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 Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 //#define USE_SYNCPOINT_SEARCH
  23
  24 #include "libavutil/crc.h"
  25 #include "libavutil/intreadwrite.h"
  26 #include "libavutil/log.h"
  27 #include "libavutil/dict.h"
  28 #include "libavutil/mathematics.h"
  29 #include "libavutil/opt.h"
  30 #include "libavcodec/bytestream.h"
  31 #include "libavcodec/get_bits.h"
  32 #include "avformat.h"
  33 #include "mpegts.h"
  34 #include "internal.h"
  35 #include "avio_internal.h"
  36 #include "seek.h"
  37 #include "mpeg.h"
  38 #include "isom.h"
  39
  40 /* maximum size in which we look for synchronisation if
  41    synchronisation is lost */
  42 #define MAX_RESYNC_SIZE 65536
  43
  44 #define MAX_PES_PAYLOAD 200*1024
  45
  46 #define MAX_MP4_DESCR_COUNT 16
  47
  48 enum MpegTSFilterType {
  49     MPEGTS_PES,
  50     MPEGTS_SECTION,
  51 };
  52
  53 typedef struct MpegTSFilter MpegTSFilter;
  54
  55 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
  56
  57 typedef struct MpegTSPESFilter {
  58     PESCallback *pes_cb;
  59     void *opaque;
  60 } MpegTSPESFilter;
  61
  62 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
  63
  64 typedef void SetServiceCallback(void *opaque, int ret);
  65
  66 typedef struct MpegTSSectionFilter {
  67     int section_index;
  68     int section_h_size;
  69     uint8_t *section_buf;
  70     unsigned int check_crc:1;
  71     unsigned int end_of_section_reached:1;
  72     SectionCallback *section_cb;
  73     void *opaque;
  74 } MpegTSSectionFilter;
  75
  76 struct MpegTSFilter {
  77     int pid;
  78     int es_id;
  79     int last_cc; /* last cc code (-1 if first packet) */
  80     enum MpegTSFilterType type;
  81     union {
  82         MpegTSPESFilter pes_filter;
  83         MpegTSSectionFilter section_filter;
  84     } u;
  85 };
  86
  87 #define MAX_PIDS_PER_PROGRAM 64
  88 struct Program {
  89     unsigned int id; //program id/service id
  90     unsigned int nb_pids;
  91     unsigned int pids[MAX_PIDS_PER_PROGRAM];
  92 };
  93
  94 struct MpegTSContext {
  95     const AVClass *class;
  96     /* user data */
  97     AVFormatContext *stream;
  98     /** raw packet size, including FEC if present            */
  99     int raw_packet_size;
 100
 101     int pos47;
 102
 103     /** if true, all pids are analyzed to find streams       */
 104     int auto_guess;
 105
 106     /** compute exact PCR for each transport stream packet   */
 107     int mpeg2ts_compute_pcr;
 108
 109     int64_t cur_pcr;    /**< used to estimate the exact PCR  */
 110     int pcr_incr;       /**< used to estimate the exact PCR  */
 111
 112     /* data needed to handle file based ts */
 113     /** stop parsing loop                                    */
 114     int stop_parse;
 115     /** packet containing Audio/Video data                   */
 116     AVPacket *pkt;
 117     /** to detect seek                                       */
 118     int64_t last_pos;
 119
 120     /******************************************/
 121     /* private mpegts data */
 122     /* scan context */
 123     /** structure to keep track of Program->pids mapping     */
 124     unsigned int nb_prg;
 125     struct Program *prg;
 126
 127
 128     /** filters for various streams specified by PMT + for the PAT and PMT */
 129     MpegTSFilter *pids[NB_PID_MAX];
 130 };
 131
 132 static const AVOption options[] = {
 133     {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
 134      {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
 135     { NULL },
 136 };
 137
 138 static const AVClass mpegtsraw_class = {
 139     .class_name = "mpegtsraw demuxer",
 140     .item_name  = av_default_item_name,
 141     .option     = options,
 142     .version    = LIBAVUTIL_VERSION_INT,
 143 };
 144
 145 /* TS stream handling */
 146
 147 enum MpegTSState {
 148     MPEGTS_HEADER = 0,
 149     MPEGTS_PESHEADER,
 150     MPEGTS_PESHEADER_FILL,
 151     MPEGTS_PAYLOAD,
 152     MPEGTS_SKIP,
 153 };
 154
 155 /* enough for PES header + length */
 156 #define PES_START_SIZE  6
 157 #define PES_HEADER_SIZE 9
 158 #define MAX_PES_HEADER_SIZE (9 + 255)
 159
 160 typedef struct PESContext {
 161     int pid;
 162     int pcr_pid; /**< if -1 then all packets containing PCR are considered */
 163     int stream_type;
 164     MpegTSContext *ts;
 165     AVFormatContext *stream;
 166     AVStream *st;
 167     AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
 168     enum MpegTSState state;
 169     /* used to get the format */
 170     int data_index;
 171     int flags; /**< copied to the AVPacket flags */
 172     int total_size;
 173     int pes_header_size;
 174     int extended_stream_id;
 175     int64_t pts, dts;
 176     int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
 177     uint8_t header[MAX_PES_HEADER_SIZE];
 178     uint8_t *buffer;
 179     SLConfigDescr sl;
 180 } PESContext;
 181
 182 extern AVInputFormat ff_mpegts_demuxer;
 183
 184 static void clear_program(MpegTSContext *ts, unsigned int programid)
 185 {
 186     int i;
 187
 188     for(i=0; i<ts->nb_prg; i++)
 189         if(ts->prg[i].id == programid)
 190             ts->prg[i].nb_pids = 0;
 191 }
 192
 193 static void clear_programs(MpegTSContext *ts)
 194 {
 195     av_freep(&ts->prg);
 196     ts->nb_prg=0;
 197 }
 198
 199 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
 200 {
 201     struct Program *p;
 202     void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
 203     if(!tmp)
 204         return;
 205     ts->prg = tmp;
 206     p = &ts->prg[ts->nb_prg];
 207     p->id = programid;
 208     p->nb_pids = 0;
 209     ts->nb_prg++;
 210 }
 211
 212 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
 213 {
 214     int i;
 215     struct Program *p = NULL;
 216     for(i=0; i<ts->nb_prg; i++) {
 217         if(ts->prg[i].id == programid) {
 218             p = &ts->prg[i];
 219             break;
 220         }
 221     }
 222     if(!p)
 223         return;
 224
 225     if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
 226         return;
 227     p->pids[p->nb_pids++] = pid;
 228 }
 229
 230 /**
 231  * @brief discard_pid() decides if the pid is to be discarded according
 232  *                      to caller's programs selection
 233  * @param ts    : - TS context
 234  * @param pid   : - pid
 235  * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
 236  *         0 otherwise
 237  */
 238 static int discard_pid(MpegTSContext *ts, unsigned int pid)
 239 {
 240     int i, j, k;
 241     int used = 0, discarded = 0;
 242     struct Program *p;
 243     for(i=0; i<ts->nb_prg; i++) {
 244         p = &ts->prg[i];
 245         for(j=0; j<p->nb_pids; j++) {
 246             if(p->pids[j] != pid)
 247                 continue;
 248             //is program with id p->id set to be discarded?
 249             for(k=0; k<ts->stream->nb_programs; k++) {
 250                 if(ts->stream->programs[k]->id == p->id) {
 251                     if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
 252                         discarded++;
 253                     else
 254                         used++;
 255                 }
 256             }
 257         }
 258     }
 259
 260     return !used && discarded;
 261 }
 262
 263 /**
 264  *  Assemble PES packets out of TS packets, and then call the "section_cb"
 265  *  function when they are complete.
