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<h1 class="title">audioinput.cpp Example File</h1>
<span class="small-subtitle">multimedia/audioinput/audioinput.cpp</span>
<!-- $$$multimedia/audioinput/audioinput.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;stdlib.h&gt;</span>
<span class="preprocessor">#include &lt;math.h&gt;</span>
<span class="preprocessor">#include &lt;QDebug&gt;</span>
<span class="preprocessor">#include &lt;QPainter&gt;</span>
<span class="preprocessor">#include &lt;QVBoxLayout&gt;</span>
<span class="preprocessor">#include &lt;QAudioDeviceInfo&gt;</span>
<span class="preprocessor">#include &lt;QAudioInput&gt;</span>
<span class="preprocessor">#include &lt;QtCore/qendian.h&gt;</span>
<span class="preprocessor">#include &quot;audioinput.h&quot;</span>
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> InputTest<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> InputTest<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> InputTest<span class="operator">::</span>SuspendLabel(tr(<span class="string">&quot;Suspend recording&quot;</span>));
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> InputTest<span class="operator">::</span>ResumeLabel(tr(<span class="string">&quot;Resume recording&quot;</span>));
<span class="keyword">const</span> <span class="type">int</span> BufferSize <span class="operator">=</span> <span class="number">4096</span>;
AudioInfo<span class="operator">::</span>AudioInfo(<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="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_format(format)
<span class="operator">,</span> m_maxAmplitude(<span class="number">0</span>)
<span class="operator">,</span> m_level(<span class="number">0.0</span>)
{
<span class="keyword">switch</span> (m_format<span class="operator">.</span>sampleSize()) {
<span class="keyword">case</span> <span class="number">8</span>:
<span class="keyword">switch</span> (m_format<span class="operator">.</span>sampleType()) {
<span class="keyword">case</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>UnSignedInt:
m_maxAmplitude <span class="operator">=</span> <span class="number">255</span>;
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>SignedInt:
m_maxAmplitude <span class="operator">=</span> <span class="number">127</span>;
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="number">16</span>:
<span class="keyword">switch</span> (m_format<span class="operator">.</span>sampleType()) {
<span class="keyword">case</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>UnSignedInt:
m_maxAmplitude <span class="operator">=</span> <span class="number">65535</span>;
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>SignedInt:
m_maxAmplitude <span class="operator">=</span> <span class="number">32767</span>;
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
}
AudioInfo<span class="operator">::</span><span class="operator">~</span>AudioInfo()
{
}
<span class="type">void</span> AudioInfo<span class="operator">::</span>start()
{
open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>WriteOnly);
}
<span class="type">void</span> AudioInfo<span class="operator">::</span>stop()
{
close();
}
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> AudioInfo<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> maxlen)
{
Q_UNUSED(data)
Q_UNUSED(maxlen)
<span class="keyword">return</span> <span class="number">0</span>;
}
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> AudioInfo<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)
{
<span class="keyword">if</span> (m_maxAmplitude) {
Q_ASSERT(m_format<span class="operator">.</span>sampleSize() <span class="operator">%</span> <span class="number">8</span> <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>);
<span class="keyword">const</span> <span class="type">int</span> channelBytes <span class="operator">=</span> m_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> m_format<span class="operator">.</span>channels() <span class="operator">*</span> channelBytes;
Q_ASSERT(len <span class="operator">%</span> sampleBytes <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>);
<span class="keyword">const</span> <span class="type">int</span> numSamples <span class="operator">=</span> len <span class="operator">/</span> sampleBytes;
<span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span> maxValue <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">const</span> <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="keyword">const</span> <span class="type">unsigned</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">&gt;</span>(data);
<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> numSamples; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">for</span>(<span class="type">int</span> j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator">&lt;</span> m_format<span class="operator">.</span>channels(); <span class="operator">+</span><span class="operator">+</span>j) {
