mpegts.c

/*
 * MPEG2 transport stream (aka DVB) demuxer
 * Copyright (c) 2002-2003 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

//#define DEBUG
//#define DEBUG_SEEK

#include "libavutil/crc.h"
#include "libavutil/intreadwrite.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "mpegts.h"
#include "internal.h"

/* 1.0 second at 24Mbit/s */
#define MAX_SCAN_PACKETS 32000

/* maximum size in which we look for synchronisation if
   synchronisation is lost */
#define MAX_RESYNC_SIZE 4096

#define MAX_PES_PAYLOAD 200*1024

typedef struct PESContext PESContext;

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

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_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;
    int pcr_pid; /**< if -1 then all packets containing PCR are considered */
    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;
    int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
    uint8_t header[MAX_PES_HEADER_SIZE];
    uint8_t *buffer;
};

extern AVInputFormat 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;
}

/**
 *  Assembles PES packets out of TS packets, and then calls 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;

    dprintf(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[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 CodecType codec_type;
    enum CodecID codec_id;
} StreamType;

static const StreamType ISO_types[] = {
    { 0x01, CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
    { 0x02, CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
    { 0x03, CODEC_TYPE_AUDIO,        CODEC_ID_MP3 },
    { 0x04, CODEC_TYPE_AUDIO,        CODEC_ID_MP3 },
    { 0x0f, CODEC_TYPE_AUDIO,        CODEC_ID_AAC },
    { 0x10, CODEC_TYPE_VIDEO,      CODEC_ID_MPEG4 },
    { 0x1b, CODEC_TYPE_VIDEO,       CODEC_ID_H264 },
    { 0xd1, CODEC_TYPE_VIDEO,      CODEC_ID_DIRAC },
    { 0xea, CODEC_TYPE_VIDEO,        CODEC_ID_VC1 },
    { 0 },
};

static const StreamType HDMV_types[] = {
    { 0x81, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
    { 0x82, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
    { 0 },
};

/* ATSC ? */
static const StreamType MISC_types[] = {
    { 0x81, CODEC_TYPE_AUDIO,   CODEC_ID_AC3 },
    { 0x8a, CODEC_TYPE_AUDIO,   CODEC_ID_DTS },
    { 0 },
};

static const StreamType REGD_types[] = {
    { MKTAG('d','r','a','c'), CODEC_TYPE_VIDEO, CODEC_ID_DIRAC },
    { MKTAG('A','C','-','3'), CODEC_TYPE_AUDIO,   CODEC_ID_AC3 },
    { 0 },
};

/* descriptor present */
static const StreamType DESC_types[] = {
    { 0x6a, CODEC_TYPE_AUDIO,             CODEC_ID_AC3 }, /* AC-3 descriptor */
    { 0x7a, CODEC_TYPE_AUDIO,             CODEC_ID_AC3 },
    { 0x7b, CODEC_TYPE_AUDIO,             CODEC_ID_DTS },
    { 0x59, CODEC_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
};

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 AVStream *new_pes_av_stream(PESContext *pes, uint32_t prog_reg_desc, uint32_t code)
{
    AVStream *st = av_new_stream(pes->stream, pes->pid);

    if (!st)
        return NULL;

    av_set_pts_info(st, 33, 1, 90000);
    st->priv_data = pes;
    st->codec->codec_type = CODEC_TYPE_DATA;
    st->codec->codec_id   = CODEC_ID_PROBE;
    st->need_parsing = AVSTREAM_PARSE_FULL;
    pes->st = st;

    dprintf(pes->stream, "stream_type=%x pid=%x prog_reg_desc=%.4s\n",
            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_PROBE)
        mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
    if (st->codec->codec_id == CODEC_ID_PROBE)
        mpegts_find_stream_type(st, pes->stream_type, MISC_types);

