mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-21 06:50:44 +00:00
105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
/*
|
|
* Ensoniq Paris Audio File demuxer
|
|
* Copyright (c) 2012 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 epaf_probe(AVProbeData *p)
|
|
{
|
|
if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') &&
|
|
AV_RL32(p->buf + 8) == 1) ||
|
|
(AV_RL32(p->buf) == MKTAG(' ','p','a','f') &&
|
|
AV_RN32(p->buf + 8) == 0)) &&
|
|
!AV_RN32(p->buf + 4) && AV_RN32(p->buf + 12) &&
|
|
AV_RN32(p->buf + 20))
|
|
return AVPROBE_SCORE_MAX / 4 * 3;
|
|
return 0;
|
|
}
|
|
|
|
static int epaf_read_header(AVFormatContext *s)
|
|
{
|
|
int le, sample_rate, codec, channels;
|
|
AVStream *st;
|
|
|
|
avio_skip(s->pb, 4);
|
|
if (avio_rl32(s->pb))
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
le = avio_rl32(s->pb);
|
|
if (le && le != 1)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (le) {
|
|
sample_rate = avio_rl32(s->pb);
|
|
codec = avio_rl32(s->pb);
|
|
channels = avio_rl32(s->pb);
|
|
} else {
|
|
sample_rate = avio_rb32(s->pb);
|
|
codec = avio_rb32(s->pb);
|
|
channels = avio_rb32(s->pb);
|
|
}
|
|
|
|
if (!channels || !sample_rate)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->channels = channels;
|
|
st->codec->sample_rate = sample_rate;
|
|
switch (codec) {
|
|
case 0:
|
|
st->codec->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;
|
|
break;
|
|
case 2:
|
|
st->codec->codec_id = AV_CODEC_ID_PCM_S8;
|
|
break;
|
|
case 1:
|
|
avpriv_request_sample(s, "24-bit Paris PCM format");
|
|
default:
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
|
|
st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
|
|
|
|
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
|
|
|
|
if (avio_skip(s->pb, 2024) < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_epaf_demuxer = {
|
|
.name = "epaf",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"),
|
|
.read_probe = epaf_probe,
|
|
.read_header = epaf_read_header,
|
|
.read_packet = ff_pcm_read_packet,
|
|
.read_seek = ff_pcm_read_seek,
|
|
.extensions = "paf,fap",
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|