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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* transcoder.cc
*
* Wed Jul 19 22:11:02 CEST 2006
* Copyright 2006 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of MIaV.
*
* MIaV 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.
*
* MIaV 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 MIaV; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "transcoder.h"
/*
R = Y + 1.4075 * (V - 128)
G = Y - (0.3455 * (U - 128) - (0.7169 * (V - 128))
B = Y + 1.7790 * (U - 128)
*/
#define RED(y, u, v) (y + 1.4075 * (v - 128))
#define GREEN(y, u, v) (y - (0.3455 * (u - 128)) - (0.7169 * (v - 128)))
#define BLUE(y, u, v) (y + 1.7790 * (u - 128))
/*
R = 1.164(Y - 16) + 1.596(V - 128)
G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
B = 1.164(Y - 16) + 2.018(U - 128)
*/
//#define RED(y, u, v) (1.164 * (y - 16) + 1.596 * (v - 128))
//#define GREEN(y, u, v) (1.164 * (y - 16) - 0.813 * (v - 128) - 0.391 * (u - 128))
//#define BLUE(y, u, v) (1.164 * (y - 16) + 2.018 * (u - 128))
static Frame *transcode_yuv2brg0(Frame *input, char* rgb, int bufsz)
{
if(!rgb) { // No buffer supplied, creating one.
rgb = new char[720 * 576 * 4];
bufsz = 720 * 576 * 4;
}
if(bufsz < 720 * 576 * 4) return NULL; // Buffer is too small.
unsigned char Y0, Y1, U, V;
unsigned int byte = 0;
unsigned int pos = 0;
char *pframe = input->vframe;
while(pos < 720*576*4) {
// YUV 4:2:2 packing
// Y0 U0 Y1 V1 Y2 U2 Y3 V3
// [Y0 U0 V1] [Y1 U0 V1] [Y2 U2 V3] [Y3 U2 V3]
Y0 = pframe[byte]; byte++;
U = pframe[byte]; byte++;
Y1 = pframe[byte]; byte++;
V = pframe[byte]; byte++;
rgb[pos+3] = 0; // Alpha
rgb[pos+2] = (unsigned char)RED(Y0, U, V); // Red
rgb[pos+1] = (unsigned char)GREEN(Y0, U, V); // Green
rgb[pos+0] = (unsigned char)BLUE(Y0, U, V); // Blue
pos+=4;
rgb[pos+3] = 0; // Alpha
rgb[pos+2] = (unsigned char)RED(Y1, U, V); // Red
rgb[pos+1] = (unsigned char)GREEN(Y1, U, V); // Green
rgb[pos+0] = (unsigned char)BLUE(Y1, U, V); // Blue
pos+=4;
}
return new Frame(rgb, bufsz, VF_BRG0, NULL, 0, AF_NONE);
}
Frame *transcode(Frame *input,
video_format_t vformat, char *vbuffer, int vbuffer_size,
audio_format_t aformat, char *abuffer, int abuffer_size)
{
// YUV422 => BRG0
if(vformat == VF_BRG0 && input->vformat == VF_YUV422 &&
aformat == AF_NONE && abuffer == NULL)
return transcode_yuv2brg0(input, vbuffer, vbuffer_size);
// Unknown transcoding!
return NULL;
}
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