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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 //#define USE_SYNCPOINT_SEARCH
23 
24 #include "libavutil/crc.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/mathematics.h"
29 #include "libavutil/opt.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 
51 };
52 
53 typedef struct MpegTSFilter MpegTSFilter;
54 
55 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
56 
57 typedef struct MpegTSPESFilter {
59  void *opaque;
61 
62 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
63 
64 typedef void SetServiceCallback(void *opaque, int ret);
65 
66 typedef struct MpegTSSectionFilter {
69  uint8_t *section_buf;
70  unsigned int check_crc:1;
71  unsigned int end_of_section_reached:1;
73  void *opaque;
75 
76 struct MpegTSFilter {
77  int pid;
78  int es_id;
79  int last_cc; /* last cc code (-1 if first packet) */
81  union {
84  } u;
85 };
86 
87 #define MAX_PIDS_PER_PROGRAM 64
88 struct Program {
89  unsigned int id; //program id/service id
90  unsigned int nb_pids;
91  unsigned int pids[MAX_PIDS_PER_PROGRAM];
92 };
93 
94 struct MpegTSContext {
95  const AVClass *class;
96  /* user data */
100 
101  int pos47;
102 
105 
108 
109  int64_t cur_pcr;
110  int pcr_incr;
112  /* data needed to handle file based ts */
118  int64_t last_pos;
119 
120  /******************************************/
121  /* private mpegts data */
122  /* scan context */
124  unsigned int nb_prg;
125  struct Program *prg;
126 
127 
130 };
131 
132 static const AVOption options[] = {
133  {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
134  {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
135  { NULL },
136 };
137 
138 static const AVClass mpegtsraw_class = {
139  .class_name = "mpegtsraw demuxer",
140  .item_name = av_default_item_name,
141  .option = options,
142  .version = LIBAVUTIL_VERSION_INT,
143 };
144 
145 /* TS stream handling */
146 
153 };
154 
155 /* enough for PES header + length */
156 #define PES_START_SIZE 6
157 #define PES_HEADER_SIZE 9
158 #define MAX_PES_HEADER_SIZE (9 + 255)
159 
160 typedef struct PESContext {
161  int pid;
162  int pcr_pid;
169  /* used to get the format */
171  int flags;
175  int64_t pts, dts;
176  int64_t ts_packet_pos;
178  uint8_t *buffer;
180 } PESContext;
181 
183 
184 static void clear_program(MpegTSContext *ts, unsigned int programid)
185 {
186  int i;
187 
188  for(i=0; i<ts->nb_prg; i++)
189  if(ts->prg[i].id == programid)
190  ts->prg[i].nb_pids = 0;
191 }
192 
194 {
195  av_freep(&ts->prg);
196  ts->nb_prg=0;
197 }
198 
199 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
200 {
201  struct Program *p;
202  void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
203  if(!tmp)
204  return;
205  ts->prg = tmp;
206  p = &ts->prg[ts->nb_prg];
207  p->id = programid;
208  p->nb_pids = 0;
209  ts->nb_prg++;
210 }
211 
212 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
213 {
214  int i;
215  struct Program *p = NULL;
216  for(i=0; i<ts->nb_prg; i++) {
217  if(ts->prg[i].id == programid) {
218  p = &ts->prg[i];
219  break;
220  }
221  }
222  if(!p)
223  return;
224 
225  if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
226  return;
227  p->pids[p->nb_pids++] = pid;
228 }
229 
238 static int discard_pid(MpegTSContext *ts, unsigned int pid)
239 {
240  int i, j, k;
241  int used = 0, discarded = 0;
242  struct Program *p;
243  for(i=0; i<ts->nb_prg; i++) {
244  p = &ts->prg[i];
245  for(j=0; j<p->nb_pids; j++) {
246  if(p->pids[j] != pid)
247  continue;
248  //is program with id p->id set to be discarded?
249  for(k=0; k<ts->stream->nb_programs; k++) {
250  if(ts->stream->programs[k]->id == p->id) {
251  if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
252  discarded++;
253  else
254  used++;
255  }
256  }
257  }
258  }
259 
260  return !used && discarded;
261 }
262 
268  const uint8_t *buf, int buf_size, int is_start)
269 {
270  MpegTSSectionFilter *tss = &tss1->u.section_filter;
271  int len;
272 
273  if (is_start) {
274  memcpy(tss->section_buf, buf, buf_size);
275  tss->section_index = buf_size;
276  tss->section_h_size = -1;
277  tss->end_of_section_reached = 0;
278  } else {
279  if (tss->end_of_section_reached)
280  return;
281  len = 4096 - tss->section_index;
282  if (buf_size < len)
283  len = buf_size;
284  memcpy(tss->section_buf + tss->section_index, buf, len);
285  tss->section_index += len;
286  }
287 
288  /* compute section length if possible */
289  if (tss->section_h_size == -1 && tss->section_index >= 3) {
290  len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
291  if (len > 4096)
292  return;
293  tss->section_h_size = len;
294  }
295 
296  if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
297  tss->end_of_section_reached = 1;
298  if (!tss->check_crc ||
300  tss->section_buf, tss->section_h_size) == 0)
301  tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
302  }
303 }
304 
306  SectionCallback *section_cb, void *opaque,
307  int check_crc)
308 
309 {
311  MpegTSSectionFilter *sec;
312 
313  av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
314 
315  if (pid >= NB_PID_MAX || ts->pids[pid])
316  return NULL;
317  filter = av_mallocz(sizeof(MpegTSFilter));
318  if (!filter)
319  return NULL;
320  ts->pids[pid] = filter;
321  filter->type = MPEGTS_SECTION;
322  filter->pid = pid;
323  filter->es_id = -1;
324  filter->last_cc = -1;
325  sec = &filter->u.section_filter;
326  sec->section_cb = section_cb;
327  sec->opaque = opaque;
329  sec->check_crc = check_crc;
330  if (!sec->section_buf) {
331  av_free(filter);
332  return NULL;
333  }
334  return filter;
335 }
336 
337 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
338  PESCallback *pes_cb,
339  void *opaque)
340 {
342  MpegTSPESFilter *pes;
343 
344  if (pid >= NB_PID_MAX || ts->pids[pid])
345  return NULL;
346  filter = av_mallocz(sizeof(MpegTSFilter));
347  if (!filter)
348  return NULL;
349  ts->pids[pid] = filter;
350  filter->type = MPEGTS_PES;
351  filter->pid = pid;
352  filter->es_id = -1;
353  filter->last_cc = -1;
354  pes = &filter->u.pes_filter;
355  pes->pes_cb = pes_cb;
356  pes->opaque = opaque;
357  return filter;
358 }
359 
361 {
362  int pid;
363 
364  pid = filter->pid;
365  if (filter->type == MPEGTS_SECTION)
367  else if (filter->type == MPEGTS_PES) {
368  PESContext *pes = filter->u.pes_filter.opaque;
369  av_freep(&pes->buffer);
370  /* referenced private data will be freed later in
371  * avformat_close_input */
372  if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
373  av_freep(&filter->u.pes_filter.opaque);
374  }
375  }
376 
377  av_free(filter);
378  ts->pids[pid] = NULL;
379 }
380 
381 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
382  int stat[TS_MAX_PACKET_SIZE];
383  int i;
384  int x=0;
385  int best_score=0;
386 
387  memset(stat, 0, packet_size*sizeof(int));
388 
389  for(x=i=0; i<size-3; i++){
390  if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
391  stat[x]++;
392  if(stat[x] > best_score){
393  best_score= stat[x];
394  if(index) *index= x;
395  }
396  }
397 
398  x++;
