PeerStreamer

/*

 * MPEG2 transport stream (aka DVB) demuxer

 * Copyright (c) 2002-2003 Fabrice Bellard

 *

 * This file is part of Libav.

 *

 * Libav is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * Libav is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with Libav; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

//#define DEBUG

//#define DEBUG_SEEK

//#define USE_SYNCPOINT_SEARCH

#include "libavutil/crc.h"

#include "libavutil/intreadwrite.h"

#include "libavcodec/bytestream.h"

#include "avformat.h"

#include "mpegts.h"

#include "internal.h"

#include "avio_internal.h"

#include "seek.h"

#include "mpeg.h"

#include "isom.h"

/* maximum size in which we look for synchronisation if

   synchronisation is lost */

#define MAX_RESYNC_SIZE 65536

#define MAX_PES_PAYLOAD 200*1024

enum MpegTSFilterType {

    MPEGTS_PES,

    MPEGTS_SECTION,

};

typedef struct MpegTSFilter MpegTSFilter;

typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);

typedef struct MpegTSPESFilter {

    PESCallback *pes_cb;

    void *opaque;

} MpegTSPESFilter;

typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);

typedef void SetServiceCallback(void *opaque, int ret);

typedef struct MpegTSSectionFilter {

    int section_index;

    int section_h_size;

    uint8_t *section_buf;

    unsigned int check_crc:1;

    unsigned int end_of_section_reached:1;

    SectionCallback *section_cb;

    void *opaque;

} MpegTSSectionFilter;

struct MpegTSFilter {

    int pid;

    int last_cc; /* last cc code (-1 if first packet) */

    enum MpegTSFilterType type;

    union {

        MpegTSPESFilter pes_filter;

        MpegTSSectionFilter section_filter;

    } u;

};

#define MAX_PIDS_PER_PROGRAM 64

struct Program {

    unsigned int id; //program id/service id

    unsigned int nb_pids;

    unsigned int pids[MAX_PIDS_PER_PROGRAM];

};

struct MpegTSContext {

    /* user data */

    AVFormatContext *stream;

    /** raw packet size, including FEC if present            */

    int raw_packet_size;

    int pos47;

    /** if true, all pids are analyzed to find streams       */

    int auto_guess;

    /** compute exact PCR for each transport stream packet   */

    int mpeg2ts_compute_pcr;

    int64_t cur_pcr;    /**< used to estimate the exact PCR  */

    int pcr_incr;       /**< used to estimate the exact PCR  */

    /* data needed to handle file based ts */

    /** stop parsing loop                                    */

    int stop_parse;

    /** packet containing Audio/Video data                   */

    AVPacket *pkt;

    /** to detect seek                                       */

    int64_t last_pos;

    /******************************************/

    /* private mpegts data */

    /* scan context */

    /** structure to keep track of Program->pids mapping     */

    unsigned int nb_prg;

    struct Program *prg;

    /** filters for various streams specified by PMT + for the PAT and PMT */

    MpegTSFilter *pids[NB_PID_MAX];

};

/* TS stream handling */

enum MpegTSState {

    MPEGTS_HEADER = 0,

    MPEGTS_PESHEADER,

    MPEGTS_PESHEADER_FILL,

    MPEGTS_PAYLOAD,

    MPEGTS_SKIP,

};

/* enough for PES header + length */

#define PES_START_SIZE  6

#define PES_HEADER_SIZE 9

#define MAX_PES_HEADER_SIZE (9 + 255)

typedef struct PESContext {

    int pid;

    int pcr_pid; /**< if -1 then all packets containing PCR are considered */

    int stream_type;

    MpegTSContext *ts;

    AVFormatContext *stream;

    AVStream *st;

    AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */

    enum MpegTSState state;

    /* used to get the format */

    int data_index;

    int total_size;

    int pes_header_size;

    int extended_stream_id;

    int64_t pts, dts;

    int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */

    uint8_t header[MAX_PES_HEADER_SIZE];

    uint8_t *buffer;

} PESContext;

extern AVInputFormat ff_mpegts_demuxer;

static void clear_program(MpegTSContext *ts, unsigned int programid)

{

    int i;

    for(i=0; i<ts->nb_prg; i++)

        if(ts->prg[i].id == programid)

            ts->prg[i].nb_pids = 0;

}

static void clear_programs(MpegTSContext *ts)

{

    av_freep(&ts->prg);

    ts->nb_prg=0;

}

static void add_pat_entry(MpegTSContext *ts, unsigned int programid)

{

    struct Program *p;

    void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));

    if(!tmp)

        return;

    ts->prg = tmp;

    p = &ts->prg[ts->nb_prg];

    p->id = programid;

    p->nb_pids = 0;

    ts->nb_prg++;

}

static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)

