<?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 5.12.6</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 5.12</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"><a href="qtmultimedia-index.html">Qt 5.12.6 Reference Documentation</a></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: ** ** "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 "audiorecorder.h"</span> <span class="preprocessor">#include "audiolevel.h"</span> <span class="preprocessor">#include "ui_audiorecorder.h"</span> <span class="preprocessor">#include <QAudioProbe></span> <span class="preprocessor">#include <QAudioRecorder></span> <span class="preprocessor">#include <QDir></span> <span class="preprocessor">#include <QFileDialog></span> <span class="preprocessor">#include <QMediaRecorder></span> <span class="preprocessor">#include <QStandardPaths></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">&</span>format); <span class="keyword">static</span> <span class="type">QVector</span><span class="operator"><</span><span class="type">qreal</span><span class="operator">></span> getBufferLevels(<span class="keyword">const</span> <span class="type"><a href="qaudiobuffer.html">QAudioBuffer</a></span> <span class="operator">&</span>buffer); <span class="keyword">template</span> <span class="operator"><</span><span class="keyword">class</span> T<span class="operator">></span> <span class="keyword">static</span> <span class="type">QVector</span><span class="operator"><</span><span class="type">qreal</span><span class="operator">></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() : ui(<span class="keyword">new</span> Ui<span class="operator">::</span>AudioRecorder) { ui<span class="operator">-</span><span class="operator">></span>setupUi(<span class="keyword">this</span>); m_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>); m_probe <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaudioprobe.html">QAudioProbe</a></span>(<span class="keyword">this</span>); connect(m_probe<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaudioprobe.html">QAudioProbe</a></span><span class="operator">::</span>audioBufferProbed<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>AudioRecorder<span class="operator">::</span>processBuffer); m_probe<span class="operator">-</span><span class="operator">></span>setSource(m_audioRecorder); <span class="comment">//audio devices</span> ui<span class="operator">-</span><span class="operator">></span>audioDeviceBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Default"</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="type">QString</span>())); <span class="keyword">for</span> (<span class="keyword">auto</span> <span class="operator">&</span>device: m_audioRecorder<span class="operator">-</span><span class="operator">></span>audioInputs()) { ui<span class="operator">-</span><span class="operator">></span>audioDeviceBox<span class="operator">-</span><span class="operator">></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">></span>audioCodecBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Default"</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="type">QString</span>())); <span class="keyword">for</span> (<span class="keyword">auto</span> <span class="operator">&</span>codecName: m_audioRecorder<span class="operator">-</span><span class="operator">></span>supportedAudioCodecs()) { ui<span class="operator">-</span><span class="operator">></span>audioCodecBox<span class="operator">-</span><span class="operator">></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">></span>containerBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Default"</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="type">QString</span>())); <span class="keyword">for</span> (<span class="keyword">auto</span> <span class="operator">&</span>containerName: m_audioRecorder<span class="operator">-</span><span class="operator">></span>supportedContainers()) { ui<span class="operator">-</span><span class="operator">></span>containerBox<span class="operator">-</span><span class="operator">></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">></span>sampleRateBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Default"</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">0</span>)); <span class="keyword">for</span> (<span class="type">int</span> sampleRate: m_audioRecorder<span class="operator">-</span><span class="operator">></span>supportedAudioSampleRates()) { ui<span class="operator">-</span><span class="operator">></span>sampleRateBox<span class="operator">-</span><span class="operator">></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">></span>channelsBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Default"</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">></span>channelsBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="type">QStringLiteral</span>(<span class="string">"1"</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">1</span>)); ui<span class="operator">-</span><span class="operator">></span>channelsBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="type">QStringLiteral</span>(<span class="string">"2"</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">2</span>)); ui<span class="operator">-</span><span class="operator">></span>channelsBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="type">QStringLiteral</span>(<span class="string">"4"</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">></span>qualitySlider<span class="operator">-</span><span class="operator">></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">></span>qualitySlider<span class="operator">-</span><span class="operator">></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">></span>bitrateBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Default"</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">0</span>)); ui<span class="operator">-</span><span class="operator">></span>bitrateBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="type">QStringLiteral</span>(<span class="string">"32000"</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">32000</span>)); ui<span