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libavformat
frmdec.c
Go to the documentation of this file.
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/*
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* Megalux Frame demuxer
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* Copyright (c) 2010 Peter Ross <pross@xvid.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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/**
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* @file
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* Megalux Frame demuxer
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*/
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#include "
libavcodec/raw.h
"
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#include "
libavutil/intreadwrite.h
"
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#include "
avformat.h
"
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static
const
PixelFormatTag
frm_pix_fmt_tags
[] = {
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{
AV_PIX_FMT_RGB555
, 1 },
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{
AV_PIX_FMT_RGB0
, 2 },
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{
AV_PIX_FMT_RGB24
, 3 },
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{
AV_PIX_FMT_BGR0
, 4 },
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{
AV_PIX_FMT_BGRA
, 5 },
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{
AV_PIX_FMT_NONE
, 0 },
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};
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typedef
struct
{
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int
count
;
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}
FrmContext
;
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static
int
frm_read_probe
(
AVProbeData
*p)
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{
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if
(p->
buf_size
> 8 &&
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p->
buf
[0] ==
'F'
&& p->
buf
[1] ==
'R'
&& p->
buf
[2] ==
'M'
&&
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AV_RL16
(&p->
buf
[4]) &&
AV_RL16
(&p->
buf
[6]))
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return
AVPROBE_SCORE_MAX
/ 4;
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return
0;
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}
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static
int
frm_read_header
(
AVFormatContext
*avctx)
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{
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AVIOContext
*pb = avctx->
pb
;
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AVStream
*st =
avformat_new_stream
(avctx, 0);
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if
(!st)
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return
AVERROR
(ENOMEM);
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st->
codec
->
codec_type
=
AVMEDIA_TYPE_VIDEO
;
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st->
codec
->
codec_id
=
AV_CODEC_ID_RAWVIDEO
;
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avio_skip
(pb, 3);
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st->
codec
->
pix_fmt
=
avpriv_find_pix_fmt
(frm_pix_fmt_tags,
avio_r8
(pb));
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if
(!st->
codec
->
pix_fmt
)
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return
AVERROR_INVALIDDATA
;
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st->
codec
->
codec_tag
= 0;
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st->
codec
->
width
=
avio_rl16
(pb);
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st->
codec
->
height
=
avio_rl16
(pb);
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return
0;
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}
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static
int
frm_read_packet
(
AVFormatContext
*avctx,
AVPacket
*
pkt
)
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{
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FrmContext
*
s
= avctx->
priv_data
;
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AVCodecContext
*stc = avctx->
streams
[0]->
codec
;
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int
packet_size,
ret
;
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if
(s->
count
)
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return
AVERROR_EOF
;
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packet_size =
avpicture_get_size
(stc->
pix_fmt
, stc->
width
, stc->
height
);
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if
(packet_size < 0)
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return
AVERROR_INVALIDDATA
;
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ret =
av_get_packet
(avctx->
pb
, pkt, packet_size);
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if
(ret < 0)
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return
ret
;
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if
(stc->
pix_fmt
==
AV_PIX_FMT_BGRA
) {
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int
i;
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for
(i = 3; i + 1 <= pkt->
size
; i += 4)
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pkt->
data
[i] = 0xFF - pkt->
data
[i];
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}
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pkt->
stream_index
= 0;
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s->
count
++;
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return
0;
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}
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AVInputFormat
ff_frm_demuxer
= {
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.
name
=
"frm"
,
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.priv_data_size =
sizeof
(
FrmContext
),
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.long_name =
NULL_IF_CONFIG_SMALL
(
"Megalux Frame"
),
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.read_probe =
frm_read_probe
,
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.read_header =
frm_read_header
,
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.read_packet =
frm_read_packet
,
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};
Generated on Sun Mar 23 2014 23:50:10 for FFmpeg by
1.8.2