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libavcodec
aasc.c
Go to the documentation of this file.
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/*
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* Autodesk RLE Decoder
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* Copyright (C) 2005 the ffmpeg project
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "
avcodec.h
"
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#include "
internal.h
"
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#include "
msrledec.h
"
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typedef
struct
AascContext
{
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AVCodecContext
*
avctx
;
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GetByteContext
gb
;
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AVFrame
*
frame
;
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}
AascContext
;
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static
av_cold
int
aasc_decode_init
(
AVCodecContext
*avctx)
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{
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AascContext
*s = avctx->
priv_data
;
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s->
avctx
= avctx;
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avctx->
pix_fmt
=
AV_PIX_FMT_BGR24
;
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s->
frame
=
av_frame_alloc
();
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if
(!s->
frame
)
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return
AVERROR
(ENOMEM);
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return
0;
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}
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static
int
aasc_decode_frame
(
AVCodecContext
*avctx,
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void
*
data
,
int
*got_frame,
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AVPacket
*avpkt)
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{
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const
uint8_t
*buf = avpkt->
data
;
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int
buf_size = avpkt->
size
;
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AascContext
*s = avctx->
priv_data
;
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int
compr, i,
stride
, ret;
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if
(buf_size < 4)
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return
AVERROR_INVALIDDATA
;
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if
((ret =
ff_reget_buffer
(avctx, s->
frame
)) < 0) {
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av_log
(avctx,
AV_LOG_ERROR
,
"reget_buffer() failed\n"
);
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return
ret;
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}
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compr =
AV_RL32
(buf);
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buf += 4;
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buf_size -= 4;
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switch
(compr) {
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case
0:
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stride = (avctx->
width
* 3 + 3) & ~3;
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if
(buf_size < stride * avctx->
height
)
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return
AVERROR_INVALIDDATA
;
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for
(i = avctx->
height
- 1; i >= 0; i--) {
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memcpy(s->
frame
->
data
[0] + i * s->
frame
->
linesize
[0], buf, avctx->
width
* 3);
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buf +=
stride
;
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}
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break
;
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case
1:
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bytestream2_init
(&s->
gb
, buf, buf_size);
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ff_msrle_decode
(avctx, (
AVPicture
*)s->
frame
, 8, &s->
gb
);
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break
;
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default
:
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av_log
(avctx,
AV_LOG_ERROR
,
"Unknown compression type %d\n"
, compr);
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return
AVERROR_INVALIDDATA
;
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}
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*got_frame = 1;
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if
((ret =
av_frame_ref
(data, s->
frame
)) < 0)
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return
ret;
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/* report that the buffer was completely consumed */
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return
avpkt->
size
;
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}
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static
av_cold
int
aasc_decode_end
(
AVCodecContext
*avctx)
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{
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AascContext
*s = avctx->
priv_data
;
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av_frame_free
(&s->
frame
);
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return
0;
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}
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AVCodec
ff_aasc_decoder
= {
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.
name
=
"aasc"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"Autodesk RLE"
),
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.type =
AVMEDIA_TYPE_VIDEO
,
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.id =
AV_CODEC_ID_AASC
,
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.priv_data_size =
sizeof
(
AascContext
),
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.
init
=
aasc_decode_init
,
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.
close
=
aasc_decode_end
,
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.
decode
=
aasc_decode_frame
,
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.capabilities =
CODEC_CAP_DR1
,
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};
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