mpegts.c 45.1 KB
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/*
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 * MPEG2 transport stream (aka DVB) demuxer
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 * Copyright (c) 2002-2003 Fabrice Bellard
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 *
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 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/crc.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "mpegts.h"
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#include "internal.h"
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//#define DEBUG_SI
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//#define DEBUG_SEEK
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/* 1.0 second at 24Mbit/s */
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#define MAX_SCAN_PACKETS 32000

/* maximum size in which we look for synchronisation if
   synchronisation is lost */
#define MAX_RESYNC_SIZE 4096
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#define REGISTRATION_DESCRIPTOR 5
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typedef struct PESContext PESContext;

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static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
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static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
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enum MpegTSFilterType {
    MPEGTS_PES,
    MPEGTS_SECTION,
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};

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typedef struct MpegTSFilter MpegTSFilter;

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typedef void PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
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typedef struct MpegTSPESFilter {
    PESCallback *pes_cb;
    void *opaque;
} MpegTSPESFilter;

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

typedef struct MpegTSSectionFilter {
    int section_index;
    int section_h_size;
    uint8_t *section_buf;
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    unsigned int check_crc:1;
    unsigned int end_of_section_reached:1;
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    SectionCallback *section_cb;
    void *opaque;
} MpegTSSectionFilter;

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struct MpegTSFilter {
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    int pid;
    int last_cc; /* last cc code (-1 if first packet) */
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    enum MpegTSFilterType type;
    union {
        MpegTSPESFilter pes_filter;
        MpegTSSectionFilter section_filter;
    } u;
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};
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#define MAX_PIDS_PER_PROGRAM 64
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struct Program {
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    unsigned int id; //program id/service id
    unsigned int nb_pids;
    unsigned int pids[MAX_PIDS_PER_PROGRAM];
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};
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struct MpegTSContext {
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    /* user data */
    AVFormatContext *stream;
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    /** raw packet size, including FEC if present            */
    int raw_packet_size;
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    int pos47;

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    /** if true, all pids are analyzed to find streams       */
    int auto_guess;
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    /** compute exact PCR for each transport stream packet   */
    int mpeg2ts_compute_pcr;
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    int64_t cur_pcr;    /**< used to estimate the exact PCR  */
    int pcr_incr;       /**< used to estimate the exact PCR  */
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    /* data needed to handle file based ts */
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    /** stop parsing loop                                    */
    int stop_parse;
    /** packet containing Audio/Video data                   */
    AVPacket *pkt;
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    /******************************************/
    /* private mpegts data */
    /* scan context */
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    /** structure to keep track of Program->pids mapping     */
    unsigned int nb_prg;
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    struct Program *prg;
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    /** filters for various streams specified by PMT + for the PAT and PMT */
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    MpegTSFilter *pids[NB_PID_MAX];
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};
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/* TS stream handling */

enum MpegTSState {
    MPEGTS_HEADER = 0,
    MPEGTS_PESHEADER_FILL,
    MPEGTS_PAYLOAD,
    MPEGTS_SKIP,
};

/* enough for PES header + length */
#define PES_START_SIZE 9
#define MAX_PES_HEADER_SIZE (9 + 255)

struct PESContext {
    int pid;
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    int pcr_pid; /**< if -1 then all packets containing PCR are considered */
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    int stream_type;
    MpegTSContext *ts;
    AVFormatContext *stream;
    AVStream *st;
    enum MpegTSState state;
    /* used to get the format */
    int data_index;
    int total_size;
    int pes_header_size;
    int64_t pts, dts;
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    int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
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    uint8_t header[MAX_PES_HEADER_SIZE];
};

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extern AVInputFormat mpegts_demuxer;

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

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    return !used && discarded;
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}

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/**
 *  Assembles PES packets out of TS packets, and then calls the "section_cb"
 *  function when they are complete.
 */
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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;
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    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) {
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        len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
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        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;
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        if (!tss->check_crc ||
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            av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
                   tss->section_buf, tss->section_h_size) == 0)
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            tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
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    }
}

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static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
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                                         SectionCallback *section_cb, void *opaque,
                                         int check_crc)

{
    MpegTSFilter *filter;
    MpegTSSectionFilter *sec;
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#ifdef DEBUG_SI
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    av_log(ts->stream, AV_LOG_DEBUG, "Filter: pid=0x%x\n", pid);
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#endif
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    if (pid >= NB_PID_MAX || ts->pids[pid])
        return NULL;
    filter = av_mallocz(sizeof(MpegTSFilter));
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    if (!filter)
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        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;
}

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static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
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                                     PESCallback *pes_cb,
                                     void *opaque)
{
    MpegTSFilter *filter;
    MpegTSPESFilter *pes;

    if (pid >= NB_PID_MAX || ts->pids[pid])
        return NULL;
    filter = av_mallocz(sizeof(MpegTSFilter));
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    if (!filter)
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        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;
}

