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/*
* ACM demuxer
* Copyright (c) 2015 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 "rawdec.h"
#include "internal.h"
static int acm_probe(AVProbeData *p)
{
if (AV_RB32(p->buf) != 0x97280301)
return 0;
return AVPROBE_SCORE_MAX / 3 * 2;
}
static int acm_read_header(AVFormatContext *s)
{
AVStream *st;
int ret;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = AV_CODEC_ID_INTERPLAY_ACM;
ff_alloc_extradata(st->codec, 14);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
ret = avio_read(s->pb, st->codec->extradata, 14);
if (ret < 10)
return ret < 0 ? ret : AVERROR_EOF;
st->codec->channels = AV_RL16(st->codec->extradata + 8);
st->codec->sample_rate = AV_RL16(st->codec->extradata + 10);
if (st->codec->channels <= 0 || st->codec->sample_rate <= 0)
return AVERROR_INVALIDDATA;
st->start_time = 0;
st->duration = AV_RL32(st->codec->extradata + 4) / st->codec->channels;
st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
return 0;
}
AVInputFormat ff_acm_demuxer = {
.name = "acm",
.long_name = NULL_IF_CONFIG_SMALL("Interplay ACM"),
.read_probe = acm_probe,
.read_header = acm_read_header,
.read_packet = ff_raw_read_partial_packet,
.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
.extensions = "acm",
.raw_codec_id = AV_CODEC_ID_INTERPLAY_ACM,
};
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