当切换到全息模式时，UWP背景音频不起作用 [英] UWP Background audio not working when switched to Holographic mode

问题描述

我对UWP很陌生.我正在测试器应用程序(2D)中设计的应用程序，该应用程序将启动全息应用程序(使用深层链接-LaunchUriAsync)，然后播放一些音频.音频回放机制是通过后台任务完成的.我遵循了Microsoft的基本文档，但是在全息视图中，音频似乎无法播放.如果将全息应用程序替换为另一个2D UWP应用程序，我可以听到音频.

I'm quite new to UWP. The app I'm designing in a tester app (2D) that launches a Holographic App (using deep link - LaunchUriAsync) followed by some audio playback. The audio playback mechanism is done through a background task. I have followed the essential documentation from microsoft but it appears the audio won't play when I am in holographic view. If the replace the holographic app with a another 2D UWP app, I can hear the audio.

后台任务的代码段.

protected async override void OnBackgroundActivated(BackgroundActivatedEventArgs args)
{

    base.OnBackgroundActivated(args);

    IBackgroundTaskInstance taskInstance = args.TaskInstance;

    System.Diagnostics.Debug.WriteLine("Background activated Requested...");

    await Task.Delay(10000);
    MediaPlayer player = new MediaPlayer();
    player.AutoPlay = true;
    SystemMediaTransportControls systemMediaTransportControls = player.SystemMediaTransportControls;
    systemMediaTransportControls.IsPlayEnabled = true;


    var synth = new Windows.Media.SpeechSynthesis.SpeechSynthesizer();
    Windows.Media.SpeechSynthesis.SpeechSynthesisStream stream = await synth.SynthesizeTextToStreamAsync("Play video");
    player.SetStreamSource(stream);
    player.Play(); // audio playback doesn't work in holographic mode

}

这是大多数代码.我也愿意分享整个项目.

Here is most of the code. I'm willing to share the whole project as well.

推荐答案

发现MediaPlayer.AudioCategory未设置为Media.这是限制音频以覆盖全息应用程序的游戏媒体流.

Found out the MediaPlayer.AudioCategory was not set to Media. This was restricting audio to override the gamemedia streams from the holographic app.

这解决了问题！

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