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static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
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{
    int pid;

    pid = filter->pid;
    if (filter->type == MPEGTS_SECTION)
        av_freep(&filter->u.section_filter.section_buf);
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    else if (filter->type == MPEGTS_PES) {
        /* 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);
        }
    }
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    av_free(filter);
    ts->pids[pid] = NULL;
}

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static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
    int stat[packet_size];
    int i;
    int x=0;
    int best_score=0;

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

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    for(x=i=0; i<size-3; i++){
        if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
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            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;
}

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/* autodetect fec presence. Must have at least 1024 bytes  */
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static int get_packet_size(const uint8_t *buf, int size)
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{
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    int score, fec_score, dvhs_score;
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    if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
        return -1;
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    score    = analyze(buf, size, TS_PACKET_SIZE, NULL);
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    dvhs_score    = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
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    fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
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//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
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    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;
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    else                       return -1;
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}

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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)
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{
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    const uint8_t *p;
    int c;

    p = *pp;
    if (p >= p_end)
        return -1;
    c = *p++;
    *pp = p;
    return c;
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}

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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;
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    c = AV_RB16(p);
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    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)
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{
    int len;
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    const uint8_t *p;
    char *str;
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    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;
}

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static int parse_section_header(SectionHeader *h,
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                                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;
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    return 0;
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}


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static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
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{
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    MpegTSContext *ts = filter->u.section_filter.opaque;
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    SectionHeader h1, *h = &h1;
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    PESContext *pes;
    AVStream *st;
    const uint8_t *p, *p_end, *desc_list_end, *desc_end;
    int program_info_length, pcr_pid, pid, stream_type;
    int desc_list_len, desc_len, desc_tag;
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    int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
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    char language[4] = {0}; /* initialize to kill warnings */
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    int has_hdmv_descr = 0;
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    int has_dirac_descr = 0;
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#ifdef DEBUG_SI
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    av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
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    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
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#endif
    p_end = section + section_len - 4;
    p = section;
    if (parse_section_header(h, &p, p_end) < 0)
        return;
#ifdef DEBUG_SI
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    av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",
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           h->id, h->sec_num, h->last_sec_num);
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#endif
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    if (h->tid != PMT_TID)
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        return;

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    clear_program(ts, h->id);
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    pcr_pid = get16(&p, p_end) & 0x1fff;
    if (pcr_pid < 0)
        return;
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    add_pid_to_pmt(ts, h->id, pcr_pid);
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#ifdef DEBUG_SI
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    av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);
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#endif
    program_info_length = get16(&p, p_end) & 0xfff;
    if (program_info_length < 0)
        return;
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    while(program_info_length >= 2) {
        uint8_t tag, len;
        tag = get8(&p, p_end);
        len = get8(&p, p_end);
        if(len > program_info_length - 2)
            //something else is broken, exit the program_descriptors_loop
            break;
        program_info_length -= len + 2;
        if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
            uint8_t bytes[4];
            bytes[0] = get8(&p, p_end);
            bytes[1] = get8(&p, p_end);
            bytes[2] = get8(&p, p_end);
            bytes[3] = get8(&p, p_end);
            len -= 4;
            if(bytes[0] == 'H' && bytes[1] == 'D' &&
               bytes[2] == 'M' && bytes[3] == 'V')
                has_hdmv_descr = 1;
        }
        p += len;
    }
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    p += program_info_length;
    if (p >= p_end)
        return;
    for(;;) {
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        language[0] = 0;
        st = 0;
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        stream_type = get8(&p, p_end);
        if (stream_type < 0)
            break;
        pid = get16(&p, p_end) & 0x1fff;
        if (pid < 0)
            break;
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        desc_list_len = get16(&p, p_end) & 0xfff;
        if (desc_list_len < 0)
            break;
        desc_list_end = p + desc_list_len;
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        if (desc_list_end > p_end)
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            break;
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        for(;;) {
            desc_tag = get8(&p, desc_list_end);
            if (desc_tag < 0)
                break;
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            if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
                if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
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                    /*assume DVB AC-3 Audio*/
                    stream_type = STREAM_TYPE_AUDIO_AC3;
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                } else if(desc_tag == 0x7B) {
                    /* DVB DTS audio */
                    stream_type = STREAM_TYPE_AUDIO_DTS;
                }
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            }
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            desc_len = get8(&p, desc_list_end);
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            if (desc_len < 0)
                break;
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            desc_end = p + desc_len;
            if (desc_end > desc_list_end)
                break;
#ifdef DEBUG_SI
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            av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
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                   desc_tag, desc_len);
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#endif
            switch(desc_tag) {
            case DVB_SUBT_DESCID:
                if (stream_type == STREAM_TYPE_PRIVATE_DATA)
                    stream_type = STREAM_TYPE_SUBTITLE_DVB;