399  if(x == packet_size) x= 0;
400  }
401 
402  return best_score;
403 }
404 
405 /* autodetect fec presence. Must have at least 1024 bytes */
406 static int get_packet_size(const uint8_t *buf, int size)
407 {
408  int score, fec_score, dvhs_score;
409 
410  if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
411  return -1;
412 
413  score = analyze(buf, size, TS_PACKET_SIZE, NULL);
414  dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
415  fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
416 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
417 
418  if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
419  else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
420  else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
421  else return -1;
422 }
423 
424 typedef struct SectionHeader {
425  uint8_t tid;
426  uint16_t id;
427  uint8_t version;
428  uint8_t sec_num;
429  uint8_t last_sec_num;
430 } SectionHeader;
431 
432 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
433 {
434  const uint8_t *p;
435  int c;
436 
437  p = *pp;
438  if (p >= p_end)
439  return -1;
440  c = *p++;
441  *pp = p;
442  return c;
443 }
444 
445 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
446 {
447  const uint8_t *p;
448  int c;
449 
450  p = *pp;
451  if ((p + 1) >= p_end)
452  return -1;
453  c = AV_RB16(p);
454  p += 2;
455  *pp = p;
456  return c;
457 }
458 
459 /* read and allocate a DVB string preceded by its length */
460 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
461 {
462  int len;
463  const uint8_t *p;
464  char *str;
465 
466  p = *pp;
467  len = get8(&p, p_end);
468  if (len < 0)
469  return NULL;
470  if ((p + len) > p_end)
471  return NULL;
472  str = av_malloc(len + 1);
473  if (!str)
474  return NULL;
475  memcpy(str, p, len);
476  str[len] = '\0';
477  p += len;
478  *pp = p;
479  return str;
480 }
481 
483  const uint8_t **pp, const uint8_t *p_end)
484 {
485  int val;
486 
487  val = get8(pp, p_end);
488  if (val < 0)
489  return -1;
490  h->tid = val;
491  *pp += 2;
492  val = get16(pp, p_end);
493  if (val < 0)
494  return -1;
495  h->id = val;
496  val = get8(pp, p_end);
497  if (val < 0)
498  return -1;
499  h->version = (val >> 1) & 0x1f;
500  val = get8(pp, p_end);
501  if (val < 0)
502  return -1;
503  h->sec_num = val;
504  val = get8(pp, p_end);
505  if (val < 0)
506  return -1;
507  h->last_sec_num = val;
508  return 0;
509 }
510 
511 typedef struct {
512  uint32_t stream_type;
515 } StreamType;
516 
517 static const StreamType ISO_types[] = {
520  { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
521  { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
522  { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
524  { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
527  { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
528  { 0 },
529 };
530 
531 static const StreamType HDMV_types[] = {
533  { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
534  { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
538  { 0 },
539 };
540 
541 /* ATSC ? */
542 static const StreamType MISC_types[] = {
543  { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
544  { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
545  { 0 },
546 };
547 
548 static const StreamType REGD_types[] = {
549  { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
550  { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
551  { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
552  { 0 },
553 };
554 
555 /* descriptor present */
556 static const StreamType DESC_types[] = {
557  { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
558  { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
559  { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
561  { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
562  { 0 },
563 };
564 
566  uint32_t stream_type, const StreamType *types)
567 {
568  for (; types->stream_type; types++) {
569  if (stream_type == types->stream_type) {
570  st->codec->codec_type = types->codec_type;
571  st->codec->codec_id = types->codec_id;
572  return;
573  }
574  }
575 }
576 
578  uint32_t stream_type, uint32_t prog_reg_desc)
579 {
580  avpriv_set_pts_info(st, 33, 1, 90000);
581  st->priv_data = pes;
585  pes->st = st;
586  pes->stream_type = stream_type;
587 
588  av_log(pes->stream, AV_LOG_DEBUG,
589  "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
590  st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
591 
592  st->codec->codec_tag = pes->stream_type;
593 
594  mpegts_find_stream_type(st, pes->stream_type, ISO_types);
595  if (prog_reg_desc == AV_RL32("HDMV") &&
596  st->codec->codec_id == CODEC_ID_NONE) {
597  mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
598  if (pes->stream_type == 0x83) {
599  // HDMV TrueHD streams also contain an AC3 coded version of the
600  // audio track - add a second stream for this
601  AVStream *sub_st;
602  // priv_data cannot be shared between streams
603  PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
604  if (!sub_pes)
605  return AVERROR(ENOMEM);
606  memcpy(sub_pes, pes, sizeof(*sub_pes));
607 
608  sub_st = avformat_new_stream(pes->stream, NULL);
609  if (!sub_st) {
610  av_free(sub_pes);
611  return AVERROR(ENOMEM);
612  }
613 
614  sub_st->id = pes->pid;
615  avpriv_set_pts_info(sub_st, 33, 1, 90000);
616  sub_st->priv_data = sub_pes;
618  sub_st->codec->codec_id = CODEC_ID_AC3;
620  sub_pes->sub_st = pes->sub_st = sub_st;
621  }
622  }
623  if (st->codec->codec_id == CODEC_ID_NONE)
624  mpegts_find_stream_type(st, pes->stream_type, MISC_types);
625 
626  return 0;
627 }
628 
629 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
630 {
631  av_init_packet(pkt);
632 
634  pkt->data = pes->buffer;
635  pkt->size = pes->data_index;
636 
637  if(pes->total_size != MAX_PES_PAYLOAD &&
638  pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
639  av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
640  pes->flags |= AV_PKT_FLAG_CORRUPT;
641  }
642  memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
643 
644  // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
645  if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
646  pkt->stream_index = pes->sub_st->index;
647  else
648  pkt->stream_index = pes->st->index;
649  pkt->pts = pes->pts;
650  pkt->dts = pes->dts;
651  /* store position of first TS packet of this PES packet */
652  pkt->pos = pes->ts_packet_pos;
653  pkt->flags = pes->flags;
654 
655  /* reset pts values */
656  pes->pts = AV_NOPTS_VALUE;
657  pes->dts = AV_NOPTS_VALUE;
658  pes->buffer = NULL;
659  pes->data_index = 0;
660  pes->flags = 0;
661 }
662 
663 static uint64_t get_bits64(GetBitContext *gb, int bits)
664 {
665  uint64_t ret = 0;
666  while (bits > 17) {
667  ret <<= 17;
668  ret |= get_bits(gb, 17);
669  bits -= 17;
670  }
671  ret <<= bits;
672  ret |= get_bits(gb, bits);
673  return ret;
674 }
675 
676 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
677 {
678  GetBitContext gb;
679  int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
680  int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
