Qt Documentation

Contents

SoundInstance QML Type

Play 3d audio content. More...

Import Statement: import QtAudioEngine 1.1
Since: Qt 5.0
Inherits:

Item

Properties

Signals

Methods

Detailed Description

There are two ways to create SoundInstance objects. You can obtain it by calling newInstance method of a Sound:

Rectangle {
    id:root
    color:"white"
    width: 300
    height: 500

    AudioEngine {
        id:audioengine

        AudioSample {
            name:"explosion01"
            source: "explosion-01.wav"
        }

        Sound {
            name:"explosion"
            PlayVariation {
                sample:"explosion01"
            }
        }
    }

    property variant soundEffect: audioengine.sounds["explosion"].newInstance();

    MouseArea {
        anchors.fill: parent
        onPressed: {
            root.soundEffect.play();
        }
    }
}

Or alternatively, you can explicitly define SoundInstance outside of AudioEngine for easier qml bindings:

Rectangle {
    id:root
    color:"white"
    width: 300
    height: 500

    AudioEngine {
        id:audioengine

        AudioSample {
            name:"explosion01"
            source: "explosion-01.wav"
        }

        Sound {
            name:"explosion"
            PlayVariation {
                sample:"explosion01"
            }
        }
    }

    Item {
        id: animator
        x: 10 + observer.percent * 100
        y: 20 + observer.percent * 80
        property real percent: 0
        SequentialAnimation on percent {
            loops: Animation.Infinite
            running: true
            NumberAnimation {
            duration: 8000
            from: 0
            to: 1
            }

        }
    }

    SoundInstance {
        id:soundEffect
        engine:audioengine
        sound:"explosion"
        position:Qt.vector3d(animator.x, animator.y, 0);
    }

    MouseArea {
        anchors.fill: parent
        onPressed: {
            soundEffect.play();
        }
    }
}

Property Documentation

direction : vector3d

This property holds the current 3d direction.


engine : QtAudioEngine::AudioEngine

This property holds the reference to AudioEngine, must be set only once.


gain : vector3d

This property holds the gain adjustment which will be used to modulate the audio output level from this SoundInstance.


pitch : vector3d

This property holds the pitch adjustment which will be used to modulate the audio pitch from this SoundInstance.


position : vector3d

This property holds the current 3d position.


sound : string

This property specifies which Sound this SoundInstance will use. Unlike some properties in other types, this property can be changed dynamically.


state : enumeration

This property holds the current playback state. It can be one of:

ValueDescription
StopppedStateThe SoundInstance is not playing, and when playback begins next it will play from position zero.
PlayingStateThe SoundInstance is playing the media.
PausedStateThe SoundInstance is not playing, and when playback begins next it will play from the position that it was paused at.

velocity : vector3d

This property holds the current 3d velocity.


Signal Documentation

directionChanged()

This signal is emitted when direction is changed

The corresponding handler is onDirectionChanged.


gainChanged()

This signal is emitted when gain is changed

The corresponding handler is onGainChanged.


pitchChanged()

This signal is emitted when pitch is changed

The corresponding handler is onPitchChanged.


positionChanged()

This signal is emitted when position is changed

The corresponding handler is onPositionChanged.


soundChanged()

This signal is emitted when sound is changed

The corresponding handler is onSoundChanged.


stateChanged(state)

This signal is emitted when state is changed

The corresponding handler is onStateChanged.


velocityChanged()

This signal is emitted when velocity is changed

The corresponding handler is onVelocityChanged.


Method Documentation

pause()

Pauses current playback.


play()

Starts playback.


stop()

Stops current playback.


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