ref: c2e37d59bb9bc720b9fe1108fafd8cb673904643
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