private void TestAttr()
{
short i1, i2;
short wStream = 0;
m_head.GetAttributeCount(wStream, out i1);
m_head.SetAttribute(wStream, "asdf", AttrDataType.DWORD, BitConverter.GetBytes(1234), 4);
m_head.SetAttribute(wStream, "fdsa", AttrDataType.DWORD, BitConverter.GetBytes(4321), 4);
m_head.GetAttributeCount(wStream, out i2);
Debug.Assert(i2 - i1 == 2);
short pLen = 0;
AttrDataType pType;
m_head.GetAttributeByName(ref wStream, "asdf", out pType, null, ref pLen);
byte [] b = new byte[pLen];
m_head.GetAttributeByName(ref wStream, "asdf", out pType, b, ref pLen);
Debug.Assert(BitConverter.ToInt32(b, 0) == 1234);
short sNameLen = 0;
m_head.GetAttributeByIndex((short)(i1 + 1), ref wStream, null, ref sNameLen, out pType, null, ref pLen);
StringBuilder sb = new StringBuilder(sNameLen);
byte [] b2 = new byte[pLen];
m_head.GetAttributeByIndex((short)(i1 + 1), ref wStream, sb, ref sNameLen, out pType, b2, ref pLen);
Debug.Assert(sb.ToString() == "fdsa" && pType == AttrDataType.DWORD && BitConverter.ToInt32(b2, 0) == 4321);
}
/// <summary>
/// Get the header attribute by name and by stream number. Wraps IWMHeaderInfo.GetAttributeByName
/// </summary>
/// <param name="StreamNumber">Stream numer. Zero means file level attributes</param>
/// <param name="name">Nma of the desired attribute</param>
/// <returns>Desired attribute <see cref="WM_Attr"/></returns>
public WM_Attr GetAttribute(int StreamNumber, string name)
{
ushort stream = (ushort)StreamNumber;
ushort datalen = 0;
object obj;
WMT_ATTR_DATATYPE type;
m_HeaderInfo.GetAttributeByName(ref stream, name, out type, IntPtr.Zero, ref datalen);
switch (type)
{
case WMT_ATTR_DATATYPE.WMT_TYPE_BOOL:
case WMT_ATTR_DATATYPE.WMT_TYPE_DWORD:
obj = (uint)0;
break;
case WMT_ATTR_DATATYPE.WMT_TYPE_GUID:
obj = Guid.NewGuid();
break;
case WMT_ATTR_DATATYPE.WMT_TYPE_QWORD:
obj = (ulong)0;
break;
case WMT_ATTR_DATATYPE.WMT_TYPE_WORD:
obj = (ushort)0;
break;
case WMT_ATTR_DATATYPE.WMT_TYPE_STRING:
case WMT_ATTR_DATATYPE.WMT_TYPE_BINARY:
obj = new byte[datalen];
break;
default:
throw new InvalidOperationException(string.Format("Not supported data type: {0}", type.ToString()));
}
GCHandle h = GCHandle.Alloc(obj, GCHandleType.Pinned);
try
{
IntPtr ptr = h.AddrOfPinnedObject();
m_HeaderInfo.GetAttributeByName(ref stream, name, out type, ptr, ref datalen);
switch (type)
{
case WMT_ATTR_DATATYPE.WMT_TYPE_STRING:
obj = Marshal.PtrToStringUni(ptr);
break;
case WMT_ATTR_DATATYPE.WMT_TYPE_BOOL:
obj = ((uint)obj != 0);
break;
}
}
finally
{
h.Free();
}
return(new WM_Attr(name, type, obj));
}
// Use IWMMetadataEditor interface to access
// StreamNumber attribute
///////////////////////////////////////////////////////////////////////////////
void GetBoolAttribsFromEditor(IWMHeaderInfo pHeaderInfo, string pwszName, out bool pResult)
{
AttrDataType wmType;
short wStreamNum = 0;
short cbLen = 0;
pHeaderInfo.GetAttributeByName(ref wStreamNum, pwszName, out wmType, null, ref cbLen);
byte[] pData = new byte[cbLen];
pHeaderInfo.GetAttributeByName(ref wStreamNum, pwszName, out wmType, pData, ref cbLen);
pResult = BitConverter.ToBoolean(pData, 0);
}
private void GetHeaderAttribute(string pwszName, out byte[] ppbValue)
{
AttrDataType wmtType;
short cbLength = 0;
short wAnyStream = 0;
ppbValue = null;
//
// Sanity check
//
if (null == m_pHeaderInfo)
{
throw new COMException("Instance has been Disposed", E_Unexpected);
}
//
// Get the count of bytes to be allocated for pbValue
//
m_pHeaderInfo.GetAttributeByName(ref wAnyStream,
pwszName,
out wmtType,
null,
ref cbLength);
ppbValue = new byte[cbLength];
//
// Get the actual value
//
m_pHeaderInfo.GetAttributeByName(ref wAnyStream,
pwszName,
out wmtType,
ppbValue,
ref cbLength);
}
//------------------------------------------------------------------------------
// Name: CWMVCopy::CreateReader()
// Desc: Creates a reader and opens the source file using this reader.
//------------------------------------------------------------------------------
protected void CreateReader(string pwszInputFile)
{
Console.WriteLine("Creating the Reader...");
//
// Create a reader
//
WMUtils.WMCreateReader(IntPtr.Zero, 0, out m_pReader);
//
// Get the IWMReaderAdvanced interface
//
m_pReaderAdvanced = m_pReader as IWMReaderAdvanced;
//
// Get the IWMHeaderInfo interface of the reader
//
m_pReaderHeaderInfo = m_pReader as IWMHeaderInfo;
//
// Open the reader; use "this" as the callback interface.
//
m_pReader.Open(pwszInputFile, this, IntPtr.Zero);
//
// Wait until WMT_OPENED status message is received in OnStatus()
//
WaitForCompletion();
//
// Get the duration of the source file
//
short wStreamNumber = 0;
AttrDataType enumType;
short cbLength = 8; // sizeof(m_qwDuration);
byte[] b = new byte[cbLength];
m_pReaderHeaderInfo.GetAttributeByName(ref wStreamNumber,
Constants.g_wszWMDuration,
out enumType,
b,
ref cbLength);
m_qwDuration = BitConverter.ToInt64(b, 0);
if (m_qwDuration == 0)
{
throw new COMException("Duration is zero", E_InvalidArgument);
}
//
// Turn on the user clock
//
m_pReaderAdvanced.SetUserProvidedClock(true);
//
// Turn on manual stream selection, so we get all streams.
//
m_pReaderAdvanced.SetManualStreamSelection(true);
}
// Use IWMMetadataEditor interface to access
// StreamNumber attribute
///////////////////////////////////////////////////////////////////////////////
void GetBoolAttribsFromEditor(IWMHeaderInfo pHeaderInfo, string pwszName, out bool pResult)
{
AttrDataType wmType;
short wStreamNum = 0;
short cbLen = 0;
pHeaderInfo.GetAttributeByName(ref wStreamNum, pwszName, out wmType, null, ref cbLen);
byte[] pData = new byte[cbLen];
pHeaderInfo.GetAttributeByName(ref wStreamNum, pwszName, out wmType, pData, ref cbLen);
pResult = BitConverter.ToBoolean(pData, 0);
}