mirror of
https://github.com/game-stop/veejay.git
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77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/*
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* Linux VeeJay
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*
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* Copyright(C)2023 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 "rainbowshift.h"
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vj_effect *rainbowshift_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 = 2;
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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] = 10;
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ve->defaults[0] = 1;
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ve->defaults[1] = 1;
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ve->description = "Rainbow Shift";
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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, "Amplitude", "Frequency" );
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return ve;
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}
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void rainbowshift_apply( void *ptr, VJFrame *frame, int *args ) {
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int shift_amplitude = args[0];
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int shift_frequency = args[1];
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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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/*
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for( i = 0; i < len; i ++ ) {
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int shift = (Y[i] * shift_factor) >> 8;
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Cb[i] = ( Cb[i] + shift ) & 255;
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Cr[i] = ( Cr[i] - shift ) & 255;
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}
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*/
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for (i = 0; i < len; i++) {
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double wave_shift = shift_amplitude * a_sin(2 * M_PI * shift_frequency * i / len);
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Cb[i] = (Cb[i] + (int)wave_shift) & 255;
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Cr[i] = (Cr[i] - (int)wave_shift) & 255;
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Y[i] = (Y[i] + (int)wave_shift) & 255;
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}
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}
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