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 (!((code >= 0x1c0 && code <= 0x1df) ||
 861                           (code >= 0x1e0 && code <= 0x1ef) ||
 862                           (code == 0x1bd) || (code == 0x1fd)))
 863                         goto skip;
 864                     if (!pes->st) {
 865                         /* allocate stream */
 866                         new_pes_av_stream(pes, code);
 867                     }
 868                     pes->state = MPEGTS_PESHEADER_FILL;
 869                     pes->total_size = AV_RB16(pes->header + 4);
 870                     /* NOTE: a zero total size means the PES size is
 871                        unbounded */
 872                     if (pes->total_size)
 873                         pes->total_size += 6;
 874                     pes->pes_header_size = pes->header[8] + 9;
 875                 } else {
 876                     /* otherwise, it should be a table */
 877                     /* skip packet */
 878                 skip:
 879                     pes->state = MPEGTS_SKIP;
 880                     continue;
 881                 }
 882             }
 883             break;
 884             /**********************************************/
 885             /* PES packing parsing */
 886         case MPEGTS_PESHEADER_FILL:
 887             len = pes->pes_header_size - pes->data_index;
 888             if (len > buf_size)
 889                 len = buf_size;
 890             memcpy(pes->header + pes->data_index, p, len);
 891             pes->data_index += len;
 892             p += len;
 893             buf_size -= len;
 894             if (pes->data_index == pes->pes_header_size) {
 895                 const uint8_t *r;
 896                 unsigned int flags;
 897
 898                 flags = pes->header[7];
 899                 r = pes->header + 9;
 900                 pes->pts = AV_NOPTS_VALUE;
 901                 pes->dts = AV_NOPTS_VALUE;
 902                 if ((flags & 0xc0) == 0x80) {
 903                     pes->dts = pes->pts = get_pts(r);
 904                     r += 5;
 905                 } else if ((flags & 0xc0) == 0xc0) {
 906                     pes->pts = get_pts(r);
 907                     r += 5;
 908                     pes->dts = get_pts(r);
 909                     r += 5;
 910                 }
 911                 /* we got the full header. We parse it and get the payload */
 912                 pes->state = MPEGTS_PAYLOAD;
 913             }
 914             break;
 915         case MPEGTS_PAYLOAD:
 916             if (pes->total_size) {
 917                 len = pes->total_size - pes->data_index;
 918                 if (len > buf_size)
 919                     len = buf_size;
 920             } else {
 921                 len = buf_size;
 922             }
 923             if (len > 0) {
 924                 AVPacket *pkt = ts->pkt;
 925                 if (pes->st && av_new_packet(pkt, len) == 0) {
 926                     memcpy(pkt->data, p, len);
 927                     pkt->stream_index = pes->st->index;
 928                     pkt->pts = pes->pts;
 929                     pkt->dts = pes->dts;
 930                     /* store position of first TS packet of this PES packet */
 931                     pkt->pos = pes->ts_packet_pos;
 932                     /* reset pts values */
 933                     pes->pts = AV_NOPTS_VALUE;
 934                     pes->dts = AV_NOPTS_VALUE;
 935                     ts->stop_parse = 1;
 936                     return;
 937                 }
 938             }
 939             buf_size = 0;
 940             break;
 941         case MPEGTS_SKIP:
 942             buf_size = 0;
 943             break;
 944         }
 945     }
 946 }
 947
 948 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
 949 {
 950     AVStream *st;
 951     enum CodecID codec_id;
 952     enum CodecType codec_type;
 953
 954     switch(pes->stream_type){
 955     case STREAM_TYPE_AUDIO_MPEG1:
 956     case STREAM_TYPE_AUDIO_MPEG2:
 957         codec_type = CODEC_TYPE_AUDIO;
 958         codec_id = CODEC_ID_MP3;
 959         break;
 960     case STREAM_TYPE_VIDEO_MPEG1:
 961     case STREAM_TYPE_VIDEO_MPEG2:
 962         codec_type = CODEC_TYPE_VIDEO;
 963         codec_id = CODEC_ID_MPEG2VIDEO;
 964         break;
 965     case STREAM_TYPE_VIDEO_MPEG4:
 966         codec_type = CODEC_TYPE_VIDEO;
 967         codec_id = CODEC_ID_MPEG4;
 968         break;
 969     case STREAM_TYPE_VIDEO_H264:
 970         codec_type = CODEC_TYPE_VIDEO;
 971         codec_id = CODEC_ID_H264;
 972         break;
 973     case STREAM_TYPE_VIDEO_VC1:
 974         codec_type = CODEC_TYPE_VIDEO;