{

    int i;

    struct Program *p = NULL;

    for(i=0; i<ts->nb_prg; i++) {

        if(ts->prg[i].id == programid) {

            p = &ts->prg[i];

            break;

        }

    }

    if(!p)

        return;

    if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)

        return;

    p->pids[p->nb_pids++] = pid;

}

/**

 * \brief discard_pid() decides if the pid is to be discarded according

 *                      to caller's programs selection

 * \param ts    : - TS context

 * \param pid   : - pid

 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL

 *         0 otherwise

 */

static int discard_pid(MpegTSContext *ts, unsigned int pid)

{

    int i, j, k;

    int used = 0, discarded = 0;

    struct Program *p;

    for(i=0; i<ts->nb_prg; i++) {

        p = &ts->prg[i];

        for(j=0; j<p->nb_pids; j++) {

            if(p->pids[j] != pid)

                continue;

            //is program with id p->id set to be discarded?

            for(k=0; k<ts->stream->nb_programs; k++) {

                if(ts->stream->programs[k]->id == p->id) {

                    if(ts->stream->programs[k]->discard == AVDISCARD_ALL)

                        discarded++;

                    else

                        used++;

                }

            }

        }

    }

    return !used && discarded;

}

/**

 *  Assemble PES packets out of TS packets, and then call the "section_cb"

 *  function when they are complete.

 */

static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,

                               const uint8_t *buf, int buf_size, int is_start)

{

    MpegTSSectionFilter *tss = &tss1->u.section_filter;

    int len;

    if (is_start) {

        memcpy(tss->section_buf, buf, buf_size);

        tss->section_index = buf_size;

        tss->section_h_size = -1;

        tss->end_of_section_reached = 0;

    } else {

        if (tss->end_of_section_reached)

            return;

        len = 4096 - tss->section_index;

        if (buf_size < len)

            len = buf_size;

        memcpy(tss->section_buf + tss->section_index, buf, len);

        tss->section_index += len;

    }

    /* compute section length if possible */

    if (tss->section_h_size == -1 && tss->section_index >= 3) {

        len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;

        if (len > 4096)

            return;

        tss->section_h_size = len;

    }

    if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {

        tss->end_of_section_reached = 1;

        if (!tss->check_crc ||

            av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,

                   tss->section_buf, tss->section_h_size) == 0)

            tss->section_cb(tss1, tss->section_buf, tss->section_h_size);

    }

}

static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,

                                         SectionCallback *section_cb, void *opaque,

                                         int check_crc)

{

    MpegTSFilter *filter;

    MpegTSSectionFilter *sec;

    av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);

    if (pid >= NB_PID_MAX || ts->pids[pid])

        return NULL;

    filter = av_mallocz(sizeof(MpegTSFilter));

    if (!filter)

        return NULL;

    ts->pids[pid] = filter;

    filter->type = MPEGTS_SECTION;

    filter->pid = pid;

    filter->last_cc = -1;

    sec = &filter->u.section_filter;

    sec->section_cb = section_cb;

    sec->opaque = opaque;

    sec->section_buf = av_malloc(MAX_SECTION_SIZE);

    sec->check_crc = check_crc;

    if (!sec->section_buf) {

        av_free(filter);

        return NULL;

    }

    return filter;

}

static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,

                                     PESCallback *pes_cb,

                                     void *opaque)

{

    MpegTSFilter *filter;

    MpegTSPESFilter *pes;

    if (pid >= NB_PID_MAX || ts->pids[pid])

        return NULL;

    filter = av_mallocz(sizeof(MpegTSFilter));

    if (!filter)

        return NULL;

    ts->pids[pid] = filter;

    filter->type = MPEGTS_PES;

    filter->pid = pid;

    filter->last_cc = -1;

    pes = &filter->u.pes_filter;

    pes->pes_cb = pes_cb;

    pes->opaque = opaque;

    return filter;

}

static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)

{

    int pid;

    pid = filter->pid;

    if (filter->type == MPEGTS_SECTION)

        av_freep(&filter->u.section_filter.section_buf);

    else if (filter->type == MPEGTS_PES) {

        PESContext *pes = filter->u.pes_filter.opaque;

        av_freep(&pes->buffer);

        /* referenced private data will be freed later in

         * av_close_input_stream */

        if (!((PESContext *)filter->u.pes_filter.opaque)->st) {

            av_freep(&filter->u.pes_filter.opaque);

        }

    }

    av_free(filter);

    ts->pids[pid] = NULL;

}

static int analyze(const uint8_t *buf, int size, int packet_size, int *index){

    int stat[TS_MAX_PACKET_SIZE];

    int i;

    int x=0;

    int best_score=0;

    memset(stat, 0, packet_size*sizeof(int));

    for(x=i=0; i<size-3; i++){

        if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){

            stat[x]++;

            if(stat[x] > best_score){

                best_score= stat[x];

                if(index) *index= x;