681  int dts_flag = -1, cts_flag = -1;
682  int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
683  init_get_bits(&gb, buf, buf_size*8);
684 
685  if (sl->use_au_start)
686  au_start_flag = get_bits1(&gb);
687  if (sl->use_au_end)
688  au_end_flag = get_bits1(&gb);
689  if (!sl->use_au_start && !sl->use_au_end)
690  au_start_flag = au_end_flag = 1;
691  if (sl->ocr_len > 0)
692  ocr_flag = get_bits1(&gb);
693  if (sl->use_idle)
694  idle_flag = get_bits1(&gb);
695  if (sl->use_padding)
696  padding_flag = get_bits1(&gb);
697  if (padding_flag)
698  padding_bits = get_bits(&gb, 3);
699 
700  if (!idle_flag && (!padding_flag || padding_bits != 0)) {
701  if (sl->packet_seq_num_len)
703  if (sl->degr_prior_len)
704  if (get_bits1(&gb))
705  skip_bits(&gb, sl->degr_prior_len);
706  if (ocr_flag)
707  skip_bits_long(&gb, sl->ocr_len);
708  if (au_start_flag) {
709  if (sl->use_rand_acc_pt)
710  get_bits1(&gb);
711  if (sl->au_seq_num_len > 0)
712  skip_bits_long(&gb, sl->au_seq_num_len);
713  if (sl->use_timestamps) {
714  dts_flag = get_bits1(&gb);
715  cts_flag = get_bits1(&gb);
716  }
717  }
718  if (sl->inst_bitrate_len)
719  inst_bitrate_flag = get_bits1(&gb);
720  if (dts_flag == 1)
721  dts = get_bits64(&gb, sl->timestamp_len);
722  if (cts_flag == 1)
723  cts = get_bits64(&gb, sl->timestamp_len);
724  if (sl->au_len > 0)
725  skip_bits_long(&gb, sl->au_len);
726  if (inst_bitrate_flag)
728  }
729 
730  if (dts != AV_NOPTS_VALUE)
731  pes->dts = dts;
732  if (cts != AV_NOPTS_VALUE)
733  pes->pts = cts;
734 
735  if (sl->timestamp_len && sl->timestamp_res)
737 
738  return (get_bits_count(&gb) + 7) >> 3;
739 }
740 
741 /* return non zero if a packet could be constructed */
743  const uint8_t *buf, int buf_size, int is_start,
744  int64_t pos)
745 {
746  PESContext *pes = filter->u.pes_filter.opaque;
747  MpegTSContext *ts = pes->ts;
748  const uint8_t *p;
749  int len, code;
750 
751  if(!ts->pkt)
752  return 0;
753 
754  if (is_start) {
755  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
756  new_pes_packet(pes, ts->pkt);
757  ts->stop_parse = 1;
758  }
759  pes->state = MPEGTS_HEADER;
760  pes->data_index = 0;
761  pes->ts_packet_pos = pos;
762  }
763  p = buf;
764  while (buf_size > 0) {
765  switch(pes->state) {
766  case MPEGTS_HEADER:
767  len = PES_START_SIZE - pes->data_index;
768  if (len > buf_size)
769  len = buf_size;
770  memcpy(pes->header + pes->data_index, p, len);
771  pes->data_index += len;
772  p += len;
773  buf_size -= len;
774  if (pes->data_index == PES_START_SIZE) {
775  /* we got all the PES or section header. We can now
776  decide */
777  if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
778  pes->header[2] == 0x01) {
779  /* it must be an mpeg2 PES stream */
780  code = pes->header[3] | 0x100;
781  av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
782 
783  if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
784  code == 0x1be) /* padding_stream */
785  goto skip;
786 
787  /* stream not present in PMT */
788  if (!pes->st) {
789  pes->st = avformat_new_stream(ts->stream, NULL);
790  if (!pes->st)
791  return AVERROR(ENOMEM);
792  pes->st->id = pes->pid;
793  mpegts_set_stream_info(pes->st, pes, 0, 0);
794  }
795 
796  pes->total_size = AV_RB16(pes->header + 4);
797  /* NOTE: a zero total size means the PES size is
798  unbounded */
799  if (!pes->total_size)
801 
802  /* allocate pes buffer */
804  if (!pes->buffer)
805  return AVERROR(ENOMEM);
806 
807  if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
808  code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
809  code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
810  code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
811  pes->state = MPEGTS_PESHEADER;
812  if (pes->st->codec->codec_id == CODEC_ID_NONE) {
813  av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
814  pes->pid, pes->stream_type);
815  pes->st->codec->codec_id = CODEC_ID_PROBE;
816  }
817  } else {
818  pes->state = MPEGTS_PAYLOAD;
819  pes->data_index = 0;
820  }
821  } else {
822  /* otherwise, it should be a table */
823  /* skip packet */
824  skip:
825  pes->state = MPEGTS_SKIP;
826  continue;
827  }
828  }
829  break;
830  /**********************************************/
831  /* PES packing parsing */
832  case MPEGTS_PESHEADER:
833  len = PES_HEADER_SIZE - pes->data_index;
834  if (len < 0)
835  return -1;
836  if (len > buf_size)
837  len = buf_size;
838  memcpy(pes->header + pes->data_index, p, len);
839  pes->data_index += len;
840  p += len;
841  buf_size -= len;
842  if (pes->data_index == PES_HEADER_SIZE) {
843  pes->pes_header_size = pes->header[8] + 9;
845  }
846  break;
848  len = pes->pes_header_size - pes->data_index;
849  if (len < 0)
850  return -1;
851  if (len > buf_size)
852  len = buf_size;
853  memcpy(pes->header + pes->data_index, p, len);
854  pes->data_index += len;
855  p += len;
856  buf_size -= len;
857  if (pes->data_index == pes->pes_header_size) {
858  const uint8_t *r;
859  unsigned int flags, pes_ext, skip;
860 
861  flags = pes->header[7];
862  r = pes->header + 9;
863  pes->pts = AV_NOPTS_VALUE;
864  pes->dts = AV_NOPTS_VALUE;
865  if ((flags & 0xc0) == 0x80) {
866  pes->dts = pes->pts = ff_parse_pes_pts(r);
867  r += 5;
868  } else if ((flags & 0xc0) == 0xc0) {
869  pes->pts = ff_parse_pes_pts(r);
870  r += 5;
871  pes->dts = ff_parse_pes_pts(r);
872  r += 5;
873  }
874  pes->extended_stream_id = -1;
875  if (flags & 0x01) { /* PES extension */
876  pes_ext = *r++;
877  /* Skip PES private data, program packet sequence counter and P-STD buffer */
878  skip = (pes_ext >> 4) & 0xb;
879  skip += skip & 0x9;
880  r += skip;
881  if ((pes_ext & 0x41) == 0x01 &&
882  (r + 2) <= (pes->header + pes->pes_header_size)) {
883  /* PES extension 2 */
884  if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
885  pes->extended_stream_id = r[1];
886  }
887  }
888 
889  /* we got the full header. We parse it and get the payload */
890  pes->state = MPEGTS_PAYLOAD;
891  pes->data_index = 0;
892  if (pes->stream_type == 0x12 && buf_size > 0) {
893  int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
894  pes->pes_header_size += sl_header_bytes;
895  p += sl_header_bytes;
896  buf_size -= sl_header_bytes;
897  }
898  }
899  break;
900  case MPEGTS_PAYLOAD:
901  if (buf_size > 0 && pes->buffer) {
902  if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
903  new_pes_packet(pes, ts->pkt);
906  if (!pes->buffer)
907  return AVERROR(ENOMEM);
908  ts->stop_parse = 1;
909  } else if (pes->data_index == 0 && buf_size > pes->total_size) {
910  // pes packet size is < ts size packet and pes data is padded with 0xff
911  // not sure if this is legal in ts but see issue #2392
912  buf_size = pes->total_size;
913  }
914  memcpy(pes->buffer+pes->data_index, p, buf_size);
915  pes->data_index += buf_size;
916  }
917  buf_size = 0;
918  /* emit complete packets with known packet size
919  * decreases demuxer delay for infrequent packets like subtitles from
920  * a couple of seconds to milliseconds for properly muxed files.
