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<h1 class="title">audiooutput.cpp Example File</h1>
<span class="small-subtitle">multimedia/audiooutput/audiooutput.cpp</span>
<!-- $$$multimedia/audiooutput/audiooutput.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** 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:
**
** &quot;Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QDebug&gt;</span>
<span class="preprocessor">#include &lt;QVBoxLayout&gt;</span>
<span class="preprocessor">#include &lt;QAudioOutput&gt;</span>
<span class="preprocessor">#include &lt;QAudioDeviceInfo&gt;</span>
<span class="preprocessor">#include &lt;QtCore/qmath.h&gt;</span>
<span class="preprocessor">#include &lt;QtCore/qendian.h&gt;</span>
<span class="preprocessor">#include &quot;audiooutput.h&quot;</span>
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> AudioTest<span class="operator">::</span>PushModeLabel(tr(<span class="string">&quot;Enable push mode&quot;</span>));
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> AudioTest<span class="operator">::</span>PullModeLabel(tr(<span class="string">&quot;Enable pull mode&quot;</span>));
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> AudioTest<span class="operator">::</span>SuspendLabel(tr(<span class="string">&quot;Suspend playback&quot;</span>));
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> AudioTest<span class="operator">::</span>ResumeLabel(tr(<span class="string">&quot;Resume playback&quot;</span>));
<span class="keyword">const</span> <span class="type">int</span> DurationSeconds <span class="operator">=</span> <span class="number">1</span>;
<span class="keyword">const</span> <span class="type">int</span> ToneFrequencyHz <span class="operator">=</span> <span class="number">600</span>;
<span class="keyword">const</span> <span class="type">int</span> DataFrequencyHz <span class="operator">=</span> <span class="number">44100</span>;
<span class="keyword">const</span> <span class="type">int</span> BufferSize <span class="operator">=</span> <span class="number">32768</span>;
Generator<span class="operator">::</span>Generator(<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> <span class="operator">&amp;</span>format<span class="operator">,</span>
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> durationUs<span class="operator">,</span>
<span class="type">int</span> frequency<span class="operator">,</span>
<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qiodevice.html">QIODevice</a></span>(parent)
<span class="operator">,</span> m_pos(<span class="number">0</span>)
{
generateData(format<span class="operator">,</span> durationUs<span class="operator">,</span> frequency);
}
Generator<span class="operator">::</span><span class="operator">~</span>Generator()
{
}
<span class="type">void</span> Generator<span class="operator">::</span>start()
{
open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly);
}
<span class="type">void</span> Generator<span class="operator">::</span>stop()
{
m_pos <span class="operator">=</span> <span class="number">0</span>;
close();
}
<span class="type">void</span> Generator<span class="operator">::</span>generateData(<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> <span class="operator">&amp;</span>format<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> durationUs<span class="operator">,</span> <span class="type">int</span> frequency)
{
<span class="keyword">const</span> <span class="type">int</span> channelBytes <span class="operator">=</span> format<span class="operator">.</span>sampleSize() <span class="operator">/</span> <span class="number">8</span>;
<span class="keyword">const</span> <span class="type">int</span> sampleBytes <span class="operator">=</span> format<span class="operator">.</span>channels() <span class="operator">*</span> channelBytes;
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> length <span class="operator">=</span> (format<span class="operator">.</span>frequency() <span class="operator">*</span> format<span class="operator">.</span>channels() <span class="operator">*</span> (format<span class="operator">.</span>sampleSize() <span class="operator">/</span> <span class="number">8</span>))
<span class="operator">*</span> durationUs <span class="operator">/</span> <span class="number">100000</span>;
Q_ASSERT(length <span class="operator">%</span> sampleBytes <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>);
Q_UNUSED(sampleBytes) <span class="comment">// suppress warning in release builds</span>
m_buffer<span class="operator">.</span>resize(length);
<span class="type">unsigned</span> <span class="type">char</span> <span class="operator">*</span>ptr <span class="operator">=</span> <span class="keyword">reinterpret_cast</span><span class="operator">&lt;</span><span class="type">unsigned</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">&gt;</span>(m_buffer<span class="operator">.</span>data());
<span class="type">int</span> sampleIndex <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">while</span> (length) {
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> x <span class="operator">=</span> <a href="qtcore-qmath-h.html#qSin">qSin</a>(<span class="number">2</span> <span class="operator">*</span> M_PI <span class="operator">*</span> frequency <span class="operator">*</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(sampleIndex <span class="operator">%</span> format<span class="operator">.</span>frequency()) <span class="operator">/</span> format<span class="operator">.</span>frequency());
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator">&lt;</span>format<span class="operator">.</span>channels(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">if</span> (format<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">8</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> format<span class="operator">.</span>sampleType() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>UnSignedInt) {