 266  */
 267 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
 268                                const uint8_t *buf, int buf_size, int is_start)
 269 {
 270     MpegTSSectionFilter *tss = &tss1->u.section_filter;
 271     int len;
 272
 273     if (is_start) {
 274         memcpy(tss->section_buf, buf, buf_size);
 275         tss->section_index = buf_size;
 276         tss->section_h_size = -1;
 277         tss->end_of_section_reached = 0;
 278     } else {
 279         if (tss->end_of_section_reached)
 280             return;
 281         len = 4096 - tss->section_index;
 282         if (buf_size < len)
 283             len = buf_size;
 284         memcpy(tss->section_buf + tss->section_index, buf, len);
 285         tss->section_index += len;
 286     }
 287
 288     /* compute section length if possible */
 289     if (tss->section_h_size == -1 && tss->section_index >= 3) {
 290         len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
 291         if (len > 4096)
 292             return;
 293         tss->section_h_size = len;
 294     }
 295
 296     if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
 297         tss->end_of_section_reached = 1;
 298         if (!tss->check_crc ||
 299             av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
 300                    tss->section_buf, tss->section_h_size) == 0)
 301             tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
 302     }
 303 }
 304
 305 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
 306                                          SectionCallback *section_cb, void *opaque,
 307                                          int check_crc)
 308
 309 {
 310     MpegTSFilter *filter;
 311     MpegTSSectionFilter *sec;
 312
 313     av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
 314
 315     if (pid >= NB_PID_MAX || ts->pids[pid])
 316         return NULL;
 317     filter = av_mallocz(sizeof(MpegTSFilter));
 318     if (!filter)
 319         return NULL;
 320     ts->pids[pid] = filter;
 321     filter->type = MPEGTS_SECTION;
 322     filter->pid = pid;
 323     filter->es_id = -1;
 324     filter->last_cc = -1;
 325     sec = &filter->u.section_filter;
 326     sec->section_cb = section_cb;
 327     sec->opaque = opaque;
 328     sec->section_buf = av_malloc(MAX_SECTION_SIZE);
 329     sec->check_crc = check_crc;
 330     if (!sec->section_buf) {
 331         av_free(filter);
 332         return NULL;
 333     }
 334     return filter;
 335 }
 336
 337 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
 338                                      PESCallback *pes_cb,
 339                                      void *opaque)
 340 {
 341     MpegTSFilter *filter;
 342     MpegTSPESFilter *pes;
 343
 344     if (pid >= NB_PID_MAX || ts->pids[pid])
 345         return NULL;
 346     filter = av_mallocz(sizeof(MpegTSFilter));
 347     if (!filter)
 348         return NULL;
 349     ts->pids[pid] = filter;
 350     filter->type = MPEGTS_PES;
 351     filter->pid = pid;
 352     filter->es_id = -1;
 353     filter->last_cc = -1;
 354     pes = &filter->u.pes_filter;
 355     pes->pes_cb = pes_cb;
 356     pes->opaque = opaque;
 357     return filter;
 358 }
 359
 360 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
 361 {
 362     int pid;
 363
 364     pid = filter->pid;
 365     if (filter->type == MPEGTS_SECTION)
 366         av_freep(&filter->u.section_filter.section_buf);
 367     else if (filter->type == MPEGTS_PES) {
 368         PESContext *pes = filter->u.pes_filter.opaque;
 369         av_freep(&pes->buffer);
 370         /* referenced private data will be freed later in
 371          * av_close_input_stream */
 372         if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
 373             av_freep(&filter->u.pes_filter.opaque);
 374         }
 375     }
 376
 377     av_free(filter);
 378     ts->pids[pid] = NULL;
 379 }
 380
 381 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
 382     int stat[TS_MAX_PACKET_SIZE];
 383     int i;
 384     int x=0;
 385     int best_score=0;
 386
 387     memset(stat, 0, packet_size*sizeof(int));
 388
 389     for(x=i=0; i<size-3; i++){
 390         if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
 391             stat[x]++;
 392             if(stat[x] > best_score){
 393                 best_score= stat[x];
 394                 if(index) *index= x;
 395             }
 396         }
 397
 398         x++;
 399         if(x == packet_size) x= 0;
 400     }
 401
 402     return best_score;
 403 }
 404
 405 /* autodetect fec presence. Must have at least 1024 bytes  */
 406 static int get_packet_size(const uint8_t *buf, int size)
 407 {
 408     int score, fec_score, dvhs_score;
 409
 410     if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
 411         return -1;
 412
 413     score    = analyze(buf, size, TS_PACKET_SIZE, NULL);
 414     dvhs_score    = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
 415     fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
 416 //    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
 417
 418     if     (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
 419     else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
 420     else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
 421     else                       return -1;
 422 }
 423
 424 typedef struct SectionHeader {
 425     uint8_t tid;
 426     uint16_t id;
 427     uint8_t version;
 428     uint8_t sec_num;
 429     uint8_t last_sec_num;
 430 } SectionHeader;
 431
 432 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
 433 {
 434     const uint8_t *p;
 435     int c;
 436
 437     p = *pp;
 438     if (p >= p_end)
 439         return -1;
 440     c = *p++;
 441     *pp = p;
 442     return c;
 443 }
 444
 445 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
 446 {
 447     const uint8_t *p;
 448     int c;
 449
 450     p = *pp;
 451     if ((p + 1) >= p_end)
 452         return -1;
 453     c = AV_RB16(p);
 454     p += 2;
 455     *pp = p;
 456     return c;
 457 }
 458
 459 /* read and allocate a DVB string preceded by its length */
 460 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
 461 {
 462     int len;
 463     const uint8_t *p;
 464     char *str;
 465
 466     p = *pp;
 467     len = get8(&p, p_end);
 468     if (len < 0)
 469         return NULL;
 470     if ((p + len) > p_end)
 471         return NULL;
 472     str = av_malloc(len + 1);
 473     if (!str)
 474         return NULL;
 475     memcpy(str, p, len);
 476     str[len] = '\0';
 477     p += len;
 478     *pp = p;
 479     return str;
 480 }
 481
 482 static int parse_section_header(SectionHeader *h,
 483                                 const uint8_t **pp, const uint8_t *p_end)
 484 {
 485     int val;
 486
 487     val = get8(pp, p_end);
 488     if (val < 0)
 489         return -1;
 490     h->tid = val;
 491     *pp += 2;
 492     val = get16(pp, p_end);
 493     if (val < 0)
 494         return -1;
 495     h->id = val;
 496     val = get8(pp, p_end);
 497     if (val < 0)
 498         return -1;
 499     h->version = (val >> 1) & 0x1f;
 500     val = get8(pp, p_end);
 501     if (val < 0)
 502         return -1;
 503     h->sec_num = val;
 504     val = get8(pp, p_end);
 505     if (val < 0)
 506         return -1;
 507     h->last_sec_num = val;
 508     return 0;
 509 }
 510
 511 typedef struct {
 512     uint32_t stream_type;
 513     enum AVMediaType codec_type;
 514     enum CodecID codec_id;
 515 } StreamType;
 516
 517 static const StreamType ISO_types[] = {
 518     { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
 519     { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
 520     { 0x03, AVMEDIA_TYPE_AUDIO,        CODEC_ID_MP3 },
 521     { 0x04, AVMEDIA_TYPE_AUDIO,        CODEC_ID_MP3 },
 522     { 0x0f, AVMEDIA_TYPE_AUDIO,        CODEC_ID_AAC },
 523     { 0x10, AVMEDIA_TYPE_VIDEO,      CODEC_ID_MPEG4 },
 524     { 0x11, AVMEDIA_TYPE_AUDIO,   CODEC_ID_AAC_LATM }, /* LATM syntax */
 525     { 0x1b, AVMEDIA_TYPE_VIDEO,       CODEC_ID_H264 },
 526     { 0xd1, AVMEDIA_TYPE_VIDEO,      CODEC_ID_DIRAC },
 527     { 0xea, AVMEDIA_TYPE_VIDEO,        CODEC_ID_VC1 },
 528     { 0 },
 529 };
 530
 531 static const StreamType HDMV_types[] = {
 532     { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
 533     { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
 534     { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
 535     { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
 536     { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
 537     { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
 538     { 0 },
 539 };
 540
 541 /* ATSC ? */
 542 static const StreamType MISC_types[] = {
 543     { 0x81, AVMEDIA_TYPE_AUDIO,   CODEC_ID_AC3 },
 544     { 0x8a, AVMEDIA_TYPE_AUDIO,   CODEC_ID_DTS },
 545     { 0 },
 546 };
 547
 548 static const StreamType REGD_types[] = {
 549     { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
 550     { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO,   CODEC_ID_AC3 },
 551     { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
 552     { 0 },
 553 };
 554
 555 /* descriptor present */
 556 static const StreamType DESC_types[] = {
 557     { 0x6a, AVMEDIA_TYPE_AUDIO,             CODEC_ID_AC3 }, /* AC-3 descriptor */
 558     { 0x7a, AVMEDIA_TYPE_AUDIO,            CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
 559     { 0x7b, AVMEDIA_TYPE_AUDIO,             CODEC_ID_DTS },
 560     { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
 561     { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
 562     { 0 },
 563 };
 564
 565 static void mpegts_find_stream_type(AVStream *st,
 566                                     uint32_t stream_type, const StreamType *types)
 567 {
 568     for (; types->stream_type; types++) {
 569         if (stream_type == types->stream_type) {
 570             st->codec->codec_type = types->codec_type;
 571             st->codec->codec_id   = types->codec_id;
 572             return;
 573         }
 574     }
 575 }
 576
 577 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
 578                                   uint32_t stream_type, uint32_t prog_reg_desc)
 579 {
 580     avpriv_set_pts_info(st, 33, 1, 90000);
 581     st->priv_data = pes;
 582     st->codec->codec_type = AVMEDIA_TYPE_DATA;
 583     st->codec->codec_id   = CODEC_ID_NONE;
 584     st->need_parsing = AVSTREAM_PARSE_FULL;
 585     pes->st = st;
 586     pes->stream_type = stream_type;
 587
 588     av_log(pes->stream, AV_LOG_DEBUG,
 589            "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
