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<h1 class="title">audioinput.cpp Example File</h1>
<span class="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) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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 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
** "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 "audioinput.h"</span>
<span class="preprocessor">#include <stdlib.h></span>
<span class="preprocessor">#include <math.h></span>
<span class="preprocessor">#include <QDateTime></span>
<span class="preprocessor">#include <QDebug></span>
<span class="preprocessor">#include <QPainter></span>
<span class="preprocessor">#include <QVBoxLayout></span>
<span class="preprocessor">#include <QAudioDeviceInfo></span>
<span class="preprocessor">#include <QAudioInput></span>
<span class="preprocessor">#include <qendian.h></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">&</span>format)
: m_format(format)
{
<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">case</span> <span class="number">32</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">0xffffffff</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">0x7fffffff</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>Float:
m_maxAmplitude <span class="operator">=</span> <span class="number">0x7fffffff</span>; <span class="comment">// Kind of</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>;
}
}
<span class="type">void</span> AudioInfo<span class="operator">::</span>start()
{
open(<span class="type">QIODevice</span><span class="operator">::</span>WriteOnly);
}
<span class="type">void</span> AudioInfo<span class="operator">::</span>stop()
{
close();
}
<span class="type">qint64</span> AudioInfo<span class="operator">::</span>readData(<span class="type">char</span> <span class="operator">*</span>data<span class="operator">,</span> <span class="type">qint64</span> maxlen)
{
Q_UNUSED(data)
Q_UNUSED(maxlen)
<span class="keyword">return</span> <span class="number">0</span>;
}
<span class="type">qint64</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">qint64</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>channelCount() <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">quint32</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"><</span><span class="keyword">const</span> <span class="type">unsigned</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">></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"><</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"><</span> m_format<span class="operator">.</span>channelCount(); <span class="operator">+</span><span class="operator">+</span>j) {
<span class="type">quint32</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">&</span><span class="operator">&</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"><</span><span class="keyword">const</span> <span class="type">quint8</span><span class="operator">*</span><span class="operator">></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">&</span><span class="operator">&</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> qAbs(<span class="operator">*</span><span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="keyword">const</span> <span class="type">qint8</span><span class="operator">*</span><span class="operator">></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">&</span><span class="operator">&</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> qFromLittleEndian<span class="operator"><</span><span class="type">quint16</span><span class="operator">></span>(ptr);
<span class="keyword">else</span>
value <span class="operator">=</span> qFromBigEndian<span class="operator"><</span><span class="type">quint16</span><span class="operator">></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">&</span><span class="operator">&</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> qAbs(qFromLittleEndian<span class="operator"><</span><span class="type">qint16</span><span class="operator">></span>(ptr));
<span class="keyword">else</span>
value <span class="operator">=</span> qAbs(qFromBigEndian<span class="operator"><</span><span class="type">qint16</span><span class="operator">></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">32</span> <span class="operator">&</span><span class="operator">&</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> qFromLittleEndian<span class="operator"><</span><span class="type">quint32</span><span class="operator">></span>(ptr);
<span class="keyword">else</span>
value <span class="operator">=</span> qFromBigEndian<span class="operator"><</span><span class="type">quint32</span><span class="operator">></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">32</span> <span class="operator">&</span><span class="operator">&</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> qAbs(qFromLittleEndian<span class="operator"><</span><span class="type">qint32</span><span class="operator">></span>(ptr));
<span class="keyword">else</span>
value <span class="operator">=</span> qAbs(qFromBigEndian<span class="operator"><</span><span class="type">qint32</span><span class="operator">></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">32</span> <span class="operator">&</span><span class="operator">&</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>Float) {
value <span class="operator">=</span> qAbs(<span class="operator">*</span><span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="keyword">const</span> <span class="type">float</span><span class="operator">*</span><span class="operator">></span>(ptr) <span class="operator">*</span> <span class="number">0x7fffffff</span>); <span class="comment">// assumes 0-1.0</span>
}
maxValue <span class="operator">=</span> qMax(value<span class="operator">,</span> maxValue);
ptr <span class="operator">+</span><span class="operator">=</span> channelBytes;
}
}
maxValue <span class="operator">=</span> qMin(maxValue<span class="operator">,</span> m_maxAmplitude);
m_level <span class="operator">=</span> <span class="type">qreal</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">QWidget</span> <span class="operator">*</span>parent)
: <span class="type">QWidget</span>(parent)
{
