Qt for HarmonyOS/qtohosextras doc/Audio Stream Usage Hint Example

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Audio Stream Usage Hint Example

Demonstrates tagging Qt sound playback with an OHOS audio stream usage hint.

A combo box lists all QtOhosExtras::Multimedia::AudioStreamUsageHint values. Two buttons play a bundled sound either through QSoundEffect or through QSound; before playback the selected hint is applied with Multimedia::setAudioStreamUsageHintProperty(). The hint influences how the system routes the audio and which volume policy applies.

For QSoundEffect the hint is set before the source is assigned and playback starts:

     auto *soundEffect = new QSoundEffect(this);
     QtOhosExtras::Multimedia::setAudioStreamUsageHintProperty(soundEffect, selectedAudioRole());
     soundEffect->setSource(QUrl(QString::fromLatin1("qrc:/test.wav")));
     soundEffect->setLoopCount(1);

The same function works for QSound:

     auto *sound = new QSound(QString::fromLatin1(":/test.wav"), this);
     QtOhosExtras::Multimedia::setAudioStreamUsageHintProperty(sound, selectedAudioRole());

Note: The target object must be a QSoundEffect or QSound instance; other object types are rejected with an error log. The example sets the hint before starting playback.

Files:

• multimedia/audiostreamusagehint/audiostreamusagehint.pro
• multimedia/audiostreamusagehint/main.cpp
• multimedia/audiostreamusagehint/resources.qrc