libavformat/mpegts.c

   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/crc.h"
  23 #include "libavutil/intreadwrite.h"
  24 #include "avformat.h"
  25 #include "mpegts.h"
  26 #include "internal.h"
  27
  28 //#define DEBUG_SI
  29 //#define DEBUG_SEEK
  30
  31 /* 1.0 second at 24Mbit/s */
  32 #define MAX_SCAN_PACKETS 32000
  33
  34 /* maximum size in which we look for synchronisation if
  35    synchronisation is lost */
  36 #define MAX_RESYNC_SIZE 4096
  37 #define REGISTRATION_DESCRIPTOR 5
  38
  39 typedef struct PESContext PESContext;
  40
  41 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
  42 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
  43
  44 enum MpegTSFilterType {
  45     MPEGTS_PES,
  46     MPEGTS_SECTION,
  47 };
  48
  49 typedef struct MpegTSFilter MpegTSFilter;
  50
  51 typedef void PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
  52
  53 typedef struct MpegTSPESFilter {
  54     PESCallback *pes_cb;
  55     void *opaque;
  56 } MpegTSPESFilter;
  57
  58 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
  59
  60 typedef void SetServiceCallback(void *opaque, int ret);
  61
  62 typedef struct MpegTSSectionFilter {
  63     int section_index;
  64     int section_h_size;
  65     uint8_t *section_buf;
  66     unsigned int check_crc:1;
  67     unsigned int end_of_section_reached:1;
  68     SectionCallback *section_cb;
  69     void *opaque;
  70 } MpegTSSectionFilter;
  71
  72 struct MpegTSFilter {
  73     int pid;
  74     int last_cc; /* last cc code (-1 if first packet) */
  75     enum MpegTSFilterType type;
  76     union {
  77         MpegTSPESFilter pes_filter;
  78         MpegTSSectionFilter section_filter;
  79     } u;
  80 };
  81
  82 #define MAX_PIDS_PER_PROGRAM 64
  83 struct Program {
  84     unsigned int id; //program id/service id
  85     unsigned int nb_pids;
  86     unsigned int pids[MAX_PIDS_PER_PROGRAM];
  87 };
  88
  89 struct MpegTSContext {
  90     /* user data */
  91     AVFormatContext *stream;
  92     /** raw packet size, including FEC if present            */
  93     int raw_packet_size;
  94
  95     int pos47;
  96
  97     /** if true, all pids are analyzed to find streams       */
  98     int auto_guess;
  99
 100     /** compute exact PCR for each transport stream packet   */
 101     int mpeg2ts_compute_pcr;
 102
 103     int64_t cur_pcr;    /**< used to estimate the exact PCR  */
 104     int pcr_incr;       /**< used to estimate the exact PCR  */
 105
 106     /* data needed to handle file based ts */
 107     /** stop parsing loop                                    */
 108     int stop_parse;
 109     /** packet containing Audio/Video data                   */
 110     AVPacket *pkt;
 111
 112     /******************************************/
 113     /* private mpegts data */
 114     /* scan context */
 115     /** structure to keep track of Program->pids mapping     */
 116     unsigned int nb_prg;
 117     struct Program *prg;
 118
 119
 120     /** filters for various streams specified by PMT + for the PAT and PMT */
 121     MpegTSFilter *pids[NB_PID_MAX];
 122 };
 123
 124 /* TS stream handling */
 125
 126 enum MpegTSState {
 127     MPEGTS_HEADER = 0,
 128     MPEGTS_PESHEADER_FILL,
 129     MPEGTS_PAYLOAD,
 130     MPEGTS_SKIP,
 131 };
 132
 133 /* enough for PES header + length */
 134 #define PES_START_SIZE 9
 135 #define MAX_PES_HEADER_SIZE (9 + 255)
 136
 137 struct PESContext {
 138     int pid;
 139     int pcr_pid; /**< if -1 then all packets containing PCR are considered */
 140     int stream_type;
 141     MpegTSContext *ts;
 142     AVFormatContext *stream;
 143     AVStream *st;
 144     enum MpegTSState state;
 145     /* used to get the format */
 146     int data_index;
 147     int total_size;
 148     int pes_header_size;
 149     int64_t pts, dts;
 150     int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
 151     uint8_t header[MAX_PES_HEADER_SIZE];
 152 };
 153
 154 extern AVInputFormat mpegts_demuxer;
 155
 156 static void clear_program(MpegTSContext *ts, unsigned int programid)
 157 {
 158     int i;
 159
 160     for(i=0; i<ts->nb_prg; i++)
 161         if(ts->prg[i].id == programid)
 162             ts->prg[i].nb_pids = 0;
 163 }
 164
 165 static void clear_programs(MpegTSContext *ts)
 166 {
 167     av_freep(&ts->prg);
 168     ts->nb_prg=0;
 169 }
 170
 171 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
 172 {
 173     struct Program *p;
 174     void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
 175     if(!tmp)
 176         return;
 177     ts->prg = tmp;
 178     p = &ts->prg[ts->nb_prg];
 179     p->id = programid;
 180     p->nb_pids = 0;
 181     ts->nb_prg++;
 182 }
 183
 184 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
 185 {
 186     int i;
 187     struct Program *p = NULL;
 188     for(i=0; i<ts->nb_prg; i++) {
 189         if(ts->prg[i].id == programid) {
 190             p = &ts->prg[i];
 191             break;
 192         }
 193     }
 194     if(!p)
 195         return;
 196
 197     if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
 198         return;
 199     p->pids[p->nb_pids++] = pid;
 200 }
 201
 202 /**
 203  * \brief discard_pid() decides if the pid is to be discarded according
 204  *                      to caller's programs selection
 205  * \param ts    : - TS context
 206  * \param pid   : - pid
 207  * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
 208  *         0 otherwise
 209  */
 210 static int discard_pid(MpegTSContext *ts, unsigned int pid)
 211 {
 212     int i, j, k;
 213     int used = 0, discarded = 0;
 214     struct Program *p;
 215     for(i=0; i<ts->nb_prg; i++) {
 216         p = &ts->prg[i];
 217         for(j=0; j<p->nb_pids; j++) {
 218             if(p->pids[j] != pid)
 219                 continue;
 220             //is program with id p->id set to be discarded?
