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/*===========================================================================*
* 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 FILES *
*==============*/
#include "pm_c_util.h"
#include "all.h"
#include "mtypes.h"
#include "frames.h"
#include "bitio.h"
#include "prototypes.h"
#include "subsample.h"
static void
computePrevFyFx(MpegFrame * const prevFrame,
int const by,
int const bx,
vector const m,
uint8 *** const prevP,
int * const fyP,
int * const fxP) {
boolean const xHalf = (ABS(m.x) % 2 == 1);
boolean const yHalf = (ABS(m.y) % 2 == 1);
MotionToFrameCoord(by, bx, m.y/2, m.x/2, fyP, fxP);
if (xHalf) {
if (m.x < 0)
--*fxP;
if (yHalf) {
if (m.y < 0)
--*fyP;
*prevP = prevFrame->halfBoth;
} else
*prevP = prevFrame->halfX;
} else if (yHalf) {
if (m.y < 0)
--*fyP;
*prevP = prevFrame->halfY;
} else
*prevP = prevFrame->ref_y;
}
static int32
evenColDiff(const uint8 * const macross,
const int32 * const currentRow) {
return 0
+ ABS(macross[ 0] - currentRow[ 0])
+ ABS(macross[ 2] - currentRow[ 2])
+ ABS(macross[ 4] - currentRow[ 4])
+ ABS(macross[ 6] - currentRow[ 6])
+ ABS(macross[ 8] - currentRow[ 8])
+ ABS(macross[10] - currentRow[10])
+ ABS(macross[12] - currentRow[12])
+ ABS(macross[14] - currentRow[14]);
}
static int32
oddColDiff(const uint8 * const macross,
const int32 * const currentRow) {
return 0
+ ABS(macross[ 1] - currentRow[ 1])
+ ABS(macross[ 3] - currentRow[ 3])
+ ABS(macross[ 5] - currentRow[ 5])
+ ABS(macross[ 7] - currentRow[ 7])
+ ABS(macross[ 9] - currentRow[ 9])
+ ABS(macross[11] - currentRow[11])
+ ABS(macross[13] - currentRow[13])
+ ABS(macross[15] - currentRow[15]);
}
/*===========================================================================*
*
* 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(const LumBlock * const currentBlockP,
MpegFrame * const prevFrame,
int const by,
int const bx,
vector const m,
int32 const bestSoFar) {
int32 diff; /* max value of diff is 255*256 = 65280 */
uint8 ** prev;
int fy, fx;
unsigned int rowNumber;
computePrevFyFx(prevFrame, by, bx, m, &prev, &fy, &fx);
diff = 0; /* initial value */
for (rowNumber = 0; rowNumber < 16; rowNumber +=2) {
uint8 * const macross = &(prev[fy + rowNumber][fx]);
const int32 * const currentRow = currentBlockP->l[rowNumber];
diff += evenColDiff(macross, currentRow);
if (diff > bestSoFar)
return diff;
}
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(const LumBlock * const currentBlockP,
MpegFrame * const prevFrame,
int const by,
int const bx,
vector const m,
int32 const bestSoFar) {
int32 diff; /* max value of diff is 255*256 = 65280 */
uint8 **prev;
int fy, fx;
unsigned int rowNumber;
computePrevFyFx(prevFrame, by, bx, m, &prev, &fy, &fx);
diff = 0; /* initial value */
for (rowNumber = 0; rowNumber < 16; rowNumber +=2) {
uint8 * const macross = &(prev[fy + rowNumber][fx]);
const int32 * const currentRow = currentBlockP->l[rowNumber];
diff += oddColDiff(macross, currentRow);
if (diff > bestSoFar)
return diff;
}
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(const LumBlock * const currentBlockP,
MpegFrame * const prevFrame,
int const by,
int const bx,
vector const m,
int32 const bestSoFar) {
int32 diff; /* max value of diff is 255*256 = 65280 */
uint8 **prev;
int fy, fx;
unsigned int rowNumber;
computePrevFyFx(prevFrame, by, bx, m, &prev, &fy, &fx);
diff = 0; /* initial value */
for (rowNumber = 1; rowNumber < 16; rowNumber +=2) {
uint8 * const macross = &(prev[fy + rowNumber][fx]);
const int32 * const currentRow = currentBlockP->l[rowNumber];
diff += evenColDiff(macross, currentRow);
if (diff > bestSoFar)
return diff;
}
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(const LumBlock * const currentBlockP,
MpegFrame * const prevFrame,
int const by,
int const bx,
vector const m,
int32 const bestSoFar) {
int32 diff; /* max value of diff is 255*256 = 65280 */
uint8 ** prev;
int fy, fx;
unsigned int rowNumber;
computePrevFyFx(prevFrame, by, bx, m, &prev, &fy, &fx);
diff = 0; /* initial value */
for (rowNumber = 1; rowNumber < 16; rowNumber +=2) {
uint8 * const macross = &(prev[fy + rowNumber][fx]);
const int32 * const currentRow = currentBlockP->l[rowNumber];
diff += oddColDiff(macross, currentRow);
if (diff > bestSoFar)
return diff;
}
return diff;
}
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