518 lines
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HTML
518 lines
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<h1 class="title">engine.h Example File</h1>
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<span class="small-subtitle">demos/spectrum/app/engine.h</span>
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<!-- $$$demos/spectrum/app/engine.h-description -->
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<div class="descr"> <a name="details"></a>
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<pre class="cpp"> <span class="comment">/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/</span>
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<span class="preprocessor">#ifndef ENGINE_H</span>
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<span class="preprocessor">#define ENGINE_H</span>
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<span class="preprocessor">#include "spectrum.h"</span>
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<span class="preprocessor">#include "spectrumanalyser.h"</span>
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<span class="preprocessor">#include "wavfile.h"</span>
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<span class="preprocessor">#include <QObject></span>
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<span class="preprocessor">#include <QByteArray></span>
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<span class="preprocessor">#include <QBuffer></span>
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<span class="preprocessor">#include <QVector></span>
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<span class="preprocessor">#include <QtMultimedia/QAudioDeviceInfo></span>
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<span class="preprocessor">#include <QtMultimedia/QAudioFormat></span>
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<span class="preprocessor">#ifdef DUMP_CAPTURED_AUDIO</span>
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<span class="preprocessor">#define DUMP_DATA</span>
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<span class="preprocessor">#endif</span>
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<span class="preprocessor">#ifdef DUMP_SPECTRUM</span>
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<span class="preprocessor">#define DUMP_DATA</span>
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<span class="preprocessor">#endif</span>
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<span class="preprocessor">#ifdef DUMP_DATA</span>
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<span class="preprocessor">#include <QDir></span>
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<span class="preprocessor">#endif</span>
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<span class="keyword">class</span> FrequencySpectrum;
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QT_FORWARD_DECLARE_CLASS(<span class="type"><a href="qaudioinput.html">QAudioInput</a></span>)
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QT_FORWARD_DECLARE_CLASS(<span class="type"><a href="qaudiooutput.html">QAudioOutput</a></span>)
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QT_FORWARD_DECLARE_CLASS(<span class="type"><a href="qfile.html">QFile</a></span>)
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<span class="comment">/**
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* This class interfaces with the QtMultimedia audio classes, and also with
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* the SpectrumAnalyser class. Its role is to manage the capture and playback
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* of audio data, meanwhile performing real-time analysis of the audio level
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* and frequency spectrum.
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*/</span>
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<span class="keyword">class</span> Engine : <span class="keyword">public</span> <span class="type"><a href="qobject.html">QObject</a></span> {
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Q_OBJECT
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<span class="keyword">public</span>:
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Engine(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>);
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<span class="operator">~</span>Engine();
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<span class="keyword">const</span> <span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">></span><span class="operator">&</span> availableAudioInputDevices() <span class="keyword">const</span>
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{ <span class="keyword">return</span> m_availableAudioInputDevices; }
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<span class="keyword">const</span> <span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">></span><span class="operator">&</span> availableAudioOutputDevices() <span class="keyword">const</span>
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{ <span class="keyword">return</span> m_availableAudioOutputDevices; }
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<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>Mode mode() <span class="keyword">const</span> { <span class="keyword">return</span> m_mode; }
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<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State state() <span class="keyword">const</span> { <span class="keyword">return</span> m_state; }
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<span class="comment">/**
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* \return Current audio format
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* \note May be QAudioFormat() if engine is not initialized
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*/</span>
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<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">&</span> format() <span class="keyword">const</span> { <span class="keyword">return</span> m_format; }
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<span class="comment">/**
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* Stop any ongoing recording or playback, and reset to ground state.
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*/</span>
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<span class="type">void</span> reset();
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<span class="comment">/**
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* Load data from WAV file
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*/</span>
|
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<span class="type">bool</span> loadFile(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>fileName);
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|
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<span class="comment">/**
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* Generate tone
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*/</span>
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<span class="type">bool</span> generateTone(<span class="keyword">const</span> Tone <span class="operator">&</span>tone);
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|
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<span class="comment">/**
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* Generate tone
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*/</span>
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<span class="type">bool</span> generateSweptTone(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> amplitude);
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<span class="comment">/**
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* Initialize for recording
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*/</span>
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<span class="type">bool</span> initializeRecord();
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<span class="comment">/**
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* Position of the audio input device.
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* \return Position in bytes.
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*/</span>
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<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> recordPosition() <span class="keyword">const</span> { <span class="keyword">return</span> m_recordPosition; }
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<span class="comment">/**
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* RMS level of the most recently processed set of audio samples.
