mpegts.c

                    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) {
                            dprintf(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 = get_pts(r);
                    r += 5;
                } else if ((flags & 0xc0) == 0xc0) {
                    pes->pts = get_pts(r);
                    r += 5;
                    pes->dts = get_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+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;
                }
                memcpy(pes->buffer+pes->data_index, p, buf_size);
                pes->data_index += buf_size;
            }
            buf_size = 0;
            break;
        case MPEGTS_SKIP:
            buf_size = 0;
            break;
        }
    }

    return 0;
}

static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
{
    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->stream_type = stream_type;
    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;
}

/* 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, 0);
        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 = url_ftell(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)
{
    ByteIOContext *pb = s->pb;
    int c, i;

    for(i = 0;i < MAX_RESYNC_SIZE; i++) {
        c = url_fgetc(pb);
        if (c < 0)
            return -1;
        if (c == 0x47) {
            url_fseek(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)
{
    ByteIOContext *pb = s->pb;
    int skip, len;

    for(;;) {
        len = get_buffer(pb, buf, TS_PACKET_SIZE);
        if (len != TS_PACKET_SIZE)
            return AVERROR(EIO);
        /* check paquet sync byte */
        if (buf[0] != 0x47) {
            /* find a new packet start */
            url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
            if (mpegts_resync(s) < 0)
                return AVERROR(EAGAIN);
            else
                continue;
        } else {
            skip = raw_packet_size - TS_PACKET_SIZE;
            if (skip > 0)
                url_fskip(pb, skip);
            break;
        }
    }
    return 0;
}

static int handle_packets(MpegTSContext *ts, int nb_packets)
{
    AVFormatContext *s = ts->stream;
    uint8_t packet[TS_PACKET_SIZE];
    int packet_num, ret;

    ts->stop_parse = 0;
    packet_num = 0;
    for(;;) {
        if (ts->stop_parse>0)
            break;
        packet_num++;
        if (nb_packets != 0 && packet_num >= nb_packets)
            break;
        ret = read_packet(s, packet, ts->raw_packet_size);
        if (ret != 0)
            return ret;
        ret = handle_packet(ts, packet);
        if (ret != 0)
            return ret;
    }
    return 0;
}

static int mpegts_probe(AVProbeData *p)
{
#if 1
    const int size= p->buf_size;
    int score, fec_score, dvhs_score;
    int check_count= size / TS_FEC_PACKET_SIZE;
#define CHECK_COUNT 10

    if (check_count < CHECK_COUNT)
        return -1;

    score     = analyze(p->buf, TS_PACKET_SIZE     *check_count, TS_PACKET_SIZE     , NULL)*CHECK_COUNT/check_count;
    dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
    fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
//    av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);

// we need a clear definition for the returned score otherwise things will become messy sooner or later
    if     (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score     - CHECK_COUNT;
    else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score  - CHECK_COUNT;
    else if(                 fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
    else                                    return -1;
#else
    /* only use the extension for safer guess */
    if (match_ext(p->filename, "ts"))
        return AVPROBE_SCORE_MAX;
    else
        return 0;
#endif
}

/* return the 90kHz PCR and the extension for the 27MHz PCR. return
   (-1) if not available */
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
                     const uint8_t *packet)
{
    int afc, len, flags;
    const uint8_t *p;
    unsigned int v;

    afc = (packet[3] >> 4) & 3;
    if (afc <= 1)
        return -1;
    p = packet + 4;
    len = p[0];
    p++;
    if (len == 0)
        return -1;
    flags = *p++;
    len--;
    if (!(flags & 0x10))
        return -1;
    if (len < 6)
        return -1;
    v = AV_RB32(p);
    *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
    *ppcr_low = ((p[4] & 1) << 8) | p[5];
    return 0;
}

static int mpegts_read_header(AVFormatContext *s,
                              AVFormatParameters *ap)
{
    MpegTSContext *ts = s->priv_data;
    ByteIOContext *pb = s->pb;
    uint8_t buf[5*1024];
    int len;
    int64_t pos;

    if (ap) {
        ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
        if(ap->mpeg2ts_raw){
            av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
            return -1;
        }
    }

    /* read the first 1024 bytes to get packet size */
    pos = url_ftell(pb);
    len = get_buffer(pb, buf, sizeof(buf));
    if (len != sizeof(buf))
        goto fail;
    ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
    if (ts->raw_packet_size <= 0)
        goto fail;
    ts->stream = s;
    ts->auto_guess = 0;

    if (s->iformat == &mpegts_demuxer) {
        /* normal demux */

        /* first do a scaning to get all the services */
        url_fseek(pb, pos, SEEK_SET);

        mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);

        mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);

        handle_packets(ts, s->probesize / ts->raw_packet_size);
        /* if could not find service, enable auto_guess */

        ts->auto_guess = 1;

        dprintf(ts->stream, "tuning done\n");

        s->ctx_flags |= AVFMTCTX_NOHEADER;
    } else {
        AVStream *st;
        int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
        int64_t pcrs[2], pcr_h;
        int packet_count[2];
        uint8_t packet[TS_PACKET_SIZE];

        /* only read packets */

        st = av_new_stream(s, 0);
        if (!st)
            goto fail;
        av_set_pts_info(st, 60, 1, 27000000);
        st->codec->codec_type = CODEC_TYPE_DATA;
        st->codec->codec_id = CODEC_ID_MPEG2TS;

        /* we iterate until we find two PCRs to estimate the bitrate */
        pcr_pid = -1;
        nb_pcrs = 0;
        nb_packets = 0;
        for(;;) {
            ret = read_packet(s, packet, ts->raw_packet_size);
            if (ret < 0)
                return -1;
            pid = AV_RB16(packet + 1) & 0x1fff;
            if ((pcr_pid == -1 || pcr_pid == pid) &&
                parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
                pcr_pid = pid;
                packet_count[nb_pcrs] = nb_packets;
                pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
                nb_pcrs++;
                if (nb_pcrs >= 2)
                    break;
            }
            nb_packets++;
        }

        /* NOTE1: the bitrate is computed without the FEC */
        /* NOTE2: it is only the bitrate of the start of the stream */
        ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
        ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
        s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
        st->codec->bit_rate = s->bit_rate;
        st->start_time = ts->cur_pcr;
#if 0
        av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
               st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
#endif
    }

    url_fseek(pb, pos, SEEK_SET);
    return 0;
 fail:
    return -1;
}

#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)

static int mpegts_raw_read_packet(AVFormatContext *s,
                                  AVPacket *pkt)
{
    MpegTSContext *ts = s->priv_data;
    int ret, i;
    int64_t pcr_h, next_pcr_h, pos;
    int pcr_l, next_pcr_l;
    uint8_t pcr_buf[12];

    if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
        return AVERROR(ENOMEM);
    pkt->pos= url_ftell(s->pb);
    ret = read_packet(s, pkt->data, ts->raw_packet_size);
    if (ret < 0) {
        av_free_packet(pkt);
        return ret;
    }
    if (ts->mpeg2ts_compute_pcr) {
        /* compute exact PCR for each packet */
        if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
            /* we read the next PCR (XXX: optimize it by using a bigger buffer */
            pos = url_ftell(s->pb);
            for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
                url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
                get_buffer(s->pb, pcr_buf, 12);
                if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
                    /* XXX: not precise enough */
                    ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
                        (i + 1);
                    break;
                }
            }
            url_fseek(s->pb, pos, SEEK_SET);
            /* no next PCR found: we use previous increment */
            ts->cur_pcr = pcr_h * 300 + pcr_l;
        }
        pkt->pts = ts->cur_pcr;
        pkt->duration = ts->pcr_incr;
        ts->cur_pcr += ts->pcr_incr;
    }
    pkt->stream_index = 0;
    return 0;
}

static int mpegts_read_packet(AVFormatContext *s,
                              AVPacket *pkt)
{
    MpegTSContext *ts = s->priv_data;
    int ret, i;

    if (url_ftell(s->pb) != ts->last_pos) {
        /* seek detected, flush pes buffer */
        for (i = 0; i < NB_PID_MAX; i++) {
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
                av_freep(&pes->buffer);
                pes->data_index = 0;
                pes->state = MPEGTS_SKIP; /* skip until pes header */
            }
        }
    }

    ts->pkt = pkt;
    ret = handle_packets(ts, 0);
    if (ret < 0) {
        /* flush pes data left */
        for (i = 0; i < NB_PID_MAX; i++) {
            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
                if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
                    new_pes_packet(pes, pkt);
                    pes->state = MPEGTS_SKIP;
                    ret = 0;
                    break;
                }
            }
        }
    }

    ts->last_pos = url_ftell(s->pb);

    return ret;
}

static int mpegts_read_close(AVFormatContext *s)
{
    MpegTSContext *ts = s->priv_data;
    int i;

    clear_programs(ts);

    for(i=0;i<NB_PID_MAX;i++)
        if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);

    return 0;
}

static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
                              int64_t *ppos, int64_t pos_limit)
{
    MpegTSContext *ts = s->priv_data;
    int64_t pos, timestamp;
    uint8_t buf[TS_PACKET_SIZE];
    int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
    const int find_next= 1;
    pos = ((*ppos  + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
    if (find_next) {
        for(;;) {
            url_fseek(s->pb, pos, SEEK_SET);
            if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
                return AV_NOPTS_VALUE;
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
                break;
            }
            pos += ts->raw_packet_size;
        }
    } else {
        for(;;) {
            pos -= ts->raw_packet_size;
            if (pos < 0)
                return AV_NOPTS_VALUE;
            url_fseek(s->pb, pos, SEEK_SET);
            if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
                return AV_NOPTS_VALUE;
            if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
                parse_pcr(&timestamp, &pcr_l, buf) == 0) {
                break;
            }
        }
    }
    *ppos = pos;

    return timestamp;
}

#ifdef USE_SYNCPOINT_SEARCH

static int read_seek2(AVFormatContext *s,
                      int stream_index,
                      int64_t min_ts,
                      int64_t target_ts,
                      int64_t max_ts,
                      int flags)
{
    int64_t pos;

    int64_t ts_ret, ts_adj;
    int stream_index_gen_search;
    AVStream *st;
    AVParserState *backup;

    backup = ff_store_parser_state(s);

    // detect direction of seeking for search purposes
    flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
             AVSEEK_FLAG_BACKWARD : 0;

    if (flags & AVSEEK_FLAG_BYTE) {
        // use position directly, we will search starting from it
        pos = target_ts;
    } else {
        // search for some position with good timestamp match
        if (stream_index < 0) {
            stream_index_gen_search = av_find_default_stream_index(s);
            if (stream_index_gen_search < 0) {
                ff_restore_parser_state(s, backup);
                return -1;
            }

            st = s->streams[stream_index_gen_search];
            // timestamp for default must be expressed in AV_TIME_BASE units
            ts_adj = av_rescale(target_ts,
                                st->time_base.den,
                                AV_TIME_BASE * (int64_t)st->time_base.num);
        } else {
            ts_adj = target_ts;
            stream_index_gen_search = stream_index;
        }
        pos = av_gen_search(s, stream_index_gen_search, ts_adj,
                            0, INT64_MAX, -1,
                            AV_NOPTS_VALUE,
                            AV_NOPTS_VALUE,
                            flags, &ts_ret, mpegts_get_pcr);
        if (pos < 0) {
            ff_restore_parser_state(s, backup);
            return -1;
        }
    }

    // search for actual matching keyframe/starting position for all streams
    if (ff_gen_syncpoint_search(s, stream_index, pos,
                                min_ts, target_ts, max_ts,
                                flags) < 0) {
        ff_restore_parser_state(s, backup);
        return -1;
    }

    ff_free_parser_state(s, backup);
    return 0;
}

static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
{
    int ret;
    if (flags & AVSEEK_FLAG_BACKWARD) {
        flags &= ~AVSEEK_FLAG_BACKWARD;
        ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
        if (ret < 0)
            // for compatibility reasons, seek to the best-fitting timestamp
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
    } else {
        ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
        if (ret < 0)
            // for compatibility reasons, seek to the best-fitting timestamp
            ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
    }
    return ret;
}

#else

static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
    MpegTSContext *ts = s->priv_data;
    uint8_t buf[TS_PACKET_SIZE];
    int64_t pos;

    if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
        return -1;

    pos= url_ftell(s->pb);

    for(;;) {
        url_fseek(s->pb, pos, SEEK_SET);
        if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
            return -1;
//        pid = AV_RB16(buf + 1) & 0x1fff;
        if(buf[1] & 0x40) break;
        pos += ts->raw_packet_size;
    }
    url_fseek(s->pb, pos, SEEK_SET);

    return 0;
}

#endif

/**************************************************************/
/* parsing functions - called from other demuxers such as RTP */

MpegTSContext *mpegts_parse_open(AVFormatContext *s)
{
    MpegTSContext *ts;

    ts = av_mallocz(sizeof(MpegTSContext));
    if (!ts)
        return NULL;
    /* no stream case, currently used by RTP */
    ts->raw_packet_size = TS_PACKET_SIZE;
    ts->stream = s;
    ts->auto_guess = 1;
    return ts;
}

/* return the consumed length if a packet was output, or -1 if no
   packet is output */
int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
                        const uint8_t *buf, int len)
{
    int len1;

    len1 = len;
    ts->pkt = pkt;
    ts->stop_parse = 0;
    for(;;) {
        if (ts->stop_parse>0)
            break;
        if (len < TS_PACKET_SIZE)
            return -1;
        if (buf[0] != 0x47) {
            buf++;
            len--;
        } else {
            handle_packet(ts, buf);
            buf += TS_PACKET_SIZE;
            len -= TS_PACKET_SIZE;
        }
    }
    return len1 - len;
}

void mpegts_parse_close(MpegTSContext *ts)
{
    int i;

    for(i=0;i<NB_PID_MAX;i++)
        av_free(ts->pids[i]);
    av_free(ts);
}

AVInputFormat mpegts_demuxer = {
    "mpegts",
    NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
    sizeof(MpegTSContext),
    mpegts_probe,
    mpegts_read_header,
    mpegts_read_packet,
    mpegts_read_close,
    read_seek,
    mpegts_get_pcr,
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
#ifdef USE_SYNCPOINT_SEARCH
    .read_seek2 = read_seek2,
#endif
};

AVInputFormat mpegtsraw_demuxer = {
    "mpegtsraw",
    NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
    sizeof(MpegTSContext),
    NULL,
    mpegts_read_header,
    mpegts_raw_read_packet,
    mpegts_read_close,
    read_seek,
    mpegts_get_pcr,
    .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
#ifdef USE_SYNCPOINT_SEARCH
    .read_seek2 = read_seek2,
#endif
};