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#quint8-typedef">quint8</a></span> value <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#quint8-typedef">quint8</a></span><span class="operator">&gt;</span>((<span class="number">1.0</span> <span class="operator">+</span> x) <span class="operator">/</span> <span class="number">2</span> <span class="operator">*</span> <span class="number">255</span>);
<span class="operator">*</span><span class="keyword">reinterpret_cast</span><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#quint8-typedef">quint8</a></span><span class="operator">*</span><span class="operator">&gt;</span>(ptr) <span class="operator">=</span> value;
} <span class="keyword">else</span> <span class="keyword">if</span> (format<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">8</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> format<span class="operator">.</span>sampleType() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>SignedInt) {
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint8-typedef">qint8</a></span> value <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#qint8-typedef">qint8</a></span><span class="operator">&gt;</span>(x <span class="operator">*</span> <span class="number">127</span>);
<span class="operator">*</span><span class="keyword">reinterpret_cast</span><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#quint8-typedef">quint8</a></span><span class="operator">*</span><span class="operator">&gt;</span>(ptr) <span class="operator">=</span> value;
} <span class="keyword">else</span> <span class="keyword">if</span> (format<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">16</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> format<span class="operator">.</span>sampleType() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>UnSignedInt) {
<span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span> value <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span><span class="operator">&gt;</span>((<span class="number">1.0</span> <span class="operator">+</span> x) <span class="operator">/</span> <span class="number">2</span> <span class="operator">*</span> <span class="number">65535</span>);
<span class="keyword">if</span> (format<span class="operator">.</span>byteOrder() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>LittleEndian)
<a href="qtendian.html#qToLittleEndian">qToLittleEndian</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span><span class="operator">&gt;</span>(value<span class="operator">,</span> ptr);
<span class="keyword">else</span>
<a href="qtendian.html#qToBigEndian">qToBigEndian</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span><span class="operator">&gt;</span>(value<span class="operator">,</span> ptr);
} <span class="keyword">else</span> <span class="keyword">if</span> (format<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">16</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> format<span class="operator">.</span>sampleType() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>SignedInt) {
<span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span> value <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">&gt;</span>(x <span class="operator">*</span> <span class="number">32767</span>);
<span class="keyword">if</span> (format<span class="operator">.</span>byteOrder() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>LittleEndian)
<a href="qtendian.html#qToLittleEndian">qToLittleEndian</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">&gt;</span>(value<span class="operator">,</span> ptr);
<span class="keyword">else</span>
<a href="qtendian.html#qToBigEndian">qToBigEndian</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">&gt;</span>(value<span class="operator">,</span> ptr);
}
ptr <span class="operator">+</span><span class="operator">=</span> channelBytes;
length <span class="operator">-</span><span class="operator">=</span> channelBytes;
}
<span class="operator">+</span><span class="operator">+</span>sampleIndex;
}
}
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> Generator<span class="operator">::</span>readData(<span class="type">char</span> <span class="operator">*</span>data<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> len)
{
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> total <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">while</span> (len <span class="operator">-</span> total <span class="operator">&gt;</span> <span class="number">0</span>) {
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> chunk <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>((m_buffer<span class="operator">.</span>size() <span class="operator">-</span> m_pos)<span class="operator">,</span> len <span class="operator">-</span> total);
memcpy(data <span class="operator">+</span> total<span class="operator">,</span> m_buffer<span class="operator">.</span>constData() <span class="operator">+</span> m_pos<span class="operator">,</span> chunk);
m_pos <span class="operator">=</span> (m_pos <span class="operator">+</span> chunk) <span class="operator">%</span> m_buffer<span class="operator">.</span>size();
total <span class="operator">+</span><span class="operator">=</span> chunk;
}
<span class="keyword">return</span> total;
}
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> Generator<span class="operator">::</span>writeData(<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>data<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> len)
{
Q_UNUSED(data);
Q_UNUSED(len);
<span class="keyword">return</span> <span class="number">0</span>;
}
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> Generator<span class="operator">::</span>bytesAvailable() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_buffer<span class="operator">.</span>size() <span class="operator">+</span> <span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>bytesAvailable();
}
AudioTest<span class="operator">::</span>AudioTest()
: m_pullTimer(<span class="keyword">new</span> <span class="type"><a href="qtimer.html">QTimer</a></span>(<span class="keyword">this</span>))
<span class="operator">,</span> m_modeButton(<span class="number">0</span>)