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* \return Level in range (0.0, 1.0)
|
|
*/</span>
|
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<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> rmsLevel() <span class="keyword">const</span> { <span class="keyword">return</span> m_rmsLevel; }
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|
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<span class="comment">/**
|
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* Peak level of the most recently processed set of audio samples.
|
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* \return Level in range (0.0, 1.0)
|
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*/</span>
|
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<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> peakLevel() <span class="keyword">const</span> { <span class="keyword">return</span> m_peakLevel; }
|
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|
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<span class="comment">/**
|
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* Position of the audio output device.
|
|
* \return Position in bytes.
|
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*/</span>
|
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<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> playPosition() <span class="keyword">const</span> { <span class="keyword">return</span> m_playPosition; }
|
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|
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<span class="comment">/**
|
|
* Length of the internal engine buffer.
|
|
* \return Buffer length in bytes.
|
|
*/</span>
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> bufferLength() <span class="keyword">const</span>;
|
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|
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<span class="comment">/**
|
|
* Amount of data held in the buffer.
|
|
* \return Data length in bytes.
|
|
*/</span>
|
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<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> dataLength() <span class="keyword">const</span> { <span class="keyword">return</span> m_dataLength; }
|
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|
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<span class="comment">/**
|
|
* Set window function applied to audio data before spectral analysis.
|
|
*/</span>
|
|
<span class="type">void</span> setWindowFunction(WindowFunction type);
|
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|
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<span class="keyword">public</span> <span class="keyword">slots</span>:
|
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<span class="type">void</span> startRecording();
|
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<span class="type">void</span> startPlayback();
|
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<span class="type">void</span> suspend();
|
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<span class="type">void</span> setAudioInputDevice(<span class="keyword">const</span> <span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span> <span class="operator">&</span>device);
|
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<span class="type">void</span> setAudioOutputDevice(<span class="keyword">const</span> <span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span> <span class="operator">&</span>device);
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|
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<span class="keyword">signals</span>:
|
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<span class="type">void</span> stateChanged(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>Mode mode<span class="operator">,</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State state);
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|
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<span class="comment">/**
|
|
* Informational message for non-modal display
|
|
*/</span>
|
|
<span class="type">void</span> infoMessage(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>message<span class="operator">,</span> <span class="type">int</span> durationMs);
|
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|
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<span class="comment">/**
|
|
* Error message for modal display
|
|
*/</span>
|
|
<span class="type">void</span> errorMessage(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>heading<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>detail);
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|
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<span class="comment">/**
|
|
* Format of audio data has changed
|
|
*/</span>
|
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<span class="type">void</span> formatChanged(<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> <span class="operator">&</span>format);
|
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|
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<span class="comment">/**
|
|
* Length of buffer has changed.
|
|
* \param duration Duration in microseconds
|
|
*/</span>
|
|
<span class="type">void</span> bufferLengthChanged(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> duration);
|
|
|
|
<span class="comment">/**
|
|
* Amount of data in buffer has changed.
|
|
* \param Length of data in bytes
|
|
*/</span>
|
|
<span class="type">void</span> dataLengthChanged(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> duration);
|
|
|
|
<span class="comment">/**
|
|
* Position of the audio input device has changed.
|
|
* \param position Position in bytes
|
|
*/</span>
|
|
<span class="type">void</span> recordPositionChanged(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position);
|
|
|
|
<span class="comment">/**
|
|
* Position of the audio output device has changed.
|
|
* \param position Position in bytes
|
|
*/</span>
|
|
<span class="type">void</span> playPositionChanged(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position);
|
|
|
|
<span class="comment">/**
|
|
* Level changed
|
|
* \param rmsLevel RMS level in range 0.0 - 1.0
|
|
* \param peakLevel Peak level in range 0.0 - 1.0
|
|
* \param numSamples Number of audio samples analyzed
|
|
*/</span>
|
|
<span class="type">void</span> levelChanged(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> rmsLevel<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> peakLevel<span class="operator">,</span> <span class="type">int</span> numSamples);
|
|
|
|
<span class="comment">/**
|
|
* Spectrum has changed.
|
|
* \param position Position of start of window in bytes
|
|
* \param length Length of window in bytes
|
|
* \param spectrum Resulting frequency spectrum
|
|
*/</span>
|
|
<span class="type">void</span> spectrumChanged(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> length<span class="operator">,</span> <span class="keyword">const</span> FrequencySpectrum <span class="operator">&</span>spectrum);
|
|
|
|
<span class="comment">/**
|
|
* Buffer containing audio data has changed.