 975         codec_id = CODEC_ID_VC1;
 976         break;
 977     case STREAM_TYPE_VIDEO_DIRAC:
 978         codec_type = CODEC_TYPE_VIDEO;
 979         codec_id = CODEC_ID_DIRAC;
 980         break;
 981     case STREAM_TYPE_AUDIO_AAC:
 982         codec_type = CODEC_TYPE_AUDIO;
 983         codec_id = CODEC_ID_AAC;
 984         break;
 985     case STREAM_TYPE_AUDIO_AC3:
 986         codec_type = CODEC_TYPE_AUDIO;
 987         codec_id = CODEC_ID_AC3;
 988         break;
 989     case STREAM_TYPE_AUDIO_DTS:
 990     case STREAM_TYPE_AUDIO_HDMV_DTS:
 991         codec_type = CODEC_TYPE_AUDIO;
 992         codec_id = CODEC_ID_DTS;
 993         break;
 994     case STREAM_TYPE_SUBTITLE_DVB:
 995         codec_type = CODEC_TYPE_SUBTITLE;
 996         codec_id = CODEC_ID_DVB_SUBTITLE;
 997         break;
 998     default:
 999         if (code >= 0x1c0 && code <= 0x1df) {
1000             codec_type = CODEC_TYPE_AUDIO;
1001             codec_id = CODEC_ID_MP2;
1002         } else if (code == 0x1bd) {
1003             codec_type = CODEC_TYPE_AUDIO;
1004             codec_id = CODEC_ID_AC3;
1005         } else {
1006             codec_type = CODEC_TYPE_VIDEO;
1007             codec_id = CODEC_ID_PROBE;
1008         }
1009         break;
1010     }
1011     st = av_new_stream(pes->stream, pes->pid);
1012     if (st) {
1013         av_set_pts_info(st, 33, 1, 90000);
1014         st->priv_data = pes;
1015         st->codec->codec_type = codec_type;
1016         st->codec->codec_id = codec_id;
1017         st->need_parsing = AVSTREAM_PARSE_FULL;
1018         pes->st = st;
1019     }
1020     return st;
1021 }
1022
1023
1024 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1025 {
1026     MpegTSFilter *tss;
1027     PESContext *pes;
1028
1029     /* if no pid found, then add a pid context */
1030     pes = av_mallocz(sizeof(PESContext));
1031     if (!pes)
1032         return 0;
1033     pes->ts = ts;
1034     pes->stream = ts->stream;
1035     pes->pid = pid;
1036     pes->pcr_pid = pcr_pid;
1037     pes->stream_type = stream_type;
1038     tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1039     if (!tss) {
1040         av_free(pes);
1041         return 0;
1042     }
1043     return pes;
1044 }
1045
1046 /* handle one TS packet */
1047 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
1048 {
1049     AVFormatContext *s = ts->stream;
1050     MpegTSFilter *tss;
1051     int len, pid, cc, cc_ok, afc, is_start;
1052     const uint8_t *p, *p_end;
1053     int64_t pos;
1054
1055     pid = AV_RB16(packet + 1) & 0x1fff;
1056     if(pid && discard_pid(ts, pid))
1057         return;
1058     is_start = packet[1] & 0x40;
1059     tss = ts->pids[pid];
1060     if (ts->auto_guess && tss == NULL && is_start) {
1061         add_pes_stream(ts, pid, -1, 0);
1062         tss = ts->pids[pid];
1063     }
1064     if (!tss)
1065         return;
1066
1067     /* continuity check (currently not used) */
1068     cc = (packet[3] & 0xf);
1069     cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1070     tss->last_cc = cc;
1071
1072     /* skip adaptation field */
1073     afc = (packet[3] >> 4) & 3;
1074     p = packet + 4;
1075     if (afc == 0) /* reserved value */
1076         return;
1077     if (afc == 2) /* adaptation field only */
1078         return;
1079     if (afc == 3) {
1080         /* skip adapation field */
1081         p += p[0] + 1;
1082     }
1083     /* if past the end of packet, ignore */
1084     p_end = packet + TS_PACKET_SIZE;
1085     if (p >= p_end)
1086         return;
1087
1088     pos = url_ftell(ts->stream->pb);
1089     ts->pos47= pos % ts->raw_packet_size;
1090
1091     if (tss->type == MPEGTS_SECTION) {
1092         if (is_start) {
1093             /* pointer field present */
1094             len = *p++;
1095             if (p + len > p_end)
1096                 return;
1097             if (len && cc_ok) {
1098                 /* write remaining section bytes */
1099                 write_section_data(s, tss,
1100                                    p, len, 0);
1101                 /* check whether filter has been closed */
1102                 if (!ts->pids[pid])
1103                     return;
1104             }
1105             p += len;
1106             if (p < p_end) {
1107                 write_section_data(s, tss,
1108                                    p, p_end - p, 1);
1109             }
1110         } else {
1111             if (cc_ok) {
1112                 write_section_data(s, tss,
1113                                    p, p_end - p, 0);
1114             }
1115         }
1116     } else {
1117         // Note: The position here points actually behind the current packet.
