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Don't downsample to anything smaller than 4x4 pixels

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This makes for a chroma plane of 2x2. The SIMD versionf of generic
downscalers assume that the width and height is at least 2, since
it does an unconditional loop for the body of the image, and a
separate step for the last pixel and last row. The SIMD versions
assume that (width-1) and (height-1) are larger than zero.

This fixes spurious crashes in EncodeDecodeTestAPI.SetOptionEncParamExt.
This commit is contained in:
Martin Storsjö 2015-02-28 14:57:00 +02:00
parent 67664f4dc0
commit e8cdbd2ea7
1 changed files with 2 additions and 2 deletions
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4
codec/encoder/core/src/wels_preprocess.cpp
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@ -430,9 +430,9 @@ bool JudgeNeedOfScaling (SWelsSvcCodingParam* pParam, Scaled_Picture* pScaledPic
if (iInputWidthXDstHeight > iInputHeightXDstWidth) {
pScaledPicture->iScaledWidth[iSpatialIdx] = iCurDstWidth;
pScaledPicture->iScaledHeight[iSpatialIdx] = WELS_MAX (iInputHeightXDstWidth / kiInputPicWidth, 2);
pScaledPicture->iScaledHeight[iSpatialIdx] = WELS_MAX (iInputHeightXDstWidth / kiInputPicWidth, 4);
} else {
pScaledPicture->iScaledWidth[iSpatialIdx] = WELS_MAX (iInputWidthXDstHeight / kiInputPicHeight, 2);
pScaledPicture->iScaledWidth[iSpatialIdx] = WELS_MAX (iInputWidthXDstHeight / kiInputPicHeight, 4);
pScaledPicture->iScaledHeight[iSpatialIdx] = iCurDstHeight;
}
}