Sophie

Sophie

distrib > Mageia > 6 > armv5tl > by-pkgid > 9ee5ef51dbf4a00567f58cff4d0e160c > files > 328

qtmultimedia5-doc-5.9.4-1.mga6.noarch.rpm

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>audiorecorder.cpp Example File | Qt Multimedia 5.9</title>
  <link rel="stylesheet" type="text/css" href="style/offline-simple.css" />
  <script type="text/javascript">
    document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css");
    // loading style sheet breaks anchors that were jumped to before
    // so force jumping to anchor again
    setTimeout(function() {
        var anchor = location.hash;
        // need to jump to different anchor first (e.g. none)
        location.hash = "#";
        setTimeout(function() {
            location.hash = anchor;
        }, 0);
    }, 0);
  </script>
</head>
<body>
<div class="header" id="qtdocheader">
  <div class="main">
    <div class="main-rounded">
      <div class="navigationbar">
        <table><tr>
<td >Qt 5.9</td><td ><a href="qtmultimedia-index.html">Qt Multimedia</a></td><td ><a href="qtmultimedia-multimedia-audiorecorder-example.html">Audio Recorder Example</a></td><td >audiorecorder.cpp Example File</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
        </tr></table>
      </div>
    </div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">audiorecorder.cpp Example File</h1>
<span class="subtitle">multimedia/audiorecorder/audiorecorder.cpp</span>
<!-- $$$multimedia/audiorecorder/audiorecorder.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:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &lt;QAudioProbe&gt;</span>
  <span class="preprocessor">#include &lt;QAudioRecorder&gt;</span>
  <span class="preprocessor">#include &lt;QDir&gt;</span>
  <span class="preprocessor">#include &lt;QFileDialog&gt;</span>
  <span class="preprocessor">#include &lt;QMediaRecorder&gt;</span>

  <span class="preprocessor">#include &quot;audiorecorder.h&quot;</span>
  <span class="preprocessor">#include &quot;qaudiolevel.h&quot;</span>

  <span class="preprocessor">#include &quot;ui_audiorecorder.h&quot;</span>

  <span class="keyword">static</span> <span class="type">qreal</span> getPeakValue(<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> <span class="operator">&amp;</span>format);
  <span class="keyword">static</span> <span class="type">QVector</span><span class="operator">&lt;</span><span class="type">qreal</span><span class="operator">&gt;</span> getBufferLevels(<span class="keyword">const</span> <span class="type"><a href="qaudiobuffer.html">QAudioBuffer</a></span> <span class="operator">&amp;</span>buffer);

  <span class="keyword">template</span> <span class="operator">&lt;</span><span class="keyword">class</span> T<span class="operator">&gt;</span>
  <span class="keyword">static</span> <span class="type">QVector</span><span class="operator">&lt;</span><span class="type">qreal</span><span class="operator">&gt;</span> getBufferLevels(<span class="keyword">const</span> T <span class="operator">*</span>buffer<span class="operator">,</span> <span class="type">int</span> frames<span class="operator">,</span> <span class="type">int</span> channels);

  AudioRecorder<span class="operator">::</span>AudioRecorder(<span class="type">QWidget</span> <span class="operator">*</span>parent) :
      <span class="type">QMainWindow</span>(parent)<span class="operator">,</span>
      ui(<span class="keyword">new</span> Ui<span class="operator">::</span>AudioRecorder)<span class="operator">,</span>
      outputLocationSet(<span class="keyword">false</span>)
  {
      ui<span class="operator">-</span><span class="operator">&gt;</span>setupUi(<span class="keyword">this</span>);

      audioRecorder <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaudiorecorder.html">QAudioRecorder</a></span>(<span class="keyword">this</span>);
      probe <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaudioprobe.html">QAudioProbe</a></span>;
      connect(probe<span class="operator">,</span> SIGNAL(audioBufferProbed(<span class="type"><a href="qaudiobuffer.html">QAudioBuffer</a></span>))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(processBuffer(<span class="type"><a href="qaudiobuffer.html">QAudioBuffer</a></span>)));
      probe<span class="operator">-</span><span class="operator">&gt;</span>setSource(audioRecorder);

      <span class="comment">//audio devices</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>audioDeviceBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Default&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="type">QString</span>()));
      foreach (<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>device<span class="operator">,</span> audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>audioInputs()) {
          ui<span class="operator">-</span><span class="operator">&gt;</span>audioDeviceBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(device<span class="operator">,</span> <span class="type">QVariant</span>(device));
      }