setBackgroundRole(<span class="type">QPalette</span><span class="operator">::</span>Base);
setAutoFillBackground(<span class="keyword">true</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">QPaintEvent</span> <span class="operator">*</span> <span class="comment">/* event */</span>)
{
<span class="type">QPainter</span> painter(<span class="keyword">this</span>);
painter<span class="operator">.</span>setPen(<span class="type">Qt</span><span class="operator">::</span>black);
painter<span class="operator">.</span>drawRect(<span class="type">QRect</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>;
<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;
painter<span class="operator">.</span>fillRect(painter<span class="operator">.</span>viewport()<span class="operator">.</span>left()<span class="operator">+</span><span class="number">11</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>
pos<span class="operator">,</span>
painter<span class="operator">.</span>viewport()<span class="operator">.</span>height()<span class="operator">-</span><span class="number">21</span><span class="operator">,</span>
<span class="type">Qt</span><span class="operator">::</span>red);
}
<span class="type">void</span> RenderArea<span class="operator">::</span>setLevel(<span class="type">qreal</span> value)
{
m_level <span class="operator">=</span> value;
update();
}
InputTest<span class="operator">::</span>InputTest()
{
initializeWindow();
initializeAudio(<span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">::</span>defaultInputDevice());
}
<span class="type">void</span> InputTest<span class="operator">::</span>initializeWindow()
{
<span class="type">QWidget</span> <span class="operator">*</span>window <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QWidget</span>;
<span class="type">QVBoxLayout</span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QVBoxLayout</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">></span>addWidget(m_canvas);
m_deviceBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QComboBox</span>(<span class="keyword">this</span>);
<span class="keyword">const</span> <span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span> <span class="operator">&</span>defaultDeviceInfo <span class="operator">=</span> <span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span><span class="operator">::</span>defaultInputDevice();
m_deviceBox<span class="operator">-</span><span class="operator">></span>addItem(defaultDeviceInfo<span class="operator">.</span>deviceName()<span class="operator">,</span> qVariantFromValue(defaultDeviceInfo));
<span class="keyword">for</span> (<span class="keyword">auto</span> <span class="operator">&</span>deviceInfo: <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">if</span> (deviceInfo <span class="operator">!</span><span class="operator">=</span> defaultDeviceInfo)
m_deviceBox<span class="operator">-</span><span class="operator">></span>addItem(deviceInfo<span class="operator">.</span>deviceName()<span class="operator">,</span> qVariantFromValue(deviceInfo));
}
connect(m_deviceBox<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type">QComboBox</span><span class="operator">::</span>activated)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>InputTest<span class="operator">::</span>deviceChanged);
layout<span class="operator">-</span><span class="operator">></span>addWidget(m_deviceBox);
m_volumeSlider <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QSlider</span>(<span class="type">Qt</span><span class="operator">::</span>Horizontal<span class="operator">,</span> <span class="keyword">this</span>);
m_volumeSlider<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">100</span>);
m_volumeSlider<span class="operator">-</span><span class="operator">></span>setValue(<span class="number">100</span>);
connect(m_volumeSlider<span class="operator">,</span> <span class="operator">&</span><span class="type">QSlider</span><span class="operator">::</span>valueChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>InputTest<span class="operator">::</span>sliderChanged);
layout<span class="operator">-</span><span class="operator">></span>addWidget(m_volumeSlider);
m_modeButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>(<span class="keyword">this</span>);
connect(m_modeButton<span class="operator">,</span> <span class="operator">&</span><span class="type">QPushButton</span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>InputTest<span class="operator">::</span>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">QPushButton</span>(<span class="keyword">this</span>);
connect(m_suspendResumeButton<span class="operator">,</span> <span class="operator">&</span><span class="type">QPushButton</span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>InputTest<span class="operator">::</span>toggleSuspend);
layout<span class="operator">-</span><span class="operator">></span>addWidget(m_suspendResumeButton);
window<span class="operator">-</span><span class="operator">></span>setLayout(layout);
setCentralWidget(window);
window<span class="operator">-</span><span class="operator">></span>show();
}
<span class="type">void</span> InputTest<span class="operator">::</span>initializeAudio(<span class="keyword">const</span> <span class="type"><a href="qaudiodeviceinfo.html">QAudioDeviceInfo</a></span> <span class="operator">&</span>deviceInfo)
{
<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> format;
format<span class="operator">.</span>setSampleRate(<span class="number">8000</span>);
format<span class="operator">.</span>setChannelCount(<span class="number">1</span>);
format<span class="operator">.</span>setSampleSize(<span class="number">16</span>);
format<span class="operator">.</span>setSampleType(<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>SignedInt);
format<span class="operator">.</span>setByteOrder(<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>LittleEndian);
format<span class="operator">.</span>setCodec(<span class="string">"audio/pcm"</span>);
<span class="keyword">if</span> (<span class="operator">!</span>deviceInfo<span class="operator">.</span>isFormatSupported(format)) {
qWarning() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Default format not supported - trying to use nearest"</span>;
