
1074  } else if ((flags & 0xc0) == 0xc0) {
1075  pes->pts = ff_parse_pes_pts(r);
1076  r += 5;
1077  pes->dts = ff_parse_pes_pts(r);
1078  r += 5;
1079  }
1080  pes->extended_stream_id = -1;
1081  if (flags & 0x01) { /* PES extension */
1082  pes_ext = *r++;
1083  /* Skip PES private data, program packet sequence counter and P-STD buffer */
1084  skip = (pes_ext >> 4) & 0xb;
1085  skip += skip & 0x9;
1086  r += skip;
1087  if ((pes_ext & 0x41) == 0x01 &&
1088  (r + 2) <= (pes->header + pes->pes_header_size)) {
1089  /* PES extension 2 */
1090  if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1091  pes->extended_stream_id = r[1];
1092  }
1093  }
1094 
1095  /* we got the full header. We parse it and get the payload */
1096  pes->state = MPEGTS_PAYLOAD;
1097  pes->data_index = 0;
1098  if (pes->stream_type == 0x12 && buf_size > 0) {
1099  int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1100  buf_size);
1101  pes->pes_header_size += sl_header_bytes;
1102  p += sl_header_bytes;
1103  buf_size -= sl_header_bytes;
1104  }
1105  if (pes->stream_type == 0x15 && buf_size >= 5) {
1106  /* skip metadata access unit header */
1107  pes->pes_header_size += 5;
1108  p += 5;
1109  buf_size -= 5;
1110  }
1111  if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1112  AVProgram *p = NULL;
1113  while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1114  if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1115  MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1116  if (f) {
1117  AVStream *st = NULL;
1118  if (f->type == MPEGTS_PES) {
1119  PESContext *pcrpes = f->u.pes_filter.opaque;
1120  if (pcrpes)
1121  st = pcrpes->st;
1122  } else if (f->type == MPEGTS_PCR) {
1123  int i;
1124  for (i = 0; i < p->nb_stream_indexes; i++) {
1125  AVStream *pst = pes->stream->streams[p->stream_index[i]];
1126  if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1127  st = pst;
1128  }
1129  }
1130  if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1131  // teletext packets do not always have correct timestamps,
1132  // the standard says they should be handled after 40.6 ms at most,
1133  // and the pcr error to this packet should be no more than 100 ms.
1134  // TODO: we should interpolate the PCR, not just use the last one
1135  int64_t pcr = f->last_pcr / 300;
1138  if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1139  pes->pts = pes->dts = pcr;
1140  } else if (pes->dts > pcr + 3654 + 9000) {
1141  pes->pts = pes->dts = pcr + 3654 + 9000;
1142  }
1143  break;
1144  }
1145  }
1146  }
1147  }
1148  }
1149  }
1150  break;
1151  case MPEGTS_PAYLOAD:
1152  if (pes->buffer) {
1153  if (pes->data_index > 0 &&
1154  pes->data_index + buf_size > pes->total_size) {
1155  new_pes_packet(pes, ts->pkt);
1156  pes->total_size = MAX_PES_PAYLOAD;
1157  pes->buffer = av_buffer_alloc(pes->total_size +
1159  if (!pes->buffer)
1160  return AVERROR(ENOMEM);
1161  ts->stop_parse = 1;
1162  } else if (pes->data_index == 0 &&
1163  buf_size > pes->total_size) {
1164  // pes packet size is < ts size packet and pes data is padded with 0xff
1165  // not sure if this is legal in ts but see issue #2392
1166  buf_size = pes->total_size;
1167  }
1168  memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1169  pes->data_index += buf_size;
1170  /* emit complete packets with known packet size
1171  * decreases demuxer delay for infrequent packets like subtitles from
1172  * a couple of seconds to milliseconds for properly muxed files.
1173  * total_size is the number of bytes following pes_packet_length
1174  * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1175  if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1176  pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1177  ts->stop_parse = 1;
1178  new_pes_packet(pes, ts->pkt);
1179  }
1180  }
1181  buf_size = 0;
1182  break;
1183  case MPEGTS_SKIP:
1184  buf_size = 0;
1185  break;
1186  }
1187  }
1188 
1189  return 0;
1190 }
1191 
1192 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1193 {
1194  MpegTSFilter *tss;
1195  PESContext *pes;
1196 
1197  /* if no pid found, then add a pid context */
1198  pes = av_mallocz(sizeof(PESContext));
1199  if (!pes)
1200  return 0;
1201  pes->ts = ts;
1202  pes->stream = ts->stream;
1203  pes->pid = pid;
1204  pes->pcr_pid = pcr_pid;
1205  pes->state = MPEGTS_SKIP;
1206  pes->pts = AV_NOPTS_VALUE;
1207  pes->dts = AV_NOPTS_VALUE;
1208  tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1209  if (!tss) {
1210  av_free(pes);
1211  return 0;
1212  }
1213  return pes;
1214 }
1215 
1216 #define MAX_LEVEL 4
1217 typedef struct {
1224  int level;
1227 
1229  const uint8_t *buf, unsigned size,
1230  Mp4Descr *descr, int max_descr_count)
1231 {
1232  int ret;
1233  if (size > (1 << 30))
1234  return AVERROR_INVALIDDATA;
1235 
1236  if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1237  NULL, NULL, NULL, NULL)) < 0)
1238  return ret;
1239 
1240  d->s = s;
1241  d->level = 0;
1242  d->descr_count = 0;
1243  d->descr = descr;
1244  d->active_descr = NULL;
1245  d->max_descr_count = max_descr_count;
1246 
1247  return 0;
1248 }
1249 
1250 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1251 {
1252  int64_t new_off = avio_tell(pb);
1253  (*len) -= new_off - *off;
1254  *off = new_off;
1255 }
1256 
1257 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1258  int target_tag);
1259 
1260 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1261 {
1262  while (len > 0) {
1263  int ret = parse_mp4_descr(d, off, len, 0);
1264  if (ret < 0)
1265  return ret;
1266  update_offsets(&d->pb, &off, &len);
1267  }
1268  return 0;
1269 }
1270 
1271 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1272 {
1273  avio_rb16(&d->pb); // ID
1274  avio_r8(&d->pb);
1275  avio_r8(&d->pb);
1276  avio_r8(&d->pb);
1277  avio_r8(&d->pb);
1278  avio_r8(&d->pb);
1279  update_offsets(&d->pb, &off, &len);
1280  return parse_mp4_descr_arr(d, off, len);
1281 }
1282 
1283 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1284 {
