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Breadcrumbs go here --> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <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) 2013 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** 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: ** ** "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 Digia Plc and its Subsidiary(-ies) 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 ** "AS IS" 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include <QDebug></span> <span class="preprocessor">#include <QVBoxLayout></span> <span class="preprocessor">#include <QAudioOutput></span> <span class="preprocessor">#include <QAudioDeviceInfo></span> <span class="preprocessor">#include <QtCore/qmath.h></span> <span class="preprocessor">#include <QtCore/qendian.h></span> <span class="preprocessor">#include "audiooutput.h"</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">"Enable push mode"</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">"Enable pull mode"</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">"Suspend playback"</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">"Resume playback"</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">&</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">&</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"><</span><span class="type">unsigned</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">></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"><</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">&</span><span class="operator">&</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"><</span><span class="type"><a href="qtglobal.html#quint8-typedef">quint8</a></span><span class="operator">></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"><</span><span class="type"><a href="qtglobal.html#quint8-typedef">quint8</a></span><span class="operator">*</span><span class="operator">></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">&</span><span class="operator">&</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"><</span><span class="type"><a href="qtglobal.html#qint8-typedef">qint8</a></span><span class="operator">></span>(x <span class="operator">*</span> <span class="number">127</span>); <span class="operator">*</span><span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="type"><a href="qtglobal.html#quint8-typedef">quint8</a></span><span class="operator">*</span><span class="operator">></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">&</span><span class="operator">&</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"><</span><span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span><span class="operator">></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"><</span><span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span><span class="operator">></span>(value<span class="operator">,</span> ptr); <span class="keyword">else</span> <a href="qtendian.html#qToBigEndian">qToBigEndian</a><span class="operator"><</span><span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span><span class="operator">></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">&</span><span class="operator">&</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"><</span><span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">></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"><</span><span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">></span>(value<span class="operator">,</span> ptr); <span class="keyword">else</span> <a href="qtendian.html#qToBigEndian">qToBigEndian</a><span class="operator"><</span><span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">></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">></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"><</span><span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">></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"><</span><span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span><span class="operator">></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">&</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">></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">></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">></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">></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">></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">></span>addWidget(m_suspendResumeButton); window<span class="operator">-</span><span class="operator">></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">></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">"audio/pcm"</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"><</span><span class="operator"><</span> <span class="string">"Default format not supported - trying to use nearest"</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">></span>start(); m_audioOutput<span class="operator">-</span><span class="operator">></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">></span>stop(); m_generator<span class="operator">-</span><span class="operator">></span>stop(); m_audioOutput<span class="operator">-</span><span class="operator">></span>stop(); m_audioOutput<span class="operator">-</span><span class="operator">></span>disconnect(<span class="keyword">this</span>); m_device <span class="operator">=</span> m_deviceBox<span class="operator">-</span><span class="operator">></span>itemData(index)<span class="operator">.</span>value<span class="operator"><</span><span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">></span>(); createAudioOutput(); } <span class="type">void</span> AudioTest<span class="operator">::</span>notified() { <a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"bytesFree = "</span> <span class="operator"><</span><span class="operator"><</span> m_audioOutput<span class="operator">-</span><span class="operator">></span>bytesFree() <span class="operator"><</span><span class="operator"><</span> <span class="string">", "</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"elapsedUSecs = "</span> <span class="operator"><</span><span class="operator"><</span> m_audioOutput<span class="operator">-</span><span class="operator">></span>elapsedUSecs() <span class="operator"><</span><span class="operator"><</span> <span class="string">", "</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"processedUSecs = "</span> <span class="operator"><</span><span class="operator"><</span> m_audioOutput<span class="operator">-</span><span class="operator">></span>processedUSecs(); } <span class="type">void</span> AudioTest<span class="operator">::</span>pullTimerExpired() { <span class="keyword">if</span> (m_audioOutput <span class="operator">&</span><span class="operator">&</span> m_audioOutput<span class="operator">-</span><span class="operator">></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">></span>bytesFree()<span class="operator">/</span>m_audioOutput<span class="operator">-</span><span class="operator">></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">></span>read(m_buffer<span class="operator">.</span>data()<span class="operator">,</span> m_audioOutput<span class="operator">-</span><span class="operator">></span>periodSize()); <span class="keyword">if</span> (len) m_output<span class="operator">-</span><span class="operator">></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">></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">></span>stop(); m_audioOutput<span class="operator">-</span><span class="operator">></span>stop(); <span class="keyword">if</span> (m_pullMode) { m_modeButton<span class="operator">-</span><span class="operator">></span>setText(PullModeLabel); m_output <span class="operator">=</span> m_audioOutput<span class="operator">-</span><span class="operator">></span>start(); m_pullMode <span class="operator">=</span> <span class="keyword">false</span>; m_pullTimer<span class="operator">-</span><span class="operator">></span>start(<span class="number">20</span>); } <span class="keyword">else</span> { m_modeButton<span class="operator">-</span><span class="operator">></span>setText(PushModeLabel); m_pullMode <span class="operator">=</span> <span class="keyword">true</span>; m_audioOutput<span class="operator">-</span><span class="operator">></span>start(m_generator); } m_suspendResumeButton<span class="operator">-</span><span class="operator">></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">></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"><</span><span class="operator"><</span> <span class="string">"status: Suspended, resume()"</span>; m_audioOutput<span class="operator">-</span><span class="operator">></span>resume(); m_suspendResumeButton<span class="operator">-</span><span class="operator">></span>setText(SuspendLabel); } <span class="keyword">else</span> <span class="keyword">if</span> (m_audioOutput<span class="operator">-</span><span class="operator">></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"><</span><span class="operator"><</span> <span class="string">"status: Active, suspend()"</span>; m_audioOutput<span class="operator">-</span><span class="operator">></span>suspend(); m_suspendResumeButton<span class="operator">-</span><span class="operator">></span>setText(ResumeLabel); } <span class="keyword">else</span> <span class="keyword">if</span> (m_audioOutput<span class="operator">-</span><span class="operator">></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"><</span><span class="operator"><</span> <span class="string">"status: Stopped, resume()"</span>; m_audioOutput<span class="operator">-</span><span class="operator">></span>resume(); m_suspendResumeButton<span class="operator">-</span><span class="operator">></span>setText(SuspendLabel); } <span class="keyword">else</span> <span class="keyword">if</span> (m_audioOutput<span class="operator">-</span><span class="operator">></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"><</span><span class="operator"><</span> <span class="string">"status: IdleState"</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"><</span><span class="operator"><</span> <span class="string">"state = "</span> <span class="operator"><</span><span class="operator"><</span> state; }</pre> </div> <!-- @@@multimedia/audiooutput/audiooutput.cpp --> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its subsidiaries. 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