format <span class="operator">=</span> deviceInfo<span class="operator">.</span>nearestFormat(format);
}
m_audioInfo<span class="operator">.</span>reset(<span class="keyword">new</span> AudioInfo(format));
connect(m_audioInfo<span class="operator">.</span>data()<span class="operator">,</span> <span class="operator">&</span>AudioInfo<span class="operator">::</span>update<span class="operator">,</span> <span class="operator">[</span><span class="keyword">this</span><span class="operator">]</span>() {
m_canvas<span class="operator">-</span><span class="operator">></span>setLevel(m_audioInfo<span class="operator">-</span><span class="operator">></span>level());
});
m_audioInput<span class="operator">.</span>reset(<span class="keyword">new</span> <span class="type"><a href="qaudioinput.html">QAudioInput</a></span>(deviceInfo<span class="operator">,</span> format));
<span class="type">qreal</span> initialVolume <span class="operator">=</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>convertVolume(m_audioInput<span class="operator">-</span><span class="operator">></span>volume()<span class="operator">,</span>
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>LinearVolumeScale<span class="operator">,</span>
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>LogarithmicVolumeScale);
m_volumeSlider<span class="operator">-</span><span class="operator">></span>setValue(qRound(initialVolume <span class="operator">*</span> <span class="number">100</span>));
m_audioInfo<span class="operator">-</span><span class="operator">></span>start();
toggleMode();
}
<span class="type">void</span> InputTest<span class="operator">::</span>toggleMode()
{
m_audioInput<span class="operator">-</span><span class="operator">></span>stop();
toggleSuspend();
<span class="comment">// Change bewteen pull and push modes</span>
<span class="keyword">if</span> (m_pullMode) {
m_modeButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Enable push mode"</span>));
m_audioInput<span class="operator">-</span><span class="operator">></span>start(m_audioInfo<span class="operator">.</span>data());
} <span class="keyword">else</span> {
m_modeButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Enable pull mode"</span>));
<span class="keyword">auto</span> io <span class="operator">=</span> m_audioInput<span class="operator">-</span><span class="operator">></span>start();
connect(io<span class="operator">,</span> <span class="operator">&</span><span class="type">QIODevice</span><span class="operator">::</span>readyRead<span class="operator">,</span>
<span class="operator">[</span><span class="operator">&</span><span class="operator">,</span> io<span class="operator">]</span>() {
<span class="type">qint64</span> len <span class="operator">=</span> m_audioInput<span class="operator">-</span><span class="operator">></span>bytesReady();
<span class="keyword">const</span> <span class="type">int</span> BufferSize <span class="operator">=</span> <span class="number">4096</span>;
<span class="keyword">if</span> (len <span class="operator">></span> BufferSize)
len <span class="operator">=</span> BufferSize;
<span class="type">QByteArray</span> buffer(len<span class="operator">,</span> <span class="number">0</span>);
<span class="type">qint64</span> l <span class="operator">=</span> io<span class="operator">-</span><span class="operator">></span>read(buffer<span class="operator">.</span>data()<span class="operator">,</span> len);
<span class="keyword">if</span> (l <span class="operator">></span> <span class="number">0</span>)
m_audioInfo<span class="operator">-</span><span class="operator">></span>write(buffer<span class="operator">.</span>constData()<span class="operator">,</span> l);
});
}
m_pullMode <span class="operator">=</span> <span class="operator">!</span>m_pullMode;
}
<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">></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 <span class="operator">|</span><span class="operator">|</span> m_audioInput<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) {
m_audioInput<span class="operator">-</span><span class="operator">></span>resume();
m_suspendResumeButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Suspend recording"</span>));
} <span class="keyword">else</span> <span class="keyword">if</span> (m_audioInput<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) {
m_audioInput<span class="operator">-</span><span class="operator">></span>suspend();
m_suspendResumeButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Resume recording"</span>));
} <span class="keyword">else</span> <span class="keyword">if</span> (m_audioInput<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) {
<span class="comment">// no-op</span>
}
}
<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">></span>stop();
m_audioInput<span class="operator">-</span><span class="operator">></span>stop();
m_audioInput<span class="operator">-</span><span class="operator">></span>disconnect(<span class="keyword">this</span>);
initializeAudio(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>());
}
<span class="type">void</span> InputTest<span class="operator">::</span>sliderChanged(<span class="type">int</span> value)
{
<span class="type">qreal</span> linearVolume <span class="operator">=</span> <span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>convertVolume(value <span class="operator">/</span> <span class="type">qreal</span>(<span class="number">100</span>)<span class="operator">,</span>
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>LogarithmicVolumeScale<span class="operator">,</span>
<span class="type"><a href="qaudio.html">QAudio</a></span><span class="operator">::</span>LinearVolumeScale);
m_audioInput<span class="operator">-</span><span class="operator">></span>setVolume(linearVolume);
}
</pre>
</div>
<!-- @@@multimedia/audioinput/audioinput.cpp -->
</div>
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<acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.<br/> 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.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property
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distrib
>
Mageia
>
7
>
i586
>
media
>
core-updates
>
by-pkgid
>
1680fb88efc4e76ac8cb0ebf3578014f
>
files
>
328