1285  int id_flags;
1286  if (len < 2)
1287  return 0;
1288  id_flags = avio_rb16(&d->pb);
1289  if (!(id_flags & 0x0020)) { // URL_Flag
1290  update_offsets(&d->pb, &off, &len);
1291  return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1292  } else {
1293  return 0;
1294  }
1295 }
1296 
1297 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1298 {
1299  int es_id = 0;
1300  if (d->descr_count >= d->max_descr_count)
1301  return AVERROR_INVALIDDATA;
1302  ff_mp4_parse_es_descr(&d->pb, &es_id);
1303  d->active_descr = d->descr + (d->descr_count++);
1304 
1305  d->active_descr->es_id = es_id;
1306  update_offsets(&d->pb, &off, &len);
1307  parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1308  update_offsets(&d->pb, &off, &len);
1309  if (len > 0)
1310  parse_mp4_descr(d, off, len, MP4SLDescrTag);
1311  d->active_descr = NULL;
1312  return 0;
1313 }
1314 
1316  int len)
1317 {
1318  Mp4Descr *descr = d->active_descr;
1319  if (!descr)
1320  return AVERROR_INVALIDDATA;
1322  if (!descr->dec_config_descr)
1323  return AVERROR(ENOMEM);
1324  descr->dec_config_descr_len = len;
1325  avio_read(&d->pb, descr->dec_config_descr, len);
1326  return 0;
1327 }
1328 
1329 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1330 {
1331  Mp4Descr *descr = d->active_descr;
1332  int predefined;
1333  if (!descr)
1334  return AVERROR_INVALIDDATA;
1335 
1336  predefined = avio_r8(&d->pb);
1337  if (!predefined) {
1338  int lengths;
1339  int flags = avio_r8(&d->pb);
1340  descr->sl.use_au_start = !!(flags & 0x80);
1341  descr->sl.use_au_end = !!(flags & 0x40);
1342  descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1343  descr->sl.use_padding = !!(flags & 0x08);
1344  descr->sl.use_timestamps = !!(flags & 0x04);
1345  descr->sl.use_idle = !!(flags & 0x02);
1346  descr->sl.timestamp_res = avio_rb32(&d->pb);
1347  avio_rb32(&d->pb);
1348  descr->sl.timestamp_len = avio_r8(&d->pb);
1349  if (descr->sl.timestamp_len > 64) {
1350  avpriv_request_sample(NULL, "timestamp_len > 64");
1351  descr->sl.timestamp_len = 64;
1352  return AVERROR_PATCHWELCOME;
1353  }
1354  descr->sl.ocr_len = avio_r8(&d->pb);
1355  descr->sl.au_len = avio_r8(&d->pb);
1356  descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1357  lengths = avio_rb16(&d->pb);
1358  descr->sl.degr_prior_len = lengths >> 12;
1359  descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1360  descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1361  } else if (!d->predefined_SLConfigDescriptor_seen){
1362  avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1364  }
1365  return 0;
1366 }
1367 
1368 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1369  int target_tag)
1370 {
1371  int tag;
1372  int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1373  update_offsets(&d->pb, &off, &len);
1374  if (len < 0 || len1 > len || len1 <= 0) {
1375  av_log(d->s, AV_LOG_ERROR,
1376  "Tag %x length violation new length %d bytes remaining %d\n",
1377  tag, len1, len);
1378  return AVERROR_INVALIDDATA;
1379  }
1380 
1381  if (d->level++ >= MAX_LEVEL) {
1382  av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1383  goto done;
1384  }
1385 
1386  if (target_tag && tag != target_tag) {
1387  av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1388  target_tag);
1389  goto done;
1390  }
1391 
1392  switch (tag) {
1393  case MP4IODescrTag:
1394  parse_MP4IODescrTag(d, off, len1);
1395  break;
1396  case MP4ODescrTag:
1397  parse_MP4ODescrTag(d, off, len1);
1398  break;
1399  case MP4ESDescrTag:
1400  parse_MP4ESDescrTag(d, off, len1);
1401  break;
1402  case MP4DecConfigDescrTag:
1403  parse_MP4DecConfigDescrTag(d, off, len1);
1404  break;
1405  case MP4SLDescrTag:
1406  parse_MP4SLDescrTag(d, off, len1);
1407  break;
1408  }
1409 
1410 
1411 done:
1412  d->level--;
1413  avio_seek(&d->pb, off + len1, SEEK_SET);
1414  return 0;
1415 }
1416 
1417 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1418  Mp4Descr *descr, int *descr_count, int max_descr_count)
1419 {
1421  int ret;
1422 
1423  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1424  if (ret < 0)
1425  return ret;
1426 
1427  ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1428 
1429  *descr_count = d.descr_count;
1430  return ret;
1431 }
1432 
1433 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1434  Mp4Descr *descr, int *descr_count, int max_descr_count)
1435 {
1437  int ret;
1438 
1439  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1440  if (ret < 0)
1441  return ret;
1442 
1443  ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1444 
1445  *descr_count = d.descr_count;
1446  return ret;
1447 }
1448 
1450  int section_len)
1451 {
1452  MpegTSContext *ts = filter->u.section_filter.opaque;
1453  SectionHeader h;
1454  const uint8_t *p, *p_end;
1455  AVIOContext pb;
1456  int mp4_descr_count = 0;
1457  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1458  int i, pid;
1459  AVFormatContext *s = ts->stream;
1460 
1461  p_end = section + section_len - 4;
1462  p = section;
1463  if (parse_section_header(&h, &p, p_end) < 0)
1464  return;
1465  if (h.tid != M4OD_TID)
1466  return;
1467 
1468  mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1470 
1471  for (pid = 0; pid < NB_PID_MAX; pid++) {
1472  if (!ts->pids[pid])
1473  continue;
1474  for (i = 0; i < mp4_descr_count; i++) {
1475  PESContext *pes;
1476  AVStream *st;
1477  if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1478  continue;
1479  if (ts->pids[pid]->type != MPEGTS_PES) {
1480  av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1481  continue;
1482  }
1483  pes = ts->pids[pid]->u.pes_filter.opaque;
1484  st = pes->st;
1485  if (!st)
1486  continue;
1487 
1488  pes->sl = mp4_descr[i].sl;
1489 
1490  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1491  mp4_descr[i].dec_config_descr_len, 0,
1492  NULL, NULL, NULL, NULL);
1493  ff_mp4_read_dec_config_descr(s, st, &pb);
