Media Player

Playing audio and video using Qt Quick.

This example demonstrates a simple multimedia player that can play audio and video files using various codecs.

Running the Example

To run the example from Qt Creator, open the Welcome mode and select the example from Examples. For more information, see Qt Creator: Tutorial: Build and run.

Project structure

This applications architecture is comprised of three custom QML modules:

MediaControl
MediaPlayer
Config

This is also reflected in the top-level CMakeLists.txt file:

add_subdirectory(MediaPlayer)
add_subdirectory(MediaControls)
add_subdirectory(Config)

target_link_libraries(MediaPlayerApp PRIVATE
    Qt6::Core
    Qt6::Svg
    Qt6::Quick
    Qt6::Multimedia
    MediaControlsplugin
    MediaPlayerplugin
    Configplugin

Each QML module is created using the qt_add_qml_module macro, for example see how the Config module is created.

qt_add_library(Config STATIC)

set_source_files_properties(Config.qml
    PROPERTIES
        QT_QML_SINGLETON_TYPE true
)

qt_add_qml_module(Config
    URI "Config"
    OUTPUT_DIRECTORY Config
    QML_FILES
        "Config.qml"
)

Qt Quick application

At its core this is a QML application, see Getting Started Programming with Qt Quick for information specific to that. This documentation is focused on how this example utilizes the Qt Multimedia QML Types.

The custom Config QML module

This type controls themes and layouts for an application, depending on the target operating system.

First we declare it a singleton, as we only need it to be instantiated once and creating copies would be a waste of resources.

To do that we add the following at the top of Config.qml

pragma Singleton

We then create a qmldir file in the Config directory named qmldir that contains the following:

module Config
singleton Config 1.0 Config.qml

Now to use it in our application, see how it is referenced in MediaPlayer's Main.qml file:

    color: Config.mainColor

The custom MediaControls QML module

This module holds all the types used to define the application's controls including:

AudioControl.qml
ControlImages.qml
CustomButton.qml
CustomRadioButton.qml
CustomSlider.qml
PlaybackControl.qml
PlaybackRateControl.qml
PlaybackSeekControl.qml

See each specific type's definition file for detail on how these controls are implemented. They are an evolution of the controls in the QML Media Player Example.

The custom `MediaPlayer` QML module

This module has the Main.qml file which declares where most of the top level types for the application are used, and crucially where the Qt Multimedia MediaPlayer and VideoOutput QML types are declared.

    MediaPlayer {
        id: mediaPlayer

        playbackRate: playbackControl.playbackRate
        videoOutput: videoOutput
        audioOutput: AudioOutput {
            id: audio
            volume: playbackControl.volume
        }
        source: new URL("https://download.qt.io/learning/videos/media-player-example/Qt_LogoMergeEffect.mp4")

        function updateMetadata() {
            root.metadataInfo.clear()
            root.metadataInfo.read(mediaPlayer.metaData)
        }

        onMetaDataChanged: updateMetadata()
        onActiveTracksChanged: updateMetadata()
        onErrorOccurred: {
            errorPopup.errorMsg = mediaPlayer.errorString
            errorPopup.open()
        }
        onTracksChanged: {
            settingsInfo.tracksInfo.selectedAudioTrack = mediaPlayer.activeAudioTrack
            settingsInfo.tracksInfo.selectedVideoTrack = mediaPlayer.activeVideoTrack
            settingsInfo.tracksInfo.selectedSubtitleTrack = mediaPlayer.activeSubtitleTrack
            updateMetadata()
        }

        onMediaStatusChanged: {
            if ((MediaPlayer.EndOfMedia === mediaStatus && mediaPlayer.loops !== MediaPlayer.Infinite) &&
                    ((root.currentFile < playlistInfo.mediaCount - 1) || playlistInfo.isShuffled)) {
                if (!playlistInfo.isShuffled) {
                    ++root.currentFile
                }
                root.playMedia()
            } else if (MediaPlayer.EndOfMedia === mediaStatus && root.playlistLooped && playlistInfo.mediaCount) {
                root.currentFile = 0
                root.playMedia()
            }
        }
    }

    VideoOutput {
        id: videoOutput

        anchors.top: fullScreen || Config.isMobileTarget ? parent.top : menuBar.bottom
        anchors.bottom: fullScreen ? parent.bottom : playbackControl.top
        anchors.left: parent.left
        anchors.right: parent.right
        anchors.leftMargin: fullScreen ? 0 : 20
        anchors.rightMargin: fullScreen ? 0 : 20
        visible: mediaPlayer.hasVideo

        property bool fullScreen: false

        TapHandler {
            onDoubleTapped: {
                if (parent.fullScreen) {
                    root.showNormal()
                } else {
                    root.showFullScreen()
                }
                parent.fullScreen = !parent.fullScreen
            }
            onTapped: {
                root.closeOverlays()
            }
        }
    }

The module contains the other customs types used for retrieving and displaying file information, as well as calling the file picker.

ErrorPopup.qml
Images.qml
MetadataInfo.qml
PlayerMenuBar.qml
PlaylistInfo.qml
SettingsInfo.qml
ThemeInfo.qml
TouchMenu.qml
TracksInfo.qml
TracksOptions.qml
UrlPopup.qml

See each specific type's definition file for detail on how types are implemented. Some are an evolution of those found in QML Media Player Example.

New functionality

This example application has some new functionality implemented by types, such as PlaylistInfo and ThemeInfo. See the respective .qml files for detail on how these are implemented.

Example project @ code.qt.io

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