 590            st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
 591
 592     st->codec->codec_tag = pes->stream_type;
 593
 594     mpegts_find_stream_type(st, pes->stream_type, ISO_types);
 595     if (prog_reg_desc == AV_RL32("HDMV") &&
 596         st->codec->codec_id == CODEC_ID_NONE) {
 597         mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
 598         if (pes->stream_type == 0x83) {
 599             // HDMV TrueHD streams also contain an AC3 coded version of the
 600             // audio track - add a second stream for this
 601             AVStream *sub_st;
 602             // priv_data cannot be shared between streams
 603             PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
 604             if (!sub_pes)
 605                 return AVERROR(ENOMEM);
 606             memcpy(sub_pes, pes, sizeof(*sub_pes));
 607
 608             sub_st = avformat_new_stream(pes->stream, NULL);
 609             if (!sub_st) {
 610                 av_free(sub_pes);
 611                 return AVERROR(ENOMEM);
 612             }
 613
 614             sub_st->id = pes->pid;
 615             avpriv_set_pts_info(sub_st, 33, 1, 90000);
 616             sub_st->priv_data = sub_pes;
 617             sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 618             sub_st->codec->codec_id   = CODEC_ID_AC3;
 619             sub_st->need_parsing = AVSTREAM_PARSE_FULL;
 620             sub_pes->sub_st = pes->sub_st = sub_st;
 621         }
 622     }
 623     if (st->codec->codec_id == CODEC_ID_NONE)
 624         mpegts_find_stream_type(st, pes->stream_type, MISC_types);
 625
 626     return 0;
 627 }
 628
 629 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
 630 {
 631     av_init_packet(pkt);
 632
 633     pkt->destruct = av_destruct_packet;
 634     pkt->data = pes->buffer;
 635     pkt->size = pes->data_index;
 636
 637     if(pes->total_size != MAX_PES_PAYLOAD &&
 638        pes->pes_header_size + pes->data_index != pes->total_size + 6) {
 639         av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
 640         pes->flags |= AV_PKT_FLAG_CORRUPT;
 641     }
 642     memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 643
 644     // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
 645     if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
 646         pkt->stream_index = pes->sub_st->index;
 647     else
 648         pkt->stream_index = pes->st->index;
 649     pkt->pts = pes->pts;
 650     pkt->dts = pes->dts;
 651     /* store position of first TS packet of this PES packet */
 652     pkt->pos = pes->ts_packet_pos;
 653     pkt->flags = pes->flags;
 654
 655     /* reset pts values */
 656     pes->pts = AV_NOPTS_VALUE;
 657     pes->dts = AV_NOPTS_VALUE;
 658     pes->buffer = NULL;
 659     pes->data_index = 0;
 660     pes->flags = 0;
 661 }
 662
 663 static uint64_t get_bits64(GetBitContext *gb, int bits)
 664 {
 665     uint64_t ret = 0;
 666     while (bits > 17) {
 667         ret <<= 17;
 668         ret |= get_bits(gb, 17);
 669         bits -= 17;
 670     }
 671     ret <<= bits;
 672     ret |= get_bits(gb, bits);
 673     return ret;
 674 }
 675
 676 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
 677 {
 678     GetBitContext gb;
 679     int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
 680     int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
 681     int dts_flag = -1, cts_flag = -1;
 682     int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
 683     init_get_bits(&gb, buf, buf_size*8);
 684
 685     if (sl->use_au_start)
 686         au_start_flag = get_bits1(&gb);
 687     if (sl->use_au_end)
 688         au_end_flag = get_bits1(&gb);
 689     if (!sl->use_au_start && !sl->use_au_end)
 690         au_start_flag = au_end_flag = 1;
 691     if (sl->ocr_len > 0)
 692         ocr_flag = get_bits1(&gb);
 693     if (sl->use_idle)
 694         idle_flag = get_bits1(&gb);
 695     if (sl->use_padding)
 696         padding_flag = get_bits1(&gb);
 697     if (padding_flag)
 698         padding_bits = get_bits(&gb, 3);
 699
 700     if (!idle_flag && (!padding_flag || padding_bits != 0)) {
 701         if (sl->packet_seq_num_len)
 702             skip_bits_long(&gb, sl->packet_seq_num_len);
 703         if (sl->degr_prior_len)
 704             if (get_bits1(&gb))
 705                 skip_bits(&gb, sl->degr_prior_len);
 706         if (ocr_flag)
 707             skip_bits_long(&gb, sl->ocr_len);
 708         if (au_start_flag) {
 709             if (sl->use_rand_acc_pt)
 710                 get_bits1(&gb);
 711             if (sl->au_seq_num_len > 0)
 712                 skip_bits_long(&gb, sl->au_seq_num_len);
 713             if (sl->use_timestamps) {
 714                 dts_flag = get_bits1(&gb);
 715                 cts_flag = get_bits1(&gb);
 716             }
 717         }
 718         if (sl->inst_bitrate_len)
 719             inst_bitrate_flag = get_bits1(&gb);
 720         if (dts_flag == 1)
 721             dts = get_bits64(&gb, sl->timestamp_len);
 722         if (cts_flag == 1)
 723             cts = get_bits64(&gb, sl->timestamp_len);
 724         if (sl->au_len > 0)
 725             skip_bits_long(&gb, sl->au_len);
 726         if (inst_bitrate_flag)
 727             skip_bits_long(&gb, sl->inst_bitrate_len);
 728     }
 729
 730     if (dts != AV_NOPTS_VALUE)
 731         pes->dts = dts;
 732     if (cts != AV_NOPTS_VALUE)
 733         pes->pts = cts;
 734
 735     avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
 736
 737     return (get_bits_count(&gb) + 7) >> 3;
 738 }
 739
 740 /* return non zero if a packet could be constructed */
 741 static int mpegts_push_data(MpegTSFilter *filter,
 742                             const uint8_t *buf, int buf_size, int is_start,
 743                             int64_t pos)
 744 {
 745     PESContext *pes = filter->u.pes_filter.opaque;
 746     MpegTSContext *ts = pes->ts;
 747     const uint8_t *p;
 748     int len, code;
 749
 750     if(!ts->pkt)
 751         return 0;
 752
 753     if (is_start) {
 754         if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
 755             new_pes_packet(pes, ts->pkt);
 756             ts->stop_parse = 1;
 757         }
 758         pes->state = MPEGTS_HEADER;
 759         pes->data_index = 0;
 760         pes->ts_packet_pos = pos;
 761     }
 762     p = buf;
 763     while (buf_size > 0) {
 764         switch(pes->state) {
 765         case MPEGTS_HEADER:
 766             len = PES_START_SIZE - pes->data_index;
 767             if (len > buf_size)
 768                 len = buf_size;
 769             memcpy(pes->header + pes->data_index, p, len);
 770             pes->data_index += len;
 771             p += len;
 772             buf_size -= len;
 773             if (pes->data_index == PES_START_SIZE) {
 774                 /* we got all the PES or section header. We can now
 775                    decide */
 776                 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
 777                     pes->header[2] == 0x01) {
 778                     /* it must be an mpeg2 PES stream */
 779                     code = pes->header[3] | 0x100;
 780                     av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
 781
 782                     if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
 783                         code == 0x1be) /* padding_stream */
 784                         goto skip;
 785
 786                     /* stream not present in PMT */
 787                     if (!pes->st) {
 788                         pes->st = avformat_new_stream(ts->stream, NULL);
 789                         if (!pes->st)
 790                             return AVERROR(ENOMEM);
 791                         pes->st->id = pes->pid;
 792                         mpegts_set_stream_info(pes->st, pes, 0, 0);
 793                     }
 794
 795                     pes->total_size = AV_RB16(pes->header + 4);
 796                     /* NOTE: a zero total size means the PES size is
 797                        unbounded */
 798                     if (!pes->total_size)
 799                         pes->total_size = MAX_PES_PAYLOAD;
 800
 801                     /* allocate pes buffer */
 802                     pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
 803                     if (!pes->buffer)
 804                         return AVERROR(ENOMEM);
 805
 806                     if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
 807                         code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
 808                         code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
 809                         code != 0x1f8) {                  /* ITU-T Rec. H.222.1 type E stream */
 810                         pes->state = MPEGTS_PESHEADER;
 811                         if (pes->st->codec->codec_id == CODEC_ID_NONE) {
 812                             av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
 813                                     pes->pid, pes->stream_type);
 814                             pes->st->codec->codec_id = CODEC_ID_PROBE;
 815                         }
 816                     } else {
 817                         pes->state = MPEGTS_PAYLOAD;
 818                         pes->data_index = 0;
 819                     }
 820                 } else {
 821                     /* otherwise, it should be a table */
 822                     /* skip packet */
 823                 skip:
 824                     pes->state = MPEGTS_SKIP;
 825                     continue;
 826                 }
 827             }
 828             break;
 829             /**********************************************/
 830             /* PES packing parsing */
 831         case MPEGTS_PESHEADER:
 832             len = PES_HEADER_SIZE - pes->data_index;
 833             if (len < 0)
 834                 return -1;
 835             if (len > buf_size)
 836                 len = buf_size;
 837             memcpy(pes->header + pes->data_index, p, len);
 838             pes->data_index += len;
 839             p += len;
 840             buf_size -= len;
 841             if (pes->data_index == PES_HEADER_SIZE) {
 842                 pes->pes_header_size = pes->header[8] + 9;
 843                 pes->state = MPEGTS_PESHEADER_FILL;
 844             }
 845             break;
 846         case MPEGTS_PESHEADER_FILL:
 847             len = pes->pes_header_size - pes->data_index;
 848             if (len < 0)
 849                 return -1;
 850             if (len > buf_size)
 851                 len = buf_size;
 852             memcpy(pes->header + pes->data_index, p, len);