            }

        }

        x++;

        if(x == packet_size) x= 0;

    }

    return best_score;

}

/* autodetect fec presence. Must have at least 1024 bytes  */

static int get_packet_size(const uint8_t *buf, int size)

{

    int score, fec_score, dvhs_score;

    if (size < (TS_FEC_PACKET_SIZE * 5 + 1))

        return -1;

    score    = analyze(buf, size, TS_PACKET_SIZE, NULL);

    dvhs_score    = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);

    fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);

//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);

    if     (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;

    else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;

    else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;

    else                       return -1;

}

typedef struct SectionHeader {

    uint8_t tid;

    uint16_t id;

    uint8_t version;

    uint8_t sec_num;

    uint8_t last_sec_num;

} SectionHeader;

static inline int get8(const uint8_t **pp, const uint8_t *p_end)

{

    const uint8_t *p;

    int c;

    p = *pp;

    if (p >= p_end)

        return -1;

    c = *p++;

    *pp = p;

    return c;

}

static inline int get16(const uint8_t **pp, const uint8_t *p_end)

{

    const uint8_t *p;

    int c;

    p = *pp;

    if ((p + 1) >= p_end)

        return -1;

    c = AV_RB16(p);

    p += 2;

    *pp = p;

    return c;

}

/* read and allocate a DVB string preceeded by its length */

static char *getstr8(const uint8_t **pp, const uint8_t *p_end)

{

    int len;

    const uint8_t *p;

    char *str;

    p = *pp;

    len = get8(&p, p_end);

    if (len < 0)

        return NULL;

    if ((p + len) > p_end)

        return NULL;

    str = av_malloc(len + 1);

    if (!str)

        return NULL;

    memcpy(str, p, len);

    str[len] = '\0';

    p += len;

    *pp = p;

    return str;

}

static int parse_section_header(SectionHeader *h,

                                const uint8_t **pp, const uint8_t *p_end)

{

    int val;

    val = get8(pp, p_end);

    if (val < 0)

        return -1;

    h->tid = val;

    *pp += 2;

    val = get16(pp, p_end);

    if (val < 0)

        return -1;

    h->id = val;

    val = get8(pp, p_end);

    if (val < 0)

        return -1;

    h->version = (val >> 1) & 0x1f;

    val = get8(pp, p_end);

    if (val < 0)

        return -1;

    h->sec_num = val;

    val = get8(pp, p_end);

    if (val < 0)

        return -1;

    h->last_sec_num = val;

    return 0;

}

typedef struct {

    uint32_t stream_type;

    enum AVMediaType codec_type;

    enum CodecID codec_id;

} StreamType;

static const StreamType ISO_types[] = {

    { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },

    { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },

    { 0x03, AVMEDIA_TYPE_AUDIO,        CODEC_ID_MP3 },

    { 0x04, AVMEDIA_TYPE_AUDIO,        CODEC_ID_MP3 },

    { 0x0f, AVMEDIA_TYPE_AUDIO,        CODEC_ID_AAC },

    { 0x10, AVMEDIA_TYPE_VIDEO,      CODEC_ID_MPEG4 },

    { 0x11, AVMEDIA_TYPE_AUDIO,   CODEC_ID_AAC_LATM }, /* LATM syntax */

    { 0x1b, AVMEDIA_TYPE_VIDEO,       CODEC_ID_H264 },

    { 0xd1, AVMEDIA_TYPE_VIDEO,      CODEC_ID_DIRAC },

    { 0xea, AVMEDIA_TYPE_VIDEO,        CODEC_ID_VC1 },

    { 0 },

};

static const StreamType HDMV_types[] = {

    { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },

    { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },

    { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },

    { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },

    { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },

    { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },

    { 0 },

};

/* ATSC ? */

static const StreamType MISC_types[] = {

    { 0x81, AVMEDIA_TYPE_AUDIO,   CODEC_ID_AC3 },

    { 0x8a, AVMEDIA_TYPE_AUDIO,   CODEC_ID_DTS },

    { 0 },

};

static const StreamType REGD_types[] = {

    { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },

    { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO,   CODEC_ID_AC3 },

    { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },

    { 0 },

};

/* descriptor present */

static const StreamType DESC_types[] = {

    { 0x6a, AVMEDIA_TYPE_AUDIO,             CODEC_ID_AC3 }, /* AC-3 descriptor */

    { 0x7a, AVMEDIA_TYPE_AUDIO,            CODEC_ID_EAC3 }, /* E-AC-3 descriptor */

    { 0x7b, AVMEDIA_TYPE_AUDIO,             CODEC_ID_DTS },

    { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },

    { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */

    { 0 },

};

static void mpegts_find_stream_type(AVStream *st,

                                    uint32_t stream_type, const StreamType *types)

