/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Gets a list of all attributes contained in a media type and displays
/// them as a human readable name. More or less just for practice
///
/// Adapted from
/// https://msdn.microsoft.com/en-us/library/windows/desktop/ee663602(v=vs.85).aspx
/// </summary>
/// <returns>S_OK for success, nz for fail</returns>
/// <param name="mediaTypeObj">the media type object</param>
/// <param name="maxAttributes">the maximum number of attributes</param>
/// <param name="outSb">The output string</param>
/// <param name="ignoreMajorType">if true we ignore the major type attribute</param>
/// <param name="ignoreSubType">if true we ignore the sub type attribute</param>
/// <history>
/// 01 Nov 18 Cynic - Started
/// </history>
public static HResult EnumerateAllAttributeNamesInMediaTypeAsText(IMFMediaType mediaTypeObj, bool ignoreMajorType, bool ignoreSubType, int maxAttributes, out StringBuilder outSb)
{
// we always return something here
outSb = new StringBuilder();
// sanity check
if (mediaTypeObj == null)
{
return(HResult.E_FAIL);
}
if ((mediaTypeObj is IMFAttributes) == false)
{
return(HResult.E_FAIL);
}
// set up to ignore
List <string> attributesToIgnore = new List <string>();
if (ignoreMajorType == true)
{
attributesToIgnore.Add("MF_MT_MAJOR_TYPE");
}
if (ignoreSubType == true)
{
attributesToIgnore.Add("MF_MT_SUBTYPE");
}
// just call the generic TantaWMFUtils Attribute Enumerator
return(TantaWMFUtils.EnumerateAllAttributeNamesAsText((mediaTypeObj as IMFAttributes), attributesToIgnore, maxAttributes, out outSb));
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Displays the transforms for the currently selected category. Since each
/// </summary>
/// <history>
/// 01 Nov 18 Cynic - Started
/// </history>
private void DisplayTransformsForCurrentCategory()
{
int numResults;
IMFActivate[] activatorArray;
List <TantaMFTCapabilityContainer> transformList = new List <TantaMFTCapabilityContainer>();
HResult hr;
try
{
// clear what we have now
listViewAvailableTransforms.Clear();
// reset this
listViewAvailableTransforms.ListViewItemSorter = null;
// get the currently selected major category
TantaGuidNamePair currentCategory = (TantaGuidNamePair)comboBoxTransformCategories.SelectedItem;
if (currentCategory == null)
{
return;
}
// we have multiple sub-categories. These are set by specific flags on the MFTEnumX call. We iterate
// through each flag and get the matching transforms. If we already have it we just set the flag on
// the exisiting one to show it is in multiple sub-categories
foreach (MFT_EnumFlag flagVal in Enum.GetValues(typeof(MFT_EnumFlag)))
{
// we do not need this one
if (flagVal == MFT_EnumFlag.None)
{
continue;
}
// The documentation states that there is no way to enumerate just local MFTs and nothing else.
// Setting Flags equal to MFT_ENUM_FLAG_LOCALMFT is equivalent to including the MFT_ENUM_FLAG_SYNCMFT flag
// which messes us up. This also appears to be true for the FieldOfUse and transcode only flags so we
// do not include them
if (flagVal == MFT_EnumFlag.LocalMFT)
{
continue;
}
if (flagVal == MFT_EnumFlag.FieldOfUse)
{
continue;
}
if (flagVal == MFT_EnumFlag.TranscodeOnly)
{
continue;
}
// some of the higher flags are just for sorting the return results
if (flagVal >= MFT_EnumFlag.All)
{
break;
}
hr = MFExtern.MFTEnumEx(currentCategory.GuidValue, flagVal, null, null, out activatorArray, out numResults);
if (hr != HResult.S_OK)
{
throw new Exception("DisplayTransformsForCurrentCategory, call to MFExtern.MFTEnumEx failed. HR=" + hr.ToString());
}
// now loop through the returned activators
for (int i = 0; i < numResults; i++)
{
// extract the friendlyName and symbolicLinkName
Guid outGuid = TantaWMFUtils.GetGuidForKeyFromActivator(activatorArray[i], MFAttributesClsid.MFT_TRANSFORM_CLSID_Attribute);
string friendlyName = TantaWMFUtils.GetStringForKeyFromActivator(activatorArray[i], MFAttributesClsid.MFT_FRIENDLY_NAME_Attribute);
// create a new TantaMFTCapabilityContainer for it
TantaMFTCapabilityContainer workingMFTContainer = new TantaMFTCapabilityContainer(friendlyName, outGuid, currentCategory);
// do we have this in our list yet
int index = transformList.FindIndex(x => x.TransformGuidValue == workingMFTContainer.TransformGuidValue);
if (index >= 0)
{
// yes, it does contain this transform, just record the new sub-category
transformList[index].EnumFlags |= flagVal;
}
else
{
// no, it does not contain this transform yet, set the sub-category
workingMFTContainer.EnumFlags = flagVal;
// and add it
transformList.Add(workingMFTContainer);
if ((activatorArray[i] is IMFAttributes) == true)
{
StringBuilder outSb = null;
List <string> attributesToIgnore = new List <string>();
attributesToIgnore.Add("MFT_FRIENDLY_NAME_Attribute");
attributesToIgnore.Add("MFT_TRANSFORM_CLSID_Attribute");
attributesToIgnore.Add("MF_TRANSFORM_FLAGS_Attribute");
attributesToIgnore.Add("MF_TRANSFORM_CATEGORY_Attribute");
hr = TantaWMFUtils.EnumerateAllAttributeNamesAsText((activatorArray[i] as IMFAttributes), attributesToIgnore, 100, out outSb);
}
}
// clean up our activator
Marshal.ReleaseComObject(activatorArray[i]);
}
}
// now display the transforms
foreach (TantaMFTCapabilityContainer mftCapability in transformList)
{
ListViewItem lvi = new ListViewItem(new[] { mftCapability.TransformFriendlyName, mftCapability.IsSyncMFT, mftCapability.IsAsyncMFT, mftCapability.IsHardware, /* mftCapability.IsFieldOfUse, mftCapability.IsLocalMFT, mftCapability.IsTranscodeOnly, */ mftCapability.TransformGuidValueAsString });
lvi.Tag = mftCapability;
listViewAvailableTransforms.Items.Add(lvi);
}
listViewAvailableTransforms.Columns.Add("Name", 250);
listViewAvailableTransforms.Columns.Add("IsSyncMFT", 70);
listViewAvailableTransforms.Columns.Add("IsAsyncMFT", 90);
listViewAvailableTransforms.Columns.Add("IsHardware", 90);
// listViewAvailableTransforms.Columns.Add("IsFieldOfUse", 90);
// listViewAvailableTransforms.Columns.Add("IsLocalMFT", 90);
// listViewAvailableTransforms.Columns.Add("IsTranscodeOnly", 90);
listViewAvailableTransforms.Columns.Add("Guid", 200);
}
finally
{
}
}