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mpegts.c
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1 /*
2  * MPEG2 transport stream (aka DVB) demuxer
3  * Copyright (c) 2002-2003 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/log.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/avassert.h"
30 #include "libavcodec/bytestream.h"
31 #include "libavcodec/get_bits.h"
32 #include "avformat.h"
33 #include "mpegts.h"
34 #include "internal.h"
35 #include "avio_internal.h"
36 #include "seek.h"
37 #include "mpeg.h"
38 #include "isom.h"
39 
40 /* maximum size in which we look for synchronisation if
41  * synchronisation is lost */
42 #define MAX_RESYNC_SIZE 65536
43 
44 #define MAX_PES_PAYLOAD 200 * 1024
45 
46 #define MAX_MP4_DESCR_COUNT 16
47 
48 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
49  do { \
50  if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
51  (modulus) = (dividend) % (divisor); \
52  (prev_dividend) = (dividend); \
53  } while (0)
54 
59 };
60 
61 typedef struct MpegTSFilter MpegTSFilter;
62 
63 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
64  int is_start, int64_t pos);
65 
66 typedef struct MpegTSPESFilter {
68  void *opaque;
70 
71 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
72 
73 typedef void SetServiceCallback (void *opaque, int ret);
74 
75 typedef struct MpegTSSectionFilter {
79  unsigned int check_crc : 1;
80  unsigned int end_of_section_reached : 1;
82  void *opaque;
84 
85 struct MpegTSFilter {
86  int pid;
87  int es_id;
88  int last_cc; /* last cc code (-1 if first packet) */
89  int64_t last_pcr;
91  union {
94  } u;
95 };
96 
97 #define MAX_PIDS_PER_PROGRAM 64
98 struct Program {
99  unsigned int id; // program id/service id
100  unsigned int nb_pids;
101  unsigned int pids[MAX_PIDS_PER_PROGRAM];
102 
103  /** have we found pmt for this program */
105 };
106 
108  const AVClass *class;
109  /* user data */
111  /** raw packet size, including FEC if present */
113 
114  int size_stat[3];
116 #define SIZE_STAT_THRESHOLD 10
117 
118  int64_t pos47_full;
119 
120  /** if true, all pids are analyzed to find streams */
122 
123  /** compute exact PCR for each transport stream packet */
125 
126  /** fix dvb teletext pts */
128 
129  int64_t cur_pcr; /**< used to estimate the exact PCR */
130  int pcr_incr; /**< used to estimate the exact PCR */
131 
132  /* data needed to handle file based ts */
133  /** stop parsing loop */
135  /** packet containing Audio/Video data */
137  /** to detect seek */
138  int64_t last_pos;
139 
142 
143  /******************************************/
144  /* private mpegts data */
145  /* scan context */
146  /** structure to keep track of Program->pids mapping */
147  unsigned int nb_prg;
148  struct Program *prg;
149 
151  /** filters for various streams specified by PMT + for the PAT and PMT */
154 };
155 
156 static const AVOption mpegtsraw_options[] = {
157  { "compute_pcr", "Compute exact PCR for each transport stream packet.",
158  offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
159  { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
160  { "ts_packetsize", "Output option carrying the raw packet size.",
161  offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
162  { .i64 = 0 }, 0, 0,
164  { NULL },
165 };
166 
167 static const AVClass mpegtsraw_class = {
168  .class_name = "mpegtsraw demuxer",
169  .item_name = av_default_item_name,
170  .option = mpegtsraw_options,
171  .version = LIBAVUTIL_VERSION_INT,
172 };
173 
174 static const AVOption mpegts_options[] = {
175  {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
176  {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
177  {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
179  {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
180  {.i64 = 0}, 0, 1, 0 },
181  {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
182  {.i64 = 0}, 0, 1, 0 },
183  { NULL },
184 };
185 
186 static const AVClass mpegts_class = {
187  .class_name = "mpegts demuxer",
188  .item_name = av_default_item_name,
189  .option = mpegts_options,
190  .version = LIBAVUTIL_VERSION_INT,
191 };
192 
193 /* TS stream handling */
194 
201 };
202 
203 /* enough for PES header + length */
204 #define PES_START_SIZE 6
205 #define PES_HEADER_SIZE 9
206 #define MAX_PES_HEADER_SIZE (9 + 255)
207 
208 typedef struct PESContext {
209  int pid;
210  int pcr_pid; /**< if -1 then all packets containing PCR are considered */
215  AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
217  /* used to get the format */
219  int flags; /**< copied to the AVPacket flags */
223  int64_t pts, dts;
224  int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
228 } PESContext;
229 
231 
232 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
233 {
234  int i;
235  for (i = 0; i < ts->nb_prg; i++) {
236  if (ts->prg[i].id == programid) {
237  return &ts->prg[i];
238  }
239  }
240  return NULL;
241 }
242 
243 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
244 {
245  AVProgram *prg = NULL;
246  int i;
247 
248  for (i = 0; i < ts->stream->nb_programs; i++)
249  if (ts->stream->programs[i]->id == programid) {
250  prg = ts->stream->programs[i];
251  break;
252  }
253  if (!prg)
254  return;
255  prg->nb_stream_indexes = 0;
256 }
257 
258 static void clear_program(MpegTSContext *ts, unsigned int programid)
259 {
260  int i;
261 
262  clear_avprogram(ts, programid);
263  for (i = 0; i < ts->nb_prg; i++)
264  if (ts->prg[i].id == programid) {
265  ts->prg[i].nb_pids = 0;
266  ts->prg[i].pmt_found = 0;
267  }
268 }
269 
271 {
272  av_freep(&ts->prg);
273  ts->nb_prg = 0;
274 }
275 
276 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
277 {
278  struct Program *p;
279  if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
280  ts->nb_prg = 0;
281  return;
282  }
283  p = &ts->prg[ts->nb_prg];
284  p->id = programid;
285  p->nb_pids = 0;
286  p->pmt_found = 0;
287  ts->nb_prg++;
288 }
289 
290 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
291  unsigned int pid)
292 {
293  struct Program *p = get_program(ts, programid);
294  if (!p)
295  return;
296 
297  if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
298  return;
299  p->pids[p->nb_pids++] = pid;
300 }
301 
302 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
303 {
304  struct Program *p = get_program(ts, programid);
305  if (!p)
306  return;
307 
308  p->pmt_found = 1;
309 }
310 
311 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
312 {
313  int i;
314  for (i = 0; i < s->nb_programs; i++) {
315  if (s->programs[i]->id == programid) {
316  s->programs[i]->pcr_pid = pid;
317  break;
318  }
319  }
320 }
321 
322 /**
323  * @brief discard_pid() decides if the pid is to be discarded according
324  * to caller's programs selection
325  * @param ts : - TS context
326  * @param pid : - pid
327  * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
328  * 0 otherwise
329  */
330 static int discard_pid(MpegTSContext *ts, unsigned int pid)
331 {
332  int i, j, k;
333  int used = 0, discarded = 0;
334  struct Program *p;
335 
336  /* If none of the programs have .discard=AVDISCARD_ALL then there's
337  * no way we have to discard this packet */
338  for (k = 0; k < ts->stream->nb_programs; k++)
339  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
340  break;
341  if (k == ts->stream->nb_programs)
342  return 0;
343 
344  for (i = 0; i < ts->nb_prg; i++) {
345  p = &ts->prg[i];
346  for (j = 0; j < p->nb_pids; j++) {
347  if (p->pids[j] != pid)
348  continue;
349  // is program with id p->id set to be discarded?
350  for (k = 0; k < ts->stream->nb_programs; k++) {
351  if (ts->stream->programs[k]->id == p->id) {
352  if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
353  discarded++;
354  else
355  used++;
356  }
357  }
358  }
359  }
360 
361  return !used && discarded;
362 }
363 
364 /**
365  * Assemble PES packets out of TS packets, and then call the "section_cb"
366  * function when they are complete.