 221             for(k=0; k<ts->stream->nb_programs; k++) {
 222                 if(ts->stream->programs[k]->id == p->id) {
 223                     if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
 224                         discarded++;
 225                     else
 226                         used++;
 227                 }
 228             }
 229         }
 230     }
 231
 232     return !used && discarded;
 233 }
 234
 235 /**
 236  *  Assembles PES packets out of TS packets, and then calls the "section_cb"
 237  *  function when they are complete.
 238  */
 239 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
 240                                const uint8_t *buf, int buf_size, int is_start)
 241 {
 242     MpegTSSectionFilter *tss = &tss1->u.section_filter;
 243     int len;
 244
 245     if (is_start) {
 246         memcpy(tss->section_buf, buf, buf_size);
 247         tss->section_index = buf_size;
 248         tss->section_h_size = -1;
 249         tss->end_of_section_reached = 0;
 250     } else {
 251         if (tss->end_of_section_reached)
 252             return;
 253         len = 4096 - tss->section_index;
 254         if (buf_size < len)
 255             len = buf_size;
 256         memcpy(tss->section_buf + tss->section_index, buf, len);
 257         tss->section_index += len;
 258     }
 259
 260     /* compute section length if possible */
 261     if (tss->section_h_size == -1 && tss->section_index >= 3) {
 262         len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
 263         if (len > 4096)
 264             return;
 265         tss->section_h_size = len;
 266     }
 267
 268     if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
 269         tss->end_of_section_reached = 1;
 270         if (!tss->check_crc ||
 271             av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
 272                    tss->section_buf, tss->section_h_size) == 0)
 273             tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
 274     }
 275 }
 276
 277 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
 278                                          SectionCallback *section_cb, void *opaque,
 279                                          int check_crc)
 280
 281 {
 282     MpegTSFilter *filter;
 283     MpegTSSectionFilter *sec;
 284
 285 #ifdef DEBUG_SI
 286     av_log(ts->stream, AV_LOG_DEBUG, "Filter: pid=0x%x\n", pid);
 287 #endif
 288     if (pid >= NB_PID_MAX || ts->pids[pid])
 289         return NULL;
 290     filter = av_mallocz(sizeof(MpegTSFilter));
 291     if (!filter)
 292         return NULL;
 293     ts->pids[pid] = filter;
 294     filter->type = MPEGTS_SECTION;
 295     filter->pid = pid;
 296     filter->last_cc = -1;
 297     sec = &filter->u.section_filter;
 298     sec->section_cb = section_cb;
 299     sec->opaque = opaque;
 300     sec->section_buf = av_malloc(MAX_SECTION_SIZE);
 301     sec->check_crc = check_crc;
 302     if (!sec->section_buf) {
 303         av_free(filter);
 304         return NULL;
 305     }
 306     return filter;
 307 }
 308
 309 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
 310                                      PESCallback *pes_cb,
 311                                      void *opaque)
 312 {
 313     MpegTSFilter *filter;
 314     MpegTSPESFilter *pes;
 315
 316     if (pid >= NB_PID_MAX || ts->pids[pid])
 317         return NULL;
 318     filter = av_mallocz(sizeof(MpegTSFilter));
 319     if (!filter)
 320         return NULL;
 321     ts->pids[pid] = filter;
 322     filter->type = MPEGTS_PES;
 323     filter->pid = pid;
 324     filter->last_cc = -1;
 325     pes = &filter->u.pes_filter;
 326     pes->pes_cb = pes_cb;
 327     pes->opaque = opaque;
 328     return filter;
 329 }
 330
 331 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
 332 {
 333     int pid;
 334
 335     pid = filter->pid;
 336     if (filter->type == MPEGTS_SECTION)
 337         av_freep(&filter->u.section_filter.section_buf);
 338     else if (filter->type == MPEGTS_PES) {
 339         /* referenced private data will be freed later in
 340          * av_close_input_stream */
 341         if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
 342             av_freep(&filter->u.pes_filter.opaque);
 343         }
 344     }
 345
 346     av_free(filter);
 347     ts->pids[pid] = NULL;
 348 }
 349
 350 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
 351     int stat[packet_size];
 352     int i;
 353     int x=0;
 354     int best_score=0;
 355
 356     memset(stat, 0, packet_size*sizeof(int));
 357
 358     for(x=i=0; i<size-3; i++){
 359         if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
 360             stat[x]++;
 361             if(stat[x] > best_score){
 362                 best_score= stat[x];
 363                 if(index) *index= x;
 364             }
 365         }
 366
 367         x++;
 368         if(x == packet_size) x= 0;
 369     }
 370
 371     return best_score;
 372 }
 373
 374 /* autodetect fec presence. Must have at least 1024 bytes  */
 375 static int get_packet_size(const uint8_t *buf, int size)
 376 {
 377     int score, fec_score, dvhs_score;
 378
 379     if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
 380         return -1;
 381
 382     score    = analyze(buf, size, TS_PACKET_SIZE, NULL);
 383     dvhs_score    = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
 384     fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
 385 //    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
 386
 387     if     (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
 388     else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
 389     else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
 390     else                       return -1;
 391 }
 392
 393 typedef struct SectionHeader {
 394     uint8_t tid;
 395     uint16_t id;
 396     uint8_t version;
 397     uint8_t sec_num;
 398     uint8_t last_sec_num;
 399 } SectionHeader;
 400
 401 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
 402 {
 403     const uint8_t *p;
 404     int c;
 405
 406     p = *pp;
 407     if (p >= p_end)
 408         return -1;
 409     c = *p++;
 410     *pp = p;
 411     return c;
 412 }
