private void AddTransforms(IEnumerable<IMFActivate> effects, string type)
{
foreach (var mft in effects)
{
int attributeCount;
mft.GetCount(out attributeCount);
var sb = new StringBuilder();
sb.AppendFormat(type);
sb.AppendLine();
for (int n = 0; n < attributeCount; n++)
{
Guid key;
var value = new PropVariant();
mft.GetItemByIndex(n, out key, ref value);
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();
}
value.Clear();
}
Transforms.Add(sb.ToString());
}
}
private string DescribeMediaType(IMFMediaType mediaType)
{
int attributeCount;
mediaType.GetCount(out attributeCount);
var sb = new StringBuilder();
for (int n = 0; n < attributeCount; n++)
{
Guid key;
var val = new PropVariant();
mediaType.GetItemByIndex(n, out key, ref val);
string propertyName = FieldDescriptionHelper.Describe(typeof(MediaFoundationAttributes), key);
sb.AppendFormat("{0}={1}\r\n", propertyName, val.Value);
val.Clear();
}
return sb.ToString();
}