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     int check_crc:1;
  67     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     else if (filter->type == MPEGTS_PES)
 338         av_freep(&filter->u.pes_filter.opaque);
 339
 340     av_free(filter);
 341     ts->pids[pid] = NULL;
 342 }
 343
 344 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
 345     int stat[packet_size];
 346     int i;
 347     int x=0;
 348     int best_score=0;
 349
 350     memset(stat, 0, packet_size*sizeof(int));
 351
 352     for(x=i=0; i<size; i++){
 353         if(buf[i] == 0x47){
 354             stat[x]++;
 355             if(stat[x] > best_score){
 356                 best_score= stat[x];
 357                 if(index) *index= x;
 358             }
 359         }
 360
 361         x++;
 362         if(x == packet_size) x= 0;
 363     }
 364
 365     return best_score;
 366 }
 367
 368 /* autodetect fec presence. Must have at least 1024 bytes  */
 369 static int get_packet_size(const uint8_t *buf, int size)
 370 {
 371     int score, fec_score, dvhs_score;
 372
 373     if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
 374         return -1;
 375
 376     score    = analyze(buf, size, TS_PACKET_SIZE, NULL);
 377     dvhs_score    = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
 378     fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
 379 //    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
 380
 381     if     (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
 382     else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
 383     else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
 384     else                       return -1;
 385 }
 386
 387 typedef struct SectionHeader {
 388     uint8_t tid;
 389     uint16_t id;
 390     uint8_t version;
 391     uint8_t sec_num;
 392     uint8_t last_sec_num;
 393 } SectionHeader;
 394
 395 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
 396 {
 397     const uint8_t *p;
 398     int c;
 399
 400     p = *pp;
 401     if (p >= p_end)
 402         return -1;
 403     c = *p++;
 404     *pp = p;
 405     return c;
 406 }
 407
 408 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
 409 {
 410     const uint8_t *p;
 411     int c;
 412
 413     p = *pp;
 414     if ((p + 1) >= p_end)
 415         return -1;
 416     c = AV_RB16(p);
 417     p += 2;
 418     *pp = p;
 419     return c;
 420 }
 421
 422 /* read and allocate a DVB string preceeded by its length */
 423 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
 424 {
 425     int len;
 426     const uint8_t *p;
 427     char *str;
 428
 429     p = *pp;
 430     len = get8(&p, p_end);
 431     if (len < 0)
 432         return NULL;
 433     if ((p + len) > p_end)
 434         return NULL;
 435     str = av_malloc(len + 1);
 436     if (!str)
 437         return NULL;
 438     memcpy(str, p, len);
 439     str[len] = '\0';
 440     p += len;
 441     *pp = p;
 442     return str;
 443 }
 444
 445 static int parse_section_header(SectionHeader *h,
 446                                 const uint8_t **pp, const uint8_t *p_end)
 447 {
 448     int val;
 449
 450     val = get8(pp, p_end);
 451     if (val < 0)
 452         return -1;
 453     h->tid = val;
 454     *pp += 2;
 455     val = get16(pp, p_end);
 456     if (val < 0)
 457         return -1;
 458     h->id = val;
 459     val = get8(pp, p_end);
 460     if (val < 0)
 461         return -1;
 462     h->version = (val >> 1) & 0x1f;
 463     val = get8(pp, p_end);
 464     if (val < 0)
 465         return -1;
 466     h->sec_num = val;
 467     val = get8(pp, p_end);
 468     if (val < 0)
 469         return -1;
 470     h->last_sec_num = val;
 471     return 0;
 472 }
 473
 474
 475 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
 476 {
 477     MpegTSContext *ts = filter->u.section_filter.opaque;
 478     SectionHeader h1, *h = &h1;
 479     PESContext *pes;
 480     AVStream *st;
 481     const uint8_t *p, *p_end, *desc_list_end, *desc_end;
 482     int program_info_length, pcr_pid, pid, stream_type;
 483     int desc_list_len, desc_len, desc_tag;
 484     int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
 485     char language[4] = {0}; /* initialize to kill warnings */
 486     int has_hdmv_descr = 0;
 487
 488 #ifdef DEBUG_SI
 489     av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
 490     av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
 491 #endif
 492     p_end = section + section_len - 4;
 493     p = section;
 494     if (parse_section_header(h, &p, p_end) < 0)
 495         return;
 496 #ifdef DEBUG_SI
 497     av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",
 498            h->id, h->sec_num, h->last_sec_num);
 499 #endif
 500     if (h->tid != PMT_TID)
 501         return;
 502
 503     clear_program(ts, h->id);
 504     pcr_pid = get16(&p, p_end) & 0x1fff;
 505     if (pcr_pid < 0)
 506         return;
 507     add_pid_to_pmt(ts, h->id, pcr_pid);
 508 #ifdef DEBUG_SI
