/* * Linux VeeJay * * Copyright(C)2004 Niels Elburg * * 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 #include #include #include "rgbkey.h" #include #include "common.h" vj_effect *keyselect_init(int w, int h) { vj_effect *ve; ve = (vj_effect *) vj_calloc(sizeof(vj_effect)); ve->num_params = 6; 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->defaults[0] = 4500; /* angle */ ve->defaults[1] = 0; /* r */ ve->defaults[2] = 0; /* g */ ve->defaults[3] = 255; /* b */ ve->defaults[4] = 3; /* blend type */ ve->defaults[5] = 2400; /* noise suppression */ ve->limits[0][0] = 1; ve->limits[1][0] = 9000; ve->limits[0][1] = 0; ve->limits[1][1] = 255; ve->limits[0][2] = 0; ve->limits[1][2] = 255; ve->limits[0][3] = 0; ve->limits[1][3] = 255; ve->limits[0][4] = 0; ve->limits[1][4] = 7; ve->limits[0][5] = 0; ve->limits[1][5] = 5500; ve->has_user = 0; ve->parallel = 1; ve->description = "Blend by Color Key (RGB)"; ve->extra_frame = 1; ve->sub_format = 1; ve->rgb_conv = 1; ve->param_description = vje_build_param_list(ve->num_params, "Angle","Red","Green","Blue","Blend mode","Noise suppression" ); return ve; } typedef uint8_t(*blend_func)(uint8_t y1, uint8_t y2); blend_func get_blend_func(const int mode); uint8_t blend_func1(uint8_t a, uint8_t b) { return (uint8_t) 255 - (abs(255-a-b)); } uint8_t blend_func2(uint8_t a, uint8_t b) { uint8_t val; if( a == 0 ) a = 0xff; val = 255 - ((255-b) * (255-b))/a; return CLAMP_Y(val); } uint8_t blend_func3(uint8_t a , uint8_t b) { return (uint8_t) (a * b)>>8; } uint8_t blend_func4(uint8_t a, uint8_t b) { uint8_t c = 0xff - b; if( c == 0 ) return CLAMP_Y(c); return CLAMP_Y( (a*a)/c ); } uint8_t blend_func5(uint8_t a, uint8_t b) { uint8_t val; uint8_t c = 0xff - b; val = b / c; return CLAMP_Y(val); } uint8_t blend_func6(uint8_t a, uint8_t b) { uint8_t val = a + (2 * (b)) - 255; return CLAMP_Y(val); } uint8_t blend_func7(uint8_t a, uint8_t b) { return (uint8_t) ( a + ( b - 255) ); } uint8_t blend_func8(uint8_t a, uint8_t b) { int c; if(b < 128) c = (a * b) >> 7; else c = 255 - ((255-b)*(255-a)>>7); return CLAMP_Y(c); } blend_func get_blend_func(const int mode) { switch(mode) { case 0: return &blend_func1; case 1: return &blend_func2; case 2: return &blend_func3; case 3: return &blend_func4; case 4: return &blend_func5; case 5: return &blend_func6; case 6: return &blend_func7; case 7: return &blend_func8; } return &blend_func1; } /* http://www.cs.utah.edu/~michael/chroma/ */ void keyselect_apply( VJFrame *frame, VJFrame *frame2, int width, int height, int i_angle, int r, int g, int b, int mode, int i_noise) { uint8_t *fg_y, *fg_cb, *fg_cr; uint8_t *bg_y; int accept_angle_tg, accept_angle_ctg, one_over_kc; int kfgy_scale, kg; int cb, cr; int kbg, x1, y1; float kg1, tmp, aa = 255.0f, bb = 255.0f, _y = 0; float angle = (float) i_angle / 100.0f; float noise_level = (i_noise / 100.0f); unsigned int pos; uint8_t val, tmp1; uint8_t *Y = frame->data[0]; uint8_t *Cb= frame->data[1]; uint8_t *Cr= frame->data[2]; uint8_t *Y2 = frame2->data[0]; uint8_t *Cb2= frame2->data[1]; uint8_t *Cr2= frame2->data[2]; int iy=pixel_Y_lo_,iu=128,iv=128; _rgb2yuv( r,g,b, iy,iu,iv ); _y = (float) iy; aa = (float) iu; bb = (float) iv; tmp = sqrt(((aa * aa) + (bb * bb))); cb =255 * (aa / tmp); cr =255 * (bb / tmp); kg1 = tmp; blend_func blend_pixel = get_blend_func(mode); /* obtain coordinate system for cb / cr */ accept_angle_tg = 0xf * tan(M_PI * angle / 180.0); accept_angle_ctg = 0xf / tan(M_PI * angle / 180.0); tmp = 1 / kg1; one_over_kc = 0xff * 2 * tmp - 0xff; kfgy_scale = 0xf * (float) (_y) / kg1; kg = kg1; /* intialize pointers */ fg_y = Y; fg_cb = Cb; fg_cr = Cr; /* 2005: swap these !! */ bg_y = Y2; for (pos = (width * height); pos != 0; pos--) { short xx, yy; /* convert foreground to xz coordinates where x direction is defined by key color */ xx = (((fg_cb[pos]) * cb) + ((fg_cr[pos]) * cr)) >> 7; yy = (((fg_cr[pos]) * cb) - ((fg_cb[pos]) * cr)) >> 7; /* accept angle should not be > 90 degrees reasonable results between 10 and 80 degrees. */ val = (xx * accept_angle_tg) >> 4; if (abs(yy) < val) { /* compute fg, suppress fg in xz according to kfg */ val = (yy * accept_angle_ctg) >> 4; x1 = abs(val); y1 = yy; tmp1 = xx - x1; kbg = (tmp1 * one_over_kc) >> 1; val = (tmp1 * kfgy_scale) >> 4; val = fg_y[pos] - val; Y[pos] = val; // convert suppressed fg back to cbcr // cb,cr are signed, go back to unsigned ! val = ((x1 * cb) - (y1 * cr)) >> 7; Cb[pos] = val; val = ((x1 * cr) - (y1 * cb)) >> 7; Cr[pos] = val; // deal with noise val = (yy * yy) + (kg * kg); if (val < (noise_level * noise_level)) { kbg = 255; } val = (Y[pos] + (kbg * bg_y[pos])) >> 8; Y[pos] = blend_pixel( val, fg_y[pos] ); } } } void keyselect_free(){}