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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
#include "filmstripfilter.h"
#include "filmstrip.h"
#include <cstddef>
namespace ffmpegthumbnailer
{
static const uint8_t* determineFilmStrip(uint32_t videoWidth, uint32_t& filmStripWidth, uint32_t& filmStripHeight)
{
if (videoWidth <= SMALLEST_FILM_STRIP_WIDTH * 2)
{
return NULL;
}
if (videoWidth <= 96)
{
filmStripWidth = filmStripHeight = 4;
return filmStrip4;
}
if (videoWidth <= 192)
{
filmStripWidth = filmStripHeight = 8;
return filmStrip8;
}
if (videoWidth <= 384)
{
filmStripWidth = filmStripHeight = 16;
return filmStrip16;
}
if (videoWidth <= 768)
{
filmStripWidth = filmStripHeight = 32;
return filmStrip32;
}
filmStripWidth = filmStripHeight = 64;
return filmStrip64;
}
void FilmStripFilter::process(VideoFrame& videoFrame)
{
uint32_t filmStripWidth;
uint32_t filmStripHeight;
const uint8_t* filmHole = determineFilmStrip(videoFrame.width, filmStripWidth, filmStripHeight);
if (!filmHole)
{
return;
}
int frameIndex = 0;
int filmHoleIndex = 0;
int offset = (videoFrame.width * 3) - 3;
for (int32_t i = 0; i < videoFrame.height; ++i)
{
for (uint32_t j = 0; j < filmStripWidth * 3; j+=3)
{
int currentFilmHoleIndex = filmHoleIndex + j;
videoFrame.frameData[frameIndex + j] = filmHole[currentFilmHoleIndex];
videoFrame.frameData[frameIndex + j + 1] = filmHole[currentFilmHoleIndex + 1];
videoFrame.frameData[frameIndex + j + 2] = filmHole[currentFilmHoleIndex + 2];
videoFrame.frameData[frameIndex + offset - j] = filmHole[currentFilmHoleIndex];
videoFrame.frameData[frameIndex + offset - j + 1] = filmHole[currentFilmHoleIndex + 1];
videoFrame.frameData[frameIndex + offset - j + 2] = filmHole[currentFilmHoleIndex + 2];
}
frameIndex += videoFrame.lineSize;
filmHoleIndex = (i % filmStripHeight) * filmStripWidth * 3;
}
}
}
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