<span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span> value <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">if</span> (m_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> m_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) {
value <span class="operator">=</span> <span class="operator">*</span><span class="keyword">reinterpret_cast</span><span class="operator">&lt;</span><span class="keyword">const</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="keyword">else</span> <span class="keyword">if</span> (m_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> m_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) {
value <span class="operator">=</span> <a href="qtglobal.html#qAbs">qAbs</a>(<span class="operator">*</span><span class="keyword">reinterpret_cast</span><span class="operator">&lt;</span><span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint8-typedef">qint8</a></span><span class="operator">*</span><span class="operator">&gt;</span>(ptr));
} <span class="keyword">else</span> <span class="keyword">if</span> (m_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> m_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">if</span> (m_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)
value <span class="operator">=</span> <a href="qtendian.html#qFromLittleEndian">qFromLittleEndian</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span><span class="operator">&gt;</span>(ptr);
<span class="keyword">else</span>
value <span class="operator">=</span> <a href="qtendian.html#qFromBigEndian">qFromBigEndian</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span><span class="operator">&gt;</span>(ptr);
} <span class="keyword">else</span> <span class="keyword">if</span> (m_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> m_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">if</span> (m_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)
value <span class="operator">=</span> <a href="qtglobal.html#qAbs">qAbs</a>(<a href="qtendian.html#qFromLittleEndian">qFromLittleEndian</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">&gt;</span>(ptr));
<span class="keyword">else</span>
value <span class="operator">=</span> <a href="qtglobal.html#qAbs">qAbs</a>(<a href="qtendian.html#qFromBigEndian">qFromBigEndian</a><span class="operator">&lt;</span><span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">&gt;</span>(ptr));
}
maxValue <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a>(value<span class="operator">,</span> maxValue);
ptr <span class="operator">+</span><span class="operator">=</span> channelBytes;
}
}
maxValue <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>(maxValue<span class="operator">,</span> m_maxAmplitude);
m_level <span class="operator">=</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(maxValue) <span class="operator">/</span> m_maxAmplitude;
}
<span class="keyword">emit</span> update();
<span class="keyword">return</span> len;
}
RenderArea<span class="operator">::</span>RenderArea(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
{
setBackgroundRole(<span class="type"><a href="qpalette.html">QPalette</a></span><span class="operator">::</span>Base);
setAutoFillBackground(<span class="keyword">true</span>);
m_level <span class="operator">=</span> <span class="number">0</span>;
setMinimumHeight(<span class="number">30</span>);
setMinimumWidth(<span class="number">200</span>);
}
<span class="type">void</span> RenderArea<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span> <span class="comment">/* event */</span>)
{
<span class="type"><a href="qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>);
painter<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
painter<span class="operator">.</span>drawRect(<span class="type"><a href="qrect.html">QRect</a></span>(painter<span class="operator">.</span>viewport()<span class="operator">.</span>left()<span class="operator">+</span><span class="number">10</span><span class="operator">,</span>
painter<span class="operator">.</span>viewport()<span class="operator">.</span>top()<span class="operator">+</span><span class="number">10</span><span class="operator">,</span>
painter<span class="operator">.</span>viewport()<span class="operator">.</span>right()<span class="operator">-</span><span class="number">20</span><span class="operator">,</span>
painter<span class="operator">.</span>viewport()<span class="operator">.</span>bottom()<span class="operator">-</span><span class="number">20</span>));
<span class="keyword">if</span> (m_level <span class="operator">=</span><span class="operator">=</span> <span class="number">0.0</span>)
<span class="keyword">return</span>;
painter<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>red);
