/// <summary>
/// Determines if the specified output format is supported in shared mode
/// </summary>
/// <param name="shareMode">Share Mode</param>
/// <param name="desiredFormat">Desired Format</param>
/// <param name="closestMatchFormat">Output The closest match format.</param>
/// <returns>True if the format is supported</returns>
public bool IsFormatSupported(AudioClientShareMode shareMode, WaveFormat desiredFormat, out WaveFormatExtensible closestMatchFormat)
{
IntPtr pointerToPtr = GetPointerToPointer(); // IntPtr.Zero; // Marshal.AllocHGlobal(Marshal.SizeOf<WaveFormatExtensible>());
closestMatchFormat = null;
var pDesiredFormat = desiredFormat.AsInterop();
int hresult = audioClientInterface.IsFormatSupported(shareMode, ref pDesiredFormat, pointerToPtr);
var closestMatchPtr = MarshalHelpers.PtrToStructure<IntPtr>(pointerToPtr);
if (closestMatchPtr != IntPtr.Zero)
{
closestMatchFormat = MarshalHelpers.PtrToStructure<WaveFormatExtensibleInterop>(closestMatchPtr);
Marshal.FreeCoTaskMem(closestMatchPtr);
}
Marshal.FreeHGlobal(pointerToPtr);
// S_OK is 0, S_FALSE = 1
if (hresult == 0)
{
// directly supported
return true;
}
if (hresult == 1)
{
return false;
}
if (hresult == (int)AudioClientErrors.UnsupportedFormat)
{
// Succeeded but the specified format is not supported in exclusive mode.
return shareMode != AudioClientShareMode.Exclusive;
}
Marshal.ThrowExceptionForHR(hresult);
// shouldn't get here
throw new NotSupportedException("Unknown hresult " + hresult);
}
/// <summary>
/// Initializes the Audio Client
/// </summary>
/// <param name="shareMode">Share Mode</param>
/// <param name="streamFlags">Stream Flags</param>
/// <param name="bufferDuration">Buffer Duration</param>
/// <param name="periodicity">Periodicity</param>
/// <param name="waveFormat">Wave Format</param>
/// <param name="audioSessionGuid">Audio Session GUID (can be null)</param>
public void Initialize(AudioClientShareMode shareMode,
AudioClientStreamFlags streamFlags,
long bufferDuration,
long periodicity,
WaveFormat waveFormat,
Guid audioSessionGuid)
{
this.shareMode = shareMode;
var pFormat = waveFormat.AsInterop();
int hresult = audioClientInterface.Initialize(shareMode, streamFlags, bufferDuration, periodicity, ref pFormat, ref audioSessionGuid);
Marshal.ThrowExceptionForHR(hresult);
// may have changed the mix format so reset it
mixFormat = null;
}