|
|
* \param position Position of start of buffer in bytes
|
|
* \param buffer Buffer
|
|
*/</span>
|
|
<span class="type">void</span> bufferChanged(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> length<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span> <span class="operator">&</span>buffer);
|
|
|
|
<span class="keyword">private</span> <span class="keyword">slots</span>:
|
|
<span class="type">void</span> audioNotify();
|
|
<span class="type">void</span> audioStateChanged(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State state);
|
|
<span class="type">void</span> audioDataReady();
|
|
<span class="type">void</span> spectrumChanged(<span class="keyword">const</span> FrequencySpectrum <span class="operator">&</span>spectrum);
|
|
|
|
<span class="keyword">private</span>:
|
|
<span class="type">void</span> resetAudioDevices();
|
|
<span class="type">bool</span> initialize();
|
|
<span class="type">bool</span> selectFormat();
|
|
<span class="type">void</span> stopRecording();
|
|
<span class="type">void</span> stopPlayback();
|
|
<span class="type">void</span> setState(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State state);
|
|
<span class="type">void</span> setState(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>Mode mode<span class="operator">,</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State state);
|
|
<span class="type">void</span> setFormat(<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> <span class="operator">&</span>format);
|
|
<span class="type">void</span> setRecordPosition(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position<span class="operator">,</span> <span class="type">bool</span> forceEmit <span class="operator">=</span> <span class="keyword">false</span>);
|
|
<span class="type">void</span> setPlayPosition(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position<span class="operator">,</span> <span class="type">bool</span> forceEmit <span class="operator">=</span> <span class="keyword">false</span>);
|
|
<span class="type">void</span> calculateLevel(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> length);
|
|
<span class="type">void</span> calculateSpectrum(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position);
|
|
<span class="type">void</span> setLevel(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> rmsLevel<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> peakLevel<span class="operator">,</span> <span class="type">int</span> numSamples);
|
|
|
|
<span class="preprocessor">#ifdef DUMP_DATA</span>
|
|
<span class="type">void</span> createOutputDir();
|
|
<span class="type"><a href="qstring.html">QString</a></span> outputPath() <span class="keyword">const</span> { <span class="keyword">return</span> m_outputDir<span class="operator">.</span>path(); }
|
|
<span class="preprocessor">#endif</span>
|
|
|
|
<span class="preprocessor">#ifdef DUMP_CAPTURED_AUDIO</span>
|
|
<span class="type">void</span> dumpData();
|
|
<span class="preprocessor">#endif</span>
|
|
|
|
<span class="keyword">private</span>:
|
|
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>Mode m_mode;
|
|
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State m_state;
|
|
|
|
<span class="type">bool</span> m_generateTone;
|
|
SweptTone m_tone;
|
|
|
|
WavFile<span class="operator">*</span> m_file;
|
|
<span class="comment">// We need a second file handle via which to read data into m_buffer</span>
|
|
<span class="comment">// for analysis</span>
|
|
WavFile<span class="operator">*</span> m_analysisFile;
|
|
|
|
<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> m_format;
|
|
|
|
<span class="keyword">const</span> <span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">></span> m_availableAudioInputDevices;
|
|
<span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span> m_audioInputDevice;
|
|
<span class="type"><a href="qaudioinput.html">QAudioInput</a></span><span class="operator">*</span> m_audioInput;
|
|
<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">*</span> m_audioInputIODevice;
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_recordPosition;
|
|
|
|
<span class="keyword">const</span> <span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">></span> m_availableAudioOutputDevices;
|
|
<span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span> m_audioOutputDevice;
|
|
<span class="type"><a href="qaudiooutput.html">QAudioOutput</a></span><span class="operator">*</span> m_audioOutput;
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_playPosition;
|
|
<span class="type"><a href="qbuffer.html">QBuffer</a></span> m_audioOutputIODevice;
|
|
|
|
<span class="type"><a href="qbytearray.html">QByteArray</a></span> m_buffer;
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_bufferPosition;
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_bufferLength;
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_dataLength;
|
|
|
|
<span class="type">int</span> m_levelBufferLength;
|
|
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> m_rmsLevel;
|
|
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> m_peakLevel;
|
|
|
|
<span class="type">int</span> m_spectrumBufferLength;
|
|
<span class="type"><a href="qbytearray.html">QByteArray</a></span> m_spectrumBuffer;
|
|
SpectrumAnalyser m_spectrumAnalyser;
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_spectrumPosition;
|
|
|
|
<span class="type">int</span> m_count;
|
|
|
|
<span class="preprocessor">#ifdef DUMP_DATA</span>
|
|
<span class="type"><a href="qdir.html">QDir</a></span> m_outputDir;
|
|
<span class="preprocessor">#endif</span>
|
|
|
|
};
|
|
|
|
<span class="preprocessor">#endif // ENGINE_H</span></pre>
|
|
</div>
|
|
<!-- @@@demos/spectrum/app/engine.h -->
|
|
</div>
|
|
</div>
|
|
</div>
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<div class="ft">
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<span></span>
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</div>
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</div>
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<p>
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<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
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Documentation contributions included herein are the copyrights of
|
|
their respective owners.</p>
|
|
<br />
|
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<p>
|
|
The documentation provided herein is licensed under the terms of the
|
|
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
|
|
License version 1.3</a> as published by the Free Software Foundation.</p>
|
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<p>
|
|
Documentation sources may be obtained from <a href="http://www.qt-project.org">
|
|
www.qt-project.org</a>.</p>
|
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<br />
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<p>
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Qt and respective logos are trademarks of The Qt Company Ltd
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in Finland and/or other countries worldwide. All other trademarks are property
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of their respective owners. <a title="Privacy Policy"
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href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
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