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libavformat
adxdec.c
Go to the documentation of this file.
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/*
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* Copyright (c) 2011 Justin Ruggles
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* CRI ADX demuxer
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*/
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#include "
libavutil/intreadwrite.h
"
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#include "
libavcodec/adx.h
"
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#include "
avformat.h
"
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#include "
internal.h
"
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#define BLOCK_SIZE 18
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#define BLOCK_SAMPLES 32
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typedef
struct
ADXDemuxerContext
{
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int
header_size
;
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}
ADXDemuxerContext
;
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static
int
adx_read_packet
(
AVFormatContext
*s,
AVPacket
*
pkt
)
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{
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ADXDemuxerContext
*
c
= s->
priv_data
;
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AVCodecContext
*avctx = s->
streams
[0]->
codec
;
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int
ret,
size
;
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size =
BLOCK_SIZE
* avctx->
channels
;
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pkt->
pos
=
avio_tell
(s->
pb
);
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pkt->
stream_index
= 0;
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ret =
av_get_packet
(s->
pb
, pkt, size);
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if
(ret != size) {
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av_free_packet
(pkt);
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return
ret < 0 ? ret :
AVERROR
(EIO);
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}
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if
(
AV_RB16
(pkt->
data
) & 0x8000) {
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av_free_packet
(pkt);
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return
AVERROR_EOF
;
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}
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pkt->
size
=
size
;
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pkt->
duration
= 1;
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pkt->
pts
= (pkt->
pos
- c->
header_size
) / size;
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return
0;
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}
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static
int
adx_read_header
(
AVFormatContext
*s)
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{
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ADXDemuxerContext
*
c
= s->
priv_data
;
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AVCodecContext
*avctx;
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int
ret;
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AVStream
*st =
avformat_new_stream
(s,
NULL
);
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if
(!st)
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return
AVERROR
(ENOMEM);
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avctx = s->
streams
[0]->
codec
;
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if
(
avio_rb16
(s->
pb
) != 0x8000)
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return
AVERROR_INVALIDDATA
;
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c->
header_size
=
avio_rb16
(s->
pb
) + 4;
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avio_seek
(s->
pb
, -4, SEEK_CUR);
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avctx->
extradata
=
av_mallocz
(c->
header_size
+
FF_INPUT_BUFFER_PADDING_SIZE
);
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if
(!avctx->
extradata
)
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return
AVERROR
(ENOMEM);
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if
(
avio_read
(s->
pb
, avctx->
extradata
, c->
header_size
) < c->
header_size
) {
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av_freep
(&avctx->
extradata
);
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return
AVERROR
(EIO);
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}
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avctx->
extradata_size
= c->
header_size
;
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ret =
avpriv_adx_decode_header
(avctx, avctx->
extradata
,
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avctx->
extradata_size
, &c->
header_size
,
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NULL
);
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if
(ret)
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return
ret;
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st->
codec
->
codec_type
=
AVMEDIA_TYPE_AUDIO
;
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st->
codec
->
codec_id
= s->
iformat
->
raw_codec_id
;
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avpriv_set_pts_info
(st, 64,
BLOCK_SAMPLES
, avctx->
sample_rate
);
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return
0;
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}
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AVInputFormat
ff_adx_demuxer
= {
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.
name
=
"adx"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"CRI ADX"
),
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.priv_data_size =
sizeof
(
ADXDemuxerContext
),
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.
read_header
=
adx_read_header
,
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.
read_packet
=
adx_read_packet
,
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.extensions =
"adx"
,
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.raw_codec_id =
AV_CODEC_ID_ADPCM_ADX
,
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.
flags
=
AVFMT_GENERIC_INDEX
,
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};
Generated on Sat May 25 2013 03:58:31 for FFmpeg by
1.8.2