 509     av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);
 510 #endif
 511     program_info_length = get16(&p, p_end) & 0xfff;
 512     if (program_info_length < 0)
 513         return;
 514     while(program_info_length >= 2) {
 515         uint8_t tag, len;
 516         tag = get8(&p, p_end);
 517         len = get8(&p, p_end);
 518         if(len > program_info_length - 2)
 519             //something else is broken, exit the program_descriptors_loop
 520             break;
 521         program_info_length -= len + 2;
 522         if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
 523             uint8_t bytes[4];
 524             bytes[0] = get8(&p, p_end);
 525             bytes[1] = get8(&p, p_end);
 526             bytes[2] = get8(&p, p_end);
 527             bytes[3] = get8(&p, p_end);
 528             len -= 4;
 529             if(bytes[0] == 'H' && bytes[1] == 'D' &&
 530                bytes[2] == 'M' && bytes[3] == 'V')
 531                 has_hdmv_descr = 1;
 532         }
 533         p += len;
 534     }
 535     p += program_info_length;
 536     if (p >= p_end)
 537         return;
 538     for(;;) {
 539         language[0] = 0;
 540         st = 0;
 541         stream_type = get8(&p, p_end);
 542         if (stream_type < 0)
 543             break;
 544         pid = get16(&p, p_end) & 0x1fff;
 545         if (pid < 0)
 546             break;
 547         desc_list_len = get16(&p, p_end) & 0xfff;
 548         if (desc_list_len < 0)
 549             break;
 550         desc_list_end = p + desc_list_len;
 551         if (desc_list_end > p_end)
 552             break;
 553         for(;;) {
 554             desc_tag = get8(&p, desc_list_end);
 555             if (desc_tag < 0)
 556                 break;
 557             if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
 558                 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
 559                     /*assume DVB AC-3 Audio*/
 560                     stream_type = STREAM_TYPE_AUDIO_AC3;
 561                 } else if(desc_tag == 0x7B) {
 562                     /* DVB DTS audio */
 563                     stream_type = STREAM_TYPE_AUDIO_DTS;
 564                 }
 565             }
 566             desc_len = get8(&p, desc_list_end);
 567             desc_end = p + desc_len;
 568             if (desc_end > desc_list_end)
 569                 break;
 570 #ifdef DEBUG_SI
 571             av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
 572                    desc_tag, desc_len);
 573 #endif
 574             switch(desc_tag) {
 575             case DVB_SUBT_DESCID:
 576                 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
 577                     stream_type = STREAM_TYPE_SUBTITLE_DVB;
 578
 579                 language[0] = get8(&p, desc_end);
 580                 language[1] = get8(&p, desc_end);
 581                 language[2] = get8(&p, desc_end);
 582                 language[3] = 0;
 583                 get8(&p, desc_end);
 584                 comp_page = get16(&p, desc_end);
 585                 anc_page = get16(&p, desc_end);
 586
 587                 break;
 588             case 0x0a: /* ISO 639 language descriptor */
 589                 language[0] = get8(&p, desc_end);
 590                 language[1] = get8(&p, desc_end);
 591                 language[2] = get8(&p, desc_end);
 592                 language[3] = 0;
 593                 break;
 594             default:
 595                 break;
 596             }
 597             p = desc_end;
 598         }
 599         p = desc_list_end;
 600
 601 #ifdef DEBUG_SI
 602         av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",
 603                stream_type, pid);
 604 #endif
 605
 606         /* now create ffmpeg stream */
 607         switch(stream_type) {
 608         case STREAM_TYPE_AUDIO_MPEG1:
 609         case STREAM_TYPE_AUDIO_MPEG2:
 610         case STREAM_TYPE_VIDEO_MPEG1:
 611         case STREAM_TYPE_VIDEO_MPEG2:
 612         case STREAM_TYPE_VIDEO_MPEG4:
 613         case STREAM_TYPE_VIDEO_H264:
 614         case STREAM_TYPE_VIDEO_VC1:
 615         case STREAM_TYPE_AUDIO_AAC:
 616         case STREAM_TYPE_AUDIO_AC3:
 617         case STREAM_TYPE_AUDIO_DTS:
 618         case STREAM_TYPE_AUDIO_HDMV_DTS:
 619         case STREAM_TYPE_SUBTITLE_DVB:
 620             if(stream_type == STREAM_TYPE_AUDIO_HDMV_DTS && !has_hdmv_descr)
 621                 break;
 622             if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
 623                 pes= ts->pids[pid]->u.pes_filter.opaque;
 624                 st= pes->st;
 625             }else{
 626                 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
 627                 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
 628                 if (pes)
 629                     st = new_pes_av_stream(pes, 0);
 630             }
 631             add_pid_to_pmt(ts, h->id, pid);
 632             if(st)
 633                 av_program_add_stream_index(ts->stream, h->id, st->index);