                language[0] = get8(&p, desc_end);
                language[1] = get8(&p, desc_end);
                language[2] = get8(&p, desc_end);
                language[3] = 0;
                get8(&p, desc_end);
                comp_page = get16(&p, desc_end);
                anc_page = get16(&p, desc_end);

                break;
            case 0x0a: /* ISO 639 language descriptor */
                language[0] = get8(&p, desc_end);
                language[1] = get8(&p, desc_end);
                language[2] = get8(&p, desc_end);
                language[3] = 0;
                break;
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            case REGISTRATION_DESCRIPTOR: /*MPEG-2 Registration descriptor */
                {
                    uint8_t bytes[4];
                    bytes[0] = get8(&p, desc_end);
                    bytes[1] = get8(&p, desc_end);
                    bytes[2] = get8(&p, desc_end);
                    bytes[3] = get8(&p, desc_end);
                    if(bytes[0] == 'd' && bytes[1] == 'r' &&
                       bytes[2] == 'a' && bytes[3] == 'c')
                        has_dirac_descr = 1;
                    break;
                }
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            default:
                break;
            }
            p = desc_end;
        }
        p = desc_list_end;
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#ifdef DEBUG_SI
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        av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",
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               stream_type, pid);
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#endif

        /* now create ffmpeg stream */
        switch(stream_type) {
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        case STREAM_TYPE_AUDIO_MPEG1:
        case STREAM_TYPE_AUDIO_MPEG2:
        case STREAM_TYPE_VIDEO_MPEG1:
        case STREAM_TYPE_VIDEO_MPEG2:
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        case STREAM_TYPE_VIDEO_MPEG4:
        case STREAM_TYPE_VIDEO_H264:
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        case STREAM_TYPE_VIDEO_VC1:
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        case STREAM_TYPE_VIDEO_DIRAC:
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        case STREAM_TYPE_AUDIO_AAC:
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        case STREAM_TYPE_AUDIO_AC3:
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        case STREAM_TYPE_AUDIO_DTS:
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        case STREAM_TYPE_AUDIO_HDMV_DTS:
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        case STREAM_TYPE_SUBTITLE_DVB:
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            if((stream_type == STREAM_TYPE_AUDIO_HDMV_DTS && !has_hdmv_descr)
            || (stream_type == STREAM_TYPE_VIDEO_DIRAC    && !has_dirac_descr))
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                break;
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            if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
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                pes= ts->pids[pid]->u.pes_filter.opaque;
                st= pes->st;
            }else{
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                if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
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                pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
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                if (pes)
                    st = new_pes_av_stream(pes, 0);
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            }
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            add_pid_to_pmt(ts, h->id, pid);
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            if(st)
                av_program_add_stream_index(ts->stream, h->id, st->index);
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            break;
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        default:
            /* we ignore the other streams */
            break;
        }
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        if (st) {
            if (language[0] != 0) {
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                av_metadata_set(&st->metadata, "language", language);
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            }

            if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
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                st->codec->sub_id = (anc_page << 16) | comp_page;
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            }
        }
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    }
    /* all parameters are there */
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    ts->stop_parse++;
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    mpegts_close_filter(ts, filter);
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}

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static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
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{
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    MpegTSContext *ts = filter->u.section_filter.opaque;
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    SectionHeader h1, *h = &h1;
    const uint8_t *p, *p_end;
    int sid, pmt_pid;

#ifdef DEBUG_SI
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    av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
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    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
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#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;

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    clear_programs(ts);
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    for(;;) {
        sid = get16(&p, p_end);
        if (sid < 0)
            break;
        pmt_pid = get16(&p, p_end) & 0x1fff;
        if (pmt_pid < 0)
            break;
#ifdef DEBUG_SI
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        av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
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#endif
        if (sid == 0x0000) {
            /* NIT info */
        } else {
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            av_new_program(ts->stream, sid);
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            ts->stop_parse--;
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            mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
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            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);
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        }
    }
    /* not found */
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    ts->stop_parse++;
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    mpegts_close_filter(ts, filter);
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}

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static void mpegts_set_service(MpegTSContext *ts)
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{
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    mpegts_open_section_filter(ts, PAT_PID,
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                                                pat_cb, ts, 1);
}

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static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
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{
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    MpegTSContext *ts = filter->u.section_filter.opaque;
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    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_SI
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    av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");
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    av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
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#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;
#ifdef DEBUG_SI
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            av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
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                   desc_tag, desc_len);
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#endif
            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);
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                if (name) {
                    AVProgram *program = av_new_program(ts->stream, sid);
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                    if(program) {
                        av_metadata_set(&program->metadata, "name", name);
                        av_metadata_set(&program->metadata, "provider_name", provider_name);
                    }
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                }
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                av_free(name);
                av_free(provider_name);
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                break;
            default:
                break;
            }
            p = desc_end;
        }
        p = desc_list_end;
    }
}