 413
 414 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
 415 {
 416     const uint8_t *p;
 417     int c;
 418
 419     p = *pp;
 420     if ((p + 1) >= p_end)
 421         return -1;
 422     c = AV_RB16(p);
 423     p += 2;
 424     *pp = p;
 425     return c;
 426 }
 427
 428 /* read and allocate a DVB string preceeded by its length */
 429 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
 430 {
 431     int len;
 432     const uint8_t *p;
 433     char *str;
 434
 435     p = *pp;
 436     len = get8(&p, p_end);
 437     if (len < 0)
 438         return NULL;
 439     if ((p + len) > p_end)
 440         return NULL;
 441     str = av_malloc(len + 1);
 442     if (!str)
 443         return NULL;
 444     memcpy(str, p, len);
 445     str[len] = '\0';
 446     p += len;
 447     *pp = p;
 448     return str;
 449 }
 450
 451 static int parse_section_header(SectionHeader *h,
 452                                 const uint8_t **pp, const uint8_t *p_end)
 453 {
 454     int val;
 455
 456     val = get8(pp, p_end);
 457     if (val < 0)
 458         return -1;
 459     h->tid = val;
 460     *pp += 2;
 461     val = get16(pp, p_end);
 462     if (val < 0)
 463         return -1;
 464     h->id = val;
 465     val = get8(pp, p_end);
 466     if (val < 0)
 467         return -1;
 468     h->version = (val >> 1) & 0x1f;
 469     val = get8(pp, p_end);
 470     if (val < 0)
 471         return -1;
 472     h->sec_num = val;
 473     val = get8(pp, p_end);
 474     if (val < 0)
 475         return -1;
 476     h->last_sec_num = val;
 477     return 0;
 478 }
 479
 480
 481 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
 482 {
 483     MpegTSContext *ts = filter->u.section_filter.opaque;
 484     SectionHeader h1, *h = &h1;
 485     PESContext *pes;
 486     AVStream *st;
 487     const uint8_t *p, *p_end, *desc_list_end, *desc_end;
 488     int program_info_length, pcr_pid, pid, stream_type;
 489     int desc_list_len, desc_len, desc_tag;
 490     int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
 491     char language[4] = {0}; /* initialize to kill warnings */
 492     int has_hdmv_descr = 0;
 493     int has_dirac_descr = 0;
 494
 495 #ifdef DEBUG_SI
 496     av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
 497     av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
 498 #endif
 499     p_end = section + section_len - 4;
 500     p = section;
 501     if (parse_section_header(h, &p, p_end) < 0)
 502         return;
 503 #ifdef DEBUG_SI
 504     av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",
 505            h->id, h->sec_num, h->last_sec_num);
 506 #endif
 507     if (h->tid != PMT_TID)
 508         return;
 509
 510     clear_program(ts, h->id);
 511     pcr_pid = get16(&p, p_end) & 0x1fff;
 512     if (pcr_pid < 0)
 513         return;
 514     add_pid_to_pmt(ts, h->id, pcr_pid);
 515 #ifdef DEBUG_SI
 516     av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);
 517 #endif
 518     program_info_length = get16(&p, p_end) & 0xfff;
 519     if (program_info_length < 0)
 520         return;
 521     while(program_info_length >= 2) {
 522         uint8_t tag, len;
 523         tag = get8(&p, p_end);
 524         len = get8(&p, p_end);
 525         if(len > program_info_length - 2)
 526             //something else is broken, exit the program_descriptors_loop
 527             break;
 528         program_info_length -= len + 2;
 529         if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
 530             uint8_t bytes[4];
 531             bytes[0] = get8(&p, p_end);
 532             bytes[1] = get8(&p, p_end);
 533             bytes[2] = get8(&p, p_end);
 534             bytes[3] = get8(&p, p_end);
 535             len -= 4;
 536             if(bytes[0] == 'H' && bytes[1] == 'D' &&
 537                bytes[2] == 'M' && bytes[3] == 'V')
 538                 has_hdmv_descr = 1;
 539         }
 540         p += len;
 541     }
 542     p += program_info_length;
 543     if (p >= p_end)
 544         return;
 545     for(;;) {
 546         language[0] = 0;
 547         st = 0;
 548         stream_type = get8(&p, p_end);
 549         if (stream_type < 0)
 550             break;
 551         pid = get16(&p, p_end) & 0x1fff;
 552         if (pid < 0)
 553             break;
 554         desc_list_len = get16(&p, p_end) & 0xfff;
 555         if (desc_list_len < 0)
 556             break;
 557         desc_list_end = p + desc_list_len;
 558         if (desc_list_end > p_end)
 559             break;
 560         for(;;) {
 561             desc_tag = get8(&p, desc_list_end);
 562             if (desc_tag < 0)
 563                 break;
 564             if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
 565                 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
 566                     /*assume DVB AC-3 Audio*/
 567                     stream_type = STREAM_TYPE_AUDIO_AC3;
 568                 } else if(desc_tag == 0x7B) {
 569                     /* DVB DTS audio */
 570                     stream_type = STREAM_TYPE_AUDIO_DTS;
 571                 }
 572             }
 573             desc_len = get8(&p, desc_list_end);
 574             desc_end = p + desc_len;
 575             if (desc_end > desc_list_end)
 576                 break;
 577 #ifdef DEBUG_SI
 578             av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
 579                    desc_tag, desc_len);
 580 #endif
 581             switch(desc_tag) {
 582             case DVB_SUBT_DESCID:
 583                 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
 584                     stream_type = STREAM_TYPE_SUBTITLE_DVB;
 585
 586                 language[0] = get8(&p, desc_end);
 587                 language[1] = get8(&p, desc_end);
 588                 language[2] = get8(&p, desc_end);
 589                 language[3] = 0;
 590                 get8(&p, desc_end);
 591                 comp_page = get16(&p, desc_end);
 592                 anc_page = get16(&p, desc_end);
 593
 594                 break;
 595             case 0x0a: /* ISO 639 language descriptor */
 596                 language[0] = get8(&p, desc_end);
 597                 language[1] = get8(&p, desc_end);