367  */
369  const uint8_t *buf, int buf_size, int is_start)
370 {
371  MpegTSSectionFilter *tss = &tss1->u.section_filter;
372  int len;
373 
374  if (is_start) {
375  memcpy(tss->section_buf, buf, buf_size);
376  tss->section_index = buf_size;
377  tss->section_h_size = -1;
378  tss->end_of_section_reached = 0;
379  } else {
380  if (tss->end_of_section_reached)
381  return;
382  len = 4096 - tss->section_index;
383  if (buf_size < len)
384  len = buf_size;
385  memcpy(tss->section_buf + tss->section_index, buf, len);
386  tss->section_index += len;
387  }
388 
389  /* compute section length if possible */
390  if (tss->section_h_size == -1 && tss->section_index >= 3) {
391  len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
392  if (len > 4096)
393  return;
394  tss->section_h_size = len;
395  }
396 
397  if (tss->section_h_size != -1 &&
398  tss->section_index >= tss->section_h_size) {
399  int crc_valid = 1;
400  tss->end_of_section_reached = 1;
401 
402  if (tss->check_crc) {
403  crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
404  if (crc_valid) {
405  ts->crc_validity[ tss1->pid ] = 100;
406  }else if (ts->crc_validity[ tss1->pid ] > -10) {
407  ts->crc_validity[ tss1->pid ]--;
408  }else
409  crc_valid = 2;
410  }
411  if (crc_valid)
412  tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
413  }
414 }
415 
416 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
417  enum MpegTSFilterType type)
418 {
420 
421  av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
422 
423  if (pid >= NB_PID_MAX || ts->pids[pid])
424  return NULL;
425  filter = av_mallocz(sizeof(MpegTSFilter));
426  if (!filter)
427  return NULL;
428  ts->pids[pid] = filter;
429 
430  filter->type = type;
431  filter->pid = pid;
432  filter->es_id = -1;
433  filter->last_cc = -1;
434  filter->last_pcr= -1;
435 
436  return filter;
437 }
438 
440  unsigned int pid,
441  SectionCallback *section_cb,
442  void *opaque,
443  int check_crc)
444 {
446  MpegTSSectionFilter *sec;
447 
448  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
449  return NULL;
450  sec = &filter->u.section_filter;
451  sec->section_cb = section_cb;
452  sec->opaque = opaque;
454  sec->check_crc = check_crc;
455  if (!sec->section_buf) {
456  av_free(filter);
457  return NULL;
458  }
459  return filter;
460 }
461 
462 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
463  PESCallback *pes_cb,
464  void *opaque)
465 {
467  MpegTSPESFilter *pes;
468 
469  if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
470  return NULL;
471 
472  pes = &filter->u.pes_filter;
473  pes->pes_cb = pes_cb;
474  pes->opaque = opaque;
475  return filter;
476 }
477 
478 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
479 {
480  return mpegts_open_filter(ts, pid, MPEGTS_PCR);
481 }
482 
484 {
485  int pid;
486 
487  pid = filter->pid;
488  if (filter->type == MPEGTS_SECTION)
490  else if (filter->type == MPEGTS_PES) {
491  PESContext *pes = filter->u.pes_filter.opaque;
492  av_buffer_unref(&pes->buffer);
493  /* referenced private data will be freed later in
494  * avformat_close_input */
495  if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
496  av_freep(&filter->u.pes_filter.opaque);
497  }
498  }
499 
500  av_free(filter);
501  ts->pids[pid] = NULL;
502 }
503 
504 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
505 {
506  int stat[TS_MAX_PACKET_SIZE];
507  int i;
508  int best_score = 0;
509 
510  memset(stat, 0, packet_size * sizeof(*stat));
511 
512  for (i = 0; i < size - 3; i++) {
513  if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
514  int x = i % packet_size;
515  stat[x]++;
516  if (stat[x] > best_score) {
517  best_score = stat[x];
518  if (index)
519  *index = x;
520  }
521  }
522  }
523 
524  return best_score;
525 }
526 
527 /* autodetect fec presence. Must have at least 1024 bytes */
528 static int get_packet_size(const uint8_t *buf, int size)
529 {
530  int score, fec_score, dvhs_score;
531 
532  if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
533  return AVERROR_INVALIDDATA;
534 
535  score = analyze(buf, size, TS_PACKET_SIZE, NULL);
536  dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
537  fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
538  av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
539  score, dvhs_score, fec_score);
540 
541  if (score > fec_score && score > dvhs_score)
542  return TS_PACKET_SIZE;
543  else if (dvhs_score > score && dvhs_score > fec_score)
544  return TS_DVHS_PACKET_SIZE;
545  else if (score < fec_score && dvhs_score < fec_score)
546  return TS_FEC_PACKET_SIZE;
547  else
548  return AVERROR_INVALIDDATA;
549 }
550 
551 typedef struct SectionHeader {
553  uint16_t id;
557 } SectionHeader;
558 
559 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
560 {
561  const uint8_t *p;
562  int c;
563 
564  p = *pp;
565  if (p >= p_end)
566  return AVERROR_INVALIDDATA;
567  c = *p++;
568  *pp = p;
569  return c;
570 }
571 
572 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
573 {
574  const uint8_t *p;
575  int c;
576 
577  p = *pp;
578  if ((p + 1) >= p_end)
579  return AVERROR_INVALIDDATA;
580  c = AV_RB16(p);
581  p += 2;
582  *pp = p;
583  return c;
584 }
585 
586 /* read and allocate a DVB string preceded by its length */
587 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
588 {
589  int len;
590  const uint8_t *p;
591  char *str;
592 
593  p = *pp;
594  len = get8(&p, p_end);
595  if (len < 0)
596  return NULL;
597  if ((p + len) > p_end)
598  return NULL;
599  str = av_malloc(len + 1);
600  if (!str)
601  return NULL;
602  memcpy(str, p, len);
603  str[len] = '\0';
604  p += len;
605  *pp = p;
606  return str;
607 }
608 
610  const uint8_t **pp, const uint8_t *p_end)
611 {
612  int val;
613 
614  val = get8(pp, p_end);
615  if (val < 0)
616  return val;
617  h->tid = val;
618  *pp += 2;
619  val = get16(pp, p_end);
620  if (val < 0)
621  return val;
622  h->id = val;
623  val = get8(pp, p_end);
624  if (val < 0)
625  return val;
626  h->version = (val >> 1) & 0x1f;
627  val = get8(pp, p_end);
628  if (val < 0)
629  return val;
630  h->sec_num = val;
631  val = get8(pp, p_end);
632  if (val < 0)
633  return val;
634  h->last_sec_num = val;
635  return 0;
636 }
637 
638 typedef struct {
639  uint32_t stream_type;
642 } StreamType;
643 
644 static const StreamType ISO_types[] = {
651  /* Makito encoder sets stream type 0x11 for AAC,
652  * so auto-detect LOAS/LATM instead of hardcoding it. */
653 #if !CONFIG_LOAS_DEMUXER
654  { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
655 #endif
661  { 0 },
662 };
663 
664 static const StreamType HDMV_types[] = {
670  { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
671  { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
672  { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
673  { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
675  { 0 },
676 };
677 
678 /* ATSC ? */
679 static const StreamType MISC_types[] = {
682  { 0 },
683 };
684 
685 static const StreamType REGD_types[] = {
686  { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
687  { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
688  { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
689  { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
690  { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
691  { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
692  { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
693  { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
694  { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
695  { 0 },
696 };
697 
698 static const StreamType METADATA_types[] = {
699  { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
700  { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
701  { 0 },
702 };
703 
704 /* descriptor present */
705 static const StreamType DESC_types[] = {
706  { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
707  { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
710  { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
711  { 0 },
712 };
713 
715  uint32_t stream_type,
716  const StreamType *types)
717 {
718  if (avcodec_is_open(st->codec)) {
719  av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
720  return;
721  }
722 
723  for (; types->stream_type; types++)
724  if (stream_type == types->stream_type) {
725  st->codec->codec_type = types->codec_type;
726  st->codec->codec_id = types->codec_id;
727  st->request_probe = 0;
728  return;
729  }
730 }
731 
733  uint32_t stream_type, uint32_t prog_reg_desc)
734 {
735  int old_codec_type = st->codec->codec_type;
736  int old_codec_id = st->codec->codec_id;
737 
738  if (avcodec_is_open(st->codec)) {
739  av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
740  return 0;
741  }
742 
743  avpriv_set_pts_info(st, 33, 1, 90000);
744  st->priv_data = pes;
748  pes->st = st;
749  pes->stream_type = stream_type;
750 
751  av_log(pes->stream, AV_LOG_DEBUG,
752  "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
753  st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
754 
755  st->codec->codec_tag = pes->stream_type;
756 
757  mpegts_find_stream_type(st, pes->stream_type, ISO_types);
758  if ((prog_reg_desc == AV_RL32("HDMV") ||
759  prog_reg_desc == AV_RL32("HDPR")) &&
760  st->codec->codec_id == AV_CODEC_ID_NONE) {
761  mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
762  if (pes->stream_type == 0x83) {
763  // HDMV TrueHD streams also contain an AC3 coded version of the
764  // audio track - add a second stream for this
765  AVStream *sub_st;
766  // priv_data cannot be shared between streams
767  PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
768  if (!sub_pes)
769  return AVERROR(ENOMEM);
770  memcpy(sub_pes, pes, sizeof(*sub_pes));
771 
