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Initial checkin of veejay 1.4
git-svn-id: svn://code.dyne.org/veejay/trunk@1172 eb8d1916-c9e9-0310-b8de-cf0c9472ead5
This commit is contained in:
Niels Elburg
261
veejay-current/veejay-server/libvje/effects/keyselect.c
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261
veejay-current/veejay-server/libvje/effects/keyselect.c
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/*
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* Linux VeeJay
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*
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* Copyright(C)2004 Niels Elburg <elburg@hio.hen.nl>
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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 <stdint.h>
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#include <libvjmem/vjmem.h>
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#include "rgbkey.h"
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#include <math.h>
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#include "common.h"
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vj_effect *keyselect_init(int w, int h)
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{
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vj_effect *ve;
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ve = (vj_effect *) vj_calloc(sizeof(vj_effect));
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ve->num_params = 6;
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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->defaults[0] = 300; /* angle */
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ve->defaults[1] = 255; /* r */
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ve->defaults[2] = 0; /* g */
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ve->defaults[3] = 0; /* b */
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ve->defaults[4] = 3; /* blend type */
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ve->defaults[5] = 2400; /* noise suppression */
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ve->limits[0][0] = 5;
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ve->limits[1][0] = 900;
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ve->limits[0][1] = 0;
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ve->limits[1][1] = 256;
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ve->limits[0][2] = 0;
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ve->limits[1][2] = 256;
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ve->limits[0][3] = 0;
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ve->limits[1][3] = 256;
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ve->limits[0][4] = 0;
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ve->limits[1][4] = 7;
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ve->limits[0][5] = 0;
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ve->limits[1][5] = 3500;
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ve->has_user = 0;
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ve->description = "Blend by Color Key";
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ve->extra_frame = 1;
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ve->sub_format = 1;
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ve->rgb_conv = 1;
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ve->param_description = vje_build_param_list(ve->num_params, "Angle","Red","Green","Blue","Blend mode","Noise suppression" );
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return ve;
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}
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typedef uint8_t(*blend_func)(uint8_t y1, uint8_t y2);
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blend_func get_blend_func(const int mode);
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uint8_t blend_func1(uint8_t a, uint8_t b) {
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return (uint8_t) 255 - (abs(255-a-b));
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}
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uint8_t blend_func2(uint8_t a, uint8_t b) {
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uint8_t val;
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if(a < pixel_Y_lo_) a = pixel_Y_lo_;
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if(b < pixel_Y_lo_) b = pixel_Y_lo_;
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val = 255 - ((255-b) * (255-b))/a;
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return CLAMP_Y(val);
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}
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uint8_t blend_func3(uint8_t a , uint8_t b) {
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return (uint8_t) (a * b)>>8;
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}
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uint8_t blend_func4(uint8_t a, uint8_t b) {
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uint8_t val;
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if(b > pixel_Y_hi_) b = pixel_Y_hi_;
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val = (a * a) / ( 255 - b );
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return CLAMP_Y(val);
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}
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uint8_t blend_func5(uint8_t a, uint8_t b) {
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uint8_t val;
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int c = 255 - b;
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if( c < pixel_Y_lo_ )
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c = pixel_Y_lo_;
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val = b / c;
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return CLAMP_Y(val);
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}
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uint8_t blend_func6(uint8_t a, uint8_t b) {
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uint8_t val = a + (2 * (b)) - 255;
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return CLAMP_Y(val);
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}
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uint8_t blend_func7(uint8_t a, uint8_t b) {
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return (uint8_t) ( a + ( b - 255) );
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}
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uint8_t blend_func8(uint8_t a, uint8_t b) {
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int c;
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if(b < 128) c = (a * b) >> 7;
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else c = 255 - ((255-b)*(255-a)>>7);
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return CLAMP_Y(c);
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}
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blend_func get_blend_func(const int mode) {
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switch(mode) {
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case 0: return &blend_func1;
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case 1: return &blend_func2;
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case 2: return &blend_func3;
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case 3: return &blend_func4;
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case 4: return &blend_func5;
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case 5: return &blend_func6;
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case 6: return &blend_func7;
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case 7: return &blend_func8;
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}