1494  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1495  st->codec->extradata_size > 0)
1496  st->need_parsing = 0;
1497  if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1498  st->codec->extradata_size > 0)
1499  st->need_parsing = 0;
1500 
1501  if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1502  // do nothing
1503  } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1505  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1507  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1509  }
1510  }
1511  for (i = 0; i < mp4_descr_count; i++)
1512  av_free(mp4_descr[i].dec_config_descr);
1513 }
1514 
1516  1, 0, 1, 1, 2, 2, 2, 3, 3
1517 };
1518 
1519 static const uint8_t opus_stream_cnt[9] = {
1520  1, 1, 1, 2, 2, 3, 4, 4, 5,
1521 };
1522 
1523 static const uint8_t opus_channel_map[8][8] = {
1524  { 0 },
1525  { 0,1 },
1526  { 0,2,1 },
1527  { 0,1,2,3 },
1528  { 0,4,1,2,3 },
1529  { 0,4,1,2,3,5 },
1530  { 0,4,1,2,3,5,6 },
1531  { 0,6,1,2,3,4,5,7 },
1532 };
1533 
1535  const uint8_t **pp, const uint8_t *desc_list_end,
1536  Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1537  MpegTSContext *ts)
1538 {
1539  const uint8_t *desc_end;
1540  int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1541  char language[252];
1542  int i;
1543 
1544  desc_tag = get8(pp, desc_list_end);
1545  if (desc_tag < 0)
1546  return AVERROR_INVALIDDATA;
1547  desc_len = get8(pp, desc_list_end);
1548  if (desc_len < 0)
1549  return AVERROR_INVALIDDATA;
1550  desc_end = *pp + desc_len;
1551  if (desc_end > desc_list_end)
1552  return AVERROR_INVALIDDATA;
1553 
1554  av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1555 
1556  if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1557  stream_type == STREAM_TYPE_PRIVATE_DATA)
1558  mpegts_find_stream_type(st, desc_tag, DESC_types);
1559 
1560  switch (desc_tag) {
1561  case 0x1E: /* SL descriptor */
1562  desc_es_id = get16(pp, desc_end);
1563  if (desc_es_id < 0)
1564  break;
1565  if (ts && ts->pids[pid])
1566  ts->pids[pid]->es_id = desc_es_id;
1567  for (i = 0; i < mp4_descr_count; i++)
1568  if (mp4_descr[i].dec_config_descr_len &&
1569  mp4_descr[i].es_id == desc_es_id) {
1570  AVIOContext pb;
1571  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1572  mp4_descr[i].dec_config_descr_len, 0,
1573  NULL, NULL, NULL, NULL);
1574  ff_mp4_read_dec_config_descr(fc, st, &pb);
1575  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1576  st->codec->extradata_size > 0)
1577  st->need_parsing = 0;
1579  mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1580  }
1581  break;
1582  case 0x1F: /* FMC descriptor */
1583  if (get16(pp, desc_end) < 0)
1584  break;
1585  if (mp4_descr_count > 0 &&
1586  (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1587  mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1588  AVIOContext pb;
1589  ffio_init_context(&pb, mp4_descr->dec_config_descr,
1590  mp4_descr->dec_config_descr_len, 0,
1591  NULL, NULL, NULL, NULL);
1592  ff_mp4_read_dec_config_descr(fc, st, &pb);
1593  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1594  st->codec->extradata_size > 0) {
1595  st->request_probe = st->need_parsing = 0;
1597  }
1598  }
1599  break;
1600  case 0x56: /* DVB teletext descriptor */
1601  {
1602  uint8_t *extradata = NULL;
1603  int language_count = desc_len / 5;
1604 
1605  if (desc_len > 0 && desc_len % 5 != 0)
1606  return AVERROR_INVALIDDATA;
1607 
1608  if (language_count > 0) {
1609  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1610  if (language_count > sizeof(language) / 4) {
1611  language_count = sizeof(language) / 4;
1612  }
1613 
1614  if (st->codec->extradata == NULL) {
1615  if (ff_alloc_extradata(st->codec, language_count * 2)) {
1616  return AVERROR(ENOMEM);
1617  }
1618  }
1619 
1620  if (st->codec->extradata_size < language_count * 2)
1621  return AVERROR_INVALIDDATA;
1622 
1623  extradata = st->codec->extradata;
1624 
1625  for (i = 0; i < language_count; i++) {
1626  language[i * 4 + 0] = get8(pp, desc_end);
1627  language[i * 4 + 1] = get8(pp, desc_end);
1628  language[i * 4 + 2] = get8(pp, desc_end);
1629  language[i * 4 + 3] = ',';
1630 
1631  memcpy(extradata, *pp, 2);
1632  extradata += 2;
1633 
1634  *pp += 2;
1635  }
1636 
1637  language[i * 4 - 1] = 0;
1638  av_dict_set(&st->metadata, "language", language, 0);
1639  }
1640  }
1641  break;
1642  case 0x59: /* subtitling descriptor */
1643  {
1644  /* 8 bytes per DVB subtitle substream data:
1645  * ISO_639_language_code (3 bytes),
1646  * subtitling_type (1 byte),
1647  * composition_page_id (2 bytes),
1648  * ancillary_page_id (2 bytes) */
1649  int language_count = desc_len / 8;
1650 
1651  if (desc_len > 0 && desc_len % 8 != 0)
1652  return AVERROR_INVALIDDATA;
1653 
1654  if (language_count > 1) {
1655  avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1656  }
1657 
1658  if (language_count > 0) {
1659  uint8_t *extradata;
1660 
1661  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1662  if (language_count > sizeof(language) / 4) {
1663  language_count = sizeof(language) / 4;
1664  }
1665 
1666  if (st->codec->extradata == NULL) {
1667  if (ff_alloc_extradata(st->codec, language_count * 5)) {
1668  return AVERROR(ENOMEM);
1669  }
1670  }
1671 
1672  if (st->codec->extradata_size < language_count * 5)
1673  return AVERROR_INVALIDDATA;
1674 
1675  extradata = st->codec->extradata;
1676 
1677  for (i = 0; i < language_count; i++) {
1678  language[i * 4 + 0] = get8(pp, desc_end);
1679  language[i * 4 + 1] = get8(pp, desc_end);
1680  language[i * 4 + 2] = get8(pp, desc_end);
1681  language[i * 4 + 3] = ',';
1682 
1683  /* hearing impaired subtitles detection using subtitling_type */
1684  switch (*pp[0]) {
1685  case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1686  case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1687  case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1688  case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1689  case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1690  case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1692  break;
