/*===========================================================================* * subsample.c * * * * Procedures concerned with subsampling * * * * EXPORTED PROCEDURES: * * LumMotionErrorA * * LumMotionErrorB * * LumMotionErrorC * * LumMotionErrorD * * * *===========================================================================*/ /* * Copyright (c) 1995 The Regents of the University of California. * All rights reserved. * * Permission to use, copy, modify, and distribute this software and its * documentation for any purpose, without fee, and without written agreement is * hereby granted, provided that the above copyright notice and the following * two paragraphs appear in all copies of this software. * * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. */ /* * $Header: /n/charlie-brown/project/mm/mpeg/mpeg_dist/mpeg_encode/RCS/subsample.c,v 1.6 1995/01/19 23:09:28 eyhung Exp $ * $Log: subsample.c,v $ * Revision 1.6 1995/01/19 23:09:28 eyhung * Changed copyrights * * Revision 1.5 1994/11/12 02:12:01 keving * nothing * * Revision 1.4 1993/12/22 19:19:01 keving * nothing * * Revision 1.4 1993/12/22 19:19:01 keving * nothing * * Revision 1.3 1993/07/22 22:23:43 keving * nothing * * Revision 1.2 1993/06/30 20:06:09 keving * nothing * * Revision 1.1 1993/06/22 21:56:05 keving * nothing * */ /*==============* * HEADER FILES * *==============*/ #include "all.h" #include "mtypes.h" #include "frames.h" #include "bitio.h" #include "prototypes.h" #undef ABS #define ABS(x) ((x < 0) ? (-x) : x) /*=====================* * EXPORTED PROCEDURES * *=====================*/ /*===========================================================================* * * LumMotionErrorA * * compute the motion error for the A subsampling pattern * * RETURNS: the error, or some number greater if it is worse * * SIDE EFFECTS: none * *===========================================================================*/ int32 LumMotionErrorA(LumBlock currentBlock, MpegFrame *prevFrame, int by, int bx, int my, int mx, int32 bestSoFar) { register int32 diff = 0; /* max value of diff is 255*256 = 65280 */ register int32 localDiff; register uint8 *macross; register uint8 **prev; register int fy, fx; boolean xHalf, yHalf; xHalf = (ABS(mx) % 2 == 1); yHalf = (ABS(my) % 2 == 1); MOTION_TO_FRAME_COORD(by, bx, my/2, mx/2, fy, fx); if ( xHalf ) { if ( mx < 0 ) { fx--; } if ( yHalf ) { if ( my < 0 ) { fy--; } prev = prevFrame->halfBoth; } else { prev = prevFrame->halfX; } } else if ( yHalf ) { if ( my < 0 ) { fy--; } prev = prevFrame->halfY; } else { prev = prevFrame->ref_y; } macross = &(prev[fy][fx]); localDiff = macross[0]-currentBlock[0][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[0][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[0][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[0][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[0][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[0][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[0][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[0][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+2][fx]); localDiff = macross[0]-currentBlock[2][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[2][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[2][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[2][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[2][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[2][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[2][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[2][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+4][fx]); localDiff = macross[0]-currentBlock[4][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[4][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[4][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[4][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[4][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[4][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[4][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[4][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+6][fx]); localDiff = macross[0]-currentBlock[6][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[6][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[6][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[6][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[6][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[6][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[6][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[6][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+8][fx]); localDiff = macross[0]-currentBlock[8][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[8][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[8][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[8][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[8][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[8][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[8][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[8][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+10][fx]); localDiff = macross[0]-currentBlock[10][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[10][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[10][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[10][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[10][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[10][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[10][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[10][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+12][fx]); localDiff = macross[0]-currentBlock[12][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[12][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[12][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[12][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[12][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[12][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[12][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[12][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+14][fx]); localDiff = macross[0]-currentBlock[14][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[14][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[14][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[14][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[14][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[14][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[14][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[14][14]; diff += ABS(localDiff); return diff; } /*===========================================================================* * * LumMotionErrorB * * compute the motion error for the B subsampling pattern * * RETURNS: the error, or some number greater if it is worse * * SIDE EFFECTS: none * *===========================================================================*/ int32 LumMotionErrorB(LumBlock currentBlock, MpegFrame *prevFrame, int by, int bx, int my, int mx, int32 bestSoFar) { register int32 diff = 0; /* max value of diff is 255*256 = 65280 */ register int32 localDiff; register uint8 *macross; register uint8 **prev; register int fy, fx; boolean xHalf, yHalf; xHalf = (ABS(mx) % 2 == 1); yHalf = (ABS(my) % 2 == 