/****************************************************************************

**

** Copyright (C) 2010 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.

**

** $QT_BEGIN_LICENSE:BSD$

** You may use this file under the terms of the BSD license as follows:

**

**

** $QT_END_LICENSE$

**

#ifndef SPECTRUM_H

#define SPECTRUM_H

#include <QtCore/qglobal.h>

#include "utils.h"

#include "fftreal_wrapper.h" // For FFTLengthPowerOfTwo

//-----------------------------------------------------------------------------

// Constants

//-----------------------------------------------------------------------------

// Number of audio samples used to calculate the frequency spectrum

const int    SpectrumLengthSamples  = PowerOfTwo<FFTLengthPowerOfTwo>::Result;

// Number of bands in the frequency spectrum

const int    SpectrumNumBands       = 10;

// Lower bound of first band in the spectrum

const qreal  SpectrumLowFreq        = 0.0; // Hz

// Upper band of last band in the spectrum

const qreal  SpectrumHighFreq       = 1000.0; // Hz

// Waveform window size in microseconds

const qint64 WaveformWindowDuration = 500 * 1000;

// Length of waveform tiles in bytes

// Ideally, these would match the QAudio*::bufferSize(), but that isn't

// available until some time after QAudio*::start() has been called, and we

// need this value in order to initialize the waveform display.

// We therefore just choose a sensible value.

const int   WaveformTileLength      = 4096;

// Fudge factor used to calculate the spectrum bar heights

const qreal SpectrumAnalyserMultiplier = 0.15;

// Disable message timeout

const int   NullMessageTimeout      = -1;

//-----------------------------------------------------------------------------

// Types and data structures

//-----------------------------------------------------------------------------

enum WindowFunction {

    NoWindow,

    HannWindow

};

const WindowFunction DefaultWindowFunction = HannWindow;

struct Tone {

    Tone(qreal freq = 0.0, qreal amp = 0.0)

    :   frequency(freq), amplitude(amp)

    { }

    // Start and end frequencies for swept tone generation

    qreal   frequency;

    // Amplitude in range [0.0, 1.0]

    qreal   amplitude;

};

struct SweptTone {

    SweptTone(qreal start = 0.0, qreal end = 0.0, qreal amp = 0.0)

    :   startFreq(start), endFreq(end), amplitude(amp)

    { Q_ASSERT(end >= start); }

    SweptTone(const Tone &tone)

    :   startFreq(tone.frequency), endFreq(tone.frequency), amplitude(tone.amplitude)

    { }

    // Start and end frequencies for swept tone generation

    qreal   startFreq;

    qreal   endFreq;

    // Amplitude in range [0.0, 1.0]

    qreal   amplitude;

};

//-----------------------------------------------------------------------------

// Macros

//-----------------------------------------------------------------------------

// Macro which connects a signal to a slot, and which causes application to

// abort if the connection fails.  This is intended to catch programming errors

// such as mis-typing a signal or slot name.  It is necessary to write our own

// macro to do this - the following idiom

//     Q_ASSERT(connect(source, signal, receiver, slot));

// will not work because Q_ASSERT compiles to a no-op in release builds.

#define CHECKED_CONNECT(source, signal, receiver, slot) \

    if(!connect(source, signal, receiver, slot)) \

        qt_assert_x(Q_FUNC_INFO, "CHECKED_CONNECT failed", __FILE__, __LINE__);

// Handle some dependencies between macros defined in the .pro file

#ifdef DISABLE_WAVEFORM

#undef SUPERIMPOSE_PROGRESS_ON_WAVEFORM

#endif

#endif // SPECTRUM_H