mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-24 12:09:55 +00:00
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
/*
|
|
* CCTV DAT demuxer
|
|
*
|
|
* Copyright (c) 2020 Paul B Mahol
|
|
*
|
|
* 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 "libavutil/intreadwrite.h"
|
|
#include "avio_internal.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
static int dat_probe(const AVProbeData *p)
|
|
{
|
|
if (p->buf_size < 0x2080)
|
|
return 0;
|
|
|
|
if (memcmp(p->buf, "luo ", 4))
|
|
return 0;
|
|
|
|
if (memcmp(p->buf + 0x1ffc, " oulliu ", 8))
|
|
return 0;
|
|
|
|
if (!AV_RL32(p->buf + 0x2004))
|
|
return 0;
|
|
|
|
if (memcmp(p->buf + 0x207c, " uil", 4))
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int dat_read_header(AVFormatContext *s)
|
|
{
|
|
s->ctx_flags |= AVFMTCTX_NOHEADER;
|
|
|
|
avio_seek(s->pb, 0x2000, SEEK_SET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dat_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
int index, ret, key, stream_id, stream_index, width, height, fps, pkt_size;
|
|
int64_t pts, pos = avio_tell(pb);
|
|
|
|
if (avio_feof(pb))
|
|
return AVERROR_EOF;
|
|
|
|
if (avio_rb32(pb) != MKBETAG('l', 'i', 'u', ' '))
|
|
return AVERROR_INVALIDDATA;
|
|
stream_id = avio_rl32(pb);
|
|
width = avio_rl32(pb);
|
|
height = avio_rl32(pb);
|
|
fps = avio_rl32(pb);
|
|
avio_skip(pb, 16);
|
|
key = avio_rl32(pb) == 1;
|
|
avio_skip(pb, 4);
|
|
index = avio_rl32(pb);
|
|
avio_skip(pb, 4);
|
|
pts = avio_rl64(pb);
|
|
pkt_size = avio_rl32(pb);
|
|
avio_skip(pb, 64);
|
|
|
|
if (pkt_size == 0)
|
|
return AVERROR_EOF;
|
|
|
|
for (stream_index = 0; stream_index < s->nb_streams; stream_index++) {
|
|
if (s->streams[stream_index]->id == stream_id)
|
|
break;
|
|
}
|
|
|
|
if (stream_index == s->nb_streams) {
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->id = stream_id;
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_H264;
|
|
st->codecpar->width = width;
|
|
st->codecpar->height = height;
|
|
avpriv_set_pts_info(st, 64, 1, fps);
|
|
}
|
|
|
|
if (index >= s->nb_streams)
|
|
av_log(s, AV_LOG_WARNING, "Stream index out of range.\n");
|
|
|
|
ret = av_get_packet(pb, pkt, pkt_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
pkt->pos = pos;
|
|
pkt->pts = pts;
|
|
pkt->stream_index = stream_index;
|
|
if (key)
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
|
|
return ret;
|
|
}
|
|
|
|
AVInputFormat ff_luodat_demuxer = {
|
|
.name = "luodat",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Video CCTV DAT"),
|
|
.read_probe = dat_probe,
|
|
.read_header = dat_read_header,
|
|
.read_packet = dat_read_packet,
|
|
.extensions = "dat",
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|