1); MOTION_TO_FRAME_COORD(by, bx, my/2, mx/2, fy, fx); if ( xHalf ) { if ( mx < 0 ) { fx--; } if ( yHalf ) { if ( my < 0 ) { fy--; } prev = prevFrame->halfBoth; } else { prev = prevFrame->halfX; } } else if ( yHalf ) { if ( my < 0 ) { fy--; } prev = prevFrame->halfY; } else { prev = prevFrame->ref_y; } macross = &(prev[fy+0][fx]); localDiff = macross[1]-currentBlock[0][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[0][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[0][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[0][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[0][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[0][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[0][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[0][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+2][fx]); localDiff = macross[1]-currentBlock[2][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[2][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[2][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[2][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[2][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[2][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[2][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[2][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+4][fx]); localDiff = macross[1]-currentBlock[4][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[4][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[4][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[4][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[4][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[4][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[4][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[4][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+6][fx]); localDiff = macross[1]-currentBlock[6][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[6][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[6][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[6][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[6][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[6][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[6][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[6][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+8][fx]); localDiff = macross[1]-currentBlock[8][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[8][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[8][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[8][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[8][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[8][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[8][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[8][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+10][fx]); localDiff = macross[1]-currentBlock[10][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[10][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[10][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[10][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[10][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[10][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[10][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[10][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+12][fx]); localDiff = macross[1]-currentBlock[12][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[12][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[12][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[12][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[12][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[12][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[12][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[12][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+14][fx]); localDiff = macross[1]-currentBlock[14][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[14][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[14][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[14][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[14][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[14][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[14][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[14][15]; diff += ABS(localDiff); return diff; } /*===========================================================================* * * LumMotionErrorC * * compute the motion error for the C subsampling pattern * * RETURNS: the error, or some number greater if it is worse * * SIDE EFFECTS: none * *===========================================================================*/ int32 LumMotionErrorC(LumBlock currentBlock, MpegFrame *prevFrame, int by, int bx, int my, int mx, int32 bestSoFar) { register int32 diff = 0; /* max value of diff is 255*256 = 65280 */ register int32 localDiff; register uint8 *macross; register uint8 **prev; register int fy, fx; boolean xHalf, yHalf; xHalf = (ABS(mx) % 2 == 1); yHalf = (ABS(my) % 2 == 1); MOTION_TO_FRAME_COORD(by, bx, my/2, mx/2, fy, fx); if ( xHalf ) { if ( mx < 0 ) { fx--; } if ( yHalf ) { if ( my < 0 ) { fy--; } prev = prevFrame->halfBoth; } else { prev = prevFrame->halfX; } } else if ( yHalf ) { if ( my < 0 ) { fy--; } prev = prevFrame->halfY; } else { prev = prevFrame->ref_y; } macross = &(prev[fy+1][fx]); localDiff = macross[0]-currentBlock[1][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[1][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[1][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[1][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[1][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[1][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[1][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[1][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+3][fx]); localDiff = macross[0]-currentBlock[3][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[3][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[3][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[3][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[3][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[3][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[3][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[3][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+5][fx]); localDiff = macross[0]-currentBlock[5][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[5][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[5][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[5][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[5][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[5][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[5][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[5][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+7][fx]); localDiff = macross[0]-currentBlock[7][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[7][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[7][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[7][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[7][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[7][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[7][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[7][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+9][fx]); localDiff = macross[0]-currentBlock[9][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[9][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[9][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[9][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[9][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[9][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[9][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[9][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+11][fx]); localDiff = macross[0]-currentBlock[11][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[11][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[11][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[11][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[11][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[11][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[11][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[11][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+13][fx]); localDiff = macross[0]-currentBlock[13][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[13][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[13][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[13][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[13][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[13][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[13][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[13][14]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+15][fx]); localDiff = macross[0]-currentBlock[15][0]; diff += ABS(localDiff); localDiff = macross[2]-currentBlock[15][2]; diff += ABS(localDiff); localDiff = macross[4]-currentBlock[15][4]; diff += ABS(localDiff); localDiff = macross[6]-currentBlock[15][6]; diff += ABS(localDiff); localDiff = macross[8]-currentBlock[15][8]; diff += ABS(localDiff); localDiff = macross[10]-currentBlock[15][10]; diff += ABS(localDiff); localDiff = macross[12]-currentBlock[15][12]; diff += ABS(localDiff); localDiff = macross[14]-currentBlock[15][14]; diff += ABS(localDiff); return diff; } /*===========================================================================* * * LumMotionErrorD * * compute the motion error for the D subsampling pattern * * RETURNS: the error, or some number greater if it is worse * * SIDE EFFECTS: none * *===========================================================================*/ int32 LumMotionErrorD(LumBlock currentBlock, MpegFrame *prevFrame, int by, int bx, int my, int mx, int32 bestSoFar) { register int32 diff = 0; /* max value of diff is 255*256 = 65280 */ register int32 localDiff; register uint8 *macross; register uint8 **prev; register int fy, fx; boolean xHalf, yHalf; xHalf = (ABS(mx) % 2 == 1); yHalf = (ABS(my) % 2 == 1); MOTION_TO_FRAME_COORD(by, bx, my/2, mx/2, fy, fx); if ( xHalf ) { if ( mx < 0 ) { fx--; } if ( yHalf ) { if ( my < 0 ) { fy--; } prev = prevFrame->halfBoth; } else { prev = prevFrame->halfX; } } else if ( yHalf ) { if ( my < 0 ) { fy--; } prev = prevFrame->halfY; } else { prev = prevFrame->ref_y; } macross = &(prev[fy+1][fx]); localDiff = macross[1]-currentBlock[1][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[1][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[1][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[1][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[1][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[1][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[1][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[1][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+3][fx]); localDiff = macross[1]-currentBlock[3][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[3][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[3][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[3][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[3][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[3][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[3][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[3][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+5][fx]); localDiff = macross[1]-currentBlock[5][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[5][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[5][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[5][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[5][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[5][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[5][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[5][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+7][fx]); localDiff = macross[1]-currentBlock[7][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[7][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[7][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[7][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[7][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[7][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[7][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[7][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+9][fx]); localDiff = macross[1]-currentBlock[9][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[9][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[9][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[9][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[9][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[9][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[9][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[9][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+11][fx]); localDiff = macross[1]-currentBlock[11][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[11][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[11][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[11][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[11][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[11][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[11][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[11][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+13][fx]); localDiff = macross[1]-currentBlock[13][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[13][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[13][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[13][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[13][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[13][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[13][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[13][15]; diff += ABS(localDiff); if ( diff > bestSoFar ) { return diff; } macross = &(prev[fy+15][fx]); localDiff = macross[1]-currentBlock[15][1]; diff += ABS(localDiff); localDiff = macross[3]-currentBlock[15][3]; diff += ABS(localDiff); localDiff = macross[5]-currentBlock[15][5]; diff += ABS(localDiff); localDiff = macross[7]-currentBlock[15][7]; diff += ABS(localDiff); localDiff = macross[9]-currentBlock[15][9]; diff += ABS(localDiff); localDiff = macross[11]-currentBlock[15][11]; diff += ABS(localDiff); localDiff = macross[13]-currentBlock[15][13]; diff += ABS(localDiff); localDiff = macross[15]-currentBlock[15][15]; diff += ABS(localDiff); return diff; }