1693  }
1694 
1695  extradata[4] = get8(pp, desc_end); /* subtitling_type */
1696  memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1697  extradata += 5;
1698 
1699  *pp += 4;
1700  }
1701 
1702  language[i * 4 - 1] = 0;
1703  av_dict_set(&st->metadata, "language", language, 0);
1704  }
1705  }
1706  break;
1707  case 0x0a: /* ISO 639 language descriptor */
1708  for (i = 0; i + 4 <= desc_len; i += 4) {
1709  language[i + 0] = get8(pp, desc_end);
1710  language[i + 1] = get8(pp, desc_end);
1711  language[i + 2] = get8(pp, desc_end);
1712  language[i + 3] = ',';
1713  switch (get8(pp, desc_end)) {
1714  case 0x01:
1716  break;
1717  case 0x02:
1719  break;
1720  case 0x03:
1722  break;
1723  }
1724  }
1725  if (i && language[0]) {
1726  language[i - 1] = 0;
1727  av_dict_set(&st->metadata, "language", language, 0);
1728  }
1729  break;
1730  case 0x05: /* registration descriptor */
1731  st->codec->codec_tag = bytestream_get_le32(pp);
1732  av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1733  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1734  mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1735  break;
1736  case 0x52: /* stream identifier descriptor */
1737  st->stream_identifier = 1 + get8(pp, desc_end);
1738  break;
1739  case 0x26: /* metadata descriptor */
1740  if (get16(pp, desc_end) == 0xFFFF)
1741  *pp += 4;
1742  if (get8(pp, desc_end) == 0xFF) {
1743  st->codec->codec_tag = bytestream_get_le32(pp);
1744  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1745  mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1746  }
1747  break;
1748  case 0x7f: /* DVB extension descriptor */
1749  ext_desc_tag = get8(pp, desc_end);
1750  if (ext_desc_tag < 0)
1751  return AVERROR_INVALIDDATA;
1752  if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1753  ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1754  if (!st->codec->extradata) {
1757  if (!st->codec->extradata)
1758  return AVERROR(ENOMEM);
1759 
1762 
1763  channel_config_code = get8(pp, desc_end);
1764  if (channel_config_code < 0)
1765  return AVERROR_INVALIDDATA;
1766  if (channel_config_code <= 0x8) {
1767  st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1768  st->codec->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
1769  st->codec->extradata[19] = opus_stream_cnt[channel_config_code];
1770  st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1771  memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1772  } else {
1773  avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1774  }
1776  }
1777  }
1778  break;
1779  default:
1780  break;
1781  }
1782  *pp = desc_end;
1783  return 0;
1784 }
1785 
1786 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1787 {
1788  MpegTSContext *ts = filter->u.section_filter.opaque;
1789  SectionHeader h1, *h = &h1;
1790  PESContext *pes;
1791  AVStream *st;
1792  const uint8_t *p, *p_end, *desc_list_end;
1793  int program_info_length, pcr_pid, pid, stream_type;
1794  int desc_list_len;
1795  uint32_t prog_reg_desc = 0; /* registration descriptor */
1796 
1797  int mp4_descr_count = 0;
1798  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1799  int i;
1800 
1801  av_dlog(ts->stream, "PMT: len %i\n", section_len);
1802  hex_dump_debug(ts->stream, section, section_len);
1803 
1804  p_end = section + section_len - 4;
1805  p = section;
1806  if (parse_section_header(h, &p, p_end) < 0)
1807  return;
1808 
1809  av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d version=%d\n",
1810  h->id, h->sec_num, h->last_sec_num, h->version);
1811 
1812  if (h->tid != PMT_TID)
1813  return;
1814  if (!ts->scan_all_pmts && ts->skip_changes)
1815  return;
1816 
1817  if (!ts->skip_clear)
1818  clear_program(ts, h->id);
1819 
1820  pcr_pid = get16(&p, p_end);
1821  if (pcr_pid < 0)
1822  return;
1823  pcr_pid &= 0x1fff;
1824  add_pid_to_pmt(ts, h->id, pcr_pid);
1825  set_pcr_pid(ts->stream, h->id, pcr_pid);
1826 
1827  av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1828 
1829  program_info_length = get16(&p, p_end);
1830  if (program_info_length < 0)
1831  return;
1832  program_info_length &= 0xfff;
1833  while (program_info_length >= 2) {
1834  uint8_t tag, len;
1835  tag = get8(&p, p_end);
1836  len = get8(&p, p_end);
1837 
1838  av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1839 
1840  if (len > program_info_length - 2)
1841  // something else is broken, exit the program_descriptors_loop
1842  break;
1843  program_info_length -= len + 2;
1844  if (tag == 0x1d) { // IOD descriptor
1845  get8(&p, p_end); // scope
1846  get8(&p, p_end); // label
1847  len -= 2;
1848  mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1849  &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1850  } else if (tag == 0x05 && len >= 4) { // registration descriptor
1851  prog_reg_desc = bytestream_get_le32(&p);
1852  len -= 4;
1853  }
1854  p += len;
1855  }
1856  p += program_info_length;
1857  if (p >= p_end)
1858  goto out;
1859 
1860  // stop parsing after pmt, we found header
1861  if (!ts->stream->nb_streams)
1862  ts->stop_parse = 2;
1863 
1864  set_pmt_found(ts, h->id);
1865 
1866 
1867  for (;;) {
1868  st = 0;
1869  pes = NULL;
1870  stream_type = get8(&p, p_end);
1871  if (stream_type < 0)
1872  break;
1873  pid = get16(&p, p_end);
1874  if (pid < 0)
1875  goto out;
1876  pid &= 0x1fff;
1877  if (pid == ts->current_pid)
1878  goto out;
1879 
1880  /* now create stream */
1881  if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1882  pes = ts->pids[pid]->u.pes_filter.opaque;
1883  if (!pes->st) {
1884  pes->st = avformat_new_stream(pes->stream, NULL);
1885  if (!pes->st)
1886  goto out;
1887  pes->st->id = pes->pid;
1888  }
1889  st = pes->st;
1890  } else if (stream_type != 0x13) {
1891  if (ts->pids[pid])
1892  mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1893  pes = add_pes_stream(ts, pid, pcr_pid);
1894  if (pes) {