 598                 language[2] = get8(&p, desc_end);
 599                 language[3] = 0;
 600                 break;
 601             case REGISTRATION_DESCRIPTOR: /*MPEG-2 Registration descriptor */
 602                 {
 603                     uint8_t bytes[4];
 604                     bytes[0] = get8(&p, desc_end);
 605                     bytes[1] = get8(&p, desc_end);
 606                     bytes[2] = get8(&p, desc_end);
 607                     bytes[3] = get8(&p, desc_end);
 608                     if(bytes[0] == 'd' && bytes[1] == 'r' &&
 609                        bytes[2] == 'a' && bytes[3] == 'c')
 610                         has_dirac_descr = 1;
 611                     break;
 612                 }
 613             default:
 614                 break;
 615             }
 616             p = desc_end;
 617         }
 618         p = desc_list_end;
 619
 620 #ifdef DEBUG_SI
 621         av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",
 622                stream_type, pid);
 623 #endif
 624
 625         /* now create ffmpeg stream */
 626         switch(stream_type) {
 627         case STREAM_TYPE_AUDIO_MPEG1:
 628         case STREAM_TYPE_AUDIO_MPEG2:
 629         case STREAM_TYPE_VIDEO_MPEG1:
 630         case STREAM_TYPE_VIDEO_MPEG2:
 631         case STREAM_TYPE_VIDEO_MPEG4:
 632         case STREAM_TYPE_VIDEO_H264:
 633         case STREAM_TYPE_VIDEO_VC1:
 634         case STREAM_TYPE_VIDEO_DIRAC:
 635         case STREAM_TYPE_AUDIO_AAC:
 636         case STREAM_TYPE_AUDIO_AC3:
 637         case STREAM_TYPE_AUDIO_DTS:
 638         case STREAM_TYPE_AUDIO_HDMV_DTS:
 639         case STREAM_TYPE_SUBTITLE_DVB:
 640             if((stream_type == STREAM_TYPE_AUDIO_HDMV_DTS && !has_hdmv_descr)
 641             || (stream_type == STREAM_TYPE_VIDEO_DIRAC    && !has_dirac_descr))
 642                 break;
 643             if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
 644                 pes= ts->pids[pid]->u.pes_filter.opaque;
 645                 st= pes->st;
 646             }else{
 647                 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
 648                 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
 649                 if (pes)
 650                     st = new_pes_av_stream(pes, 0);
 651             }
 652             add_pid_to_pmt(ts, h->id, pid);
 653             if(st)
 654                 av_program_add_stream_index(ts->stream, h->id, st->index);
 655             break;
 656         default:
 657             /* we ignore the other streams */
 658             break;
 659         }
 660
 661         if (st) {
 662             if (language[0] != 0) {
 663                 av_metadata_set(&st->metadata, "language", language);
 664             }
 665
 666             if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
 667                 st->codec->sub_id = (anc_page << 16) | comp_page;
 668             }
 669         }
 670     }
 671     /* all parameters are there */
 672     ts->stop_parse++;
 673     mpegts_close_filter(ts, filter);
 674 }
 675
 676 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
 677 {
 678     MpegTSContext *ts = filter->u.section_filter.opaque;
 679     SectionHeader h1, *h = &h1;
 680     const uint8_t *p, *p_end;
 681     int sid, pmt_pid;
 682
 683 #ifdef DEBUG_SI
 684     av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
 685     av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
 686 #endif
 687     p_end = section + section_len - 4;
 688     p = section;
 689     if (parse_section_header(h, &p, p_end) < 0)
 690         return;
 691     if (h->tid != PAT_TID)
 692         return;
 693
 694     clear_programs(ts);
 695     for(;;) {
 696         sid = get16(&p, p_end);
 697         if (sid < 0)
 698             break;
 699         pmt_pid = get16(&p, p_end) & 0x1fff;
 700         if (pmt_pid < 0)
 701             break;
 702 #ifdef DEBUG_SI
 703         av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
 704 #endif
 705         if (sid == 0x0000) {
 706             /* NIT info */
 707         } else {
 708             av_new_program(ts->stream, sid);
 709             ts->stop_parse--;
 710             mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
 711             add_pat_entry(ts, sid);
 712             add_pid_to_pmt(ts, sid, 0); //add pat pid to program
 713             add_pid_to_pmt(ts, sid, pmt_pid);
 714         }
 715     }
 716     /* not found */
 717     ts->stop_parse++;
 718
 719     mpegts_close_filter(ts, filter);
 720 }
 721
 722 static void mpegts_set_service(MpegTSContext *ts)
 723 {
 724     mpegts_open_section_filter(ts, PAT_PID,
 725                                                 pat_cb, ts, 1);
 726 }
 727
 728 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
 729 {
 730     MpegTSContext *ts = filter->u.section_filter.opaque;
 731     SectionHeader h1, *h = &h1;
 732     const uint8_t *p, *p_end, *desc_list_end, *desc_end;
 733     int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
 734     char *name, *provider_name;
 735
 736 #ifdef DEBUG_SI
 737     av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");
 738     av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
 739 #endif
 740
 741     p_end = section + section_len - 4;
 742     p = section;
 743     if (parse_section_header(h, &p, p_end) < 0)
 744         return;
 745     if (h->tid != SDT_TID)
 746         return;
 747     onid = get16(&p, p_end);
 748     if (onid < 0)
 749         return;
 750     val = get8(&p, p_end);
 751     if (val < 0)
 752         return;
 753     for(;;) {
 754         sid = get16(&p, p_end);
 755         if (sid < 0)
 756             break;
 757         val = get8(&p, p_end);
 758         if (val < 0)
 759             break;
 760         desc_list_len = get16(&p, p_end) & 0xfff;
 761         if (desc_list_len < 0)
 762             break;
 763         desc_list_end = p + desc_list_len;
 764         if (desc_list_end > p_end)
 765             break;
 766         for(;;) {
 767             desc_tag = get8(&p, desc_list_end);
 768             if (desc_tag < 0)
 769                 break;
 770             desc_len = get8(&p, desc_list_end);
 771             desc_end = p + desc_len;