 634             break;
 635         default:
 636             /* we ignore the other streams */
 637             break;
 638         }
 639
 640         if (st) {
 641             if (language[0] != 0) {
 642                 memcpy(st->language, language, 4);
 643             }
 644
 645             if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
 646                 st->codec->sub_id = (anc_page << 16) | comp_page;
 647             }
 648         }
 649     }
 650     /* all parameters are there */
 651     ts->stop_parse++;
 652     mpegts_close_filter(ts, filter);
 653 }
 654
 655 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
 656 {
 657     MpegTSContext *ts = filter->u.section_filter.opaque;
 658     SectionHeader h1, *h = &h1;
 659     const uint8_t *p, *p_end;
 660     int sid, pmt_pid;
 661
 662 #ifdef DEBUG_SI
 663     av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
 664     av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
 665 #endif
 666     p_end = section + section_len - 4;
 667     p = section;
 668     if (parse_section_header(h, &p, p_end) < 0)
 669         return;
 670     if (h->tid != PAT_TID)
 671         return;
 672
 673     clear_programs(ts);
 674     for(;;) {
 675         sid = get16(&p, p_end);
 676         if (sid < 0)
 677             break;
 678         pmt_pid = get16(&p, p_end) & 0x1fff;
 679         if (pmt_pid < 0)
 680             break;
 681 #ifdef DEBUG_SI
 682         av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
 683 #endif
 684         if (sid == 0x0000) {
 685             /* NIT info */
 686         } else {
 687             av_new_program(ts->stream, sid);
 688             ts->stop_parse--;
 689             mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
 690             add_pat_entry(ts, sid);
 691             add_pid_to_pmt(ts, sid, 0); //add pat pid to program
 692             add_pid_to_pmt(ts, sid, pmt_pid);
 693         }
 694     }
 695     /* not found */
 696     ts->stop_parse++;
 697
 698     mpegts_close_filter(ts, filter);
 699 }
 700
 701 static void mpegts_set_service(MpegTSContext *ts)
 702 {
 703     mpegts_open_section_filter(ts, PAT_PID,
 704                                                 pat_cb, ts, 1);
 705 }
 706
 707 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
 708 {
 709     MpegTSContext *ts = filter->u.section_filter.opaque;
 710     SectionHeader h1, *h = &h1;
 711     const uint8_t *p, *p_end, *desc_list_end, *desc_end;
 712     int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
 713     char *name, *provider_name;
 714
 715 #ifdef DEBUG_SI
 716     av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");
 717     av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
 718 #endif
 719
 720     p_end = section + section_len - 4;
 721     p = section;
 722     if (parse_section_header(h, &p, p_end) < 0)
 723         return;
 724     if (h->tid != SDT_TID)
 725         return;
 726     onid = get16(&p, p_end);
 727     if (onid < 0)
 728         return;
 729     val = get8(&p, p_end);
 730     if (val < 0)
 731         return;
 732     for(;;) {
 733         sid = get16(&p, p_end);
 734         if (sid < 0)
 735             break;
 736         val = get8(&p, p_end);
 737         if (val < 0)
 738             break;
 739         desc_list_len = get16(&p, p_end) & 0xfff;
 740         if (desc_list_len < 0)
 741             break;
 742         desc_list_end = p + desc_list_len;
 743         if (desc_list_end > p_end)
 744             break;
 745         for(;;) {
 746             desc_tag = get8(&p, desc_list_end);
 747             if (desc_tag < 0)
 748                 break;
 749             desc_len = get8(&p, desc_list_end);
 750             desc_end = p + desc_len;
 751             if (desc_end > desc_list_end)
 752                 break;
 753 #ifdef DEBUG_SI
 754             av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
 755                    desc_tag, desc_len);
 756 #endif
 757             switch(desc_tag) {
 758             case 0x48:
 759                 service_type = get8(&p, p_end);
 760                 if (service_type < 0)
 761                     break;
 762                 provider_name = getstr8(&p, p_end);
 763                 if (!provider_name)
 764                     break;
 765                 name = getstr8(&p, p_end);
 766                 if (name) {
 767                     AVProgram *program = av_new_program(ts->stream, sid);
 768                     if(program)
 769                         av_set_program_name(program, provider_name, name);
 770                 }
 771                 av_free(name);
 772                 av_free(provider_name);
 773                 break;
 774             default:
 775                 break;
 776             }
 777             p = desc_end;
 778         }
 779         p = desc_list_end;
 780     }
 781 }
 782
 783 /* scan services in a transport stream by looking at the SDT */
 784 static void mpegts_scan_sdt(MpegTSContext *ts)
