mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*
|
|
* SDNS demuxer
|
|
* Copyright (c) 2023 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/channel_layout.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
#include "demux.h"
|
|
#include "internal.h"
|
|
|
|
static int sdns_probe(const AVProbeData *p)
|
|
{
|
|
if (AV_RL32(p->buf) != MKTAG('S','D','N','S'))
|
|
return 0;
|
|
if (AV_RB32(p->buf + 8) <= 0)
|
|
return 0;
|
|
if (AV_RB32(p->buf + 12) <= 0 ||
|
|
AV_RB32(p->buf + 12) > 128)
|
|
return 0;
|
|
return AVPROBE_SCORE_MAX / 3;
|
|
}
|
|
|
|
static int sdns_read_header(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
AVCodecParameters *par;
|
|
int channels, ret;
|
|
AVStream *st;
|
|
|
|
avio_skip(pb, 8);
|
|
|
|
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_XMA1;
|
|
par->sample_rate = avio_rb32(pb);
|
|
channels = avio_rb32(pb);
|
|
if (channels <= 0 || channels > 128)
|
|
return AVERROR_INVALIDDATA;
|
|
av_channel_layout_default(&par->ch_layout, channels);
|
|
if (par->sample_rate <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
par->block_align = 2048;
|
|
if ((ret = ff_alloc_extradata(par, 8 + 20 * ((channels + 1) / 2))) < 0)
|
|
return ret;
|
|
memset(par->extradata, 0, 28);
|
|
par->extradata[4] = (channels + 1) / 2;
|
|
for (int i = 0; i < par->extradata[4]; i++)
|
|
par->extradata[8 + 20 * i + 17] = FFMIN(2, channels - i * 2);
|
|
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
|
|
avio_seek(pb, 0x1000, SEEK_SET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sdns_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int ret;
|
|
|
|
if (avio_feof(s->pb))
|
|
return AVERROR_EOF;
|
|
ret = av_get_packet(s->pb, pkt, 2048);
|
|
pkt->stream_index = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
const AVInputFormat ff_sdns_demuxer = {
|
|
.name = "sdns",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Xbox SDNS"),
|
|
.read_probe = sdns_probe,
|
|
.read_header = sdns_read_header,
|
|
.read_packet = sdns_read_packet,
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
.extensions = "sdns",
|
|
};
|