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libavcodec
dxtory.c
Go to the documentation of this file.
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/*
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* Dxtory decoder
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*
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* Copyright (c) 2011 Konstantin Shishkov
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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 "
avcodec.h
"
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#include "
libavutil/intreadwrite.h
"
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static
av_cold
int
decode_init
(
AVCodecContext
*avctx)
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{
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avctx->
pix_fmt
=
PIX_FMT_YUV420P
;
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avctx->
coded_frame
=
avcodec_alloc_frame
();
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if
(!avctx->
coded_frame
)
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return
AVERROR
(ENOMEM);
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return
0;
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}
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static
int
decode_frame
(
AVCodecContext
*avctx,
void
*
data
,
int
*data_size,
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AVPacket
*avpkt)
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{
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int
h, w;
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AVFrame
*pic = avctx->
coded_frame
;
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const
uint8_t *src = avpkt->
data
;
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uint8_t *Y1, *Y2, *
U
, *
V
;
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int
ret;
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if
(pic->
data
[0])
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avctx->
release_buffer
(avctx, pic);
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if
(avpkt->
size
< avctx->
width
* avctx->
height
* 3 / 2 + 16) {
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av_log
(avctx,
AV_LOG_ERROR
,
"packet too small\n"
);
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return
AVERROR_INVALIDDATA
;
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}
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pic->
reference
= 0;
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if
((ret = avctx->
get_buffer
(avctx, pic)) < 0)
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return
ret;
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pic->
pict_type
=
AV_PICTURE_TYPE_I
;
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pic->
key_frame
= 1;
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if
(
AV_RL32
(src) != 0x01000002) {
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av_log_ask_for_sample
(avctx,
"Unknown frame header %X\n"
,
AV_RL32
(src));
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return
AVERROR_PATCHWELCOME
;
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}
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src += 16;
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Y1 = pic->
data
[0];
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Y2 = pic->
data
[0] + pic->
linesize
[0];
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U = pic->
data
[1];
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V = pic->
data
[2];
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for
(h = 0; h < avctx->
height
; h += 2) {
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for
(w = 0; w < avctx->
width
; w += 2) {
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AV_WN16A
(Y1 + w,
AV_RN16A
(src));
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AV_WN16A
(Y2 + w,
AV_RN16A
(src + 2));
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U[w >> 1] = src[4] + 0x80;
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V[w >> 1] = src[5] + 0x80;
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src += 6;
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}
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Y1 += pic->
linesize
[0] << 1;
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Y2 += pic->
linesize
[0] << 1;
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U += pic->
linesize
[1];
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V += pic->
linesize
[2];
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}
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*data_size =
sizeof
(
AVFrame
);
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*(
AVFrame
*)data = *pic;
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return
avpkt->
size
;
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}
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static
av_cold
int
decode_close
(
AVCodecContext
*avctx)
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{
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AVFrame
*pic = avctx->
coded_frame
;
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if
(pic->
data
[0])
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avctx->
release_buffer
(avctx, pic);
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av_freep
(&avctx->
coded_frame
);
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return
0;
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}
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AVCodec
ff_dxtory_decoder
= {
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.
name
=
"dxtory"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"Dxtory"
),
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.type =
AVMEDIA_TYPE_VIDEO
,
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.id =
CODEC_ID_DXTORY
,
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.init =
decode_init
,
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.close =
decode_close
,
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.decode =
decode_frame
,
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.capabilities =
CODEC_CAP_DR1
,
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};