{

    for (; types->stream_type; types++) {

        if (stream_type == types->stream_type) {

            st->codec->codec_type = types->codec_type;

            st->codec->codec_id   = types->codec_id;

            return;

        }

    }

}

static int mpegts_set_stream_info(AVStream *st, PESContext *pes,

                                  uint32_t stream_type, uint32_t prog_reg_desc)

{

    av_set_pts_info(st, 33, 1, 90000);

    st->priv_data = pes;

    st->codec->codec_type = AVMEDIA_TYPE_DATA;

    st->codec->codec_id   = CODEC_ID_NONE;

    st->need_parsing = AVSTREAM_PARSE_FULL;

    pes->st = st;

    pes->stream_type = stream_type;

    av_log(pes->stream, AV_LOG_DEBUG,

           "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",

           st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);

    st->codec->codec_tag = pes->stream_type;

    mpegts_find_stream_type(st, pes->stream_type, ISO_types);

    if (prog_reg_desc == AV_RL32("HDMV") &&

        st->codec->codec_id == CODEC_ID_NONE) {

        mpegts_find_stream_type(st, pes->stream_type, HDMV_types);

        if (pes->stream_type == 0x83) {

            // HDMV TrueHD streams also contain an AC3 coded version of the

            // audio track - add a second stream for this

            AVStream *sub_st;

            // priv_data cannot be shared between streams

            PESContext *sub_pes = av_malloc(sizeof(*sub_pes));

            if (!sub_pes)

                return AVERROR(ENOMEM);

            memcpy(sub_pes, pes, sizeof(*sub_pes));

            sub_st = av_new_stream(pes->stream, pes->pid);

            if (!sub_st) {

                av_free(sub_pes);

                return AVERROR(ENOMEM);

            }

            av_set_pts_info(sub_st, 33, 1, 90000);

            sub_st->priv_data = sub_pes;

            sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

            sub_st->codec->codec_id   = CODEC_ID_AC3;

            sub_st->need_parsing = AVSTREAM_PARSE_FULL;

            sub_pes->sub_st = pes->sub_st = sub_st;

        }

    }

    if (st->codec->codec_id == CODEC_ID_NONE)

        mpegts_find_stream_type(st, pes->stream_type, MISC_types);

    return 0;

}

static void new_pes_packet(PESContext *pes, AVPacket *pkt)

{

    av_init_packet(pkt);

    pkt->destruct = av_destruct_packet;

    pkt->data = pes->buffer;

    pkt->size = pes->data_index;

    memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

    // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID

    if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)

        pkt->stream_index = pes->sub_st->index;

    else

        pkt->stream_index = pes->st->index;

    pkt->pts = pes->pts;

    pkt->dts = pes->dts;

    /* store position of first TS packet of this PES packet */

    pkt->pos = pes->ts_packet_pos;

    /* reset pts values */

    pes->pts = AV_NOPTS_VALUE;

    pes->dts = AV_NOPTS_VALUE;

    pes->buffer = NULL;

    pes->data_index = 0;

}

/* return non zero if a packet could be constructed */

static int mpegts_push_data(MpegTSFilter *filter,

                            const uint8_t *buf, int buf_size, int is_start,

                            int64_t pos)

{

    PESContext *pes = filter->u.pes_filter.opaque;

    MpegTSContext *ts = pes->ts;

    const uint8_t *p;

    int len, code;

    if(!ts->pkt)

        return 0;

    if (is_start) {

        if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {

            new_pes_packet(pes, ts->pkt);

            ts->stop_parse = 1;

        }

        pes->state = MPEGTS_HEADER;

        pes->data_index = 0;

        pes->ts_packet_pos = pos;

    }

    p = buf;

    while (buf_size > 0) {

        switch(pes->state) {

        case MPEGTS_HEADER:

            len = PES_START_SIZE - pes->data_index;

            if (len > buf_size)

                len = buf_size;

            memcpy(pes->header + pes->data_index, p, len);

            pes->data_index += len;

            p += len;

            buf_size -= len;

            if (pes->data_index == PES_START_SIZE) {

                /* we got all the PES or section header. We can now

                   decide */

                if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&

                    pes->header[2] == 0x01) {

                    /* it must be an mpeg2 PES stream */

                    code = pes->header[3] | 0x100;

                    av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);

                    if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||

                        code == 0x1be) /* padding_stream */

                        goto skip;

                    /* stream not present in PMT */

                    if (!pes->st) {

                        pes->st = av_new_stream(ts->stream, pes->pid);

                        if (!pes->st)

                            return AVERROR(ENOMEM);

                        mpegts_set_stream_info(pes->st, pes, 0, 0);

                    }

                    pes->total_size = AV_RB16(pes->header + 4);

                    /* NOTE: a zero total size means the PES size is

                       unbounded */

                    if (!pes->total_size)