 853             pes->data_index += len;
 854             p += len;
 855             buf_size -= len;
 856             if (pes->data_index == pes->pes_header_size) {
 857                 const uint8_t *r;
 858                 unsigned int flags, pes_ext, skip;
 859
 860                 flags = pes->header[7];
 861                 r = pes->header + 9;
 862                 pes->pts = AV_NOPTS_VALUE;
 863                 pes->dts = AV_NOPTS_VALUE;
 864                 if ((flags & 0xc0) == 0x80) {
 865                     pes->dts = pes->pts = ff_parse_pes_pts(r);
 866                     r += 5;
 867                 } else if ((flags & 0xc0) == 0xc0) {
 868                     pes->pts = ff_parse_pes_pts(r);
 869                     r += 5;
 870                     pes->dts = ff_parse_pes_pts(r);
 871                     r += 5;
 872                 }
 873                 pes->extended_stream_id = -1;
 874                 if (flags & 0x01) { /* PES extension */
 875                     pes_ext = *r++;
 876                     /* Skip PES private data, program packet sequence counter and P-STD buffer */
 877                     skip = (pes_ext >> 4) & 0xb;
 878                     skip += skip & 0x9;
 879                     r += skip;
 880                     if ((pes_ext & 0x41) == 0x01 &&
 881                         (r + 2) <= (pes->header + pes->pes_header_size)) {
 882                         /* PES extension 2 */
 883                         if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
 884                             pes->extended_stream_id = r[1];
 885                     }
 886                 }
 887
 888                 /* we got the full header. We parse it and get the payload */
 889                 pes->state = MPEGTS_PAYLOAD;
 890                 pes->data_index = 0;
 891                 if (pes->stream_type == 0x12) {
 892                     int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
 893                     pes->pes_header_size += sl_header_bytes;
 894                     p += sl_header_bytes;
 895                     buf_size -= sl_header_bytes;
 896                 }
 897             }
 898             break;
 899         case MPEGTS_PAYLOAD:
 900             if (buf_size > 0 && pes->buffer) {
 901                 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
 902                     new_pes_packet(pes, ts->pkt);
 903                     pes->total_size = MAX_PES_PAYLOAD;
 904                     pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
 905                     if (!pes->buffer)
 906                         return AVERROR(ENOMEM);
 907                     ts->stop_parse = 1;
 908                 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
 909                     // pes packet size is < ts size packet and pes data is padded with 0xff
 910                     // not sure if this is legal in ts but see issue #2392
 911                     buf_size = pes->total_size;
 912                 }
 913                 memcpy(pes->buffer+pes->data_index, p, buf_size);
 914                 pes->data_index += buf_size;
 915             }
 916             buf_size = 0;
 917             /* emit complete packets with known packet size
 918              * decreases demuxer delay for infrequent packets like subtitles from
 919              * a couple of seconds to milliseconds for properly muxed files.
 920              * total_size is the number of bytes following pes_packet_length
 921              * in the pes header, i.e. not counting the first 6 bytes */
 922             if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
 923                 pes->pes_header_size + pes->data_index == pes->total_size + 6) {
 924                 ts->stop_parse = 1;
 925                 new_pes_packet(pes, ts->pkt);
 926             }
 927             break;
 928         case MPEGTS_SKIP:
 929             buf_size = 0;
 930             break;
 931         }
 932     }
 933
 934     return 0;
 935 }
 936
 937 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
 938 {
 939     MpegTSFilter *tss;
 940     PESContext *pes;
 941
 942     /* if no pid found, then add a pid context */
 943     pes = av_mallocz(sizeof(PESContext));
 944     if (!pes)
 945         return 0;
 946     pes->ts = ts;
 947     pes->stream = ts->stream;
 948     pes->pid = pid;
 949     pes->pcr_pid = pcr_pid;
 950     pes->state = MPEGTS_SKIP;
 951     pes->pts = AV_NOPTS_VALUE;
 952     pes->dts = AV_NOPTS_VALUE;
 953     tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
 954     if (!tss) {
 955         av_free(pes);
 956         return 0;
 957     }
 958     return pes;
 959 }
 960
 961 #define MAX_LEVEL 4
 962 typedef struct {
 963     AVFormatContext *s;
 964     AVIOContext pb;
 965     Mp4Descr *descr;
 966     Mp4Descr *active_descr;
 967     int descr_count;
 968     int max_descr_count;
 969     int level;
 970 } MP4DescrParseContext;
 971
 972 static int init_MP4DescrParseContext(
 973     MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
 974     unsigned size, Mp4Descr *descr, int max_descr_count)
 975 {
 976     int ret;
 977     if (size > (1<<30))
 978         return AVERROR_INVALIDDATA;
 979
 980     if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
 981                           NULL, NULL, NULL, NULL)) < 0)
 982         return ret;
 983
 984     d->s = s;
 985     d->level = 0;
 986     d->descr_count = 0;
 987     d->descr = descr;
 988     d->active_descr = NULL;
 989     d->max_descr_count = max_descr_count;
 990
 991     return 0;
 992 }
 993
 994 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
 995     int64_t new_off = avio_tell(pb);
 996     (*len) -= new_off - *off;
 997     *off = new_off;
 998 }
 999
1000 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1001                            int target_tag);
1002
1003 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1004 {
1005     while (len > 0) {
1006         if (parse_mp4_descr(d, off, len, 0) < 0)
1007             return -1;
1008         update_offsets(&d->pb, &off, &len);
1009     }
1010     return 0;
1011 }
1012
1013 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1014 {
1015     avio_rb16(&d->pb); // ID
1016     avio_r8(&d->pb);
1017     avio_r8(&d->pb);
1018     avio_r8(&d->pb);
1019     avio_r8(&d->pb);
1020     avio_r8(&d->pb);
1021     update_offsets(&d->pb, &off, &len);
1022     return parse_mp4_descr_arr(d, off, len);
1023 }
1024
1025 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1026 {
1027     int id_flags;
1028     if (len < 2)
1029         return 0;
1030     id_flags = avio_rb16(&d->pb);
1031     if (!(id_flags & 0x0020)) { //URL_Flag
1032         update_offsets(&d->pb, &off, &len);
1033         return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1034     } else {
1035         return 0;
1036     }
1037 }
1038
1039 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1040 {
1041     int es_id = 0;
1042     if (d->descr_count >= d->max_descr_count)
1043         return -1;
1044     ff_mp4_parse_es_descr(&d->pb, &es_id);
1045     d->active_descr = d->descr + (d->descr_count++);
1046
1047     d->active_descr->es_id = es_id;
1048     update_offsets(&d->pb, &off, &len);
1049     parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1050     update_offsets(&d->pb, &off, &len);
1051     if (len > 0)
1052         parse_mp4_descr(d, off, len, MP4SLDescrTag);
1053     d->active_descr = NULL;
1054     return 0;
1055 }
1056
1057 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1058 {
1059     Mp4Descr *descr = d->active_descr;
1060     if (!descr)
1061         return -1;
1062     d->active_descr->dec_config_descr = av_malloc(len);
1063     if (!descr->dec_config_descr)
1064         return AVERROR(ENOMEM);
1065     descr->dec_config_descr_len = len;
1066     avio_read(&d->pb, descr->dec_config_descr, len);
1067     return 0;
1068 }
1069
1070 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1071 {
1072     Mp4Descr *descr = d->active_descr;
1073     int predefined;
1074     if (!descr)
1075         return -1;
1076
1077     predefined = avio_r8(&d->pb);
1078     if (!predefined) {
1079         int lengths;
1080         int flags = avio_r8(&d->pb);
1081         descr->sl.use_au_start       = !!(flags & 0x80);
1082         descr->sl.use_au_end         = !!(flags & 0x40);
1083         descr->sl.use_rand_acc_pt    = !!(flags & 0x20);
1084         descr->sl.use_padding        = !!(flags & 0x08);
1085         descr->sl.use_timestamps     = !!(flags & 0x04);
1086         descr->sl.use_idle           = !!(flags & 0x02);
1087         descr->sl.timestamp_res      = avio_rb32(&d->pb);
1088                                        avio_rb32(&d->pb);
1089         descr->sl.timestamp_len      = avio_r8(&d->pb);
1090         descr->sl.ocr_len            = avio_r8(&d->pb);
1091         descr->sl.au_len             = avio_r8(&d->pb);
1092         descr->sl.inst_bitrate_len   = avio_r8(&d->pb);
1093         lengths                      = avio_rb16(&d->pb);
1094         descr->sl.degr_prior_len     = lengths >> 12;
1095         descr->sl.au_seq_num_len     = (lengths >> 7) & 0x1f;
1096         descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1097     } else {
1098         av_log_missing_feature(d->s, "Predefined SLConfigDescriptor\n", 0);
1099     }
1100     return 0;
1101 }
1102
1103 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1104                            int target_tag) {
1105     int tag;
1106     int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1107     update_offsets(&d->pb, &off, &len);
1108     if (len < 0 || len1 > len || len1 <= 0) {
1109         av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1110         return -1;
1111     }
1112
1113     if (d->level++ >= MAX_LEVEL) {
1114         av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1115         goto done;
1116     }
1117
1118     if (target_tag && tag != target_tag) {
1119         av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1120         goto done;
1121     }
1122
1123     switch (tag) {
1124     case MP4IODescrTag:
1125         parse_MP4IODescrTag(d, off, len1);
1126         break;
1127     case MP4ODescrTag:
1128         parse_MP4ODescrTag(d, off, len1);
1129         break;
1130     case MP4ESDescrTag:
1131         parse_MP4ESDescrTag(d, off, len1);
1132         break;
1133     case MP4DecConfigDescrTag:
1134         parse_MP4DecConfigDescrTag(d, off, len1);
1135         break;
1136     case MP4SLDescrTag:
1137         parse_MP4SLDescrTag(d, off, len1);
1138         break;
1139     }
1140
1141 done:
1142     d->level--;
1143     avio_seek(&d->pb, off + len1, SEEK_SET);
