private static Interfaces.IAudioEndpointVolume GetMasterVolumeObject()
{
Interfaces.IMMDeviceEnumerator deviceEnumerator = null;
Interfaces.IMMDevice speakers = null;
try
{
deviceEnumerator = (Interfaces.IMMDeviceEnumerator)(new Interfaces.MMDeviceEnumerator());
deviceEnumerator.GetDefaultAudioEndpoint(Interfaces.EDataFlow.eRender, Interfaces.ERole.eMultimedia, out speakers);
Guid IID_IAudioEndpointVolume = typeof(Interfaces.IAudioEndpointVolume).GUID;
object o;
speakers.Activate(IID_IAudioEndpointVolume, 0, IntPtr.Zero, out o);
Interfaces.IAudioEndpointVolume masterVol = (Interfaces.IAudioEndpointVolume)o;
return(masterVol);
}
finally
{
if (speakers != null)
{
Marshal.ReleaseComObject(speakers);
}
if (deviceEnumerator != null)
{
Marshal.ReleaseComObject(deviceEnumerator);
}
}
}
/// <summary>
/// Switches between the master volume mute states depending on the current state
/// </summary>
/// <returns>the current mute state, true if the volume was muted, false if unmuted</returns>
public static bool ToggleMasterVolumeMute()
{
Interfaces.IAudioEndpointVolume masterVol = null;
try
{
masterVol = GetMasterVolumeObject();
if (masterVol == null)
{
return(false);
}
bool isMuted;
masterVol.GetMute(out isMuted);
masterVol.SetMute(!isMuted, Guid.Empty);
return(!isMuted);
}
finally
{
if (masterVol != null)
{
Marshal.ReleaseComObject(masterVol);
}
}
}
/// <summary>
/// Increments or decrements the current volume level by the <see cref="stepAmount"/>.
/// </summary>
/// <param name="stepAmount">Value between -100 and 100 indicating the desired step amount. Use negative numbers to decrease
/// the volume and positive numbers to increase it.</param>
/// <returns>the new volume level assigned</returns>
public static float StepMasterVolume(float stepAmount)
{
Interfaces.IAudioEndpointVolume masterVol = null;
try
{
masterVol = GetMasterVolumeObject();
if (masterVol == null)
{
return(-1);
}
float stepAmountScaled = stepAmount / 100;
// Get the level
float volumeLevel;
masterVol.GetMasterVolumeLevelScalar(out volumeLevel);
// Calculate the new level
float newLevel = volumeLevel + stepAmountScaled;
newLevel = Math.Min(1, newLevel);
newLevel = Math.Max(0, newLevel);
masterVol.SetMasterVolumeLevelScalar(newLevel, Guid.Empty);
// Return the new volume level that was set
return(newLevel * 100);
}
finally
{
if (masterVol != null)
{
Marshal.ReleaseComObject(masterVol);
}
}
}
/// <summary>
/// Sets the master volume to a specific level
/// </summary>
/// <param name="newLevel">Value between 0 and 100 indicating the desired scalar value of the volume</param>
public static void SetMasterVolume(float newLevel)
{
Interfaces.IAudioEndpointVolume masterVol = null;
try
{
masterVol = GetMasterVolumeObject();
if (masterVol == null)
{
return;
}
masterVol.SetMasterVolumeLevelScalar(newLevel / 100, Guid.Empty);
}
finally
{
if (masterVol != null)
{
Marshal.ReleaseComObject(masterVol);
}
}
}
/// <summary>
/// Mute or unmute the master volume
/// </summary>
/// <param name="isMuted">true to mute the master volume, false to unmute</param>
public static void SetMasterVolumeMute(bool isMuted)
{
Interfaces.IAudioEndpointVolume masterVol = null;
try
{
masterVol = GetMasterVolumeObject();
if (masterVol == null)
{
return;
}
masterVol.SetMute(isMuted, Guid.Empty);
}
finally
{
if (masterVol != null)
{
Marshal.ReleaseComObject(masterVol);
}
}
}
/// <summary>
/// Gets the current master volume in scalar values (percentage)
/// </summary>
/// <returns>-1 in case of an error, if successful the value will be between 0 and 100</returns>
public static float GetMasterVolume()
{
Interfaces.IAudioEndpointVolume masterVol = null;
try
{
masterVol = GetMasterVolumeObject();
if (masterVol == null)
{
return(-1);
}
float volumeLevel;
masterVol.GetMasterVolumeLevelScalar(out volumeLevel);
return(volumeLevel * 100);
}
finally
{
if (masterVol != null)
{
Marshal.ReleaseComObject(masterVol);
}
}
}
