mirror of
https://github.com/nyanmisaka/ffmpeg-rockchip.git
synced 2025-10-31 12:36:41 +08:00
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/*
|
|
* SVS 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/channel_layout.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
static int svs_probe(const AVProbeData *p)
|
|
{
|
|
if (p->buf_size < 32)
|
|
return 0;
|
|
|
|
if (memcmp(p->buf, "SVS\00", 4))
|
|
return 0;
|
|
|
|
if (AV_RL32(p->buf + 16) == 0)
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX / 3;
|
|
}
|
|
|
|
static int svs_read_header(AVFormatContext *s)
|
|
{
|
|
AVStream *st;
|
|
uint32_t pitch;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
avio_skip(s->pb, 16);
|
|
pitch = avio_rl32(s->pb);
|
|
avio_skip(s->pb, 12);
|
|
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
|
|
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
|
|
st->codecpar->sample_rate = av_rescale_rnd(pitch, 48000, 4096, AV_ROUND_INF);
|
|
st->codecpar->block_align = 32;
|
|
st->start_time = 0;
|
|
if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
|
|
st->duration = av_get_audio_frame_duration2(st->codecpar,
|
|
avio_size(s->pb) - 32);
|
|
|
|
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int svs_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int ret;
|
|
|
|
if (avio_feof(s->pb))
|
|
return AVERROR_EOF;
|
|
|
|
ret = av_get_packet(s->pb, pkt, 32 * 256);
|
|
if (ret != 32 * 256) {
|
|
if (ret < 0)
|
|
return ret;
|
|
pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
|
|
}
|
|
pkt->stream_index = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
const AVInputFormat ff_svs_demuxer = {
|
|
.name = "svs",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Square SVS"),
|
|
.read_probe = svs_probe,
|
|
.read_header = svs_read_header,
|
|
.read_packet = svs_read_packet,
|
|
.extensions = "svs",
|
|
};
|