921  * total_size is the number of bytes following pes_packet_length
922  * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
923  if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
924  pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
925  ts->stop_parse = 1;
926  new_pes_packet(pes, ts->pkt);
927  }
928  break;
929  case MPEGTS_SKIP:
930  buf_size = 0;
931  break;
932  }
933  }
934 
935  return 0;
936 }
937 
938 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
939 {
940  MpegTSFilter *tss;
941  PESContext *pes;
942 
943  /* if no pid found, then add a pid context */
944  pes = av_mallocz(sizeof(PESContext));
945  if (!pes)
946  return 0;
947  pes->ts = ts;
948  pes->stream = ts->stream;
949  pes->pid = pid;
950  pes->pcr_pid = pcr_pid;
951  pes->state = MPEGTS_SKIP;
952  pes->pts = AV_NOPTS_VALUE;
953  pes->dts = AV_NOPTS_VALUE;
954  tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
955  if (!tss) {
956  av_free(pes);
957  return 0;
958  }
959  return pes;
960 }
961 
962 #define MAX_LEVEL 4
963 typedef struct {
970  int level;
972 
974  MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
975  unsigned size, Mp4Descr *descr, int max_descr_count)
976 {
977  int ret;
978  if (size > (1<<30))
979  return AVERROR_INVALIDDATA;
980 
981  if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
982  NULL, NULL, NULL, NULL)) < 0)
983  return ret;
984 
985  d->s = s;
986  d->level = 0;
987  d->descr_count = 0;
988  d->descr = descr;
989  d->active_descr = NULL;
990  d->max_descr_count = max_descr_count;
991 
992  return 0;
993 }
994 
995 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
996  int64_t new_off = avio_tell(pb);
997  (*len) -= new_off - *off;
998  *off = new_off;
999 }
1000 
1001 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1002  int target_tag);
1003 
1004 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1005 {
1006  while (len > 0) {
1007  if (parse_mp4_descr(d, off, len, 0) < 0)
1008  return -1;
1009  update_offsets(&d->pb, &off, &len);
1010  }
1011  return 0;
1012 }
1013 
1014 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1015 {
1016  avio_rb16(&d->pb); // ID
1017  avio_r8(&d->pb);
1018  avio_r8(&d->pb);
1019  avio_r8(&d->pb);
1020  avio_r8(&d->pb);
1021  avio_r8(&d->pb);
1022  update_offsets(&d->pb, &off, &len);
1023  return parse_mp4_descr_arr(d, off, len);
1024 }
1025 
1026 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1027 {
1028  int id_flags;
1029  if (len < 2)
1030  return 0;
1031  id_flags = avio_rb16(&d->pb);
1032  if (!(id_flags & 0x0020)) { //URL_Flag
1033  update_offsets(&d->pb, &off, &len);
1034  return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1035  } else {
1036  return 0;
1037  }
1038 }
1039 
1040 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1041 {
1042  int es_id = 0;
1043  if (d->descr_count >= d->max_descr_count)
1044  return -1;
1045  ff_mp4_parse_es_descr(&d->pb, &es_id);
1046  d->active_descr = d->descr + (d->descr_count++);
1047 
1048  d->active_descr->es_id = es_id;
1049  update_offsets(&d->pb, &off, &len);
1050  parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1051  update_offsets(&d->pb, &off, &len);
1052  if (len > 0)
1053  parse_mp4_descr(d, off, len, MP4SLDescrTag);
1054  d->active_descr = NULL;
1055  return 0;
1056 }
1057 
1059 {
1060  Mp4Descr *descr = d->active_descr;
1061  if (!descr)
1062  return -1;
1064  if (!descr->dec_config_descr)
1065  return AVERROR(ENOMEM);
1066  descr->dec_config_descr_len = len;
1067  avio_read(&d->pb, descr->dec_config_descr, len);
1068  return 0;
1069 }
1070 
1071 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1072 {
1073  Mp4Descr *descr = d->active_descr;
1074  int predefined;
1075  if (!descr)
1076  return -1;
1077 
1078  predefined = avio_r8(&d->pb);
1079  if (!predefined) {
1080  int lengths;
1081  int flags = avio_r8(&d->pb);
1082  descr->sl.use_au_start = !!(flags & 0x80);
1083  descr->sl.use_au_end = !!(flags & 0x40);
1084  descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1085  descr->sl.use_padding = !!(flags & 0x08);
1086  descr->sl.use_timestamps = !!(flags & 0x04);
1087  descr->sl.use_idle = !!(flags & 0x02);
1088  descr->sl.timestamp_res = avio_rb32(&d->pb);
1089  avio_rb32(&d->pb);
1090  descr->sl.timestamp_len = avio_r8(&d->pb);
1091  descr->sl.ocr_len = avio_r8(&d->pb);
1092  descr->sl.au_len = avio_r8(&d->pb);
1093  descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1094  lengths = avio_rb16(&d->pb);
1095  descr->sl.degr_prior_len = lengths >> 12;
1096  descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1097  descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1098  } else {
1099  av_log_missing_feature(d->s, "Predefined SLConfigDescriptor\n", 0);
1100  }
1101  return 0;
1102 }
1103 
1104 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1105  int target_tag) {
1106  int tag;
1107  int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1108  update_offsets(&d->pb, &off, &len);
1109  if (len < 0 || len1 > len || len1 <= 0) {
1110  av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1111  return -1;
1112  }
1113 
1114  if (d->level++ >= MAX_LEVEL) {
1115  av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1116  goto done;
1117  }
1118 
1119  if (target_tag && tag != target_tag) {
1120  av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1121  goto done;
1122  }
1123 
1124  switch (tag) {
1125  case MP4IODescrTag:
1126  parse_MP4IODescrTag(d, off, len1);
1127  break;
1128  case MP4ODescrTag:
1129  parse_MP4ODescrTag(d, off, len1);
1130  break;
1131  case MP4ESDescrTag:
1132  parse_MP4ESDescrTag(d, off, len1);
1133  break;
1134  case MP4DecConfigDescrTag:
1135  parse_MP4DecConfigDescrTag(d, off, len1);
1136  break;
1137  case MP4SLDescrTag:
1138  parse_MP4SLDescrTag(d, off, len1);
1139  break;
1140  }
1141 
1142 done:
1143  d->level--;
1144  avio_seek(&d->pb, off + len1, SEEK_SET);
1145  return 0;
1146 }
1147 
1148 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1149  Mp4Descr *descr, int *descr_count, int max_descr_count)
1150 {
1152  if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1153  return -1;
1154 
1155  parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1156 
1157  *descr_count = d.descr_count;
1158  return 0;
1159 }
1160 
1161 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1162  Mp4Descr *descr, int *descr_count, int max_descr_count)
1163 {
1165  if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1166  return -1;
1167 
1168  parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1169 
1170  *descr_count = d.descr_count;
1171  return 0;
1172 }
1173 
1174 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1175 {
1176  MpegTSContext *ts = filter->u.section_filter.opaque;
1177  SectionHeader h;
1178  const uint8_t *p, *p_end;
1179  AVIOContext pb;
1180  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1181  int mp4_descr_count = 0;
1182  int i, pid;
1183  AVFormatContext *s = ts->stream;
1184 
1185  p_end = section + section_len - 4;
1186  p = section;
1187  if (parse_section_header(&h, &p, p_end) < 0)
1188  return;
1189  if (h.tid != M4OD_TID)
1190  return;
1191 
1192  mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1193 
1194  for (pid = 0; pid < NB_PID_MAX; pid++) {
1195  if (!ts->pids[pid])
1196  continue;
1197  for (i = 0; i < mp4_descr_count; i++) {
1198  PESContext *pes;
1199  AVStream *st;
1200  if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1201  continue;
1202  if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1203  av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1204  continue;
