mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/*
|
|
* DERF 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 "avformat.h"
|
|
#include "internal.h"
|
|
#include "pcm.h"
|
|
|
|
static int derf_probe(const AVProbeData *p)
|
|
{
|
|
if (AV_RL32(p->buf) != MKTAG('D','E','R','F'))
|
|
return 0;
|
|
if (AV_RL32(p->buf+4) != 1 && AV_RL32(p->buf+4) != 2)
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX / 3 * 2;
|
|
}
|
|
|
|
static int derf_read_header(AVFormatContext *s)
|
|
{
|
|
unsigned data_size;
|
|
AVIOContext *pb = s->pb;
|
|
AVCodecParameters *par;
|
|
AVStream *st;
|
|
|
|
avio_skip(pb, 4);
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
par = st->codecpar;
|
|
par->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
par->codec_id = AV_CODEC_ID_DERF_DPCM;
|
|
par->format = AV_SAMPLE_FMT_S16;
|
|
par->channels = avio_rl32(pb);
|
|
if (par->channels != 1 && par->channels != 2)
|
|
return AVERROR_INVALIDDATA;
|
|
if (par->channels == 1)
|
|
par->channel_layout = AV_CH_LAYOUT_MONO;
|
|
else if (par->channels == 2)
|
|
par->channel_layout = AV_CH_LAYOUT_STEREO;
|
|
data_size = avio_rl32(pb);
|
|
st->duration = data_size / par->channels;
|
|
par->sample_rate = 22050;
|
|
par->block_align = 1;
|
|
|
|
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_derf_demuxer = {
|
|
.name = "derf",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Xilam DERF"),
|
|
.read_probe = derf_probe,
|
|
.read_header = derf_read_header,
|
|
.read_packet = ff_pcm_read_packet,
|
|
.read_seek = ff_pcm_read_seek,
|
|
.extensions = "adp",
|
|
};
|