<span class="type">int</span> pos <span class="operator">=</span> ((painter<span class="operator">.</span>viewport()<span class="operator">.</span>right()<span class="operator">-</span><span class="number">20</span>)<span class="operator">-</span>(painter<span class="operator">.</span>viewport()<span class="operator">.</span>left()<span class="operator">+</span><span class="number">11</span>))<span class="operator">*</span>m_level;
<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> <span class="number">10</span>; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type">int</span> x1 <span class="operator">=</span> painter<span class="operator">.</span>viewport()<span class="operator">.</span>left()<span class="operator">+</span><span class="number">11</span>;
<span class="type">int</span> y1 <span class="operator">=</span> painter<span class="operator">.</span>viewport()<span class="operator">.</span>top()<span class="operator">+</span><span class="number">10</span><span class="operator">+</span>i;
<span class="type">int</span> x2 <span class="operator">=</span> painter<span class="operator">.</span>viewport()<span class="operator">.</span>left()<span class="operator">+</span><span class="number">20</span><span class="operator">+</span>pos;
<span class="type">int</span> y2 <span class="operator">=</span> painter<span class="operator">.</span>viewport()<span class="operator">.</span>top()<span class="operator">+</span><span class="number">10</span><span class="operator">+</span>i;
<span class="keyword">if</span> (x2 <span class="operator">&lt;</span> painter<span class="operator">.</span>viewport()<span class="operator">.</span>left()<span class="operator">+</span><span class="number">10</span>)
x2 <span class="operator">=</span> painter<span class="operator">.</span>viewport()<span class="operator">.</span>left()<span class="operator">+</span><span class="number">10</span>;
painter<span class="operator">.</span>drawLine(<span class="type"><a href="qpoint.html">QPoint</a></span>(x1<span class="operator">,</span> y1)<span class="operator">,</span><span class="type"><a href="qpoint.html">QPoint</a></span>(x2<span class="operator">,</span> y2));
}
}
<span class="type">void</span> RenderArea<span class="operator">::</span>setLevel(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> value)
{
m_level <span class="operator">=</span> value;
repaint();
}
InputTest<span class="operator">::</span>InputTest()
: m_canvas(<span class="number">0</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>defaultInputDevice())
<span class="operator">,</span> m_audioInfo(<span class="number">0</span>)
<span class="operator">,</span> m_audioInput(<span class="number">0</span>)
<span class="operator">,</span> m_input(<span class="number">0</span>)
<span class="operator">,</span> m_pullMode(<span class="keyword">false</span>)
<span class="operator">,</span> m_buffer(BufferSize<span class="operator">,</span> <span class="number">0</span>)
{
initializeWindow();
initializeAudio();
}
InputTest<span class="operator">::</span><span class="operator">~</span>InputTest() {}
<span class="type">void</span> InputTest<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_canvas <span class="operator">=</span> <span class="keyword">new</span> RenderArea(<span class="keyword">this</span>);
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_canvas);
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>);
<span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">&gt;</span> devices <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>AudioInput);
<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> devices<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i)
m_deviceBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(devices<span class="operator">.</span>at(i)<span class="operator">.</span>deviceName()<span class="operator">,</span> <span class="type"><a href="qvariant.html">QVariant</a></span><span class="operator">::</span>fromValue(devices<span class="operator">.</span>at(i)));
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(toggleSuspend()));
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> InputTest<span class="operator">::</span>initializeAudio()
{
m_pullMode <span class="operator">=</span> <span class="keyword">true</span>;
m_format<span class="operator">.</span>setFrequency(<span class="number">8000</span>);
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>setSampleType(<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>SignedInt);
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>setCodec(<span class="string">&quot;audio/pcm&quot;</span>);
<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>defaultInputDevice());
<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_audioInfo <span class="operator">=</span> <span class="keyword">new</span> AudioInfo(m_format<span class="operator">,</span> <span class="keyword">this</span>);
connect(m_audioInfo<span class="operator">,</span> SIGNAL(update())<span class="operator">,</span> SLOT(refreshDisplay()));
createAudioInput();
}
<span class="type">void</span> InputTest<span class="operator">::</span>createAudioInput()