      <span class="comment">//audio codecs</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>audioCodecBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Default&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="type">QString</span>()));
      foreach (<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>codecName<span class="operator">,</span> audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>supportedAudioCodecs()) {
          ui<span class="operator">-</span><span class="operator">&gt;</span>audioCodecBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(codecName<span class="operator">,</span> <span class="type">QVariant</span>(codecName));
      }

      <span class="comment">//containers</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>containerBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Default&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="type">QString</span>()));
      foreach (<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>containerName<span class="operator">,</span> audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>supportedContainers()) {
          ui<span class="operator">-</span><span class="operator">&gt;</span>containerBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(containerName<span class="operator">,</span> <span class="type">QVariant</span>(containerName));
      }

      <span class="comment">//sample rate</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>sampleRateBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Default&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">0</span>));
      foreach (<span class="type">int</span> sampleRate<span class="operator">,</span> audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>supportedAudioSampleRates()) {
          ui<span class="operator">-</span><span class="operator">&gt;</span>sampleRateBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="type">QString</span><span class="operator">::</span>number(sampleRate)<span class="operator">,</span> <span class="type">QVariant</span>(
                  sampleRate));
      }

      <span class="comment">//channels</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>channelsBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Default&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="operator">-</span><span class="number">1</span>));
      ui<span class="operator">-</span><span class="operator">&gt;</span>channelsBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="type">QStringLiteral</span>(<span class="string">&quot;1&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">1</span>));
      ui<span class="operator">-</span><span class="operator">&gt;</span>channelsBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="type">QStringLiteral</span>(<span class="string">&quot;2&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">2</span>));
      ui<span class="operator">-</span><span class="operator">&gt;</span>channelsBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="type">QStringLiteral</span>(<span class="string">&quot;4&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">4</span>));

      <span class="comment">//quality</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>qualitySlider<span class="operator">-</span><span class="operator">&gt;</span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="type">int</span>(<span class="type"><a href="qmultimedia.html">QMultimedia</a></span><span class="operator">::</span>VeryHighQuality));
      ui<span class="operator">-</span><span class="operator">&gt;</span>qualitySlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(<span class="type">int</span>(<span class="type"><a href="qmultimedia.html">QMultimedia</a></span><span class="operator">::</span>NormalQuality));

      <span class="comment">//bitrates:</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>bitrateBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Default&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">0</span>));
      ui<span class="operator">-</span><span class="operator">&gt;</span>bitrateBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="type">QStringLiteral</span>(<span class="string">&quot;32000&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">32000</span>));
      ui<span class="operator">-</span><span class="operator">&gt;</span>bitrateBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="type">QStringLiteral</span>(<span class="string">&quot;64000&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">64000</span>));
      ui<span class="operator">-</span><span class="operator">&gt;</span>bitrateBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="type">QStringLiteral</span>(<span class="string">&quot;96000&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">96000</span>));
      ui<span class="operator">-</span><span class="operator">&gt;</span>bitrateBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="type">QStringLiteral</span>(<span class="string">&quot;128000&quot;</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">128000</span>));

      connect(audioRecorder<span class="operator">,</span> SIGNAL(durationChanged(<span class="type">qint64</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span>
              SLOT(updateProgress(<span class="type">qint64</span>)));
      connect(audioRecorder<span class="operator">,</span> SIGNAL(statusChanged(<span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>Status))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span>
              SLOT(updateStatus(<span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>Status)));
      connect(audioRecorder<span class="operator">,</span> SIGNAL(stateChanged(<span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>State))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(onStateChanged(<span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>State)));
      connect(audioRecorder<span class="operator">,</span> SIGNAL(error(<span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>Error))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span>
              SLOT(displayErrorMessage()));
  }

  AudioRecorder<span class="operator">::</span><span class="operator">~</span>AudioRecorder()
  {
      <span class="keyword">delete</span> audioRecorder;
      <span class="keyword">delete</span> probe;
  }

  <span class="type">void</span> AudioRecorder<span class="operator">::</span>updateProgress(<span class="type">qint64</span> duration)
  {
      <span class="keyword">if</span> (audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>error() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>NoError <span class="operator">|</span><span class="operator">|</span> duration <span class="operator">&lt;</span> <span class="number">2000</span>)
          <span class="keyword">return</span>;

      ui<span class="operator">-</span><span class="operator">&gt;</span>statusbar<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;Recorded %1 sec&quot;</span>)<span class="operator">.</span>arg(duration <span class="operator">/</span> <span class="number">1000</span>));
  }

