0,0 → 1,79 |
/* |
* AFC 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/channel_layout.h" |
#include "avformat.h" |
#include "internal.h" |
|
typedef struct AFCDemuxContext { |
int64_t data_end; |
} AFCDemuxContext; |
|
static int afc_read_header(AVFormatContext *s) |
{ |
AFCDemuxContext *c = s->priv_data; |
AVStream *st; |
|
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_ADPCM_AFC; |
st->codec->channels = 2; |
st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
|
if (ff_alloc_extradata(st->codec, 1)) |
return AVERROR(ENOMEM); |
st->codec->extradata[0] = 8 * st->codec->channels; |
|
c->data_end = avio_rb32(s->pb) + 32LL; |
st->duration = avio_rb32(s->pb); |
st->codec->sample_rate = avio_rb16(s->pb); |
avio_skip(s->pb, 22); |
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
|
return 0; |
} |
|
static int afc_read_packet(AVFormatContext *s, AVPacket *pkt) |
{ |
AFCDemuxContext *c = s->priv_data; |
int64_t size; |
int ret; |
|
size = FFMIN(c->data_end - avio_tell(s->pb), 18 * 128); |
if (size <= 0) |
return AVERROR_EOF; |
|
ret = av_get_packet(s->pb, pkt, size); |
pkt->stream_index = 0; |
return ret; |
} |
|
AVInputFormat ff_afc_demuxer = { |
.name = "afc", |
.long_name = NULL_IF_CONFIG_SMALL("AFC"), |
.priv_data_size = sizeof(AFCDemuxContext), |
.read_header = afc_read_header, |
.read_packet = afc_read_packet, |
.extensions = "afc", |
.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK, |
}; |