<span class="operator">,</span> m_suspendResumeButton(<span class="number">0</span>)
<span class="operator">,</span> m_deviceBox(<span class="number">0</span>)
<span class="operator">,</span> m_device(<span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">::</span>defaultOutputDevice())
<span class="operator">,</span> m_generator(<span class="number">0</span>)
<span class="operator">,</span> m_audioOutput(<span class="number">0</span>)
<span class="operator">,</span> m_output(<span class="number">0</span>)
<span class="operator">,</span> m_buffer(BufferSize<span class="operator">,</span> <span class="number">0</span>)
{
initializeWindow();
initializeAudio();
}
<span class="type">void</span> AudioTest<span class="operator">::</span>initializeWindow()
{
<span class="type"><a href="qscopedpointer.html">QScopedPointer</a></span><span class="operator">&lt;</span><span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">&gt;</span> window(<span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>);
<span class="type"><a href="qscopedpointer.html">QScopedPointer</a></span><span class="operator">&lt;</span><span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span><span class="operator">&gt;</span> layout(<span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>);
m_deviceBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>(<span class="keyword">this</span>);
foreach (<span class="keyword">const</span> <span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span> <span class="operator">&amp;</span>deviceInfo<span class="operator">,</span> <span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">::</span>availableDevices(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>AudioOutput))
m_deviceBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(deviceInfo<span class="operator">.</span>deviceName()<span class="operator">,</span> <span class="type"><a href="qvariant.html">QVariant</a></span><span class="operator">::</span>fromValue(deviceInfo));
connect(m_deviceBox<span class="operator">,</span>SIGNAL(activated(<span class="type">int</span>))<span class="operator">,</span>SLOT(deviceChanged(<span class="type">int</span>)));
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_deviceBox);
m_modeButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(<span class="keyword">this</span>);
m_modeButton<span class="operator">-</span><span class="operator">&gt;</span>setText(PushModeLabel);
connect(m_modeButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> SLOT(toggleMode()));
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_modeButton);
m_suspendResumeButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(<span class="keyword">this</span>);
m_suspendResumeButton<span class="operator">-</span><span class="operator">&gt;</span>setText(SuspendLabel);
connect(m_suspendResumeButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> SLOT(toggleSuspendResume()));
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_suspendResumeButton);
window<span class="operator">-</span><span class="operator">&gt;</span>setLayout(layout<span class="operator">.</span>data());
layout<span class="operator">.</span>take(); <span class="comment">// ownership transferred</span>
setCentralWidget(window<span class="operator">.</span>data());
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span><span class="keyword">const</span> windowPtr <span class="operator">=</span> window<span class="operator">.</span>take(); <span class="comment">// ownership transferred</span>
windowPtr<span class="operator">-</span><span class="operator">&gt;</span>show();
}
<span class="type">void</span> AudioTest<span class="operator">::</span>initializeAudio()
{
connect(m_pullTimer<span class="operator">,</span> SIGNAL(timeout())<span class="operator">,</span> SLOT(pullTimerExpired()));
m_pullMode <span class="operator">=</span> <span class="keyword">true</span>;
m_format<span class="operator">.</span>setFrequency(DataFrequencyHz);
m_format<span class="operator">.</span>setChannels(<span class="number">1</span>);
m_format<span class="operator">.</span>setSampleSize(<span class="number">16</span>);
m_format<span class="operator">.</span>setCodec(<span class="string">&quot;audio/pcm&quot;</span>);
m_format<span class="operator">.</span>setByteOrder(<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>LittleEndian);
m_format<span class="operator">.</span>setSampleType(<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>SignedInt);
<span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span> info(<span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">::</span>defaultOutputDevice());
<span class="keyword">if</span> (<span class="operator">!</span>info<span class="operator">.</span>isFormatSupported(m_format)) {
<a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Default format not supported - trying to use nearest&quot;</span>;
m_format <span class="operator">=</span> info<span class="operator">.</span>nearestFormat(m_format);
}
m_generator <span class="operator">=</span> <span class="keyword">new</span> Generator(m_format<span class="operator">,</span> DurationSeconds<span class="operator">*</span><span class="number">1000000</span><span class="operator">,</span> ToneFrequencyHz<span class="operator">,</span> <span class="keyword">this</span>);
createAudioOutput();
}
<span class="type">void</span> AudioTest<span class="operator">::</span>createAudioOutput()
{
<span class="keyword">delete</span> m_audioOutput;
m_audioOutput <span class="operator">=</span> <span class="number">0</span>;
m_audioOutput <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaudiooutput.html">QAudioOutput</a></span>(m_device<span class="operator">,</span> m_format<span class="operator">,</span> <span class="keyword">this</span>);
connect(m_audioOutput<span class="operator">,</span> SIGNAL(notify())<span class="operator">,</span> SLOT(notified()));
connect(m_audioOutput<span class="operator">,</span> SIGNAL(stateChanged(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State))<span class="operator">,</span> SLOT(stateChanged(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State)));
