ref: cf5a112b491684aacc8cf1a78e44cf25ebd150ec
dir: /codec/processing/src/scrolldetection/ScrollDetectionFuncs.cpp/
/*!
* \copy
* Copyright (c) 2009-2013, Cisco Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "ScrollDetection.h"
#include "ScrollDetectionFuncs.h"
#include "ls_defines.h"
WELSVP_NAMESPACE_BEGIN
int32_t CheckLine (uint8_t* pData, int32_t iWidth) {
int32_t iQualified = 0;
int32_t iColorMap[8] = {0};
int32_t iChangedTimes = 0;
int32_t iColorCounts = 0;
RECORD_COLOR (pData[0], iColorMap);
for (int32_t i = 1; i < iWidth; i++) {
RECORD_COLOR (pData[i], iColorMap);
iChangedTimes += (pData[i] != pData[i - 1]);
}
for (int32_t i = 0; i < 8; i++)
for (int32_t j = 0; j < 32; j++)
iColorCounts += ((iColorMap[i] >> j) & 1);
switch (iColorCounts) {
case 1:
iQualified = 0;
break;
case 2:
case 3:
iQualified = (iChangedTimes > 3);
break;
default:
iQualified = 1;
break;
}
return iQualified;
}
int32_t SelectTestLine (uint8_t* pY, int32_t iWidth, int32_t iHeight, int32_t iPicHeight,
int32_t iStride, int32_t iOffsetX, int32_t iOffsetY) {
const int32_t kiHalfHeight = iHeight >> 1;
const int32_t kiMidPos = iOffsetY + kiHalfHeight;
int32_t TestPos = kiMidPos;
int32_t iOffsetAbs;
uint8_t* pTmp;
for (iOffsetAbs = 0; iOffsetAbs < kiHalfHeight; iOffsetAbs++) {
TestPos = kiMidPos + iOffsetAbs;
if (TestPos < iPicHeight) {
pTmp = pY + TestPos * iStride + iOffsetX;
if (CheckLine (pTmp, iWidth)) break;
}
TestPos = kiMidPos - iOffsetAbs;
if (TestPos >= 0) {
pTmp = pY + TestPos * iStride + iOffsetX;
if (CheckLine (pTmp, iWidth)) break;
}
}
if (iOffsetAbs == kiHalfHeight)
TestPos = -1;
return TestPos;
}
/*
* compare pixel line between previous and current one
* return: 0 for totally equal, otherwise 1
*/
int32_t CompareLine (uint8_t* pYSrc, uint8_t* pYRef, const int32_t kiWidth) {
int32_t iCmp = 1;
if (LD32 (pYSrc) != LD32 (pYRef)) return 1;
if (LD32 (pYSrc + 4) != LD32 (pYRef + 4)) return 1;
if (LD32 (pYSrc + 8) != LD32 (pYRef + 8)) return 1;
if (kiWidth > 12)
iCmp = WelsMemcmp (pYSrc + 12, pYRef + 12, kiWidth - 12);
return iCmp;
}
void ScrollDetectionCore (SPixMap* pSrcPixMap, SPixMap* pRefPixMap, int32_t iWidth, int32_t iHeight,
int32_t iOffsetX, int32_t iOffsetY, SScrollDetectionParam& sScrollDetectionParam) {
bool bScrollDetected = 0;
uint8_t* pYLine;
uint8_t* pYTmp;
int32_t iTestPos, iSearchPos = 0, iOffsetAbs, iMaxAbs;
int32_t iPicHeight = pRefPixMap->sRect.iRectHeight;
int32_t iMinHeight = WELS_MAX (iOffsetY, 0);
int32_t iMaxHeight = WELS_MIN (iOffsetY + iHeight - 1, iPicHeight - 1) ; //offset_y + height - 1;//
uint8_t* pYRef, *pYSrc;
int32_t iYStride;
pYRef = (uint8_t*)pRefPixMap->pPixel[0];
pYSrc = (uint8_t*)pSrcPixMap->pPixel[0];
iYStride = pRefPixMap->iStride[0];
iTestPos = SelectTestLine (pYSrc, iWidth, iHeight, iPicHeight, iYStride, iOffsetX, iOffsetY);
if (iTestPos == -1) {
sScrollDetectionParam.bScrollDetectFlag = 0;
return;
}
pYLine = pYSrc + iYStride * iTestPos + iOffsetX;
iMaxAbs = WELS_MIN (WELS_MAX (iTestPos - iMinHeight - 1, iMaxHeight - iTestPos), MAX_SCROLL_MV_Y);
iSearchPos = iTestPos;
for (iOffsetAbs = 0; iOffsetAbs <= iMaxAbs; iOffsetAbs++) {
iSearchPos = iTestPos + iOffsetAbs;
if (iSearchPos <= iMaxHeight) {
pYTmp = pYRef + iSearchPos * iYStride + iOffsetX;
if (!CompareLine (pYLine, pYTmp, iWidth)) {
uint8_t* pYUpper, *pYLineUpper;
int32_t iCheckedLines;
int32_t iLowOffset = WELS_MIN (iMaxHeight - iSearchPos, CHECK_OFFSET);
int32_t i;
iCheckedLines = WELS_MIN (iTestPos - iMinHeight + iLowOffset, 2 * CHECK_OFFSET);
pYUpper = pYTmp - (iCheckedLines - iLowOffset) * iYStride;
pYLineUpper = pYLine - (iCheckedLines - iLowOffset) * iYStride;
for (i = 0; i < iCheckedLines; i ++) {
if (CompareLine (pYLineUpper, pYUpper, iWidth)) {
break;
}
pYUpper += iYStride;
pYLineUpper += iYStride;
}
if (i == iCheckedLines) {
bScrollDetected = 1;
break;
}
}
}
iSearchPos = iTestPos - iOffsetAbs - 1;
if (iSearchPos >= iMinHeight) {
pYTmp = pYRef + iSearchPos * iYStride + iOffsetX;
if (!CompareLine (pYLine, pYTmp, iWidth)) {
uint8_t* pYUpper, *pYLineUpper;
int32_t iCheckedLines;
int32_t iUpOffset = WELS_MIN (iSearchPos - iMinHeight, CHECK_OFFSET);
int32_t i;
pYUpper = pYTmp - iUpOffset * iYStride;
pYLineUpper = pYLine - iUpOffset * iYStride;
iCheckedLines = WELS_MIN (iMaxHeight - iTestPos + iUpOffset, 2 * CHECK_OFFSET);
for (i = 0; i < iCheckedLines; i ++) {
if (CompareLine (pYLineUpper, pYUpper, iWidth)) {
break;
}
pYUpper += iYStride;
pYLineUpper += iYStride;
}
if (i == iCheckedLines) {
bScrollDetected = 1;
break;
}
}
}
}
if (!bScrollDetected) {
sScrollDetectionParam.bScrollDetectFlag = 0;
} else {
sScrollDetectionParam.bScrollDetectFlag = 1;
sScrollDetectionParam.iScrollMvY = iSearchPos - iTestPos; // pre_pos - cur_pos, change to mv
sScrollDetectionParam.iScrollMvX = 0;
}
}
WELSVP_NAMESPACE_END