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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">voicegenerator.cpp Example File</h1> <span class="small-subtitle">demos/mobile/guitartuner/src/voicegenerator.cpp</span> <!-- $$$demos/mobile/guitartuner/src/voicegenerator.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 QtDeclarative module 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 "voicegenerator.h"</span> <span class="keyword">const</span> <span class="type">int</span> BufferSizeMilliseconds <span class="operator">=</span> <span class="number">100</span>; VoiceGenerator<span class="operator">::</span>VoiceGenerator(<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#qreal-typedef">qreal</a></span> frequency<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> amplitude<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_amplitude(<span class="number">0.5</span>) { 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="type">int</span> sampleBytes <span class="operator">=</span> m_format<span class="operator">.</span>channels() <span class="operator">*</span> (m_format<span class="operator">.</span>sampleSize() <span class="operator">/</span> <span class="number">8</span>); <span class="comment">// + 1 to round up, just to be sure that all samples fit.</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> samplesInBuffer <span class="operator">=</span> m_format<span class="operator">.</span>sampleRate() <span class="operator">*</span> BufferSizeMilliseconds <span class="operator">/</span> <span class="number">1000</span> <span class="operator">+</span> <span class="number">1</span>; <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> length <span class="operator">=</span> samplesInBuffer <span class="operator">*</span> sampleBytes; m_buffer<span class="operator">.</span>resize(length); m_max_position <span class="operator">=</span> <span class="number">0</span>; m_position <span class="operator">=</span> <span class="number">0</span>; m_amplitude <span class="operator">=</span> amplitude; setFrequency(frequency); } VoiceGenerator<span class="operator">::</span><span class="operator">~</span>VoiceGenerator() { } <span class="comment">/** * Opens the parent QIODevice. */</span> <span class="type">void</span> VoiceGenerator<span class="operator">::</span>start() { open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly); } <span class="comment">/** * Closes the parent QIODevice. Resets the m_position to zero. */</span> <span class="type">void</span> VoiceGenerator<span class="operator">::</span>stop() { close(); m_position <span class="operator">=</span> <span class="number">0</span>; } <span class="comment">/** * Sets the frequency to new frequency. */</span> <span class="type">void</span> VoiceGenerator<span class="operator">::</span>setFrequency(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> frequency) { Q_ASSERT(<span class="number">1</span> <span class="operator">/</span> frequency <span class="operator"><</span> BufferSizeMilliseconds); <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>m_frequency <span class="operator">=</span> frequency; refreshData(); } <span class="comment">/** * Sets the amplitude for the voice. */</span> <span class="type">void</span> VoiceGenerator<span class="operator">::</span>setAmplitude(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> amplitude) { Q_ASSERT(amplitude <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>); m_amplitude <span class="operator">=</span> amplitude; refreshData(); } <span class="comment">/** * Returns the current frequency. */</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> VoiceGenerator<span class="operator">::</span>frequency() { <span class="keyword">return</span> m_frequency; } <span class="comment">/** * Generates voice data corresponding a sine voice with target frequency. * The number of data generated is calculated * and stored to m_max_position. */</span> <span class="type">void</span> VoiceGenerator<span class="operator">::</span>refreshData() { <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> sampleSize <span class="operator">=</span> m_format<span class="operator">.</span>channels() <span class="operator">*</span> channelBytes; <span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> voiceOscillationsInBuffer <span class="operator">=</span> BufferSizeMilliseconds <span class="operator">*</span> m_frequency <span class="operator">/</span> <span class="number">1000</span>; <span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> voiceSamplesInBuffer <span class="operator">=</span> voiceOscillationsInBuffer <span class="operator">*</span> m_format<span class="operator">.</span>sampleRate() <span class="operator">/</span> m_frequency; m_max_position <span class="operator">=</span> voiceSamplesInBuffer <span class="operator">*</span> sampleSize; <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> dataGenerationLength <span class="operator">=</span> m_buffer<span class="operator">.</span>size(); Q_ASSERT(m_max_position <span class="operator">%</span> (sampleSize) <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>); Q_ASSERT(dataGenerationLength <span class="operator"><</span><span class="operator">=</span> m_buffer<span class="operator">.</span>size()); <span class="type">short</span> <span class="operator">*</span>t <span class="operator">=</span> (<span class="type">short</span><span class="operator">*</span>)m_buffer<span class="operator">.</span>data(); <span class="comment">/* int te ; static float fpos = 0.0f; //dataGenerationLength>>=1; // in words for (int f=0; f<dataGenerationLength; f++) { te = (short)((sinf(fpos))* (65536.0f/2.0f)); fpos += m_frequency/2000.0f; t[f]= te; }; m_amplitude = 1.0f; */</span> <span class="type"><a href="qtglobal.html#uchar-typedef">uchar</a></span> <span class="operator">*</span>ptr <span class="operator">=</span> <span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="type"><a href="qtglobal.html#uchar-typedef">uchar</a></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> (dataGenerationLength <span class="operator">></span> <span class="number">0</span>) { <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> realValue <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">if</span> (sampleIndex <span class="operator"><</span> voiceSamplesInBuffer) { realValue <span class="operator">=</span> m_amplitude <span class="operator">*</span><a href="qtcore-qmath-h.html#qSin">qSin</a>(<span class="number">2.0f</span> <span class="operator">*</span> M_PI <span class="operator">*</span> m_frequency <span class="operator">*</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(sampleIndex <span class="operator">%</span> m_format<span class="operator">.