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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QPixmap>
#include <QWidget>
#include <QObject>
#include <QMainWindow>
#include <QPushButton>
#include <QComboBox>
#include <qaudioinput.h>
#define BUFFER_SIZE_LOG 9
#define BUFFER_SIZE (1 << BUFFER_SIZE_LOG)
struct _struct_fft_state {
float real[BUFFER_SIZE];
float imag[BUFFER_SIZE];
};
typedef _struct_fft_state fft_state;
typedef short int sound_sample;
class Spectrum : public QIODevice
{
Q_OBJECT
public:
Spectrum(QObject* parent, QAudioInput* device, float* out);
~Spectrum();
void start();
void stop();
qint64 readData(char *data, qint64 maxlen);
qint64 writeData(const char *data, qint64 len);
QAudioInput* input;
float* output;
fft_state* fftState;
unsigned int bitReverse[BUFFER_SIZE];
float sintable[BUFFER_SIZE / 2];
float costable[BUFFER_SIZE / 2];
void prepFFT (const sound_sample *input, float *re, float *im);
void calcFFT (float *re, float *im);
void outputFFT (const float *re, const float *im);
int reverseBits (unsigned int initial);
void performFFT (const sound_sample *input);
signals:
void update();
};
class RenderArea : public QWidget
{
Q_OBJECT
public:
RenderArea(QWidget *parent = 0);
void spectrum(float* output, int size);
protected:
void paintEvent(QPaintEvent *event);
private:
QPixmap pixmap;
float* samples;
int sampleSize;
};
class InputTest : public QMainWindow
{
Q_OBJECT
public:
InputTest();
~InputTest();
QAudioDeviceId device;
QAudioFormat format;
QAudioInput* audioInput;
Spectrum* spec;
QIODevice* input;
RenderArea* canvas;
bool pullMode;
QPushButton* button;
QPushButton* button2;
QComboBox* deviceBox;
char* buffer;
float* output;
private slots:
void refreshDisplay();
void status();
void readMore();
void toggleMode();
void toggleSuspend();
void state(QAudio::State s);
void deviceChanged(int idx);
};
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