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gstreamer/gst/synaesthesia/core.c
Andy Wingo f406b9f9c3 Initial revision 
Original commit message from CVS:
Initial revision
2001-12-22 23:26:48 +00:00

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/* Synaesthesia - program to display sound graphically
Copyright (C) 1997 Paul Francis Harrison
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.,
675 Mass Ave, Cambridge, MA 02139, USA.
The author may be contacted at:
pfh@yoyo.cc.monash.edu.au
or
27 Bond St., Mt. Waverley, 3149, Melbourne, Australia
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <core.h>
inline int bitReverser(int i) {
int sum=0,j;
for(j=0;j<SYNA_BITS;j++) {
sum = (i&1)+sum*2;
i >>= 1;
}
return sum;
}
static void fft(struct syna_priv *sp,double *x,double *y) {
int n2 = SYNA_SIZE, n1;
int twoToTheK;
int i,j;
for(twoToTheK=1;twoToTheK<SYNA_SIZE;twoToTheK*=2) {
n1 = n2;
n2 /= 2;
for(j=0;j<n2;j++) {
double c = sp->cosTable[j*twoToTheK&(SYNA_SIZE-1)],
s = sp->negSinTable[j*twoToTheK&(SYNA_SIZE-1)];
for(i=j;i<SYNA_SIZE;i+=n1) {
int l = i+n2;
double xt = x[i] - x[l];
double yt = y[i] - y[l];
x[i] = (x[i] + x[l]);
y[i] = (y[i] + y[l]);
x[l] = xt*c - yt*s;
y[l] = xt*s + yt*c;
}
}
}
}
void coreInit(struct syna_priv *sp,int w,int h) {
gint i;
for(i=0;i<SYNA_SIZE;i++) {
sp->negSinTable[i] = -sin(3.141592*2.0/SYNA_SIZE*i);
sp->cosTable[i] = cos(3.141592*2.0/SYNA_SIZE*i);
sp->bitReverse[i] = bitReverser(i);
}
sp->outWidth = w;
sp->outHeight = h;
sp->output = g_malloc(w*h);
sp->lastOutput = g_malloc(w*h);
sp->lastLastOutput = g_malloc(w*h);
memset(sp->output,0,w*h);
memset(sp->lastOutput,0,w*h);
memset(sp->lastLastOutput,0,w*h);
sp->fadeMode = FADE_STARS;
sp->pointsAreDiamonds = TRUE;
sp->brightnessTwiddler = 0.33;
sp->starSize = 0.125;
sp->fgRedSlider = 0.0;
sp->fgGreenSlider = 0.5;
sp->bgRedSlider = 1.0;
sp->bgGreenSlider = 0.2;
}
void setStarSize(struct syna_priv *sp,gdouble size) {
gdouble fadeModeFudge = (sp->fadeMode == FADE_WAVE ? 0.4 :
(sp->fadeMode == FADE_FLAME ? 0.6 : 0.78));
gint factor;
gint i;
if (size > 0.0)
factor = (int)(exp(log(fadeModeFudge) / (size*8.0))*255);
else
factor = 0;
if (factor > 255) factor = 255;
for(i=0;i<256;i++)
sp->scaleDown[i] = i*factor>>8;
sp->maxStarRadius = 1;
for(i=255;i;i = sp->scaleDown[i])
sp->maxStarRadius++;
}
inline void addPixel(struct syna_priv *sp,int x,int y,int br1,int br2)
{
unsigned char *p;
if (x < 0 || x >= sp->outWidth || y < 0 || y >= sp->outHeight) return;
p = sp->output+x*2+y*sp->outWidth*2;