1118         tss->u.pes_filter.pes_cb(tss,
1119                                  p, p_end - p, is_start, pos - ts->raw_packet_size);
1120     }
1121 }
1122
1123 /* XXX: try to find a better synchro over several packets (use
1124    get_packet_size() ?) */
1125 static int mpegts_resync(ByteIOContext *pb)
1126 {
1127     int c, i;
1128
1129     for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1130         c = url_fgetc(pb);
1131         if (c < 0)
1132             return -1;
1133         if (c == 0x47) {
1134             url_fseek(pb, -1, SEEK_CUR);
1135             return 0;
1136         }
1137     }
1138     /* no sync found */
1139     return -1;
1140 }
1141
1142 /* return -1 if error or EOF. Return 0 if OK. */
1143 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1144 {
1145     int skip, len;
1146
1147     for(;;) {
1148         len = get_buffer(pb, buf, TS_PACKET_SIZE);
1149         if (len != TS_PACKET_SIZE)
1150             return AVERROR(EIO);
1151         /* check paquet sync byte */
1152         if (buf[0] != 0x47) {
1153             /* find a new packet start */
1154             url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1155             if (mpegts_resync(pb) < 0)
1156                 return AVERROR_INVALIDDATA;
1157             else
1158                 continue;
1159         } else {
1160             skip = raw_packet_size - TS_PACKET_SIZE;
1161             if (skip > 0)
1162                 url_fskip(pb, skip);
1163             break;
1164         }
1165     }
1166     return 0;
1167 }
1168
1169 static int handle_packets(MpegTSContext *ts, int nb_packets)
1170 {
1171     AVFormatContext *s = ts->stream;
1172     ByteIOContext *pb = s->pb;
1173     uint8_t packet[TS_PACKET_SIZE];
1174     int packet_num, ret;
1175
1176     ts->stop_parse = 0;
1177     packet_num = 0;
1178     for(;;) {
1179         if (ts->stop_parse>0)
1180             break;
1181         packet_num++;
1182         if (nb_packets != 0 && packet_num >= nb_packets)
1183             break;
1184         ret = read_packet(pb, packet, ts->raw_packet_size);
1185         if (ret != 0)
1186             return ret;
1187         handle_packet(ts, packet);
1188     }
1189     return 0;
1190 }
1191
1192 static int mpegts_probe(AVProbeData *p)
1193 {
1194 #if 1
1195     const int size= p->buf_size;
1196     int score, fec_score, dvhs_score;
1197     int check_count= size / TS_FEC_PACKET_SIZE;
1198 #define CHECK_COUNT 10
1199
1200     if (check_count < CHECK_COUNT)
1201         return -1;
1202
1203     score     = analyze(p->buf, TS_PACKET_SIZE     *check_count, TS_PACKET_SIZE     , NULL)*CHECK_COUNT/check_count;
1204     dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1205     fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1206 //    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1207
1208 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1209     if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;
1210     else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;
1211     else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1212     else                                    return -1;
1213 #else
1214     /* only use the extension for safer guess */
1215     if (match_ext(p->filename, "ts"))
1216         return AVPROBE_SCORE_MAX;
1217     else
1218         return 0;
1219 #endif
1220 }
1221
1222 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1223    (-1) if not available */
1224 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1225                      const uint8_t *packet)
1226 {
1227     int afc, len, flags;
1228     const uint8_t *p;
1229     unsigned int v;
1230
1231     afc = (packet[3] >> 4) & 3;
1232     if (afc <= 1)
1233         return -1;
1234     p = packet + 4;
1235     len = p[0];
1236     p++;
1237     if (len == 0)
1238         return -1;
1239     flags = *p++;
1240     len--;
1241     if (!(flags & 0x10))
1242         return -1;
1243     if (len < 6)
1244         return -1;
1245     v = AV_RB32(p);
1246     *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1247     *ppcr_low = ((p[4] & 1) << 8) | p[5];
1248     return 0;
1249 }
1250
1251 static int mpegts_read_header(AVFormatContext *s,
1252                               AVFormatParameters *ap)
1253 {
1254     MpegTSContext *ts = s->priv_data;
1255     ByteIOContext *pb = s->pb;
1256     uint8_t buf[5*1024];
1257     int len;
1258     int64_t pos;
1259
1260     if (ap) {
1261         ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1262         if(ap->mpeg2ts_raw){
1263             av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1264             return -1;
1265         }
1266     }
1267
1268     /* read the first 1024 bytes to get packet size */
1269     pos = url_ftell(pb);
1270     len = get_buffer(pb, buf, sizeof(buf));
