mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.4 KiB
75 lines
2.4 KiB
/* |
|
* 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(const 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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
|
st->codecpar->codec_id = AV_CODEC_ID_INTERPLAY_ACM; |
|
|
|
ret = ff_get_extradata(s, st->codecpar, s->pb, 14); |
|
if (ret < 0) |
|
return ret; |
|
|
|
st->codecpar->channels = AV_RL16(st->codecpar->extradata + 8); |
|
st->codecpar->sample_rate = AV_RL16(st->codecpar->extradata + 10); |
|
if (st->codecpar->channels <= 0 || st->codecpar->sample_rate <= 0) |
|
return AVERROR_INVALIDDATA; |
|
st->start_time = 0; |
|
st->duration = AV_RL32(st->codecpar->extradata + 4) / st->codecpar->channels; |
|
st->need_parsing = AVSTREAM_PARSE_FULL_RAW; |
|
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
|
|
|
return 0; |
|
} |
|
|
|
FF_RAW_DEMUXER_CLASS(acm) |
|
const 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, |
|
.priv_data_size = sizeof(FFRawDemuxerContext), |
|
.priv_class = &acm_demuxer_class, |
|
};
|
|
|