1144     return 0;
1145 }
1146
1147 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1148                          Mp4Descr *descr, int *descr_count, int max_descr_count)
1149 {
1150     MP4DescrParseContext d;
1151     if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1152         return -1;
1153
1154     parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1155
1156     *descr_count = d.descr_count;
1157     return 0;
1158 }
1159
1160 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1161                        Mp4Descr *descr, int *descr_count, int max_descr_count)
1162 {
1163     MP4DescrParseContext d;
1164     if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1165         return -1;
1166
1167     parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1168
1169     *descr_count = d.descr_count;
1170     return 0;
1171 }
1172
1173 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1174 {
1175     MpegTSContext *ts = filter->u.section_filter.opaque;
1176     SectionHeader h;
1177     const uint8_t *p, *p_end;
1178     AVIOContext pb;
1179     Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1180     int mp4_descr_count = 0;
1181     int i, pid;
1182     AVFormatContext *s = ts->stream;
1183
1184     p_end = section + section_len - 4;
1185     p = section;
1186     if (parse_section_header(&h, &p, p_end) < 0)
1187         return;
1188     if (h.tid != M4OD_TID)
1189         return;
1190
1191     mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1192
1193     for (pid = 0; pid < NB_PID_MAX; pid++) {
1194         if (!ts->pids[pid])
1195              continue;
1196         for (i = 0; i < mp4_descr_count; i++) {
1197             PESContext *pes;
1198             AVStream *st;
1199             if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1200                 continue;
1201             if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1202                 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1203                 continue;
1204             }
1205             pes = ts->pids[pid]->u.pes_filter.opaque;
1206             st = pes->st;
1207             if (!st) {
1208                 continue;
1209             }
1210
1211             pes->sl = mp4_descr[i].sl;
1212
1213             ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1214                               mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1215             ff_mp4_read_dec_config_descr(s, st, &pb);
1216             if (st->codec->codec_id == CODEC_ID_AAC &&
1217                 st->codec->extradata_size > 0)
1218                 st->need_parsing = 0;
1219             if (st->codec->codec_id == CODEC_ID_H264 &&
1220                 st->codec->extradata_size > 0)
1221                 st->need_parsing = 0;
1222
1223             if (st->codec->codec_id <= CODEC_ID_NONE) {
1224             } else if (st->codec->codec_id < CODEC_ID_FIRST_AUDIO) {
1225                 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1226             } else if (st->codec->codec_id < CODEC_ID_FIRST_SUBTITLE) {
1227                 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1228             } else if (st->codec->codec_id < CODEC_ID_FIRST_UNKNOWN) {
1229                 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1230             }
1231         }
1232     }
1233     for (i = 0; i < mp4_descr_count; i++)
1234         av_free(mp4_descr[i].dec_config_descr);
1235 }
1236
1237 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1238                               const uint8_t **pp, const uint8_t *desc_list_end,
1239                               Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1240                               MpegTSContext *ts)
1241 {
1242     const uint8_t *desc_end;
1243     int desc_len, desc_tag, desc_es_id;
1244     char language[252];
1245     int i;
1246
1247     desc_tag = get8(pp, desc_list_end);
1248     if (desc_tag < 0)
1249         return -1;
1250     desc_len = get8(pp, desc_list_end);
1251     if (desc_len < 0)
1252         return -1;
1253     desc_end = *pp + desc_len;
1254     if (desc_end > desc_list_end)
1255         return -1;
1256
1257     av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1258
1259     if (st->codec->codec_id == CODEC_ID_NONE &&
1260         stream_type == STREAM_TYPE_PRIVATE_DATA)
1261         mpegts_find_stream_type(st, desc_tag, DESC_types);
1262
1263     switch(desc_tag) {
1264     case 0x1E: /* SL descriptor */
1265         desc_es_id = get16(pp, desc_end);
1266         if (ts && ts->pids[pid])
1267             ts->pids[pid]->es_id = desc_es_id;
1268         for (i = 0; i < mp4_descr_count; i++)
1269         if (mp4_descr[i].dec_config_descr_len &&
1270             mp4_descr[i].es_id == desc_es_id) {
1271             AVIOContext pb;
1272             ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1273                           mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1274             ff_mp4_read_dec_config_descr(fc, st, &pb);
1275             if (st->codec->codec_id == CODEC_ID_AAC &&
1276                 st->codec->extradata_size > 0)
1277                 st->need_parsing = 0;
1278             if (st->codec->codec_id == CODEC_ID_MPEG4SYSTEMS)
1279                 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1280         }
1281         break;
1282     case 0x1F: /* FMC descriptor */
1283         get16(pp, desc_end);
1284         if (mp4_descr_count > 0 && st->codec->codec_id == CODEC_ID_AAC_LATM &&
1285             mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1286             AVIOContext pb;
1287             ffio_init_context(&pb, mp4_descr->dec_config_descr,
1288                           mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1289             ff_mp4_read_dec_config_descr(fc, st, &pb);
1290             if (st->codec->codec_id == CODEC_ID_AAC &&
1291                 st->codec->extradata_size > 0)
1292                 st->need_parsing = 0;
1293         }
1294         break;
1295     case 0x56: /* DVB teletext descriptor */
1296         language[0] = get8(pp, desc_end);
1297         language[1] = get8(pp, desc_end);
1298         language[2] = get8(pp, desc_end);
1299         language[3] = 0;
1300         av_dict_set(&st->metadata, "language", language, 0);
1301         break;
1302     case 0x59: /* subtitling descriptor */
1303         language[0] = get8(pp, desc_end);
1304         language[1] = get8(pp, desc_end);
1305         language[2] = get8(pp, desc_end);
1306         language[3] = 0;
1307         /* hearing impaired subtitles detection */
1308         switch(get8(pp, desc_end)) {
1309         case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1310         case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1311         case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1312         case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1313         case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1314         case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1315             st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1316             break;
1317         }
1318         if (st->codec->extradata) {
1319             if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1320                 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1321         } else {
1322             st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1323             if (st->codec->extradata) {
1324                 st->codec->extradata_size = 4;
1325                 memcpy(st->codec->extradata, *pp, 4);
1326             }
1327         }
1328         *pp += 4;
1329         av_dict_set(&st->metadata, "language", language, 0);
1330         break;
1331     case 0x0a: /* ISO 639 language descriptor */
1332         for (i = 0; i + 4 <= desc_len; i += 4) {
1333             language[i + 0] = get8(pp, desc_end);
1334             language[i + 1] = get8(pp, desc_end);
1335             language[i + 2] = get8(pp, desc_end);
1336             language[i + 3] = ',';
1337         switch (get8(pp, desc_end)) {
1338             case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1339             case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1340             case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1341         }
1342         }
1343         if (i) {
1344             language[i - 1] = 0;
1345             av_dict_set(&st->metadata, "language", language, 0);
1346         }
1347         break;
1348     case 0x05: /* registration descriptor */
1349         st->codec->codec_tag = bytestream_get_le32(pp);
1350         av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1351         if (st->codec->codec_id == CODEC_ID_NONE &&
1352             stream_type == STREAM_TYPE_PRIVATE_DATA)
1353             mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1354         break;
1355     default:
1356         break;
1357     }
1358     *pp = desc_end;
1359     return 0;
1360 }
1361
1362 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1363 {
1364     MpegTSContext *ts = filter->u.section_filter.opaque;
1365     SectionHeader h1, *h = &h1;
1366     PESContext *pes;
1367     AVStream *st;
1368     const uint8_t *p, *p_end, *desc_list_end;
1369     int program_info_length, pcr_pid, pid, stream_type;
1370     int desc_list_len;
1371     uint32_t prog_reg_desc = 0; /* registration descriptor */
1372
1373     Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1374     int mp4_descr_count = 0;
1375     int i;
1376
1377     av_dlog(ts->stream, "PMT: len %i\n", section_len);
1378     hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1379
1380     p_end = section + section_len - 4;
1381     p = section;
1382     if (parse_section_header(h, &p, p_end) < 0)
1383         return;
1384
1385     av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1386            h->id, h->sec_num, h->last_sec_num);
1387
1388     if (h->tid != PMT_TID)
1389         return;
1390
1391     clear_program(ts, h->id);
1392     pcr_pid = get16(&p, p_end) & 0x1fff;
1393     if (pcr_pid < 0)
1394         return;
1395     add_pid_to_pmt(ts, h->id, pcr_pid);
1396
1397     av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1398
1399     program_info_length = get16(&p, p_end) & 0xfff;
1400     if (program_info_length < 0)
1401         return;
1402     while(program_info_length >= 2) {
1403         uint8_t tag, len;
1404         tag = get8(&p, p_end);
1405         len = get8(&p, p_end);
1406
1407         av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1408
1409         if(len > program_info_length - 2)
1410             //something else is broken, exit the program_descriptors_loop