1271     if (len != sizeof(buf))
1272         goto fail;
1273     ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1274     if (ts->raw_packet_size <= 0)
1275         goto fail;
1276     ts->stream = s;
1277     ts->auto_guess = 0;
1278
1279     if (s->iformat == &mpegts_demuxer) {
1280         /* normal demux */
1281
1282         /* first do a scaning to get all the services */
1283         url_fseek(pb, pos, SEEK_SET);
1284         mpegts_scan_sdt(ts);
1285
1286         mpegts_set_service(ts);
1287
1288         handle_packets(ts, s->probesize);
1289         /* if could not find service, enable auto_guess */
1290
1291         ts->auto_guess = 1;
1292
1293 #ifdef DEBUG_SI
1294         av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");
1295 #endif
1296         s->ctx_flags |= AVFMTCTX_NOHEADER;
1297     } else {
1298         AVStream *st;
1299         int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1300         int64_t pcrs[2], pcr_h;
1301         int packet_count[2];
1302         uint8_t packet[TS_PACKET_SIZE];
1303
1304         /* only read packets */
1305
1306         st = av_new_stream(s, 0);
1307         if (!st)
1308             goto fail;
1309         av_set_pts_info(st, 60, 1, 27000000);
1310         st->codec->codec_type = CODEC_TYPE_DATA;
1311         st->codec->codec_id = CODEC_ID_MPEG2TS;
1312
1313         /* we iterate until we find two PCRs to estimate the bitrate */
1314         pcr_pid = -1;
1315         nb_pcrs = 0;
1316         nb_packets = 0;
1317         for(;;) {
1318             ret = read_packet(s->pb, packet, ts->raw_packet_size);
1319             if (ret < 0)
1320                 return -1;
1321             pid = AV_RB16(packet + 1) & 0x1fff;
1322             if ((pcr_pid == -1 || pcr_pid == pid) &&
1323                 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1324                 pcr_pid = pid;
1325                 packet_count[nb_pcrs] = nb_packets;
1326                 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1327                 nb_pcrs++;
1328                 if (nb_pcrs >= 2)
1329                     break;
1330             }
1331             nb_packets++;
1332         }
1333
1334         /* NOTE1: the bitrate is computed without the FEC */
1335         /* NOTE2: it is only the bitrate of the start of the stream */
1336         ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1337         ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1338         s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1339         st->codec->bit_rate = s->bit_rate;
1340         st->start_time = ts->cur_pcr;
1341 #if 0
1342         av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1343                st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1344 #endif
1345     }
1346
1347     url_fseek(pb, pos, SEEK_SET);
1348     return 0;
1349  fail:
1350     return -1;
1351 }
1352
1353 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1354
1355 static int mpegts_raw_read_packet(AVFormatContext *s,
1356                                   AVPacket *pkt)
1357 {
1358     MpegTSContext *ts = s->priv_data;
1359     int ret, i;
1360     int64_t pcr_h, next_pcr_h, pos;
1361     int pcr_l, next_pcr_l;
1362     uint8_t pcr_buf[12];
1363
1364     if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1365         return AVERROR(ENOMEM);
1366     pkt->pos= url_ftell(s->pb);
1367     ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1368     if (ret < 0) {
1369         av_free_packet(pkt);
1370         return ret;
1371     }
1372     if (ts->mpeg2ts_compute_pcr) {
1373         /* compute exact PCR for each packet */
1374         if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1375             /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1376             pos = url_ftell(s->pb);
1377             for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1378                 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1379                 get_buffer(s->pb, pcr_buf, 12);
1380                 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1381                     /* XXX: not precise enough */
1382                     ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1383                         (i + 1);
1384                     break;
1385                 }
1386             }
1387             url_fseek(s->pb, pos, SEEK_SET);
1388             /* no next PCR found: we use previous increment */
1389             ts->cur_pcr = pcr_h * 300 + pcr_l;
1390         }
1391         pkt->pts = ts->cur_pcr;
1392         pkt->duration = ts->pcr_incr;
1393         ts->cur_pcr += ts->pcr_incr;
1394     }
1395     pkt->stream_index = 0;
1396     return 0;
1397 }
1398
1399 static int mpegts_read_packet(AVFormatContext *s,
1400                               AVPacket *pkt)