                        pes->total_size = MAX_PES_PAYLOAD;

                    /* allocate pes buffer */

                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);

                    if (!pes->buffer)

                        return AVERROR(ENOMEM);

                    if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */

                        code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */

                        code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */

                        code != 0x1f8) {                  /* ITU-T Rec. H.222.1 type E stream */

                        pes->state = MPEGTS_PESHEADER;

                        if (pes->st->codec->codec_id == CODEC_ID_NONE) {

                            av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",

                                    pes->pid, pes->stream_type);

                            pes->st->codec->codec_id = CODEC_ID_PROBE;

                        }

                    } else {

                        pes->state = MPEGTS_PAYLOAD;

                        pes->data_index = 0;

                    }

                } else {

                    /* otherwise, it should be a table */

                    /* skip packet */

                skip:

                    pes->state = MPEGTS_SKIP;

                    continue;

                }

            }

            break;

            /**********************************************/

            /* PES packing parsing */

        case MPEGTS_PESHEADER:

            len = PES_HEADER_SIZE - pes->data_index;

            if (len < 0)

                return -1;

            if (len > buf_size)

                len = buf_size;

            memcpy(pes->header + pes->data_index, p, len);

            pes->data_index += len;

            p += len;

            buf_size -= len;

            if (pes->data_index == PES_HEADER_SIZE) {

                pes->pes_header_size = pes->header[8] + 9;

                pes->state = MPEGTS_PESHEADER_FILL;

            }

            break;

        case MPEGTS_PESHEADER_FILL:

            len = pes->pes_header_size - pes->data_index;

            if (len < 0)

                return -1;

            if (len > buf_size)

                len = buf_size;

            memcpy(pes->header + pes->data_index, p, len);

            pes->data_index += len;

            p += len;

            buf_size -= len;

            if (pes->data_index == pes->pes_header_size) {

                const uint8_t *r;

                unsigned int flags, pes_ext, skip;

                flags = pes->header[7];

                r = pes->header + 9;

                pes->pts = AV_NOPTS_VALUE;

                pes->dts = AV_NOPTS_VALUE;

                if ((flags & 0xc0) == 0x80) {

                    pes->dts = pes->pts = ff_parse_pes_pts(r);

                    r += 5;

                } else if ((flags & 0xc0) == 0xc0) {

                    pes->pts = ff_parse_pes_pts(r);

                    r += 5;

                    pes->dts = ff_parse_pes_pts(r);

                    r += 5;

                }

                pes->extended_stream_id = -1;

                if (flags & 0x01) { /* PES extension */

                    pes_ext = *r++;

                    /* Skip PES private data, program packet sequence counter and P-STD buffer */

                    skip = (pes_ext >> 4) & 0xb;

                    skip += skip & 0x9;

                    r += skip;

                    if ((pes_ext & 0x41) == 0x01 &&

                        (r + 2) <= (pes->header + pes->pes_header_size)) {

                        /* PES extension 2 */

                        if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)

                            pes->extended_stream_id = r[1];

                    }

                }

                /* we got the full header. We parse it and get the payload */

                pes->state = MPEGTS_PAYLOAD;

                pes->data_index = 0;

            }

            break;

        case MPEGTS_PAYLOAD:

            if (buf_size > 0 && pes->buffer) {

                if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {

                    new_pes_packet(pes, ts->pkt);

                    pes->total_size = MAX_PES_PAYLOAD;

                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);

                    if (!pes->buffer)

                        return AVERROR(ENOMEM);

                    ts->stop_parse = 1;

                } else if (pes->data_index == 0 && buf_size > pes->total_size) {

                    // pes packet size is < ts size packet and pes data is padded with 0xff

                    // not sure if this is legal in ts but see issue #2392

                    buf_size = pes->total_size;

                }

                memcpy(pes->buffer+pes->data_index, p, buf_size);

                pes->data_index += buf_size;

            }

            buf_size = 0;

            /* emit complete packets with known packet size

             * decreases demuxer delay for infrequent packets like subtitles from

             * a couple of seconds to milliseconds for properly muxed files.

             * total_size is the number of bytes following pes_packet_length

             * in the pes header, i.e. not counting the first 6 bytes */

            if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&

                pes->pes_header_size + pes->data_index == pes->total_size + 6) {

                ts->stop_parse = 1;

                new_pes_packet(pes, ts->pkt);

            }

            break;

        case MPEGTS_SKIP:

            buf_size = 0;

            break;

        }

    }

    return 0;

}

static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)

{

    MpegTSFilter *tss;

    PESContext *pes;

