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<h1 class="title">widget.cpp Example File</h1>
<span class="subtitle">audio/widget.cpp</span>
<!-- $$$audio/widget.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the Qt Charts module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:GPL$
  ** 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.
  **
  ** GNU General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU
  ** General Public License version 3 or (at your option) any later version
  ** approved by the KDE Free Qt Foundation. The licenses are as published by
  ** the Free Software Foundation and appearing in the file LICENSE.GPL3
  ** included in the packaging of this file. Please review the following
  ** information to ensure the GNU General Public License requirements will
  ** be met: https://www.gnu.org/licenses/gpl-3.0.html.
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;widget.h&quot;</span>
  <span class="preprocessor">#include &lt;QtMultimedia/QAudioDeviceInfo&gt;</span>
  <span class="preprocessor">#include &lt;QtMultimedia/QAudioInput&gt;</span>
  <span class="preprocessor">#include &lt;QtCharts/QChartView&gt;</span>
  <span class="preprocessor">#include &lt;QtCharts/QLineSeries&gt;</span>
  <span class="preprocessor">#include &lt;QtCharts/QChart&gt;</span>
  <span class="preprocessor">#include &lt;QtWidgets/QVBoxLayout&gt;</span>
  <span class="preprocessor">#include &lt;QtCharts/QValueAxis&gt;</span>
  <span class="preprocessor">#include &quot;xyseriesiodevice.h&quot;</span>

  QT_CHARTS_USE_NAMESPACE

  Widget<span class="operator">::</span>Widget(<span class="type">QWidget</span> <span class="operator">*</span>parent)
      : <span class="type">QWidget</span>(parent)<span class="operator">,</span>
        m_device(<span class="number">0</span>)<span class="operator">,</span>
        m_chart(<span class="number">0</span>)<span class="operator">,</span>
        m_series(<span class="number">0</span>)<span class="operator">,</span>
        m_audioInput(<span class="number">0</span>)
  {
      m_chart <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>;
      <span class="type"><a href="qchartview.html">QChartView</a></span> <span class="operator">*</span>chartView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchartview.html">QChartView</a></span>(m_chart);
      chartView<span class="operator">-</span><span class="operator">&gt;</span>setMinimumSize(<span class="number">800</span><span class="operator">,</span> <span class="number">600</span>);
      m_series <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineseries.html">QLineSeries</a></span>;
      m_chart<span class="operator">-</span><span class="operator">&gt;</span>addSeries(m_series);
      <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span> <span class="operator">*</span>axisX <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span>;
      axisX<span class="operator">-</span><span class="operator">&gt;</span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">2000</span>);
      axisX<span class="operator">-</span><span class="operator">&gt;</span>setLabelFormat(<span class="string">&quot;%g&quot;</span>);
      axisX<span class="operator">-</span><span class="operator">&gt;</span>setTitleText(<span class="string">&quot;Samples&quot;</span>);
      <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span> <span class="operator">*</span>axisY <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span>;
      axisY<span class="operator">-</span><span class="operator">&gt;</span>setRange(<span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
      axisY<span class="operator">-</span><span class="operator">&gt;</span>setTitleText(<span class="string">&quot;Audio level&quot;</span>);
      m_chart<span class="operator">-</span><span class="operator">&gt;</span>setAxisX(axisX<span class="operator">,</span> m_series);
      m_chart<span class="operator">-</span><span class="operator">&gt;</span>setAxisY(axisY<span class="operator">,</span> m_series);
      m_chart<span class="operator">-</span><span class="operator">&gt;</span>legend()<span class="operator">-</span><span class="operator">&gt;</span>hide();
      m_chart<span class="operator">-</span><span class="operator">&gt;</span>setTitle(<span class="string">&quot;Data from the microphone&quot;</span>);

      <span class="type">QVBoxLayout</span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QVBoxLayout</span>;
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(chartView);
      setLayout(mainLayout);

      <span class="type">QAudioFormat</span> formatAudio;
      formatAudio<span class="operator">.</span>setSampleRate(<span class="number">8000</span>);
      formatAudio<span class="operator">.</span>setChannelCount(<span class="number">1</span>);
      formatAudio<span class="operator">.</span>setSampleSize(<span class="number">8</span>);
      formatAudio<span class="operator">.</span>setCodec(<span class="string">&quot;audio/pcm&quot;</span>);
      formatAudio<span class="operator">.</span>setByteOrder(<span class="type">QAudioFormat</span><span class="operator">::</span>LittleEndian);
      formatAudio<span class="operator">.</span>setSampleType(<span class="type">QAudioFormat</span><span class="operator">::</span>UnSignedInt);

      <span class="type">QAudioDeviceInfo</span> inputDevices <span class="operator">=</span> <span class="type">QAudioDeviceInfo</span><span class="operator">::</span>defaultInputDevice();
      m_audioInput <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QAudioInput</span>(inputDevices<span class="operator">,</span>formatAudio<span class="operator">,</span> <span class="keyword">this</span>);

      m_device <span class="operator">=</span> <span class="keyword">new</span> XYSeriesIODevice(m_series<span class="operator">,</span> <span class="keyword">this</span>);
      m_device<span class="operator">-</span><span class="operator">&gt;</span>open(<span class="type">QIODevice</span><span class="operator">::</span>WriteOnly);

      m_audioInput<span class="operator">-</span><span class="operator">&gt;</span>start(m_device);
  }

  Widget<span class="operator">::</span><span class="operator">~</span>Widget()
  {
      m_audioInput<span class="operator">-</span><span class="operator">&gt;</span>stop();
      m_device<span class="operator">-</span><span class="operator">&gt;</span>close();
  }

</pre>
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<!-- @@@audio/widget.cpp -->
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