 785 {
 786     mpegts_open_section_filter(ts, SDT_PID,
 787                                                 sdt_cb, ts, 1);
 788 }
 789
 790 static int64_t get_pts(const uint8_t *p)
 791 {
 792     int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
 793     pts |= (AV_RB16(p + 1) >> 1) << 15;
 794     pts |=  AV_RB16(p + 3) >> 1;
 795     return pts;
 796 }
 797
 798 /* return non zero if a packet could be constructed */
 799 static void mpegts_push_data(MpegTSFilter *filter,
 800                              const uint8_t *buf, int buf_size, int is_start)
 801 {
 802     PESContext *pes = filter->u.pes_filter.opaque;
 803     MpegTSContext *ts = pes->ts;
 804     const uint8_t *p;
 805     int len, code;
 806
 807     if(!ts->pkt)
 808         return;
 809
 810     if (is_start) {
 811         pes->state = MPEGTS_HEADER;
 812         pes->data_index = 0;
 813     }
 814     p = buf;
 815     while (buf_size > 0) {
 816         switch(pes->state) {
 817         case MPEGTS_HEADER:
 818             len = PES_START_SIZE - pes->data_index;
 819             if (len > buf_size)
 820                 len = buf_size;
 821             memcpy(pes->header + pes->data_index, p, len);
 822             pes->data_index += len;
 823             p += len;
 824             buf_size -= len;
 825             if (pes->data_index == PES_START_SIZE) {
 826                 /* we got all the PES or section header. We can now
 827                    decide */
 828 #if 0
 829                 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
 830 #endif
 831                 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
 832                     pes->header[2] == 0x01) {
 833                     /* it must be an mpeg2 PES stream */
 834                     code = pes->header[3] | 0x100;
 835                     if (!((code >= 0x1c0 && code <= 0x1df) ||
 836                           (code >= 0x1e0 && code <= 0x1ef) ||
 837                           (code == 0x1bd) || (code == 0x1fd)))
 838                         goto skip;
 839                     if (!pes->st) {
 840                         /* allocate stream */
 841                         new_pes_av_stream(pes, code);
 842                     }
 843                     pes->state = MPEGTS_PESHEADER_FILL;
 844                     pes->total_size = AV_RB16(pes->header + 4);
 845                     /* NOTE: a zero total size means the PES size is
 846                        unbounded */
 847                     if (pes->total_size)
 848                         pes->total_size += 6;
 849                     pes->pes_header_size = pes->header[8] + 9;
 850                 } else {
 851                     /* otherwise, it should be a table */
 852                     /* skip packet */
 853                 skip:
 854                     pes->state = MPEGTS_SKIP;
 855                     continue;
 856                 }
 857             }
 858             break;
 859             /**********************************************/
 860             /* PES packing parsing */
 861         case MPEGTS_PESHEADER_FILL:
 862             len = pes->pes_header_size - pes->data_index;
 863             if (len > buf_size)
 864                 len = buf_size;
 865             memcpy(pes->header + pes->data_index, p, len);
 866             pes->data_index += len;
 867             p += len;
 868             buf_size -= len;
 869             if (pes->data_index == pes->pes_header_size) {
 870                 const uint8_t *r;
 871                 unsigned int flags;
 872
 873                 flags = pes->header[7];
 874                 r = pes->header + 9;
 875                 pes->pts = AV_NOPTS_VALUE;
 876                 pes->dts = AV_NOPTS_VALUE;
 877                 if ((flags & 0xc0) == 0x80) {
 878                     pes->pts = get_pts(r);
 879                     r += 5;
 880                 } else if ((flags & 0xc0) == 0xc0) {
 881                     pes->pts = get_pts(r);
 882                     r += 5;
 883                     pes->dts = get_pts(r);
 884                     r += 5;
 885                 }
 886                 /* we got the full header. We parse it and get the payload */
 887                 pes->state = MPEGTS_PAYLOAD;
 888             }
 889             break;
 890         case MPEGTS_PAYLOAD:
 891             if (pes->total_size) {
 892                 len = pes->total_size - pes->data_index;
 893                 if (len > buf_size)
 894                     len = buf_size;
 895             } else {
 896                 len = buf_size;
 897             }
 898             if (len > 0) {
 899                 AVPacket *pkt = ts->pkt;
 900                 if (pes->st && av_new_packet(pkt, len) == 0) {
 901                     memcpy(pkt->data, p, len);
 902                     pkt->stream_index = pes->st->index;
 903                     pkt->pts = pes->pts;
 904                     pkt->dts = pes->dts;
 905                     /* reset pts values */
 906                     pes->pts = AV_NOPTS_VALUE;