    /* if no pid found, then add a pid context */

    pes = av_mallocz(sizeof(PESContext));

    if (!pes)

        return 0;

    pes->ts = ts;

    pes->stream = ts->stream;

    pes->pid = pid;

    pes->pcr_pid = pcr_pid;

    pes->state = MPEGTS_SKIP;

    pes->pts = AV_NOPTS_VALUE;

    pes->dts = AV_NOPTS_VALUE;

    tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);

    if (!tss) {

        av_free(pes);

        return 0;

    }

    return pes;

}

static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,

                         int *es_id, uint8_t **dec_config_descr,

                         int *dec_config_descr_size)

{

    AVIOContext pb;

    int tag;

    unsigned len;

    ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL);

    len = ff_mp4_read_descr(s, &pb, &tag);

    if (tag == MP4IODescrTag) {

        avio_rb16(&pb); // ID

        avio_r8(&pb);

        avio_r8(&pb);

        avio_r8(&pb);

        avio_r8(&pb);

        avio_r8(&pb);

        len = ff_mp4_read_descr(s, &pb, &tag);

        if (tag == MP4ESDescrTag) {

            *es_id = avio_rb16(&pb); /* ES_ID */

            av_dlog(s, "ES_ID %#x\n", *es_id);

            avio_r8(&pb); /* priority */

            len = ff_mp4_read_descr(s, &pb, &tag);

            if (tag == MP4DecConfigDescrTag) {

                *dec_config_descr = av_malloc(len);

                if (!*dec_config_descr)

                    return AVERROR(ENOMEM);

                *dec_config_descr_size = len;

                avio_read(&pb, *dec_config_descr, len);

            }

        }

    }

    return 0;

}

int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,

                              const uint8_t **pp, const uint8_t *desc_list_end,

                              int mp4_dec_config_descr_len, int mp4_es_id, int pid,

                              uint8_t *mp4_dec_config_descr)

{

    const uint8_t *desc_end;

    int desc_len, desc_tag;

    char language[252];

    int i;

    desc_tag = get8(pp, desc_list_end);

    if (desc_tag < 0)

        return -1;

    desc_len = get8(pp, desc_list_end);

    if (desc_len < 0)

        return -1;

    desc_end = *pp + desc_len;

    if (desc_end > desc_list_end)

        return -1;

    av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);

    if (st->codec->codec_id == CODEC_ID_NONE &&

        stream_type == STREAM_TYPE_PRIVATE_DATA)

        mpegts_find_stream_type(st, desc_tag, DESC_types);

    switch(desc_tag) {

    case 0x1F: /* FMC descriptor */

        get16(pp, desc_end);

        if (st->codec->codec_id == CODEC_ID_AAC_LATM &&

            mp4_dec_config_descr_len && mp4_es_id == pid) {

            AVIOContext pb;

            ffio_init_context(&pb, mp4_dec_config_descr,

                          mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);

            ff_mp4_read_dec_config_descr(fc, st, &pb);

            if (st->codec->codec_id == CODEC_ID_AAC &&

                st->codec->extradata_size > 0)

                st->need_parsing = 0;

        }

        break;

    case 0x56: /* DVB teletext descriptor */

        language[0] = get8(pp, desc_end);

        language[1] = get8(pp, desc_end);

        language[2] = get8(pp, desc_end);

        language[3] = 0;

        av_metadata_set2(&st->metadata, "language", language, 0);

        break;

    case 0x59: /* subtitling descriptor */

        language[0] = get8(pp, desc_end);

        language[1] = get8(pp, desc_end);

        language[2] = get8(pp, desc_end);

        language[3] = 0;

        /* hearing impaired subtitles detection */

        switch(get8(pp, desc_end)) {

        case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */

        case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */

        case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */

        case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */

        case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */

        case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */

            st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;

            break;

        }

        if (st->codec->extradata) {

            if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))

                av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");

        } else {

            st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);

            if (st->codec->extradata) {

                st->codec->extradata_size = 4;

                memcpy(st->codec->extradata, *pp, 4);

            }

        }

        *pp += 4;

        av_metadata_set2(&st->metadata, "language", language, 0);

        break;

    case 0x0a: /* ISO 639 language descriptor */

        for (i = 0; i + 4 <= desc_len; i += 4) {

            language[i + 0] = get8(pp, desc_end);

            language[i + 1] = get8(pp, desc_end);

            language[i + 2] = get8(pp, desc_end);

            language[i + 3] = ',';

        switch (get8(pp, desc_end)) {

            case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;

            case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;

            case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;

        }

        }

        if (i) {

            language[i - 1] = 0;

            av_metadata_set2(&st->metadata, "language", language, 0);

        }

        break;

    case 0x05: /* registration descriptor */

        st->codec->codec_tag = bytestream_get_le32(pp);

        av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);

        if (st->codec->codec_id == CODEC_ID_NONE &&

            stream_type == STREAM_TYPE_PRIVATE_DATA)

            mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);

        break;

    default:

        break;

    }

    *pp = desc_end;

    return 0;

