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114 lines
4.5 KiB
114 lines
4.5 KiB
//==========================================================================;
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//
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// bcasteventimpl.h : additional infrastructure to support implementing IMSVidGraphSegment for
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// playback segments
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// nicely from c++
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// Copyright (c) Microsoft Corporation 1999.
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//
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/////////////////////////////////////////////////////////////////////////////
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#pragma once
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#ifndef BCASTEVENTIMPL_H
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#define BCASTEVENTIMPL_H
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namespace MSVideoControl {
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template<class T>
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class DECLSPEC_NOVTABLE IBroadcastEventImpl : public IBroadcastEvent {
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protected:
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PQBroadcastEvent m_pBcast;
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DWORD m_dwEventCookie;
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public:
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IBroadcastEventImpl<T>() : m_dwEventCookie(0) {}
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virtual ~IBroadcastEventImpl<T>() {}
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HRESULT RegisterService() {
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T* pT = static_cast<T*>(this);
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if (!pT->m_pGraph) {
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return E_UNEXPECTED;
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}
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if (!m_pBcast) {
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PQServiceProvider sp(pT->m_pGraph);
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if (!sp) {
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TRACELM(TRACE_ERROR, "BroadcastEventImpl::RegisterService() can't get service provider i/f");
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return ImplReportError(__uuidof(T), IDS_CANT_NOTIFY_CHANNEL_CHANGE, __uuidof(IBroadcastEvent), E_UNEXPECTED);
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}
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HRESULT hr = sp->QueryService(SID_SBroadcastEventService, IID_IBroadcastEvent, reinterpret_cast<LPVOID*>(&m_pBcast));
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if (FAILED(hr) || !m_pBcast) {
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hr = m_pBcast.CoCreateInstance(CLSID_BroadcastEventService, 0, CLSCTX_INPROC_SERVER);
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if (FAILED(hr)) {
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TRACELM(TRACE_ERROR, "BroadcastEventImpl::RegisterService() can't create bcast service");
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return ImplReportError(__uuidof(T), IDS_CANT_NOTIFY_CHANNEL_CHANGE, __uuidof(IBroadcastEvent), E_UNEXPECTED);
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}
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PQRegisterServiceProvider rsp(pT->m_pGraph);
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if (!sp) {
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TRACELM(TRACE_ERROR, "BroadcastEventImpl::RegisterService() can't get get register service provider i/f");
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return ImplReportError(__uuidof(T), IDS_CANT_NOTIFY_CHANNEL_CHANGE, __uuidof(IBroadcastEvent), E_UNEXPECTED);
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}
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hr = rsp->RegisterService(SID_SBroadcastEventService, m_pBcast);
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if (FAILED(hr)) {
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TRACELSM(TRACE_ERROR, (dbgDump << "BroadcastEventImpl::RegisterService() can't get register service provider. hr = " << hexdump(hr)), "");
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return ImplReportError(__uuidof(T), IDS_CANT_NOTIFY_CHANNEL_CHANGE, __uuidof(IBroadcastEvent), E_UNEXPECTED);
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}
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}
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}
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return NOERROR;
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}
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HRESULT BroadcastFire(GUID2& eventid) {
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HRESULT hr = RegisterService();
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if (FAILED(hr)) {
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return hr;
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}
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ASSERT(m_pBcast);
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return m_pBcast->Fire(eventid);
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}
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HRESULT BroadcastAdvise() {
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HRESULT hr = RegisterService();
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if (FAILED(hr)) {
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return hr;
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}
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ASSERT(m_pBcast);
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PQConnectionPoint cp(m_pBcast);
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if (!cp) {
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TRACELSM(TRACE_ERROR, (dbgDump << "BroadcastEventImpl::Advise() can't QI event notification for connection point i/f. hr = " << hexdump(hr)), "");
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return ImplReportError(__uuidof(T), IDS_CANT_NOTIFY_CHANNEL_CHANGE, __uuidof(IBroadcastEvent), E_UNEXPECTED);
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}
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hr = cp->Advise(static_cast<IBroadcastEvent*>(this) /* IBroadcastEvent implementing event receiving object*/, &m_dwEventCookie);
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if (FAILED(hr)) {
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TRACELSM(TRACE_ERROR, (dbgDump << "BroadcastEventImpl::Advise() can't advise event notification. hr = " << hexdump(hr)), "");
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return ImplReportError(__uuidof(T), IDS_CANT_NOTIFY_CHANNEL_CHANGE, __uuidof(IBroadcastEvent), E_UNEXPECTED);
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}
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return NOERROR;
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}
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HRESULT BroadcastUnadvise() {
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if (m_pBcast && m_dwEventCookie) {
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PQConnectionPoint cp(m_pBcast);
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if (cp) {
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HRESULT hr = cp->Unadvise(m_dwEventCookie);
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if (FAILED(hr)) {
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TRACELSM(TRACE_ERROR, (dbgDump << "BroadcastEventImpl::Unadvise() can't unadvise event notification. hr = " << hexdump(hr)), "");
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}
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} else {
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TRACELM(TRACE_ERROR, "CMSVidBDATuner::Unload() can't QI event notification for connection point i/f.");
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}
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m_pBcast.Release();
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m_dwEventCookie = 0;
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}
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ASSERT(!m_pBcast && !m_dwEventCookie);
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return NOERROR;
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}
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};
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}; // namespace
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#endif
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// end of file - bcasteventimpl.h
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