794 lines
23 KiB
C++
794 lines
23 KiB
C++
//------------------------------------------------------------------------------
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// File: OutputQ.cpp
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//
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// Desc: DirectShow base classes - implements COutputQueue class used by an
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// output pin which may sometimes want to queue output samples on a
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// separate thread and sometimes call Receive() directly on the input
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// pin.
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//
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// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------------------------
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#include <streams.h>
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//
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// COutputQueue Constructor :
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//
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// Determines if a thread is to be created and creates resources
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//
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// pInputPin - the downstream input pin we're queueing samples to
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//
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// phr - changed to a failure code if this function fails
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// (otherwise unchanges)
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//
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// bAuto - Ask pInputPin if it can block in Receive by calling
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// its ReceiveCanBlock method and create a thread if
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// it can block, otherwise not.
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//
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// bQueue - if bAuto == FALSE then we create a thread if and only
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// if bQueue == TRUE
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//
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// lBatchSize - work in batches of lBatchSize
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//
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// bBatchEact - Use exact batch sizes so don't send until the
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// batch is full or SendAnyway() is called
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//
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// lListSize - If we create a thread make the list of samples queued
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// to the thread have this size cache
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//
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// dwPriority - If we create a thread set its priority to this
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//
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COutputQueue::COutputQueue(
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IPin *pInputPin, // Pin to send stuff to
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HRESULT *phr, // 'Return code'
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BOOL bAuto, // Ask pin if queue or not
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BOOL bQueue, // Send through queue
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LONG lBatchSize, // Batch
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BOOL bBatchExact, // Batch exactly to BatchSize
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LONG lListSize,
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DWORD dwPriority,
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bool bFlushingOpt // flushing optimization
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) : m_lBatchSize(lBatchSize),
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m_bBatchExact(bBatchExact && (lBatchSize > 1)),
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m_hThread(NULL),
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m_hSem(NULL),
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m_List(NULL),
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m_pPin(pInputPin),
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m_ppSamples(NULL),
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m_lWaiting(0),
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m_pInputPin(NULL),
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m_bSendAnyway(FALSE),
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m_nBatched(0),
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m_bFlushing(FALSE),
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m_bFlushed(TRUE),
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m_bFlushingOpt(bFlushingOpt),
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m_bTerminate(FALSE),
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m_hEventPop(NULL),
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m_hr(S_OK)
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{
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ASSERT(m_lBatchSize > 0);
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if (FAILED(*phr)) {
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return;
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}
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// Check the input pin is OK and cache its IMemInputPin interface
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*phr = pInputPin->QueryInterface(IID_IMemInputPin, (void **)&m_pInputPin);
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if (FAILED(*phr)) {
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return;
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}
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// See if we should ask the downstream pin
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if (bAuto) {
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HRESULT hr = m_pInputPin->ReceiveCanBlock();
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if (SUCCEEDED(hr)) {
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bQueue = hr == S_OK;
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}
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}
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// Create our sample batch
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m_ppSamples = new PMEDIASAMPLE[m_lBatchSize];
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if (m_ppSamples == NULL) {
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*phr = E_OUTOFMEMORY;
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return;
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}
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// If we're queueing allocate resources
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if (bQueue) {
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DbgLog((LOG_TRACE, 2, TEXT("Creating thread for output pin")));
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m_hSem = CreateSemaphore(NULL, 0, 0x7FFFFFFF, NULL);
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if (m_hSem == NULL) {
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DWORD dwError = GetLastError();
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*phr = AmHresultFromWin32(dwError);
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return;
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}
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m_List = new CSampleList(NAME("Sample Queue List"),
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lListSize,
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FALSE // No lock
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);
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if (m_List == NULL) {
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*phr = E_OUTOFMEMORY;
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return;
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}
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DWORD dwThreadId;
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m_hThread = CreateThread(NULL,
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0,
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InitialThreadProc,
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(LPVOID)this,
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0,
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&dwThreadId);
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if (m_hThread == NULL) {
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DWORD dwError = GetLastError();
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*phr = AmHresultFromWin32(dwError);
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return;
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}
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SetThreadPriority(m_hThread, dwPriority);
