mirror of https://git.ffmpeg.org/ffmpeg.git
157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
/*
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* Cirrus Logic AccuPak (CLJR) codec
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* Copyright (c) 2003 Alex Beregszaszi
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/**
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* @file cljr.c
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* Cirrus Logic AccuPak codec.
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*/
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#include "avcodec.h"
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#include "mpegvideo.h"
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typedef struct CLJRContext{
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AVCodecContext *avctx;
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AVFrame picture;
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int delta[16];
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int offset[4];
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GetBitContext gb;
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} CLJRContext;
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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uint8_t *buf, int buf_size)
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{
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CLJRContext * const a = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame * const p= (AVFrame*)&a->picture;
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int x, y;
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if(p->data[0])
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avctx->release_buffer(avctx, p);
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p->reference= 0;
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if(avctx->get_buffer(avctx, p) < 0){
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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p->pict_type= I_TYPE;
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p->key_frame= 1;
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init_get_bits(&a->gb, buf, buf_size);
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for(y=0; y<avctx->height; y++){
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uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
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uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ];
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uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ];
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for(x=0; x<avctx->width; x+=4){
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luma[3] = get_bits(&a->gb, 5) << 3;
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luma[2] = get_bits(&a->gb, 5) << 3;
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luma[1] = get_bits(&a->gb, 5) << 3;
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luma[0] = get_bits(&a->gb, 5) << 3;
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luma+= 4;
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*(cb++) = get_bits(&a->gb, 6) << 2;
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*(cr++) = get_bits(&a->gb, 6) << 2;
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}
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}
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*picture= *(AVFrame*)&a->picture;
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*data_size = sizeof(AVPicture);
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emms_c();
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return buf_size;
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}
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#if 0
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static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
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CLJRContext * const a = avctx->priv_data;
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AVFrame *pict = data;
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AVFrame * const p= (AVFrame*)&a->picture;
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int size;
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int mb_x, mb_y;
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*p = *pict;
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p->pict_type= I_TYPE;
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p->key_frame= 1;
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emms_c();
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align_put_bits(&a->pb);
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while(get_bit_count(&a->pb)&31)
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put_bits(&a->pb, 8, 0);
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size= get_bit_count(&a->pb)/32;
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return size*4;
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}
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#endif
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static void common_init(AVCodecContext *avctx){
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CLJRContext * const a = avctx->priv_data;
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avctx->coded_frame= (AVFrame*)&a->picture;
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a->avctx= avctx;
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}
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static int decode_init(AVCodecContext *avctx){
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common_init(avctx);
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avctx->pix_fmt= PIX_FMT_YUV411P;
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return 0;
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}
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#if 0
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static int encode_init(AVCodecContext *avctx){
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common_init(avctx);
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return 0;
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}
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#endif
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AVCodec cljr_decoder = {
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"cljr",
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CODEC_TYPE_VIDEO,
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CODEC_ID_CLJR,
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sizeof(CLJRContext),
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decode_init,
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NULL,
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NULL,
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decode_frame,
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CODEC_CAP_DR1,
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};
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#if 0
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#ifdef CONFIG_ENCODERS
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AVCodec cljr_encoder = {
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"cljr",
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CODEC_TYPE_VIDEO,
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CODEC_ID_cljr,
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sizeof(CLJRContext),
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encode_init,
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encode_frame,
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//encode_end,
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};
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#endif //CONFIG_ENCODERS
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#endif
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