 772             if (desc_end > desc_list_end)
 773                 break;
 774 #ifdef DEBUG_SI
 775             av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
 776                    desc_tag, desc_len);
 777 #endif
 778             switch(desc_tag) {
 779             case 0x48:
 780                 service_type = get8(&p, p_end);
 781                 if (service_type < 0)
 782                     break;
 783                 provider_name = getstr8(&p, p_end);
 784                 if (!provider_name)
 785                     break;
 786                 name = getstr8(&p, p_end);
 787                 if (name) {
 788                     AVProgram *program = av_new_program(ts->stream, sid);
 789                     if(program) {
 790                         av_metadata_set(&program->metadata, "name", name);
 791                         av_metadata_set(&program->metadata, "provider_name", provider_name);
 792                     }
 793                 }
 794                 av_free(name);
 795                 av_free(provider_name);
 796                 break;
 797             default:
 798                 break;
 799             }
 800             p = desc_end;
 801         }
 802         p = desc_list_end;
 803     }
 804 }
 805
 806 /* scan services in a transport stream by looking at the SDT */
 807 static void mpegts_scan_sdt(MpegTSContext *ts)
 808 {
 809     mpegts_open_section_filter(ts, SDT_PID,
 810                                                 sdt_cb, ts, 1);
 811 }
 812
 813 static int64_t get_pts(const uint8_t *p)
 814 {
 815     int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
 816     pts |= (AV_RB16(p + 1) >> 1) << 15;
 817     pts |=  AV_RB16(p + 3) >> 1;
 818     return pts;
 819 }
 820
 821 /* return non zero if a packet could be constructed */
 822 static void mpegts_push_data(MpegTSFilter *filter,
 823                              const uint8_t *buf, int buf_size, int is_start,
 824                              int64_t pos)
 825 {
 826     PESContext *pes = filter->u.pes_filter.opaque;
 827     MpegTSContext *ts = pes->ts;
 828     const uint8_t *p;
 829     int len, code;
 830
 831     if(!ts->pkt)
 832         return;
 833
 834     if (is_start) {
 835         pes->state = MPEGTS_HEADER;
 836         pes->data_index = 0;
 837         pes->ts_packet_pos = pos;
 838     }
 839     p = buf;
 840     while (buf_size > 0) {
 841         switch(pes->state) {
 842         case MPEGTS_HEADER:
 843             len = PES_START_SIZE - pes->data_index;
 844             if (len > buf_size)
 845                 len = buf_size;
 846             memcpy(pes->header + pes->data_index, p, len);
 847             pes->data_index += len;
 848             p += len;
 849             buf_size -= len;
 850             if (pes->data_index == PES_START_SIZE) {
 851                 /* we got all the PES or section header. We can now
 852                    decide */
 853 #if 0
 854                 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
 855 #endif
 856                 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
 857                     pes->header[2] == 0x01) {
 858                     /* it must be an mpeg2 PES stream */
 859                     code = pes->header[3] | 0x100;
 860                     if (!pes->st ||
 861                         !((code >= 0x1c0 && code <= 0x1df) ||
 862                           (code >= 0x1e0 && code <= 0x1ef) ||
 863                           (code == 0x1bd) || (code == 0x1fd)))
 864                         goto skip;
 865                     pes->state = MPEGTS_PESHEADER_FILL;
 866                     pes->total_size = AV_RB16(pes->header + 4);
 867                     /* NOTE: a zero total size means the PES size is
 868                        unbounded */
 869                     if (pes->total_size)
 870                         pes->total_size += 6;
 871                     pes->pes_header_size = pes->header[8] + 9;
 872                 } else {
 873                     /* otherwise, it should be a table */
 874                     /* skip packet */
 875                 skip:
 876                     pes->state = MPEGTS_SKIP;
 877                     continue;
 878                 }
 879             }
 880             break;
 881             /**********************************************/
 882             /* PES packing parsing */
 883         case MPEGTS_PESHEADER_FILL:
 884             len = pes->pes_header_size - pes->data_index;
 885             if (len > buf_size)
 886                 len = buf_size;
 887             memcpy(pes->header + pes->data_index, p, len);
 888             pes->data_index += len;
 889             p += len;
 890             buf_size -= len;
 891             if (pes->data_index == pes->pes_header_size) {
 892                 const uint8_t *r;
 893                 unsigned int flags;
 894
 895                 flags = pes->header[7];
 896                 r = pes->header + 9;
 897                 pes->pts = AV_NOPTS_VALUE;
 898                 pes->dts = AV_NOPTS_VALUE;
 899                 if ((flags & 0xc0) == 0x80) {
 900                     pes->dts = pes->pts = get_pts(r);
 901                     r += 5;
 902                 } else if ((flags & 0xc0) == 0xc0) {
 903                     pes->pts = get_pts(r);
 904                     r += 5;
 905                     pes->dts = get_pts(r);
 906                     r += 5;
 907                 }
 908                 /* we got the full header. We parse it and get the payload */
 909                 pes->state = MPEGTS_PAYLOAD;
 910             }
 911             break;
 912         case MPEGTS_PAYLOAD:
 913             if (pes->total_size) {
 914                 len = pes->total_size - pes->data_index;
 915                 if (len > buf_size)
 916                     len = buf_size;
 917             } else {
 918                 len = buf_size;
 919             }
 920             if (len > 0) {
 921                 AVPacket *pkt = ts->pkt;
 922                 if (pes->st && av_new_packet(pkt, len) == 0) {
 923                     memcpy(pkt->data, p, len);
 924                     pkt->stream_index = pes->st->index;
 925                     pkt->pts = pes->pts;