1205  }
1206  pes = ts->pids[pid]->u.pes_filter.opaque;
1207  st = pes->st;
1208  if (!st) {
1209  continue;
1210  }
1211 
1212  pes->sl = mp4_descr[i].sl;
1213 
1214  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1215  mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1216  ff_mp4_read_dec_config_descr(s, st, &pb);
1217  if (st->codec->codec_id == CODEC_ID_AAC &&
1218  st->codec->extradata_size > 0)
1219  st->need_parsing = 0;
1220  if (st->codec->codec_id == CODEC_ID_H264 &&
1221  st->codec->extradata_size > 0)
1222  st->need_parsing = 0;
1223 
1224  if (st->codec->codec_id <= CODEC_ID_NONE) {
1225  } else if (st->codec->codec_id < CODEC_ID_FIRST_AUDIO) {
1227  } else if (st->codec->codec_id < CODEC_ID_FIRST_SUBTITLE) {
1229  } else if (st->codec->codec_id < CODEC_ID_FIRST_UNKNOWN) {
1231  }
1232  }
1233  }
1234  for (i = 0; i < mp4_descr_count; i++)
1235  av_free(mp4_descr[i].dec_config_descr);
1236 }
1237 
1239  const uint8_t **pp, const uint8_t *desc_list_end,
1240  Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1241  MpegTSContext *ts)
1242 {
1243  const uint8_t *desc_end;
1244  int desc_len, desc_tag, desc_es_id;
1245  char language[252];
1246  int i;
1247 
1248  desc_tag = get8(pp, desc_list_end);
1249  if (desc_tag < 0)
1250  return -1;
1251  desc_len = get8(pp, desc_list_end);
1252  if (desc_len < 0)
1253  return -1;
1254  desc_end = *pp + desc_len;
1255  if (desc_end > desc_list_end)
1256  return -1;
1257 
1258  av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1259 
1260  if (st->codec->codec_id == CODEC_ID_NONE &&
1261  stream_type == STREAM_TYPE_PRIVATE_DATA)
1262  mpegts_find_stream_type(st, desc_tag, DESC_types);
1263 
1264  switch(desc_tag) {
1265  case 0x1E: /* SL descriptor */
1266  desc_es_id = get16(pp, desc_end);
1267  if (ts && ts->pids[pid])
1268  ts->pids[pid]->es_id = desc_es_id;
1269  for (i = 0; i < mp4_descr_count; i++)
1270  if (mp4_descr[i].dec_config_descr_len &&
1271  mp4_descr[i].es_id == desc_es_id) {
1272  AVIOContext pb;
1273  ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1274  mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1275  ff_mp4_read_dec_config_descr(fc, st, &pb);
1276  if (st->codec->codec_id == CODEC_ID_AAC &&
1277  st->codec->extradata_size > 0)
1278  st->need_parsing = 0;
1279  if (st->codec->codec_id == CODEC_ID_MPEG4SYSTEMS)
1280  mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1281  }
1282  break;
1283  case 0x1F: /* FMC descriptor */
1284  get16(pp, desc_end);
1285  if (mp4_descr_count > 0 && st->codec->codec_id == CODEC_ID_AAC_LATM &&
1286  mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1287  AVIOContext pb;
1288  ffio_init_context(&pb, mp4_descr->dec_config_descr,
1289  mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1290  ff_mp4_read_dec_config_descr(fc, st, &pb);
1291  if (st->codec->codec_id == CODEC_ID_AAC &&
1292  st->codec->extradata_size > 0)
1293  st->need_parsing = 0;
1294  }
1295  break;
1296  case 0x56: /* DVB teletext descriptor */
1297  language[0] = get8(pp, desc_end);
1298  language[1] = get8(pp, desc_end);
1299  language[2] = get8(pp, desc_end);
1300  language[3] = 0;
1301  av_dict_set(&st->metadata, "language", language, 0);
1302  break;
1303  case 0x59: /* subtitling descriptor */
1304  language[0] = get8(pp, desc_end);
1305  language[1] = get8(pp, desc_end);
1306  language[2] = get8(pp, desc_end);
1307  language[3] = 0;
1308  /* hearing impaired subtitles detection */
1309  switch(get8(pp, desc_end)) {
1310  case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1311  case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1312  case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1313  case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1314  case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1315  case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1317  break;
1318  }
1319  if (st->codec->extradata) {
1320  if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1321  av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1322  } else {
1324  if (st->codec->extradata) {
1325  st->codec->extradata_size = 4;
1326  memcpy(st->codec->extradata, *pp, 4);
1327  }
1328  }
1329  *pp += 4;
1330  av_dict_set(&st->metadata, "language", language, 0);
1331  break;
1332  case 0x0a: /* ISO 639 language descriptor */
1333  for (i = 0; i + 4 <= desc_len; i += 4) {
1334  language[i + 0] = get8(pp, desc_end);
1335  language[i + 1] = get8(pp, desc_end);
1336  language[i + 2] = get8(pp, desc_end);
1337  language[i + 3] = ',';
1338  switch (get8(pp, desc_end)) {
1339  case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1340  case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1341  case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1342  }
1343  }
1344  if (i) {
1345  language[i - 1] = 0;
1346  av_dict_set(&st->metadata, "language", language, 0);
1347  }
1348  break;
1349  case 0x05: /* registration descriptor */
1350  st->codec->codec_tag = bytestream_get_le32(pp);
1351  av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1352  if (st->codec->codec_id == CODEC_ID_NONE &&
1353  stream_type == STREAM_TYPE_PRIVATE_DATA)
1354  mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1355  break;
1356  default:
1357  break;
1358  }
1359  *pp = desc_end;
1360  return 0;
1361 }
1362 
1363 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1364 {
1365  MpegTSContext *ts = filter->u.section_filter.opaque;
1366  SectionHeader h1, *h = &h1;
1367  PESContext *pes;
1368  AVStream *st;
1369  const uint8_t *p, *p_end, *desc_list_end;
1370  int program_info_length, pcr_pid, pid, stream_type;
1371  int desc_list_len;
1372  uint32_t prog_reg_desc = 0; /* registration descriptor */
1373 
1374  Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1375  int mp4_descr_count = 0;
1376  int i;
1377 
1378  av_dlog(ts->stream, "PMT: len %i\n", section_len);
1379  hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1380 
1381  p_end = section + section_len - 4;
1382  p = section;
1383  if (parse_section_header(h, &p, p_end) < 0)
1384  return;
1385 
1386  av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1387  h->id, h->sec_num, h->last_sec_num);
1388 
1389  if (h->tid != PMT_TID)
1390  return;
1391 
1392  clear_program(ts, h->id);
1393  pcr_pid = get16(&p, p_end) & 0x1fff;
1394  if (pcr_pid < 0)
1395  return;
1396  add_pid_to_pmt(ts, h->id, pcr_pid);
1397 
1398  av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1399 
1400  program_info_length = get16(&p, p_end) & 0xfff;
1401  if (program_info_length < 0)
1402  return;
1403  while(program_info_length >= 2) {
1404  uint8_t tag, len;
1405  tag = get8(&p, p_end);
1406  len = get8(&p, p_end);
1407 
1408  av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1409 
1410  if(len > program_info_length - 2)
1411  //something else is broken, exit the program_descriptors_loop
1412  break;
1413  program_info_length -= len + 2;
1414  if (tag == 0x1d) { // IOD descriptor
1415  get8(&p, p_end); // scope
1416  get8(&p, p_end); // label
1417  len -= 2;
1418  mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1419  &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1420  } else if (tag == 0x05 && len >= 4) { // registration descriptor
1421  prog_reg_desc = bytestream_get_le32(&p);
1422  len -= 4;
1423  }
1424  p += len;
1425  }
1426  p += program_info_length;
1427  if (p >= p_end)
1428  goto out;
1429 
1430  // stop parsing after pmt, we found header
