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libavcodec
y41pdec.c
Go to the documentation of this file.
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/*
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* y41p decoder
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*
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* Copyright (c) 2012 Paul B Mahol
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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 "
avcodec.h
"
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#include "
internal.h
"
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static
av_cold
int
y41p_decode_init
(
AVCodecContext
*avctx)
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{
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avctx->
pix_fmt
=
AV_PIX_FMT_YUV411P
;
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avctx->
bits_per_raw_sample
= 12;
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if
(avctx->
width
& 7) {
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av_log
(avctx,
AV_LOG_WARNING
,
"y41p requires width to be divisible by 8.\n"
);
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}
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return
0;
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}
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static
int
y41p_decode_frame
(
AVCodecContext
*avctx,
void
*
data
,
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int
*got_frame,
AVPacket
*avpkt)
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{
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AVFrame
*pic =
data
;
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uint8_t
*
src
= avpkt->
data
;
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uint8_t
*
y
, *
u
, *
v
;
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int
i, j,
ret
;
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if
(avpkt->
size
< 1.5 * avctx->
height
* avctx->
width
) {
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av_log
(avctx,
AV_LOG_ERROR
,
"Insufficient input data.\n"
);
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return
AVERROR
(EINVAL);
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}
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if
((ret =
ff_get_buffer
(avctx, pic, 0)) < 0)
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return
ret
;
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pic->
key_frame
= 1;
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pic->
pict_type
=
AV_PICTURE_TYPE_I
;
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for
(i = avctx->
height
- 1; i >= 0 ; i--) {
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y = &pic->
data
[0][i * pic->
linesize
[0]];
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u = &pic->
data
[1][i * pic->
linesize
[1]];
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v = &pic->
data
[2][i * pic->
linesize
[2]];
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for
(j = 0; j < avctx->
width
; j += 8) {
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*(u++) = *src++;
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*(y++) = *src++;
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*(v++) = *src++;
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*(y++) = *src++;
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*(u++) = *src++;
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*(y++) = *src++;
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*(v++) = *src++;
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*(y++) = *src++;
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*(y++) = *src++;
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*(y++) = *src++;
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*(y++) = *src++;
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*(y++) = *src++;
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}
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}
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*got_frame = 1;
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return
avpkt->
size
;
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}
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AVCodec
ff_y41p_decoder
= {
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.
name
=
"y41p"
,
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.type =
AVMEDIA_TYPE_VIDEO
,
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.id =
AV_CODEC_ID_Y41P
,
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.init =
y41p_decode_init
,
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.decode =
y41p_decode_frame
,
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.capabilities =
CODEC_CAP_DR1
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"Uncompressed YUV 4:1:1 12-bit"
),
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};
Generated on Wed Jul 10 2013 23:48:08 for FFmpeg by
1.8.2