 926                     pkt->dts = pes->dts;
 927                     /* store position of first TS packet of this PES packet */
 928                     pkt->pos = pes->ts_packet_pos;
 929                     /* reset pts values */
 930                     pes->pts = AV_NOPTS_VALUE;
 931                     pes->dts = AV_NOPTS_VALUE;
 932                     ts->stop_parse = 1;
 933                     return;
 934                 }
 935             }
 936             buf_size = 0;
 937             break;
 938         case MPEGTS_SKIP:
 939             buf_size = 0;
 940             break;
 941         }
 942     }
 943 }
 944
 945 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
 946 {
 947     AVStream *st;
 948     enum CodecID codec_id;
 949     enum CodecType codec_type;
 950
 951     switch(pes->stream_type){
 952     case STREAM_TYPE_AUDIO_MPEG1:
 953     case STREAM_TYPE_AUDIO_MPEG2:
 954         codec_type = CODEC_TYPE_AUDIO;
 955         codec_id = CODEC_ID_MP3;
 956         break;
 957     case STREAM_TYPE_VIDEO_MPEG1:
 958     case STREAM_TYPE_VIDEO_MPEG2:
 959         codec_type = CODEC_TYPE_VIDEO;
 960         codec_id = CODEC_ID_MPEG2VIDEO;
 961         break;
 962     case STREAM_TYPE_VIDEO_MPEG4:
 963         codec_type = CODEC_TYPE_VIDEO;
 964         codec_id = CODEC_ID_MPEG4;
 965         break;
 966     case STREAM_TYPE_VIDEO_H264:
 967         codec_type = CODEC_TYPE_VIDEO;
 968         codec_id = CODEC_ID_H264;
 969         break;
 970     case STREAM_TYPE_VIDEO_VC1:
 971         codec_type = CODEC_TYPE_VIDEO;
 972         codec_id = CODEC_ID_VC1;
 973         break;
 974     case STREAM_TYPE_VIDEO_DIRAC:
 975         codec_type = CODEC_TYPE_VIDEO;
 976         codec_id = CODEC_ID_DIRAC;
 977         break;
 978     case STREAM_TYPE_AUDIO_AAC:
 979         codec_type = CODEC_TYPE_AUDIO;
 980         codec_id = CODEC_ID_AAC;
 981         break;
 982     case STREAM_TYPE_AUDIO_AC3:
 983         codec_type = CODEC_TYPE_AUDIO;
 984         codec_id = CODEC_ID_AC3;
 985         break;
 986     case STREAM_TYPE_AUDIO_DTS:
 987     case STREAM_TYPE_AUDIO_HDMV_DTS:
 988         codec_type = CODEC_TYPE_AUDIO;
 989         codec_id = CODEC_ID_DTS;
 990         break;
 991     case STREAM_TYPE_SUBTITLE_DVB:
 992         codec_type = CODEC_TYPE_SUBTITLE;
 993         codec_id = CODEC_ID_DVB_SUBTITLE;
 994         break;
 995     default:
 996         if (code >= 0x1c0 && code <= 0x1df) {
 997             codec_type = CODEC_TYPE_AUDIO;
 998             codec_id = CODEC_ID_MP2;
 999         } else if (code == 0x1bd) {
1000             codec_type = CODEC_TYPE_AUDIO;
1001             codec_id = CODEC_ID_AC3;
1002         } else {
1003             codec_type = CODEC_TYPE_VIDEO;
1004             codec_id = CODEC_ID_PROBE;
1005         }
1006         break;
1007     }
1008     st = av_new_stream(pes->stream, pes->pid);
1009     if (st) {
1010         av_set_pts_info(st, 33, 1, 90000);
1011         st->priv_data = pes;
1012         st->codec->codec_type = codec_type;
1013         st->codec->codec_id = codec_id;
1014         st->need_parsing = AVSTREAM_PARSE_FULL;
1015         pes->st = st;
1016     }
1017     return st;
1018 }
1019
1020
1021 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1022 {
1023     MpegTSFilter *tss;
1024     PESContext *pes;
1025
1026     /* if no pid found, then add a pid context */
1027     pes = av_mallocz(sizeof(PESContext));
1028     if (!pes)
1029         return 0;
1030     pes->ts = ts;
1031     pes->stream = ts->stream;
1032     pes->pid = pid;
1033     pes->pcr_pid = pcr_pid;
1034     pes->stream_type = stream_type;
1035     tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1036     if (!tss) {
1037         av_free(pes);
1038         return 0;
1039     }
1040     return pes;
1041 }
1042
1043 /* handle one TS packet */
1044 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
1045 {
1046     AVFormatContext *s = ts->stream;
1047     MpegTSFilter *tss;
1048     int len, pid, cc, cc_ok, afc, is_start;
1049     const uint8_t *p, *p_end;
1050     int64_t pos;
1051
1052     pid = AV_RB16(packet + 1) & 0x1fff;
1053     if(pid && discard_pid(ts, pid))
1054         return;
1055     is_start = packet[1] & 0x40;
1056     tss = ts->pids[pid];
1057     if (ts->auto_guess && tss == NULL && is_start) {
1058         add_pes_stream(ts, pid, -1, 0);
1059         tss = ts->pids[pid];
1060     }
1061     if (!tss)
1062         return;
1063
1064     /* continuity check (currently not used) */
1065     cc = (packet[3] & 0xf);
1066     cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1067     tss->last_cc = cc;
1068
1069     /* skip adaptation field */
1070     afc = (packet[3] >> 4) & 3;
1071     p = packet + 4;
1072     if (afc == 0) /* reserved value */
1073         return;
1074     if (afc == 2) /* adaptation field only */
1075         return;
1076     if (afc == 3) {
1077         /* skip adapation field */
1078         p += p[0] + 1;
1079     }
1080     /* if past the end of packet, ignore */
1081     p_end = packet + TS_PACKET_SIZE;
1082     if (p >= p_end)
1083         return;
1084
1085     pos = url_ftell(ts->stream->pb);
1086     ts->pos47= pos % ts->raw_packet_size;
1087
1088     if (tss->type == MPEGTS_SECTION) {
1089         if (is_start) {
1090             /* pointer field present */
1091             len = *p++;
1092             if (p + len > p_end)
1093                 return;
1094             if (len && cc_ok) {
1095                 /* write remaining section bytes */
1096                 write_section_data(s, tss,
1097                                    p, len, 0);
1098                 /* check whether filter has been closed */
1099                 if (!ts->pids[pid])
1100                     return;
1101             }
1102             p += len;
1103             if (p < p_end) {
1104                 write_section_data(s, tss,
1105                                    p, p_end - p, 1);
1106             }
1107         } else {
1108             if (cc_ok) {
1109                 write_section_data(s, tss,
1110                                    p, p_end - p, 0);
1111             }
1112         }
1113     } else {
1114         // Note: The position here points actually behind the current packet.
