internal AudioDevice(IMFActivate dev)
{
Device = dev;
int cItems;
HResult hr = dev.GetCount(out cItems);
NativeHelpers.CheckHr(hr, "IMFActivate.GetCount");
for (int j = 0; j < cItems; j++)
{
Guid key;
using (PropVariant value = new PropVariant())
{
hr = dev.GetItemByIndex(j, out key, value);
Debug.WriteLine("{0}={1}", key.ToString(), value.ToString());
if (key == MFAttributesClsid.MF_DEVSOURCE_ATTRIBUTE_FRIENDLY_NAME)
{
Name = value.ToString();
}
else if (key == MFAttributesClsid.MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_AUDCAP_SYMBOLIC_LINK)
{
SymbolicLink = value.ToString();
}
else if (key == MFAttributesClsid.MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_AUDCAP_ENDPOINT_ID)
{
EndPointId = value.ToString();
}
}
}
}
private static void AddAttribute(IMFActivate mft, int index, StringBuilder sb)
{
var variantPtr = Marshal.AllocHGlobal(MarshalHelpers.SizeOf <PropVariant>());
try
{
Guid key;
mft.GetItemByIndex(index, out key, variantPtr);
var value = MarshalHelpers.PtrToStructure <PropVariant>(variantPtr);
string propertyName = FieldDescriptionHelper.Describe(typeof(MediaFoundationAttributes), key);
if (key == MediaFoundationAttributes.MFT_INPUT_TYPES_Attributes ||
key == MediaFoundationAttributes.MFT_OUTPUT_TYPES_Attributes)
{
var types = value.GetBlobAsArrayOf <MFT_REGISTER_TYPE_INFO>();
sb.AppendFormat("{0}: {1} items:", propertyName, types.Length);
sb.AppendLine();
foreach (var t in types)
{
sb.AppendFormat(" {0}-{1}",
FieldDescriptionHelper.Describe(typeof(MediaTypes), t.guidMajorType),
FieldDescriptionHelper.Describe(typeof(AudioSubtypes), t.guidSubtype));
sb.AppendLine();
}
}
else if (key == MediaFoundationAttributes.MF_TRANSFORM_CATEGORY_Attribute)
{
sb.AppendFormat("{0}: {1}", propertyName,
FieldDescriptionHelper.Describe(typeof(MediaFoundationTransformCategories), (Guid)value.Value));
sb.AppendLine();
}
else if (value.DataType == (VarEnum.VT_VECTOR | VarEnum.VT_UI1))
{
var b = (byte[])value.Value;
sb.AppendFormat("{0}: Blob of {1} bytes", propertyName, b.Length);
sb.AppendLine();
}
else
{
sb.AppendFormat("{0}: {1}", propertyName, value.Value);
sb.AppendLine();
}
}
finally
{
PropVariant.Clear(variantPtr);
Marshal.FreeHGlobal(variantPtr);
}
}
private static void AddAttribute(IMFActivate mft, int index, StringBuilder sb)
{
var variantPtr = Marshal.AllocHGlobal(MarshalHelpers.SizeOf<PropVariant>());
try
{
Guid key;
mft.GetItemByIndex(index, out key, variantPtr);
var value = MarshalHelpers.PtrToStructure<PropVariant>(variantPtr);
string propertyName = FieldDescriptionHelper.Describe(typeof (MediaFoundationAttributes), key);
if (key == MediaFoundationAttributes.MFT_INPUT_TYPES_Attributes ||
key == MediaFoundationAttributes.MFT_OUTPUT_TYPES_Attributes)
{
var types = value.GetBlobAsArrayOf<MFT_REGISTER_TYPE_INFO>();
sb.AppendFormat("{0}: {1} items:", propertyName, types.Length);
sb.AppendLine();
foreach (var t in types)
{
sb.AppendFormat(" {0}-{1}",
FieldDescriptionHelper.Describe(typeof (MediaTypes), t.guidMajorType),
FieldDescriptionHelper.Describe(typeof (AudioSubtypes), t.guidSubtype));
sb.AppendLine();
}
}
else if (key == MediaFoundationAttributes.MF_TRANSFORM_CATEGORY_Attribute)
{
sb.AppendFormat("{0}: {1}", propertyName,
FieldDescriptionHelper.Describe(typeof (MediaFoundationTransformCategories), (Guid) value.Value));
sb.AppendLine();
}
else if (value.DataType == (VarEnum.VT_VECTOR | VarEnum.VT_UI1))
{
var b = (byte[]) value.Value;
sb.AppendFormat("{0}: Blob of {1} bytes", propertyName, b.Length);
sb.AppendLine();
}
else
{
sb.AppendFormat("{0}: {1}", propertyName, value.Value);
sb.AppendLine();
}
}
finally
{
PropVariant.Clear(variantPtr);
Marshal.FreeHGlobal(variantPtr);
}
}
