PeerStreamer

/*

 * Copyright (c) 2009 Michael Niedermayer

 *

 * 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

 */

#include "avformat.h"

static int probe(AVProbeData *p)

{

    // the single file i have starts with that, i dont know if others do too

    if(   p->buf[0] == 1

       && p->buf[1] == 1

       && p->buf[2] == 3

       && p->buf[3] == 0xB8

       && p->buf[4] == 0x80

       && p->buf[5] == 0x60

      )

        return AVPROBE_SCORE_MAX-2;

    return 0;

}

static int read_header(AVFormatContext *s, AVFormatParameters *ap)

{

    AVStream *st;

    st = av_new_stream(s, 0);

    if (!st)

        return AVERROR(ENOMEM);

    st->codec->codec_type = CODEC_TYPE_VIDEO;

    st->codec->codec_id = CODEC_ID_MPEG4;

    st->need_parsing = AVSTREAM_PARSE_FULL;

    av_set_pts_info(st, 64, 1, 90000);

    return 0;

}

static int read_packet(AVFormatContext *s, AVPacket *pkt)

{

    int ret, size, pts, type;

retry:

    type= get_be16(s->pb); // 257 or 258

    size= get_be16(s->pb);

    get_be16(s->pb); //some flags, 0x80 indicates end of frame

    get_be16(s->pb); //packet number

    pts=get_be32(s->pb);

    get_be32(s->pb); //6A 13 E3 88

    size -= 12;

    if(size<1)

        return -1;

    if(type==258){

        url_fskip(s->pb, size);

        goto retry;

    }

    ret= av_get_packet(s->pb, pkt, size);

    pkt->pts= pts;

    pkt->pos-=16;

    pkt->stream_index = 0;

    return ret;

}

AVInputFormat iv8_demuxer = {

    "iv8",

    NULL_IF_CONFIG_SMALL("A format generated by IndigoVision 8000 video server"),

    0,

    probe,

    read_header,

    read_packet,

    .flags= AVFMT_GENERIC_INDEX,

    .value = CODEC_ID_MPEG4,

};