  <span class="type">void</span> AudioRecorder<span class="operator">::</span>updateStatus(<span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>Status status)
  {
      <span class="type">QString</span> statusMessage;

      <span class="keyword">switch</span> (status) {
      <span class="keyword">case</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>RecordingStatus:
          statusMessage <span class="operator">=</span> tr(<span class="string">&quot;Recording to %1&quot;</span>)<span class="operator">.</span>arg(audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>actualLocation()<span class="operator">.</span>toString());
          <span class="keyword">break</span>;
      <span class="keyword">case</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>PausedStatus:
          clearAudioLevels();
          statusMessage <span class="operator">=</span> tr(<span class="string">&quot;Paused&quot;</span>);
          <span class="keyword">break</span>;
      <span class="keyword">case</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>UnloadedStatus:
      <span class="keyword">case</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>LoadedStatus:
          clearAudioLevels();
          statusMessage <span class="operator">=</span> tr(<span class="string">&quot;Stopped&quot;</span>);
      <span class="keyword">default</span>:
          <span class="keyword">break</span>;
      }

      <span class="keyword">if</span> (audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>error() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>NoError)
          ui<span class="operator">-</span><span class="operator">&gt;</span>statusbar<span class="operator">-</span><span class="operator">&gt;</span>showMessage(statusMessage);
  }

  <span class="type">void</span> AudioRecorder<span class="operator">::</span>onStateChanged(<span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>State state)
  {
      <span class="keyword">switch</span> (state) {
      <span class="keyword">case</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>RecordingState:
          ui<span class="operator">-</span><span class="operator">&gt;</span>recordButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Stop&quot;</span>));
          ui<span class="operator">-</span><span class="operator">&gt;</span>pauseButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Pause&quot;</span>));
          <span class="keyword">break</span>;
      <span class="keyword">case</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>PausedState:
          ui<span class="operator">-</span><span class="operator">&gt;</span>recordButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Stop&quot;</span>));
          ui<span class="operator">-</span><span class="operator">&gt;</span>pauseButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Resume&quot;</span>));
          <span class="keyword">break</span>;
      <span class="keyword">case</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>StoppedState:
          ui<span class="operator">-</span><span class="operator">&gt;</span>recordButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Record&quot;</span>));
          ui<span class="operator">-</span><span class="operator">&gt;</span>pauseButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Pause&quot;</span>));
          <span class="keyword">break</span>;
      }

      ui<span class="operator">-</span><span class="operator">&gt;</span>pauseButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>StoppedState);
  }

  <span class="keyword">static</span> <span class="type">QVariant</span> boxValue(<span class="keyword">const</span> <span class="type">QComboBox</span> <span class="operator">*</span>box)
  {
      <span class="type">int</span> idx <span class="operator">=</span> box<span class="operator">-</span><span class="operator">&gt;</span>currentIndex();
      <span class="keyword">if</span> (idx <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
          <span class="keyword">return</span> <span class="type">QVariant</span>();

      <span class="keyword">return</span> box<span class="operator">-</span><span class="operator">&gt;</span>itemData(idx);
  }

  <span class="type">void</span> AudioRecorder<span class="operator">::</span>toggleRecord()
  {
      <span class="keyword">if</span> (audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>StoppedState) {
          audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>setAudioInput(boxValue(ui<span class="operator">-</span><span class="operator">&gt;</span>audioDeviceBox)<span class="operator">.</span>toString());

          <span class="type"><a href="qaudioencodersettings.html">QAudioEncoderSettings</a></span> settings;
          settings<span class="operator">.</span>setCodec(boxValue(ui<span class="operator">-</span><span class="operator">&gt;</span>audioCodecBox)<span class="operator">.</span>toString());
          settings<span class="operator">.</span>setSampleRate(boxValue(ui<span class="operator">-</span><span class="operator">&gt;</span>sampleRateBox)<span class="operator">.</span>toInt());
          settings<span class="operator">.</span>setBitRate(boxValue(ui<span class="operator">-</span><span class="operator">&gt;</span>bitrateBox)<span class="operator">.</span>toInt());
          settings<span class="operator">.</span>setChannelCount(boxValue(ui<span class="operator">-</span><span class="operator">&gt;</span>channelsBox)<span class="operator">.</span>toInt());
          settings<span class="operator">.</span>setQuality(<span class="type"><a href="qmultimedia.html">QMultimedia</a></span><span class="operator">::</span>EncodingQuality(ui<span class="operator">-</span><span class="operator">&gt;</span>qualitySlider<span class="operator">-</span><span class="operator">&gt;</span>value()));
          settings<span class="operator">.</span>setEncodingMode(ui<span class="operator">-</span><span class="operator">&gt;</span>constantQualityRadioButton<span class="operator">-</span><span class="operator">&gt;</span>isChecked() <span class="operator">?</span>
                                   <span class="type"><a href="qmultimedia.html">QMultimedia</a></span><span class="operator">::</span>ConstantQualityEncoding :
                                   <span class="type"><a href="qmultimedia.html">QMultimedia</a></span><span class="operator">::</span>ConstantBitRateEncoding);

