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libavformat
rsoenc.c
Go to the documentation of this file.
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/*
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* RSO muxer
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* Copyright (c) 2001 Fabrice Bellard (original AU code)
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* Copyright (c) 2010 Rafael Carre
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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
9
* modify it under the terms of the GNU Lesser General Public
10
* 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 "
avformat.h
"
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#include "
internal.h
"
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#include "
riff.h
"
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#include "
rso.h
"
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static
int
rso_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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if
(!enc->
codec_tag
)
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return
AVERROR_INVALIDDATA
;
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if
(enc->
channels
!= 1) {
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av_log
(s,
AV_LOG_ERROR
,
"RSO only supports mono\n"
);
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return
AVERROR_INVALIDDATA
;
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}
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if
(!s->
pb
->
seekable
) {
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av_log
(s,
AV_LOG_ERROR
,
"muxer does not support non seekable output\n"
);
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return
AVERROR_INVALIDDATA
;
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}
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/* XXX: find legal sample rates (if any) */
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if
(enc->
sample_rate
>= 1
u
<<16) {
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av_log
(s,
AV_LOG_ERROR
,
"Sample rate must be < 65536\n"
);
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return
AVERROR_INVALIDDATA
;
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}
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if
(enc->
codec_id
==
AV_CODEC_ID_ADPCM_IMA_WAV
) {
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av_log
(s,
AV_LOG_ERROR
,
"ADPCM in RSO not implemented\n"
);
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return
AVERROR_PATCHWELCOME
;
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}
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/* format header */
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avio_wb16
(pb, enc->
codec_tag
);
/* codec ID */
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avio_wb16
(pb, 0);
/* data size, will be written at EOF */
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avio_wb16
(pb, enc->
sample_rate
);
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avio_wb16
(pb, 0x0000);
/* play mode ? (0x0000 = don't loop) */
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avio_flush
(pb);
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return
0;
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}
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static
int
rso_write_packet
(
AVFormatContext
*
s
,
AVPacket
*
pkt
)
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{
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avio_write
(s->
pb
, pkt->
data
, pkt->
size
);
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return
0;
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}
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static
int
rso_write_trailer
(
AVFormatContext
*
s
)
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{
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AVIOContext
*pb = s->
pb
;
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int64_t file_size;
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uint16_t coded_file_size;
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file_size =
avio_tell
(pb);
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if
(file_size < 0)
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return
file_size;
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if
(file_size > 0xffff +
RSO_HEADER_SIZE
) {
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av_log
(s,
AV_LOG_WARNING
,
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"Output file is too big (%"
PRId64
" bytes >= 64kB)\n"
, file_size);
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coded_file_size = 0xffff;
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}
else
{
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coded_file_size = file_size -
RSO_HEADER_SIZE
;
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}
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/* update file size */
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avio_seek
(pb, 2, SEEK_SET);
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avio_wb16
(pb, coded_file_size);
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avio_seek
(pb, file_size, SEEK_SET);
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return
0;
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}
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AVOutputFormat
ff_rso_muxer
= {
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.
name
=
"rso"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"Lego Mindstorms RSO"
),
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.extensions =
"rso"
,
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.audio_codec =
AV_CODEC_ID_PCM_U8
,
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.video_codec =
AV_CODEC_ID_NONE
,
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.write_header =
rso_write_header
,
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.write_packet =
rso_write_packet
,
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.write_trailer =
rso_write_trailer
,
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.codec_tag = (
const
AVCodecTag
*
const
[]){
ff_codec_rso_tags
, 0},
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};
Generated on Wed Jul 10 2013 23:48:14 for FFmpeg by
1.8.2