if (p[0] < 255-br1) p[0] += br1; else p[0] = 255;
if (p[1] < 255-br2) p[1] += br2; else p[1] = 255;
}
inline void addPixelFast(unsigned char *p,int br1,int br2) {
if (p[0] < 255-br1) p[0] += br1; else p[0] = 255;
if (p[1] < 255-br2) p[1] += br2; else p[1] = 255;
}
void fadeFade(struct syna_priv *sp) {
register unsigned long *ptr = (unsigned long*)sp->output;
int i = sp->outWidth*sp->outHeight*2/4;
do {
if (*ptr)
*(ptr++) -= ((*ptr & 0xf0f0f0f0ul) >> 4) + ((*ptr & 0xe0e0e0e0ul) >> 5);
else
ptr++;
} while(--i > 0);
}
inline unsigned char getPixel(struct syna_priv *sp,int x,int y,int where) {
if (x < 0 || y < 0 || x >= sp->outWidth || y >= sp->outHeight) return 0;
return sp->lastOutput[where];
}
inline void fadePixelWave(struct syna_priv *sp,int x,int y,int where,int step) {
short j =
(short)((getPixel(sp,x-1,y,where-2)+
getPixel(sp,x+1,y,where+2)+
getPixel(sp,x,y-1,where-step)+
getPixel(sp,x,y+1,where+step)) >> 2)
+ sp->lastOutput[where];
if (!j) { sp->output[where] = 0; return; }
j = j - sp->lastLastOutput[where] - 1;
if (j < 0) sp->output[where] = 0;
else if (j & (255*256)) sp->output[where] = 255;
else sp->output[where] = j;
}
void fadeWave(struct syna_priv *sp) {
int x,y,i,j,start,end;
int step = sp->outWidth*2;
unsigned char *t = sp->lastLastOutput;
sp->lastLastOutput = sp->lastOutput;
sp->lastOutput = sp->output;
sp->output = t;
for(x=0,i=0,j=sp->outWidth*(sp->outHeight-1)*2;x<sp->outWidth;x++,i+=2,j+=2) {
fadePixelWave(sp,x,0,i,step);
fadePixelWave(sp,x,0,i+1,step);
fadePixelWave(sp,x,sp->outHeight-1,j,step);
fadePixelWave(sp,x,sp->outHeight-1,j+1,step);
}
for(y=1,i=sp->outWidth*2,j=sp->outWidth*4-2;y<sp->outHeight;y++,i+=step,j+=step) {
fadePixelWave(sp,0,y,i,step);
fadePixelWave(sp,0,y,i+1,step);
fadePixelWave(sp,sp->outWidth-1,y,j,step);
fadePixelWave(sp,sp->outWidth-1,y,j+1,step);
}
for(y=1,
start=sp->outWidth*2+2,
end=sp->outWidth*4-2; y<sp->outHeight-1; y++,start+=step,end+=step) {
int i = start;
do {
short j =
(short)((sp->lastOutput[i-2]+
sp->lastOutput[i+2]+
sp->lastOutput[i-step]+
sp->lastOutput[i+step]) >> 2)
+ sp->lastOutput[i];
if (!j) {
sp->output[i] = 0;
} else {
j = j - sp->lastLastOutput[i] - 1;
if (j < 0) sp->output[i] = 0;
else if (j & (255*256)) sp->output[i] = 255;
else sp->output[i] = j;
}
} while(++i < end);
}
}
inline void fadePixelHeat(struct syna_priv *sp,int x,int y,int where,int step) {
short j =
(short)((getPixel(sp,x-1,y,where-2)+
getPixel(sp,x+1,y,where+2)+
getPixel(sp,x,y-1,where-step)+
getPixel(sp,x,y+1,where+step)) >> 2)
+ sp->lastOutput[where];
