/// <summary>
/// Helper function to make a DMO Media Type to represent a particular WaveFormat
/// </summary>
private DmoMediaType CreateDmoMediaTypeForWaveFormat(WaveFormat waveFormat)
{
DmoMediaType mediaType = new DmoMediaType();
int waveFormatExSize = Marshal.SizeOf(waveFormat); // 18 + waveFormat.ExtraSize;
DmoInterop.MoInitMediaType(ref mediaType, waveFormatExSize);
mediaType.SetWaveFormat(waveFormat);
return(mediaType);
}
/// <summary>
/// Set output type to the specified wave format
/// n.b. may need to set input type first
/// </summary>
/// <param name="outputStreamIndex">Output stream index</param>
/// <param name="waveFormat">Wave format</param>
public void SetOutputWaveFormat(int outputStreamIndex, WaveFormat waveFormat)
{
DmoMediaType mediaType = CreateDmoMediaTypeForWaveFormat(waveFormat);
bool succeeded = SetOutputType(outputStreamIndex, mediaType, DmoSetTypeFlags.None);
DmoInterop.MoFreeMediaType(ref mediaType);
if (!succeeded)
{
throw new ArgumentException("Media Type not supported");
}
}
/// <summary>
/// Helper method to call SetOutputType
/// </summary>
private bool SetOutputType(int outputStreamIndex, DmoMediaType mediaType, DmoSetTypeFlags flags)
{
int hresult = mediaObject.SetOutputType(outputStreamIndex, ref mediaType, flags);
if (hresult == (int)DmoHResults.DMO_E_TYPE_NOT_ACCEPTED)
{
return(false);
}
else if (hresult == HResult.S_OK)
{
return(true);
}
else
{
throw Marshal.GetExceptionForHR(hresult);
}
}
/// <summary>
/// Sets the input type helper method
/// </summary>
/// <param name="inputStreamIndex">Input stream index</param>
/// <param name="mediaType">Media type</param>
/// <param name="flags">Flags (can be used to test rather than set)</param>
private bool SetInputType(int inputStreamIndex, DmoMediaType mediaType, DmoSetTypeFlags flags)
{
int hResult = mediaObject.SetInputType(inputStreamIndex, ref mediaType, flags);
if (hResult != HResult.S_OK)
{
if (hResult == (int)DmoHResults.DMO_E_INVALIDSTREAMINDEX)
{
throw new ArgumentException("Invalid stream index");
}
if (hResult == (int)DmoHResults.DMO_E_TYPE_NOT_ACCEPTED)
{
Debug.WriteLine("Media type was not accepted");
}
return(false);
}
return(true);
}
/// <summary>
/// Checks if a specified output type is supported
/// n.b. you may need to set the input type first
/// </summary>
/// <param name="outputStreamIndex">Output stream index</param>
/// <param name="mediaType">Media type</param>
/// <returns>True if supported</returns>
public bool SupportsOutputType(int outputStreamIndex, DmoMediaType mediaType)
{
return(SetOutputType(outputStreamIndex, mediaType, DmoSetTypeFlags.DMO_SET_TYPEF_TEST_ONLY));
}
/// <summary>
/// Helper method to call SetOutputType
/// </summary>
private bool SetOutputType(int outputStreamIndex, DmoMediaType mediaType, DmoSetTypeFlags flags)
{
int hresult = mediaObject.SetOutputType(outputStreamIndex, ref mediaType, flags);
if (hresult == (int)DmoHResults.DMO_E_TYPE_NOT_ACCEPTED)
{
return false;
}
else if (hresult == HResult.S_OK)
{
return true;
}
else
{
throw Marshal.GetExceptionForHR(hresult);
}
}
/// <summary>
/// Sets the output type
/// n.b. may need to set the input type first
/// </summary>
/// <param name="outputStreamIndex">Output stream index</param>
/// <param name="mediaType">Media type to set</param>
public void SetOutputType(int outputStreamIndex, DmoMediaType mediaType)
{
if (!SetOutputType(outputStreamIndex, mediaType, DmoSetTypeFlags.None))
{
throw new ArgumentException("Media Type not supported");
}
}
/// <summary>
/// Checks if a specified output type is supported
/// n.b. you may need to set the input type first
/// </summary>
/// <param name="outputStreamIndex">Output stream index</param>
/// <param name="mediaType">Media type</param>
/// <returns>True if supported</returns>
public bool SupportsOutputType(int outputStreamIndex, DmoMediaType mediaType)
{
return SetOutputType(outputStreamIndex, mediaType, DmoSetTypeFlags.DMO_SET_TYPEF_TEST_ONLY);
}
/// <summary>
/// Helper function to make a DMO Media Type to represent a particular WaveFormat
/// </summary>
private DmoMediaType CreateDmoMediaTypeForWaveFormat(WaveFormat waveFormat)
{
DmoMediaType mediaType = new DmoMediaType();
int waveFormatExSize = Marshal.SizeOf(waveFormat); // 18 + waveFormat.ExtraSize;
DmoInterop.MoInitMediaType(ref mediaType, waveFormatExSize);
mediaType.SetWaveFormat(waveFormat);
return mediaType;
}
/// <summary>
/// Sets the input type helper method
/// </summary>
/// <param name="inputStreamIndex">Input stream index</param>
/// <param name="mediaType">Media type</param>
/// <param name="flags">Flags (can be used to test rather than set)</param>
private bool SetInputType(int inputStreamIndex, DmoMediaType mediaType, DmoSetTypeFlags flags)
{
int hResult = mediaObject.SetInputType(inputStreamIndex, ref mediaType, flags);
if (hResult != HResult.S_OK)
{
if (hResult == (int)DmoHResults.DMO_E_INVALIDSTREAMINDEX)
{
throw new ArgumentException("Invalid stream index");
}
if (hResult == (int)DmoHResults.DMO_E_TYPE_NOT_ACCEPTED)
{
Debug.WriteLine("Media type was not accepted");
}
return false;
}
return true;
}
public static extern int MoInitMediaType(
[In, Out] ref DmoMediaType mediaType, int formatBlockBytes);
public static extern int MoFreeMediaType(
[In] ref DmoMediaType mediaType);