1895  st = avformat_new_stream(pes->stream, NULL);
1896  if (!st)
1897  goto out;
1898  st->id = pes->pid;
1899  }
1900  } else {
1901  int idx = ff_find_stream_index(ts->stream, pid);
1902  if (idx >= 0) {
1903  st = ts->stream->streams[idx];
1904  } else {
1905  st = avformat_new_stream(ts->stream, NULL);
1906  if (!st)
1907  goto out;
1908  st->id = pid;
1910  }
1911  }
1912 
1913  if (!st)
1914  goto out;
1915 
1916  if (pes && !pes->stream_type)
1917  mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1918 
1919  add_pid_to_pmt(ts, h->id, pid);
1920 
1922 
1923  desc_list_len = get16(&p, p_end);
1924  if (desc_list_len < 0)
1925  goto out;
1926  desc_list_len &= 0xfff;
1927  desc_list_end = p + desc_list_len;
1928  if (desc_list_end > p_end)
1929  goto out;
1930  for (;;) {
1931  if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1932  desc_list_end, mp4_descr,
1933  mp4_descr_count, pid, ts) < 0)
1934  break;
1935 
1936  if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1937  stream_type == 0x83 && pes->sub_st) {
1939  pes->sub_st->index);
1940  pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1941  }
1942  }
1943  p = desc_list_end;
1944  }
1945 
1946  if (!ts->pids[pcr_pid])
1947  mpegts_open_pcr_filter(ts, pcr_pid);
1948 
1949 out:
1950  for (i = 0; i < mp4_descr_count; i++)
1951  av_free(mp4_descr[i].dec_config_descr);
1952 }
1953 
1954 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1955 {
1956  MpegTSContext *ts = filter->u.section_filter.opaque;
1957  SectionHeader h1, *h = &h1;
1958  const uint8_t *p, *p_end;
1959  int sid, pmt_pid;
1960  AVProgram *program;
1961 
1962  av_dlog(ts->stream, "PAT:\n");
1963  hex_dump_debug(ts->stream, section, section_len);
1964 
1965  p_end = section + section_len - 4;
1966  p = section;
1967  if (parse_section_header(h, &p, p_end) < 0)
1968  return;
1969  if (h->tid != PAT_TID)
1970  return;
1971  if (ts->skip_changes)
1972  return;
1973 
1974  ts->stream->ts_id = h->id;
1975 
1976  clear_programs(ts);
1977  for (;;) {
1978  sid = get16(&p, p_end);
1979  if (sid < 0)
1980  break;
1981  pmt_pid = get16(&p, p_end);
1982  if (pmt_pid < 0)
1983  break;
1984  pmt_pid &= 0x1fff;
1985 
1986  if (pmt_pid == ts->current_pid)
1987  break;
1988 
1989  av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1990 
1991  if (sid == 0x0000) {
1992  /* NIT info */
1993  } else {
1994  MpegTSFilter *fil = ts->pids[pmt_pid];
1995  program = av_new_program(ts->stream, sid);
1996  if (program) {
1997  program->program_num = sid;
1998  program->pmt_pid = pmt_pid;
1999  }
2000  if (fil)
2001  if ( fil->type != MPEGTS_SECTION
2002  || fil->pid != pmt_pid
2003  || fil->u.section_filter.section_cb != pmt_cb)
2004  mpegts_close_filter(ts, ts->pids[pmt_pid]);
2005 
2006  if (!ts->pids[pmt_pid])
2007  mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2008  add_pat_entry(ts, sid);
2009  add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2010  add_pid_to_pmt(ts, sid, pmt_pid);
2011  }
2012  }
2013 
2014  if (sid < 0) {
2015  int i,j;
2016  for (j=0; j<ts->stream->nb_programs; j++) {
2017  for (i = 0; i < ts->nb_prg; i++)
2018  if (ts->prg[i].id == ts->stream->programs[j]->id)
2019  break;
2020  if (i==ts->nb_prg && !ts->skip_clear)
2021  clear_avprogram(ts, ts->stream->programs[j]->id);
2022  }
2023  }
2024 }
2025 
2026 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2027 {
2028  MpegTSContext *ts = filter->u.section_filter.opaque;
2029  SectionHeader h1, *h = &h1;
2030  const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2031  int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2032  char *name, *provider_name;
2033 
2034  av_dlog(ts->stream, "SDT:\n");
2035  hex_dump_debug(ts->stream, section, section_len);
2036 
2037  p_end = section + section_len - 4;
2038  p = section;
2039  if (parse_section_header(h, &p, p_end) < 0)
2040  return;
2041  if (h->tid != SDT_TID)
2042  return;
2043  if (ts->skip_changes)
2044  return;
2045  onid = get16(&p, p_end);
2046  if (onid < 0)
2047  return;
2048  val = get8(&p, p_end);
2049  if (val < 0)
2050  return;
2051  for (;;) {
2052  sid = get16(&p, p_end);
2053  if (sid < 0)
2054  break;
2055  val = get8(&p, p_end);
2056  if (val < 0)
2057  break;
2058  desc_list_len = get16(&p, p_end);
2059  if (desc_list_len < 0)
2060  break;
2061  desc_list_len &= 0xfff;
2062  desc_list_end = p + desc_list_len;
2063  if (desc_list_end > p_end)
2064  break;
2065  for (;;) {
2066  desc_tag = get8(&p, desc_list_end);
2067  if (desc_tag < 0)
2068  break;
2069  desc_len = get8(&p, desc_list_end);
2070  desc_end = p + desc_len;
2071  if (desc_len < 0 || desc_end > desc_list_end)
2072  break;
2073 
2074  av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
2075  desc_tag, desc_len);
2076 
2077  switch (desc_tag) {
2078  case 0x48:
2079  service_type = get8(&p, p_end);
2080  if (service_type < 0)
2081  break;
2082  provider_name = getstr8(&p, p_end);
2083  if (!provider_name)
2084  break;
2085  name = getstr8(&p, p_end);
2086  if (name) {
2087  AVProgram *program = av_new_program(ts->stream, sid);
2088  if (program) {
2089  av_dict_set(&program->metadata, "service_name", name, 0);
2090  av_dict_set(&program->metadata, "service_provider",
2091  provider_name, 0);
2092  }
2093  }
2094  av_free(name);
2095  av_free(provider_name);
2096  break;
2097  default:
2098  break;
2099  }
2100  p = desc_end;
2101  }
2102  p = desc_list_end;
2103  }
2104 }
2105 
2106 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2107  const uint8_t *packet);
2108 
2109 /* handle one TS packet */
2110 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2111 {
2112  MpegTSFilter *tss;
2113  int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2114  has_adaptation, has_payload;
2115  const uint8_t *p, *p_end;
2116  int64_t pos;
2117 
2118  pid = AV_RB16(packet + 1) & 0x1fff;
2119  if (pid && discard_pid(ts, pid))
2120  return 0;
2121  is_start = packet[1] & 0x40;
2122  tss = ts->pids[pid];
2123  if (ts->auto_guess && !tss && is_start) {
