test.c

TMS320VC55XX图像处理程序

#include <stdio.h>  
#include <imagelib.h>
#pragma DATA_SECTION(workingTab,"WorkTab");  

int workingTab[512]; // hold huffmantable
int input[64]; 
// Quantized 8x8 DCT coefficients of Luminance or Chrominance block.
int input_zigzag[64]; // Quantized 8x8 DCT coefficients in zigzag order.
int zig_zag[64]={ 0, 1, 5, 6,14,15,27,28, // zig_zag table
                  2, 4, 7,13,16,26,29,42,
                  3, 8,12,17,25,30,41,43,
                  9,11,18,24,31,40,44,53,
                 10,19,23,32,39,45,52,54,
                 20,22,33,38,46,51,55,60,
                 21,34,37,47,50,56,59,61,
                 35,36,48,49,57,58,62,63};

int output[64]; // JPEG baseline VLC coded bitestream. The legnth of output is 
                // data-dependent.
int type; // 0: Luminance 1: Chrominace.
 
void main()

{ 
 int i;
 type=0; // luminance
 for(i=0;i<64;i++) // input output initialization.
 {
  input[i]=0;
  output[i]=0;
  }
 
 input[0]=32; // Input setup
 input[1]=1;
 input[6]=-2;
 input[8]=-1;
 input[17]=3;
 input[18]=-4;
 input[24]=23;
 for(i=0;i<64;i++)
 input_zigzag[zig_zag[i]]=input[i];
 
 
JPEG_vlc_init(workingTab); // JPEG VLC variables initialization.
type=0; // luminance
IMG_jpeg_vlc(input_zigzag,output,type); // JPEG VLC coding for Luminance block.
// output should be
//output : 0xE808 0xFEFE 0xAFFB; 0xBFFE 0xB680
}