1115         tss->u.pes_filter.pes_cb(tss,
1116                                  p, p_end - p, is_start, pos - ts->raw_packet_size);
1117     }
1118 }
1119
1120 /* XXX: try to find a better synchro over several packets (use
1121    get_packet_size() ?) */
1122 static int mpegts_resync(ByteIOContext *pb)
1123 {
1124     int c, i;
1125
1126     for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1127         c = url_fgetc(pb);
1128         if (c < 0)
1129             return -1;
1130         if (c == 0x47) {
1131             url_fseek(pb, -1, SEEK_CUR);
1132             return 0;
1133         }
1134     }
1135     /* no sync found */
1136     return -1;
1137 }
1138
1139 /* return -1 if error or EOF. Return 0 if OK. */
1140 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1141 {
1142     int skip, len;
1143
1144     for(;;) {
1145         len = get_buffer(pb, buf, TS_PACKET_SIZE);
1146         if (len != TS_PACKET_SIZE)
1147             return AVERROR(EIO);
1148         /* check paquet sync byte */
1149         if (buf[0] != 0x47) {
1150             /* find a new packet start */
1151             url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1152             if (mpegts_resync(pb) < 0)
1153                 return AVERROR_INVALIDDATA;
1154             else
1155                 continue;
1156         } else {
1157             skip = raw_packet_size - TS_PACKET_SIZE;
1158             if (skip > 0)
1159                 url_fskip(pb, skip);
1160             break;
1161         }
1162     }
1163     return 0;
1164 }
1165
1166 static int handle_packets(MpegTSContext *ts, int nb_packets)
1167 {
1168     AVFormatContext *s = ts->stream;
1169     ByteIOContext *pb = s->pb;
1170     uint8_t packet[TS_PACKET_SIZE];
1171     int packet_num, ret;
1172
1173     ts->stop_parse = 0;
1174     packet_num = 0;
1175     for(;;) {
1176         if (ts->stop_parse>0)
1177             break;
1178         packet_num++;
1179         if (nb_packets != 0 && packet_num >= nb_packets)
1180             break;
1181         ret = read_packet(pb, packet, ts->raw_packet_size);
1182         if (ret != 0)
1183             return ret;
1184         handle_packet(ts, packet);
1185     }
1186     return 0;
1187 }
1188
1189 static int mpegts_probe(AVProbeData *p)
1190 {
1191 #if 1
1192     const int size= p->buf_size;
1193     int score, fec_score, dvhs_score;
1194     int check_count= size / TS_FEC_PACKET_SIZE;
1195 #define CHECK_COUNT 10
1196
1197     if (check_count < CHECK_COUNT)
1198         return -1;
1199
1200     score     = analyze(p->buf, TS_PACKET_SIZE     *check_count, TS_PACKET_SIZE     , NULL)*CHECK_COUNT/check_count;
1201     dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1202     fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1203 //    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1204
1205 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1206     if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;
1207     else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;
1208     else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1209     else                                    return -1;
1210 #else
1211     /* only use the extension for safer guess */
1212     if (match_ext(p->filename, "ts"))
1213         return AVPROBE_SCORE_MAX;
1214     else
1215         return 0;
1216 #endif
1217 }
1218
1219 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1220    (-1) if not available */
1221 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1222                      const uint8_t *packet)
1223 {
1224     int afc, len, flags;
1225     const uint8_t *p;
1226     unsigned int v;
1227
1228     afc = (packet[3] >> 4) & 3;
1229     if (afc <= 1)
1230         return -1;
1231     p = packet + 4;
1232     len = p[0];
1233     p++;
1234     if (len == 0)
1235         return -1;
1236     flags = *p++;
1237     len--;
1238     if (!(flags & 0x10))
1239         return -1;
1240     if (len < 6)
1241         return -1;
1242     v = AV_RB32(p);
1243     *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1244     *ppcr_low = ((p[4] & 1) << 8) | p[5];
1245     return 0;
1246 }
1247
1248 static int mpegts_read_header(AVFormatContext *s,
1249                               AVFormatParameters *ap)
1250 {
1251     MpegTSContext *ts = s->priv_data;
1252     ByteIOContext *pb = s->pb;
1253     uint8_t buf[5*1024];
1254     int len;
1255     int64_t pos;
1256
1257     if (ap) {
1258         ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1259         if(ap->mpeg2ts_raw){
1260             av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1261             return -1;
1262         }
1263     }
1264
1265     /* read the first 1024 bytes to get packet size */
1266     pos = url_ftell(pb);
1267     len = get_buffer(pb, buf, sizeof(buf));
1268     if (len != sizeof(buf))
1269         goto fail;
1270     ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1271     if (ts->raw_packet_size <= 0)
1272         goto fail;
1273     ts->stream = s;
1274     ts->auto_guess = 0;
1275
1276     if (s->iformat == &mpegts_demuxer) {
1277         /* normal demux */
1278
1279         /* first do a scaning to get all the services */
1280         url_fseek(pb, pos, SEEK_SET);
1281         mpegts_scan_sdt(ts);
1282
1283         mpegts_set_service(ts);
1284
1285         handle_packets(ts, s->probesize);
1286         /* if could not find service, enable auto_guess */
1287
1288         ts->auto_guess = 1;
1289
1290 #ifdef DEBUG_SI
1291         av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");
1292 #endif
1293         s->ctx_flags |= AVFMTCTX_NOHEADER;
1294     } else {
1295         AVStream *st;
1296         int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1297         int64_t pcrs[2], pcr_h;
1298         int packet_count[2];
1299         uint8_t packet[TS_PACKET_SIZE];
1300
1301         /* only read packets */
1302
1303         st = av_new_stream(s, 0);
1304         if (!st)
1305             goto fail;
1306         av_set_pts_info(st, 60, 1, 27000000);
1307         st->codec->codec_type = CODEC_TYPE_DATA;
1308         st->codec->codec_id = CODEC_ID_MPEG2TS;
1309
1310         /* we iterate until we find two PCRs to estimate the bitrate */
1311         pcr_pid = -1;
1312         nb_pcrs = 0;
1313         nb_packets = 0;
1314         for(;;) {
1315             ret = read_packet(s->pb, packet, ts->raw_packet_size);
1316             if (ret < 0)
1317                 return -1;
1318             pid = AV_RB16(packet + 1) & 0x1fff;
1319             if ((pcr_pid == -1 || pcr_pid == pid) &&
1320                 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1321                 pcr_pid = pid;
1322                 packet_count[nb_pcrs] = nb_packets;
1323                 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1324                 nb_pcrs++;
1325                 if (nb_pcrs >= 2)
1326                     break;
1327             }
1328             nb_packets++;
1329         }
1330
1331         /* NOTE1: the bitrate is computed without the FEC */
1332         /* NOTE2: it is only the bitrate of the start of the stream */
