160 lines
3.7 KiB
C
160 lines
3.7 KiB
C
/*
|
|
* Cirrus Logic AccuPak (CLJR) codec
|
|
* Copyright (c) 2003 Alex Beregszaszi
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* @file cljr.c
|
|
* Cirrus Logic AccuPak codec.
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "mpegvideo.h"
|
|
|
|
typedef struct CLJRContext{
|
|
AVCodecContext *avctx;
|
|
AVFrame picture;
|
|
int delta[16];
|
|
int offset[4];
|
|
GetBitContext gb;
|
|
} CLJRContext;
|
|
|
|
static int decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
CLJRContext * const a = avctx->priv_data;
|
|
AVFrame *picture = data;
|
|
AVFrame * const p= (AVFrame*)&a->picture;
|
|
int x, y;
|
|
|
|
/* special case for last picture */
|
|
if (buf_size == 0) {
|
|
return 0;
|
|
}
|
|
|
|
if(p->data[0])
|
|
avctx->release_buffer(avctx, p);
|
|
|
|
p->reference= 0;
|
|
if(avctx->get_buffer(avctx, p) < 0){
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
p->pict_type= I_TYPE;
|
|
p->key_frame= 1;
|
|
|
|
init_get_bits(&a->gb, buf, buf_size);
|
|
|
|
for(y=0; y<avctx->height; y++){
|
|
uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
|
|
uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
|
|
uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
|
|
for(x=0; x<avctx->width; x+=4){
|
|
luma[3] = get_bits(&a->gb, 5) << 3;
|
|
luma[2] = get_bits(&a->gb, 5) << 3;
|
|
luma[1] = get_bits(&a->gb, 5) << 3;
|
|
luma[0] = get_bits(&a->gb, 5) << 3;
|
|
luma+= 4;
|
|
*(cb++) = get_bits(&a->gb, 6) << 2;
|
|
*(cr++) = get_bits(&a->gb, 6) << 2;
|
|
}
|
|
}
|
|
|
|
*picture= *(AVFrame*)&a->picture;
|
|
*data_size = sizeof(AVPicture);
|
|
|
|
emms_c();
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
#if 0
|
|
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
|
|
CLJRContext * const a = avctx->priv_data;
|
|
AVFrame *pict = data;
|
|
AVFrame * const p= (AVFrame*)&a->picture;
|
|
int size;
|
|
int mb_x, mb_y;
|
|
|
|
*p = *pict;
|
|
p->pict_type= I_TYPE;
|
|
p->key_frame= 1;
|
|
|
|
emms_c();
|
|
|
|
align_put_bits(&a->pb);
|
|
while(get_bit_count(&a->pb)&31)
|
|
put_bits(&a->pb, 8, 0);
|
|
|
|
size= get_bit_count(&a->pb)/32;
|
|
|
|
return size*4;
|
|
}
|
|
#endif
|
|
|
|
static void common_init(AVCodecContext *avctx){
|
|
CLJRContext * const a = avctx->priv_data;
|
|
|
|
avctx->coded_frame= (AVFrame*)&a->picture;
|
|
a->avctx= avctx;
|
|
}
|
|
|
|
static int decode_init(AVCodecContext *avctx){
|
|
|
|
common_init(avctx);
|
|
|
|
avctx->pix_fmt= PIX_FMT_YUV411P;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int encode_init(AVCodecContext *avctx){
|
|
|
|
common_init(avctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec cljr_decoder = {
|
|
"cljr",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_CLJR,
|
|
sizeof(CLJRContext),
|
|
decode_init,
|
|
NULL,
|
|
NULL,
|
|
decode_frame,
|
|
CODEC_CAP_DR1,
|
|
};
|
|
#if 0
|
|
#ifdef CONFIG_ENCODERS
|
|
|
|
AVCodec cljr_encoder = {
|
|
"cljr",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_cljr,
|
|
sizeof(CLJRContext),
|
|
encode_init,
|
|
encode_frame,
|
|
//encode_end,
|
|
};
|
|
|
|
#endif //CONFIG_ENCODERS
|
|
#endif
|