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} else {
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DbgLog((LOG_TRACE, 2, TEXT("Calling input pin directly - no thread")));
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}
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}
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//
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// COutputQueuee Destructor :
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//
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// Free all resources -
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//
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// Thread,
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// Batched samples
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//
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COutputQueue::~COutputQueue()
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{
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DbgLog((LOG_TRACE, 3, TEXT("COutputQueue::~COutputQueue")));
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/* Free our pointer */
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if (m_pInputPin != NULL) {
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m_pInputPin->Release();
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}
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if (m_hThread != NULL) {
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{
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CAutoLock lck(this);
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m_bTerminate = TRUE;
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m_hr = S_FALSE;
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NotifyThread();
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}
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DbgWaitForSingleObject(m_hThread);
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EXECUTE_ASSERT(CloseHandle(m_hThread));
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// The thread frees the samples when asked to terminate
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ASSERT(m_List->GetCount() == 0);
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delete m_List;
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} else {
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FreeSamples();
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}
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if (m_hSem != NULL) {
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EXECUTE_ASSERT(CloseHandle(m_hSem));
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}
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delete [] m_ppSamples;
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}
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//
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// Call the real thread proc as a member function
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//
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DWORD WINAPI COutputQueue::InitialThreadProc(LPVOID pv)
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{
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HRESULT hrCoInit = CAMThread::CoInitializeHelper();
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COutputQueue *pSampleQueue = (COutputQueue *)pv;
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DWORD dwReturn = pSampleQueue->ThreadProc();
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if(hrCoInit == S_OK) {
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CoUninitialize();
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}
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return dwReturn;
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}
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//
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// Thread sending the samples downstream :
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//
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// When there is nothing to do the thread sets m_lWaiting (while
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// holding the critical section) and then waits for m_hSem to be
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// set (not holding the critical section)
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//
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DWORD COutputQueue::ThreadProc()
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{
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while (TRUE) {
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BOOL bWait = FALSE;
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IMediaSample *pSample;
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LONG lNumberToSend; // Local copy
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NewSegmentPacket* ppacket;
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//
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// Get a batch of samples and send it if possible
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// In any case exit the loop if there is a control action
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// requested
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//
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{
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CAutoLock lck(this);
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while (TRUE) {
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if (m_bTerminate) {
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FreeSamples();
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return 0;
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}
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if (m_bFlushing) {
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FreeSamples();
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SetEvent(m_evFlushComplete);
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}
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// Get a sample off the list
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pSample = m_List->RemoveHead();
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// inform derived class we took something off the queue
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if (m_hEventPop) {
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//DbgLog((LOG_TRACE,3,TEXT("Queue: Delivered SET EVENT")));
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SetEvent(m_hEventPop);
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}
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if (pSample != NULL &&
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!IsSpecialSample(pSample)) {
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// If its just a regular sample just add it to the batch
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// and exit the loop if the batch is full
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m_ppSamples[m_nBatched++] = pSample;
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if (m_nBatched == m_lBatchSize) {
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break;
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}
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} else {
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// If there was nothing in the queue and there's nothing
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// to send (either because there's nothing or the batch
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// isn't full) then prepare to wait
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if (pSample == NULL &&
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(m_bBatchExact || m_nBatched == 0)) {
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// Tell other thread to set the event when there's
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// something do to
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ASSERT(m_lWaiting == 0);
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m_lWaiting++;
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bWait = TRUE;
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} else {
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// We break out of the loop on SEND_PACKET unless
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// there's nothing to send
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if (pSample == SEND_PACKET && m_nBatched == 0) {
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continue;
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}
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if (pSample == NEW_SEGMENT) {
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// now we need the parameters - we are
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// guaranteed that the next packet contains them
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ppacket = (NewSegmentPacket *) m_List->RemoveHead();
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// we took something off the queue