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return &blend_func1;
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}
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/*
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http://www.cs.utah.edu/~michael/chroma/
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*/
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void keyselect_apply( VJFrame *frame, VJFrame *frame2, int width,
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int height, int i_angle, int r, int g,
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int b, int mode, int i_noise)
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{
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uint8_t *fg_y, *fg_cb, *fg_cr;
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uint8_t *bg_y, *bg_cb, *bg_cr;
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int accept_angle_tg, accept_angle_ctg, one_over_kc;
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int kfgy_scale, kg;
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int cb, cr;
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int kbg, x1, y1;
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float kg1, tmp, aa = 128, bb = 128, _y = 0;
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float angle = (float) i_angle * 0.1f;
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float noise_level = (i_noise * 0.01f);
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unsigned int pos;
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uint8_t val, tmp1;
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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 iy=pixel_Y_lo_,iu=128,iv=128;
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_rgb2yuv( r,g,b, iy,iu,iv );
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_y = (float) iy;
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aa = (float) iu;
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bb = (float) iv;
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tmp = sqrt(((aa * aa) + (bb * bb)));
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cb = 127 * (aa / tmp);
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cr = 127 * (bb / tmp);
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kg1 = tmp;
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blend_func blend_pixel = get_blend_func(mode);
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/* obtain coordinate system for cb / cr */
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accept_angle_tg = 0xf * tan(M_PI * angle / 180.0);
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accept_angle_ctg = 0xf / tan(M_PI * angle / 180.0);
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tmp = 1 / kg1;
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one_over_kc = 0xff * 2 * tmp - 0xff;
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kfgy_scale = 0xf * (float) (_y) / kg1;
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kg = kg1;
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/* intialize pointers */
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fg_y = Y;
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fg_cb = Cb;
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fg_cr = Cr;
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/* 2005: swap these !! */
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bg_y = Y2;
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bg_cb = Cb2;
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bg_cr = Cr2;
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for (pos = (width * height); pos != 0; pos--) {
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short xx, yy;
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/* convert foreground to xz coordinates where x direction is
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defined by key color */
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xx = (((fg_cb[pos]) * cb) + ((fg_cr[pos]) * cr)) >> 7;
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if (xx < -128) {
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xx = -128;
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}
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if (xx > 127) {
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xx = 127;
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}
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yy = (((fg_cr[pos]) * cb) - ((fg_cb[pos]) * cr)) >> 7;
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if (yy < -128) {
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yy = -128;
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}
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if (yy > 127) {
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yy = 127;
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}
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/* accept angle should not be > 90 degrees
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reasonable results between 10 and 80 degrees.
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*/
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val = (xx * accept_angle_tg) >> 4;
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if (val > 127)
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val = 127;
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if (abs(yy) < val) {
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/* compute fg, suppress fg in xz according to kfg
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*/
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val = (yy * accept_angle_ctg) >> 4;
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x1 = abs(val);
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y1 = yy;
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tmp1 = xx - x1;
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kbg = (tmp1 * one_over_kc) >> 1;
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if (kbg < 0)
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kbg = 0;
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if (kbg > 255)
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kbg = 255;
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val = (tmp1 * kfgy_scale) >> 4;
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val = fg_y[pos] - val;
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Y[pos] = val;
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// convert suppressed fg back to cbcr
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// cb,cr are signed, go back to unsigned !
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val = ((x1 * (cb-128)) - (y1 * (cr-128))) >> 7;
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Cb[pos] = val;
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val = ((x1 * (cr-128)) - (y1 * (cb-128))) >> 7;
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Cr[pos] = val;
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// deal with noise
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val = (yy * yy) + (kg * kg);
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if (val < (noise_level * noise_level)) {
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kbg = 255;
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}
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val = (Y[pos] + (kbg * bg_y[pos])) >> 8;
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Y[pos] = blend_pixel( val, fg_y[pos] );
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}
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}
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}
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void keyselect_free(){}
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