aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* SDR2 demuxer
* Copyright (c) 2014 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 "avformat.h"
#include "internal.h"
static int sdr2_probe(const AVProbeData *p)
{
if (AV_RL32(p->buf) != MKTAG('S', 'R', 'A', 1))
return 0;
return AVPROBE_SCORE_EXTENSION;
}
#define FIRST 0xA8
static int sdr2_read_header(AVFormatContext *s)
{
AVStream *st, *ast;
ast = avformat_new_stream(s, 0);
if (!ast)
return AVERROR(ENOMEM);
st = avformat_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
avio_skip(s->pb, 20);
avpriv_set_pts_info(st, 64, 1, avio_rl32(s->pb));
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->width = avio_rl32(s->pb);
st->codecpar->height = avio_rl32(s->pb);
st->codecpar->codec_id = AV_CODEC_ID_H264;
st->need_parsing = AVSTREAM_PARSE_FULL;
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codecpar->channels = 1;
ast->codecpar->sample_rate = 8000;
ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
avpriv_set_pts_info(ast, 64, 1, 8000);
avio_seek(s->pb, FIRST, SEEK_SET);
return 0;
}
static const uint8_t header[24] = {
0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1e,
0xa6, 0x80, 0xb0, 0x7e, 0x40, 0x00, 0x00, 0x00,
0x01, 0x68, 0xce, 0x38, 0x80, 0x00, 0x00, 0x00
};
static int sdr2_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int64_t pos;
unsigned next;
int flags, ret = 0, is_video;
pos = avio_tell(s->pb);
flags = avio_rl32(s->pb);
avio_skip(s->pb, 4);
next = avio_rl32(s->pb);
if (next <= 52)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, 6);
is_video = avio_rl32(s->pb);
avio_skip(s->pb, 30);
if (pos == FIRST) {
if (av_new_packet(pkt, next - 52 + 24) < 0)
return AVERROR(ENOMEM);
memcpy(pkt->data, header, 24);
ret = avio_read(s->pb, pkt->data + 24, next - 52);
if (ret < 0) {
av_packet_unref(pkt);
return ret;
}
av_shrink_packet(pkt, ret + 24);
} else {
ret = av_get_packet(s->pb, pkt, next - 52);
}
pkt->stream_index = !!is_video;
pkt->pos = pos;
if (flags & (1 << 12))
pkt->flags |= AV_PKT_FLAG_KEY;
return ret;
}
AVInputFormat ff_sdr2_demuxer = {
.name = "sdr2",
.long_name = NULL_IF_CONFIG_SMALL("SDR2"),
.read_probe = sdr2_probe,
.read_header = sdr2_read_header,
.read_packet = sdr2_read_packet,
.extensions = "sdr2",
.flags = AVFMT_GENERIC_INDEX,
};
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