Question

当音频会话以NAudio开始和结束时，我想收到回调。以下代码正在运行：

    private void SetupMediaSessionCallbacks()
    {
        // Foreach output endpoint
        foreach (var md in new MMDeviceEnumerator().EnumerateAudioEndPoints(DataFlow.Render, DeviceState.Active))
        {
            md.AudioSessionManager.OnSessionCreated += OnSessionCreated;
        }
    }

此代码在创建新音频会话时触发。我是NAudio的新手，所以我不明白如何设置RegisterEventClient来接收状态变化事件：

    private void OnSessionCreated(object sender, IAudioSessionControl newSession)
    {
        // Not working, need help here!
        AudioSessionControl audioSession = new AudioSessionControl(newSession);
        IAudioSessionEventsHandler handler = null;
        AudioSessionEventsCallback notifications = new AudioSessionEventsCallback(test);
        handler.OnStateChanged += new EventHandler<AudioSessionState>(notifications_StateChanged);
        audioSession.RegisterEventClient(handler);
    }

这是回调，我认为这是正确的：

    void notifications_StateChanged(object sender, AudioSessionState newState)
    {
        if (newState == AudioSessionState.AudioSessionStateActive)
        {
            Console.WriteLine("StateChanged");
        }
    }

非常感谢任何帮助。为此，我搜索了高低文档。

Answer 1

想出来。我需要创建自己的继承自IAudioSessionEventsHandler的类。这是OnSessionCreated的代码：

private void OnSessionCreated(object sender, IAudioSessionControl newSession)
{
    AudioSessionControl audioSession = new AudioSessionControl(newSession);
    NAudioEventCallbacks callbacks = new NAudioEventCallbacks();
    AudioSessionEventsCallback notifications = new AudioSessionEventsCallback(callbacks);
    audioSession.RegisterEventClient(callbacks);

}

public class NAudioEventCallbacks : IAudioSessionEventsHandler
{
    public void OnChannelVolumeChanged(uint channelCount, IntPtr newVolumes, uint channelIndex) { }

    public void OnDisplayNameChanged(string displayName) { }

    public void OnGroupingParamChanged(ref Guid groupingId) { }

    public void OnIconPathChanged(string iconPath) { }

    public void OnSessionDisconnected(AudioSessionDisconnectReason disconnectReason) { }

    public void OnStateChanged(AudioSessionState state) { }

    public void OnVolumeChanged(float volume, bool isMuted) { }
}

我现在可以在NAudioEventCallbacks中设置符合预期的断点。

使用NAudio接收状态更改的音频会话回调

1 个答案: