static int dvbsub_parse(AVCodecParserContext *s,

                        AVCodecContext *avctx,

                        const uint8_t **poutbuf, int *poutbuf_size,

                        const uint8_t *buf, int buf_size)

{

    DVBSubParseContext *pc = s->priv_data;

    uint8_t *p, *p_end;

    int i, len, buf_pos = 0;



    av_dlog(avctx, "DVB parse packet pts=%"PRIx64", lpts=%"PRIx64", cpts=%"PRIx64":\n",

            s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]);



    for (i=0; i < buf_size; i++)

    {

        av_dlog(avctx, "%02x ", buf[i]);

        if (i % 16 == 15)

            av_dlog(avctx, "\n");

    }



    if (i % 16 != 0)

        av_dlog(avctx, "\n");



    *poutbuf = NULL;

    *poutbuf_size = 0;



    s->fetch_timestamp = 1;



    if (s->last_pts != s->pts && s->pts != AV_NOPTS_VALUE) 

    {

        if (pc->packet_index != pc->packet_start)

        {

            av_dlog(avctx, "Discarding %d bytes\n",

                    pc->packet_index - pc->packet_start);

        }



        pc->packet_start = 0;

        pc->packet_index = 0;



        if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) {

            av_dlog(avctx, "Bad packet header\n");

            return -1;

        }



        buf_pos = 2;



        pc->in_packet = 1;

    } else {

        if (pc->packet_start != 0)

        {

            if (pc->packet_index != pc->packet_start)

            {

                memmove(pc->packet_buf, pc->packet_buf + pc->packet_start,

                            pc->packet_index - pc->packet_start);



                pc->packet_index -= pc->packet_start;

                pc->packet_start = 0;

            } else {

                pc->packet_start = 0;

                pc->packet_index = 0;

            }

        }

    }



    if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE)

        return -1;





    if (pc->in_packet == 0)

        return buf_size;



    memcpy(pc->packet_buf + pc->packet_index, buf + buf_pos, buf_size - buf_pos);

    pc->packet_index += buf_size - buf_pos;



    p = pc->packet_buf;

    p_end = pc->packet_buf + pc->packet_index;



    while (p < p_end)

    {

        if (*p == 0x0f)

        {

            if (p + 6 <= p_end)

            {

                len = AV_RB16(p + 4);



                if (p + len + 6 <= p_end)

                {

                    *poutbuf_size += len + 6;



                    p += len + 6;

                } else

                    break;

            } else

                break;

        } else if (*p == 0xff) {

            if (p + 1 < p_end)

            {

                av_dlog(avctx, "Junk at end of packet\n");

            }

            pc->packet_index = p - pc->packet_buf;

            pc->in_packet = 0;

            break;

        } else {

            av_log(avctx, AV_LOG_ERROR, "Junk in packet\n");



            pc->packet_index = p - pc->packet_buf;

            pc->in_packet = 0;

            break;

        }

    }



    if (*poutbuf_size > 0)

    {

        *poutbuf = pc->packet_buf;

        pc->packet_start = *poutbuf_size;

    }



    if (s->pts == AV_NOPTS_VALUE)

        s->pts = s->last_pts;



    return buf_size;

}
