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ffmpeg / libavformat / iv8.c @ e356fc57

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/*
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 * Copyright (c) 2009 Michael Niedermayer
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 *
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 * This file is part of FFmpeg.
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 *
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 * 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
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 * 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
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 * 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 "avformat.h"
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static int probe(AVProbeData *p)
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{
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    // the single file i have starts with that, i dont know if others do too
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    if(   p->buf[0] == 1
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       && p->buf[1] == 1
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       && p->buf[2] == 3
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       && p->buf[3] == 0xB8
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       && p->buf[4] == 0x80
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       && p->buf[5] == 0x60
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      )
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        return AVPROBE_SCORE_MAX-2;
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    return 0;
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}
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static int read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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    AVStream *st;
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    st = av_new_stream(s, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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    st->codec->codec_id = CODEC_ID_MPEG4;
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    st->need_parsing = AVSTREAM_PARSE_FULL;
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    av_set_pts_info(st, 64, 1, 90000);
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    return 0;
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}
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static int read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    int ret, size, pts, type;
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retry:
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    type= avio_rb16(s->pb); // 257 or 258
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    size= avio_rb16(s->pb);
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    avio_rb16(s->pb); //some flags, 0x80 indicates end of frame
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    avio_rb16(s->pb); //packet number
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    pts=avio_rb32(s->pb);
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    avio_rb32(s->pb); //6A 13 E3 88
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    size -= 12;
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    if(size<1)
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        return -1;
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    if(type==258){
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        avio_seek(s->pb, size, SEEK_CUR);
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        goto retry;
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    }
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    ret= av_get_packet(s->pb, pkt, size);
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    pkt->pts= pts;
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    pkt->pos-=16;
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    pkt->stream_index = 0;
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    return ret;
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}
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AVInputFormat ff_iv8_demuxer = {
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    "iv8",
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    NULL_IF_CONFIG_SMALL("A format generated by IndigoVision 8000 video server"),
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    0,
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    probe,
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    read_header,
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    read_packet,
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    .flags= AVFMT_GENERIC_INDEX,
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    .value = CODEC_ID_MPEG4,
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};