<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- multimediabackend.qdoc --> <title>Multimedia Backend Development | 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 >Multimedia Backend Development</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="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#overview">Overview</a></li> <li class="level2"><a href="#classes-for-service-implementers">Classes for service implementers.</a></li> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">Multimedia Backend Development</h1> <span class="subtitle"></span> <!-- $$$multimediabackend.html-description --> <div class="descr"> <a name="details"></a> <a name="overview"></a> <h2 id="overview">Overview</h2> <p>A multimedia backend provides the glue between platform-specific libraries, and Qt Multimedia. In some cases the available cross-platform Multimedia APIs or implementations are not sufficient, or not immediately available on a certain platform. Alternatively, the multimedia implementation on a platform might expose certain extra properties or functionality that other platforms do not, or a finer degree of control might be possible. For these cases, it is possible to use extended controls directly.</p> <a name="classes-for-service-implementers"></a> <h3 >Classes for service implementers.</h3> <div class="table"><table class="annotated"> <tr class="odd topAlign"><td class="tblName"><p><a href="qaudiodecodercontrol.html">QAudioDecoderControl</a></p></td><td class="tblDescr"><p>Access to the audio decoding functionality of a QMediaService</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qaudioencodersettingscontrol.html">QAudioEncoderSettingsControl</a></p></td><td class="tblDescr"><p>Access to the settings of a media service that performs audio encoding</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qaudioinputselectorcontrol.html">QAudioInputSelectorControl</a></p></td><td class="tblDescr"><p>Audio input selector media control</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qaudiooutputselectorcontrol.html">QAudioOutputSelectorControl</a></p></td><td class="tblDescr"><p>Audio output selector media control</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qaudiorolecontrol.html">QAudioRoleControl</a></p></td><td class="tblDescr"><p>Control over the audio role of a media object</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qcameracapturebufferformatcontrol.html">QCameraCaptureBufferFormatControl</a></p></td><td class="tblDescr"><p>Control for setting the capture buffer format</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qcameracapturedestinationcontrol.html">QCameraCaptureDestinationControl</a></p></td><td class="tblDescr"><p>Control for setting capture destination</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qcameracontrol.html">QCameraControl</a></p></td><td class="tblDescr"><p>Abstract base class for classes that control still cameras or video cameras</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qcameraexposurecontrol.html">QCameraExposureControl</a></p></td><td class="tblDescr"><p>Allows controlling camera exposure parameters</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qcamerafeedbackcontrol.html">QCameraFeedbackControl</a></p></td><td class="tblDescr"><p>Allows controlling feedback (sounds etc) during camera operation</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qcameraflashcontrol.html">QCameraFlashControl</a></p></td><td class="tblDescr"><p>Allows controlling a camera's flash</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qcamerafocuscontrol.html">QCameraFocusControl</a></p></td><td class="tblDescr"><p>Supplies control for focusing related camera parameters</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qcameraimagecapturecontrol.html">QCameraImageCaptureControl</a></p></td><td class="tblDescr"><p>Control interface for image capture services</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qcameraimageprocessingcontrol.html">QCameraImageProcessingControl</a></p></td><td class="tblDescr"><p>Abstract class for controlling image processing parameters, like white balance, contrast, saturation, sharpening and denoising</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qcamerainfocontrol.html">QCameraInfoControl</a></p></td><td class="tblDescr"><p>Camera info media control</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qcameralockscontrol.html">QCameraLocksControl</a></p></td><td class="tblDescr"><p>Abstract base class for classes that control still cameras or video cameras</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qcameraviewfindersettingscontrol.html">QCameraViewfinderSettingsControl</a></p></td><td class="tblDescr"><p>Abstract class for controlling camera viewfinder parameters</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qcameraviewfindersettingscontrol2.html">QCameraViewfinderSettingsControl2</a></p></td><td class="tblDescr"><p>Access to the viewfinder settings of a camera media service</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qcamerazoomcontrol.html">QCameraZoomControl</a></p></td><td class="tblDescr"><p>Supplies control for optical and digital camera zoom</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qimageencodercontrol.html">QImageEncoderControl</a></p></td><td class="tblDescr"><p>Access to the settings of a media service that performs image encoding</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qmediaaudioprobecontrol.html">QMediaAudioProbeControl</a></p></td><td class="tblDescr"><p>Allows control over probing audio data in media objects</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qmediaavailabilitycontrol.html">QMediaAvailabilityControl</a></p></td><td class="tblDescr"><p>Supplies a control for reporting availability of a service</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qmediacontainercontrol.html">QMediaContainerControl</a></p></td><td class="tblDescr"><p>Access to the output container format of a QMediaService</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qmediagaplessplaybackcontrol.html">QMediaGaplessPlaybackControl</a></p></td><td class="tblDescr"><p>Access to the gapless playback related control of a QMediaService</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qmedianetworkaccesscontrol.html">QMediaNetworkAccessControl</a></p></td><td class="tblDescr"><p>Allows the setting of the Network Access Point for media related activities</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qmediaplayercontrol.html">QMediaPlayerControl</a></p></td><td class="tblDescr"><p>Access to the media playing functionality of a QMediaService</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qmediarecordercontrol.html">QMediaRecorderControl</a></p></td><td class="tblDescr"><p>Access to the recording functionality of a QMediaService</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qmediastreamscontrol.html">QMediaStreamsControl</a></p></td><td class="tblDescr"><p>Media stream selection control</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qmediavideoprobecontrol.html">QMediaVideoProbeControl</a></p></td><td class="tblDescr"><p>Allows control over probing video frames in media objects</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qmetadatareadercontrol.html">QMetaDataReaderControl</a></p></td><td class="tblDescr"><p>Read access to the meta-data of a QMediaService's media</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qmetadatawritercontrol.html">QMetaDataWriterControl</a></p></td><td class="tblDescr"><p>Write access to the meta-data of a QMediaService's media</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qradiodatacontrol.html">QRadioDataControl</a></p></td><td class="tblDescr"><p>Access to the RDS functionality of the radio in the QMediaService</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qradiotunercontrol.html">QRadioTunerControl</a></p></td><td class="tblDescr"><p>Access to the radio tuning functionality of a QMediaService</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qvideodeviceselectorcontrol.html">QVideoDeviceSelectorControl</a></p></td><td class="tblDescr"><p>Video device selector media control</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qvideoencodersettingscontrol.html">QVideoEncoderSettingsControl</a></p></td><td class="tblDescr"><p>Access to the settings of a media service that performs video encoding</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qvideorenderercontrol.html">QVideoRendererControl</a></p></td><td class="tblDescr"><p>Media control for rendering video to a QAbstractVideoSurface</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qvideowindowcontrol.html">QVideoWindowControl</a></p></td><td class="tblDescr"><p>Media control for rendering video to a window</p></td></tr> <tr class="even topAlign"><td class="tblName"><p><a href="qmediacontrol.html">QMediaControl</a></p></td><td class="tblDescr"><p>Base interface for media service controls</p></td></tr> <tr class="odd topAlign"><td class="tblName"><p><a href="qmediaservice.html">QMediaService</a></p></td><td class="tblDescr"><p>Common base class for media service implementations</p></td></tr> </table></div> </div> <!-- @@@multimediabackend.html --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</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>