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// Copyright (C) 2010 Dirk Vanden Boer <dirk.vdb@gmail.com>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef GRAYSCALEFILTER_H
#define GRAYSCALEFILTER_H
#include "videoframe.h"
namespace ffmpegthumbnailer
{
class GrayScaleFilter : public IFilter
{
public:
void process(VideoFrame& videoFrame)
{
for (int i = 0; i < videoFrame.height; ++i)
{
for (int j = 0; j < videoFrame.width; ++j)
{
int pixelIndex = (i * videoFrame.lineSize) + (j * 3);
uint8_t grayValue = ( videoFrame.frameData[pixelIndex]
+ videoFrame.frameData[pixelIndex+1]
+ videoFrame.frameData[pixelIndex+2] ) / 3;
videoFrame.frameData[pixelIndex] = grayValue;
videoFrame.frameData[pixelIndex+1] = grayValue;
videoFrame.frameData[pixelIndex+2] = grayValue;
}
}
}
};
}
#endif
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