1411             break;
1412         program_info_length -= len + 2;
1413         if (tag == 0x1d) { // IOD descriptor
1414             get8(&p, p_end); // scope
1415             get8(&p, p_end); // label
1416             len -= 2;
1417             mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1418                           &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1419         } else if (tag == 0x05 && len >= 4) { // registration descriptor
1420             prog_reg_desc = bytestream_get_le32(&p);
1421             len -= 4;
1422         }
1423         p += len;
1424     }
1425     p += program_info_length;
1426     if (p >= p_end)
1427         goto out;
1428
1429     // stop parsing after pmt, we found header
1430     if (!ts->stream->nb_streams)
1431         ts->stop_parse = 1;
1432
1433     for(;;) {
1434         st = 0;
1435         pes = NULL;
1436         stream_type = get8(&p, p_end);
1437         if (stream_type < 0)
1438             break;
1439         pid = get16(&p, p_end) & 0x1fff;
1440         if (pid < 0)
1441             break;
1442
1443         /* now create stream */
1444         if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1445             pes = ts->pids[pid]->u.pes_filter.opaque;
1446             if (!pes->st) {
1447                 pes->st = avformat_new_stream(pes->stream, NULL);
1448                 pes->st->id = pes->pid;
1449             }
1450             st = pes->st;
1451         } else if (stream_type != 0x13) {
1452             if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1453             pes = add_pes_stream(ts, pid, pcr_pid);
1454             if (pes) {
1455                 st = avformat_new_stream(pes->stream, NULL);
1456                 st->id = pes->pid;
1457             }
1458         } else {
1459             int idx = ff_find_stream_index(ts->stream, pid);
1460             if (idx >= 0) {
1461                 st = ts->stream->streams[idx];
1462             } else {
1463                 st = avformat_new_stream(pes->stream, NULL);
1464                 st->id = pid;
1465                 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1466             }
1467         }
1468
1469         if (!st)
1470             goto out;
1471
1472         if (pes && !pes->stream_type)
1473             mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1474
1475         add_pid_to_pmt(ts, h->id, pid);
1476
1477         ff_program_add_stream_index(ts->stream, h->id, st->index);
1478
1479         desc_list_len = get16(&p, p_end) & 0xfff;
1480         if (desc_list_len < 0)
1481             break;
1482         desc_list_end = p + desc_list_len;
1483         if (desc_list_end > p_end)
1484             break;
1485         for(;;) {
1486             if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1487                 mp4_descr, mp4_descr_count, pid, ts) < 0)
1488                 break;
1489
1490             if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1491                 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1492                 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1493             }
1494         }
1495         p = desc_list_end;
1496     }
1497
1498  out:
1499     for (i = 0; i < mp4_descr_count; i++)
1500         av_free(mp4_descr[i].dec_config_descr);
1501 }
1502
1503 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1504 {
1505     MpegTSContext *ts = filter->u.section_filter.opaque;
1506     SectionHeader h1, *h = &h1;
1507     const uint8_t *p, *p_end;
1508     int sid, pmt_pid;
1509
1510     av_dlog(ts->stream, "PAT:\n");
1511     hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1512
1513     p_end = section + section_len - 4;
1514     p = section;
1515     if (parse_section_header(h, &p, p_end) < 0)
1516         return;
1517     if (h->tid != PAT_TID)
1518         return;
1519
1520     clear_programs(ts);
1521     for(;;) {
1522         sid = get16(&p, p_end);
1523         if (sid < 0)
1524             break;
1525         pmt_pid = get16(&p, p_end) & 0x1fff;
1526         if (pmt_pid < 0)
1527             break;
1528
1529         av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1530
1531         if (sid == 0x0000) {
1532             /* NIT info */
1533         } else {
1534             av_new_program(ts->stream, sid);
1535             if (ts->pids[pmt_pid])
1536                 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1537             mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1538             add_pat_entry(ts, sid);
1539             add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1540             add_pid_to_pmt(ts, sid, pmt_pid);
1541         }
1542     }
1543 }
1544
1545 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1546 {
1547     MpegTSContext *ts = filter->u.section_filter.opaque;
1548     SectionHeader h1, *h = &h1;
1549     const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1550     int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1551     char *name, *provider_name;
1552
1553     av_dlog(ts->stream, "SDT:\n");
1554     hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1555
1556     p_end = section + section_len - 4;
1557     p = section;
1558     if (parse_section_header(h, &p, p_end) < 0)
1559         return;
1560     if (h->tid != SDT_TID)
1561         return;
1562     onid = get16(&p, p_end);
1563     if (onid < 0)
1564         return;
1565     val = get8(&p, p_end);
1566     if (val < 0)
1567         return;
1568     for(;;) {
1569         sid = get16(&p, p_end);
1570         if (sid < 0)
1571             break;
1572         val = get8(&p, p_end);
1573         if (val < 0)
1574             break;
1575         desc_list_len = get16(&p, p_end) & 0xfff;
1576         if (desc_list_len < 0)
1577             break;
1578         desc_list_end = p + desc_list_len;
1579         if (desc_list_end > p_end)
1580             break;
1581         for(;;) {
1582             desc_tag = get8(&p, desc_list_end);
1583             if (desc_tag < 0)
1584                 break;
1585             desc_len = get8(&p, desc_list_end);
1586             desc_end = p + desc_len;
1587             if (desc_end > desc_list_end)
1588                 break;
1589
1590             av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1591                    desc_tag, desc_len);
1592
1593             switch(desc_tag) {
1594             case 0x48:
1595                 service_type = get8(&p, p_end);
1596                 if (service_type < 0)
1597                     break;
1598                 provider_name = getstr8(&p, p_end);
1599                 if (!provider_name)
1600                     break;
1601                 name = getstr8(&p, p_end);
1602                 if (name) {
1603                     AVProgram *program = av_new_program(ts->stream, sid);
1604                     if(program) {
1605                         av_dict_set(&program->metadata, "service_name", name, 0);
1606                         av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1607                     }
1608                 }
1609                 av_free(name);
1610                 av_free(provider_name);
1611                 break;
1612             default:
1613                 break;
1614             }
1615             p = desc_end;
1616         }
1617         p = desc_list_end;
1618     }
1619 }
1620
1621 /* handle one TS packet */
1622 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1623 {
1624     AVFormatContext *s = ts->stream;
1625     MpegTSFilter *tss;
1626     int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1627         has_adaptation, has_payload;
1628     const uint8_t *p, *p_end;
1629     int64_t pos;
1630
1631     pid = AV_RB16(packet + 1) & 0x1fff;
1632     if(pid && discard_pid(ts, pid))
1633         return 0;
1634     is_start = packet[1] & 0x40;
1635     tss = ts->pids[pid];
1636     if (ts->auto_guess && tss == NULL && is_start) {
1637         add_pes_stream(ts, pid, -1);
1638         tss = ts->pids[pid];
1639     }
1640     if (!tss)
1641         return 0;
1642
1643     afc = (packet[3] >> 4) & 3;
1644     if (afc == 0) /* reserved value */
1645         return 0;
1646     has_adaptation = afc & 2;
1647     has_payload = afc & 1;
1648     is_discontinuity = has_adaptation
1649                 && packet[4] != 0 /* with length > 0 */
1650                 && (packet[5] & 0x80); /* and discontinuity indicated */
1651
1652     /* continuity check (currently not used) */
1653     cc = (packet[3] & 0xf);
1654     expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1655     cc_ok = pid == 0x1FFF // null packet PID
1656             || is_discontinuity
1657             || tss->last_cc < 0
1658             || expected_cc == cc;
1659
1660     tss->last_cc = cc;
1661     if (!cc_ok) {
1662         av_log(ts->stream, AV_LOG_WARNING,
1663                "Continuity check failed for pid %d expected %d got %d\n",
1664                pid, expected_cc, cc);
1665         if(tss->type == MPEGTS_PES) {
1666             PESContext *pc = tss->u.pes_filter.opaque;
1667             pc->flags |= AV_PKT_FLAG_CORRUPT;
1668         }
1669     }
1670
1671     if (!has_payload)
1672         return 0;
1673     p = packet + 4;
1674     if (has_adaptation) {
1675         /* skip adaptation field */
1676         p += p[0] + 1;
1677     }
1678     /* if past the end of packet, ignore */
1679     p_end = packet + TS_PACKET_SIZE;
1680     if (p >= p_end)
1681         return 0;
1682
1683     pos = avio_tell(ts->stream->pb);
1684     ts->pos47= pos % ts->raw_packet_size;
1685
1686     if (tss->type == MPEGTS_SECTION) {
1687         if (is_start) {
1688             /* pointer field present */
1689             len = *p++;
1690             if (p + len > p_end)
1691                 return 0;
1692             if (len && cc_ok) {
1693                 /* write remaining section bytes */
1694                 write_section_data(s, tss,
1695                                    p, len, 0);
1696                 /* check whether filter has been closed */
1697                 if (!ts->pids[pid])
1698                     return 0;
1699             }
1700             p += len;
1701             if (p < p_end) {
1702                 write_section_data(s, tss,
1703                                    p, p_end - p, 1);
1704             }
1705         } else {
1706             if (cc_ok) {
1707                 write_section_data(s, tss,
1708                                    p, p_end - p, 0);
1709             }
1710         }
1711     } else {
1712         int ret;
1713         // Note: The position here points actually behind the current packet.
