使用BackgroundCapableMedia在后台播放音频 [英] Play audio in background by use BackgroundCapableMedia

问题描述

在Windows8开发人员预览版中，我们可以使用以下代码在后台播放音频:

In the windows8 Developer preview we can use this code to play audio in background:

mediaElement.AudioCategory = AudioCategory.Media;

在Windows8客户视野中，似乎我们应该使用AudioCategory.BackgroundCapableMedia而不是AudioCategory.Media

In the windows8 Customer perview, It seems that we should use AudioCategory.BackgroundCapableMedia instead of AudioCategory.Media

mediaElement.AudioCategory=AudioCategory.BackgroundCapableMedia;

我还声明了appxmanifest中的后台任务

and I also Declare a background task in appxmanifest

<Extension Category="windows.backgroundTasks" EntryPoint="TestApp.App">
      <BackgroundTasks>
            <Task Type="audio" />
      </BackgroundTasks>
</Extension>

但是它对我不起作用，MediaElement将在MediaFailed EventHandler中引发"MF_MEDIA_ENGINE_ERR_SRC_NOT_SUPPORTED"异常 我该怎么办?

but it didn't work for me and the MediaElement will throw an "MF_MEDIA_ENGINE_ERR_SRC_NOT_SUPPORTED" exception in MediaFailed EventHandler How should I do?

推荐答案

您还需要设置以下事件处理程序:

You also need to set up these event handlers:

using Windows.Media;

MediaControl.PlayPressed += MediaControl_PlayPressed;
MediaControl.PausePressed += MediaControl_PausePressed;
MediaControl.PlayPauseTogglePressed += MediaControl_PlayPauseTogglePressed;
MediaControl.StopPressed += MediaControl_StopPressed;

-

void MediaControl_StopPressed(object sender, object e)
{
    myMediaPlayer.Stop();
}

void MediaControl_PlayPauseTogglePressed(object sender, object e)
{
}

void MediaControl_PausePressed(object sender, object e)
{
    myMediaPlayer.Pause();
}

void MediaControl_PlayPressed(object sender, object e)
{
    myMediaPlayer.Play();
}

我认为应该起作用.

这篇关于使用BackgroundCapableMedia在后台播放音频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！