<?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>videosettings.cpp Example File | Qt Multimedia 5.11</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 ><a href="../qtdoc/index.html">Qt 5.11</a></td><td ><a href="qtmultimedia-index.html">Qt Multimedia</a></td><td ><a href="qtmultimedia-multimediawidgets-camera-example.html">Camera Example</a></td><td >videosettings.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.11.2 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">videosettings.cpp Example File</h1> <span class="subtitle">multimediawidgets/camera/videosettings.cpp</span> <!-- $$$multimediawidgets/camera/videosettings.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 "videosettings.h"</span> <span class="preprocessor">#include "ui_videosettings.h"</span> <span class="preprocessor">#include <QComboBox></span> <span class="preprocessor">#include <QDebug></span> <span class="preprocessor">#include <QMediaRecorder></span> <span class="preprocessor">#include <QMediaService></span> VideoSettings<span class="operator">::</span>VideoSettings(<span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span> <span class="operator">*</span>mediaRecorder<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="../qtwidgets/qdialog.html">QDialog</a></span>(parent)<span class="operator">,</span> ui(<span class="keyword">new</span> Ui<span class="operator">::</span>VideoSettingsUi)<span class="operator">,</span> mediaRecorder(mediaRecorder) { ui<span class="operator">-</span><span class="operator">></span>setupUi(<span class="keyword">this</span>); <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 audio codec"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>())); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> supportedAudioCodecs <span class="operator">=</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>supportedAudioCodecs(); <span class="keyword">for</span> (<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>codecName : supportedAudioCodecs) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> description <span class="operator">=</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>audioCodecDescription(codecName); 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="string">": "</span> <span class="operator">+</span> description<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(codecName)); } <span class="comment">//sample rate:</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type">int</span><span class="operator">></span>supportedAudioSampleRates <span class="operator">=</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>supportedAudioSampleRates(); <span class="keyword">for</span> (<span class="type">int</span> sampleRate : supportedAudioSampleRates) ui<span class="operator">-</span><span class="operator">></span>audioSampleRateBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>number(sampleRate)<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(sampleRate)); ui<span class="operator">-</span><span class="operator">></span>audioQualitySlider<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)); <span class="comment">//video codecs</span> ui<span class="operator">-</span><span class="operator">></span>videoCodecBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Default video codec"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>())); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> supportedVideoCodecs <span class="operator">=</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>supportedVideoCodecs(); <span class="keyword">for</span> (<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>codecName : supportedVideoCodecs) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> description <span class="operator">=</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>videoCodecDescription(codecName); ui<span class="operator">-</span><span class="operator">></span>videoCodecBox<span class="operator">-</span><span class="operator">></span>addItem(codecName <span class="operator">+</span> <span class="string">": "</span> <span class="operator">+</span> description<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(codecName)); } ui<span class="operator">-</span><span class="operator">></span>videoQualitySlider<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>videoResolutionBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Default"</span>)); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qsize.html">QSize</a></span><span class="operator">></span> supportedResolutions <span class="operator">=</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>supportedResolutions(); <span class="keyword">for</span> (<span class="keyword">const</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> <span class="operator">&</span>resolution : supportedResolutions) { ui<span class="operator">-</span><span class="operator">></span>videoResolutionBox<span class="operator">-</span><span class="operator">></span>addItem(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"%1x%2"</span>)<span class="operator">.</span>arg(resolution<span class="operator">.</span>width())<span class="operator">.</span>arg(resolution<span class="operator">.</span>height())<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(resolution)); } ui<span class="operator">-</span><span class="operator">></span>videoFramerateBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Default"</span>)); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span><span class="operator">></span> supportedFrameRates <span class="operator">=</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>supportedFrameRates(); <span class="keyword">for</span> (<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> rate : supportedFrameRates) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> rateString <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"%1"</span>)<span class="operator">.</span>arg(rate<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="char">'f'</span><span class="operator">,</span> <span class="number">2</span>); ui<span class="operator">-</span><span class="operator">></span>videoFramerateBox<span class="operator">-</span><span class="operator">></span>addItem(rateString<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(rate)); } <span class="comment">//containers</span> ui<span class="operator">-</span><span class="operator">></span>containerFormatBox<span class="operator">-</span><span class="operator">></span>addItem(tr(<span class="string">"Default container"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>())); <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> formats <span class="operator">=</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>supportedContainers(); <span class="keyword">for</span> (<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>format : formats) { ui<span class="operator">-</span><span class="operator">></span>containerFormatBox<span class="operator">-</span><span class="operator">></span>addItem(format <span class="operator">+</span> <span class="string">": "</span> <span class="operator">+</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>containerDescription(format)<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(format)); } } VideoSettings<span class="operator">::</span><span class="operator">~</span>VideoSettings() { <span class="keyword">delete</span> ui; } <span class="type">void</span> VideoSettings<span class="operator">::</span>changeEvent(<span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>e) { <span class="type"><a href="../qtwidgets/qdialog.html">QDialog</a></span><span class="operator">::</span>changeEvent(e); <span class="keyword">switch</span> (e<span class="operator">-</span><span class="operator">></span>type()) { <span class="keyword">case</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>LanguageChange: ui<span class="operator">-</span><span class="operator">></span>retranslateUi(<span class="keyword">this</span>); <span class="keyword">break</span>; <span class="keyword">default</span>: <span class="keyword">break</span>; } } <span class="type"><a href="qaudioencodersettings.html">QAudioEncoderSettings</a></span> VideoSettings<span class="operator">::</span>audioSettings() <span class="keyword">const</span> { <span class="type"><a href="qaudioencodersettings.html">QAudioEncoderSettings</a></span> settings <span class="operator">=</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>audioSettings(); 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>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>audioQualitySlider<span class="operator">-</span><span class="operator">></span>value())); settings<span class="operator">.