jpeg_vlc_test.c

基于ti c55x 序列 dsp的静止图像jpeg算法中的哈夫马编码的实现

#include <stdio.h> 
#include<imagelib.h>  

#include "test.h"  // Quantized DCT coefficents (2 Macro Blocks (YUV4:2;0) 12 blocks)
#pragma DATA_SECTION( VLC_status,"status");  
 void IMG_jpeg_vlc(int *,int *, int *,int); 
int VLC_status[80];// the memory location of VLC_status should start of a new data page

int output[64]; // JPEG baseline VLC coded bitestream. The legnth of output is 
                // data-dependent.             
 

 void main()
 {  
   
   int *ptr; 
   int blocks;
   int type; 
  
   int i, temp;
  
   for(i=0;i<64;i++) 
    output[i]=0;
    
   
    
   JPEG_vlc_init(VLC_status); // JPEG VLC variables initialization.  
   
  
   for(blocks=0;blocks<12;blocks++)
      {  
         temp=blocks%6;
         if (temp==0 | temp==1 | temp==2 | temp==3 ) type=0; 
         if (temp==4) type=1;
         if (temp==5) type=2;
         ptr=(Q_dct_coef+blocks*64);
         IMG_jpeg_vlc(ptr,output,VLC_status,type); 
      }
       
      
       // If "0xFF" add "0x00"
       
    
       
  }