/// <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)
{
int hresult = audioClientInterface.IsFormatSupported(shareMode, desiredFormat, out closestMatchFormat);
// S_OK is 0, S_FALSE = 1
if (hresult == 0)
{
// directly supported
return true;
}
if (hresult == 1)
{
return false;
}
if (hresult == (int)AudioClientErrors.UnsupportedFormat)
{
return false;
}
Marshal.ThrowExceptionForHR(hresult);
// shouldn't get here
throw new NotSupportedException("Unknown hresult " + hresult);
}
/// <summary>
/// Determines whether if the specified output format is supported
/// </summary>
/// <param name="shareMode">The share mode.</param>
/// <param name="desiredFormat">The desired format.</param>
/// <returns>True if the format is supported</returns>
public bool IsFormatSupported(AudioClientShareMode shareMode,
WaveFormat desiredFormat)
{
WaveFormatExtensible closestMatchFormat;
return IsFormatSupported(shareMode, desiredFormat, out closestMatchFormat);
}
/// <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;
int hresult = audioClientInterface.Initialize(shareMode, streamFlags, bufferDuration, periodicity, waveFormat, ref audioSessionGuid);
Marshal.ThrowExceptionForHR(hresult);
// may have changed the mix format so reset it
mixFormat = null;
}
/// <summary>
/// Helper function to marshal WaveFormat to an IntPtr
/// </summary>
/// <param name="format">WaveFormat</param>
/// <returns>IntPtr to WaveFormat structure (needs to be freed by callee)</returns>
public static IntPtr MarshalToPtr(WaveFormat format)
{
int formatSize = Marshal.SizeOf(format);
IntPtr formatPointer = Marshal.AllocHGlobal(formatSize);
Marshal.StructureToPtr(format, formatPointer, false);
return formatPointer;
}
/// <summary>
/// Creates a new 32 bit IEEE floating point wave format
/// </summary>
/// <param name="sampleRate">sample rate</param>
/// <param name="channels">number of channels</param>
public static WaveFormat CreateIeeeFloatWaveFormat(int sampleRate, int channels)
{
WaveFormat wf = new WaveFormat();
wf.waveFormatTag = WaveFormatEncoding.IeeeFloat;
wf.channels = (short)channels;
wf.bitsPerSample = 32;
wf.sampleRate = sampleRate;
wf.blockAlign = (short) (4*channels);
wf.averageBytesPerSecond = sampleRate * wf.blockAlign;
wf.extraSize = 0;
return wf;
}
/// <summary>
/// Creates a WaveFormat with custom members
/// </summary>
/// <param name="tag">The encoding</param>
/// <param name="sampleRate">Sample Rate</param>
/// <param name="channels">Number of channels</param>
/// <param name="averageBytesPerSecond">Average Bytes Per Second</param>
/// <param name="blockAlign">Block Align</param>
/// <param name="bitsPerSample">Bits Per Sample</param>
/// <returns></returns>
public static WaveFormat CreateCustomFormat(WaveFormatEncoding tag, int sampleRate, int channels, int averageBytesPerSecond, int blockAlign, int bitsPerSample)
{
WaveFormat waveFormat = new WaveFormat();
waveFormat.waveFormatTag = tag;
waveFormat.channels = (short)channels;
waveFormat.sampleRate = sampleRate;
waveFormat.averageBytesPerSecond = averageBytesPerSecond;
waveFormat.blockAlign = (short)blockAlign;
waveFormat.bitsPerSample = (short)bitsPerSample;
waveFormat.extraSize = 0;
return waveFormat;
}
