Method CanGetFrame
From AVObjects Knowledge Base
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Latest revision as of 08:50, 11 July 2014
This page is a copy of the original page on the AVObjects' web site and can also be viewed here.
The method checks the ability to get data from AV object.
HRESULT CanGetFrame( [in] int nStream, [in] DWORD nWait );
Parameters:
nStream Number of stream nWait Response time in microseconds.
Returns:
S_OK Object ready for get data S_FALSE Object is busy HRESULT_FROM_WIN32(ERROR_HANDLE_EOF) End of stream E_INVALIDARG One or more arguments are invalid E_FAIL Object not initialized yet or other failure.
Copy stream
//BYTE* pbBuffer - pointer to frame buffer //DWORD cbBuffer - size of frane buffer in bytes //int nStream - index of stream HRESULT hr = S_OK; while(1) { hr = spDest->CanPutFrame(nStream, INFINITE); if ( hr != S_OK ) return hr; hr = spSource->CanGetFrame(nStream, INFINITE); if (hr != S_OK) return hr; DWORD cbActual = 0; REFERENCE_TIME tS = 0, tE = 0; DWORD dwFlags = 0; hr = spSource->GetFrame(nStream, pbBuffer, cbBuffer, &cbActual, &dwFlags, &tS, &tE, NULL); if (hr == S_OK) { hr = spDest->PutFrame(nStream, m_pbBuffer, cbActual, dwFlags, tS, tE, NULL); } else if (hr == HRESULT_FROM_WIN32(ERROR_HANDLE_EOF)) { // EOS, put empty frame to dest hr = spDest->PutFrame(nStream, NULL, 0, 0, 0, 0, NULL); if (hr == S_OK) return hr; } if (FAILED(hr)) return hr; }
