private void TestAttr()
{
short w1, w2, w3;
short iIndex;
const string v = "ItzaString";
m_head.GetAttributeCountEx(0, out w1);
byte[] b = Encoding.Unicode.GetBytes(v);
m_head.AddAttribute(0, "asdf", out iIndex, AttrDataType.STRING, 0, b, b.Length);
m_head.GetAttributeCountEx(0, out w2);
Debug.Assert(w2 == w1 + 1);
short pNLen = 0;
int pDLen = 0;
AttrDataType pType;
short pLang;
m_head.GetAttributeByIndexEx(0, w1, null, ref pNLen, out pType, out pLang, null, ref pDLen);
byte[] bb = new byte[pDLen];
m_head.GetAttributeByIndexEx(0, w1, null, ref pNLen, out pType, out pLang, bb, ref pDLen);
string ss = Encoding.Unicode.GetString(bb, 0, pDLen - 2);
StringBuilder sbName = new StringBuilder(pNLen);
byte[] bb2 = new byte[pDLen];
m_head.GetAttributeByIndexEx(0, w1, sbName, ref pNLen, out pType, out pLang, bb2, ref pDLen);
Debug.Assert(sbName.ToString() == "asdf" && pType == AttrDataType.STRING && pLang == 0 && v == Encoding.Unicode.GetString(bb2, 0, v.Length * 2));
byte[] wm3 = BitConverter.GetBytes(4144);;
m_head.ModifyAttribute(0, w1, AttrDataType.DWORD, 0, wm3, 4);
byte[] bb4 = new byte[pDLen];
m_head.GetAttributeByIndexEx(0, w1, null, ref pNLen, out pType, out pLang, bb4, ref pDLen);
Debug.Assert(BitConverter.ToInt32(bb4, 0) == 4144);
m_head.DeleteAttribute(0, w1);
m_head.GetAttributeCountEx(0, out w3);
Debug.Assert(w3 == w1);
}
public Metadata GetMetadata(object target)
{
if (target == null || !(target is string))
{
return(null);
}
string filename = target.ToString();
IWMMetadataEditor2 metadataEditor = null;
IWMSyncReader syncReader = null;
WMMetadata metadata = new WMMetadata();
try
{
WMFSDKFunctions.WMCreateEditor(out metadataEditor);
metadataEditor.OpenEx(filename, FILE_ACCESS.GENERIC_READ, FILE_SHARE.FILE_SHARE_NONE);
IWMHeaderInfo3 header = (IWMHeaderInfo3)metadataEditor;
ushort attributeCount;
header.GetAttributeCountEx(StreamNumber, out attributeCount);
for (int i = 0; i < attributeCount; i++)
{
MetadataField metadataField = GetAttributeByIndex(header, i);
metadata.AddMetadataField(metadataField);
}
}
catch (COMException ex)
{
// TODO: Logging
}
finally
{
if (metadataEditor != null)
{
metadataEditor.Close();
Marshal.FinalReleaseComObject(metadataEditor);
metadataEditor = null;
}
}
try
{
WMFSDKFunctions.WMCreateSyncReader(IntPtr.Zero, WMT_RIGHTS.WMT_RIGHT_PLAYBACK, out syncReader);
syncReader.Open(filename);
int outputCount;
syncReader.GetOutputCount(out outputCount);
IWMOutputMediaProps outputMediaProps = null;
for (uint i = 0; i < outputCount; i++)
{
IWMOutputMediaProps innerOutputMediaProps;
syncReader.GetOutputProps(i, out innerOutputMediaProps);
Guid type;
innerOutputMediaProps.GetType(out type);
if (type == WMFSDKFunctions.WMMEDIATYPE_Video)
{
outputMediaProps = innerOutputMediaProps;
break;
}
}
if (outputMediaProps != null)
{
int pcbType = 0;
outputMediaProps.GetMediaType(IntPtr.Zero, ref pcbType);
IntPtr mediaTypeBufferPtr = Marshal.AllocHGlobal(pcbType);
outputMediaProps.GetMediaType(mediaTypeBufferPtr, ref pcbType);
WM_MEDIA_TYPE mediaType = new WM_MEDIA_TYPE();
WMVIDEOINFOHEADER videoInfoHeader = new WMVIDEOINFOHEADER();
Marshal.PtrToStructure(mediaTypeBufferPtr, mediaType);
Marshal.FreeHGlobal(mediaTypeBufferPtr);
Marshal.PtrToStructure(mediaType.pbFormat, videoInfoHeader);
double frameRate = Math.Round((double)10000000 / videoInfoHeader.AvgTimePerFrame, 2);
metadata.AddMetadataField(new MetadataField("FrameRate", frameRate));
}
}
catch (COMException ex)
{
// TODO: Logging
}
finally
{
if (syncReader != null)
{
syncReader.Close();
Marshal.FinalReleaseComObject(syncReader);
syncReader = null;
}
}
return(metadata);
}