mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-30 06:50:44 +00:00
120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 2009 Michael Niedermayer
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
|
|
static int probe(AVProbeData *p)
|
|
{
|
|
// the single file I have starts with that, I do not 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)
|
|
{
|
|
AVStream *st;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = CODEC_ID_MPEG4;
|
|
st->need_parsing = AVSTREAM_PARSE_FULL;
|
|
avpriv_set_pts_info(st, 64, 1, 90000);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int ret, size, pts, type, flags;
|
|
int first_pkt = 0;
|
|
int frame_complete = 0;
|
|
|
|
while (!frame_complete) {
|
|
|
|
type = avio_rb16(s->pb); // 257 or 258
|
|
size = avio_rb16(s->pb);
|
|
flags = avio_rb16(s->pb); //some flags, 0x80 indicates end of frame
|
|
avio_rb16(s->pb); //packet number
|
|
pts = avio_rb32(s->pb);
|
|
avio_rb32(s->pb); //6A 13 E3 88
|
|
|
|
frame_complete = flags & 0x80;
|
|
|
|
size -= 12;
|
|
if (size < 1)
|
|
return -1;
|
|
|
|
if (type == 258) {
|
|
avio_skip(s->pb, size);
|
|
frame_complete = 0;
|
|
continue;
|
|
}
|
|
|
|
if (!first_pkt) {
|
|
ret = av_get_packet(s->pb, pkt, size);
|
|
if (ret < 0)
|
|
return ret;
|
|
first_pkt = 1;
|
|
pkt->pts = pts;
|
|
pkt->pos -= 16;
|
|
} else {
|
|
ret = av_append_packet(s->pb, pkt, size);
|
|
if (ret < 0) {
|
|
av_log(s, AV_LOG_ERROR, "failed to grow packet\n");
|
|
av_free_packet(pkt);
|
|
return ret;
|
|
}
|
|
}
|
|
if (ret < size) {
|
|
av_log(s, AV_LOG_ERROR, "Truncated packet! Read %d of %d bytes\n",
|
|
ret, size);
|
|
pkt->flags |= AV_PKT_FLAG_CORRUPT;
|
|
break;
|
|
}
|
|
}
|
|
pkt->stream_index = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_iv8_demuxer = {
|
|
.name = "iv8",
|
|
.long_name = NULL_IF_CONFIG_SMALL("A format generated by IndigoVision 8000 video server"),
|
|
.read_probe = probe,
|
|
.read_header = read_header,
|
|
.read_packet = read_packet,
|
|
.flags= AVFMT_GENERIC_INDEX,
|
|
.value = CODEC_ID_MPEG4,
|
|
};
|