</span>sampleRate()) <span class="operator">/</span> m_format<span class="operator">.</span>sampleRate()); } <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>m_format<span class="operator">.</span>channels(); <span class="operator">+</span><span class="operator">+</span>i) { setValue(ptr<span class="operator">,</span> realValue); ptr <span class="operator">+</span><span class="operator">=</span> channelBytes; dataGenerationLength <span class="operator">-</span><span class="operator">=</span> channelBytes; } <span class="operator">+</span><span class="operator">+</span>sampleIndex; } } <span class="comment">/** * Stores the realValue into bytes pointed by ptr as an int value. * Align-safe. */</span> <span class="type">void</span> VoiceGenerator<span class="operator">::</span>setValue(<span class="type"><a href="qtglobal.html#uchar-typedef">uchar</a></span> <span class="operator">*</span>ptr<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> realValue) { <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="type"><a href="qtglobal.html#quint8-typedef">quint8</a></span> value <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">if</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="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qtglobal.html#quint8-typedef">quint8</a></span><span class="operator">></span>( <a href="qtglobal.html#qRound">qRound</a>((<span class="number">1.0</span> <span class="operator">+</span> realValue) <span class="operator">/</span> <span class="number">2</span> <span class="operator">*</span> M_MAX_AMPLITUDE_8BIT_UNSIGNED)); } <span class="keyword">else</span> <span class="keyword">if</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> <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>( <a href="qtglobal.html#qRound">qRound</a>(realValue <span class="operator">*</span> M_MAX_AMPLITUDE_8BIT_SIGNED)); } <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> (m_format<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">16</span>) { <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>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="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span><span class="operator">></span>( <a href="qtglobal.html#qRound">qRound</a>((<span class="number">1.0</span> <span class="operator">+</span> realValue) <span class="operator">/</span> <span class="number">2</span> <span class="operator">*</span> M_MAX_AMPLITUDE_16BIT_UNSIGNED)); } <span class="keyword">else</span> <span class="keyword">if</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> <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>( <a href="qtglobal.html#qRound">qRound</a>(realValue <span class="operator">*</span> M_MAX_AMPLITUDE_16BIT_SIGNED)); } <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) <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); } } <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> VoiceGenerator<span class="operator">::</span>bytesAvailable() <span class="keyword">const</span> { <span class="keyword">return</span> m_max_position <span class="operator">+</span> <span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>bytesAvailable(); } <span class="comment">/** * Called by the QIODevice. Puts maxlen amount of voice * samples into the data array. */</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> VoiceGenerator<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) { <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> total <span class="operator">=</span> <span class="number">0</span>; <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> chunk <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">while</span> (total <span class="operator"><</span> maxlen) { <span class="keyword">if</span> (maxlen <span class="operator">-</span> total <span class="operator">></span><span class="operator">=</span> m_max_position <span class="operator">-</span> m_position) { <span class="comment">// the needed buffer is longer than the currently</span> <span class="comment">// available buffer from m_position to the m_max_position</span> chunk <span class="operator">=</span> m_max_position <span class="operator">-</span> m_position; memcpy(data<span class="operator">,</span> m_buffer<span class="operator">.</span>constData() <span class="operator">+</span> m_position<span class="operator">,</span> chunk); m_position <span class="operator">=</span> <span class="number">0</span>; } <span class="keyword">else</span> { <span class="comment">// we can copy the needed data directly, and the loop will end</span> chunk <span class="operator">=</span> maxlen <span class="operator">-</span> total; memcpy(data<span class="operator">,</span> m_buffer<span class="operator">.</span>constData() <span class="operator">+</span> m_position<span class="operator">,</span> chunk); m_position <span class="operator">=</span> (m_position <span class="operator">+</span> chunk) <span class="operator">%</span> m_max_position; } data <span class="operator">+</span><span class="operator">=</span> chunk; total <span class="operator">+</span><span class="operator">=</span> chunk; } <span class="keyword">return</span> total; } <span class="comment">/** * Empty implementation for writeData, since no data is provided * for the VoiceGenerator class. */</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> VoiceGenerator<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> maxlen) { Q_UNUSED(data); Q_UNUSED(maxlen); <span class="keyword">return</span> <span class="number">0</span>; }</pre> </div> <!-- @@@demos/mobile/guitartuner/src/voicegenerator.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. Documentation contributions included herein are the copyrights of their respective owners.</p> <br /> <p> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.</p> <p> Documentation sources may be obtained from <a href="http://www.qt-project.org"> www.qt-project.org</a>.</p> <br /> <p> Digia, Qt and their respective logos are trademarks of Digia Plc in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. <a title="Privacy Policy" href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p> </div> <script src="scripts/functions.js" type="text/javascript"></script> </body> </html>