/// <summary>
/// Enumerates available filters and returns a list of <see cref="CodecInfo"/>.
/// </summary>
/// <param name="filterCategory">GUID of filter category (<see cref="DirectShowLib.FilterCategory"/> members)></param>
/// <returns></returns>
public static List <CodecInfo> GetFiltersForCategory(Guid filterCategory)
{
List <CodecInfo> codecInfos = new List <CodecInfo>();
ICreateDevEnum devEnum = null;
IEnumMoniker enumMoniker = null;
try
{
devEnum = (ICreateDevEnum) new CreateDevEnum();
int catResult = devEnum.CreateClassEnumerator(filterCategory, out enumMoniker, CDef.None);
if (catResult == 0)
{
IMoniker[] moniker = new IMoniker[1];
while (enumMoniker.Next(1, moniker, IntPtr.Zero) == 0)
{
string filterName = FilterGraphTools.GetFriendlyName(moniker[0]);
Guid filterClassId = FilterGraphTools.GetCLSID(moniker[0]);
CodecInfo codecInfo = new CodecInfo(filterName, filterClassId);
codecInfos.Add(codecInfo);
FilterGraphTools.TryRelease(ref moniker[0]);
}
}
codecInfos.Sort();
return(codecInfos);
}
finally
{
FilterGraphTools.TryRelease(ref enumMoniker);
FilterGraphTools.TryRelease(ref devEnum);
}
}
/// <summary>
/// Gets a list of DirectShow filter names that accept the passed MediaType/MediaSubType and output the passed MediaType/MediaSubType.
/// </summary>
/// <param name="inputMediaAndSubTypes">Array of MediaType/MediaSubType</param>
/// <param name="outputMediaAndSubTypes">Array of MediaType/MediaSubType</param>
/// <param name="merit"></param>
/// <returns>List of names</returns>
public static List <CodecInfo> GetFilters(Guid[] inputMediaAndSubTypes, Guid[] outputMediaAndSubTypes, Merit merit)
{
List <CodecInfo> filters = new List <CodecInfo>();
IEnumMoniker enumMoniker = null;
IMoniker[] moniker = new IMoniker[1];
IFilterMapper2 mapper = (IFilterMapper2) new FilterMapper2();
try
{
mapper.EnumMatchingFilters(
out enumMoniker,
0,
true,
merit,
true,
inputMediaAndSubTypes.Length,
inputMediaAndSubTypes,
null,
null,
false,
true,
outputMediaAndSubTypes.Length,
outputMediaAndSubTypes,
null,
null);
do
{
try { enumMoniker.Next(1, moniker, IntPtr.Zero); }
catch { }
if ((moniker[0] == null))
{
break;
}
string filterName = FilterGraphTools.GetFriendlyName(moniker[0]);
Guid filterClassId = FilterGraphTools.GetCLSID(moniker[0]);
CodecInfo codecInfo = new CodecInfo(filterName, filterClassId);
filters.Add(codecInfo);
FilterGraphTools.TryRelease(ref moniker[0]);
} while (true);
filters.Sort();
return(filters);
}
finally
{
FilterGraphTools.TryRelease(ref enumMoniker);
FilterGraphTools.TryRelease(ref mapper);
}
}