772  sub_st = avformat_new_stream(pes->stream, NULL);
773  if (!sub_st) {
774  av_free(sub_pes);
775  return AVERROR(ENOMEM);
776  }
777 
778  sub_st->id = pes->pid;
779  avpriv_set_pts_info(sub_st, 33, 1, 90000);
780  sub_st->priv_data = sub_pes;
782  sub_st->codec->codec_id = AV_CODEC_ID_AC3;
784  sub_pes->sub_st = pes->sub_st = sub_st;
785  }
786  }
787  if (st->codec->codec_id == AV_CODEC_ID_NONE)
788  mpegts_find_stream_type(st, pes->stream_type, MISC_types);
789  if (st->codec->codec_id == AV_CODEC_ID_NONE) {
790  st->codec->codec_id = old_codec_id;
791  st->codec->codec_type = old_codec_type;
792  }
793 
794  return 0;
795 }
796 
798 {
799  pes->pts = AV_NOPTS_VALUE;
800  pes->dts = AV_NOPTS_VALUE;
801  pes->data_index = 0;
802  pes->flags = 0;
803  av_buffer_unref(&pes->buffer);
804 }
805 
807 {
808  av_init_packet(pkt);
809 
810  pkt->buf = pes->buffer;
811  pkt->data = pes->buffer->data;
812  pkt->size = pes->data_index;
813 
814  if (pes->total_size != MAX_PES_PAYLOAD &&
815  pes->pes_header_size + pes->data_index != pes->total_size +
816  PES_START_SIZE) {
817  av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
818  pes->flags |= AV_PKT_FLAG_CORRUPT;
819  }
820  memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
821 
822  // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
823  if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
824  pkt->stream_index = pes->sub_st->index;
825  else
826  pkt->stream_index = pes->st->index;
827  pkt->pts = pes->pts;
828  pkt->dts = pes->dts;
829  /* store position of first TS packet of this PES packet */
830  pkt->pos = pes->ts_packet_pos;
831  pkt->flags = pes->flags;
832 
833  pes->buffer = NULL;
835 }
836 
837 static uint64_t get_ts64(GetBitContext *gb, int bits)
838 {
839  if (get_bits_left(gb) < bits)
840  return AV_NOPTS_VALUE;
841  return get_bits64(gb, bits);
842 }
843 
845  const uint8_t *buf, int buf_size)
846 {
847  GetBitContext gb;
848  int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
849  int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
850  int dts_flag = -1, cts_flag = -1;
851  int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
852 
853  init_get_bits(&gb, buf, buf_size * 8);
854 
855  if (sl->use_au_start)
856  au_start_flag = get_bits1(&gb);
857  if (sl->use_au_end)
858  au_end_flag = get_bits1(&gb);
859  if (!sl->use_au_start && !sl->use_au_end)
860  au_start_flag = au_end_flag = 1;
861  if (sl->ocr_len > 0)
862  ocr_flag = get_bits1(&gb);
863  if (sl->use_idle)
864  idle_flag = get_bits1(&gb);
865  if (sl->use_padding)
866  padding_flag = get_bits1(&gb);
867  if (padding_flag)
868  padding_bits = get_bits(&gb, 3);
869 
870  if (!idle_flag && (!padding_flag || padding_bits != 0)) {
871  if (sl->packet_seq_num_len)
873  if (sl->degr_prior_len)
874  if (get_bits1(&gb))
875  skip_bits(&gb, sl->degr_prior_len);
876  if (ocr_flag)
877  skip_bits_long(&gb, sl->ocr_len);
878  if (au_start_flag) {
879  if (sl->use_rand_acc_pt)
880  get_bits1(&gb);
881  if (sl->au_seq_num_len > 0)
882  skip_bits_long(&gb, sl->au_seq_num_len);
883  if (sl->use_timestamps) {
884  dts_flag = get_bits1(&gb);
885  cts_flag = get_bits1(&gb);
886  }
887  }
888  if (sl->inst_bitrate_len)
889  inst_bitrate_flag = get_bits1(&gb);
890  if (dts_flag == 1)
891  dts = get_ts64(&gb, sl->timestamp_len);
892  if (cts_flag == 1)
893  cts = get_ts64(&gb, sl->timestamp_len);
894  if (sl->au_len > 0)
895  skip_bits_long(&gb, sl->au_len);
896  if (inst_bitrate_flag)
898  }
899 
900  if (dts != AV_NOPTS_VALUE)
901  pes->dts = dts;
902  if (cts != AV_NOPTS_VALUE)
903  pes->pts = cts;
904 
905  if (sl->timestamp_len && sl->timestamp_res)
907 
908  return (get_bits_count(&gb) + 7) >> 3;
909 }
910 
911 /* return non zero if a packet could be constructed */
913  const uint8_t *buf, int buf_size, int is_start,
914  int64_t pos)
915 {
916  PESContext *pes = filter->u.pes_filter.opaque;
917  MpegTSContext *ts = pes->ts;
918  const uint8_t *p;
919  int len, code;
920 
921  if (!ts->pkt)
922  return 0;
923 
924  if (is_start) {
925  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
926  new_pes_packet(pes, ts->pkt);
927  ts->stop_parse = 1;
928  } else {
930  }
931  pes->state = MPEGTS_HEADER;
932  pes->ts_packet_pos = pos;
933  }
934  p = buf;
935  while (buf_size > 0) {
936  switch (pes->state) {
937  case MPEGTS_HEADER:
938  len = PES_START_SIZE - pes->data_index;
939  if (len > buf_size)
940  len = buf_size;
941  memcpy(pes->header + pes->data_index, p, len);
942  pes->data_index += len;
943  p += len;
944  buf_size -= len;
945  if (pes->data_index == PES_START_SIZE) {
946  /* we got all the PES or section header. We can now
947  * decide */
948  if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
949  pes->header[2] == 0x01) {
950  /* it must be an mpeg2 PES stream */
951  code = pes->header[3] | 0x100;
952  av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
953  code);
954 
955  if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
956  (!pes->sub_st ||
957  pes->sub_st->discard == AVDISCARD_ALL)) ||
958  code == 0x1be) /* padding_stream */
959  goto skip;
960 
961  /* stream not present in PMT */
962  if (!pes->st) {
963  if (ts->skip_changes)
964  goto skip;
965 
966  pes->st = avformat_new_stream(ts->stream, NULL);
967  if (!pes->st)
968  return AVERROR(ENOMEM);
969  pes->st->id = pes->pid;
970  mpegts_set_stream_info(pes->st, pes, 0, 0);
971  }
972 
973  pes->total_size = AV_RB16(pes->header + 4);
974  /* NOTE: a zero total size means the PES size is
975  * unbounded */
976  if (!pes->total_size)
978 
979  /* allocate pes buffer */
980  pes->buffer = av_buffer_alloc(pes->total_size +
982  if (!pes->buffer)
983  return AVERROR(ENOMEM);
984 
985  if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
986  code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
987  code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
988  code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
989  pes->state = MPEGTS_PESHEADER;
990  if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
991  av_dlog(pes->stream,
992  "pid=%x stream_type=%x probing\n",
993  pes->pid,
994  pes->stream_type);
995  pes->st->request_probe = 1;
996  }
997  } else {
998  pes->state = MPEGTS_PAYLOAD;
999  pes->data_index = 0;
1000  }
1001  } else {
1002  /* otherwise, it should be a table */
1003  /* skip packet */
1004 skip:
1005  pes->state = MPEGTS_SKIP;
1006  continue;
1007  }
1008  }
1009  break;
1010  /**********************************************/
1011  /* PES packing parsing */
1012  case MPEGTS_PESHEADER:
1013  len = PES_HEADER_SIZE - pes->data_index;
1014  if (len < 0)
1015  return AVERROR_INVALIDDATA;
1016  if (len > buf_size)
1017  len = buf_size;
1018  memcpy(pes->header + pes->data_index, p, len);
1019  pes->data_index += len;
1020  p += len;
1021  buf_size -= len;
1022  if (pes->data_index == PES_HEADER_SIZE) {
1023  pes->pes_header_size = pes->header[8] + 9;
1025  }
1026  break;
1027  case MPEGTS_PESHEADER_FILL:
1028  len = pes->pes_header_size - pes->data_index;
1029  if (len < 0)
1030  return AVERROR_INVALIDDATA;
1031  if (len > buf_size)
1032  len = buf_size;
1033  memcpy(pes->header + pes->data_index, p, len);
1034  pes->data_index += len;
1035  p += len;
1036  buf_size -= len;
1037  if (pes->data_index == pes->pes_header_size) {
1038  const uint8_t *r;
1039  unsigned int flags, pes_ext, skip;
1040 
1041  flags = pes->header[7];
1042  r = pes->header + 9;
1043  pes->pts = AV_NOPTS_VALUE;
1044  pes->dts = AV_NOPTS_VALUE;
1045  if ((flags & 0xc0) == 0x80) {
1046  pes->dts = pes->pts = ff_parse_pes_pts(r);
1047  r += 5;
1048  } else if ((flags & 0xc0) == 0xc0) {
1049  pes->pts = ff_parse_pes_pts(r);
1050  r += 5;
1051  pes->dts = ff_parse_pes_pts(r);
1052  r += 5;
1053  }
1054  pes->extended_stream_id = -1;
1055  if (flags & 0x01) { /* PES extension */
1056  pes_ext = *r++;
1057  /* Skip PES private data, program packet sequence counter and P-STD buffer */
1058  skip = (pes_ext >> 4) & 0xb;
1059  skip += skip & 0x9;
1060  r += skip;
1061  if ((pes_ext & 0x41) == 0x01 &&
1062  (r + 2) <= (pes->header + pes->pes_header_size)) {
1063  /* PES extension 2 */
1064  if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1065  pes->extended_stream_id = r[1];
1066  }
1067  }
1068 
1069  /* we got the full header. We parse it and get the payload */
1070  pes->state = MPEGTS_PAYLOAD;
1071  pes->data_index = 0;
1072  if (pes->stream_type == 0x12 && buf_size > 0) {
1073  int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1074  buf_size);
1075  pes->pes_header_size += sl_header_bytes;
1076  p += sl_header_bytes;
1077  buf_size -= sl_header_bytes;
1078  }
1079  if (pes->stream_type == 0x15 && buf_size >= 5) {
1080  /* skip metadata access unit header */
1081  pes->pes_header_size += 5;
1082  p += 5;
1083  buf_size -= 5;
1084  }
1085  if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1086  AVProgram *p = NULL;
1087  while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1088  if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1089  MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1090  if (f) {
1091  AVStream *st = NULL;
1092  if (f->type == MPEGTS_PES) {
1093  PESContext *pcrpes = f->u.pes_filter.opaque;
1094  if (pcrpes)
1095  st = pcrpes->st;
1096  } else if (f->type == MPEGTS_PCR) {
1097  int i;
1098  for (i = 0; i < p->nb_stream_indexes; i++) {
1099  AVStream *pst = pes->stream->streams[p->stream_index[i]];
1100  if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1101  st = pst;
1102  }
1103  }
1104  if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1105  // teletext packets do not always have correct timestamps,
1106  // the standard says they should be handled after 40.6 ms at most,
1107  // and the pcr error to this packet should be no more than 100 ms.