1401 {
1402     MpegTSContext *ts = s->priv_data;
1403
1404     ts->pkt = pkt;
1405     return handle_packets(ts, 0);
1406 }
1407
1408 static int mpegts_read_close(AVFormatContext *s)
1409 {
1410     MpegTSContext *ts = s->priv_data;
1411     int i;
1412
1413     clear_programs(ts);
1414
1415     for(i=0;i<NB_PID_MAX;i++)
1416         if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1417
1418     return 0;
1419 }
1420
1421 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1422                               int64_t *ppos, int64_t pos_limit)
1423 {
1424     MpegTSContext *ts = s->priv_data;
1425     int64_t pos, timestamp;
1426     uint8_t buf[TS_PACKET_SIZE];
1427     int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1428     const int find_next= 1;
1429     pos = ((*ppos  + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1430     if (find_next) {
1431         for(;;) {
1432             url_fseek(s->pb, pos, SEEK_SET);
1433             if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1434                 return AV_NOPTS_VALUE;
1435             if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1436                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1437                 break;
1438             }
1439             pos += ts->raw_packet_size;
1440         }
1441     } else {
1442         for(;;) {
1443             pos -= ts->raw_packet_size;
1444             if (pos < 0)
1445                 return AV_NOPTS_VALUE;
1446             url_fseek(s->pb, pos, SEEK_SET);
1447             if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1448                 return AV_NOPTS_VALUE;
1449             if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1450                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1451                 break;
1452             }
1453         }
1454     }
1455     *ppos = pos;
1456
1457     return timestamp;
1458 }
1459
1460 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1461     MpegTSContext *ts = s->priv_data;
1462     uint8_t buf[TS_PACKET_SIZE];
1463     int64_t pos;
1464
1465     if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1466         return -1;
1467
1468     pos= url_ftell(s->pb);
1469
1470     for(;;) {
1471         url_fseek(s->pb, pos, SEEK_SET);
1472         if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1473             return -1;
1474 //        pid = AV_RB16(buf + 1) & 0x1fff;
1475         if(buf[1] & 0x40) break;
1476         pos += ts->raw_packet_size;
1477     }
1478     url_fseek(s->pb, pos, SEEK_SET);
1479
1480     return 0;
1481 }
1482
1483 /**************************************************************/
1484 /* parsing functions - called from other demuxers such as RTP */
1485
1486 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1487 {
1488     MpegTSContext *ts;
1489
1490     ts = av_mallocz(sizeof(MpegTSContext));
1491     if (!ts)
1492         return NULL;
1493     /* no stream case, currently used by RTP */
1494     ts->raw_packet_size = TS_PACKET_SIZE;
1495     ts->stream = s;
1496     ts->auto_guess = 1;
1497     return ts;
1498 }
1499
1500 /* return the consumed length if a packet was output, or -1 if no
1501    packet is output */
1502 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1503                         const uint8_t *buf, int len)
1504 {
1505     int len1;
1506
1507     len1 = len;
1508     ts->pkt = pkt;
1509     ts->stop_parse = 0;
1510     for(;;) {
1511         if (ts->stop_parse>0)
1512             break;
1513         if (len < TS_PACKET_SIZE)
1514             return -1;
1515         if (buf[0] != 0x47) {
1516             buf++;
1517             len--;
1518         } else {
1519             handle_packet(ts, buf);
1520             buf += TS_PACKET_SIZE;
1521             len -= TS_PACKET_SIZE;
1522         }
1523     }
1524     return len1 - len;
1525 }
1526
1527 void mpegts_parse_close(MpegTSContext *ts)
1528 {
1529     int i;
1530
1531     for(i=0;i<NB_PID_MAX;i++)
1532         av_free(ts->pids[i]);
1533     av_free(ts);
1534 }
1535
1536 AVInputFormat mpegts_demuxer = {
1537     "mpegts",
1538     NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1539     sizeof(MpegTSContext),
1540     mpegts_probe,
1541     mpegts_read_header,
1542     mpegts_read_packet,
1543     mpegts_read_close,
1544     read_seek,
1545     mpegts_get_pcr,
1546     .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1547 };
1548
1549 AVInputFormat mpegtsraw_demuxer = {
1550     "mpegtsraw",
1551     NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1552     sizeof(MpegTSContext),
1553     NULL,
1554     mpegts_read_header,
1555     mpegts_raw_read_packet,
1556     mpegts_read_close,
1557     read_seek,
1558     mpegts_get_pcr,
1559     .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1560 };