1431  if (!ts->stream->nb_streams)
1432  ts->stop_parse = 1;
1433 
1434  for(;;) {
1435  st = 0;
1436  pes = NULL;
1437  stream_type = get8(&p, p_end);
1438  if (stream_type < 0)
1439  break;
1440  pid = get16(&p, p_end) & 0x1fff;
1441  if (pid < 0)
1442  break;
1443 
1444  /* now create stream */
1445  if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1446  pes = ts->pids[pid]->u.pes_filter.opaque;
1447  if (!pes->st) {
1448  pes->st = avformat_new_stream(pes->stream, NULL);
1449  pes->st->id = pes->pid;
1450  }
1451  st = pes->st;
1452  } else if (stream_type != 0x13) {
1453  if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1454  pes = add_pes_stream(ts, pid, pcr_pid);
1455  if (pes) {
1456  st = avformat_new_stream(pes->stream, NULL);
1457  st->id = pes->pid;
1458  }
1459  } else {
1460  int idx = ff_find_stream_index(ts->stream, pid);
1461  if (idx >= 0) {
1462  st = ts->stream->streams[idx];
1463  } else {
1464  st = avformat_new_stream(ts->stream, NULL);
1465  st->id = pid;
1467  }
1468  }
1469 
1470  if (!st)
1471  goto out;
1472 
1473  if (pes && !pes->stream_type)
1474  mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1475 
1476  add_pid_to_pmt(ts, h->id, pid);
1477 
1479 
1480  desc_list_len = get16(&p, p_end) & 0xfff;
1481  if (desc_list_len < 0)
1482  break;
1483  desc_list_end = p + desc_list_len;
1484  if (desc_list_end > p_end)
1485  break;
1486  for(;;) {
1487  if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1488  mp4_descr, mp4_descr_count, pid, ts) < 0)
1489  break;
1490 
1491  if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1493  pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1494  }
1495  }
1496  p = desc_list_end;
1497  }
1498 
1499  out:
1500  for (i = 0; i < mp4_descr_count; i++)
1501  av_free(mp4_descr[i].dec_config_descr);
1502 }
1503 
1504 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1505 {
1506  MpegTSContext *ts = filter->u.section_filter.opaque;
1507  SectionHeader h1, *h = &h1;
1508  const uint8_t *p, *p_end;
1509  int sid, pmt_pid;
1510 
1511  av_dlog(ts->stream, "PAT:\n");
1512  hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1513 
1514  p_end = section + section_len - 4;
1515  p = section;
1516  if (parse_section_header(h, &p, p_end) < 0)
1517  return;
1518  if (h->tid != PAT_TID)
1519  return;
1520 
1521  clear_programs(ts);
1522  for(;;) {
1523  sid = get16(&p, p_end);
1524  if (sid < 0)
1525  break;
1526  pmt_pid = get16(&p, p_end) & 0x1fff;
1527  if (pmt_pid < 0)
1528  break;
1529 
1530  av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1531 
1532  if (sid == 0x0000) {
1533  /* NIT info */
1534  } else {
1535  av_new_program(ts->stream, sid);
1536  if (ts->pids[pmt_pid])
1537  mpegts_close_filter(ts, ts->pids[pmt_pid]);
1538  mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1539  add_pat_entry(ts, sid);
1540  add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1541  add_pid_to_pmt(ts, sid, pmt_pid);
1542  }
1543  }
1544 }
1545 
1546 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1547 {
1548  MpegTSContext *ts = filter->u.section_filter.opaque;
1549  SectionHeader h1, *h = &h1;
1550  const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1551  int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1552  char *name, *provider_name;
1553 
1554  av_dlog(ts->stream, "SDT:\n");
1555  hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1556 
1557  p_end = section + section_len - 4;
1558  p = section;
1559  if (parse_section_header(h, &p, p_end) < 0)
1560  return;
1561  if (h->tid != SDT_TID)
1562  return;
1563  onid = get16(&p, p_end);
1564  if (onid < 0)
1565  return;
1566  val = get8(&p, p_end);
1567  if (val < 0)
1568  return;
1569  for(;;) {
1570  sid = get16(&p, p_end);
1571  if (sid < 0)
1572  break;
1573  val = get8(&p, p_end);
1574  if (val < 0)
1575  break;
1576  desc_list_len = get16(&p, p_end) & 0xfff;
1577  if (desc_list_len < 0)
1578  break;
1579  desc_list_end = p + desc_list_len;
1580  if (desc_list_end > p_end)
1581  break;
1582  for(;;) {
1583  desc_tag = get8(&p, desc_list_end);
1584  if (desc_tag < 0)
1585  break;
1586  desc_len = get8(&p, desc_list_end);
1587  desc_end = p + desc_len;
1588  if (desc_end > desc_list_end)
1589  break;
1590 
1591  av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1592  desc_tag, desc_len);
1593 
1594  switch(desc_tag) {
1595  case 0x48:
1596  service_type = get8(&p, p_end);
1597  if (service_type < 0)
1598  break;
1599  provider_name = getstr8(&p, p_end);
1600  if (!provider_name)
1601  break;
1602  name = getstr8(&p, p_end);
1603  if (name) {
1604  AVProgram *program = av_new_program(ts->stream, sid);
1605  if(program) {
1606  av_dict_set(&program->metadata, "service_name", name, 0);
1607  av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1608  }
1609  }
1610  av_free(name);
1611  av_free(provider_name);
1612  break;
1613  default:
1614  break;
1615  }
1616  p = desc_end;
1617  }
1618  p = desc_list_end;
1619  }
1620 }
1621 
1622 /* handle one TS packet */
1623 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1624 {
1625  AVFormatContext *s = ts->stream;
1626  MpegTSFilter *tss;
1627  int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1628  has_adaptation, has_payload;
1629  const uint8_t *p, *p_end;
1630  int64_t pos;
1631 
1632  pid = AV_RB16(packet + 1) & 0x1fff;
1633  if(pid && discard_pid(ts, pid))
1634  return 0;
1635  is_start = packet[1] & 0x40;
1636  tss = ts->pids[pid];
1637  if (ts->auto_guess && tss == NULL && is_start) {
1638  add_pes_stream(ts, pid, -1);
1639  tss = ts->pids[pid];
1640  }
1641  if (!tss)
1642  return 0;
1643 
1644  afc = (packet[3] >> 4) & 3;
1645  if (afc == 0) /* reserved value */
1646  return 0;
1647  has_adaptation = afc & 2;
1648  has_payload = afc & 1;
1649  is_discontinuity = has_adaptation
1650  && packet[4] != 0 /* with length > 0 */
1651  && (packet[5] & 0x80); /* and discontinuity indicated */
1652 
1653  /* continuity check (currently not used) */
1654  cc = (packet[3] & 0xf);
1655  expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1656  cc_ok = pid == 0x1FFF // null packet PID
1657  || is_discontinuity
1658  || tss->last_cc < 0
1659  || expected_cc == cc;
1660 
1661  tss->last_cc = cc;
1662  if (!cc_ok) {
1664  "Continuity check failed for pid %d expected %d got %d\n",
1665  pid, expected_cc, cc);
1666  if(tss->type == MPEGTS_PES) {
1667  PESContext *pc = tss->u.pes_filter.opaque;
1668  pc->flags |= AV_PKT_FLAG_CORRUPT;
1669  }
1670  }
1671 
1672  if (!has_payload)
1673  return 0;
1674  p = packet + 4;
1675  if (has_adaptation) {
1676  /* skip adaptation field */
1677  p += p[0] + 1;
1678  }
1679  /* if past the end of packet, ignore */
1680  p_end = packet + TS_PACKET_SIZE;
1681  if (p >= p_end)
1682  return 0;
1683 
1684  pos = avio_tell(ts->stream->pb);
1685  ts->pos47= pos % ts->raw_packet_size;
1686 
1687  if (tss->type == MPEGTS_SECTION) {
1688  if (is_start) {
1689  /* pointer field present */
1690  len = *p++;
1691  if (p + len > p_end)
1692  return 0;
1693  if (len && cc_ok) {
1694  /* write remaining section bytes */
1695  write_section_data(s, tss,
1696  p, len, 0);
1697  /* check whether filter has been closed */
1698  if (!ts->pids[pid])
1699  return 0;
1700  }
1701  p += len;
1702  if (p < p_end) {
1703  write_section_data(s, tss,
1704  p, p_end - p, 1);
1705  }
1706  } else {
1707  if (cc_ok) {
1708  write_section_data(s, tss,
1709  p, p_end - p, 0);
1710  }
1711  }
1712  } else {
1713  int ret;
1714  // Note: The position here points actually behind the current packet.