          <span class="type">QString</span> container <span class="operator">=</span> boxValue(ui<span class="operator">-</span><span class="operator">&gt;</span>containerBox)<span class="operator">.</span>toString();

          audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>setEncodingSettings(settings<span class="operator">,</span> <span class="type"><a href="qvideoencodersettings.html">QVideoEncoderSettings</a></span>()<span class="operator">,</span> container);
          audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>record();
      }
      <span class="keyword">else</span> {
          audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>stop();
      }
  }

  <span class="type">void</span> AudioRecorder<span class="operator">::</span>togglePause()
  {
      <span class="keyword">if</span> (audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>PausedState)
          audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>pause();
      <span class="keyword">else</span>
          audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>record();
  }

  <span class="type">void</span> AudioRecorder<span class="operator">::</span>setOutputLocation()
  {
      <span class="type">QString</span> fileName <span class="operator">=</span> <span class="type">QFileDialog</span><span class="operator">::</span>getSaveFileName();
      audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>setOutputLocation(<span class="type">QUrl</span><span class="operator">::</span>fromLocalFile(fileName));
      outputLocationSet <span class="operator">=</span> <span class="keyword">true</span>;
  }

  <span class="type">void</span> AudioRecorder<span class="operator">::</span>displayErrorMessage()
  {
      ui<span class="operator">-</span><span class="operator">&gt;</span>statusbar<span class="operator">-</span><span class="operator">&gt;</span>showMessage(audioRecorder<span class="operator">-</span><span class="operator">&gt;</span>errorString());
  }

  <span class="type">void</span> AudioRecorder<span class="operator">::</span>clearAudioLevels()
  {
      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> audioLevels<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i)
          audioLevels<span class="operator">.</span>at(i)<span class="operator">-</span><span class="operator">&gt;</span>setLevel(<span class="number">0</span>);
  }

  <span class="comment">// This function returns the maximum possible sample value for a given audio format</span>
  <span class="type">qreal</span> getPeakValue(<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">&amp;</span> format)
  {
      <span class="comment">// Note: Only the most common sample formats are supported</span>
      <span class="keyword">if</span> (<span class="operator">!</span>format<span class="operator">.</span>isValid())
          <span class="keyword">return</span> <span class="type">qreal</span>(<span class="number">0</span>);

      <span class="keyword">if</span> (format<span class="operator">.</span>codec() <span class="operator">!</span><span class="operator">=</span> <span class="string">&quot;audio/pcm&quot;</span>)
          <span class="keyword">return</span> <span class="type">qreal</span>(<span class="number">0</span>);

      <span class="keyword">switch</span> (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>Unknown:
          <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:
          <span class="keyword">if</span> (format<span class="operator">.</span>sampleSize() <span class="operator">!</span><span class="operator">=</span> <span class="number">32</span>) <span class="comment">// other sample formats are not supported</span>
              <span class="keyword">return</span> <span class="type">qreal</span>(<span class="number">0</span>);
          <span class="keyword">return</span> <span class="type">qreal</span>(<span class="number">1.00003</span>);
      <span class="keyword">case</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>SignedInt:
          <span class="keyword">if</span> (format<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">32</span>)
              <span class="keyword">return</span> <span class="type">qreal</span>(INT_MAX);
          <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="keyword">return</span> <span class="type">qreal</span>(SHRT_MAX);
          <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="keyword">return</span> <span class="type">qreal</span>(CHAR_MAX);
          <span class="keyword">break</span>;
      <span class="keyword">case</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>UnSignedInt:
          <span class="keyword">if</span> (format<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">32</span>)
              <span class="keyword">return</span> <span class="type">qreal</span>(UINT_MAX);
          <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="keyword">return</span> <span class="type">qreal</span>(USHRT_MAX);
          <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="keyword">return</span> <span class="type">qreal</span>(UCHAR_MAX);
          <span class="keyword">break</span>;
      }