    /* stream was not present in PMT, guess based on PES start code */
    if (st->codec->codec_id == CODEC_ID_PROBE) {
        if (code >= 0x1c0 && code <= 0x1df) {
            st->codec->codec_type = CODEC_TYPE_AUDIO;
            st->codec->codec_id = CODEC_ID_MP2;
        } else if (code == 0x1bd) {
            st->codec->codec_type = CODEC_TYPE_AUDIO;
            st->codec->codec_id = CODEC_ID_AC3;
        }
    }

    return st;
}

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, *desc_end;
    int program_info_length, pcr_pid, pid, stream_type;
    int desc_list_len, desc_len, desc_tag;
    int comp_page, anc_page;
    char language[4];
    uint32_t prog_reg_desc = 0; /* registration descriptor */

#ifdef DEBUG
    dprintf(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;

    dprintf(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);

    dprintf(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);
        if(len > program_info_length - 2)
            //something else is broken, exit the program_descriptors_loop
            break;
        program_info_length -= len + 2;
        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)
        return;
    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;
            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, stream_type);
            if (pes)
                st = new_pes_av_stream(pes, prog_reg_desc, 0);
        }

        if (!st)
            return;

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

        av_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(;;) {
            desc_tag = get8(&p, desc_list_end);
            if (desc_tag < 0)
                break;
            desc_len = get8(&p, desc_list_end);
            if (desc_len < 0)
                break;
            desc_end = p + desc_len;
            if (desc_end > desc_list_end)
                break;

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

            if (st->codec->codec_id == CODEC_ID_PROBE &&
                stream_type == STREAM_TYPE_PRIVATE_DATA)
                mpegts_find_stream_type(st, desc_tag, DESC_types);

            switch(desc_tag) {
            case 0x59: /* subtitling descriptor */
                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);
                st->codec->sub_id = (anc_page << 16) | comp_page;
                av_metadata_set(&st->metadata, "language", language);
                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;
                av_metadata_set(&st->metadata, "language", language);
                break;
            case 0x05: /* registration descriptor */
                st->codec->codec_tag = bytestream_get_le32(&p);
                if (st->codec->codec_id == CODEC_ID_PROBE &&
                    stream_type == STREAM_TYPE_PRIVATE_DATA)
                    mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
                break;
            default:
                break;
            }
            p = desc_end;
        }
        p = desc_list_end;
    }
    /* all parameters are there */
    ts->stop_parse++;
    mpegts_close_filter(ts, filter);
}

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
    dprintf(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;

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

        if (sid == 0x0000) {
            /* NIT info */
        } else {
            av_new_program(ts->stream, sid);
            ts->stop_parse--;
            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);
        }
    }
    /* not found */
    ts->stop_parse++;

    mpegts_close_filter(ts, filter);
}

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
    dprintf(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;

            dprintf(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_set(&program->metadata, "name", name);
                        av_metadata_set(&program->metadata, "provider_name", provider_name);
                    }
                }
                av_free(name);
                av_free(provider_name);
                break;
            default:
                break;
            }
            p = desc_end;
        }
        p = desc_list_end;
    }
}

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

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);

    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 0
                av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
#endif
                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;

                    /* stream not present in PMT */
                    if (!pes->st)
                        pes->st = new_pes_av_stream(pes, 0, code);
                    if (!pes->st)
                        return AVERROR(ENOMEM);

                    if (pes->st->discard == AVDISCARD_ALL ||
                        !((code >= 0x1c0 && code <= 0x1df) ||
                          (code >= 0x1e0 && code <= 0x1ef) ||
                          (code == 0x1bd) || (code == 0x1fd)))
                        goto skip;
                    pes->state = MPEGTS_PESHEADER_FILL;
                    pes->total_size = AV_RB16(pes->header + 4);
                    /* NOTE: a zero total size means the PES size is
                       unbounded */
                    pes->pes_header_size = pes->header[8] + 9;
                } else {
                    /* otherwise, it should be a table */
                    /* skip packet */
                skip:
                    pes->state = MPEGTS_SKIP;
                    continue;
                }
            }
            break;
            /**********************************************/
            /* PES packing parsing */
        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;

                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 = get_pts(r);
                    r += 5;
                } else if ((flags & 0xc0) == 0xc0) {
                    pes->pts = get_pts(r);
                    r += 5;
                    pes->dts = get_pts(r);
                    r += 5;
                }

                if (pes->total_size > pes->data_index - 6)
                    pes->total_size -= pes->data_index - 6;
                else
                    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);

                /* 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) {
                if (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);