1714         if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1715                                             pos - ts->raw_packet_size)) < 0)
1716             return ret;
1717     }
1718
1719     return 0;
1720 }
1721
1722 /* XXX: try to find a better synchro over several packets (use
1723    get_packet_size() ?) */
1724 static int mpegts_resync(AVFormatContext *s)
1725 {
1726     AVIOContext *pb = s->pb;
1727     int c, i;
1728
1729     for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1730         c = avio_r8(pb);
1731         if (pb->eof_reached)
1732             return -1;
1733         if (c == 0x47) {
1734             avio_seek(pb, -1, SEEK_CUR);
1735             return 0;
1736         }
1737     }
1738     av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1739     /* no sync found */
1740     return -1;
1741 }
1742
1743 /* return -1 if error or EOF. Return 0 if OK. */
1744 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1745 {
1746     AVIOContext *pb = s->pb;
1747     int skip, len;
1748
1749     for(;;) {
1750         len = avio_read(pb, buf, TS_PACKET_SIZE);
1751         if (len != TS_PACKET_SIZE)
1752             return len < 0 ? len : AVERROR_EOF;
1753         /* check packet sync byte */
1754         if (buf[0] != 0x47) {
1755             /* find a new packet start */
1756             avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1757             if (mpegts_resync(s) < 0)
1758                 return AVERROR(EAGAIN);
1759             else
1760                 continue;
1761         } else {
1762             skip = raw_packet_size - TS_PACKET_SIZE;
1763             if (skip > 0)
1764                 avio_skip(pb, skip);
1765             break;
1766         }
1767     }
1768     return 0;
1769 }
1770
1771 static int handle_packets(MpegTSContext *ts, int nb_packets)
1772 {
1773     AVFormatContext *s = ts->stream;
1774     uint8_t packet[TS_PACKET_SIZE];
1775     int packet_num, ret = 0;
1776
1777     if (avio_tell(s->pb) != ts->last_pos) {
1778         int i;
1779         av_dlog(ts->stream, "Skipping after seek\n");
1780         /* seek detected, flush pes buffer */
1781         for (i = 0; i < NB_PID_MAX; i++) {
1782             if (ts->pids[i]) {
1783                 if (ts->pids[i]->type == MPEGTS_PES) {
1784                    PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1785                    av_freep(&pes->buffer);
1786                    pes->data_index = 0;
1787                    pes->state = MPEGTS_SKIP; /* skip until pes header */
1788                 }
1789                 ts->pids[i]->last_cc = -1;
1790             }
1791         }
1792     }
1793
1794     ts->stop_parse = 0;
1795     packet_num = 0;
1796     for(;;) {
1797         if (ts->stop_parse>0)
1798             break;
1799         packet_num++;
1800         if (nb_packets != 0 && packet_num >= nb_packets)
1801             break;
1802         ret = read_packet(s, packet, ts->raw_packet_size);
1803         if (ret != 0)
1804             break;
1805         ret = handle_packet(ts, packet);
1806         if (ret != 0)
1807             break;
1808     }
1809     ts->last_pos = avio_tell(s->pb);
1810     return ret;
1811 }
1812
1813 static int mpegts_probe(AVProbeData *p)
1814 {
1815 #if 1
1816     const int size= p->buf_size;
1817     int score, fec_score, dvhs_score;
1818     int check_count= size / TS_FEC_PACKET_SIZE;
1819 #define CHECK_COUNT 10
1820
1821     if (check_count < CHECK_COUNT)
1822         return -1;
1823
1824     score     = analyze(p->buf, TS_PACKET_SIZE     *check_count, TS_PACKET_SIZE     , NULL)*CHECK_COUNT/check_count;
1825     dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1826     fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1827 //    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1828
1829 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1830     if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;
1831     else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;
1832     else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1833     else                                    return -1;
1834 #else
1835     /* only use the extension for safer guess */
1836     if (av_match_ext(p->filename, "ts"))
1837         return AVPROBE_SCORE_MAX;
1838     else
1839         return 0;
1840 #endif
1841 }
1842
1843 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1844    (-1) if not available */
1845 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1846                      const uint8_t *packet)
1847 {
1848     int afc, len, flags;
1849     const uint8_t *p;
1850     unsigned int v;
1851
1852     afc = (packet[3] >> 4) & 3;
1853     if (afc <= 1)
1854         return -1;
1855     p = packet + 4;
1856     len = p[0];
1857     p++;
1858     if (len == 0)
1859         return -1;
1860     flags = *p++;
1861     len--;
1862     if (!(flags & 0x10))
1863         return -1;
1864     if (len < 6)
1865         return -1;
1866     v = AV_RB32(p);
1867     *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1868     *ppcr_low = ((p[4] & 1) << 8) | p[5];
1869     return 0;
1870 }
1871
1872 static int mpegts_read_header(AVFormatContext *s,
1873                               AVFormatParameters *ap)
1874 {
1875     MpegTSContext *ts = s->priv_data;
1876     AVIOContext *pb = s->pb;
1877     uint8_t buf[5*1024];
1878     int len;
1879     int64_t pos;
1880
1881     /* read the first 1024 bytes to get packet size */
1882     pos = avio_tell(pb);
1883     len = avio_read(pb, buf, sizeof(buf));
1884     if (len != sizeof(buf))
1885         goto fail;
1886     ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1887     if (ts->raw_packet_size <= 0)
1888         goto fail;
1889     ts->stream = s;
1890     ts->auto_guess = 0;
1891
1892     if (s->iformat == &ff_mpegts_demuxer) {
1893         /* normal demux */
1894
1895         /* first do a scan to get all the services */
1896         if (pb->seekable && avio_seek(pb, pos, SEEK_SET) < 0)
1897             av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1898
1899         mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1900
1901         mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1902
1903         handle_packets(ts, s->probesize / ts->raw_packet_size);
1904         /* if could not find service, enable auto_guess */
1905
1906         ts->auto_guess = 1;
1907
1908         av_dlog(ts->stream, "tuning done\n");
1909
1910         s->ctx_flags |= AVFMTCTX_NOHEADER;
1911     } else {
1912         AVStream *st;
1913         int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1914         int64_t pcrs[2], pcr_h;
1915         int packet_count[2];
1916         uint8_t packet[TS_PACKET_SIZE];
1917
1918         /* only read packets */
1919
1920         st = avformat_new_stream(s, NULL);
1921         if (!st)
1922             goto fail;
1923         avpriv_set_pts_info(st, 60, 1, 27000000);
1924         st->codec->codec_type = AVMEDIA_TYPE_DATA;
1925         st->codec->codec_id = CODEC_ID_MPEG2TS;
1926
1927         /* we iterate until we find two PCRs to estimate the bitrate */
1928         pcr_pid = -1;
1929         nb_pcrs = 0;
1930         nb_packets = 0;
1931         for(;;) {
1932             ret = read_packet(s, packet, ts->raw_packet_size);
1933             if (ret < 0)
1934                 return -1;
1935             pid = AV_RB16(packet + 1) & 0x1fff;
1936             if ((pcr_pid == -1 || pcr_pid == pid) &&
1937                 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1938                 pcr_pid = pid;
1939                 packet_count[nb_pcrs] = nb_packets;
1940                 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1941                 nb_pcrs++;
1942                 if (nb_pcrs >= 2)
1943                     break;
1944             }
1945             nb_packets++;
1946         }
1947
1948         /* NOTE1: the bitrate is computed without the FEC */
1949         /* NOTE2: it is only the bitrate of the start of the stream */
1950         ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1951         ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1952         s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1953         st->codec->bit_rate = s->bit_rate;
1954         st->start_time = ts->cur_pcr;
1955         av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1956                 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1957     }
1958
1959     avio_seek(pb, pos, SEEK_SET);
1960     return 0;
1961  fail:
1962     return -1;
1963 }
1964
1965 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1966
1967 static int mpegts_raw_read_packet(AVFormatContext *s,
1968                                   AVPacket *pkt)
1969 {
1970     MpegTSContext *ts = s->priv_data;
1971     int ret, i;
1972     int64_t pcr_h, next_pcr_h, pos;
1973     int pcr_l, next_pcr_l;
1974     uint8_t pcr_buf[12];
1975
1976     if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1977         return AVERROR(ENOMEM);
1978     pkt->pos= avio_tell(s->pb);
1979     ret = read_packet(s, pkt->data, ts->raw_packet_size);
1980     if (ret < 0) {
1981         av_free_packet(pkt);
1982         return ret;
1983     }
1984     if (ts->mpeg2ts_compute_pcr) {
1985         /* compute exact PCR for each packet */
1986         if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1987             /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1988             pos = avio_tell(s->pb);
1989             for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1990                 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1991                 avio_read(s->pb, pcr_buf, 12);
1992                 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1993                     /* XXX: not precise enough */
