mirror of
https://github.com/game-stop/veejay.git
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133 lines
3.7 KiB
C
133 lines
3.7 KiB
C
/*
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* Linux VeeJay
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*
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* Copyright(C)2002 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 "tracer.h"
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#define func_opacity(a,b,p,q) ( ((a * p) + (b * q)) >> 8 )
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typedef struct {
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uint8_t *trace_buffer[4];
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int trace_counter;
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} tracer_t;
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vj_effect *tracer_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] = 1;
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ve->limits[1][1] = 25;
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ve->defaults[0] = 150;
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ve->defaults[1] = 8;
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ve->description = "Tracer (Frame Echo)";
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ve->sub_format = 0;
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ve->extra_frame = 1;
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ve->has_user = 0;
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ve->param_description = vje_build_param_list( ve->num_params, "Opacity", "Buffer length");
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return ve;
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}
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void *tracer_malloc(int w, int h)
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{
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tracer_t *t = (tracer_t*) vj_calloc(sizeof(tracer_t));
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if(!t) {
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return NULL;
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}
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const int len = RUP8(w * h);
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const int total_len = RUP8(len * 3);
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t->trace_buffer[0] = (uint8_t *) vj_malloc(sizeof(uint8_t) * total_len );
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if(!t->trace_buffer[0]) {
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free(t);
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return NULL;
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}
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t->trace_buffer[1] = t->trace_buffer[0] + len;
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t->trace_buffer[2] = t->trace_buffer[1] + len;
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return (void*) t;
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}
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void tracer_free(void *ptr) {
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tracer_t *t = (tracer_t*) ptr;
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if(t->trace_buffer[0])
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free(t->trace_buffer[0]);
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free(t);
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}
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void tracer_apply(void *ptr,VJFrame *frame, VJFrame *frame2, int *args )
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{
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unsigned int x;
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const int len = frame->len;
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unsigned int uv_len = frame->uv_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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uint8_t *Y2 = frame2->data[0];
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uint8_t *Cb2= frame2->data[1];
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uint8_t *Cr2= frame2->data[2];
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int opacity = args[0];
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int n = args[1];
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tracer_t *t = (tracer_t*) ptr;
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unsigned int op1 = (opacity > 255) ? 255 : opacity;
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unsigned int op0 = 255 - op1;
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uint8_t **trace_buffer = t->trace_buffer;
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if (t->trace_counter == 0)
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{
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for (x = 0; x < len; x++)
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{
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Y[x] = func_opacity(Y[x], Y2[x], op0, op1);
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}
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for (x = 0; x < uv_len; x++)
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{
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Cb[x] = func_opacity(Cb[x], Cb2[x], op0, op1);
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Cr[x] = func_opacity(Cr[x], Cr2[x], op0, op1);
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}
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int strides[4] = { len, uv_len, uv_len, 0 };
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vj_frame_copy( frame->data, trace_buffer, strides );
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}
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else
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{
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for (x = 0; x < len; x++)
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{
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Y[x] = ((op0 * Y[x]) + (op1 * trace_buffer[0][x])) >> 8;
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}
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for (x = 0; x < uv_len; x++)
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{
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Cb[x] = ((op0 * Cb[x]) + (op1 * trace_buffer[1][x])) >> 8;
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Cr[x] = ((op0 * Cr[x]) + (op1 * trace_buffer[2][x])) >> 8;
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}
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int strides[4] = { len, uv_len, uv_len, 0 };
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vj_frame_copy( frame->data, trace_buffer, strides );
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}
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t->trace_counter++;
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if (t->trace_counter >= n)
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t->trace_counter = 0;
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}
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