/// <summary>
/// Marshals a native AUDIO_VOLUME_NOTIFICATION_DATA structure to a <see cref="AudioVolumeNotificationData"/> object.
/// </summary>
/// <param name="ptr">A pointer to an AUDIO_VOLUME_NOTIFICATION_DATA structure.</param>
/// <returns>The marshaled <see cref="AudioVolumeNotificationData"/> object.</returns>
internal static AudioVolumeNotificationData MarshalFromPtr(IntPtr ptr)
{
AudioVolumeNotificationDataStruct data = (AudioVolumeNotificationDataStruct)Marshal.PtrToStructure(ptr, typeof(AudioVolumeNotificationDataStruct));
IntPtr channelVolumesPtr = new IntPtr(ptr.ToInt64() + Marshal.OffsetOf <AudioVolumeNotificationDataStruct>("ChannelVolume0").ToInt64());
// Read dynamic channel volumes array
float[] channelVolume = new float[data.Channels];
Marshal.Copy(channelVolumesPtr, channelVolume, 0, data.Channels);
// Construct the complete AudioVolumeNotificationData object
AudioVolumeNotificationData notificationData = new AudioVolumeNotificationData()
{
EventContext = data.EventContext,
Muted = data.Muted,
MasterVolume = data.MasterVolume,
Channels = data.Channels,
ChannelVolume = channelVolume,
};
return(notificationData);
}
/// <summary>
/// Callback method for endpoint-volume-change notifications.
/// </summary>
/// <param name="pNotify">Pointer to the notification data.</param>
public void OnNotify(IntPtr pNotify)
{
this.callback?.Invoke(AudioVolumeNotificationData.MarshalFromPtr(pNotify));
}