1994                     ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1995                         (i + 1);
1996                     break;
1997                 }
1998             }
1999             avio_seek(s->pb, pos, SEEK_SET);
2000             /* no next PCR found: we use previous increment */
2001             ts->cur_pcr = pcr_h * 300 + pcr_l;
2002         }
2003         pkt->pts = ts->cur_pcr;
2004         pkt->duration = ts->pcr_incr;
2005         ts->cur_pcr += ts->pcr_incr;
2006     }
2007     pkt->stream_index = 0;
2008     return 0;
2009 }
2010
2011 static int mpegts_read_packet(AVFormatContext *s,
2012                               AVPacket *pkt)
2013 {
2014     MpegTSContext *ts = s->priv_data;
2015     int ret, i;
2016
2017     ts->pkt = pkt;
2018     ret = handle_packets(ts, 0);
2019     if (ret < 0) {
2020         /* flush pes data left */
2021         for (i = 0; i < NB_PID_MAX; i++) {
2022             if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2023                 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2024                 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2025                     new_pes_packet(pes, pkt);
2026                     pes->state = MPEGTS_SKIP;
2027                     ret = 0;
2028                     break;
2029                 }
2030             }
2031         }
2032     }
2033
2034     return ret;
2035 }
2036
2037 static int mpegts_read_close(AVFormatContext *s)
2038 {
2039     MpegTSContext *ts = s->priv_data;
2040     int i;
2041
2042     clear_programs(ts);
2043
2044     for(i=0;i<NB_PID_MAX;i++)
2045         if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2046
2047     return 0;
2048 }
2049
2050 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2051                               int64_t *ppos, int64_t pos_limit)
2052 {
2053     MpegTSContext *ts = s->priv_data;
2054     int64_t pos, timestamp;
2055     uint8_t buf[TS_PACKET_SIZE];
2056     int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2057     const int find_next= 1;
2058     pos = ((*ppos  + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2059     if (find_next) {
2060         for(;;) {
2061             avio_seek(s->pb, pos, SEEK_SET);
2062             if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2063                 return AV_NOPTS_VALUE;
2064             if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2065                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2066                 break;
2067             }
2068             pos += ts->raw_packet_size;
2069         }
2070     } else {
2071         for(;;) {
2072             pos -= ts->raw_packet_size;
2073             if (pos < 0)
2074                 return AV_NOPTS_VALUE;
2075             avio_seek(s->pb, pos, SEEK_SET);
2076             if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2077                 return AV_NOPTS_VALUE;
2078             if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2079                 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2080                 break;
2081             }
2082         }
2083     }
2084     *ppos = pos;
2085
2086     return timestamp;
2087 }
2088
2089 #ifdef USE_SYNCPOINT_SEARCH
2090
2091 static int read_seek2(AVFormatContext *s,
2092                       int stream_index,
2093                       int64_t min_ts,
2094                       int64_t target_ts,
2095                       int64_t max_ts,
2096                       int flags)
2097 {
2098     int64_t pos;
2099
2100     int64_t ts_ret, ts_adj;
2101     int stream_index_gen_search;
2102     AVStream *st;
2103     AVParserState *backup;
2104
2105     backup = ff_store_parser_state(s);
2106
2107     // detect direction of seeking for search purposes
2108     flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
2109              AVSEEK_FLAG_BACKWARD : 0;
2110
2111     if (flags & AVSEEK_FLAG_BYTE) {
2112         // use position directly, we will search starting from it
2113         pos = target_ts;
2114     } else {
2115         // search for some position with good timestamp match
2116         if (stream_index < 0) {
2117             stream_index_gen_search = av_find_default_stream_index(s);
2118             if (stream_index_gen_search < 0) {
2119                 ff_restore_parser_state(s, backup);
2120                 return -1;
2121             }
2122
2123             st = s->streams[stream_index_gen_search];
2124             // timestamp for default must be expressed in AV_TIME_BASE units
2125             ts_adj = av_rescale(target_ts,
2126                                 st->time_base.den,
2127                                 AV_TIME_BASE * (int64_t)st->time_base.num);
2128         } else {
2129             ts_adj = target_ts;
2130             stream_index_gen_search = stream_index;
2131         }
2132         pos = ff_gen_search(s, stream_index_gen_search, ts_adj,
2133                             0, INT64_MAX, -1,
2134                             AV_NOPTS_VALUE,
2135                             AV_NOPTS_VALUE,
2136                             flags, &ts_ret, mpegts_get_pcr);
2137         if (pos < 0) {
2138             ff_restore_parser_state(s, backup);
2139             return -1;
2140         }
2141     }
2142
2143     // search for actual matching keyframe/starting position for all streams
2144     if (ff_gen_syncpoint_search(s, stream_index, pos,
2145                                 min_ts, target_ts, max_ts,
2146                                 flags) < 0) {
2147         ff_restore_parser_state(s, backup);
2148         return -1;
2149     }
2150
2151     ff_free_parser_state(s, backup);
2152     return 0;
2153 }
2154
2155 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
2156 {
2157     int ret;
2158     if (flags & AVSEEK_FLAG_BACKWARD) {
2159         flags &= ~AVSEEK_FLAG_BACKWARD;
2160         ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
2161         if (ret < 0)
2162             // for compatibility reasons, seek to the best-fitting timestamp
2163             ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
2164     } else {
2165         ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
2166         if (ret < 0)
2167             // for compatibility reasons, seek to the best-fitting timestamp
2168             ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
2169     }
2170     return ret;
2171 }
2172
2173 #else
2174
2175 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
2176     MpegTSContext *ts = s->priv_data;
2177     uint8_t buf[TS_PACKET_SIZE];
2178     int64_t pos;
2179
2180     if (ff_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
2181         return -1;
2182
2183     pos= avio_tell(s->pb);
2184
2185     for(;;) {
2186         avio_seek(s->pb, pos, SEEK_SET);
2187         if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2188             return -1;
2189 //        pid = AV_RB16(buf + 1) & 0x1fff;
2190         if(buf[1] & 0x40) break;
2191         pos += ts->raw_packet_size;
2192     }
2193     avio_seek(s->pb, pos, SEEK_SET);
2194
2195     return 0;
2196 }
2197
2198 #endif
2199
2200 /**************************************************************/
2201 /* parsing functions - called from other demuxers such as RTP */
2202
2203 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2204 {
2205     MpegTSContext *ts;
2206
2207     ts = av_mallocz(sizeof(MpegTSContext));
2208     if (!ts)
2209         return NULL;
2210     /* no stream case, currently used by RTP */
2211     ts->raw_packet_size = TS_PACKET_SIZE;
2212     ts->stream = s;
2213     ts->auto_guess = 1;
2214     return ts;
2215 }
2216
2217 /* return the consumed length if a packet was output, or -1 if no
2218    packet is output */
2219 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2220                         const uint8_t *buf, int len)
2221 {
2222     int len1;
2223
2224     len1 = len;
2225     ts->pkt = pkt;
2226     ts->stop_parse = 0;
2227     for(;;) {
2228         if (ts->stop_parse>0)
2229             break;
2230         if (len < TS_PACKET_SIZE)
2231             return -1;
2232         if (buf[0] != 0x47) {
2233             buf++;
2234             len--;
2235         } else {
2236             handle_packet(ts, buf);
2237             buf += TS_PACKET_SIZE;
2238             len -= TS_PACKET_SIZE;
2239         }
2240     }
2241     return len1 - len;
2242 }
2243
2244 void ff_mpegts_parse_close(MpegTSContext *ts)
2245 {
2246     int i;
2247
2248     for(i=0;i<NB_PID_MAX;i++)
2249         av_free(ts->pids[i]);
2250     av_free(ts);
2251 }
2252
2253 AVInputFormat ff_mpegts_demuxer = {
2254     .name           = "mpegts",
2255     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
2256     .priv_data_size = sizeof(MpegTSContext),
2257     .read_probe     = mpegts_probe,
2258     .read_header    = mpegts_read_header,
2259     .read_packet    = mpegts_read_packet,
2260     .read_close     = mpegts_read_close,
2261     .read_seek      = read_seek,
2262     .read_timestamp = mpegts_get_pcr,
2263     .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
2264 #ifdef USE_SYNCPOINT_SEARCH
2265     .read_seek2 = read_seek2,
2266 #endif
2267 };
2268
2269 AVInputFormat ff_mpegtsraw_demuxer = {
2270     .name           = "mpegtsraw",
2271     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
2272     .priv_data_size = sizeof(MpegTSContext),
2273     .read_header    = mpegts_read_header,
2274     .read_packet    = mpegts_raw_read_packet,
2275     .read_close     = mpegts_read_close,
2276     .read_seek      = read_seek,
2277     .read_timestamp = mpegts_get_pcr,
2278     .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
2279 #ifdef USE_SYNCPOINT_SEARCH
2280     .read_seek2 = read_seek2,
2281 #endif
2282     .priv_class = &mpegtsraw_class,
2283 };