2124  add_pes_stream(ts, pid, -1);
2125  tss = ts->pids[pid];
2126  }
2127  if (!tss)
2128  return 0;
2129  ts->current_pid = pid;
2130 
2131  afc = (packet[3] >> 4) & 3;
2132  if (afc == 0) /* reserved value */
2133  return 0;
2134  has_adaptation = afc & 2;
2135  has_payload = afc & 1;
2136  is_discontinuity = has_adaptation &&
2137  packet[4] != 0 && /* with length > 0 */
2138  (packet[5] & 0x80); /* and discontinuity indicated */
2139 
2140  /* continuity check (currently not used) */
2141  cc = (packet[3] & 0xf);
2142  expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2143  cc_ok = pid == 0x1FFF || // null packet PID
2144  is_discontinuity ||
2145  tss->last_cc < 0 ||
2146  expected_cc == cc;
2147 
2148  tss->last_cc = cc;
2149  if (!cc_ok) {
2150  av_log(ts->stream, AV_LOG_DEBUG,
2151  "Continuity check failed for pid %d expected %d got %d\n",
2152  pid, expected_cc, cc);
2153  if (tss->type == MPEGTS_PES) {
2154  PESContext *pc = tss->u.pes_filter.opaque;
2155  pc->flags |= AV_PKT_FLAG_CORRUPT;
2156  }
2157  }
2158 
2159  p = packet + 4;
2160  if (has_adaptation) {
2161  int64_t pcr_h;
2162  int pcr_l;
2163  if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2164  tss->last_pcr = pcr_h * 300 + pcr_l;
2165  /* skip adaptation field */
2166  p += p[0] + 1;
2167  }
2168  /* if past the end of packet, ignore */
2169  p_end = packet + TS_PACKET_SIZE;
2170  if (p >= p_end || !has_payload)
2171  return 0;
2172 
2173  pos = avio_tell(ts->stream->pb);
2174  if (pos >= 0) {
2175  av_assert0(pos >= TS_PACKET_SIZE);
2176  ts->pos47_full = pos - TS_PACKET_SIZE;
2177  }
2178 
2179  if (tss->type == MPEGTS_SECTION) {
2180  if (is_start) {
2181  /* pointer field present */
2182  len = *p++;
2183  if (p + len > p_end)
2184  return 0;
2185  if (len && cc_ok) {
2186  /* write remaining section bytes */
2187  write_section_data(ts, tss,
2188  p, len, 0);
2189  /* check whether filter has been closed */
2190  if (!ts->pids[pid])
2191  return 0;
2192  }
2193  p += len;
2194  if (p < p_end) {
2195  write_section_data(ts, tss,
2196  p, p_end - p, 1);
2197  }
2198  } else {
2199  if (cc_ok) {
2200  write_section_data(ts, tss,
2201  p, p_end - p, 0);
2202  }
2203  }
2204 
2205  // stop find_stream_info from waiting for more streams
2206  // when all programs have received a PMT
2207  if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2208  int i;
2209  for (i = 0; i < ts->nb_prg; i++) {
2210  if (!ts->prg[i].pmt_found)
2211  break;
2212  }
2213  if (i == ts->nb_prg && ts->nb_prg > 0) {
2214  int types = 0;
2215  for (i = 0; i < ts->stream->nb_streams; i++) {
2216  AVStream *st = ts->stream->streams[i];
2217  types |= 1<<st->codec->codec_type;
2218  }
2219  if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2220  av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2222  }
2223  }
2224  }
2225 
2226  } else {
2227  int ret;
2228  // Note: The position here points actually behind the current packet.
2229  if (tss->type == MPEGTS_PES) {
2230  if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2231  pos - ts->raw_packet_size)) < 0)
2232  return ret;
2233  }
2234  }
2235 
2236  return 0;
2237 }
2238 
2239 static void reanalyze(MpegTSContext *ts) {
2240  AVIOContext *pb = ts->stream->pb;
2241  int64_t pos = avio_tell(pb);
2242  if (pos < 0)
2243  return;
2244  pos -= ts->pos47_full;
2245  if (pos == TS_PACKET_SIZE) {
2246  ts->size_stat[0] ++;
2247  } else if (pos == TS_DVHS_PACKET_SIZE) {
2248  ts->size_stat[1] ++;
2249  } else if (pos == TS_FEC_PACKET_SIZE) {
2250  ts->size_stat[2] ++;
2251  }
2252 
2253  ts->size_stat_count ++;
2255  int newsize = 0;
2256  if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2257  newsize = TS_PACKET_SIZE;
2258  } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2259  newsize = TS_DVHS_PACKET_SIZE;
2260  } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2261  newsize = TS_FEC_PACKET_SIZE;
2262  }
2263  if (newsize && newsize != ts->raw_packet_size) {
2264  av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2265  ts->raw_packet_size = newsize;
2266  }
2267  ts->size_stat_count = 0;
2268  memset(ts->size_stat, 0, sizeof(ts->size_stat));
2269  }
2270 }
2271 
2272 /* XXX: try to find a better synchro over several packets (use
2273  * get_packet_size() ?) */
2275 {
2276  MpegTSContext *ts = s->priv_data;
2277  AVIOContext *pb = s->pb;
2278  int c, i;
2279 
2280  for (i = 0; i < ts->resync_size; i++) {
2281  c = avio_r8(pb);
2282  if (avio_feof(pb))
2283  return AVERROR_EOF;
2284  if (c == 0x47) {
2285  avio_seek(pb, -1, SEEK_CUR);
2286  reanalyze(s->priv_data);
2287  return 0;
2288  }
2289  }
2290  av_log(s, AV_LOG_ERROR,
2291  "max resync size reached, could not find sync byte\n");
2292  /* no sync found */
2293  return AVERROR_INVALIDDATA;
2294 }
2295 
2296 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2297 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2298  const uint8_t **data)
2299 {
2300  AVIOContext *pb = s->pb;
2301  int len;
2302 
2303  for (;;) {
2304  len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2305  if (len != TS_PACKET_SIZE)
2306  return len < 0 ? len : AVERROR_EOF;
2307  /* check packet sync byte */
2308  if ((*data)[0] != 0x47) {
2309  /* find a new packet start */
2310  uint64_t pos = avio_tell(pb);
2311  avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2312 
2313  if (mpegts_resync(s) < 0)
2314  return AVERROR(EAGAIN);
2315  else
2316  continue;
2317  } else {
2318  break;
2319  }
2320  }
2321  return 0;
2322 }
2323 
2324 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2325 {
2326  AVIOContext *pb = s->pb;
2327  int skip = raw_packet_size - TS_PACKET_SIZE;
2328  if (skip > 0)
2329  avio_skip(pb, skip);
2330 }
2331 
2332 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2333 {
2334  AVFormatContext *s = ts->stream;
2336  const uint8_t *data;
2337  int64_t packet_num;
2338  int ret = 0;
2339 
2340  if (avio_tell(s->pb) != ts->last_pos) {
2341  int i;
