vcr1.c
资源名称:tcpmp.rar [点击查看]
上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:5k
源码类别:
Windows CE
开发平台:
C/C++
- /*
- * ATI VCR1 codec
- * Copyright (c) 2003 Michael Niedermayer
- *
- * 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 vcr1.c
- * ati vcr1 codec.
- */
- #include "avcodec.h"
- #include "mpegvideo.h"
- //#undef NDEBUG
- //#include <assert.h>
- typedef struct VCR1Context{
- AVCodecContext *avctx;
- AVFrame picture;
- int delta[16];
- int offset[4];
- } VCR1Context;
- static int decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
- {
- VCR1Context * const a = avctx->priv_data;
- AVFrame *picture = data;
- AVFrame * const p= (AVFrame*)&a->picture;
- uint8_t *bytestream= buf;
- int i, x, y;
- 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() failedn");
- return -1;
- }
- p->pict_type= I_TYPE;
- p->key_frame= 1;
- for(i=0; i<16; i++){
- a->delta[i]= *(bytestream++);
- bytestream++;
- }
- for(y=0; y<avctx->height; y++){
- int offset;
- uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ];
- if((y&3) == 0){
- uint8_t *cb= &a->picture.data[1][ (y>>2)*a->picture.linesize[1] ];
- uint8_t *cr= &a->picture.data[2][ (y>>2)*a->picture.linesize[2] ];
- for(i=0; i<4; i++)
- a->offset[i]= *(bytestream++);
- offset= a->offset[0] - a->delta[ bytestream[2]&0xF ];
- for(x=0; x<avctx->width; x+=4){
- luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
- luma[1]=( offset += a->delta[ bytestream[2]>>4 ]);
- luma[2]=( offset += a->delta[ bytestream[0]&0xF ]);
- luma[3]=( offset += a->delta[ bytestream[0]>>4 ]);
- luma += 4;
- *(cb++) = bytestream[3];
- *(cr++) = bytestream[1];
- bytestream+= 4;
- }
- }else{
- offset= a->offset[y&3] - a->delta[ bytestream[2]&0xF ];
- for(x=0; x<avctx->width; x+=8){
- luma[0]=( offset += a->delta[ bytestream[2]&0xF ]);
- luma[1]=( offset += a->delta[ bytestream[2]>>4 ]);
- luma[2]=( offset += a->delta[ bytestream[3]&0xF ]);
- luma[3]=( offset += a->delta[ bytestream[3]>>4 ]);
- luma[4]=( offset += a->delta[ bytestream[0]&0xF ]);
- luma[5]=( offset += a->delta[ bytestream[0]>>4 ]);
- luma[6]=( offset += a->delta[ bytestream[1]&0xF ]);
- luma[7]=( offset += a->delta[ bytestream[1]>>4 ]);
- luma += 8;
- bytestream+= 4;
- }
- }
- }
- *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){
- VCR1Context * 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){
- VCR1Context * 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_YUV410P;
- return 0;
- }
- #if 0
- static int encode_init(AVCodecContext *avctx){
- common_init(avctx);
- return 0;
- }
- #endif
- AVCodec vcr1_decoder = {
- "vcr1",
- CODEC_TYPE_VIDEO,
- CODEC_ID_VCR1,
- sizeof(VCR1Context),
- decode_init,
- NULL,
- NULL,
- decode_frame,
- CODEC_CAP_DR1,
- };
- #if 0
- #ifdef CONFIG_ENCODERS
- AVCodec vcr1_encoder = {
- "vcr1",
- CODEC_TYPE_VIDEO,
- CODEC_ID_VCR1,
- sizeof(VCR1Context),
- encode_init,
- encode_frame,
- //encode_end,
- };
- #endif //CONFIG_ENCODERS
- #endif