1715  if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1716  pos - ts->raw_packet_size)) < 0)
1717  return ret;
1718  }
1719 
1720  return 0;
1721 }
1722 
1723 /* XXX: try to find a better synchro over several packets (use
1724  get_packet_size() ?) */
1726 {
1727  AVIOContext *pb = s->pb;
1728  int c, i;
1729 
1730  for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1731  c = avio_r8(pb);
1732  if (pb->eof_reached)
1733  return -1;
1734  if (c == 0x47) {
1735  avio_seek(pb, -1, SEEK_CUR);
1736  return 0;
1737  }
1738  }
1739  av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1740  /* no sync found */
1741  return -1;
1742 }
1743 
1744 /* return -1 if error or EOF. Return 0 if OK. */
1745 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1746 {
1747  AVIOContext *pb = s->pb;
1748  int skip, len;
1749 
1750  for(;;) {
1751  len = avio_read(pb, buf, TS_PACKET_SIZE);
1752  if (len != TS_PACKET_SIZE)
1753  return len < 0 ? len : AVERROR_EOF;
1754  /* check packet sync byte */
1755  if (buf[0] != 0x47) {
1756  /* find a new packet start */
1757  avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1758  if (mpegts_resync(s) < 0)
1759  return AVERROR(EAGAIN);
1760  else
1761  continue;
1762  } else {
1763  skip = raw_packet_size - TS_PACKET_SIZE;
1764  if (skip > 0)
1765  avio_skip(pb, skip);
1766  break;
1767  }
1768  }
1769  return 0;
1770 }
1771 
1772 static int handle_packets(MpegTSContext *ts, int nb_packets)
1773 {
1774  AVFormatContext *s = ts->stream;
1776  int packet_num, ret = 0;
1777 
1778  if (avio_tell(s->pb) != ts->last_pos) {
1779  int i;
1780  av_dlog(ts->stream, "Skipping after seek\n");
1781  /* seek detected, flush pes buffer */
1782  for (i = 0; i < NB_PID_MAX; i++) {
1783  if (ts->pids[i]) {
1784  if (ts->pids[i]->type == MPEGTS_PES) {
1785  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1786  av_freep(&pes->buffer);
1787  pes->data_index = 0;
1788  pes->state = MPEGTS_SKIP; /* skip until pes header */
1789  }
1790  ts->pids[i]->last_cc = -1;
1791  }
1792  }
1793  }
1794 
1795  ts->stop_parse = 0;
1796  packet_num = 0;
1797  memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1798  for(;;) {
1799  if (ts->stop_parse>0)
1800  break;
1801  packet_num++;
1802  if (nb_packets != 0 && packet_num >= nb_packets)
1803  break;
1804  ret = read_packet(s, packet, ts->raw_packet_size);
1805  if (ret != 0)
1806  break;
1807  ret = handle_packet(ts, packet);
1808  if (ret != 0)
1809  break;
1810  }
1811  ts->last_pos = avio_tell(s->pb);
1812  return ret;
1813 }
1814 
1816 {
1817 #if 1
1818  const int size= p->buf_size;
1819  int score, fec_score, dvhs_score;
1820  int check_count= size / TS_FEC_PACKET_SIZE;
1821 #define CHECK_COUNT 10
1822 
1823  if (check_count < CHECK_COUNT)
1824  return -1;
1825 
1826  score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1827  dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1828  fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1829 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1830 
1831 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1832  if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1833  else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1834  else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1835  else return -1;
1836 #else
1837  /* only use the extension for safer guess */
1838  if (av_match_ext(p->filename, "ts"))
1839  return AVPROBE_SCORE_MAX;
1840  else
1841  return 0;
1842 #endif
1843 }
1844 
1845 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1846  (-1) if not available */
1847 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1848  const uint8_t *packet)
1849 {
1850  int afc, len, flags;
1851  const uint8_t *p;
1852  unsigned int v;
1853 
1854  afc = (packet[3] >> 4) & 3;
1855  if (afc <= 1)
1856  return -1;
1857  p = packet + 4;
1858  len = p[0];
1859  p++;
1860  if (len == 0)
1861  return -1;
1862  flags = *p++;
1863  len--;
1864  if (!(flags & 0x10))
1865  return -1;
1866  if (len < 6)
1867  return -1;
1868  v = AV_RB32(p);
1869  *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1870  *ppcr_low = ((p[4] & 1) << 8) | p[5];
1871  return 0;
1872 }
1873 
1875  AVFormatParameters *ap)
1876 {
1877  MpegTSContext *ts = s->priv_data;
1878  AVIOContext *pb = s->pb;
1879  uint8_t buf[5*1024];
1880  int len;
1881  int64_t pos;
1882 
1883  /* read the first 1024 bytes to get packet size */
1884  pos = avio_tell(pb);
1885  len = avio_read(pb, buf, sizeof(buf));
1886  if (len != sizeof(buf))
1887  goto fail;
1888  ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1889  if (ts->raw_packet_size <= 0)
1890  goto fail;
1891  ts->stream = s;
1892  ts->auto_guess = 0;
1893 
1894  if (s->iformat == &ff_mpegts_demuxer) {
1895  /* normal demux */
1896 
1897  /* first do a scan to get all the services */
1898  if (pb->seekable && avio_seek(pb, pos, SEEK_SET) < 0)
1899  av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1900 
1902 
1904 
1906  /* if could not find service, enable auto_guess */
1907 
1908  ts->auto_guess = 1;
1909 
1910  av_dlog(ts->stream, "tuning done\n");
1911 
1913  } else {
1914  AVStream *st;
1915  int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1916  int64_t pcrs[2], pcr_h;
1917  int packet_count[2];
1918  uint8_t packet[TS_PACKET_SIZE];
1919 
1920  /* only read packets */
1921 
1922  st = avformat_new_stream(s, NULL);
1923  if (!st)
1924  goto fail;
1925  avpriv_set_pts_info(st, 60, 1, 27000000);
1928 
1929  /* we iterate until we find two PCRs to estimate the bitrate */
1930  pcr_pid = -1;
1931  nb_pcrs = 0;
1932  nb_packets = 0;
1933  for(;;) {
1934  ret = read_packet(s, packet, ts->raw_packet_size);
1935  if (ret < 0)
1936  return -1;
1937  pid = AV_RB16(packet + 1) & 0x1fff;
1938  if ((pcr_pid == -1 || pcr_pid == pid) &&
1939  parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1940  pcr_pid = pid;
1941  packet_count[nb_pcrs] = nb_packets;
1942  pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1943  nb_pcrs++;
1944  if (nb_pcrs >= 2)
1945  break;
1946  }
1947  nb_packets++;
1948  }
1949 
1950  /* NOTE1: the bitrate is computed without the FEC */
1951  /* NOTE2: it is only the bitrate of the start of the stream */
1952  ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1953  ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1954  s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1955  st->codec->bit_rate = s->bit_rate;
1956  st->start_time = ts->cur_pcr;
1957  av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1958  st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1959  }
1960 
1961  avio_seek(pb, pos, SEEK_SET);
1962  return 0;
1963  fail:
1964  return -1;
1965 }
1966 
1967 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1968 
1970  AVPacket *pkt)
1971 {
1972  MpegTSContext *ts = s->priv_data;
1973  int ret, i;
1974  int64_t pcr_h, next_pcr_h, pos;
1975  int pcr_l, next_pcr_l;
1976  uint8_t pcr_buf[12];
1977 
1978  if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1979  return AVERROR(ENOMEM);
1980  pkt->pos= avio_tell(s->pb);
1981  ret = read_packet(s, pkt->data, ts->raw_packet_size);
1982  if (ret < 0) {
1983  av_free_packet(pkt);
1984  return ret;
1985  }
1986  if (ts->mpeg2ts_compute_pcr) {
1987  /* compute exact PCR for each packet */
1988  if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1989  /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1990  pos = avio_tell(s->pb);