      <span class="keyword">return</span> <span class="type">qreal</span>(<span class="number">0</span>);
  }

  <span class="comment">// returns the audio level for each channel</span>
  <span class="type">QVector</span><span class="operator">&lt;</span><span class="type">qreal</span><span class="operator">&gt;</span> getBufferLevels(<span class="keyword">const</span> <span class="type"><a href="qaudiobuffer.html">QAudioBuffer</a></span><span class="operator">&amp;</span> buffer)
  {
      <span class="type">QVector</span><span class="operator">&lt;</span><span class="type">qreal</span><span class="operator">&gt;</span> values;

      <span class="keyword">if</span> (<span class="operator">!</span>buffer<span class="operator">.</span>format()<span class="operator">.</span>isValid() <span class="operator">|</span><span class="operator">|</span> buffer<span class="operator">.</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)
          <span class="keyword">return</span> values;

      <span class="keyword">if</span> (buffer<span class="operator">.</span>format()<span class="operator">.</span>codec() <span class="operator">!</span><span class="operator">=</span> <span class="string">&quot;audio/pcm&quot;</span>)
          <span class="keyword">return</span> values;

      <span class="type">int</span> channelCount <span class="operator">=</span> buffer<span class="operator">.</span>format()<span class="operator">.</span>channelCount();
      values<span class="operator">.</span>fill(<span class="number">0</span><span class="operator">,</span> channelCount);
      <span class="type">qreal</span> peak_value <span class="operator">=</span> getPeakValue(buffer<span class="operator">.</span>format());
      <span class="keyword">if</span> (qFuzzyCompare(peak_value<span class="operator">,</span> <span class="type">qreal</span>(<span class="number">0</span>)))
          <span class="keyword">return</span> values;

      <span class="keyword">switch</span> (buffer<span class="operator">.</span>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>Unknown:
      <span class="keyword">case</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span><span class="operator">::</span>UnSignedInt:
          <span class="keyword">if</span> (buffer<span class="operator">.</span>format()<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">32</span>)
              values <span class="operator">=</span> getBufferLevels(buffer<span class="operator">.</span>constData<span class="operator">&lt;</span><span class="type">quint32</span><span class="operator">&gt;</span>()<span class="operator">,</span> buffer<span class="operator">.</span>frameCount()<span class="operator">,</span> channelCount);
          <span class="keyword">if</span> (buffer<span class="operator">.</span>format()<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">16</span>)
              values <span class="operator">=</span> getBufferLevels(buffer<span class="operator">.</span>constData<span class="operator">&lt;</span><span class="type">quint16</span><span class="operator">&gt;</span>()<span class="operator">,</span> buffer<span class="operator">.</span>frameCount()<span class="operator">,</span> channelCount);
          <span class="keyword">if</span> (buffer<span class="operator">.</span>format()<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">8</span>)
              values <span class="operator">=</span> getBufferLevels(buffer<span class="operator">.</span>constData<span class="operator">&lt;</span><span class="type">quint8</span><span class="operator">&gt;</span>()<span class="operator">,</span> buffer<span class="operator">.</span>frameCount()<span class="operator">,</span> channelCount);
          <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> values<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i)
              values<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> qAbs(values<span class="operator">.</span>at(i) <span class="operator">-</span> peak_value <span class="operator">/</span> <span class="number">2</span>) <span class="operator">/</span> (peak_value <span class="operator">/</span> <span class="number">2</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:
          <span class="keyword">if</span> (buffer<span class="operator">.</span>format()<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">32</span>) {
              values <span class="operator">=</span> getBufferLevels(buffer<span class="operator">.</span>constData<span class="operator">&lt;</span><span class="type">float</span><span class="operator">&gt;</span>()<span class="operator">,</span> buffer<span class="operator">.</span>frameCount()<span class="operator">,</span> channelCount);
              <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> values<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i)
                  values<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">/</span><span class="operator">=</span> peak_value;
          }
          <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:
          <span class="keyword">if</span> (buffer<span class="operator">.</span>format()<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">32</span>)
              values <span class="operator">=</span> getBufferLevels(buffer<span class="operator">.</span>constData<span class="operator">&lt;</span><span class="type">qint32</span><span class="operator">&gt;</span>()<span class="operator">,</span> buffer<span class="operator">.</span>frameCount()<span class="operator">,</span> channelCount);
          <span class="keyword">if</span> (buffer<span class="operator">.</span>format()<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">16</span>)
              values <span class="operator">=</span> getBufferLevels(buffer<span class="operator">.</span>constData<span class="operator">&lt;</span><span class="type">qint16</span><span class="operator">&gt;</span>()<span class="operator">,</span> buffer<span class="operator">.</span>frameCount()<span class="operator">,</span> channelCount);
          <span class="keyword">if</span> (buffer<span class="operator">.</span>format()<span class="operator">.</span>sampleSize() <span class="operator">=</span><span class="operator">=</span> <span class="number">8</span>)
              values <span class="operator">=</span> getBufferLevels(buffer<span class="operator">.</span>constData<span class="operator">&lt;</span><span class="type">qint8</span><span class="operator">&gt;</span>()<span class="operator">,</span> buffer<span class="operator">.</span>frameCount()<span class="operator">,</span> channelCount);
          <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> values<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i)
              values<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">/</span><span class="operator">=</span> peak_value;
          <span class="keyword">break</span>;
      }

