shuffle.c

用于TM1300/PNX1300系列DSP（主要用于视频处理）的各种滤波器源码

/*
 * Copyright (c) 2000 TriMedia Technologies Inc.
 *
 * +------------------------------------------------------------------+
 * | This software is furnished under a license and may only be used  |
 * | and copied in accordance with the terms and conditions of  such  |
 * | a license and with the inclusion of this copyright notice. This  |
 * | software or any other copies of this software may not be provided|
 * | or otherwise made available to any other person.  The ownership  |
 * | and title of this software is not transferred.                   |
 * |                                                                  |
 * | The information in this software is subject  to change without   |
 * | any  prior notice and should not be construed as a commitment by |
 * | TriMedia Technologies.                                           |
 * |                                                                  |
 * | this code and information is provided "as is" without any        |
 * | warranty of any kind, either expressed or implied, including but |
 * | not limited to the implied warranties of merchantability and/or  |
 * | fitness for any particular purpose.                              |
 * +------------------------------------------------------------------+
 *
 *  Module name              : shuffle.c    1.0
 *
 *  Last update              : 14:26:51 - 2000/04/26
 *
 *  Description              :
 *
 *  Program to convert from old to new IDCT format
 *          old format - IDCT input is transposed and shuffled
 *          new format - IDCT input is normal order
 *
 */

#include <stdlib.h>
#include <stdio.h>

void fastshuffle(short *, short *);

short	data[64] ;
short	result[64];

main(int argc, char **argv)
{
  int i, j, dataword; 

  for (i=0; i<8; i++) {
    for (j=0; j<8; j++) {
      scanf("%d", &dataword);
      data[8*i+j] = dataword ;
    }
  }

  fastshuffle(data, result);

  for (i=0; i<8; i++) {
    for (j=0; j<8; j++)
      printf("%6d ", result[8*i+j]);
    printf("\n");
  }
  exit(EXIT_SUCCESS);
}

const	int	I_j[] = {0, 2, 4, 6, 1, 3, 5, 7};
void fastshuffle(short *block, short *swap)
{
  int i, j;

	/* transpose input block with shuffling and scaling up by factor 8 */
	/* for accomodating funny Trimedia format for input of IDCT        */

	for	(j = 0; j < 8; j++)
	{
		for	(i = 0; i < 8; i++)
		{
			swap[(i << 3) | I_j[j]] = *block++ ;
		}
	}
}