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/* scan services in a transport stream by looking at the SDT */
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static void mpegts_scan_sdt(MpegTSContext *ts)
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{
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    mpegts_open_section_filter(ts, SDT_PID,
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                                                sdt_cb, ts, 1);
}

static int64_t get_pts(const uint8_t *p)
{
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    int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
    pts |= (AV_RB16(p + 1) >> 1) << 15;
    pts |=  AV_RB16(p + 3) >> 1;
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    return pts;
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}

/* return non zero if a packet could be constructed */
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static void mpegts_push_data(MpegTSFilter *filter,
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                             const uint8_t *buf, int buf_size, int is_start,
                             int64_t pos)
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{
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    PESContext *pes = filter->u.pes_filter.opaque;
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    MpegTSContext *ts = pes->ts;
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    const uint8_t *p;
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    int len, code;
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    if(!ts->pkt)
        return;

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    if (is_start) {
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        pes->state = MPEGTS_HEADER;
        pes->data_index = 0;
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        pes->ts_packet_pos = pos;
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    }
    p = buf;
    while (buf_size > 0) {
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        switch(pes->state) {
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        case MPEGTS_HEADER:
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            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;
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            p += len;
            buf_size -= len;
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            if (pes->data_index == PES_START_SIZE) {
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                /* we got all the PES or section header. We can now
                   decide */
#if 0
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                av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
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#endif
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                if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
                    pes->header[2] == 0x01) {
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                    /* it must be an mpeg2 PES stream */
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                    code = pes->header[3] | 0x100;
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                    if (!pes->st ||
                        !((code >= 0x1c0 && code <= 0x1df) ||
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                          (code >= 0x1e0 && code <= 0x1ef) ||
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                          (code == 0x1bd) || (code == 0x1fd)))
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                        goto skip;
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                    pes->state = MPEGTS_PESHEADER_FILL;
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                    pes->total_size = AV_RB16(pes->header + 4);
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                    /* NOTE: a zero total size means the PES size is
                       unbounded */
                    if (pes->total_size)
                        pes->total_size += 6;
                    pes->pes_header_size = pes->header[8] + 9;
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                } else {
                    /* otherwise, it should be a table */
                    /* skip packet */
                skip:
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                    pes->state = MPEGTS_SKIP;
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                    continue;
                }
            }
            break;
            /**********************************************/
            /* PES packing parsing */
        case MPEGTS_PESHEADER_FILL:
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            len = pes->pes_header_size - pes->data_index;
            if (len > buf_size)
                len = buf_size;
            memcpy(pes->header + pes->data_index, p, len);
            pes->data_index += len;
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            p += len;
            buf_size -= len;
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            if (pes->data_index == pes->pes_header_size) {
                const uint8_t *r;
                unsigned int flags;

                flags = pes->header[7];
                r = pes->header + 9;
                pes->pts = AV_NOPTS_VALUE;
                pes->dts = AV_NOPTS_VALUE;
                if ((flags & 0xc0) == 0x80) {
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                    pes->dts = pes->pts = get_pts(r);
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                    r += 5;
                } else if ((flags & 0xc0) == 0xc0) {
                    pes->pts = get_pts(r);
                    r += 5;
                    pes->dts = get_pts(r);
                    r += 5;
                }
                /* we got the full header. We parse it and get the payload */
                pes->state = MPEGTS_PAYLOAD;
            }
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            break;
        case MPEGTS_PAYLOAD:
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            if (pes->total_size) {
                len = pes->total_size - pes->data_index;
                if (len > buf_size)
                    len = buf_size;
            } else {
                len = buf_size;
            }
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            if (len > 0) {
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                AVPacket *pkt = ts->pkt;
                if (pes->st && av_new_packet(pkt, len) == 0) {
                    memcpy(pkt->data, p, len);
                    pkt->stream_index = pes->st->index;
                    pkt->pts = pes->pts;
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                    pkt->dts = pes->dts;
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                    /* store position of first TS packet of this PES packet */
                    pkt->pos = pes->ts_packet_pos;
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                    /* reset pts values */
                    pes->pts = AV_NOPTS_VALUE;
                    pes->dts = AV_NOPTS_VALUE;
                    ts->stop_parse = 1;
                    return;
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                }
            }
            buf_size = 0;
            break;
        case MPEGTS_SKIP:
            buf_size = 0;
            break;
        }
    }
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}

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static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
{
    AVStream *st;
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    enum CodecID codec_id;
    enum CodecType codec_type;
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