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