/** Asyncronous callback */
STDMETHODIMP FImfByteStream::Invoke( IMFAsyncResult* pResult )
{
HRESULT HResult = S_OK;
IUnknown* State = NULL;
IUnknown* Unknown = NULL;
IMFAsyncResult* CallerResult = NULL;
AsyncReadState* Op = NULL;
HResult = pResult->GetState( &State );
check( SUCCEEDED( HResult ) );
HResult = State->QueryInterface( IID_PPV_ARGS( &CallerResult ) );
check( SUCCEEDED( HResult ) );
HResult = CallerResult->GetObject( &Unknown );
check( SUCCEEDED( HResult ) );
Op = static_cast<AsyncReadState*>( Unknown );
/* Do actual read */
ULONG cbRead;
Read( Op->GetBuffer( ), Op->GetCount( ) - Op->GetBytesRead( ), &cbRead );
Op->SetBytesRead( cbRead + Op->GetBytesRead( ) );
if( CallerResult )
{
CallerResult->SetStatus( HResult );
MFInvokeCallback( CallerResult );
}
if( State != NULL ) { State->Release( ); }
if( Unknown != NULL ) { Unknown->Release( ); }
if( CallerResult != NULL ){ CallerResult->Release( ); }
return S_OK;
}
/** Ends an asyncronous read */
STDMETHODIMP FImfByteStream::EndRead( IMFAsyncResult* pResult, ULONG* pcbRead )
{
if( !pcbRead )
return E_INVALIDARG;
IUnknown* Unknown;
pResult->GetObject( &Unknown );
AsyncReadState* State = static_cast<AsyncReadState*>( Unknown );
*pcbRead = State->GetBytesRead( );
Unknown->Release( );
IsCurrentlyReading = false;
return S_OK;
}