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/*
* Cirrus Logic AccuPak (CLJR) codec
* Copyright (c) 2003 Alex Beregszaszi
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Cirrus Logic AccuPak codec.
*/
#include "avcodec.h"
#include "dsputil.h"
#include "get_bits.h"
/* Disable the encoder. */
#undef CONFIG_CLJR_ENCODER
#define CONFIG_CLJR_ENCODER 0
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,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
CLJRContext * const a = avctx->priv_data;
AVFrame *picture = data;
AVFrame * const p= (AVFrame*)&a->picture;
int x, y;
if(p->data[0])
avctx->release_buffer(avctx, p);
if(buf_size/avctx->height < avctx->width) {
av_log(avctx, AV_LOG_ERROR, "Resolution larger than buffer size. Invalid header?\n");
return -1;
}
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= AV_PICTURE_TYPE_I;
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 CONFIG_CLJR_ENCODER
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;
*p = *pict;
p->pict_type= AV_PICTURE_TYPE_I;
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 av_cold void common_init(AVCodecContext *avctx){
CLJRContext * const a = avctx->priv_data;
avcodec_get_frame_defaults(&a->picture);
avctx->coded_frame= (AVFrame*)&a->picture;
a->avctx= avctx;
}
static av_cold int decode_init(AVCodecContext *avctx){
common_init(avctx);
avctx->pix_fmt= PIX_FMT_YUV411P;
return 0;
}
#if CONFIG_CLJR_ENCODER
static av_cold int encode_init(AVCodecContext *avctx){
common_init(avctx);
return 0;
}
#endif
AVCodec ff_cljr_decoder = {
.name = "cljr",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_CLJR,
.priv_data_size = sizeof(CLJRContext),
.init = decode_init,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
};
#if CONFIG_CLJR_ENCODER
AVCodec ff_cljr_encoder = {
.name = "cljr",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_CLJR,
.priv_data_size = sizeof(CLJRContext),
.init = encode_init,
.encode = encode_frame,
.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
};
#endif
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