m_generator<span class="operator">-</span><span class="operator">&gt;</span>start();
m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>start(m_generator);
}
AudioTest<span class="operator">::</span><span class="operator">~</span>AudioTest()
{
}
<span class="type">void</span> AudioTest<span class="operator">::</span>deviceChanged(<span class="type">int</span> index)
{
m_pullTimer<span class="operator">-</span><span class="operator">&gt;</span>stop();
m_generator<span class="operator">-</span><span class="operator">&gt;</span>stop();
m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>stop();
m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>disconnect(<span class="keyword">this</span>);
m_device <span class="operator">=</span> m_deviceBox<span class="operator">-</span><span class="operator">&gt;</span>itemData(index)<span class="operator">.</span>value<span class="operator">&lt;</span><span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">&gt;</span>();
createAudioOutput();
}
<span class="type">void</span> AudioTest<span class="operator">::</span>notified()
{
<a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;bytesFree = &quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>bytesFree()
<span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;, &quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;elapsedUSecs = &quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>elapsedUSecs()
<span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;, &quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;processedUSecs = &quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>processedUSecs();
}
<span class="type">void</span> AudioTest<span class="operator">::</span>pullTimerExpired()
{
<span class="keyword">if</span> (m_audioOutput <span class="operator">&amp;</span><span class="operator">&amp;</span> m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>StoppedState) {
<span class="type">int</span> chunks <span class="operator">=</span> m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>bytesFree()<span class="operator">/</span>m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>periodSize();
<span class="keyword">while</span> (chunks) {
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> len <span class="operator">=</span> m_generator<span class="operator">-</span><span class="operator">&gt;</span>read(m_buffer<span class="operator">.</span>data()<span class="operator">,</span> m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>periodSize());
<span class="keyword">if</span> (len)
m_output<span class="operator">-</span><span class="operator">&gt;</span>write(m_buffer<span class="operator">.</span>data()<span class="operator">,</span> len);
<span class="keyword">if</span> (len <span class="operator">!</span><span class="operator">=</span> m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>periodSize())
<span class="keyword">break</span>;
<span class="operator">-</span><span class="operator">-</span>chunks;
}
}
}
<span class="type">void</span> AudioTest<span class="operator">::</span>toggleMode()
{
m_pullTimer<span class="operator">-</span><span class="operator">&gt;</span>stop();
m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>stop();
<span class="keyword">if</span> (m_pullMode) {
m_modeButton<span class="operator">-</span><span class="operator">&gt;</span>setText(PullModeLabel);
m_output <span class="operator">=</span> m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>start();
m_pullMode <span class="operator">=</span> <span class="keyword">false</span>;
m_pullTimer<span class="operator">-</span><span class="operator">&gt;</span>start(<span class="number">20</span>);
} <span class="keyword">else</span> {
m_modeButton<span class="operator">-</span><span class="operator">&gt;</span>setText(PushModeLabel);
m_pullMode <span class="operator">=</span> <span class="keyword">true</span>;
m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>start(m_generator);
}
m_suspendResumeButton<span class="operator">-</span><span class="operator">&gt;</span>setText(SuspendLabel);
}
<span class="type">void</span> AudioTest<span class="operator">::</span>toggleSuspendResume()
{
<span class="keyword">if</span> (m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>SuspendedState) {
<a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;status: Suspended, resume()&quot;</span>;
m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>resume();
m_suspendResumeButton<span class="operator">-</span><span class="operator">&gt;</span>setText(SuspendLabel);
} <span class="keyword">else</span> <span class="keyword">if</span> (m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>ActiveState) {
<a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;status: Active, suspend()&quot;</span>;
m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>suspend();
m_suspendResumeButton<span class="operator">-</span><span class="operator">&gt;</span>setText(ResumeLabel);
} <span class="keyword">else</span> <span class="keyword">if</span> (m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>StoppedState) {
<a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;status: Stopped, resume()&quot;</span>;
m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>resume();
m_suspendResumeButton<span class="operator">-</span><span class="operator">&gt;</span>setText(SuspendLabel);
} <span class="keyword">else</span> <span class="keyword">if</span> (m_audioOutput<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>IdleState) {
<a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;status: IdleState&quot;</span>;
}
}
<span class="type">void</span> AudioTest<span class="operator">::</span>stateChanged(<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>State state)
{
<a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;state = &quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> state;
}</pre>
</div>
<!-- @@@multimedia/audiooutput/audiooutput.cpp -->
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