if (!j) { sp->output[where] = 0; return; }
j = j - sp->lastLastOutput[where] - 1;
if (j < 0) sp->output[where] = 0;
else if (j & (255*256)) sp->output[where] = 255;
else sp->output[where] = j;
}
void fadeHeat(struct syna_priv *sp) {
int x,y,i,j,start,end;
int step = sp->outWidth*2;
unsigned char *t = sp->lastLastOutput;
sp->lastLastOutput = sp->lastOutput;
sp->lastOutput = sp->output;
sp->output = t;
for(x=0,i=0,j=sp->outWidth*(sp->outHeight-1)*2;x<sp->outWidth;x++,i+=2,j+=2) {
fadePixelHeat(sp,x,0,i,step);
fadePixelHeat(sp,x,0,i+1,step);
fadePixelHeat(sp,x,sp->outHeight-1,j,step);
fadePixelHeat(sp,x,sp->outHeight-1,j+1,step);
}
for(y=1,i=sp->outWidth*2,j=sp->outWidth*4-2;y<sp->outHeight;y++,i+=step,j+=step) {
fadePixelHeat(sp,0,y,i,step);
fadePixelHeat(sp,0,y,i+1,step);
fadePixelHeat(sp,sp->outWidth-1,y,j,step);
fadePixelHeat(sp,sp->outWidth-1,y,j+1,step);
}
for (y=1,start=sp->outWidth*2+2,
end=sp->outWidth*4-2; y<sp->outHeight-1; y++,start+=step,end+=step) {
int i = start;
do {
short j =
(short)((sp->lastOutput[i-2]+
sp->lastOutput[i+2]+
sp->lastOutput[i-step]+
sp->lastOutput[i+step]) >> 2)
+ sp->lastOutput[i];
if (!j) {
sp->output[i] = 0;
} else {
j = j - sp->lastLastOutput[i] +
(sp->lastLastOutput[i] - ((sp->lastOutput[i])>>2)) - 1;
if (j < 0) sp->output[i] = 0;
else if (j & (255*256)) sp->output[i] = 255;
else sp->output[i] = j;
}
} while(++i < end);
}
}
void fade(struct syna_priv *sp) {
switch(sp->fadeMode) {
case FADE_STARS :
fadeFade(sp);
break;
case FADE_FLAME :
fadeHeat(sp);
break;
case FADE_WAVE :
fadeWave(sp);
break;
default:
break;
}
}
int coreGo(struct syna_priv *sp,guchar *data,gint len) {
double x[SYNA_SIZE], y[SYNA_SIZE];
double a[SYNA_SIZE], b[SYNA_SIZE];
int clarity[SYNA_SIZE]; //Surround sound
int i,j,k;
int heightFactor = SYNA_SIZE / 2 / sp->outHeight + 1;
int actualHeight = SYNA_SIZE / 2 / heightFactor;
int heightAdd = sp->outHeight + (actualHeight >> 1);
int brightFactor = (int)(150 * sp->brightnessTwiddler / (sp->starSize+0.01));
double brightFactor2;
for(i=0;i<SYNA_SIZE;i++) {
x[i] = data[i*2];
y[i] = data[i*2+1];
}
fft(sp,x,y);
for(i=0 +1;i<SYNA_SIZE;i++) {
double x1 = x[sp->bitReverse[i]],
y1 = y[sp->bitReverse[i]],
x2 = x[sp->bitReverse[SYNA_SIZE-i]],
y2 = y[sp->bitReverse[SYNA_SIZE-i]],
aa,bb;
a[i] = sqrt(aa= (x1+x2)*(x1+x2) + (y1-y2)*(y1-y2) );
b[i] = sqrt(bb= (x1-x2)*(x1-x2) + (y1+y2)*(y1+y2) );
if (aa+bb != 0.0)
clarity[i] = (int)(
( (x1+x2) * (x1-x2) + (y1+y2) * (y1-y2) )/(aa+bb) * 256 );
else
clarity[i] = 0;
}
/* Correct for window size */