2342  av_dlog(ts->stream, "Skipping after seek\n");
2343  /* seek detected, flush pes buffer */
2344  for (i = 0; i < NB_PID_MAX; i++) {
2345  if (ts->pids[i]) {
2346  if (ts->pids[i]->type == MPEGTS_PES) {
2347  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2348  av_buffer_unref(&pes->buffer);
2349  pes->data_index = 0;
2350  pes->state = MPEGTS_SKIP; /* skip until pes header */
2351  }
2352  ts->pids[i]->last_cc = -1;
2353  ts->pids[i]->last_pcr = -1;
2354  }
2355  }
2356  }
2357 
2358  ts->stop_parse = 0;
2359  packet_num = 0;
2360  memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2361  for (;;) {
2362  packet_num++;
2363  if (nb_packets != 0 && packet_num >= nb_packets ||
2364  ts->stop_parse > 1) {
2365  ret = AVERROR(EAGAIN);
2366  break;
2367  }
2368  if (ts->stop_parse > 0)
2369  break;
2370 
2371  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2372  if (ret != 0)
2373  break;
2374  ret = handle_packet(ts, data);
2376  if (ret != 0)
2377  break;
2378  }
2379  ts->last_pos = avio_tell(s->pb);
2380  return ret;
2381 }
2382 
2384 {
2385  const int size = p->buf_size;
2386  int maxscore = 0;
2387  int sumscore = 0;
2388  int i;
2389  int check_count = size / TS_FEC_PACKET_SIZE;
2390 #define CHECK_COUNT 10
2391 #define CHECK_BLOCK 100
2392 
2393  if (check_count < CHECK_COUNT)
2394  return AVERROR_INVALIDDATA;
2395 
2396  for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2397  int left = FFMIN(check_count - i, CHECK_BLOCK);
2398  int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2399  int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2400  int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2401  score = FFMAX3(score, dvhs_score, fec_score);
2402  sumscore += score;
2403  maxscore = FFMAX(maxscore, score);
2404  }
2405 
2406  sumscore = sumscore * CHECK_COUNT / check_count;
2407  maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2408 
2409  av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2410 
2411  if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2412  else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2413  else
2414  return AVERROR_INVALIDDATA;
2415 }
2416 
2417 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2418  * (-1) if not available */
2419 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2420 {
2421  int afc, len, flags;
2422  const uint8_t *p;
2423  unsigned int v;
2424 
2425  afc = (packet[3] >> 4) & 3;
2426  if (afc <= 1)
2427  return AVERROR_INVALIDDATA;
2428  p = packet + 4;
2429  len = p[0];
2430  p++;
2431  if (len == 0)
2432  return AVERROR_INVALIDDATA;
2433  flags = *p++;
2434  len--;
2435  if (!(flags & 0x10))
2436  return AVERROR_INVALIDDATA;
2437  if (len < 6)
2438  return AVERROR_INVALIDDATA;
2439  v = AV_RB32(p);
2440  *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2441  *ppcr_low = ((p[4] & 1) << 8) | p[5];
2442  return 0;
2443 }
2444 
2445 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2446 
2447  /* NOTE: We attempt to seek on non-seekable files as well, as the
2448  * probe buffer usually is big enough. Only warn if the seek failed
2449  * on files where the seek should work. */
2450  if (avio_seek(pb, pos, SEEK_SET) < 0)
2451  av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2452 }
2453 
2455 {
2456  MpegTSContext *ts = s->priv_data;
2457  AVIOContext *pb = s->pb;
2458  uint8_t buf[8 * 1024] = {0};
2459  int len;
2460  int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2461 
2462  if (ffio_ensure_seekback(pb, probesize) < 0)
2463  av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
2464 
2465  /* read the first 8192 bytes to get packet size */
2466  pos = avio_tell(pb);
2467  len = avio_read(pb, buf, sizeof(buf));
2468  ts->raw_packet_size = get_packet_size(buf, len);
2469  if (ts->raw_packet_size <= 0) {
2470  av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2472  }
2473  ts->stream = s;
2474  ts->auto_guess = 0;
2475 
2476  if (s->iformat == &ff_mpegts_demuxer) {
2477  /* normal demux */
2478 
2479  /* first do a scan to get all the services */
2480  seek_back(s, pb, pos);
2481 
2483 
2485 
2486  handle_packets(ts, probesize / ts->raw_packet_size);
2487  /* if could not find service, enable auto_guess */
2488 
2489  ts->auto_guess = 1;
2490 
2491  av_dlog(ts->stream, "tuning done\n");
2492 
2494  } else {
2495  AVStream *st;
2496  int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2497  int64_t pcrs[2], pcr_h;
2498  int packet_count[2];
2499  uint8_t packet[TS_PACKET_SIZE];
2500  const uint8_t *data;
2501 
2502  /* only read packets */
2503 
2504  st = avformat_new_stream(s, NULL);
2505  if (!st)
2506  return AVERROR(ENOMEM);
2507  avpriv_set_pts_info(st, 60, 1, 27000000);
2510 
2511  /* we iterate until we find two PCRs to estimate the bitrate */
2512  pcr_pid = -1;
2513  nb_pcrs = 0;
2514  nb_packets = 0;
2515  for (;;) {
2516  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2517  if (ret < 0)
2518  return ret;
2519  pid = AV_RB16(data + 1) & 0x1fff;
2520  if ((pcr_pid == -1 || pcr_pid == pid) &&
2521  parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2523  pcr_pid = pid;
2524  packet_count[nb_pcrs] = nb_packets;
2525  pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2526  nb_pcrs++;
2527  if (nb_pcrs >= 2)
2528  break;
2529  } else {
2531  }
2532  nb_packets++;
2533  }
2534 
2535  /* NOTE1: the bitrate is computed without the FEC */
2536  /* NOTE2: it is only the bitrate of the start of the stream */
2537  ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2538  ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2539  s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2540  st->codec->bit_rate = s->bit_rate;
2541  st->start_time = ts->cur_pcr;
2542  av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2543  st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2544  }
2545 
2546  seek_back(s, pb, pos);
2547  return 0;
2548 }
2549 
2550 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2551 
2553 {