1108  // TODO: we should interpolate the PCR, not just use the last one
1109  int64_t pcr = f->last_pcr / 300;
1112  if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1113  pes->pts = pes->dts = pcr;
1114  } else if (pes->dts > pcr + 3654 + 9000) {
1115  pes->pts = pes->dts = pcr + 3654 + 9000;
1116  }
1117  break;
1118  }
1119  }
1120  }
1121  }
1122  }
1123  }
1124  break;
1125  case MPEGTS_PAYLOAD:
1126  if (pes->buffer) {
1127  if (pes->data_index > 0 &&
1128  pes->data_index + buf_size > pes->total_size) {
1129  new_pes_packet(pes, ts->pkt);
1130  pes->total_size = MAX_PES_PAYLOAD;
1131  pes->buffer = av_buffer_alloc(pes->total_size +
1133  if (!pes->buffer)
1134  return AVERROR(ENOMEM);
1135  ts->stop_parse = 1;
1136  } else if (pes->data_index == 0 &&
1137  buf_size > pes->total_size) {
1138  // pes packet size is < ts size packet and pes data is padded with 0xff
1139  // not sure if this is legal in ts but see issue #2392
1140  buf_size = pes->total_size;
1141  }
1142  memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1143  pes->data_index += buf_size;
1144  /* emit complete packets with known packet size
1145  * decreases demuxer delay for infrequent packets like subtitles from
1146  * a couple of seconds to milliseconds for properly muxed files.
1147  * total_size is the number of bytes following pes_packet_length
1148  * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1149  if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1150  pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1151  ts->stop_parse = 1;
1152  new_pes_packet(pes, ts->pkt);
1153  }
1154  }
1155  buf_size = 0;
1156  break;
1157  case MPEGTS_SKIP:
1158  buf_size = 0;
1159  break;
1160  }
1161  }
1162 
1163  return 0;
1164 }
1165 
1166 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1167 {
1168  MpegTSFilter *tss;
1169  PESContext *pes;
1170 
1171  /* if no pid found, then add a pid context */
1172  pes = av_mallocz(sizeof(PESContext));
1173  if (!pes)
1174  return 0;
1175  pes->ts = ts;
1176  pes->stream = ts->stream;
1177  pes->pid = pid;
1178  pes->pcr_pid = pcr_pid;
1179  pes->state = MPEGTS_SKIP;
1180  pes->pts = AV_NOPTS_VALUE;
1181  pes->dts = AV_NOPTS_VALUE;
1182  tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1183  if (!tss) {
1184  av_free(pes);
1185  return 0;
1186  }
1187  return pes;
1188 }
1189 
1190 #define MAX_LEVEL 4
1191 typedef struct {
1198  int level;
1201 
1203  const uint8_t *buf, unsigned size,
1204  Mp4Descr *descr, int max_descr_count)
1205 {
1206  int ret;
1207  if (size > (1 << 30))
1208  return AVERROR_INVALIDDATA;
1209 
1210  if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1211  NULL, NULL, NULL, NULL)) < 0)
1212  return ret;
1213 
1214  d->s = s;
1215  d->level = 0;
1216  d->descr_count = 0;
1217  d->descr = descr;
1218  d->active_descr = NULL;
1219  d->max_descr_count = max_descr_count;
1220 
1221  return 0;
1222 }
1223 
1224 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1225 {
1226  int64_t new_off = avio_tell(pb);
1227  (*len) -= new_off - *off;
1228  *off = new_off;
1229 }
1230 
1231 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1232  int target_tag);
1233 
1234 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1235 {
1236  while (len > 0) {
1237  int ret = parse_mp4_descr(d, off, len, 0);
1238  if (ret < 0)
1239  return ret;
1240  update_offsets(&d->pb, &off, &len);
1241  }
1242  return 0;
1243 }
1244 
1245 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1246 {
1247  avio_rb16(&d->pb); // ID
1248  avio_r8(&d->pb);
1249  avio_r8(&d->pb);
1250  avio_r8(&d->pb);
1251  avio_r8(&d->pb);
1252  avio_r8(&d->pb);
1253  update_offsets(&d->pb, &off, &len);
1254  return parse_mp4_descr_arr(d, off, len);
1255 }
1256 
1257 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1258 {
1259  int id_flags;
1260  if (len < 2)
1261  return 0;
1262  id_flags = avio_rb16(&d->pb);
1263  if (!(id_flags & 0x0020)) { // URL_Flag
1264  update_offsets(&d->pb, &off, &len);
1265  return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1266  } else {
1267  return 0;
1268  }
1269 }
1270 
1271 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1272 {
1273  int es_id = 0;
1274  if (d->descr_count >= d->max_descr_count)
1275  return AVERROR_INVALIDDATA;
1276  ff_mp4_parse_es_descr(&d->pb, &es_id);
1277  d->active_descr = d->descr + (d->descr_count++);
1278 
1279  d->active_descr->es_id = es_id;
1280  update_offsets(&d->pb, &off, &len);
1281  parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1282  update_offsets(&d->pb, &off, &len);
1283  if (len > 0)
1284  parse_mp4_descr(d, off, len, MP4SLDescrTag);
1285  d->active_descr = NULL;
1286  return 0;
1287 }
1288 
1290  int len)
1291 {
1292  Mp4Descr *descr = d->active_descr;
1293  if (!descr)
1294  return AVERROR_INVALIDDATA;
1296  if (!descr->dec_config_descr)
1297  return AVERROR(ENOMEM);
1298  descr->dec_config_descr_len = len;
1299  avio_read(&d->pb, descr->dec_config_descr, len);
1300  return 0;
1301 }
1302 
1303 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1304 {
1305  Mp4Descr *descr = d->active_descr;
1306  int predefined;
1307  if (!descr)
1308  return AVERROR_INVALIDDATA;
1309 
1310  predefined = avio_r8(&d->pb);
1311  if (!predefined) {
1312  int lengths;
1313  int flags = avio_r8(&d->pb);
1314  descr->sl.use_au_start = !!(flags & 0x80);
1315  descr->sl.use_au_end = !!(flags & 0x40);
1316  descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1317  descr->sl.use_padding = !!(flags & 0x08);
1318  descr->sl.use_timestamps = !!(flags & 0x04);
1319  descr->sl.use_idle = !!(flags & 0x02);
1320  descr->sl.timestamp_res = avio_rb32(&d->pb);
1321  avio_rb32(&d->pb);
1322  descr->sl.timestamp_len = avio_r8(&d->pb);
1323  if (descr->sl.timestamp_len > 64) {
1324  avpriv_request_sample(NULL, "timestamp_len > 64");
1325  descr->sl.timestamp_len = 64;
1326  return AVERROR_PATCHWELCOME;
1327  }
1328  descr->sl.ocr_len = avio_r8(&d->pb);
1329  descr->sl.au_len = avio_r8(&d->pb);
1330  descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1331  lengths = avio_rb16(&d->pb);
1332  descr->sl.degr_prior_len = lengths >> 12;
1333  descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1334  descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1335  } else if (!d->predefined_SLConfigDescriptor_seen){
1336  avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1338  }
1339  return 0;
1340 }
1341 
1342 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1343  int target_tag)
1344 {
1345  int tag;
1346  int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1347  update_offsets(&d->pb, &off, &len);
1348  if (len < 0 || len1 > len || len1 <= 0) {
1349  av_log(d->s, AV_LOG_ERROR,
1350  "Tag %x length violation new length %d bytes remaining %d\n",
1351  tag, len1, len);
1352  return AVERROR_INVALIDDATA;
1353  }
1354 
1355  if (d->level++ >= MAX_LEVEL) {
1356  av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1357  goto done;
1358  }
1359 
1360  if (target_tag && tag != target_tag) {
1361  av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1362  target_tag);
1363  goto done;
1364  }
1365 
1366  switch (tag) {
1367  case MP4IODescrTag:
1368  parse_MP4IODescrTag(d, off, len1);
1369  break;
1370  case MP4ODescrTag:
1371  parse_MP4ODescrTag(d, off, len1);
1372  break;
1373  case MP4ESDescrTag:
1374  parse_MP4ESDescrTag(d, off, len1);
1375  break;
1376  case MP4DecConfigDescrTag:
1377  parse_MP4DecConfigDescrTag(d, off, len1);
1378  break;
1379  case MP4SLDescrTag:
1380  parse_MP4SLDescrTag(d, off, len1);
1381  break;
1382  }
1383 
1384 
1385 done:
1386  d->level--;
1387  avio_seek(&d->pb, off + len1, SEEK_SET);
1388  return 0;
1389 }
1390 
1391 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1392  Mp4Descr *descr, int *descr_count, int max_descr_count)
1393 {
1395  int ret;
1396 
1397  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1398  if (ret < 0)
1399  return ret;
1400 
1401  ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1402 
1403  *descr_count = d.descr_count;
1404  return ret;
1405 }
1406 
1407 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1408  Mp4Descr *descr, int *descr_count, int max_descr_count)
1409 {
1411  int ret;
1412 
1413  ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1414  if (ret < 0)
1415  return ret;
1416 
1417  ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1418 
1419  *descr_count = d.descr_count;
1420  return ret;
1421 }
1422 
1424  int section_len)
1425 {
1426  MpegTSContext *ts = filter->u.section_filter.opaque;
1427  SectionHeader h;
1428  const uint8_t *p, *p_end;
1429  AVIOContext pb;
1430  int mp4_descr_count = 0;
1431  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1432  int i, pid;
1433  AVFormatContext *s = ts->stream;
