/// <summary>
/// Initialize for playing the specified wave stream
/// </summary>
/// <param name="waveProvider">IWaveProvider to play</param>
public void Init(IWaveProvider waveProvider)
{
long latencyRefTimes = latencyMilliseconds * 10000;
outputFormat = waveProvider.WaveFormat;
// first attempt uses the WaveFormat from the WaveStream
WaveFormatExtensible closestSampleRateFormat;
if (!audioClient.IsFormatSupported(shareMode, outputFormat, out closestSampleRateFormat))
{
// Use closesSampleRateFormat (in sharedMode, it equals usualy to the audioClient.MixFormat)
// See documentation : http://msdn.microsoft.com/en-us/library/ms678737(VS.85).aspx
// They say : "In shared mode, the audio engine always supports the mix format"
// The MixFormat is more likely to be a WaveFormatExtensible.
if (closestSampleRateFormat == null)
{
WaveFormat correctSampleRateFormat = audioClient.MixFormat;
/*WaveFormat.CreateIeeeFloatWaveFormat(
audioClient.MixFormat.SampleRate,
audioClient.MixFormat.Channels);*/
if (!audioClient.IsFormatSupported(shareMode, correctSampleRateFormat))
{
// Iterate from Worst to Best Format
WaveFormatExtensible[] bestToWorstFormats = {
new WaveFormatExtensible(
outputFormat.SampleRate, 32,
outputFormat.Channels),
new WaveFormatExtensible(
outputFormat.SampleRate, 24,
outputFormat.Channels),
new WaveFormatExtensible(
outputFormat.SampleRate, 16,
outputFormat.Channels),
};
// Check from best Format to worst format ( Float32, Int24, Int16 )
for (int i = 0; i < bestToWorstFormats.Length; i++ )
{
correctSampleRateFormat = bestToWorstFormats[i];
if ( audioClient.IsFormatSupported(shareMode, correctSampleRateFormat) )
{
break;
}
correctSampleRateFormat = null;
}
// If still null, then test on the PCM16, 2 channels
if (correctSampleRateFormat == null)
{
// Last Last Last Chance (Thanks WASAPI)
correctSampleRateFormat = new WaveFormatExtensible(outputFormat.SampleRate, 16, 2);
if (!audioClient.IsFormatSupported(shareMode, correctSampleRateFormat))
{
throw new NotSupportedException("Can't find a supported format to use");
}
}
}
outputFormat = correctSampleRateFormat;
}
else
{
outputFormat = closestSampleRateFormat;
}
// just check that we can make it.
using (new ResamplerDmoStream(waveProvider, outputFormat))
{
}
this.dmoResamplerNeeded = true;
}
else
{
dmoResamplerNeeded = false;
}
this.sourceProvider = waveProvider;
// If using EventSync, setup is specific with shareMode
if (isUsingEventSync)
{
// Init Shared or Exclusive
if (shareMode == AudioClientShareMode.Shared)
{
// With EventCallBack and Shared, both latencies must be set to 0
audioClient.Initialize(shareMode, AudioClientStreamFlags.EventCallback, 0, 0,
outputFormat, Guid.Empty);
// Get back the effective latency from AudioClient
latencyMilliseconds = (int)(audioClient.StreamLatency / 10000);
}
else
{
// With EventCallBack and Exclusive, both latencies must equals
audioClient.Initialize(shareMode, AudioClientStreamFlags.EventCallback, latencyRefTimes, latencyRefTimes,
outputFormat, Guid.Empty);
}
// Create the Wait Event Handle
frameEventWaitHandle = new EventWaitHandle(false, EventResetMode.AutoReset);
audioClient.SetEventHandle(frameEventWaitHandle.SafeWaitHandle.DangerousGetHandle());
}
else
{
// Normal setup for both sharedMode
audioClient.Initialize(shareMode, AudioClientStreamFlags.None, latencyRefTimes, 0,
outputFormat, Guid.Empty);
}
// Get the RenderClient
renderClient = audioClient.AudioRenderClient;
}
/// <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);
}