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if (m_hEventPop) {
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//DbgLog((LOG_TRACE,3,TEXT("Queue: Delivered SET EVENT")));
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SetEvent(m_hEventPop);
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}
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ASSERT(ppacket);
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}
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// EOS_PACKET falls through here and we exit the loop
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// In this way it acts like SEND_PACKET
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}
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break;
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}
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}
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if (!bWait) {
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// We look at m_nBatched from the client side so keep
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// it up to date inside the critical section
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lNumberToSend = m_nBatched; // Local copy
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m_nBatched = 0;
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}
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}
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// Wait for some more data
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if (bWait) {
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DbgWaitForSingleObject(m_hSem);
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continue;
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}
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// OK - send it if there's anything to send
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// We DON'T check m_bBatchExact here because either we've got
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// a full batch or we dropped through because we got
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// SEND_PACKET or EOS_PACKET - both of which imply we should
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// flush our batch
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if (lNumberToSend != 0) {
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long nProcessed;
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if (m_hr == S_OK) {
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ASSERT(!m_bFlushed);
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HRESULT hr = m_pInputPin->ReceiveMultiple(m_ppSamples,
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lNumberToSend,
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&nProcessed);
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/* Don't overwrite a flushing state HRESULT */
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CAutoLock lck(this);
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if (m_hr == S_OK) {
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m_hr = hr;
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}
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ASSERT(!m_bFlushed);
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}
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while (lNumberToSend != 0) {
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m_ppSamples[--lNumberToSend]->Release();
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}
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if (m_hr != S_OK) {
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// In any case wait for more data - S_OK just
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// means there wasn't an error
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DbgLog((LOG_ERROR, 2, TEXT("ReceiveMultiple returned %8.8X"),
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m_hr));
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}
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}
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// Check for end of stream
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if (pSample == EOS_PACKET) {
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// We don't send even end of stream on if we've previously
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// returned something other than S_OK
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// This is because in that case the pin which returned
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// something other than S_OK should have either sent
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// EndOfStream() or notified the filter graph
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if (m_hr == S_OK) {
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DbgLog((LOG_TRACE, 2, TEXT("COutputQueue sending EndOfStream()")));
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HRESULT hr = m_pPin->EndOfStream();
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if (FAILED(hr)) {
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DbgLog((LOG_ERROR, 2, TEXT("COutputQueue got code 0x%8.8X from EndOfStream()")));
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}
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}
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}
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// Data from a new source
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if (pSample == RESET_PACKET) {
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m_hr = S_OK;
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SetEvent(m_evFlushComplete);
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}
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if (pSample == NEW_SEGMENT) {
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m_pPin->NewSegment(ppacket->tStart, ppacket->tStop, ppacket->dRate);
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delete ppacket;
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}
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}
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}
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// Send batched stuff anyway
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void COutputQueue::SendAnyway()
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{
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if (!IsQueued()) {
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// m_bSendAnyway is a private parameter checked in ReceiveMultiple
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m_bSendAnyway = TRUE;
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LONG nProcessed;
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ReceiveMultiple(NULL, 0, &nProcessed);
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m_bSendAnyway = FALSE;
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} else {
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CAutoLock lck(this);
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QueueSample(SEND_PACKET);
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NotifyThread();
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}
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}
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void
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COutputQueue::NewSegment(
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REFERENCE_TIME tStart,
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REFERENCE_TIME tStop,
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double dRate)
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{
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if (!IsQueued()) {
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if (S_OK == m_hr) {
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if (m_bBatchExact) {
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SendAnyway();
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}
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m_pPin->NewSegment(tStart, tStop, dRate);
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}
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} else {
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if (m_hr == S_OK) {
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//
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// we need to queue the new segment to appear in order in the
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// data, but we need to pass parameters to it. Rather than
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// take the hit of wrapping every single sample so we can tell
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// special ones apart, we queue special pointers to indicate
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// special packets, and we guarantee (by holding the
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// critical section) that the packet immediately following a
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// NEW_SEGMENT value is a NewSegmentPacket containing the
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// parameters.