1434 
1435  p_end = section + section_len - 4;
1436  p = section;
1437  if (parse_section_header(&h, &p, p_end) < 0)
1438  return;
1439  if (h.tid != M4OD_TID)
1440  return;
1441 
1442  mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1444 
1445  for (pid = 0; pid < NB_PID_MAX; pid++) {
1446  if (!ts->pids[pid])
1447  continue;
1448  for (i = 0; i < mp4_descr_count; i++) {
1449  PESContext *pes;
1450  AVStream *st;
1451  if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1452  continue;
1453  if (ts->pids[pid]->type != MPEGTS_PES) {
1454  av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1455  continue;
1456  }
1457  pes = ts->pids[pid]->u.pes_filter.opaque;
1458  st = pes->st;
1459  if (!st)
1460  continue;
1461 
1462  pes->sl = mp4_descr[i].sl;
1463 
1464  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1465  mp4_descr[i].dec_config_descr_len, 0,
1466  NULL, NULL, NULL, NULL);
1467  ff_mp4_read_dec_config_descr(s, st, &pb);
1468  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1469  st->codec->extradata_size > 0)
1470  st->need_parsing = 0;
1471  if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1472  st->codec->extradata_size > 0)
1473  st->need_parsing = 0;
1474 
1475  if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1476  // do nothing
1477  } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1479  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1481  else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1483  }
1484  }
1485  for (i = 0; i < mp4_descr_count; i++)
1486  av_free(mp4_descr[i].dec_config_descr);
1487 }
1488 
1490  const uint8_t **pp, const uint8_t *desc_list_end,
1491  Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1492  MpegTSContext *ts)
1493 {
1494  const uint8_t *desc_end;
1495  int desc_len, desc_tag, desc_es_id;
1496  char language[252];
1497  int i;
1498 
1499  desc_tag = get8(pp, desc_list_end);
1500  if (desc_tag < 0)
1501  return AVERROR_INVALIDDATA;
1502  desc_len = get8(pp, desc_list_end);
1503  if (desc_len < 0)
1504  return AVERROR_INVALIDDATA;
1505  desc_end = *pp + desc_len;
1506  if (desc_end > desc_list_end)
1507  return AVERROR_INVALIDDATA;
1508 
1509  av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1510 
1511  if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1512  stream_type == STREAM_TYPE_PRIVATE_DATA)
1513  mpegts_find_stream_type(st, desc_tag, DESC_types);
1514 
1515  switch (desc_tag) {
1516  case 0x1E: /* SL descriptor */
1517  desc_es_id = get16(pp, desc_end);
1518  if (ts && ts->pids[pid])
1519  ts->pids[pid]->es_id = desc_es_id;
1520  for (i = 0; i < mp4_descr_count; i++)
1521  if (mp4_descr[i].dec_config_descr_len &&
1522  mp4_descr[i].es_id == desc_es_id) {
1523  AVIOContext pb;
1524  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1525  mp4_descr[i].dec_config_descr_len, 0,
1526  NULL, NULL, NULL, NULL);
1527  ff_mp4_read_dec_config_descr(fc, st, &pb);
1528  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1529  st->codec->extradata_size > 0)
1530  st->need_parsing = 0;
1532  mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1533  }
1534  break;
1535  case 0x1F: /* FMC descriptor */
1536  get16(pp, desc_end);
1537  if (mp4_descr_count > 0 &&
1538  (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1539  mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1540  AVIOContext pb;
1541  ffio_init_context(&pb, mp4_descr->dec_config_descr,
1542  mp4_descr->dec_config_descr_len, 0,
1543  NULL, NULL, NULL, NULL);
1544  ff_mp4_read_dec_config_descr(fc, st, &pb);
1545  if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1546  st->codec->extradata_size > 0) {
1547  st->request_probe = st->need_parsing = 0;
1549  }
1550  }
1551  break;
1552  case 0x56: /* DVB teletext descriptor */
1553  {
1554  uint8_t *extradata = NULL;
1555  int language_count = desc_len / 5;
1556 
1557  if (desc_len > 0 && desc_len % 5 != 0)
1558  return AVERROR_INVALIDDATA;
1559 
1560  if (language_count > 0) {
1561  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1562  if (language_count > sizeof(language) / 4) {
1563  language_count = sizeof(language) / 4;
1564  }
1565 
1566  if (st->codec->extradata == NULL) {
1567  if (ff_alloc_extradata(st->codec, language_count * 2)) {
1568  return AVERROR(ENOMEM);
1569  }
1570  }
1571 
1572  if (st->codec->extradata_size < language_count * 2)
1573  return AVERROR_INVALIDDATA;
1574 
1575  extradata = st->codec->extradata;
1576 
1577  for (i = 0; i < language_count; i++) {
1578  language[i * 4 + 0] = get8(pp, desc_end);
1579  language[i * 4 + 1] = get8(pp, desc_end);
1580  language[i * 4 + 2] = get8(pp, desc_end);
1581  language[i * 4 + 3] = ',';
1582 
1583  memcpy(extradata, *pp, 2);
1584  extradata += 2;
1585 
1586  *pp += 2;
1587  }
1588 
1589  language[i * 4 - 1] = 0;
1590  av_dict_set(&st->metadata, "language", language, 0);
1591  }
1592  }
1593  break;
1594  case 0x59: /* subtitling descriptor */
1595  {
1596  /* 8 bytes per DVB subtitle substream data:
1597  * ISO_639_language_code (3 bytes),
1598  * subtitling_type (1 byte),
1599  * composition_page_id (2 bytes),
1600  * ancillary_page_id (2 bytes) */
1601  int language_count = desc_len / 8;
1602 
1603  if (desc_len > 0 && desc_len % 8 != 0)
1604  return AVERROR_INVALIDDATA;
1605 
1606  if (language_count > 1) {
1607  avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1608  }
1609 
1610  if (language_count > 0) {
1611  uint8_t *extradata;
1612 
1613  /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1614  if (language_count > sizeof(language) / 4) {
1615  language_count = sizeof(language) / 4;
1616  }
1617 
1618  if (st->codec->extradata == NULL) {
1619  if (ff_alloc_extradata(st->codec, language_count * 5)) {
1620  return AVERROR(ENOMEM);
1621  }
1622  }
1623 
1624  if (st->codec->extradata_size < language_count * 5)
1625  return AVERROR_INVALIDDATA;
1626 
1627  extradata = st->codec->extradata;
1628 
1629  for (i = 0; i < language_count; i++) {
1630  language[i * 4 + 0] = get8(pp, desc_end);
1631  language[i * 4 + 1] = get8(pp, desc_end);
1632  language[i * 4 + 2] = get8(pp, desc_end);
1633  language[i * 4 + 3] = ',';
1634 
1635  /* hearing impaired subtitles detection using subtitling_type */
1636  switch (*pp[0]) {
1637  case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1638  case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1639  case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1640  case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1641  case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1642  case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1644  break;
1645  }
1646 
1647  extradata[4] = get8(pp, desc_end); /* subtitling_type */
1648  memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1649  extradata += 5;
1650 
1651  *pp += 4;
1652  }
1653 
1654  language[i * 4 - 1] = 0;
1655  av_dict_set(&st->metadata, "language", language, 0);
1656  }
1657  }
1658  break;
1659  case 0x0a: /* ISO 639 language descriptor */
1660  for (i = 0; i + 4 <= desc_len; i += 4) {
1661  language[i + 0] = get8(pp, desc_end);
1662  language[i + 1] = get8(pp, desc_end);
1663  language[i + 2] = get8(pp, desc_end);
1664  language[i + 3] = ',';
1665  switch (get8(pp, desc_end)) {
1666  case 0x01:
1668  break;
1669  case 0x02:
1671  break;
1672  case 0x03:
1674  break;
1675  }
1676  }
1677  if (i && language[0]) {
1678  language[i - 1] = 0;
1679  av_dict_set(&st->metadata, "language", language, 0);
1680  }
1681  break;
1682  case 0x05: /* registration descriptor */
1683  st->codec->codec_tag = bytestream_get_le32(pp);
1684  av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1685  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1686  mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1687  break;
1688  case 0x52: /* stream identifier descriptor */
1689  st->stream_identifier = 1 + get8(pp, desc_end);
1690  break;
1691  case 0x26: /* metadata descriptor */
1692  if (get16(pp, desc_end) == 0xFFFF)
1693  *pp += 4;
1694  if (get8(pp, desc_end) == 0xFF) {
1695  st->codec->codec_tag = bytestream_get_le32(pp);
1696  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1697  mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1698  }
1699  break;
1700  default:
1701  break;
1702  }
1703  *pp = desc_end;
1704  return 0;
1705 }
1706 
1707 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1708 {
1709  MpegTSContext *ts = filter->u.section_filter.opaque;
1710  SectionHeader h1, *h = &h1;
1711  PESContext *pes;
1712  AVStream *st;
1713  const uint8_t *p, *p_end, *desc_list_end;
1714  int program_info_length, pcr_pid, pid, stream_type;
1715  int desc_list_len;
1716  uint32_t prog_reg_desc = 0; /* registration descriptor */
1717 
1718  int mp4_descr_count = 0;