 907                     pes->dts = AV_NOPTS_VALUE;
 908                     ts->stop_parse = 1;
 909                     return;
 910                 }
 911             }
 912             buf_size = 0;
 913             break;
 914         case MPEGTS_SKIP:
 915             buf_size = 0;
 916             break;
 917         }
 918     }
 919 }
 920
 921 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
 922 {
 923     AVStream *st;
 924     int codec_type, codec_id;
 925
 926     switch(pes->stream_type){
 927     case STREAM_TYPE_AUDIO_MPEG1:
 928     case STREAM_TYPE_AUDIO_MPEG2:
 929         codec_type = CODEC_TYPE_AUDIO;
 930         codec_id = CODEC_ID_MP3;
 931         break;
 932     case STREAM_TYPE_VIDEO_MPEG1:
 933     case STREAM_TYPE_VIDEO_MPEG2:
 934         codec_type = CODEC_TYPE_VIDEO;
 935         codec_id = CODEC_ID_MPEG2VIDEO;
 936         break;
 937     case STREAM_TYPE_VIDEO_MPEG4:
 938         codec_type = CODEC_TYPE_VIDEO;
 939         codec_id = CODEC_ID_MPEG4;
 940         break;
 941     case STREAM_TYPE_VIDEO_H264:
 942         codec_type = CODEC_TYPE_VIDEO;
 943         codec_id = CODEC_ID_H264;
 944         break;
 945     case STREAM_TYPE_VIDEO_VC1:
 946         codec_type = CODEC_TYPE_VIDEO;
 947         codec_id = CODEC_ID_VC1;
 948         break;
 949     case STREAM_TYPE_AUDIO_AAC:
 950         codec_type = CODEC_TYPE_AUDIO;
 951         codec_id = CODEC_ID_AAC;
 952         break;
 953     case STREAM_TYPE_AUDIO_AC3:
 954         codec_type = CODEC_TYPE_AUDIO;
 955         codec_id = CODEC_ID_AC3;
 956         break;
 957     case STREAM_TYPE_AUDIO_DTS:
 958     case STREAM_TYPE_AUDIO_HDMV_DTS:
 959         codec_type = CODEC_TYPE_AUDIO;
 960         codec_id = CODEC_ID_DTS;
 961         break;
 962     case STREAM_TYPE_SUBTITLE_DVB:
 963         codec_type = CODEC_TYPE_SUBTITLE;
 964         codec_id = CODEC_ID_DVB_SUBTITLE;
 965         break;
 966     default:
 967         if (code >= 0x1c0 && code <= 0x1df) {
 968             codec_type = CODEC_TYPE_AUDIO;
 969             codec_id = CODEC_ID_MP2;
 970         } else if (code == 0x1bd) {
 971             codec_type = CODEC_TYPE_AUDIO;
 972             codec_id = CODEC_ID_AC3;
 973         } else {
 974             codec_type = CODEC_TYPE_VIDEO;
 975             codec_id = CODEC_ID_MPEG1VIDEO;
 976         }
 977         break;
 978     }
 979     st = av_new_stream(pes->stream, pes->pid);
 980     if (st) {
 981         av_set_pts_info(st, 33, 1, 90000);
 982         st->priv_data = pes;
 983         st->codec->codec_type = codec_type;
 984         st->codec->codec_id = codec_id;
 985         st->need_parsing = AVSTREAM_PARSE_FULL;
 986         pes->st = st;
 987     }
 988     return st;
 989 }
 990
 991
 992 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
 993 {
 994     MpegTSFilter *tss;
 995     PESContext *pes;
 996
 997     /* if no pid found, then add a pid context */
 998     pes = av_mallocz(sizeof(PESContext));
 999     if (!pes)
1000         return 0;
1001     pes->ts = ts;
1002     pes->stream = ts->stream;
1003     pes->pid = pid;
1004     pes->pcr_pid = pcr_pid;
1005     pes->stream_type = stream_type;
1006     tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1007     if (!tss) {
1008         av_free(pes);
1009         return 0;
1010     }
1011     return pes;
1012 }
1013
1014 /* handle one TS packet */
1015 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
1016 {
1017     AVFormatContext *s = ts->stream;
1018     MpegTSFilter *tss;
1019     int len, pid, cc, cc_ok, afc, is_start;
1020     const uint8_t *p, *p_end;
1021
1022     pid = AV_RB16(packet + 1) & 0x1fff;
1023     if(pid && discard_pid(ts, pid))
1024         return;
1025     is_start = packet[1] & 0x40;
1026     tss = ts->pids[pid];
1027     if (ts->auto_guess && tss == NULL && is_start) {
1028         add_pes_stream(ts, pid, -1, 0);
1029         tss = ts->pids[pid];
1030     }
1031     if (!tss)
1032         return;
1033
1034     /* continuity check (currently not used) */
1035     cc = (packet[3] & 0xf);
1036     cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1037     tss->last_cc = cc;
1038
1039     /* skip adaptation field */
1040     afc = (packet[3] >> 4) & 3;
1041     p = packet + 4;
1042     if (afc == 0) /* reserved value */
1043         return;
1044     if (afc == 2) /* adaptation field only */
1045         return;
1046     if (afc == 3) {
1047         /* skip adapation field */
1048         p += p[0] + 1;
1049     }
1050     /* if past the end of packet, ignore */
1051     p_end = packet + TS_PACKET_SIZE;
1052     if (p >= p_end)
1053         return;
1054
1055     ts->pos47= url_ftell(ts->stream->pb) % ts->raw_packet_size;
1056
1057     if (tss->type == MPEGTS_SECTION) {
1058         if (is_start) {
1059             /* pointer field present */
1060             len = *p++;
1061             if (p + len > p_end)
1062                 return;
1063             if (len && cc_ok) {
1064                 /* write remaining section bytes */