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NewSegmentPacket * ppack = new NewSegmentPacket;
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if (ppack == NULL) {
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return;
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}
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ppack->tStart = tStart;
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ppack->tStop = tStop;
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ppack->dRate = dRate;
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CAutoLock lck(this);
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QueueSample(NEW_SEGMENT);
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QueueSample( (IMediaSample*) ppack);
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NotifyThread();
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}
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}
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}
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//
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// End of Stream is queued to output device
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//
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void COutputQueue::EOS()
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{
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CAutoLock lck(this);
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if (!IsQueued()) {
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if (m_bBatchExact) {
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SendAnyway();
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}
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if (m_hr == S_OK) {
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DbgLog((LOG_TRACE, 2, TEXT("COutputQueue sending EndOfStream()")));
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m_bFlushed = FALSE;
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HRESULT hr = m_pPin->EndOfStream();
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if (FAILED(hr)) {
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DbgLog((LOG_ERROR, 2, TEXT("COutputQueue got code 0x%8.8X from EndOfStream()")));
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}
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}
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} else {
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if (m_hr == S_OK) {
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m_bFlushed = FALSE;
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QueueSample(EOS_PACKET);
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NotifyThread();
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}
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}
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}
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//
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// Flush all the samples in the queue
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//
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void COutputQueue::BeginFlush()
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{
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if (IsQueued()) {
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{
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CAutoLock lck(this);
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// block receives -- we assume this is done by the
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// filter in which we are a component
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// discard all queued data
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m_bFlushing = TRUE;
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// Make sure we discard all samples from now on
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if (m_hr == S_OK) {
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m_hr = S_FALSE;
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}
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// Optimize so we don't keep calling downstream all the time
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if (m_bFlushed && m_bFlushingOpt) {
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return;
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}
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// Make sure we really wait for the flush to complete
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m_evFlushComplete.Reset();
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NotifyThread();
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}
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// pass this downstream
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m_pPin->BeginFlush();
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} else {
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// pass downstream first to avoid deadlocks
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m_pPin->BeginFlush();
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CAutoLock lck(this);
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// discard all queued data
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m_bFlushing = TRUE;
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// Make sure we discard all samples from now on
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if (m_hr == S_OK) {
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m_hr = S_FALSE;
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}
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}
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}
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//
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// leave flush mode - pass this downstream
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void COutputQueue::EndFlush()
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{
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{
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CAutoLock lck(this);
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ASSERT(m_bFlushing);
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if (m_bFlushingOpt && m_bFlushed && IsQueued()) {
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m_bFlushing = FALSE;
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m_hr = S_OK;
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return;
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}
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}
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// sync with pushing thread -- done in BeginFlush
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// ensure no more data to go downstream -- done in BeginFlush
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//
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// Because we are synching here there is no need to hold the critical
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// section (in fact we'd deadlock if we did!)
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if (IsQueued()) {
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m_evFlushComplete.Wait();
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} else {
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FreeSamples();
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}
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// Be daring - the caller has guaranteed no samples will arrive
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// before EndFlush() returns
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m_bFlushing = FALSE;
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m_bFlushed = TRUE;
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// call EndFlush on downstream pins
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m_pPin->EndFlush();
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m_hr = S_OK;
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}
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// COutputQueue::QueueSample
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//
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// private method to Send a sample to the output queue
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// The critical section MUST be held when this is called
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void COutputQueue::QueueSample(IMediaSample *pSample)
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{
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if (NULL == m_List->AddTail(pSample)) {
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if (!IsSpecialSample(pSample)) {
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pSample->Release();
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}
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}
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}
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//
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// COutputQueue::Receive()
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//
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// Send a single sample by the multiple sample route
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// (NOTE - this could be optimized if necessary)
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//
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// On return the sample will have been Release()'d
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//
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HRESULT COutputQueue::Receive(IMediaSample *pSample)
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{
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LONG nProcessed;
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return ReceiveMultiple(&pSample, 1, &nProcessed);
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}
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//
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// COutputQueue::ReceiveMultiple()
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//
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// Send a set of samples to the downstream pin
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//
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// ppSamples - array of samples
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// nSamples - how many
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// nSamplesProcessed - How many were processed
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//
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// On return all samples will have been Release()'d
|
|
//
|
|
|
|
HRESULT COutputQueue::ReceiveMultiple (
|
|
IMediaSample **ppSamples,
|
|
long nSamples,
|
|
long *nSamplesProcessed)
|
|
{
|
|
CAutoLock lck(this);
|
|
// Either call directly or queue up the samples
|
|
|
|
if (!IsQueued()) {
|
|
|
|
// If we already had a bad return code then just return
|
|
|
|
if (S_OK != m_hr) {
|
|
|
|
// If we've never received anything since the last Flush()
|
|
// and the sticky return code is not S_OK we must be
|
|
// flushing
|
|
// ((!A || B) is equivalent to A implies B)
|
|
ASSERT(!m_bFlushed || m_bFlushing);
|
|
|
|
// We're supposed to Release() them anyway!