1719  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1720  int i;
1721 
1722  av_dlog(ts->stream, "PMT: len %i\n", section_len);
1723  hex_dump_debug(ts->stream, section, section_len);
1724 
1725  p_end = section + section_len - 4;
1726  p = section;
1727  if (parse_section_header(h, &p, p_end) < 0)
1728  return;
1729 
1730  av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1731  h->id, h->sec_num, h->last_sec_num);
1732 
1733  if (h->tid != PMT_TID)
1734  return;
1735  if (ts->skip_changes)
1736  return;
1737 
1738  clear_program(ts, h->id);
1739  pcr_pid = get16(&p, p_end);
1740  if (pcr_pid < 0)
1741  return;
1742  pcr_pid &= 0x1fff;
1743  add_pid_to_pmt(ts, h->id, pcr_pid);
1744  set_pcr_pid(ts->stream, h->id, pcr_pid);
1745 
1746  av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1747 
1748  program_info_length = get16(&p, p_end);
1749  if (program_info_length < 0)
1750  return;
1751  program_info_length &= 0xfff;
1752  while (program_info_length >= 2) {
1753  uint8_t tag, len;
1754  tag = get8(&p, p_end);
1755  len = get8(&p, p_end);
1756 
1757  av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1758 
1759  if (len > program_info_length - 2)
1760  // something else is broken, exit the program_descriptors_loop
1761  break;
1762  program_info_length -= len + 2;
1763  if (tag == 0x1d) { // IOD descriptor
1764  get8(&p, p_end); // scope
1765  get8(&p, p_end); // label
1766  len -= 2;
1767  mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1768  &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1769  } else if (tag == 0x05 && len >= 4) { // registration descriptor
1770  prog_reg_desc = bytestream_get_le32(&p);
1771  len -= 4;
1772  }
1773  p += len;
1774  }
1775  p += program_info_length;
1776  if (p >= p_end)
1777  goto out;
1778 
1779  // stop parsing after pmt, we found header
1780  if (!ts->stream->nb_streams)
1781  ts->stop_parse = 2;
1782 
1783  set_pmt_found(ts, h->id);
1784 
1785 
1786  for (;;) {
1787  st = 0;
1788  pes = NULL;
1789  stream_type = get8(&p, p_end);
1790  if (stream_type < 0)
1791  break;
1792  pid = get16(&p, p_end);
1793  if (pid < 0)
1794  goto out;
1795  pid &= 0x1fff;
1796  if (pid == ts->current_pid)
1797  goto out;
1798 
1799  /* now create stream */
1800  if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1801  pes = ts->pids[pid]->u.pes_filter.opaque;
1802  if (!pes->st) {
1803  pes->st = avformat_new_stream(pes->stream, NULL);
1804  if (!pes->st)
1805  goto out;
1806  pes->st->id = pes->pid;
1807  }
1808  st = pes->st;
1809  } else if (stream_type != 0x13) {
1810  if (ts->pids[pid])
1811  mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1812  pes = add_pes_stream(ts, pid, pcr_pid);
1813  if (pes) {
1814  st = avformat_new_stream(pes->stream, NULL);
1815  if (!st)
1816  goto out;
1817  st->id = pes->pid;
1818  }
1819  } else {
1820  int idx = ff_find_stream_index(ts->stream, pid);
1821  if (idx >= 0) {
1822  st = ts->stream->streams[idx];
1823  } else {
1824  st = avformat_new_stream(ts->stream, NULL);
1825  if (!st)
1826  goto out;
1827  st->id = pid;
1829  }
1830  }
1831 
1832  if (!st)
1833  goto out;
1834 
1835  if (pes && !pes->stream_type)
1836  mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1837 
1838  add_pid_to_pmt(ts, h->id, pid);
1839 
1841 
1842  desc_list_len = get16(&p, p_end);
1843  if (desc_list_len < 0)
1844  goto out;
1845  desc_list_len &= 0xfff;
1846  desc_list_end = p + desc_list_len;
1847  if (desc_list_end > p_end)
1848  goto out;
1849  for (;;) {
1850  if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1851  desc_list_end, mp4_descr,
1852  mp4_descr_count, pid, ts) < 0)
1853  break;
1854 
1855  if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1856  stream_type == 0x83 && pes->sub_st) {
1858  pes->sub_st->index);
1859  pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1860  }
1861  }
1862  p = desc_list_end;
1863  }
1864 
1865  if (!ts->pids[pcr_pid])
1866  mpegts_open_pcr_filter(ts, pcr_pid);
1867 
1868 out:
1869  for (i = 0; i < mp4_descr_count; i++)
1870  av_free(mp4_descr[i].dec_config_descr);
1871 }
1872 
1873 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1874 {
1875  MpegTSContext *ts = filter->u.section_filter.opaque;
1876  SectionHeader h1, *h = &h1;
1877  const uint8_t *p, *p_end;
1878  int sid, pmt_pid;
1879  AVProgram *program;
1880 
1881  av_dlog(ts->stream, "PAT:\n");
1882  hex_dump_debug(ts->stream, section, section_len);
1883 
1884  p_end = section + section_len - 4;
1885  p = section;
1886  if (parse_section_header(h, &p, p_end) < 0)
1887  return;
1888  if (h->tid != PAT_TID)
1889  return;
1890  if (ts->skip_changes)
1891  return;
1892 
1893  ts->stream->ts_id = h->id;
1894 
1895  clear_programs(ts);
1896  for (;;) {
1897  sid = get16(&p, p_end);
1898  if (sid < 0)
1899  break;
1900  pmt_pid = get16(&p, p_end);
1901  if (pmt_pid < 0)
1902  break;
1903  pmt_pid &= 0x1fff;
1904 
1905  if (pmt_pid == ts->current_pid)
1906  break;
1907 
1908  av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1909 
1910  if (sid == 0x0000) {
1911  /* NIT info */
1912  } else {
1913  MpegTSFilter *fil = ts->pids[pmt_pid];
1914  program = av_new_program(ts->stream, sid);
1915  program->program_num = sid;
1916  program->pmt_pid = pmt_pid;
1917  if (fil)
1918  if ( fil->type != MPEGTS_SECTION
1919  || fil->pid != pmt_pid
1920  || fil->u.section_filter.section_cb != pmt_cb)
1921  mpegts_close_filter(ts, ts->pids[pmt_pid]);
1922 
1923  if (!ts->pids[pmt_pid])
1924  mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1925  add_pat_entry(ts, sid);
1926  add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1927  add_pid_to_pmt(ts, sid, pmt_pid);
1928  }
1929  }
1930 
1931  if (sid < 0) {
1932  int i,j;
1933  for (j=0; j<ts->stream->nb_programs; j++) {
1934  for (i = 0; i < ts->nb_prg; i++)
1935  if (ts->prg[i].id == ts->stream->programs[j]->id)
1936  break;
1937  if (i==ts->nb_prg && !ts->skip_clear)
1938  clear_avprogram(ts, ts->stream->programs[j]->id);
1939  }
1940  }
1941 }
1942 
1943 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1944 {
1945  MpegTSContext *ts = filter->u.section_filter.opaque;
1946  SectionHeader h1, *h = &h1;
1947  const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1948  int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1949  char *name, *provider_name;
1950 
1951  av_dlog(ts->stream, "SDT:\n");
1952  hex_dump_debug(ts->stream, section, section_len);
1953 
1954  p_end = section + section_len - 4;
1955  p = section;
1956  if (parse_section_header(h, &p, p_end) < 0)
1957  return;
1958  if (h->tid != SDT_TID)
1959  return;
1960  if (ts->skip_changes)
1961  return;
1962  onid = get16(&p, p_end);
1963  if (onid < 0)
1964  return;
1965  val = get8(&p, p_end);
1966  if (val < 0)
1967  return;
1968  for (;;) {
1969  sid = get16(&p, p_end);
1970  if (sid < 0)
1971  break;
1972  val = get8(&p, p_end);
1973  if (val < 0)
1974  break;
1975  desc_list_len = get16(&p, p_end);
1976  if (desc_list_len < 0)
1977  break;
1978  desc_list_len &= 0xfff;
1979  desc_list_end = p + desc_list_len;
1980  if (desc_list_end > p_end)
1981  break;
1982  for (;;) {
1983  desc_tag = get8(&p, desc_list_end);
1984  if (desc_tag < 0)
1985  break;
1986  desc_len = get8(&p, desc_list_end);
1987  desc_end = p + desc_len;
1988  if (desc_end > desc_list_end)
1989  break;
1990 
1991  av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1992  desc_tag, desc_len);
1993 
1994  switch (desc_tag) {
1995  case 0x48:
1996  service_type = get8(&p, p_end);
1997  if (service_type < 0)
1998  break;
1999  provider_name = getstr8(&p, p_end);
2000  if (!provider_name)
2001  break;
2002  name = getstr8(&p, p_end);
2003  if (name) {
2004  AVProgram *program = av_new_program(ts->stream, sid);
2005  if (program) {
2006  av_dict_set(&program->metadata, "service_name", name, 0);
2007  av_dict_set(&program->metadata, "service_provider",
2008  provider_name, 0);
2009  }
2010  }
2011  av_free(name);
2012  av_free(provider_name);
2013  break;
2014  default:
2015  break;
2016  }
2017  p = desc_end;
2018  }
2019  p = desc_list_end;
2020  }
2021 }
2022 
2023 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2024  const uint8_t *packet);
2025 
2026 /* handle one TS packet */
2027 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2028 {
2029  MpegTSFilter *tss;
2030  int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2031  has_adaptation, has_payload;
2032  const uint8_t *p, *p_end;
2033  int64_t pos;
2034 
2035  pid = AV_RB16(packet + 1) & 0x1fff;
2036  if (pid && discard_pid(ts, pid))
2037  return 0;
2038  is_start = packet[1] & 0x40;
2039  tss = ts->pids[pid];
2040  if (ts->auto_guess && tss == NULL && is_start) {
2041  add_pes_stream(ts, pid, -1);
2042  tss = ts->pids[pid];
2043  }
2044  if (!tss)