class="operator">-</span><span class="operator">></span>bitrateBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="type">QStringLiteral</span>(<span class="string">"64000"</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">64000</span>)); ui<span class="operator">-</span><span class="operator">></span>bitrateBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="type">QStringLiteral</span>(<span class="string">"96000"</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">96000</span>)); ui<span class="operator">-</span><span class="operator">></span>bitrateBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="type">QStringLiteral</span>(<span class="string">"128000"</span>)<span class="operator">,</span> <span class="type">QVariant</span>(<span class="number">128000</span>)); connect(m_audioRecorder<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaudiorecorder.html">QAudioRecorder</a></span><span class="operator">::</span>durationChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>AudioRecorder<span class="operator">::</span>updateProgress); connect(m_audioRecorder<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaudiorecorder.html">QAudioRecorder</a></span><span class="operator">::</span>statusChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>AudioRecorder<span class="operator">::</span>updateStatus); connect(m_audioRecorder<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qaudiorecorder.html">QAudioRecorder</a></span><span class="operator">::</span>stateChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>AudioRecorder<span class="operator">::</span>onStateChanged); connect(m_audioRecorder<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>Error<span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qaudiorecorder.html">QAudioRecorder</a></span><span class="operator">::</span>error)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>AudioRecorder<span class="operator">::</span>displayErrorMessage); } <span class="type">void</span> AudioRecorder<span class="operator">::</span>updateProgress(<span class="type">qint64</span> duration) { <span class="keyword">if</span> (m_audioRecorder<span class="operator">-</span><span class="operator">></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"><</span> <span class="number">2000</span>) <span class="keyword">return</span>; ui<span class="operator">-</span><span class="operator">></span>statusbar<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"Recorded %1 sec"</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">"Recording to %1"</span>)<span class="operator">.</span>arg(m_audioRecorder<span class="operator">-</span><span class="operator">></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">"Paused"</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">"Stopped"</span>); <span class="keyword">default</span>: <span class="keyword">break</span>; } <span class="keyword">if</span> (m_audioRecorder<span class="operator">-</span><span class="operator">></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">></span>statusbar<span class="operator">-</span><span class="operator">></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">></span>recordButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Stop"</span>)); ui<span class="operator">-</span><span class="operator">></span>pauseButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Pause"</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">></span>recordButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Stop"</span>)); ui<span class="operator">-</span><span class="operator">></span>pauseButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Resume"</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">></span>recordButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Record"</span>)); ui<span class="operator">-</span><span class="operator">></span>pauseButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Pause"</span>)); <span class="keyword">break</span>; } ui<span class="operator">-</span><span class="operator">></span>pauseButton<span class="operator">-</span><span class="operator">></span>setEnabled(m_audioRecorder<span class="operator">-</span><span class="operator">></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">></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">></span>itemData(idx); } <span class="type">void</span> AudioRecorder<span class="operator">::</span>toggleRecord() { <span class="keyword">if</span> (m_audioRecorder<span class="operator">-</span><span class="operator">></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) { m_audioRecorder<span class="operator">-</span><span class="operator">></span>setAudioInput(boxValue(ui<span class="operator">-</span><span class="operator">></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">></span>audioCodecBox)<span class="operator">.</span>toString()); settings<span class="operator">.</span>setSampleRate(boxValue(ui<span class="operator">-</span><span class="operator">></span>sampleRateBox)<span class="operator">.</span>toInt()); settings<span class="operator">.</span>setBitRate(boxValue(ui<span class="operator">-</span><span class="operator">></span>bitrateBox)<span class="operator">.</span>toInt()); settings<span class="operator">.</span>setChannelCount(boxValue(ui<span class="operator">-</span><span class="operator">></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">></span>qualitySlider<span class="operator">-</span><span class="operator">></span>value())); settings<span class="operator">.</span>setEncodingMode(ui<span class="operator">-</span><span class="operator">></span>constantQualityRadioButton<span class="operator">-</span><span class="operator">></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">></span>containerBox)<span class="operator">.