block.h

AVS视频编解码器 能实现视频图像的高效率压缩 能在ＶＣ上高速运行

/*
***********************************************************************
* COPYRIGHT AND WARRANTY INFORMATION
*
* Copyright 2003, Advanced Audio Video Coding Standard, Part II
*
* DISCLAIMER OF WARRANTY
*
* These software programs are available to the users without any
* license fee or royalty on an "as is" basis. The AVS disclaims
* any and all warranties, whether express, implied, or statutory,
* including any implied warranties of merchantability or of fitness
* for a particular purpose. In no event shall the contributors or 
* the AVS be liable for any incidental, punitive, or consequential
* damages of any kind whatsoever arising from the use of this program.
*
* This disclaimer of warranty extends to the user of this program
* and user's customers, employees, agents, transferees, successors,
* and assigns.
*
* The AVS does not represent or warrant that the program furnished
* hereunder are free of infringement of any third-party patents.
* Commercial implementations of AVS, including shareware, may be
* subject to royalty fees to patent holders. Information regarding
* the AVS patent policy is available from the AVS Web site at
* http://www.avs.org.cn
*
* THIS IS NOT A GRANT OF PATENT RIGHTS - SEE THE AVS PATENT POLICY.
************************************************************************
*/

/*
*************************************************************************************
* File name: 
* Function: 
*
*************************************************************************************
*/

#include "global.h"
#include "defines.h"

#define NUM_2D_TABLES 4
#define CODE2D_ESCAPE_SYMBOL 59

// ========================================================
// external variables
// ========================================================
extern const int V[QUANT_PERIOD][6];  //!< De-Quantization table
extern const int DQMAP[4][4];          //!< Mapping the proper de-quantization value for coefficient position
extern const int N[2];                //!< Dequantization normalization
extern const int SCAN[2][64][2];      //!< Scan positions. Positions are stored as (pix,lin).
extern const char AVS_2D_VLC[NUM_2D_TABLES][16][8];  //   Inter, Intra0-13, Intra14-21, Intra22-31
extern const unsigned short int cbp_blk_masks[4];
extern char       AVS_2D_VLC_dec[NUM_2D_TABLES][64][2]; //   inverse of last table. generated automatically in read_coef_AVS()
//Lou 1014 extern const byte QP_SCALE_CR[52] ;
extern const byte QP_SCALE_CR[64] ;
extern const int AVS_VS_SCAN[64][2];
extern const int AVS_NS_SCAN[64][2];

extern char       AVS_2DVLC_INTRA_dec[7][64][2];
extern char       AVS_2DVLC_INTER_dec[7][64][2];
extern char       AVS_2DVLC_CHROMA_dec[5][64][2];
extern const char AVS_2DVLC_INTRA[7][26][27];
extern const char AVS_2DVLC_INTER[7][26][27];
extern const char AVS_2DVLC_CHROMA[5][26][27];

extern const char VLC_Golomb_Order[3][7][2];          //qwang 11.29
extern const char MaxRun[3][7];                          // added by dj
extern const char RefAbsLevel[19][26];                   // added by dj

// functions
void inv_transform_B8  (int curr_blk[B8_SIZE][B8_SIZE]);
void get_curr_blk( int block8x8,struct img_par *img, int curr_blk[B8_SIZE][B8_SIZE]);
void idct_dequant_B8(int block8x8,
                         int qp,                         // Quantization parameter
                         int curr_blk[B8_SIZE][B8_SIZE],
                         struct img_par *img
                         );
int intrapred(struct img_par *img,int img_x,int img_y);
void readLumaCoeff_B8(int block8x8, struct inp_par *inp, struct img_par *img);
void readChromaCoeff_B8(int block8x8, struct inp_par *inp, struct img_par *img);