beatgraph-analyzer.cpp File Reference

#include <cstdio>
#include <Qt/qapplication.h>
#include <Qt/qlineedit.h>
#include <Qt/qpixmap.h>
#include <Qt/qpainter.h>
#include <Qt/qpushbutton.h>
#include <Qt/qlcdnumber.h>
#include <Qt/qcheckbox.h>
#include <Qt/qlabel.h>
#include <Qt/qprogressbar.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <libgen.h>
#include <Qt/qprogressdialog.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <Qt/qspinbox.h>
#include <unistd.h>
#include <Qt/qcombobox.h>
#include <Qt/qslider.h>
#include <time.h>
#include <sys/times.h>
#include <math.h>
#include <assert.h>
#include <sys/mman.h>
#include <Qt/qmessagebox.h>
#include <set>
#include "beatgraph-label.h"
#include "beatgraph-analyzer.h"
#include "rhythm-analyzer.h"
#include "bpmplay.h"
#include "version.h"
#include "scripts.h"
#include "memory.h"
#include "signals.h"
#include "clock-drivers.h"
#include "hues.h"
#include "info.h"

Include dependency graph for beatgraph-analyzer.cpp:

Defines
#define	COLLAPSE   4
Functions
void	getBandColor (int band, QColor &color, float4 val)
void	channel_to_energy (unsigned4 ws, unsigned4 n, void *D, unsigned4 stride)
Variables
const int	maxslice = 8

---

Define Documentation

#define COLLAPSE   4

---

Function Documentation

void channel_to_energy	(	unsigned4	ws,
		unsigned4	n,
		void *	D,
		unsigned4	stride
	)

ws = the window size over which we calculate the rms value n = the length of the input and output channels data = the start of the input and output channel (This is an in-place transform) stride = how to go from one sample to the next. 1 is a standard array. 2 will skip 1

This function does what I hate in biological data analysis. It THRESHOLDS. The horror but it works quite well. I would never do this if it had not to do with the speed of computation. Whoever reads this: please forgive me for this random collection of thresholds. Well.... They are not that random. The mean is move to 0 and then the average distance to the mean is used to reposition the mean.

A second disaster with this function is that it receives an area and treats it as signed4 integers and then write the result back as if it were unsigned4 !

First we convert the signed integers to unsigned integers that can be added ws times and we also square them already

To normalize the signal here we tested a number of different approaches subtraction of the mean; division by the mean and log(v/me) there was not much qualitative difference between subtraction and log, except that we had gray faster than with subtraction. Division underperformed v/=me; // division method v=log(v/me); // log method

References assert(), and target.

void getBandColor	(	int	band,
		QColor &	color,
		float4	val
	)

References maxslice.

---

Variable Documentation

const int maxslice = 8

Referenced by getBandColor().