Prepares the media source.

Namespace:  Microsoft.Rtc.Collaboration.AudioVideo
Assembly:  Microsoft.Rtc.Collaboration(in Microsoft.Rtc.Collaboration.dll)

Syntax

Visual Basic (Declaration) 
Public 
Function 
BeginPrepareSource ( _
	
mode 
As 

MediaSourceOpenMode, _
	
userCallback 
As 
AsyncCallback, _
	
state 
As 
Object _
) 
As 
IAsyncResult
C# 
public 
IAsyncResult 
BeginPrepareSource(
	

MediaSourceOpenMode 
mode,
	
AsyncCallback 
userCallback,
	
Object 
state
)
Visual C++ 
public:
IAsyncResult^ 
BeginPrepareSource(
	

MediaSourceOpenMode 
mode, 
	
AsyncCallback^ 
userCallback, 
	
Object^ 
state
)
JavaScript 
function 
beginPrepareSource(
mode, 
userCallback, 
state);

Parameters

mode
Type: Microsoft.Rtc.Collaboration.AudioVideo . . :: . MediaSourceOpenMode
The open mode.
userCallback
Type: AsyncCallback
The method to be called when the asynchronous operation is completed.
state
Type: Object
A user-provided object that distinguishes this particular asynchronous operation from other asynchronous operations.

Return Value

An IAsyncResult that references the asynchronous operation.

Remarks

An application must call this method before any Player begins playing a MediaSource. The application must also call EndPrepareSource.

Exceptions

Exception Condition
ArgumentOutOfRangeException Thrown when the mode argument is not a value in the MediaSourceOpenMode enumerated type.
InvalidOperationException Thrown when the audio/video platform is not initialized.

See Also