public HResult BeginCreateObject(
IMFByteStream pByteStream,
string pwszURL,
MFResolution dwFlags,
IPropertyStore pProps, // Can be NULL.
out object ppIUnknownCancelCookie, // Can be NULL.
IMFAsyncCallback pCallback,
object punkState // Can be NULL
)
{
// Make sure we *never* leave this entry point with an exception
try
{
HResult hr;
m_Log.WriteLine("BeginCreateObject");
ppIUnknownCancelCookie = null; // We don't return a cancellation cookie.
if ((pByteStream == null) || (pwszURL == null) || (pCallback == null))
{
throw new COMException("bad stream, url, or callback", (int)HResult.E_INVALIDARG);
}
IMFAsyncResult pResult = null;
WavSource pSource = new WavSource();
pSource.Open(pByteStream);
hr = MFExtern.MFCreateAsyncResult(pSource as IMFMediaSource, pCallback, punkState, out pResult);
MFError.ThrowExceptionForHR(hr);
hr = MFExtern.MFInvokeCallback(pResult);
MFError.ThrowExceptionForHR(hr);
if (pResult != null)
{
Marshal.ReleaseComObject(pResult);
}
return(HResult.S_OK);
}
catch (Exception e)
{
ppIUnknownCancelCookie = null;
return((HResult)Marshal.GetHRForException(e));
}
}
public HResult BeginCreateObject(string pwszURL,
MFResolution dwFlags,
IPropertyStore pProps,
out object ppIUnknownCancelCookie,
IMFAsyncCallback pCallback,
object pUnkState)
{
// The constructor launches an async connect to the url.
IcyScheme ice = new IcyScheme(pwszURL);
IMFAsyncResult pResult;
MFError hrthrowonerror = MFExtern.MFCreateAsyncResult(
ice, pCallback, pUnkState, out pResult);
ppIUnknownCancelCookie = ice;
hrthrowonerror = MFExtern.MFInvokeCallback(pResult);
return(HResult.S_OK);
}
/// <summary>
/// Creates a byte stream from a URL.
/// </summary>
/// <param name="sourceResolver">A valid IMFSourceResolver instance.</param>
/// <param name="url">A string that contains the URL to resolve.</param>
/// <param name="flags">One or more members of the MFResolution enumeration.</param>
/// <param name="properties">An instance of the IPropertyStore interface of a property store. The method passes the property store to the scheme handler or byte-stream handler that creates the object.</param>
/// <param name="byteStream">Receives a byte stream that can handle the media file targeted by <paramref name="url"/>.</param>
/// <returns>If this function succeeds, it returns the S_OK member. Otherwise, it returns another HResult's member that describe the error.</returns>
public static HResult CreateObjectFromURL(this IMFSourceResolver sourceResolver, string url, MFResolution flags, IPropertyStore properties, out IMFByteStream byteStream)
{
if (sourceResolver == null)
{
throw new ArgumentNullException("sourceResolver");
}
flags &= ~MFResolution.MediaSource;
flags |= MFResolution.ByteStream;
MFObjectType objectType;
object tmp;
HResult hr = sourceResolver.CreateObjectFromURL(url, flags, properties, out objectType, out tmp);
byteStream = hr.Succeeded() ? tmp as IMFByteStream : null;
return(hr);
}
/// <summary>
/// Creates a media source from a Uri.
/// </summary>
/// <param name="sourceResolver">A valid IMFSourceResolver instance.</param>
/// <param name="url">A Uri that contains the URL to resolve.</param>
/// <param name="flags">One or more members of the MFResolution enumeration.</param>
/// <param name="properties">An instance of the IPropertyStore interface of a property store. The method passes the property store to the scheme handler or byte-stream handler that creates the object.</param>
/// <param name="mediaSource">Receives a media source that can handle the media file targeted by <paramref name="url"/>.</param>
/// <returns>If this function succeeds, it returns the S_OK member. Otherwise, it returns another HResult's member that describe the error.</returns>
public static HResult CreateObjectFromURL(this IMFSourceResolver sourceResolver, Uri url, MFResolution flags, IPropertyStore properties, out IMFMediaSource mediaSource)
{
return(CreateObjectFromURL(sourceResolver, url.ToString(), flags, properties, out mediaSource));
}
/// <summary>
/// Creates a media source from a byte stream.
/// </summary>
/// <param name="sourceResolver">A valid IMFSourceResolver instance.</param>
/// <param name="byteStream">An instance of the byte stream's IMFByteStream interface.</param>
/// <param name="flags">One or more members of the MFResolution enumeration.</param>
/// <param name="properties">An instance of the IPropertyStore interface of a property store. The method passes the property store to the scheme handler or byte-stream handler that creates the object.</param>
/// <param name="mediaSource">Receives a media source that can handle the provided byte stream.</param>
/// <returns>If this function succeeds, it returns the S_OK member. Otherwise, it returns another HResult's member that describe the error.</returns>
public static HResult CreateObjectFromByteStream(this IMFSourceResolver sourceResolver, IMFByteStream byteStream, MFResolution flags, IPropertyStore properties, out IMFMediaSource mediaSource)
{
return(CreateObjectFromByteStream(sourceResolver, byteStream, (string)null, flags, properties, out mediaSource));
}
public int BeginCreateObject(
IMFByteStream pByteStream,
string pwszURL,
MFResolution dwFlags,
IPropertyStore pProps, // Can be NULL.
out object ppIUnknownCancelCookie, // Can be NULL.
IMFAsyncCallback pCallback,
object punkState // Can be NULL
)
{
// Make sure we *never* leave this entry point with an exception
try
{
int hr;
m_Log.WriteLine("BeginCreateObject");
ppIUnknownCancelCookie = null; // We don't return a cancellation cookie.
if ((pByteStream == null) || (pwszURL == null) || (pCallback == null))
{
throw new COMException("bad stream, url, or callback", E_InvalidArgument);
}
IMFAsyncResult pResult = null;
WavSource pSource = new WavSource();
pSource.Open(pByteStream);
hr = MFExtern.MFCreateAsyncResult(pSource as IMFMediaSource, pCallback, punkState, out pResult);
MFError.ThrowExceptionForHR(hr);
hr = MFExtern.MFInvokeCallback(pResult);
MFError.ThrowExceptionForHR(hr);
if (pResult != null)
{
Marshal.ReleaseComObject(pResult);
}
return S_Ok;
}
catch (Exception e)
{
ppIUnknownCancelCookie = null;
return Marshal.GetHRForException(e);
}
}