</span>toString(); m_audioRecorder<span class="operator">-</span><span class="operator">></span>setEncodingSettings(settings<span class="operator">,</span> <span class="type"><a href="qvideoencodersettings.html">QVideoEncoderSettings</a></span>()<span class="operator">,</span> container); m_audioRecorder<span class="operator">-</span><span class="operator">></span>record(); } <span class="keyword">else</span> { m_audioRecorder<span class="operator">-</span><span class="operator">></span>stop(); } } <span class="type">void</span> AudioRecorder<span class="operator">::</span>togglePause() { <span class="keyword">if</span> (m_audioRecorder<span class="operator">-</span><span class="operator">></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) m_audioRecorder<span class="operator">-</span><span class="operator">></span>pause(); <span class="keyword">else</span> m_audioRecorder<span class="operator">-</span><span class="operator">></span>record(); } <span class="type">void</span> AudioRecorder<span class="operator">::</span>setOutputLocation() { <span class="preprocessor">#ifdef Q_OS_WINRT</span> <span class="comment">// UWP does not allow to store outside the sandbox</span> <span class="keyword">const</span> <span class="type">QString</span> cacheDir <span class="operator">=</span> <span class="type">QStandardPaths</span><span class="operator">::</span>writableLocation(<span class="type">QStandardPaths</span><span class="operator">::</span>CacheLocation); <span class="keyword">if</span> (<span class="operator">!</span><span class="type">QDir</span>()<span class="operator">.</span>mkpath(cacheDir)) { qWarning() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Failed to create cache directory"</span>; <span class="keyword">return</span>; } <span class="type">QString</span> fileName <span class="operator">=</span> cacheDir <span class="operator">+</span> QLatin1String(<span class="string">"/output.wav"</span>); <span class="preprocessor">#else</span> <span class="type">QString</span> fileName <span class="operator">=</span> <span class="type">QFileDialog</span><span class="operator">::</span>getSaveFileName(); <span class="preprocessor">#endif</span> m_audioRecorder<span class="operator">-</span><span class="operator">></span>setOutputLocation(<span class="type">QUrl</span><span class="operator">::</span>fromLocalFile(fileName)); m_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">></span>statusbar<span class="operator">-</span><span class="operator">></span>showMessage(m_audioRecorder<span class="operator">-</span><span class="operator">></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"><</span> m_audioLevels<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) m_audioLevels<span class="operator">.</span>at(i)<span class="operator">-</span><span class="operator">></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">&</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">"audio/pcm"</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"><</span><span class="type">qreal</span><span class="operator">></span> getBufferLevels(<span class="keyword">const</span> <span class="type"><a href="qaudiobuffer.html">QAudioBuffer</a></span><span class="operator">&</span> buffer) { <span class="type">QVector</span><span class="operator"><</span><span class="type">qreal</span><span class="operator">></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">"audio/pcm"</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"><</span><span class="type">quint32</span><span class="operator">></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"><</span><span class="type">quint16</span><span class="operator">></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"><</span><span class="type">quint8</span><span class="operator">></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"><</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"><</span><span class="type">float</span><span class="operator">></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"><</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"><</span><span class="type">qint32</span><span class="operator">></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"><</span><span class="type">qint16</span><span class="operator">></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"><</span><span class="type">qint8</span><span class="operator">></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"><</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"><</span><span class="keyword">class</span> T<span class="operator">></span> <span class="type">QVector</span><span class="operator"><</span><span class="type">qreal</span><span class="operator">></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"><</span><span class="type">qreal</span><span class="operator">></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"><</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"><</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">></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">&</span> buffer) { <span class="keyword">if</span> (m_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(m_audioLevels); m_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"><</span> buffer<span class="operator">.</span>format()<span class="operator">.</span>channelCount(); <span class="operator">+</span><span class="operator">+</span>i) { AudioLevel <span class="operator">*</span>level <span class="operator">=</span> <span class="keyword">new</span> AudioLevel(ui<span class="operator">-</span><span class="operator">></span>centralwidget); m_audioLevels<span class="operator">.</span>append(level); ui<span class="operator">-</span><span class="operator">></span>levelsLayout<span class="operator">-</span><span class="operator">></span>addWidget(level); } } <span class="type">QVector</span><span class="operator"><</span><span class="type">qreal</span><span class="operator">></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"><</span> levels<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) m_audioLevels<span class="operator">.</span>at(i)<span class="operator">-</span><span class="operator">></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">©</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 of their respective owners. </p> </div> </body> </html>