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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include <qwidget.h>
#include "sound.h"
#include "fft.moc"
#include <X11/Xlib.h>
#define FFT_MAX 8192
#define FFT_LEFT 100
#define FFT_RIGHT 10000
/* soundfft.c */
extern int *BitReversed;
extern "C" void InitializeFFT(int fftlen);
extern "C" void EndFFT();
extern "C" void RealFFT(short *buffer);
/* ---------------------------------------------------------------------- */
FFTWindow::FFTWindow(QWidget *parent, char *name) : QWidget(parent,name,0)
{
XColor color,dummy;
Colormap map = DefaultColormapOfScreen
(DefaultScreenOfDisplay(x11Display()));
gc = XCreateGC(x11Display(),winId(),0,NULL);
XAllocNamedColor(x11Display(),map,"white",&color,&dummy);
back = color.pixel;
XAllocNamedColor(x11Display(),map,"red",&color,&dummy);
fore = color.pixel;
/* flag: no init so far... */
channels = 0;
logmap = NULL;
}
void
FFTWindow::make_logmap()
{
int i,w,h;
float freq,up;
w = width();
h = height();
if (!w || !h || !channels)
return;
if (logmap) {
free(logmap);
free(segments);
free(buffer);
EndFFT();
}
logmap = (int*) malloc((w+1)*sizeof(int));
segments = (XSegment*)malloc((w)*sizeof(XSegment));
buffer = (short*)malloc(fft_size*sizeof(short)*channels);
InitializeFFT(fft_size);
up = log(FFT_RIGHT/FFT_LEFT)/log(2);
for (i = 0; i <= w; i++) {
freq = pow(2,up*i/w)* FFT_LEFT;
logmap[i] = (int)(fft_size*freq/rate);
}
for (i = 0; i < w; i++) {
segments[i].x1 = i;
segments[i].x2 = i;
segments[i].y2 = h;
}
}
void
FFTWindow::calculate(unsigned char *data)
{
int i,j;
switch (afmt) {
case FMT_8BIT:
for (i = 0; i < audio_size; i++)
buffer[i] = (data[i] ^ 0x80) << 8;
break;
#if 0
case AFMT_S8:
for (i = 0; i < audio_size; i++)
buffer[i] = data[i] << 8;
break;
#endif
case FMT_16BIT:
memcpy(buffer,data,audio_size);
#if 0
/* byte swap */
for (i = 0; i < fft_size; i++)
buffer[i] =
((buffer[i] & 0xff00) >> 8) |
((buffer[i] & 0x00ff) << 8);
/* unsigned -> signed */
if (afmt == AFMT_U16_LE || afmt == AFMT_U16_BE)
for (i = 0; i < fft_size; i++)
buffer[i] ^= 0x8000;
#endif
break;
default:
fprintf(stderr,"oops(fft): unknown sound format\n");
exit(1);
}
for (i = 0, lmax = 0; i < fft_size; i++)
if ((j = abs((signed short)buffer[i])) > lmax)
lmax = j;
if (channels == 2) {
for (i = 0, j = 0; i < fft_size; i++, j+=2)
buffer[i] = (buffer[j]+buffer[j+1])>>1;
}
RealFFT(buffer);
}
void
FFTWindow::drawhist()
{
XGCValues gcval;
int re,im,ab;
int i,j,max,w,h;
int len = fft_size>>1;
w = width();
h = height();
for (i = 0; i < w; i++) {
max = 0;
j = logmap[i];
do {
if (j >= len)
break;
re = buffer[BitReversed[j]];
im = buffer[BitReversed[j]+1];
ab = re*re+im*im;
if (ab > max)
max = ab;
j++;
} while (j < logmap[i+1]);
max = (int)(sqrt(max) * h / FFT_MAX);
segments[i].y1 = h-max;
}
gcval.foreground = back;
XChangeGC(x11Display(),gc,GCForeground,&gcval);
XFillRectangle(x11Display(),winId(),gc,0,0,width(),height());
gcval.foreground = fore;
XChangeGC(x11Display(),gc,GCForeground,&gcval);
XDrawSegments(x11Display(),winId(),gc,segments,w);
max = height() - lmax*height()/32768;
XDrawLine(x11Display(),winId(),gc,0,max,width(),max);
}
/* ---------------------------------------------------------------------- */
void
FFTWindow::resizeEvent(QResizeEvent *event)
{
make_logmap();
}
void
FFTWindow::new_params(struct SOUNDPARAMS *p)
{
afmt = p->format;
channels = p->channels;
rate = p->rate;
audio_size = p->blocksize;
fft_size = audio_size/channels/2;
if (afmt != FMT_16BIT)
fft_size *= 2;
make_logmap();
}
void
FFTWindow::new_data(void *data)
{
if (!channels || !isVisible())
return;
calculate((unsigned char*)data);
drawhist();
}
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