tr8x8invdct.c

IDCT 反离散余弦变换原程序

/****************************************************************************
Copyright (c) 2000 Analog Devices Inc. All rights reserved.
*****************************************************************************
  
File name: tr8x8invdct.c

Description : This is the test file for the testing of functionality of
              of Inverse 8x8 DCT.

Date : 9th Oct. 2000.
***************************************************************************/

#include <stdio.h>
#include "tr8x8invdct.h"

#define PI 3.14159265358979
#define PRINT_ON_ERROR

void main (void)
{
int n, i, j, error, error_flag = 0;
fract16 in[64], temp[64];  //8x8

n = 8;

//Test case when all the input values are set to zero.

printf("Testing property 1.......\n");

for(i=0; i<64; i++)
  in[i] = 0;

_r8x8invdct(in, coef, temp);

for (i = 0; i < 64; i++)
	{
	if (in[i] != 0)
		{	 
			error_flag = 1; 
			printf("Failed\n\n");
#ifdef PRINT_ON_ERROR
	 printf("Expected Result : Output[%d] = 0x%4.4x \n", i, 0x0000);
	 printf("Calculated Result : Output[%d] = 0x%4.4x \n", i, in[i]);
#endif
		}
	}

//Test case when there is an impulse value of 255.

printf("Testing property 2.......\n");

for(i=0; i<64; i++)
  in[i] = Testcase2_In[i];

_r8x8invdct(in, coef, temp);

for (i = 0; i < 64; i++)
	{
	error = in[i] - Testcase2_out[i];
	if (abs(error) > 6)
		{	 
			error_flag = 1; 
			printf("Failed\n\n");
#ifdef PRINT_ON_ERROR
	 printf("Expected Result : Output[%d] = 0x%4.4x \n", i, Testcase2_out[i]);
	 printf("Calculated Result : Output[%d] = 0x%4.4x \n", i, in[i]);
#endif
		}
	}

//Test case when all the input value are set to 25 (DC).

printf("Testing property 3.......\n");

for(i=0; i<64; i++)
  in[i] = Testcase3_In[i];

_r8x8invdct(in, coef, temp);

for (i = 0; i < 64; i++)
	{
	error = in[i] - Testcase3_out[i];
	if (abs(error) > 1)
		{	 
			error_flag = 1; 
			printf("Failed\n\n");
#ifdef PRINT_ON_ERROR
	 printf("Expected Result : Output[%d] = 0x%4.4x \n", i, Testcase3_out[i]);
	 printf("Calculated Result : Output[%d] = 0x%4.4x \n", i, in[i]);
#endif
		}
	}

//Test when the input is multifrequency.

printf("Testing property 4.......\n");

for(i=0; i<64; i++)
  in[i] = Testcase4_In[i];

_r8x8invdct(in, coef, temp);

for (i = 0; i < 64; i++)
	{
	error = in[i] - Testcase4_out[i];
	if (abs(error) > 3)
		{	 
			error_flag = 1; 
			printf("Failed\n\n");
#ifdef PRINT_ON_ERROR
	 printf("Expected Result : Output[%d] = 0x%4.4x \n", i, Testcase4_out[i]);
	 printf("Calculated Result : Output[%d] = 0x%4.4x \n", i, in[i]);
#endif
		}
	}
}