3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/channel_layout.h"
26 typedef struct AFCDemuxContext
{
30 static int afc_read_header(AVFormatContext
*s
)
32 AFCDemuxContext
*c
= s
->priv_data
;
35 st
= avformat_new_stream(s
, NULL
);
37 return AVERROR(ENOMEM
);
38 st
->codec
->codec_type
= AVMEDIA_TYPE_AUDIO
;
39 st
->codec
->codec_id
= AV_CODEC_ID_ADPCM_AFC
;
40 st
->codec
->channels
= 2;
41 st
->codec
->channel_layout
= AV_CH_LAYOUT_STEREO
;
43 if (ff_alloc_extradata(st
->codec
, 1))
44 return AVERROR(ENOMEM
);
45 st
->codec
->extradata
[0] = 8 * st
->codec
->channels
;
47 c
->data_end
= avio_rb32(s
->pb
) + 32LL;
48 st
->duration
= avio_rb32(s
->pb
);
49 st
->codec
->sample_rate
= avio_rb16(s
->pb
);
51 avpriv_set_pts_info(st
, 64, 1, st
->codec
->sample_rate
);
56 static int afc_read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
58 AFCDemuxContext
*c
= s
->priv_data
;
62 size
= FFMIN(c
->data_end
- avio_tell(s
->pb
), 18 * 128);
66 ret
= av_get_packet(s
->pb
, pkt
, size
);
67 pkt
->stream_index
= 0;
71 AVInputFormat ff_afc_demuxer
= {
73 .long_name
= NULL_IF_CONFIG_SMALL("AFC"),
74 .priv_data_size
= sizeof(AFCDemuxContext
),
75 .read_header
= afc_read_header
,
76 .read_packet
= afc_read_packet
,
78 .flags
= AVFMT_NOBINSEARCH
| AVFMT_NOGENSEARCH
| AVFMT_NO_BYTE_SEEK
,