2554  MpegTSContext *ts = s->priv_data;
2555  int ret, i;
2556  int64_t pcr_h, next_pcr_h, pos;
2557  int pcr_l, next_pcr_l;
2558  uint8_t pcr_buf[12];
2559  const uint8_t *data;
2560 
2561  if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2562  return AVERROR(ENOMEM);
2563  ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2564  pkt->pos = avio_tell(s->pb);
2565  if (ret < 0) {
2566  av_free_packet(pkt);
2567  return ret;
2568  }
2569  if (data != pkt->data)
2570  memcpy(pkt->data, data, ts->raw_packet_size);
2572  if (ts->mpeg2ts_compute_pcr) {
2573  /* compute exact PCR for each packet */
2574  if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2575  /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2576  pos = avio_tell(s->pb);
2577  for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2578  avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2579  avio_read(s->pb, pcr_buf, 12);
2580  if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2581  /* XXX: not precise enough */
2582  ts->pcr_incr =
2583  ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2584  (i + 1);
2585  break;
2586  }
2587  }
2588  avio_seek(s->pb, pos, SEEK_SET);
2589  /* no next PCR found: we use previous increment */
2590  ts->cur_pcr = pcr_h * 300 + pcr_l;
2591  }
2592  pkt->pts = ts->cur_pcr;
2593  pkt->duration = ts->pcr_incr;
2594  ts->cur_pcr += ts->pcr_incr;
2595  }
2596  pkt->stream_index = 0;
2597  return 0;
2598 }
2599 
2601 {
2602  MpegTSContext *ts = s->priv_data;
2603  int ret, i;
2604 
2605  pkt->size = -1;
2606  ts->pkt = pkt;
2607  ret = handle_packets(ts, 0);
2608  if (ret < 0) {
2609  av_free_packet(ts->pkt);
2610  /* flush pes data left */
2611  for (i = 0; i < NB_PID_MAX; i++)
2612  if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2613  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2614  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2615  new_pes_packet(pes, pkt);
2616  pes->state = MPEGTS_SKIP;
2617  ret = 0;
2618  break;
2619  }
2620  }
2621  }
2622 
2623  if (!ret && pkt->size < 0)
2624  ret = AVERROR(EINTR);
2625  return ret;
2626 }
2627 
2628 static void mpegts_free(MpegTSContext *ts)
2629 {
2630  int i;
2631 
2632  clear_programs(ts);
2633 
2634  for (i = 0; i < NB_PID_MAX; i++)
2635  if (ts->pids[i])
2636  mpegts_close_filter(ts, ts->pids[i]);
2637 }
2638 
2640 {
2641  MpegTSContext *ts = s->priv_data;
2642  mpegts_free(ts);
2643  return 0;
2644 }
2645 
2646 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2647  int64_t *ppos, int64_t pos_limit)
2648 {
2649  MpegTSContext *ts = s->priv_data;
2650  int64_t pos, timestamp;
2652  int pcr_l, pcr_pid =
2653  ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2654  int pos47 = ts->pos47_full % ts->raw_packet_size;
2655  pos =
2656  ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2657  ts->raw_packet_size + pos47;
2658  while(pos < pos_limit) {
2659  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2660  return AV_NOPTS_VALUE;
2661  if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2662  return AV_NOPTS_VALUE;
2663  if (buf[0] != 0x47) {
2664  avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2665  if (mpegts_resync(s) < 0)
2666  return AV_NOPTS_VALUE;
2667  pos = avio_tell(s->pb);
2668  continue;
2669  }
2670  if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2671  parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2672  *ppos = pos;
2673  return timestamp;
2674  }
2675  pos += ts->raw_packet_size;
2676  }
2677 
2678  return AV_NOPTS_VALUE;
2679 }
2680 
2681 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2682  int64_t *ppos, int64_t pos_limit)
2683 {
2684  MpegTSContext *ts = s->priv_data;
2685  int64_t pos;
2686  int pos47 = ts->pos47_full % ts->raw_packet_size;
2687  pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2689  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2690  return AV_NOPTS_VALUE;
2691  while(pos < pos_limit) {
2692  int ret;
2693  AVPacket pkt;
2694  av_init_packet(&pkt);
2695  ret = av_read_frame(s, &pkt);
2696  if (ret < 0)
2697  return AV_NOPTS_VALUE;
2698  av_free_packet(&pkt);
2699  if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2700  ff_reduce_index(s, pkt.stream_index);
2701  av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2702  if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2703  *ppos = pkt.pos;
2704  return pkt.dts;
2705  }
2706  }
2707  pos = pkt.pos;
2708  }
2709 
2710  return AV_NOPTS_VALUE;
2711 }
2712 
2713 /**************************************************************/
2714 /* parsing functions - called from other demuxers such as RTP */
2715 
2717 {
2718  MpegTSContext *ts;
2719 
2720  ts = av_mallocz(sizeof(MpegTSContext));
2721  if (!ts)
2722  return NULL;
2723  /* no stream case, currently used by RTP */
2725  ts->stream = s;
2726  ts->auto_guess = 1;
2729 
2730  return ts;
2731 }
2732 
2733 /* return the consumed length if a packet was output, or -1 if no
2734  * packet is output */
2736  const uint8_t *buf, int len)
2737 {
2738  int len1;
2739 
2740  len1 = len;
2741  ts->pkt = pkt;
2742  for (;;) {
2743  ts->stop_parse = 0;
2744  if (len < TS_PACKET_SIZE)
2745  return AVERROR_INVALIDDATA;
2746  if (buf[0] != 0x47) {
2747  buf++;
2748  len--;
2749  } else {
2750  handle_packet(ts, buf);
2751  buf += TS_PACKET_SIZE;
2752  len -= TS_PACKET_SIZE;
2753  if (ts->stop_parse == 1)
2754  break;
2755  }
2756  }
2757  return len1 - len;
2758 }
2759 
2761 {
2762  mpegts_free(ts);
2763  av_free(ts);
2764 }
2765 
2766 AVInputFormat ff_mpegts_demuxer = {
2767  .name = "mpegts",
2768  .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2769  .priv_data_size = sizeof(MpegTSContext),
2774  .read_timestamp = mpegts_get_dts,
2776  .priv_class = &mpegts_class,
2777 };
2778 
2780  .name = "mpegtsraw",
2781  .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2782  .priv_data_size = sizeof(MpegTSContext),
2786  .read_timestamp = mpegts_get_dts,
2788  .priv_class = &mpegtsraw_class,
2789 };