1065                 write_section_data(s, tss,
1066                                    p, len, 0);
1067                 /* check whether filter has been closed */
1068                 if (!ts->pids[pid])
1069                     return;
1070             }
1071             p += len;
1072             if (p < p_end) {
1073                 write_section_data(s, tss,
1074                                    p, p_end - p, 1);
1075             }
1076         } else {
1077             if (cc_ok) {
1078                 write_section_data(s, tss,
1079                                    p, p_end - p, 0);
1080             }
1081         }
1082     } else {
1083         tss->u.pes_filter.pes_cb(tss,
1084                                  p, p_end - p, is_start);
1085     }
1086 }
1087
1088 /* XXX: try to find a better synchro over several packets (use
1089    get_packet_size() ?) */
1090 static int mpegts_resync(ByteIOContext *pb)
1091 {
1092     int c, i;
1093
1094     for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1095         c = url_fgetc(pb);
1096         if (c < 0)
1097             return -1;
1098         if (c == 0x47) {
1099             url_fseek(pb, -1, SEEK_CUR);
1100             return 0;
1101         }
1102     }
1103     /* no sync found */
1104     return -1;
1105 }
1106
1107 /* return -1 if error or EOF. Return 0 if OK. */
1108 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1109 {
1110     int skip, len;
1111
1112     for(;;) {
1113         len = get_buffer(pb, buf, TS_PACKET_SIZE);
1114         if (len != TS_PACKET_SIZE)
1115             return AVERROR(EIO);
1116         /* check paquet sync byte */
1117         if (buf[0] != 0x47) {
1118             /* find a new packet start */
1119             url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1120             if (mpegts_resync(pb) < 0)
1121                 return AVERROR_INVALIDDATA;
1122             else
1123                 continue;
1124         } else {
1125             skip = raw_packet_size - TS_PACKET_SIZE;
1126             if (skip > 0)
1127                 url_fskip(pb, skip);
1128             break;
1129         }
1130     }
1131     return 0;
1132 }
1133
1134 static int handle_packets(MpegTSContext *ts, int nb_packets)
1135 {
1136     AVFormatContext *s = ts->stream;
1137     ByteIOContext *pb = s->pb;
1138     uint8_t packet[TS_PACKET_SIZE];
1139     int packet_num, ret;
1140
1141     ts->stop_parse = 0;
1142     packet_num = 0;
1143     for(;;) {
1144         if (ts->stop_parse>0)
1145             break;
1146         packet_num++;
1147         if (nb_packets != 0 && packet_num >= nb_packets)
1148             break;
1149         ret = read_packet(pb, packet, ts->raw_packet_size);
1150         if (ret != 0)
1151             return ret;
1152         handle_packet(ts, packet);
1153     }
1154     return 0;
1155 }
1156
1157 static int mpegts_probe(AVProbeData *p)
1158 {
1159 #if 1
1160     const int size= p->buf_size;
1161     int score, fec_score, dvhs_score;
1162 #define CHECK_COUNT 10
1163
1164     if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))
1165         return -1;
1166
1167     score    = analyze(p->buf, TS_PACKET_SIZE    *CHECK_COUNT, TS_PACKET_SIZE, NULL);
1168     dvhs_score  = analyze(p->buf, TS_DVHS_PACKET_SIZE    *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL);
1169     fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);
1170 //    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1171
1172 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1173     if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;
1174     else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;
1175     else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1176     else                                    return -1;
1177 #else
1178     /* only use the extension for safer guess */
1179     if (match_ext(p->filename, "ts"))
1180         return AVPROBE_SCORE_MAX;
1181     else
1182         return 0;
1183 #endif
1184 }
1185
1186 /* return the 90 kHz PCR and the extension for the 27 MHz PCR. return
1187    (-1) if not available */
1188 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1189                      const uint8_t *packet)
1190 {
1191     int afc, len, flags;
1192     const uint8_t *p;
1193     unsigned int v;
1194
1195     afc = (packet[3] >> 4) & 3;
1196     if (afc <= 1)
1197         return -1;
1198     p = packet + 4;
1199     len = p[0];
1200     p++;
1201     if (len == 0)
1202         return -1;
1203     flags = *p++;
1204     len--;
1205     if (!(flags & 0x10))
1206         return -1;
1207     if (len < 6)
1208         return -1;
1209     v = AV_RB32(p);
1210     *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1211     *ppcr_low = ((p[4] & 1) << 8) | p[5];
1212     return 0;
1213 }
1214
1215 static int mpegts_read_header(AVFormatContext *s,
1216                               AVFormatParameters *ap)
1217 {
1218     MpegTSContext *ts = s->priv_data;
1219     ByteIOContext *pb = s->pb;