</span>setSampleRate(boxValue(ui<span class="operator">-</span><span class="operator">></span>audioSampleRateBox)<span class="operator">.</span>toInt()); <span class="keyword">return</span> settings; } <span class="type">void</span> VideoSettings<span class="operator">::</span>setAudioSettings(<span class="keyword">const</span> <span class="type"><a href="qaudioencodersettings.html">QAudioEncoderSettings</a></span> <span class="operator">&</span>audioSettings) { selectComboBoxItem(ui<span class="operator">-</span><span class="operator">></span>audioCodecBox<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(audioSettings<span class="operator">.</span>codec())); selectComboBoxItem(ui<span class="operator">-</span><span class="operator">></span>audioSampleRateBox<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(audioSettings<span class="operator">.</span>sampleRate())); ui<span class="operator">-</span><span class="operator">></span>audioQualitySlider<span class="operator">-</span><span class="operator">></span>setValue(audioSettings<span class="operator">.</span>quality()); } <span class="type"><a href="qvideoencodersettings.html">QVideoEncoderSettings</a></span> VideoSettings<span class="operator">::</span>videoSettings() <span class="keyword">const</span> { <span class="type"><a href="qvideoencodersettings.html">QVideoEncoderSettings</a></span> settings <span class="operator">=</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>videoSettings(); settings<span class="operator">.</span>setCodec(boxValue(ui<span class="operator">-</span><span class="operator">></span>videoCodecBox)<span class="operator">.</span>toString()); 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>videoQualitySlider<span class="operator">-</span><span class="operator">></span>value())); settings<span class="operator">.</span>setResolution(boxValue(ui<span class="operator">-</span><span class="operator">></span>videoResolutionBox)<span class="operator">.</span>toSize()); settings<span class="operator">.</span>setFrameRate(boxValue(ui<span class="operator">-</span><span class="operator">></span>videoFramerateBox)<span class="operator">.</span>value<span class="operator"><</span><span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span><span class="operator">></span>()); <span class="keyword">return</span> settings; } <span class="type">void</span> VideoSettings<span class="operator">::</span>setVideoSettings(<span class="keyword">const</span> <span class="type"><a href="qvideoencodersettings.html">QVideoEncoderSettings</a></span> <span class="operator">&</span>videoSettings) { selectComboBoxItem(ui<span class="operator">-</span><span class="operator">></span>videoCodecBox<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(videoSettings<span class="operator">.</span>codec())); selectComboBoxItem(ui<span class="operator">-</span><span class="operator">></span>videoResolutionBox<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(videoSettings<span class="operator">.</span>resolution())); ui<span class="operator">-</span><span class="operator">></span>videoQualitySlider<span class="operator">-</span><span class="operator">></span>setValue(videoSettings<span class="operator">.</span>quality()); <span class="comment">//special case for frame rate</span> <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> ui<span class="operator">-</span><span class="operator">></span>videoFramerateBox<span class="operator">-</span><span class="operator">></span>count(); <span class="operator">+</span><span class="operator">+</span>i) { <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> itemRate <span class="operator">=</span> ui<span class="operator">-</span><span class="operator">></span>videoFramerateBox<span class="operator">-</span><span class="operator">></span>itemData(i)<span class="operator">.</span>value<span class="operator"><</span><span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span><span class="operator">></span>(); <span class="keyword">if</span> (<a href="../qtcore/qfloat16.html#qFuzzyCompare">qFuzzyCompare</a>(itemRate<span class="operator">,</span> videoSettings<span class="operator">.</span>frameRate())) { ui<span class="operator">-</span><span class="operator">></span>videoFramerateBox<span class="operator">-</span><span class="operator">></span>setCurrentIndex(i); <span class="keyword">break</span>; } } } <span class="type"><a href="../qtcore/qstring.html">QString</a></span> VideoSettings<span class="operator">::</span>format() <span class="keyword">const</span> { <span class="keyword">return</span> boxValue(ui<span class="operator">-</span><span class="operator">></span>containerFormatBox)<span class="operator">.</span>toString(); } <span class="type">void</span> VideoSettings<span class="operator">::</span>setFormat(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>format) { selectComboBoxItem(ui<span class="operator">-</span><span class="operator">></span>containerFormatBox<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(format)); } <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> VideoSettings<span class="operator">::</span>boxValue(<span class="keyword">const</span> <span class="type"><a href="../qtwidgets/qcombobox.html">QComboBox</a></span> <span class="operator">*</span>box) <span class="keyword">const</span> { <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"><a href="../qtcore/qvariant.html">QVariant</a></span>(); <span class="keyword">return</span> box<span class="operator">-</span><span class="operator">></span>itemData(idx); } <span class="type">void</span> VideoSettings<span class="operator">::</span>selectComboBoxItem(<span class="type"><a href="../qtwidgets/qcombobox.html">QComboBox</a></span> <span class="operator">*</span>box<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> <span class="operator">&</span>value) { <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> box<span class="operator">-</span><span class="operator">></span>count(); <span class="operator">+</span><span class="operator">+</span>i) { <span class="keyword">if</span> (box<span class="operator">-</span><span class="operator">></span>itemData(i) <span class="operator">=</span><span class="operator">=</span> value) { box<span class="operator">-</span><span class="operator">></span>setCurrentIndex(i); <span class="keyword">break</span>; } } } </pre> </div> <!-- @@@multimediawidgets/camera/videosettings.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2018 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>