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libavformat/iv8.c

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00001 /*
00002  * Copyright (c) 2009 Michael Niedermayer
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #include "avformat.h"
00022 
00023 
00024 static int probe(AVProbeData *p)
00025 {
00026     // the single file i have starts with that, i dont know if others do too
00027     if(   p->buf[0] == 1
00028        && p->buf[1] == 1
00029        && p->buf[2] == 3
00030        && p->buf[3] == 0xB8
00031        && p->buf[4] == 0x80
00032        && p->buf[5] == 0x60
00033       )
00034         return AVPROBE_SCORE_MAX-2;
00035 
00036     return 0;
00037 }
00038 
00039 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
00040 {
00041     AVStream *st;
00042 
00043     st = av_new_stream(s, 0);
00044     if (!st)
00045         return AVERROR(ENOMEM);
00046 
00047     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00048     st->codec->codec_id = CODEC_ID_MPEG4;
00049     st->need_parsing = AVSTREAM_PARSE_FULL;
00050     av_set_pts_info(st, 64, 1, 90000);
00051 
00052     return 0;
00053 
00054 }
00055 
00056 static int read_packet(AVFormatContext *s, AVPacket *pkt)
00057 {
00058     int ret, size, pts, type;
00059 retry:
00060     type= get_be16(s->pb); // 257 or 258
00061     size= get_be16(s->pb);
00062 
00063     get_be16(s->pb); //some flags, 0x80 indicates end of frame
00064     get_be16(s->pb); //packet number
00065     pts=get_be32(s->pb);
00066     get_be32(s->pb); //6A 13 E3 88
00067 
00068     size -= 12;
00069     if(size<1)
00070         return -1;
00071 
00072     if(type==258){
00073         url_fskip(s->pb, size);
00074         goto retry;
00075     }
00076 
00077     ret= av_get_packet(s->pb, pkt, size);
00078 
00079     pkt->pts= pts;
00080     pkt->pos-=16;
00081 
00082     pkt->stream_index = 0;
00083 
00084     return ret;
00085 }
00086 
00087 AVInputFormat iv8_demuxer = {
00088     "iv8",
00089     NULL_IF_CONFIG_SMALL("A format generated by IndigoVision 8000 video server"),
00090     0,
00091     probe,
00092     read_header,
00093     read_packet,
00094     .flags= AVFMT_GENERIC_INDEX,
00095     .value = CODEC_ID_MPEG4,
00096 };

Generated on Fri Sep 16 2011 17:17:48 for FFmpeg by  doxygen 1.7.1