public HRESULT GetItemByIndex(uint unIndex, out Guid pguidKey, PropVariant pValue)
{
var hr = _type.GetItemByIndex(unIndex, out pguidKey, pValue);
Trace("index: " + unIndex + " guid: " + pguidKey.ToName() + " value: " + (pValue != null ? pValue.ToString() : "<null>") + " hr: " + hr);
return(hr);
}
public static IEnumerable <KeyValuePair <Guid, _MF_ATTRIBUTE_TYPE> > Enumerate(this IMFMediaType input)
{
if (input == null)
{
yield break;
}
for (var i = 0; i < Count(input); i++)
{
input.GetItemByIndex((uint)i, out Guid guid, null).ThrowOnError();
input.GetItemType(guid, out var type).ThrowOnError();
yield return(new KeyValuePair <Guid, _MF_ATTRIBUTE_TYPE>(guid, type));
}
}
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();
}
private static void DescribeAttribute(IMFMediaType mediaType, int n, StringBuilder sb)
{
var variantPtr = Marshal.AllocHGlobal(MarshalHelpers.SizeOf<PropVariant>());
try
{
Guid key;
mediaType.GetItemByIndex(n, out key, variantPtr);
var val = MarshalHelpers.PtrToStructure<PropVariant>(variantPtr);
string propertyName = FieldDescriptionHelper.Describe(typeof (MediaFoundationAttributes), key);
sb.AppendFormat("{0}={1}\r\n", propertyName, val.Value);
}
finally
{
PropVariant.Clear(variantPtr);
Marshal.FreeHGlobal(variantPtr);
}
}
private static void DescribeAttribute(IMFMediaType mediaType, int n, StringBuilder sb)
{
var variantPtr = Marshal.AllocHGlobal(MarshalHelpers.SizeOf <PropVariant>());
try
{
Guid key;
mediaType.GetItemByIndex(n, out key, variantPtr);
var val = MarshalHelpers.PtrToStructure <PropVariant>(variantPtr);
string propertyName = FieldDescriptionHelper.Describe(typeof(MediaFoundationAttributes), key);
sb.AppendFormat("{0}={1}\r\n", propertyName, val.Value);
}
finally
{
PropVariant.Clear(variantPtr);
Marshal.FreeHGlobal(variantPtr);
}
}
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());
}