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https://github.com/game-stop/veejay.git
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90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
/*
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* Linux VeeJay
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*
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* Copyright(C)2019 Niels Elburg <nwelburg@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License , or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 , USA.
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*/
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#include "common.h"
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#include <veejaycore/vjmem.h>
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#include "stretch.h"
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vj_effect *stretch_init(int w, int h)
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{
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vj_effect *ve = (vj_effect *) vj_calloc(sizeof(vj_effect));
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ve->num_params = 4;
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ve->defaults = (int *) vj_calloc(sizeof(int) * ve->num_params); /* default values */
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ve->limits[0] = (int *) vj_calloc(sizeof(int) * ve->num_params); /* min */
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ve->limits[1] = (int *) vj_calloc(sizeof(int) * ve->num_params); /* max */
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ve->limits[0][0] = 0;
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ve->limits[1][0] = 255;
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ve->limits[0][1] = 0;
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ve->limits[1][1] = 255;
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ve->limits[0][2] = 0;
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ve->limits[1][2] = 1000;
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ve->limits[0][3] = 0;
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ve->limits[1][3] = 1000;
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ve->defaults[0] = 255;
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ve->defaults[1] = 0;
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ve->defaults[2] = 40;
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ve->defaults[3] = 0;
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ve->description = "Chroma Stretch";
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ve->sub_format = 1;
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ve->extra_frame = 0;
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ve->parallel = 1;
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ve->has_user = 0;
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ve->param_description = vje_build_param_list( ve->num_params, "Upper bound", "Lower bound", "Gain factor", "Saturation Amplifier");
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return ve;
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}
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void stretch_apply( void *ptr, VJFrame *frame, int *args )
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{
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unsigned int i;
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const int len = frame->len;
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uint8_t *Y = frame->data[0];
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uint8_t *Cb = frame->data[1];
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uint8_t *Cr = frame->data[2];
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int upper = args[0];
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int lower = args[1];
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int gain = args[2];
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int gain_saturation = args[3];
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double gainFactor = (gain * 0.01);
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double satFactor = (gain_saturation * 0.01);
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double cb,cr;
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if( gain_saturation > 0 )
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gainFactor *= satFactor;
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for( i = 0; i < len; i ++ ) {
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if( Y[i] > lower && Y[i] < upper ) {
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cb = (double)(Cb[i]);
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cr = (double)(Cr[i]);
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Cb[i] = (cb + (cb * gainFactor));
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Cr[i] = (cr - (cr * gainFactor));
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}
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}
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}
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