}

static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)

{

    MpegTSContext *ts = filter->u.section_filter.opaque;

    SectionHeader h1, *h = &h1;

    PESContext *pes;

    AVStream *st;

    const uint8_t *p, *p_end, *desc_list_end;

    int program_info_length, pcr_pid, pid, stream_type;

    int desc_list_len;

    uint32_t prog_reg_desc = 0; /* registration descriptor */

    uint8_t *mp4_dec_config_descr = NULL;

    int mp4_dec_config_descr_len = 0;

    int mp4_es_id = 0;

#ifdef DEBUG

    av_dlog(ts->stream, "PMT: len %i\n", section_len);

    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);

#endif

    p_end = section + section_len - 4;

    p = section;

    if (parse_section_header(h, &p, p_end) < 0)

        return;

    av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",

           h->id, h->sec_num, h->last_sec_num);

    if (h->tid != PMT_TID)

        return;

    clear_program(ts, h->id);

    pcr_pid = get16(&p, p_end) & 0x1fff;

    if (pcr_pid < 0)

        return;

    add_pid_to_pmt(ts, h->id, pcr_pid);

    av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);

    program_info_length = get16(&p, p_end) & 0xfff;

    if (program_info_length < 0)

        return;

    while(program_info_length >= 2) {

        uint8_t tag, len;

        tag = get8(&p, p_end);

        len = get8(&p, p_end);

        av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);

        if(len > program_info_length - 2)

            //something else is broken, exit the program_descriptors_loop

            break;

        program_info_length -= len + 2;

        if (tag == 0x1d) { // IOD descriptor

            get8(&p, p_end); // scope

            get8(&p, p_end); // label

            len -= 2;

            mp4_read_iods(ts->stream, p, len, &mp4_es_id,

                          &mp4_dec_config_descr, &mp4_dec_config_descr_len);

        } else if (tag == 0x05 && len >= 4) { // registration descriptor

            prog_reg_desc = bytestream_get_le32(&p);

            len -= 4;

        }

        p += len;

    }

    p += program_info_length;

    if (p >= p_end)

        goto out;

    // stop parsing after pmt, we found header

    if (!ts->stream->nb_streams)

        ts->stop_parse = 1;

    for(;;) {

        st = 0;

        stream_type = get8(&p, p_end);

        if (stream_type < 0)

            break;

        pid = get16(&p, p_end) & 0x1fff;

        if (pid < 0)

            break;

        /* now create ffmpeg stream */

        if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {

            pes = ts->pids[pid]->u.pes_filter.opaque;

            if (!pes->st)

                pes->st = av_new_stream(pes->stream, pes->pid);

            st = pes->st;

        } else {

            if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably

            pes = add_pes_stream(ts, pid, pcr_pid);

            if (pes)

                st = av_new_stream(pes->stream, pes->pid);

        }

        if (!st)

            goto out;

        if (!pes->stream_type)

            mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);

        add_pid_to_pmt(ts, h->id, pid);

        ff_program_add_stream_index(ts->stream, h->id, st->index);

        desc_list_len = get16(&p, p_end) & 0xfff;

        if (desc_list_len < 0)

            break;

        desc_list_end = p + desc_list_len;

        if (desc_list_end > p_end)

            break;

        for(;;) {

            if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,

                mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0)

                break;

            if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {

                ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);

                pes->sub_st->codec->codec_tag = st->codec->codec_tag;

            }

        }

        p = desc_list_end;

    }

 out:

    av_free(mp4_dec_config_descr);

}

static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)

{

    MpegTSContext *ts = filter->u.section_filter.opaque;

    SectionHeader h1, *h = &h1;

    const uint8_t *p, *p_end;

    int sid, pmt_pid;

#ifdef DEBUG

    av_dlog(ts->stream, "PAT:\n");

    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);

#endif

    p_end = section + section_len - 4;

    p = section;

    if (parse_section_header(h, &p, p_end) < 0)

        return;

    if (h->tid != PAT_TID)

        return;

    clear_programs(ts);

    for(;;) {

        sid = get16(&p, p_end);

        if (sid < 0)

            break;

        pmt_pid = get16(&p, p_end) & 0x1fff;

        if (pmt_pid < 0)

            break;

        av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);

        if (sid == 0x0000) {

            /* NIT info */

        } else {

            av_new_program(ts->stream, sid);

            if (ts->pids[pmt_pid])

                mpegts_close_filter(ts, ts->pids[pmt_pid]);

            mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);

            add_pat_entry(ts, sid);

            add_pid_to_pmt(ts, sid, 0); //add pat pid to program

            add_pid_to_pmt(ts, sid, pmt_pid);

        }

    }

}

static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)

{

    MpegTSContext *ts = filter->u.section_filter.opaque;