2045  return 0;
2046  ts->current_pid = pid;
2047 
2048  afc = (packet[3] >> 4) & 3;
2049  if (afc == 0) /* reserved value */
2050  return 0;
2051  has_adaptation = afc & 2;
2052  has_payload = afc & 1;
2053  is_discontinuity = has_adaptation &&
2054  packet[4] != 0 && /* with length > 0 */
2055  (packet[5] & 0x80); /* and discontinuity indicated */
2056 
2057  /* continuity check (currently not used) */
2058  cc = (packet[3] & 0xf);
2059  expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2060  cc_ok = pid == 0x1FFF || // null packet PID
2061  is_discontinuity ||
2062  tss->last_cc < 0 ||
2063  expected_cc == cc;
2064 
2065  tss->last_cc = cc;
2066  if (!cc_ok) {
2067  av_log(ts->stream, AV_LOG_DEBUG,
2068  "Continuity check failed for pid %d expected %d got %d\n",
2069  pid, expected_cc, cc);
2070  if (tss->type == MPEGTS_PES) {
2071  PESContext *pc = tss->u.pes_filter.opaque;
2072  pc->flags |= AV_PKT_FLAG_CORRUPT;
2073  }
2074  }
2075 
2076  if (!has_payload && tss->type != MPEGTS_PCR)
2077  return 0;
2078  p = packet + 4;
2079  if (has_adaptation) {
2080  /* skip adaptation field */
2081  p += p[0] + 1;
2082  }
2083  /* if past the end of packet, ignore */
2084  p_end = packet + TS_PACKET_SIZE;
2085  if (p > p_end || (p == p_end && tss->type != MPEGTS_PCR))
2086  return 0;
2087 
2088  pos = avio_tell(ts->stream->pb);
2089  if (pos >= 0) {
2090  av_assert0(pos >= TS_PACKET_SIZE);
2091  ts->pos47_full = pos - TS_PACKET_SIZE;
2092  }
2093 
2094  if (tss->type == MPEGTS_SECTION) {
2095  if (is_start) {
2096  /* pointer field present */
2097  len = *p++;
2098  if (p + len > p_end)
2099  return 0;
2100  if (len && cc_ok) {
2101  /* write remaining section bytes */
2102  write_section_data(ts, tss,
2103  p, len, 0);
2104  /* check whether filter has been closed */
2105  if (!ts->pids[pid])
2106  return 0;
2107  }
2108  p += len;
2109  if (p < p_end) {
2110  write_section_data(ts, tss,
2111  p, p_end - p, 1);
2112  }
2113  } else {
2114  if (cc_ok) {
2115  write_section_data(ts, tss,
2116  p, p_end - p, 0);
2117  }
2118  }
2119 
2120  // stop find_stream_info from waiting for more streams
2121  // when all programs have received a PMT
2122  if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2123  int i;
2124  for (i = 0; i < ts->nb_prg; i++) {
2125  if (!ts->prg[i].pmt_found)
2126  break;
2127  }
2128  if (i == ts->nb_prg && ts->nb_prg > 0) {
2129  if (ts->stream->nb_streams > 1 || pos > 100000) {
2130  av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2132  }
2133  }
2134  }
2135 
2136  } else {
2137  int ret;
2138  int64_t pcr_h;
2139  int pcr_l;
2140  if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2141  tss->last_pcr = pcr_h * 300 + pcr_l;
2142  // Note: The position here points actually behind the current packet.
2143  if (tss->type == MPEGTS_PES) {
2144  if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2145  pos - ts->raw_packet_size)) < 0)
2146  return ret;
2147  }
2148  }
2149 
2150  return 0;
2151 }
2152 
2153 static void reanalyze(MpegTSContext *ts) {
2154  AVIOContext *pb = ts->stream->pb;
2155  int64_t pos = avio_tell(pb);
2156  if (pos < 0)
2157  return;
2158  pos -= ts->pos47_full;
2159  if (pos == TS_PACKET_SIZE) {
2160  ts->size_stat[0] ++;
2161  } else if (pos == TS_DVHS_PACKET_SIZE) {
2162  ts->size_stat[1] ++;
2163  } else if (pos == TS_FEC_PACKET_SIZE) {
2164  ts->size_stat[2] ++;
2165  }
2166 
2167  ts->size_stat_count ++;
2169  int newsize = 0;
2170  if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2171  newsize = TS_PACKET_SIZE;
2172  } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2173  newsize = TS_DVHS_PACKET_SIZE;
2174  } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2175  newsize = TS_FEC_PACKET_SIZE;
2176  }
2177  if (newsize && newsize != ts->raw_packet_size) {
2178  av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2179  ts->raw_packet_size = newsize;
2180  }
2181  ts->size_stat_count = 0;
2182  memset(ts->size_stat, 0, sizeof(ts->size_stat));
2183  }
2184 }
2185 
2186 /* XXX: try to find a better synchro over several packets (use
2187  * get_packet_size() ?) */
2189 {
2190  AVIOContext *pb = s->pb;
2191  int c, i;
2192 
2193  for (i = 0; i < MAX_RESYNC_SIZE; i++) {
2194  c = avio_r8(pb);
2195  if (url_feof(pb))
2196  return AVERROR_EOF;
2197  if (c == 0x47) {
2198  avio_seek(pb, -1, SEEK_CUR);
2199  reanalyze(s->priv_data);
2200  return 0;
2201  }
2202  }
2203  av_log(s, AV_LOG_ERROR,
2204  "max resync size reached, could not find sync byte\n");
2205  /* no sync found */
2206  return AVERROR_INVALIDDATA;
2207 }
2208 
2209 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2210 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2211  const uint8_t **data)
2212 {
2213  AVIOContext *pb = s->pb;
2214  int len;
2215 
2216  for (;;) {
2217  len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2218  if (len != TS_PACKET_SIZE)
2219  return len < 0 ? len : AVERROR_EOF;
2220  /* check packet sync byte */
2221  if ((*data)[0] != 0x47) {
2222  /* find a new packet start */
2223  uint64_t pos = avio_tell(pb);
2224  avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2225 
2226  if (mpegts_resync(s) < 0)
2227  return AVERROR(EAGAIN);
2228  else
2229  continue;
2230  } else {
2231  break;
2232  }
2233  }
2234  return 0;
2235 }
2236 
2237 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2238 {
2239  AVIOContext *pb = s->pb;
2240  int skip = raw_packet_size - TS_PACKET_SIZE;
2241  if (skip > 0)
2242  avio_skip(pb, skip);
2243 }
2244 
2245 static int handle_packets(MpegTSContext *ts, int nb_packets)
2246 {
2247  AVFormatContext *s = ts->stream;
2249  const uint8_t *data;
2250  int packet_num, ret = 0;
2251 
2252  if (avio_tell(s->pb) != ts->last_pos) {
2253  int i;
2254  av_dlog(ts->stream, "Skipping after seek\n");
2255  /* seek detected, flush pes buffer */
2256  for (i = 0; i < NB_PID_MAX; i++) {
2257  if (ts->pids[i]) {
2258  if (ts->pids[i]->type == MPEGTS_PES) {
2259  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2260  av_buffer_unref(&pes->buffer);
2261  pes->data_index = 0;
2262  pes->state = MPEGTS_SKIP; /* skip until pes header */
2263  }
2264  ts->pids[i]->last_cc = -1;
2265  ts->pids[i]->last_pcr = -1;
2266  }
2267  }
2268  }
2269 
2270  ts->stop_parse = 0;
2271  packet_num = 0;
2272  memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2273  for (;;) {
2274  packet_num++;
2275  if (nb_packets != 0 && packet_num >= nb_packets ||
2276  ts->stop_parse > 1) {
2277  ret = AVERROR(EAGAIN);
2278  break;
2279  }
2280  if (ts->stop_parse > 0)
2281  break;
2282 
2283  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2284  if (ret != 0)
2285  break;
2286  ret = handle_packet(ts, data);
2288  if (ret != 0)
2289  break;
2290  }
2291  ts->last_pos = avio_tell(s->pb);
2292  return ret;
2293 }
2294 
2296 {
2297  const int size = p->buf_size;
2298  int maxscore = 0;
2299  int sumscore = 0;
2300  int i;
2301  int check_count = size / TS_FEC_PACKET_SIZE;
2302 #define CHECK_COUNT 10
2303 #define CHECK_BLOCK 100
2304 
2305  if (check_count < CHECK_COUNT)
2306  return AVERROR_INVALIDDATA;
2307 
2308  for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2309  int left = FFMIN(check_count - i, CHECK_BLOCK);
2310  int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2311  int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2312  int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2313  score = FFMAX3(score, dvhs_score, fec_score);
2314  sumscore += score;
2315  maxscore = FFMAX(maxscore, score);
2316  }
2317 
2318  sumscore = sumscore * CHECK_COUNT / check_count;
2319  maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2320 
2321  av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2322 
2323  if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2324  else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2325  else
2326  return AVERROR_INVALIDDATA;
2327 }
2328 
2329 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2330  * (-1) if not available */
2331 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2332 {
2333  int afc, len, flags;
2334  const uint8_t *p;
2335  unsigned int v;
2336 
2337  afc = (packet[3] >> 4) & 3;
2338  if (afc <= 1)
2339  return AVERROR_INVALIDDATA;
2340  p = packet + 4;
2341  len = p[0];
2342  p++;
2343  if (len == 0)
2344  return AVERROR_INVALIDDATA;
2345  flags = *p++;
2346  len--;
2347  if (!(flags & 0x10))
2348  return AVERROR_INVALIDDATA;
2349  if (len < 6)
2350  return AVERROR_INVALIDDATA;
2351  v = AV_RB32(p);
2352  *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2353  *ppcr_low = ((p[4] & 1) << 8) | p[5];
2354  return 0;
2355 }
2356 
2357 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2358 
2359  /* NOTE: We attempt to seek on non-seekable files as well, as the