      <span class="keyword">return</span> values;
  }

  <span class="keyword">template</span> <span class="operator">&lt;</span><span class="keyword">class</span> T<span class="operator">&gt;</span>
  <span class="type">QVector</span><span class="operator">&lt;</span><span class="type">qreal</span><span class="operator">&gt;</span> getBufferLevels(<span class="keyword">const</span> T <span class="operator">*</span>buffer<span class="operator">,</span> <span class="type">int</span> frames<span class="operator">,</span> <span class="type">int</span> channels)
  {
      <span class="type">QVector</span><span class="operator">&lt;</span><span class="type">qreal</span><span class="operator">&gt;</span> max_values;
      max_values<span class="operator">.</span>fill(<span class="number">0</span><span class="operator">,</span> channels);

      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> frames; <span class="operator">+</span><span class="operator">+</span>i) {
          <span class="keyword">for</span> (<span class="type">int</span> j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator">&lt;</span> channels; <span class="operator">+</span><span class="operator">+</span>j) {
              <span class="type">qreal</span> value <span class="operator">=</span> qAbs(<span class="type">qreal</span>(buffer<span class="operator">[</span>i <span class="operator">*</span> channels <span class="operator">+</span> j<span class="operator">]</span>));
              <span class="keyword">if</span> (value <span class="operator">&gt;</span> max_values<span class="operator">.</span>at(j))
                  max_values<span class="operator">.</span>replace(j<span class="operator">,</span> value);
          }
      }

      <span class="keyword">return</span> max_values;
  }

  <span class="type">void</span> AudioRecorder<span class="operator">::</span>processBuffer(<span class="keyword">const</span> <span class="type"><a href="qaudiobuffer.html">QAudioBuffer</a></span><span class="operator">&amp;</span> buffer)
  {
      <span class="keyword">if</span> (audioLevels<span class="operator">.</span>count() <span class="operator">!</span><span class="operator">=</span> buffer<span class="operator">.</span>format()<span class="operator">.</span>channelCount()) {
          qDeleteAll(audioLevels);
          audioLevels<span class="operator">.</span>clear();
          <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> buffer<span class="operator">.</span>format()<span class="operator">.</span>channelCount(); <span class="operator">+</span><span class="operator">+</span>i) {
              <span class="type">QAudioLevel</span> <span class="operator">*</span>level <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QAudioLevel</span>(ui<span class="operator">-</span><span class="operator">&gt;</span>centralwidget);
              audioLevels<span class="operator">.</span>append(level);
              ui<span class="operator">-</span><span class="operator">&gt;</span>levelsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(level);
          }
      }

      <span class="type">QVector</span><span class="operator">&lt;</span><span class="type">qreal</span><span class="operator">&gt;</span> levels <span class="operator">=</span> getBufferLevels(buffer);
      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> levels<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i)
          audioLevels<span class="operator">.</span>at(i)<span class="operator">-</span><span class="operator">&gt;</span>setLevel(levels<span class="operator">.</span>at(i));
  }

</pre>
</div>
<!-- @@@multimedia/audiorecorder/audiorecorder.cpp -->
        </div>
       </div>
   </div>
   </div>
</div>
<div class="footer">
   <p>
   <acronym title="Copyright">&copy;</acronym> 2017 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
   of their respective owners. </p>
</div>
</body>
</html>

Perl :: Catalyst :: PostgreSQL :: RPM Valid HTML 4.01 Transitional