{
m_audioInput <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaudioinput.html">QAudioInput</a></span>(m_device<span class="operator">,</span> m_format<span class="operator">,</span> <span class="keyword">this</span>);
connect(m_audioInput<span class="operator">,</span> SIGNAL(notify())<span class="operator">,</span> SLOT(notified()));
connect(m_audioInput<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_audioInfo<span class="operator">-</span><span class="operator">&gt;</span>start();
m_audioInput<span class="operator">-</span><span class="operator">&gt;</span>start(m_audioInfo);
}
<span class="type">void</span> InputTest<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;bytesReady = &quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> m_audioInput<span class="operator">-</span><span class="operator">&gt;</span>bytesReady()
<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_audioInput<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_audioInput<span class="operator">-</span><span class="operator">&gt;</span>processedUSecs();
}
<span class="type">void</span> InputTest<span class="operator">::</span>readMore()
{
<span class="keyword">if</span>(<span class="operator">!</span>m_audioInput)
<span class="keyword">return</span>;
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> len <span class="operator">=</span> m_audioInput<span class="operator">-</span><span class="operator">&gt;</span>bytesReady();
<span class="keyword">if</span>(len <span class="operator">&gt;</span> <span class="number">4096</span>)
len <span class="operator">=</span> <span class="number">4096</span>;
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> l <span class="operator">=</span> m_input<span class="operator">-</span><span class="operator">&gt;</span>read(m_buffer<span class="operator">.</span>data()<span class="operator">,</span> len);
<span class="keyword">if</span>(l <span class="operator">&gt;</span> <span class="number">0</span>) {
m_audioInfo<span class="operator">-</span><span class="operator">&gt;</span>write(m_buffer<span class="operator">.</span>constData()<span class="operator">,</span> l);
}
}
<span class="type">void</span> InputTest<span class="operator">::</span>toggleMode()
{
<span class="comment">// Change bewteen pull and push modes</span>
<span class="keyword">if</span> (m_input <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>) {
disconnect(m_input<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="number">0</span>);
m_input <span class="operator">=</span> <span class="number">0</span>;
}
m_audioInput<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_input <span class="operator">=</span> m_audioInput<span class="operator">-</span><span class="operator">&gt;</span>start();
connect(m_input<span class="operator">,</span> SIGNAL(readyRead())<span class="operator">,</span> SLOT(readMore()));
m_pullMode <span class="operator">=</span> <span class="keyword">false</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_audioInput<span class="operator">-</span><span class="operator">&gt;</span>start(m_audioInfo);
}
m_suspendResumeButton<span class="operator">-</span><span class="operator">&gt;</span>setText(SuspendLabel);
}
<span class="type">void</span> InputTest<span class="operator">::</span>toggleSuspend()
{
<span class="comment">// toggle suspend/resume</span>
<span class="keyword">if</span>(m_audioInput<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_audioInput<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_audioInput<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_audioInput<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_audioInput<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_audioInput<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_audioInput<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> InputTest<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;
}
<span class="type">void</span> InputTest<span class="operator">::</span>refreshDisplay()
{
m_canvas<span class="operator">-</span><span class="operator">&gt;</span>setLevel(m_audioInfo<span class="operator">-</span><span class="operator">&gt;</span>level());
m_canvas<span class="operator">-</span><span class="operator">&gt;</span>repaint();
}
<span class="type">void</span> InputTest<span class="operator">::</span>deviceChanged(<span class="type">int</span> index)
{
m_audioInfo<span class="operator">-</span><span class="operator">&gt;</span>stop();
m_audioInput<span class="operator">-</span><span class="operator">&gt;</span>stop();
m_audioInput<span class="operator">-</span><span class="operator">&gt;</span>disconnect(<span class="keyword">this</span>);
<span class="keyword">delete</span> m_audioInput;
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>();
createAudioInput();
}</pre>
</div>
<!-- @@@multimedia/audioinput/audioinput.cpp -->
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