veejay/veejay-current/veejay-server/libvje/effects/chromascratcher.c

/* 
 * Linux VeeJay
 *
 * Copyright(C)2002 Niels Elburg <elburg@hio.hen.nl>
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 , USA.
 */
#include <config.h>
#include <stdint.h>
#include <stdio.h>
#include <libvjmem/vjmem.h>
#include "common.h"
#include "chromascratcher.h"
#include "chromamagick.h"
#define    RUP8(num)(((num)+8)&~8)
static uint8_t *cframe[4] = {NULL,NULL,NULL,NULL};
static int cnframe = 0;
static int cnreverse = 0;
static int chroma_restart = 0;

static VJFrame _tmp;

vj_effect *chromascratcher_init(int w, int h)
{
    vj_effect *ve = (vj_effect *) vj_calloc(sizeof(vj_effect));
    ve->num_params = 4;
    ve->defaults = (int *) vj_calloc(sizeof(int) * ve->num_params);	/* default values */
    ve->limits[0] = (int *) vj_calloc(sizeof(int) * ve->num_params);	/* min */
    ve->limits[1] = (int *) vj_calloc(sizeof(int) * ve->num_params);	/* max */
    ve->limits[0][0] = 0;
    ve->limits[1][0] = (MAX_SCRATCH_FRAMES-1); /* uses the chromamagick effect for scratchign */
    ve->limits[0][1] = 0;
    ve->limits[1][1] = 255;
    ve->limits[0][2] = 0;
    ve->limits[1][2] = 25;
    ve->limits[0][3] = 0;
    ve->limits[1][3] = 1;

    ve->defaults[0] = 1;
    ve->defaults[1] = 150;
    ve->defaults[2] = 8;
    ve->defaults[3] = 1;
    ve->description = "Matte Scratcher";
    ve->sub_format = 1;
    ve->extra_frame = 0;
	ve->has_user =0;
	ve->param_description = vje_build_param_list(ve->num_params, "Mode", "Value", "Length", "Pingpong" );

      return ve;
}

int	chromascratcher_malloc(int w, int h)
{
    cframe[0] =
	(uint8_t *) vj_malloc( RUP8(w * h * 3) * MAX_SCRATCH_FRAMES * sizeof(uint8_t) );
    if(!cframe[0]) return 0;			   

    cframe[1] = cframe[0] + ( w * h * MAX_SCRATCH_FRAMES );
    cframe[2] = cframe[1] + ( w * h * MAX_SCRATCH_FRAMES );


    int strides[4] = { w * h * MAX_SCRATCH_FRAMES, w * h * MAX_SCRATCH_FRAMES, w * h * MAX_SCRATCH_FRAMES, 0 };
    vj_frame_clear( cframe, strides, 128 );

    return 1;
}

void chromascratcher_free() {
   if(cframe[0])
	   free(cframe[0]);
   cframe[0] = NULL;
   cframe[1] = NULL;
   cframe[2] = NULL;
}

void chromastore_frame(VJFrame *src, int w, int h, int n, int no_reverse)
{
	int strides[4] = { (w * h), (w*h), (w*h) , 0 };
	uint8_t *Y = src->data[0];
	uint8_t *Cb= src->data[1];
	uint8_t *Cr= src->data[2];

	uint8_t *dest[4] = {
		cframe[0] + (w*h*cnframe),
		cframe[1] + (w*h*cnframe),
		cframe[2] + (w*h*cnframe),
       		NULL	};

	if (!cnreverse) {
		vj_frame_copy( src->data, dest, strides ); 
    	} else {
		vj_frame_copy( dest, src->data, strides );
    	}

	if (cnreverse)
		cnframe--;
	else
		cnframe++;

	if (cnframe >= n) {
		if (no_reverse == 0) {
		    cnreverse = 1;
		    cnframe = n - 1;
		} else {
		    cnframe = 0;
		}
    	}

   	if (cnframe == 0)
		cnreverse = 0;

}



void chromascratcher_apply(VJFrame *frame,
			   int width, int height, int mode, int opacity,
			   int n, int no_reverse)
{
    int i;
    const int len = frame->len;
    const unsigned int op_a = (opacity > 255) ? 255 : opacity;
    const unsigned int op_b = 255 - op_a;
    const int offset = len * cnframe;
 	uint8_t *Y = frame->data[0];
	uint8_t *Cb = frame->data[1];
	uint8_t *Cr = frame->data[2];
    veejay_memcpy( &_tmp, frame, (sizeof(VJFrame)));
	_tmp.data[0] = cframe[0];
	_tmp.data[1] = cframe[1];
	_tmp.data[2] = cframe[2];

    if(no_reverse != chroma_restart)
    {
		chroma_restart = no_reverse;
		cnframe = n;
    }

    if( cnframe == 0 ) {
	_tmp.data[0] = frame->data[0];
	_tmp.data[1] = frame->data[1];
	_tmp.data[2] = frame->data[2];
    }

    if(mode>3) {
	   int matte_mode = mode - 3;
   	   chromamagick_apply( frame,&_tmp,width, height,matte_mode,opacity);
    }
    else {
	    switch (mode) {		/* scratching with a sequence of frames (no scene changes) */

		case 0:
			/* moving parts will dissapear over time */
			for (i = 0; i < len; i++) {
			    if (cframe[0][offset + i] < Y[i]) {
					Y[i] = cframe[0][offset + i];
					Cb[i] = cframe[1][offset + i];
					Cr[i] = cframe[2][offset + i];
			    }
			}
			break;
   		 case 1:
			for (i = 0; i < len; i++) {
			    /* moving parts will remain visible */
			    if (cframe[0][offset + i] > Y[i]) {
					Y[i] = cframe[0][offset + i];
					Cb[i] = cframe[1][offset + i];
					Cr[i] = cframe[2][offset + i];
		    		}
			}
		break;
  	  case 2:
		for (i = 0; i < len; i++) {
		    if ((cframe[0][offset + i] * op_a) < (Y[i] * op_b)) {
				Y[i] = cframe[0][offset + i];
				Cb[i] = cframe[1][offset + i];
					Cr[i] = cframe[2][offset + i];
	 	   }
		}
		break;
	   case 3:
		for (i = 0; i < len; i++) {
		    /* moving parts will remain visible */
		    if ((cframe[0][offset + i] * op_a) > (Y[i] * op_b)) {
			Y[i] = cframe[0][offset + i];
			Cb[i] = cframe[1][offset + i];
			Cr[i] = cframe[2][offset + i];
		    }
		}
		break;
    
		}

	}


	chromastore_frame(frame, width, height, n, no_reverse);
}