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/************************************************************************************
This source file is part of the Theora Video Playback Library
For latest info, see http://libtheoraplayer.googlecode.com
*************************************************************************************
Copyright (c) 2008-2014 Kresimir Spes (kspes@cateia.com)
This program is free software; you can redistribute it and/or modify it under
the terms of the BSD license: http://opensource.org/licenses/BSD-3-Clause
*************************************************************************************/
#include "yuv_util.h"
static void _decodeYUV(struct TheoraPixelTransform* t, int stride, int nBytes, int maxWidth)
{
int cv, cu, y1, y2, y3, y4, width = maxWidth == 0 ? t->w : maxWidth;
unsigned char *ySrcEven, *ySrcOdd, *yLineEnd, *uSrc, *vSrc, *out1, *out2;
unsigned int y;
for (y=0; y < t->h; y += 2)
{
ySrcEven = t->y + y * t->yStride;
ySrcOdd = t->y + (y + 1) * t->yStride;
uSrc = t->u + y * t->uStride / 2;
vSrc = t->v + y * t->vStride / 2;
out1 = t->out + y * stride;
out2 = t->out + (y + 1) * stride;
for (yLineEnd = ySrcEven + width; ySrcEven != yLineEnd;)
{
// EVEN columns
cu = *uSrc; ++uSrc;
cv = *vSrc; ++vSrc;
y1 = *ySrcEven; ++ySrcEven;
y2 = *ySrcOdd; ++ySrcOdd;
y3 = *ySrcEven; ++ySrcEven;
y4 = *ySrcOdd; ++ySrcOdd;
// EVEN columns
out1[0] = y1;
out1[1] = cu;
out1[2] = cv;
out2[0] = y2;
out2[1] = cu;
out2[2] = cv;
out1 += nBytes; out2 += nBytes;
// ODD columns
out1[0] = y3;
out1[1] = cu;
out1[2] = cv;
out2[0] = y4;
out2[1] = cu;
out2[2] = cv;
out1 += nBytes; out2 += nBytes;
}
}
}
void decodeYUV(struct TheoraPixelTransform* t)
{
_decodeYUV(t, t->w * 3, 3, 0);
}
void decodeYUVA(struct TheoraPixelTransform* t)
{
_decodeYUV(t, t->w * 4, 4, 0);
_decodeAlpha(incOut(t, 3), t->w * 4);
}
void decodeYUVX(struct TheoraPixelTransform* t)
{
_decodeYUV(t, t->w * 4, 4, 0);
}
void decodeAYUV(struct TheoraPixelTransform* t)
{
_decodeYUV(incOut(t, 1), t->w * 4, 4, 0);
_decodeAlpha(t, t->w * 4);
}
void decodeXYUV(struct TheoraPixelTransform* t)
{
_decodeYUV(incOut(t, 1), t->w * 4, 4, 0);
}
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