1220     uint8_t buf[1024];
1221     int len;
1222     int64_t pos;
1223
1224     if (ap) {
1225         ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1226         if(ap->mpeg2ts_raw){
1227             av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1228             return -1;
1229         }
1230     }
1231
1232     /* read the first 1024 bytes to get packet size */
1233     pos = url_ftell(pb);
1234     len = get_buffer(pb, buf, sizeof(buf));
1235     if (len != sizeof(buf))
1236         goto fail;
1237     ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1238     if (ts->raw_packet_size <= 0)
1239         goto fail;
1240     ts->stream = s;
1241     ts->auto_guess = 0;
1242
1243     if (s->iformat == &mpegts_demuxer) {
1244         /* normal demux */
1245
1246         /* first do a scaning to get all the services */
1247         url_fseek(pb, pos, SEEK_SET);
1248         mpegts_scan_sdt(ts);
1249
1250         mpegts_set_service(ts);
1251
1252         handle_packets(ts, s->probesize);
1253         /* if could not find service, enable auto_guess */
1254
1255         ts->auto_guess = 1;
1256
1257 #ifdef DEBUG_SI
1258         av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");
1259 #endif
1260         s->ctx_flags |= AVFMTCTX_NOHEADER;
1261     } else {
1262         AVStream *st;
1263         int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1264         int64_t pcrs[2], pcr_h;
1265         int packet_count[2];
1266         uint8_t packet[TS_PACKET_SIZE];
1267
1268         /* only read packets */
1269
1270         st = av_new_stream(s, 0);
1271         if (!st)
1272             goto fail;
1273         av_set_pts_info(st, 60, 1, 27000000);
1274         st->codec->codec_type = CODEC_TYPE_DATA;
1275         st->codec->codec_id = CODEC_ID_MPEG2TS;
1276
1277         /* we iterate until we find two PCRs to estimate the bitrate */
1278         pcr_pid = -1;
1279         nb_pcrs = 0;
1280         nb_packets = 0;
1281         for(;;) {
1282             ret = read_packet(s->pb, packet, ts->raw_packet_size);
1283             if (ret < 0)
1284                 return -1;
1285             pid = AV_RB16(packet + 1) & 0x1fff;
1286             if ((pcr_pid == -1 || pcr_pid == pid) &&
1287                 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1288                 pcr_pid = pid;
1289                 packet_count[nb_pcrs] = nb_packets;
1290                 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1291                 nb_pcrs++;
1292                 if (nb_pcrs >= 2)
1293                     break;
1294             }
1295             nb_packets++;
1296         }
1297
1298         /* NOTE1: the bitrate is computed without the FEC */
1299         /* NOTE2: it is only the bitrate of the start of the stream */
1300         ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1301         ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1302         s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1303         st->codec->bit_rate = s->bit_rate;
1304         st->start_time = ts->cur_pcr;
1305 #if 0
1306         av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1307                st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1308 #endif
1309     }
1310
1311     url_fseek(pb, pos, SEEK_SET);
1312     return 0;
1313  fail:
1314     return -1;
1315 }
1316
1317 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1318
1319 static int mpegts_raw_read_packet(AVFormatContext *s,
1320                                   AVPacket *pkt)
1321 {
1322     MpegTSContext *ts = s->priv_data;
1323     int ret, i;
1324     int64_t pcr_h, next_pcr_h, pos;
1325     int pcr_l, next_pcr_l;
1326     uint8_t pcr_buf[12];
1327
1328     if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1329         return AVERROR(ENOMEM);
1330     pkt->pos= url_ftell(s->pb);
1331     ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1332     if (ret < 0) {
1333         av_free_packet(pkt);
1334         return ret;
1335     }
1336     if (ts->mpeg2ts_compute_pcr) {
1337         /* compute exact PCR for each packet */
1338         if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1339             /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1340             pos = url_ftell(s->pb);
1341             for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1342                 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1343                 get_buffer(s->pb, pcr_buf, 12);
1344                 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1345                     /* XXX: not precise enough */
1346                     ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1347                         (i + 1);
1348                     break;
1349                 }
1350             }
1351             url_fseek(s->pb, pos, SEEK_SET);
1352             /* no next PCR found: we use previous increment */
1353             ts->cur_pcr = pcr_h * 300 + pcr_l;
1354         }
1355         pkt->pts = ts->cur_pcr;
