mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
b800327f4c
This commit does for AVInputFormat what commit59c9dc82f4did for AVOutputFormat: It adds a new type FFInputFormat, moves all the internals of AVInputFormat to it and adds a now reduced AVInputFormat as first member. This does not affect/improve extensibility of both public or private fields for demuxers (it is still a mess due to lavd). This is possible since50f34172e0(which removed the last usage of an internal field of AVInputFormat in fftools). (Hint: tools/probetest.c accesses the internals of FFInputFormat as well, but given that it is a testing tool this is not considered a problem.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
|
|
* XMD 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"
|
|
#include "pcm.h"
|
|
|
|
static int xmd_probe(const AVProbeData *p)
|
|
{
|
|
if ((AV_RL32(p->buf) & 0xFFFFFF) != MKTAG('x','m','d',0))
|
|
return 0;
|
|
if (p->buf[3] == 0 || p->buf[3] > 2 ||
|
|
AV_RL16(p->buf+4) == 0 ||
|
|
AV_RL32(p->buf+6) == 0)
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX / 3;
|
|
}
|
|
|
|
static int xmd_read_header(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
AVCodecParameters *par;
|
|
int channels;
|
|
AVStream *st;
|
|
|
|
avio_skip(pb, 3);
|
|
|
|
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_ADPCM_XMD;
|
|
channels = avio_r8(pb);
|
|
if (channels == 0)
|
|
return AVERROR_INVALIDDATA;
|
|
av_channel_layout_default(&par->ch_layout, channels);
|
|
par->sample_rate = avio_rl16(pb);
|
|
if (par->sample_rate <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
par->block_align = 21 * channels;
|
|
st->duration = (avio_rl32(pb) / par->block_align) * 32LL;
|
|
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
|
|
avio_skip(pb, 7);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const FFInputFormat ff_xmd_demuxer = {
|
|
.p.name = "xmd",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("Konami XMD"),
|
|
.p.flags = AVFMT_GENERIC_INDEX,
|
|
.p.extensions = "xmd",
|
|
.read_probe = xmd_probe,
|
|
.read_header = xmd_read_header,
|
|
.read_packet = ff_pcm_read_packet,
|
|
};
|