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libavformat
vocenc.c
Go to the documentation of this file.
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/*
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* Creative Voice File muxer.
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* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "
voc.h
"
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#include "
internal.h
"
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typedef
struct
voc_enc_context {
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int
param_written
;
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}
VocEncContext
;
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static
int
voc_write_header
(
AVFormatContext
*
s
)
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{
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AVIOContext
*pb = s->
pb
;
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AVCodecContext
*enc = s->
streams
[0]->
codec
;
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const
int
header_size = 26;
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const
int
version
= 0x0114;
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if
(s->
nb_streams
!= 1
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|| s->
streams
[0]->
codec
->
codec_type
!=
AVMEDIA_TYPE_AUDIO
)
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return
AVERROR_PATCHWELCOME
;
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if
(!enc->
codec_tag
&& enc->
codec_id
!=
AV_CODEC_ID_PCM_U8
) {
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av_log
(s,
AV_LOG_ERROR
,
"unsupported codec\n"
);
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return
AVERROR
(EINVAL);
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}
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avio_write
(pb,
ff_voc_magic
,
sizeof
(
ff_voc_magic
) - 1);
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avio_wl16
(pb, header_size);
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avio_wl16
(pb, version);
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avio_wl16
(pb, ~version + 0x1234);
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return
0;
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}
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static
int
voc_write_packet
(
AVFormatContext
*
s
,
AVPacket
*
pkt
)
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{
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VocEncContext
*voc = s->
priv_data
;
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AVCodecContext
*enc = s->
streams
[0]->
codec
;
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AVIOContext
*pb = s->
pb
;
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if
(!voc->
param_written
) {
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if
(enc->
codec_tag
> 3) {
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avio_w8
(pb,
VOC_TYPE_NEW_VOICE_DATA
);
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avio_wl24
(pb, pkt->
size
+ 12);
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avio_wl32
(pb, enc->
sample_rate
);
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avio_w8
(pb, enc->
bits_per_coded_sample
);
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avio_w8
(pb, enc->
channels
);
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avio_wl16
(pb, enc->
codec_tag
);
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avio_wl32
(pb, 0);
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}
else
{
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if
(s->
streams
[0]->
codec
->
channels
> 1) {
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avio_w8
(pb,
VOC_TYPE_EXTENDED
);
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avio_wl24
(pb, 4);
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avio_wl16
(pb, 65536-(256000000 + enc->
sample_rate
*enc->
channels
/2)/(enc->
sample_rate
*enc->
channels
));
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avio_w8
(pb, enc->
codec_tag
);
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avio_w8
(pb, enc->
channels
- 1);
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}
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avio_w8
(pb,
VOC_TYPE_VOICE_DATA
);
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avio_wl24
(pb, pkt->
size
+ 2);
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avio_w8
(pb, 256 - (1000000 + enc->
sample_rate
/2) / enc->
sample_rate
);
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avio_w8
(pb, enc->
codec_tag
);
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}
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voc->
param_written
= 1;
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}
else
{
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avio_w8
(pb,
VOC_TYPE_VOICE_DATA_CONT
);
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avio_wl24
(pb, pkt->
size
);
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}
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avio_write
(pb, pkt->
data
, pkt->
size
);
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return
0;
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}
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static
int
voc_write_trailer
(
AVFormatContext
*
s
)
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{
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avio_w8
(s->
pb
, 0);
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return
0;
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}
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AVOutputFormat
ff_voc_muxer
= {
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.
name
=
"voc"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"Creative Voice"
),
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.mime_type =
"audio/x-voc"
,
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.extensions =
"voc"
,
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.priv_data_size =
sizeof
(
VocEncContext
),
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.audio_codec =
AV_CODEC_ID_PCM_S16LE
,
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.video_codec =
AV_CODEC_ID_NONE
,
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.
write_header
=
voc_write_header
,
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.
write_packet
=
voc_write_packet
,
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.
write_trailer
=
voc_write_trailer
,
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.codec_tag = (
const
AVCodecTag
*
const
[]){
ff_voc_codec_tags
, 0 },
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};
Generated on Wed Jul 10 2013 23:48:15 for FFmpeg by
1.8.2