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123 lines
3.6 KiB
C
123 lines
3.6 KiB
C
/*
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* Linux VeeJay
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*
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* Copyright(C)2004 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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/*
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Nervous is loosly based on Kentaro's Nervous effect, found
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in EffecTV ( http://effectv.sf.net ).
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*/
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#include "common.h"
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#include <veejaycore/vjmem.h>
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#include "nervous.h"
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#define N_MAX 100
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#define RUP8(num)(((num)+8)&~8)
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static uint8_t *nervous_buf[4] = { NULL,NULL,NULL,NULL }; // huge buffer
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static int frames_elapsed;
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vj_effect *nervous_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 = 1;
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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] = N_MAX;
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ve->defaults[0] = N_MAX;
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ve->description = "Nervous";
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ve->sub_format = -1;
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ve->extra_frame = 0;
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ve->has_user = 0;
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ve->param_description = vje_build_param_list( ve->num_params, "Buffer length");
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return ve;
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}
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int nervous_malloc(int w, int h )
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{
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const int total_len = RUP8(w * h * N_MAX * 4);
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nervous_buf[0] = (uint8_t*) vj_malloc(sizeof(uint8_t) * total_len);
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if(!nervous_buf[0]) {
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return 0;
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}
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nervous_buf[1] = nervous_buf[0] + RUP8(w*h*N_MAX);
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nervous_buf[2] = nervous_buf[1] + RUP8(w*h*N_MAX);
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nervous_buf[3] = nervous_buf[2] + RUP8(w*h*N_MAX);
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frames_elapsed = 0;
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vj_frame_clear1( nervous_buf[0], 0, (w*h) * N_MAX );
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vj_frame_clear1( nervous_buf[1], 128, (w*h) * N_MAX );
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vj_frame_clear1( nervous_buf[2], 128, (w*h) * N_MAX );
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vj_frame_clear1( nervous_buf[3], 0, (w*h) * N_MAX );
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return 1;
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}
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void nervous_free(void)
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{
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if( nervous_buf[0] ) free(nervous_buf[0]);
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nervous_buf[0] = NULL;
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nervous_buf[1] = NULL;
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nervous_buf[2] = NULL;
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nervous_buf[3] = NULL;
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}
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void nervous_apply( VJFrame *frame, int delay)
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{
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const int len = frame->len;
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int uv_len = (frame->ssm == 1 ? len : frame->uv_len);
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uint8_t *NY = nervous_buf[0] + (len * frames_elapsed );
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uint8_t *NCb= nervous_buf[1] + (uv_len * frames_elapsed );
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uint8_t *NCr= nervous_buf[2] + (uv_len * frames_elapsed );
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uint8_t *NA = nervous_buf[3] + (len * frames_elapsed);
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uint8_t *dest[4] = { NY, NCb, NCr, NA };
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int strides[4] = { len, uv_len,uv_len, len };
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// copy original into nervous buf
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vj_frame_copy( frame->data, dest, strides );
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if(frames_elapsed > 0)
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{
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// take a random frame
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unsigned int index = (unsigned int) ((double)frames_elapsed * rand() / (RAND_MAX+1.0) );
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// setup pointers
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uint8_t *sY = nervous_buf[0] + (len * index);
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uint8_t *sCb = nervous_buf[1] + (uv_len * index);
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uint8_t *sCr = nervous_buf[2] + (uv_len * index);
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uint8_t *sA = nervous_buf[3] + (len * index);
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// copy it to dst
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dest[0] = sY;
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dest[1] = sCb;
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dest[2] = sCr;
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dest[3] = sA;
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vj_frame_copy( dest, frame->data, strides );
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}
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frames_elapsed ++;
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if( frames_elapsed == N_MAX )
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frames_elapsed = 0;
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}
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