/// <summary>
/// Set the value of one member of the IAMStreamConfig format block.
/// Helper function for several properties that expose
/// video/audio settings from IAMStreamConfig.GetFormat().
/// IAMStreamConfig.GetFormat() returns a AMMediaType struct.
/// AMMediaType.formatPtr points to a format block structure.
/// This format block structure may be one of several
/// types, the type being determined by AMMediaType.formatType.
/// </summary>
protected object setStreamConfigSetting( IAMStreamConfig streamConfig, string fieldName, object newValue)
{
//if ( streamConfig == null )
// throw new NotSupportedException();
assertStopped();
derenderGraph();
object returnValue = null;
IntPtr pmt = IntPtr.Zero;
AMMediaType mediaType = new AMMediaType();
try
{
// Get the current format info
int hr = streamConfig.GetFormat( out pmt );
//if ( hr != 0 )
// Marshal.ThrowExceptionForHR( hr );
Marshal.PtrToStructure( pmt, mediaType );
// The formatPtr member points to different structures
// dependingon the formatType
object formatStruct;
if ( mediaType.formatType == FormatType.WaveEx )
formatStruct = new WaveFormatEx();
else if ( mediaType.formatType == FormatType.VideoInfo )
formatStruct = new VideoInfoHeader();
else if ( mediaType.formatType == FormatType.VideoInfo2 )
formatStruct = new VideoInfoHeader2();
else
throw new NotSupportedException( "This device does not support a recognized format block." );
// Retrieve the nested structure
Marshal.PtrToStructure( mediaType.formatPtr, formatStruct );
// Find the required field
Type structType = formatStruct.GetType();
FieldInfo fieldInfo = structType.GetField( fieldName );
if ( fieldInfo == null )
throw new NotSupportedException( "Unable to find the member '" + fieldName + "' in the format block." );
// Update the value of the field
fieldInfo.SetValue( formatStruct, newValue );
// PtrToStructure copies the data so we need to copy it back
Marshal.StructureToPtr( formatStruct, mediaType.formatPtr, false );
// Save the changes
hr = streamConfig.SetFormat( mediaType );
//if ( hr != 0 )
// Marshal.ThrowExceptionForHR( hr );
}
finally
{
DsUtils.FreeAMMediaType( mediaType );
Marshal.FreeCoTaskMem( pmt );
}
renderStream = false;
renderGraph();
startPreviewIfNeeded();
return( returnValue );
}
protected object setStreamConfigSetting(IAMStreamConfig streamConfig, string fieldName, object newValue)
{
if (streamConfig == null)
{
throw new NotSupportedException();
}
this.assertStopped();
this.derenderGraph();
IntPtr zero = IntPtr.Zero;
AMMediaType structure = new AMMediaType();
try
{
object obj3;
int format = streamConfig.GetFormat(out zero);
if (format != 0)
{
Marshal.ThrowExceptionForHR(format);
}
Marshal.PtrToStructure(zero, structure);
if (structure.formatType == FormatType.WaveEx)
{
obj3 = new WaveFormatEx();
}
else if (structure.formatType == FormatType.VideoInfo)
{
obj3 = new VideoInfoHeader();
}
else
{
if (structure.formatType != FormatType.VideoInfo2)
{
throw new NotSupportedException("This device does not support a recognized format block.");
}
obj3 = new VideoInfoHeader2();
}
Marshal.PtrToStructure(structure.formatPtr, obj3);
FieldInfo field = obj3.GetType().GetField(fieldName);
if (field == null)
{
throw new NotSupportedException("Unable to find the member '" + fieldName + "' in the format block.");
}
field.SetValue(obj3, newValue);
Marshal.StructureToPtr(obj3, structure.formatPtr, false);
format = streamConfig.SetFormat(structure);
if (format != 0)
{
Marshal.ThrowExceptionForHR(format);
}
}
finally
{
DsUtils.FreeAMMediaType(structure);
Marshal.FreeCoTaskMem(zero);
}
this.renderGraph();
this.startPreviewIfNeeded();
return null;
}
protected object setStreamConfigSetting(DShowNET.IAMStreamConfig streamConfig, string fieldName, object newValue)
{
if (streamConfig == null)
{
throw new NotSupportedException();
}
object returnValue = null;
IntPtr pmt = IntPtr.Zero;
DShowNET.AMMediaType mediaType = new DShowNET.AMMediaType();
try
{
// Get the current format info
int hr = streamConfig.GetFormat(out pmt);
if (hr != 0)
{
Marshal.ThrowExceptionForHR(hr);
}
Marshal.PtrToStructure(pmt, mediaType);
// The formatPtr member points to different structures
// dependingon the formatType
object formatStruct;
if (mediaType.formatType == DShowNET.FormatType.WaveEx)
{
formatStruct = new DShowNET.WaveFormatEx();
}
else if (mediaType.formatType == DShowNET.FormatType.VideoInfo)
{
formatStruct = new VideoInfoHeader();
}
else if (mediaType.formatType == DShowNET.FormatType.VideoInfo2)
{
formatStruct = new DShowNET.VideoInfoHeader2();
}
else
{
throw new NotSupportedException("This device does not support a recognized format block.");
}
// Retrieve the nested structure
Marshal.PtrToStructure(mediaType.formatPtr, formatStruct);
// Find the required field
Type structType = formatStruct.GetType();
FieldInfo fieldInfo = structType.GetField(fieldName);
if (fieldInfo == null)
{
throw new NotSupportedException("Unable to find the member '" + fieldName + "' in the format block.");
}
// Update the value of the field
fieldInfo.SetValue(formatStruct, newValue);
// PtrToStructure copies the data so we need to copy it back
Marshal.StructureToPtr(formatStruct, mediaType.formatPtr, false);
// Save the changes
hr = streamConfig.SetFormat(mediaType);
if (hr != 0)
{
Marshal.ThrowExceptionForHR(hr);
}
}
finally
{
//DShowNET.DsUtils.FreeAMMediaType(mediaType);
Marshal.FreeCoTaskMem(pmt);
}
return(returnValue);
}