    SectionHeader h1, *h = &h1;

    const uint8_t *p, *p_end, *desc_list_end, *desc_end;

    int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;

    char *name, *provider_name;

#ifdef DEBUG

    av_dlog(ts->stream, "SDT:\n");

    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);

#endif

    p_end = section + section_len - 4;

    p = section;

    if (parse_section_header(h, &p, p_end) < 0)

        return;

    if (h->tid != SDT_TID)

        return;

    onid = get16(&p, p_end);

    if (onid < 0)

        return;

    val = get8(&p, p_end);

    if (val < 0)

        return;

    for(;;) {

        sid = get16(&p, p_end);

        if (sid < 0)

            break;

        val = get8(&p, p_end);

        if (val < 0)

            break;

        desc_list_len = get16(&p, p_end) & 0xfff;

        if (desc_list_len < 0)

            break;

        desc_list_end = p + desc_list_len;

        if (desc_list_end > p_end)

            break;

        for(;;) {

            desc_tag = get8(&p, desc_list_end);

            if (desc_tag < 0)

                break;

            desc_len = get8(&p, desc_list_end);

            desc_end = p + desc_len;

            if (desc_end > desc_list_end)

                break;

            av_dlog(ts->stream, "tag: 0x%02x len=%d\n",

                   desc_tag, desc_len);

            switch(desc_tag) {

            case 0x48:

                service_type = get8(&p, p_end);

                if (service_type < 0)

                    break;

                provider_name = getstr8(&p, p_end);

                if (!provider_name)

                    break;

                name = getstr8(&p, p_end);

                if (name) {

                    AVProgram *program = av_new_program(ts->stream, sid);

                    if(program) {

                        av_metadata_set2(&program->metadata, "service_name", name, 0);

                        av_metadata_set2(&program->metadata, "service_provider", provider_name, 0);

                    }

                }

                av_free(name);

                av_free(provider_name);

                break;

            default:

                break;

            }

            p = desc_end;

        }

        p = desc_list_end;

    }

}

/* handle one TS packet */

static int handle_packet(MpegTSContext *ts, const uint8_t *packet)

{

    AVFormatContext *s = ts->stream;

    MpegTSFilter *tss;

    int len, pid, cc, cc_ok, afc, is_start;

    const uint8_t *p, *p_end;

    int64_t pos;

    pid = AV_RB16(packet + 1) & 0x1fff;

    if(pid && discard_pid(ts, pid))

        return 0;

    is_start = packet[1] & 0x40;

    tss = ts->pids[pid];

    if (ts->auto_guess && tss == NULL && is_start) {

        add_pes_stream(ts, pid, -1);

        tss = ts->pids[pid];

    }

    if (!tss)

        return 0;

    /* continuity check (currently not used) */

    cc = (packet[3] & 0xf);

    cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));

    tss->last_cc = cc;

    /* skip adaptation field */

    afc = (packet[3] >> 4) & 3;

    p = packet + 4;

    if (afc == 0) /* reserved value */

        return 0;

    if (afc == 2) /* adaptation field only */

        return 0;

    if (afc == 3) {

        /* skip adapation field */

        p += p[0] + 1;

    }

    /* if past the end of packet, ignore */

    p_end = packet + TS_PACKET_SIZE;

    if (p >= p_end)

        return 0;

    pos = avio_tell(ts->stream->pb);

    ts->pos47= pos % ts->raw_packet_size;

    if (tss->type == MPEGTS_SECTION) {

        if (is_start) {

            /* pointer field present */

            len = *p++;

            if (p + len > p_end)

                return 0;

            if (len && cc_ok) {

                /* write remaining section bytes */

                write_section_data(s, tss,

                                   p, len, 0);

                /* check whether filter has been closed */

                if (!ts->pids[pid])

                    return 0;

            }

            p += len;

            if (p < p_end) {

                write_section_data(s, tss,

                                   p, p_end - p, 1);

            }

        } else {

            if (cc_ok) {

                write_section_data(s, tss,

                                   p, p_end - p, 0);

            }

        }

    } else {

        int ret;

        // Note: The position here points actually behind the current packet.

        if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,

                                            pos - ts->raw_packet_size)) < 0)

            return ret;

    }

    return 0;

}

/* XXX: try to find a better synchro over several packets (use

   get_packet_size() ?) */

static int mpegts_resync(AVFormatContext *s)

{

    AVIOContext *pb = s->pb;

    int c, i;

    for(i = 0;i < MAX_RESYNC_SIZE; i++) {

        c = avio_r8(pb);

        if (pb->eof_reached)

            return -1;

        if (c == 0x47) {

            avio_seek(pb, -1, SEEK_CUR);

            return 0;

        }

    }

    av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");

    /* no sync found */

    return -1;

}

/* return -1 if error or EOF. Return 0 if OK. */

static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)

{

    AVIOContext *pb = s->pb;