brightFactor2 = (brightFactor/65536.0/SYNA_SIZE)*
sqrt(actualHeight*sp->outWidth/(320.0*200.0));
for(i=1;i<SYNA_SIZE/2;i++) {
if (a[i] > 0 || b[i] > 0) {
int h = (int)( b[i]*sp->outWidth / (a[i]+b[i]) );
int br1, br2, br = (int)(
(a[i]+b[i])*i*brightFactor2 );
int px = h,
py = heightAdd - i / heightFactor;
br1 = br*(clarity[i]+128)>>8;
br2 = br*(128-clarity[i])>>8;
if (br1 < 0) br1 = 0; else if (br1 > 255) br1 = 255;
if (br2 < 0) br2 = 0; else if (br2 > 255) br2 = 255;
if (sp->pointsAreDiamonds) {
addPixel(sp,px,py,br1,br2);
br1=sp->scaleDown[br1];br2=sp->scaleDown[br2];
//TODO: Use addpixelfast
for(j=1;br1>0||br2>0;j++,br1=sp->scaleDown[br1],
br2=sp->scaleDown[br2]) {
for(k=0;k<j;k++) {
addPixel(sp,px-j+k,py-k,br1,br2);
addPixel(sp,px+k,py-j+k,br1,br2);
addPixel(sp,px+j-k,py+k,br1,br2);
addPixel(sp,px-k,py+j-k,br1,br2);
}
}
} else {
if (px < sp->maxStarRadius || py < sp->maxStarRadius ||
px > sp->outWidth-sp->maxStarRadius ||
py > sp->outHeight-sp->maxStarRadius) {
addPixel(sp,px,py,br1,br2);
for (j=1;(br1>0) || (br2>0);j++,br1=sp->scaleDown[br1],
br2=sp->scaleDown[br2]) {
addPixel(sp,px+j,py,br1,br2);
addPixel(sp,px,py+j,br1,br2);
addPixel(sp,px-j,py,br1,br2);
addPixel(sp,px,py-j,br1,br2);
}
} else {
unsigned char *p = sp->output+px*2+py*sp->outWidth*2;
unsigned char *p1=p, *p2=p, *p3=p, *p4=p;
addPixelFast(p,br1,br2);
for(;br1>0||br2>0;br1=sp->scaleDown[br1],br2=sp->scaleDown[br2]) {
p1 += 2;
addPixelFast(p1,br1,br2);
p2 -= 2;
addPixelFast(p2,br1,br2);
p3 += sp->outWidth*2;
addPixelFast(p3,br1,br2);
p4 -= sp->outWidth*2;
addPixelFast(p4,br1,br2);
}
}
}
}
}
return 0;
}
void setupPalette(struct syna_priv *sp,guchar *palette) {
#define BOUND(x) ((x) > 255 ? 255 : (x))
#define PEAKIFY(x) (int)(BOUND((x) - (x)*(255-(x))/255/2))
#ifndef MAX
#define MAX(x,y) ((x) > (y) ? (x) : (y))
#endif /* MAX */
int i,f,b;
double scale, fgRed, fgGreen, fgBlue, bgRed, bgGreen, bgBlue;
fgRed = sp->fgRedSlider;
fgGreen = sp->fgGreenSlider;
fgBlue = 1.0 - MAX(fgRed,fgGreen);
scale = MAX(MAX(fgRed,fgGreen),fgBlue);
fgRed /= scale;
fgGreen /= scale;
fgBlue /= scale;
bgRed = sp->bgRedSlider;
bgGreen = sp->bgGreenSlider;
bgBlue = 1.0 - MAX(sp->bgRedSlider,sp->bgGreenSlider);
scale = MAX(MAX(bgRed,bgGreen),bgBlue);
bgRed /= scale;
bgGreen /= scale;
bgBlue /= scale;
for(i=0;i<256;i++) {
f = i&15;
b = i/16;
palette[i*4+0] = PEAKIFY(b*bgRed*16+f*fgRed*16);
palette[i*4+1] = PEAKIFY(b*bgGreen*16+f*fgGreen*16);
palette[i*4+2] = PEAKIFY(b*bgBlue*16+f*fgBlue*16);
}
}
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