09c2d08c
 Hu Chunming
arm交付版
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/*
* 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,
};
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