1333         ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1334         ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1335         s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1336         st->codec->bit_rate = s->bit_rate;
1337         st->start_time = ts->cur_pcr;
1338 #if 0
1339         av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1340                st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1341 #endif
1342     }
1343
1344     url_fseek(pb, pos, SEEK_SET);
1345     return 0;
1346  fail:
1347     return -1;
1348 }
1349
1350 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1351
1352 static int mpegts_raw_read_packet(AVFormatContext *s,
1353                                   AVPacket *pkt)
1354 {
1355     MpegTSContext *ts = s->priv_data;
1356     int ret, i;
1357     int64_t pcr_h, next_pcr_h, pos;
1358     int pcr_l, next_pcr_l;
1359     uint8_t pcr_buf[12];
1360
1361     if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1362         return AVERROR(ENOMEM);
1363     pkt->pos= url_ftell(s->pb);
1364     ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1365     if (ret < 0) {
1366         av_free_packet(pkt);
1367         return ret;
1368     }
1369     if (ts->mpeg2ts_compute_pcr) {
1370         /* compute exact PCR for each packet */
1371         if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1372             /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1373             pos = url_ftell(s->pb);
1374             for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1375                 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1376                 get_buffer(s->pb, pcr_buf, 12);
1377                 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1378                     /* XXX: not precise enough */
1379                     ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1380                         (i + 1);
1381                     break;
1382                 }
1383             }
1384             url_fseek(s->pb, pos, SEEK_SET);
1385             /* no next PCR found: we use previous increment */
1386             ts->cur_pcr = pcr_h * 300 + pcr_l;
1387         }
1388         pkt->pts = ts->cur_pcr;
1389         pkt->duration = ts->pcr_incr;
1390         ts->cur_pcr += ts->pcr_incr;
1391     }
1392     pkt->stream_index = 0;
1393     return 0;
1394 }
1395
1396 static int mpegts_read_packet(AVFormatContext *s,
1397                               AVPacket *pkt)
1398 {
1399     MpegTSContext *ts = s->priv_data;
1400
1401     ts->pkt = pkt;
1402     return handle_packets(ts, 0);
1403 }
1404
1405 static int mpegts_read_close(AVFormatContext *s)
1406 {
1407     MpegTSContext *ts = s->priv_data;
1408     int i;
1409
1410     clear_programs(ts);
1411
1412     for(i=0;i<NB_PID_MAX;i++)
1413         if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1414
1415     return 0;
1416 }
1417
1418 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1419                               int64_t *ppos, int64_t pos_limit)
1420 {
1421     MpegTSContext *ts = s->priv_data;
1422     int64_t pos, timestamp;
1423     uint8_t buf[TS_PACKET_SIZE];
1424     int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1425     const int find_next= 1;
1426     pos = ((*ppos  + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1427     if (find_next) {
1428         for(;;) {
1429             url_fseek(s->pb, pos, SEEK_SET);
1430             if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1431                 return AV_NOPTS_VALUE;
1432             if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1433                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1434                 break;
1435             }
1436             pos += ts->raw_packet_size;
1437         }
1438     } else {
1439         for(;;) {
1440             pos -= ts->raw_packet_size;
1441             if (pos < 0)
1442                 return AV_NOPTS_VALUE;
1443             url_fseek(s->pb, pos, SEEK_SET);
1444             if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1445                 return AV_NOPTS_VALUE;
1446             if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1447                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1448                 break;
1449             }
1450         }
1451     }
1452     *ppos = pos;
1453
1454     return timestamp;
1455 }
1456
1457 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1458     MpegTSContext *ts = s->priv_data;
1459     uint8_t buf[TS_PACKET_SIZE];
1460     int64_t pos;
1461
1462     if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1463         return -1;
1464
1465     pos= url_ftell(s->pb);
1466
1467     for(;;) {
1468         url_fseek(s->pb, pos, SEEK_SET);
1469         if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1470             return -1;
1471 //        pid = AV_RB16(buf + 1) & 0x1fff;
1472         if(buf[1] & 0x40) break;
1473         pos += ts->raw_packet_size;
1474     }
1475     url_fseek(s->pb, pos, SEEK_SET);
1476
1477     return 0;
1478 }
1479
1480 /**************************************************************/
1481 /* parsing functions - called from other demuxers such as RTP */
1482
1483 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1484 {
1485     MpegTSContext *ts;
1486
1487     ts = av_mallocz(sizeof(MpegTSContext));
1488     if (!ts)
1489         return NULL;
1490     /* no stream case, currently used by RTP */
1491     ts->raw_packet_size = TS_PACKET_SIZE;
1492     ts->stream = s;
1493     ts->auto_guess = 1;
1494     return ts;
1495 }
1496
1497 /* return the consumed length if a packet was output, or -1 if no
1498    packet is output */
1499 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1500                         const uint8_t *buf, int len)
1501 {
1502     int len1;
1503
1504     len1 = len;
1505     ts->pkt = pkt;
1506     ts->stop_parse = 0;
1507     for(;;) {
1508         if (ts->stop_parse>0)
1509             break;
1510         if (len < TS_PACKET_SIZE)
1511             return -1;
1512         if (buf[0] != 0x47) {
1513             buf++;
1514             len--;
1515         } else {
1516             handle_packet(ts, buf);
1517             buf += TS_PACKET_SIZE;
1518             len -= TS_PACKET_SIZE;
1519         }
1520     }
1521     return len1 - len;
1522 }
1523
1524 void mpegts_parse_close(MpegTSContext *ts)
1525 {
1526     int i;
1527
1528     for(i=0;i<NB_PID_MAX;i++)
1529         av_free(ts->pids[i]);
1530     av_free(ts);
1531 }
1532
1533 AVInputFormat mpegts_demuxer = {
1534     "mpegts",
1535     NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1536     sizeof(MpegTSContext),
1537     mpegts_probe,
1538     mpegts_read_header,
1539     mpegts_read_packet,
1540     mpegts_read_close,
1541     read_seek,
1542     mpegts_get_pcr,
1543     .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1544 };
1545
1546 AVInputFormat mpegtsraw_demuxer = {
1547     "mpegtsraw",
1548     NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1549     sizeof(MpegTSContext),
1550     NULL,
1551     mpegts_read_header,
1552     mpegts_raw_read_packet,
1553     mpegts_read_close,
1554     read_seek,
1555     mpegts_get_pcr,
1556     .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1557 };