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libavformat
eacdata.c
Go to the documentation of this file.
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/*
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* Electronic Arts .cdata file Demuxer
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* Copyright (c) 2007 Peter Ross
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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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#include "
avformat.h
"
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#include "
internal.h
"
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typedef
struct
{
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unsigned
int
channels
;
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unsigned
int
audio_pts
;
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}
CdataDemuxContext
;
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static
int
cdata_probe
(
AVProbeData
*p)
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{
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const
uint8_t *
b
= p->
buf
;
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if
(b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C))
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return
AVPROBE_SCORE_MAX
/8;
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return
0;
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}
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static
int
cdata_read_header
(
AVFormatContext
*s,
AVFormatParameters
*ap)
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{
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CdataDemuxContext
*cdata = s->
priv_data
;
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AVIOContext
*pb = s->
pb
;
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unsigned
int
sample_rate, header;
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AVStream
*st;
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header =
avio_rb16
(pb);
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switch
(header) {
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case
0x0400: cdata->
channels
= 1;
break
;
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case
0x0404: cdata->
channels
= 2;
break
;
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case
0x040C: cdata->
channels
= 4;
break
;
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default
:
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av_log
(s,
AV_LOG_INFO
,
"unknown header 0x%04x\n"
, header);
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return
-1;
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};
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sample_rate =
avio_rb16
(pb);
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avio_skip
(pb, 12);
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st =
avformat_new_stream
(s,
NULL
);
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if
(!st)
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return
AVERROR
(ENOMEM);
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st->
codec
->
codec_type
=
AVMEDIA_TYPE_AUDIO
;
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st->
codec
->
codec_tag
= 0;
/* no fourcc */
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st->
codec
->
codec_id
=
CODEC_ID_ADPCM_EA_XAS
;
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st->
codec
->
channels
= cdata->
channels
;
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st->
codec
->
sample_rate
= sample_rate;
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avpriv_set_pts_info
(st, 64, 1, sample_rate);
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cdata->
audio_pts
= 0;
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return
0;
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}
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static
int
cdata_read_packet
(
AVFormatContext
*s,
AVPacket
*pkt)
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{
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CdataDemuxContext
*cdata = s->
priv_data
;
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int
packet_size = 76*cdata->
channels
;
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int
ret =
av_get_packet
(s->
pb
, pkt, packet_size);
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if
(ret < 0)
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return
ret;
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pkt->
pts
= cdata->
audio_pts
++;
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return
0;
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}
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AVInputFormat
ff_ea_cdata_demuxer
= {
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.
name
=
"ea_cdata"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"Electronic Arts cdata"
),
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.priv_data_size =
sizeof
(
CdataDemuxContext
),
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.
read_probe
=
cdata_probe
,
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.
read_header
=
cdata_read_header
,
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.
read_packet
=
cdata_read_packet
,
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.extensions =
"cdata"
,
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};