1991  for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1992  avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1993  avio_read(s->pb, pcr_buf, 12);
1994  if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1995  /* XXX: not precise enough */
1996  ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1997  (i + 1);
1998  break;
1999  }
2000  }
2001  avio_seek(s->pb, pos, SEEK_SET);
2002  /* no next PCR found: we use previous increment */
2003  ts->cur_pcr = pcr_h * 300 + pcr_l;
2004  }
2005  pkt->pts = ts->cur_pcr;
2006  pkt->duration = ts->pcr_incr;
2007  ts->cur_pcr += ts->pcr_incr;
2008  }
2009  pkt->stream_index = 0;
2010  return 0;
2011 }
2012 
2014  AVPacket *pkt)
2015 {
2016  MpegTSContext *ts = s->priv_data;
2017  int ret, i;
2018 
2019  ts->pkt = pkt;
2020  ret = handle_packets(ts, 0);
2021  if (ret < 0) {
2022  /* flush pes data left */
2023  for (i = 0; i < NB_PID_MAX; i++) {
2024  if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2025  PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2026  if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2027  new_pes_packet(pes, pkt);
2028  pes->state = MPEGTS_SKIP;
2029  ret = 0;
2030  break;
2031  }
2032  }
2033  }
2034  }
2035 
2036  return ret;
2037 }
2038 
2040 {
2041  MpegTSContext *ts = s->priv_data;
2042  int i;
2043 
2044  clear_programs(ts);
2045 
2046  for(i=0;i<NB_PID_MAX;i++)
2047  if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2048 
2049  return 0;
2050 }
2051 
2052 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2053  int64_t *ppos, int64_t pos_limit)
2054 {
2055  MpegTSContext *ts = s->priv_data;
2056  int64_t pos, timestamp;
2057  uint8_t buf[TS_PACKET_SIZE];
2058  int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2059  const int find_next= 1;
2060  pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2061  if (find_next) {
2062  for(;;) {
2063  avio_seek(s->pb, pos, SEEK_SET);
2064  if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2065  return AV_NOPTS_VALUE;
2066  if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2067  parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2068  break;
2069  }
2070  pos += ts->raw_packet_size;
2071  }
2072  } else {
2073  for(;;) {
2074  pos -= ts->raw_packet_size;
2075  if (pos < 0)
2076  return AV_NOPTS_VALUE;
2077  avio_seek(s->pb, pos, SEEK_SET);
2078  if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2079  return AV_NOPTS_VALUE;
2080  if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2081  parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2082  break;
2083  }
2084  }
2085  }
2086  *ppos = pos;
2087 
2088  return timestamp;
2089 }
2090 
2091 #ifdef USE_SYNCPOINT_SEARCH
2092 
2093 static int read_seek2(AVFormatContext *s,
2094  int stream_index,
2095  int64_t min_ts,
2096  int64_t target_ts,
2097  int64_t max_ts,
2098  int flags)
2099 {
2100  int64_t pos;
2101 
2102  int64_t ts_ret, ts_adj;
2103  int stream_index_gen_search;
2104  AVStream *st;
2105  AVParserState *backup;
2106 
2107  backup = ff_store_parser_state(s);
2108 
2109  // detect direction of seeking for search purposes
2110  flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
2112 
2113  if (flags & AVSEEK_FLAG_BYTE) {
2114  // use position directly, we will search starting from it
2115  pos = target_ts;
2116  } else {
2117  // search for some position with good timestamp match
2118  if (stream_index < 0) {
2119  stream_index_gen_search = av_find_default_stream_index(s);
2120  if (stream_index_gen_search < 0) {
2121  ff_restore_parser_state(s, backup);
2122  return -1;
2123  }
2124 
2125  st = s->streams[stream_index_gen_search];
2126  // timestamp for default must be expressed in AV_TIME_BASE units
2127  ts_adj = av_rescale(target_ts,
2128  st->time_base.den,
2129  AV_TIME_BASE * (int64_t)st->time_base.num);
2130  } else {
2131  ts_adj = target_ts;
2132  stream_index_gen_search = stream_index;
2133  }
2134  pos = ff_gen_search(s, stream_index_gen_search, ts_adj,
2135  0, INT64_MAX, -1,
2138  flags, &ts_ret, mpegts_get_pcr);
2139  if (pos < 0) {
2140  ff_restore_parser_state(s, backup);
2141  return -1;
2142  }
2143  }
2144 
2145  // search for actual matching keyframe/starting position for all streams
2146  if (ff_gen_syncpoint_search(s, stream_index, pos,
2147  min_ts, target_ts, max_ts,
2148  flags) < 0) {
2149  ff_restore_parser_state(s, backup);
2150  return -1;
2151  }
2152 
2153  ff_free_parser_state(s, backup);
2154  return 0;
2155 }
2156 
2157 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
2158 {
2159  int ret;
2160  if (flags & AVSEEK_FLAG_BACKWARD) {
2161  flags &= ~AVSEEK_FLAG_BACKWARD;
2162  ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
2163  if (ret < 0)
2164  // for compatibility reasons, seek to the best-fitting timestamp
2165  ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
2166  } else {
2167  ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
2168  if (ret < 0)
2169  // for compatibility reasons, seek to the best-fitting timestamp
2170  ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
2171  }
2172  return ret;
2173 }
2174 
2175 #else
2176 
2177 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
2178  MpegTSContext *ts = s->priv_data;
2179  uint8_t buf[TS_PACKET_SIZE];
2180  int64_t pos;
2181 
2182  if (ff_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
2183  return -1;
2184 
2185  pos= avio_tell(s->pb);
2186 
2187  for(;;) {
2188  avio_seek(s->pb, pos, SEEK_SET);
2189  if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2190  return -1;
2191 // pid = AV_RB16(buf + 1) & 0x1fff;
2192  if(buf[1] & 0x40) break;
2193  pos += ts->raw_packet_size;
2194  }
2195  avio_seek(s->pb, pos, SEEK_SET);
2196 
2197  return 0;
2198 }
2199 
2200 #endif
2201 
2202 /**************************************************************/
2203 /* parsing functions - called from other demuxers such as RTP */
2204 
2206 {
2207  MpegTSContext *ts;
2208 
2209  ts = av_mallocz(sizeof(MpegTSContext));
2210  if (!ts)
2211  return NULL;
2212  /* no stream case, currently used by RTP */
2214  ts->stream = s;
2215  ts->auto_guess = 1;
2216  return ts;
2217 }
2218 
2219 /* return the consumed length if a packet was output, or -1 if no
2220  packet is output */
2222  const uint8_t *buf, int len)
2223 {
2224  int len1;
2225 
2226  len1 = len;
2227  ts->pkt = pkt;
2228  ts->stop_parse = 0;
2229  for(;;) {
2230  if (ts->stop_parse>0)
2231  break;
2232  if (len < TS_PACKET_SIZE)
2233  return -1;
2234  if (buf[0] != 0x47) {
2235  buf++;
2236  len--;
2237  } else {
2238  handle_packet(ts, buf);
2239  buf += TS_PACKET_SIZE;
2240  len -= TS_PACKET_SIZE;
2241  }
2242  }
2243  return len1 - len;
2244 }
2245 
2247 {
2248  int i;
2249 
2250  for(i=0;i<NB_PID_MAX;i++)
2251  av_free(ts->pids[i]);
2252  av_free(ts);
2253 }
2254 
2255 AVInputFormat ff_mpegts_demuxer = {
2256  .name = "mpegts",
2257  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
2258  .priv_data_size = sizeof(MpegTSContext),
2263  .read_seek = read_seek,
2264  .read_timestamp = mpegts_get_pcr,
2266 #ifdef USE_SYNCPOINT_SEARCH
2268 #endif
2269 };
2270 
2272  .name = "mpegtsraw",
2273  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
2274  .priv_data_size = sizeof(MpegTSContext),
2278  .read_seek = read_seek,
2279  .read_timestamp = mpegts_get_pcr,
2281 #ifdef USE_SYNCPOINT_SEARCH
2283 #endif
2284  .priv_class = &mpegtsraw_class,
2285 };