1356         pkt->duration = ts->pcr_incr;
1357         ts->cur_pcr += ts->pcr_incr;
1358     }
1359     pkt->stream_index = 0;
1360     return 0;
1361 }
1362
1363 static int mpegts_read_packet(AVFormatContext *s,
1364                               AVPacket *pkt)
1365 {
1366     MpegTSContext *ts = s->priv_data;
1367
1368     ts->pkt = pkt;
1369     return handle_packets(ts, 0);
1370 }
1371
1372 static int mpegts_read_close(AVFormatContext *s)
1373 {
1374     MpegTSContext *ts = s->priv_data;
1375     int i;
1376
1377     clear_programs(ts);
1378
1379     for(i=0;i<NB_PID_MAX;i++)
1380         if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1381
1382     return 0;
1383 }
1384
1385 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1386                               int64_t *ppos, int64_t pos_limit)
1387 {
1388     MpegTSContext *ts = s->priv_data;
1389     int64_t pos, timestamp;
1390     uint8_t buf[TS_PACKET_SIZE];
1391     int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1392     const int find_next= 1;
1393     pos = ((*ppos  + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1394     if (find_next) {
1395         for(;;) {
1396             url_fseek(s->pb, pos, SEEK_SET);
1397             if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1398                 return AV_NOPTS_VALUE;
1399             if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1400                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1401                 break;
1402             }
1403             pos += ts->raw_packet_size;
1404         }
1405     } else {
1406         for(;;) {
1407             pos -= ts->raw_packet_size;
1408             if (pos < 0)
1409                 return AV_NOPTS_VALUE;
1410             url_fseek(s->pb, pos, SEEK_SET);
1411             if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1412                 return AV_NOPTS_VALUE;
1413             if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1414                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1415                 break;
1416             }
1417         }
1418     }
1419     *ppos = pos;
1420
1421     return timestamp;
1422 }
1423
1424 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1425     MpegTSContext *ts = s->priv_data;
1426     uint8_t buf[TS_PACKET_SIZE];
1427     int64_t pos;
1428
1429     if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1430         return -1;
1431
1432     pos= url_ftell(s->pb);
1433
1434     for(;;) {
1435         url_fseek(s->pb, pos, SEEK_SET);
1436         if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1437             return -1;
1438 //        pid = AV_RB16(buf + 1) & 0x1fff;
1439         if(buf[1] & 0x40) break;
1440         pos += ts->raw_packet_size;
1441     }
1442     url_fseek(s->pb, pos, SEEK_SET);
1443
1444     return 0;
1445 }
1446
1447 /**************************************************************/
1448 /* parsing functions - called from other demuxers such as RTP */
1449
1450 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1451 {
1452     MpegTSContext *ts;
1453
1454     ts = av_mallocz(sizeof(MpegTSContext));
1455     if (!ts)
1456         return NULL;
1457     /* no stream case, currently used by RTP */
1458     ts->raw_packet_size = TS_PACKET_SIZE;
1459     ts->stream = s;
1460     ts->auto_guess = 1;
1461     return ts;
1462 }
1463
1464 /* return the consumed length if a packet was output, or -1 if no
1465    packet is output */
1466 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1467                         const uint8_t *buf, int len)
1468 {
1469     int len1;
1470
1471     len1 = len;
1472     ts->pkt = pkt;
1473     ts->stop_parse = 0;
1474     for(;;) {
1475         if (ts->stop_parse>0)
1476             break;
1477         if (len < TS_PACKET_SIZE)
1478             return -1;
1479         if (buf[0] != 0x47) {
1480             buf++;
1481             len--;
1482         } else {
1483             handle_packet(ts, buf);
1484             buf += TS_PACKET_SIZE;
1485             len -= TS_PACKET_SIZE;
1486         }
1487     }
1488     return len1 - len;
1489 }
1490
1491 void mpegts_parse_close(MpegTSContext *ts)
1492 {
1493     int i;
1494
1495     for(i=0;i<NB_PID_MAX;i++)
1496         av_free(ts->pids[i]);
1497     av_free(ts);
1498 }
1499
1500 AVInputFormat mpegts_demuxer = {
1501     "mpegts",
1502     NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1503     sizeof(MpegTSContext),
1504     mpegts_probe,
1505     mpegts_read_header,
1506     mpegts_read_packet,
1507     mpegts_read_close,
1508     read_seek,
1509     mpegts_get_pcr,
1510     .flags = AVFMT_SHOW_IDS,
1511 };
1512
1513 AVInputFormat mpegtsraw_demuxer = {
1514     "mpegtsraw",
1515     NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1516     sizeof(MpegTSContext),
1517     NULL,
1518     mpegts_read_header,
1519     mpegts_raw_read_packet,
1520     mpegts_read_close,
1521     read_seek,
1522     mpegts_get_pcr,
1523     .flags = AVFMT_SHOW_IDS,
1524 };