2360  * probe buffer usually is big enough. Only warn if the seek failed
2361  * on files where the seek should work. */
2362  if (avio_seek(pb, pos, SEEK_SET) < 0)
2363  av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2364 }
2365 
2367 {
2368  MpegTSContext *ts = s->priv_data;
2369  AVIOContext *pb = s->pb;
2370  uint8_t buf[8 * 1024] = {0};
2371  int len;
2372  int64_t pos;
2373 
2375 
2376  /* read the first 8192 bytes to get packet size */
2377  pos = avio_tell(pb);
2378  len = avio_read(pb, buf, sizeof(buf));
2379  ts->raw_packet_size = get_packet_size(buf, len);
2380  if (ts->raw_packet_size <= 0) {
2381  av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2383  }
2384  ts->stream = s;
2385  ts->auto_guess = 0;
2386 
2387  if (s->iformat == &ff_mpegts_demuxer) {
2388  /* normal demux */
2389 
2390  /* first do a scan to get all the services */
2391  seek_back(s, pb, pos);
2392 
2394 
2396 
2398  /* if could not find service, enable auto_guess */
2399 
2400  ts->auto_guess = 1;
2401 
2402  av_dlog(ts->stream, "tuning done\n");
2403 
2405  } else {
2406  AVStream *st;
2407  int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2408  int64_t pcrs[2], pcr_h;
2409  int packet_count[2];
2410  uint8_t packet[TS_PACKET_SIZE];
2411  const uint8_t *data;
2412 
2413  /* only read packets */
2414 
2415  st = avformat_new_stream(s, NULL);
2416  if (!st)
2417  return AVERROR(ENOMEM);
2418  avpriv_set_pts_info(st, 60, 1, 27000000);
2421 
2422  /* we iterate until we find two PCRs to estimate the bitrate */
2423  pcr_pid = -1;
2424  nb_pcrs = 0;
2425  nb_packets = 0;
2426  for (;;) {
2427  ret = read_packet(s, packet, ts->raw_packet_size, &data);
2428  if (ret < 0)
2429  return ret;
2430  pid = AV_RB16(data + 1) & 0x1fff;
2431  if ((pcr_pid == -1 || pcr_pid == pid) &&
2432  parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2434  pcr_pid = pid;
2435  packet_count[nb_pcrs] = nb_packets;
2436  pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2437  nb_pcrs++;
2438  if (nb_pcrs >= 2)
2439  break;
2440  } else {
2442  }
2443  nb_packets++;
2444  }
2445 
2446  /* NOTE1: the bitrate is computed without the FEC */
2447  /* NOTE2: it is only the bitrate of the start of the stream */
2448  ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2449  ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2450  s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2451  st->codec->bit_rate = s->bit_rate;
2452  st->start_time = ts->cur_pcr;
2453  av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2454  st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2455  }
2456 
2457  seek_back(s, pb, pos);
2458  return 0;
2459 }
2460 
2461 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2462 
2464 {
2465  MpegTSContext *ts = s->priv_data;
2466  int ret, i;
2467  int64_t pcr_h, next_pcr_h, pos;
2468  int pcr_l, next_pcr_l;
2469  uint8_t pcr_buf[12];
2470  const uint8_t *data;
2471 
2472  if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2473  return AVERROR(ENOMEM);
2474  ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2475  pkt->pos = avio_tell(s->pb);
2476  if (ret < 0) {
2477  av_free_packet(pkt);
2478  return ret;
2479  }
2480  if (data != pkt->data)
2481  memcpy(pkt->data, data, ts->raw_packet_size);
2483  if (ts->mpeg2ts_compute_pcr) {
2484  /* compute exact PCR for each packet */
2485  if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2486  /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2487  pos = avio_tell(s->pb);
2488  for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2489  avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2490  avio_read(s->pb, pcr_buf, 12);
2491  if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2492  /* XXX: not precise enough */
2493  ts->pcr_incr =
2494  ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2495  (i + 1);
2496  break;
2497  }
2498  }
2499  avio_seek(s->pb, pos, SEEK_SET);
2500  /* no next PCR found: we use previous increment */
2501  ts->cur_pcr = pcr_h * 300 + pcr_l;
2502  }
2503  pkt->pts = ts->cur_pcr;
2504  pkt->duration = ts->pcr_incr;
2505  ts->cur_pcr += ts->pcr_incr;
2506  }
2507  pkt->stream_index = 0;
2508  return 0;
2509 }
2510 
2512 {
2513  MpegTSContext *ts = s->priv_data;
2514  int ret, i;
2515 
2516  pkt->size = -1;
2517  ts->pkt = pkt;
2518  ret = handle_packets(ts, 0);
2519  if (ret < 0) {
2520  av_free_packet(ts->pkt);
2521  /* flush pes data left */
2522  for (i = 0; i < NB_PID_MAX; i++)
2523  if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2524  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2525  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2526  new_pes_packet(pes, pkt);
2527  pes->state = MPEGTS_SKIP;
2528  ret = 0;
2529  break;
2530  }
2531  }
2532  }
2533 
2534  if (!ret && pkt->size < 0)
2535  ret = AVERROR(EINTR);
2536  return ret;
2537 }
2538 
2539 static void mpegts_free(MpegTSContext *ts)
2540 {
2541  int i;
2542 
2543  clear_programs(ts);
2544 
2545  for (i = 0; i < NB_PID_MAX; i++)
2546  if (ts->pids[i])
2547  mpegts_close_filter(ts, ts->pids[i]);
2548 }
2549 
2551 {
2552  MpegTSContext *ts = s->priv_data;
2553  mpegts_free(ts);
2554  return 0;
2555 }
2556 
2557 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2558  int64_t *ppos, int64_t pos_limit)
2559 {
2560  MpegTSContext *ts = s->priv_data;
2561  int64_t pos, timestamp;
2563  int pcr_l, pcr_pid =
2564  ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2565  int pos47 = ts->pos47_full % ts->raw_packet_size;
2566  pos =
2567  ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2568  ts->raw_packet_size + pos47;
2569  while(pos < pos_limit) {
2570  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2571  return AV_NOPTS_VALUE;
2572  if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2573  return AV_NOPTS_VALUE;
2574  if (buf[0] != 0x47) {
2575  avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2576  if (mpegts_resync(s) < 0)
2577  return AV_NOPTS_VALUE;
2578  pos = avio_tell(s->pb);
2579  continue;
2580  }
2581  if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2582  parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2583  *ppos = pos;
2584  return timestamp;
2585  }
2586  pos += ts->raw_packet_size;
2587  }
2588 
2589  return AV_NOPTS_VALUE;
2590 }
2591 
2592 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2593  int64_t *ppos, int64_t pos_limit)
2594 {
2595  MpegTSContext *ts = s->priv_data;
2596  int64_t pos;
2597  int pos47 = ts->pos47_full % ts->raw_packet_size;
2598  pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2600  if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2601  return AV_NOPTS_VALUE;
2602  while(pos < pos_limit) {
2603  int ret;
2604  AVPacket pkt;
2605  av_init_packet(&pkt);
2606  ret = av_read_frame(s, &pkt);
2607  if (ret < 0)
2608  return AV_NOPTS_VALUE;
2609  av_free_packet(&pkt);
2610  if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2611  ff_reduce_index(s, pkt.stream_index);
2612  av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2613  if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2614  *ppos = pkt.pos;
2615  return pkt.dts;
2616  }
2617  }
2618  pos = pkt.pos;
2619  }
2620 
2621  return AV_NOPTS_VALUE;
2622 }
2623 
2624 /**************************************************************/
2625 /* parsing functions - called from other demuxers such as RTP */
2626 
2628 {
2629  MpegTSContext *ts;
2630 
2631  ts = av_mallocz(sizeof(MpegTSContext));
2632  if (!ts)
2633  return NULL;
2634  /* no stream case, currently used by RTP */
2636  ts->stream = s;
2637  ts->auto_guess = 1;
2640 
2641  return ts;
2642 }
2643 
2644 /* return the consumed length if a packet was output, or -1 if no
2645  * packet is output */
2647  const uint8_t *buf, int len)
2648 {
2649  int len1;
2650 
2651  len1 = len;
2652  ts->pkt = pkt;
2653  for (;;) {
2654  ts->stop_parse = 0;
2655  if (len < TS_PACKET_SIZE)
2656  return AVERROR_INVALIDDATA;
2657  if (buf[0] != 0x47) {
2658  buf++;
2659  len--;
2660  } else {
2661  handle_packet(ts, buf);
2662  buf += TS_PACKET_SIZE;
2663  len -= TS_PACKET_SIZE;
2664  if (ts->stop_parse == 1)
2665  break;
2666  }
2667  }
2668  return len1 - len;
2669 }
2670 
2672 {
2673  mpegts_free(ts);
2674  av_free(ts);
2675 }
2676 
2677 AVInputFormat ff_mpegts_demuxer = {
2678  .name = "mpegts",
2679  .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2680  .priv_data_size = sizeof(MpegTSContext),
2685  .read_timestamp = mpegts_get_dts,
2687  .priv_class = &mpegts_class,
2688 };
2689 
2691  .name = "mpegtsraw",
2692  .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2693  .priv_data_size = sizeof(MpegTSContext),
2697  .read_timestamp = mpegts_get_dts,
2699  .priv_class = &mpegtsraw_class,
2700 };