|
|
*nSamplesProcessed = 0;
|
|
for (int i = 0; i < nSamples; i++) {
|
|
DbgLog((LOG_TRACE, 3, TEXT("COutputQueue (direct) : Discarding %d samples code 0x%8.8X"),
|
|
nSamples, m_hr));
|
|
ppSamples[i]->Release();
|
|
}
|
|
|
|
return m_hr;
|
|
}
|
|
//
|
|
// If we're flushing the sticky return code should be S_FALSE
|
|
//
|
|
ASSERT(!m_bFlushing);
|
|
m_bFlushed = FALSE;
|
|
|
|
ASSERT(m_nBatched < m_lBatchSize);
|
|
ASSERT(m_nBatched == 0 || m_bBatchExact);
|
|
|
|
// Loop processing the samples in batches
|
|
|
|
LONG iLost = 0;
|
|
for (long iDone = 0;
|
|
iDone < nSamples || (m_nBatched != 0 && m_bSendAnyway);
|
|
) {
|
|
|
|
//pragma message (REMIND("Implement threshold scheme"))
|
|
ASSERT(m_nBatched < m_lBatchSize);
|
|
if (iDone < nSamples) {
|
|
m_ppSamples[m_nBatched++] = ppSamples[iDone++];
|
|
}
|
|
if (m_nBatched == m_lBatchSize ||
|
|
nSamples == 0 && (m_bSendAnyway || !m_bBatchExact)) {
|
|
LONG nDone;
|
|
DbgLog((LOG_TRACE, 4, TEXT("Batching %d samples"),
|
|
m_nBatched));
|
|
|
|
if (m_hr == S_OK) {
|
|
m_hr = m_pInputPin->ReceiveMultiple(m_ppSamples,
|
|
m_nBatched,
|
|
&nDone);
|
|
} else {
|
|
nDone = 0;
|
|
}
|
|
iLost += m_nBatched - nDone;
|
|
for (LONG i = 0; i < m_nBatched; i++) {
|
|
m_ppSamples[i]->Release();
|
|
}
|
|
m_nBatched = 0;
|
|
}
|
|
}
|
|
*nSamplesProcessed = iDone - iLost;
|
|
if (*nSamplesProcessed < 0) {
|
|
*nSamplesProcessed = 0;
|
|
}
|
|
return m_hr;
|
|
} else {
|
|
/* We're sending to our thread */
|
|
|
|
if (m_hr != S_OK) {
|
|
*nSamplesProcessed = 0;
|
|
DbgLog((LOG_TRACE, 3, TEXT("COutputQueue (queued) : Discarding %d samples code 0x%8.8X"),
|
|
nSamples, m_hr));
|
|
for (int i = 0; i < nSamples; i++) {
|
|
ppSamples[i]->Release();
|
|
}
|
|
return m_hr;
|
|
}
|
|
m_bFlushed = FALSE;
|
|
for (long i = 0; i < nSamples; i++) {
|
|
QueueSample(ppSamples[i]);
|
|
}
|
|
*nSamplesProcessed = nSamples;
|
|
if (!m_bBatchExact ||
|
|
m_nBatched + m_List->GetCount() >= m_lBatchSize) {
|
|
NotifyThread();
|
|
}
|
|
return S_OK;
|
|
}
|
|
}
|
|
|
|
// Get ready for new data - cancels sticky m_hr
|
|
void COutputQueue::Reset()
|
|
{
|
|
if (!IsQueued()) {
|
|
m_hr = S_OK;
|
|
} else {
|
|
CAutoLock lck(this);
|
|
QueueSample(RESET_PACKET);
|
|
NotifyThread();
|
|
m_evFlushComplete.Wait();
|
|
}
|
|
}
|
|
|
|
// Remove and Release() all queued and Batched samples
|
|
void COutputQueue::FreeSamples()
|
|
{
|
|
CAutoLock lck(this);
|
|
if (IsQueued()) {
|
|
while (TRUE) {
|
|
IMediaSample *pSample = m_List->RemoveHead();
|
|
// inform derived class we took something off the queue
|
|
if (m_hEventPop) {
|
|
//DbgLog((LOG_TRACE,3,TEXT("Queue: Delivered SET EVENT")));
|
|
SetEvent(m_hEventPop);
|
|
}
|
|
|
|
if (pSample == NULL) {
|
|
break;
|
|
}
|
|
if (!IsSpecialSample(pSample)) {
|
|
pSample->Release();
|
|
} else {
|
|
if (pSample == NEW_SEGMENT) {
|
|
// Free NEW_SEGMENT packet
|
|
NewSegmentPacket *ppacket =
|
|
(NewSegmentPacket *) m_List->RemoveHead();
|
|
// inform derived class we took something off the queue
|
|
if (m_hEventPop) {
|
|
//DbgLog((LOG_TRACE,3,TEXT("Queue: Delivered SET EVENT")));
|
|
SetEvent(m_hEventPop);
|
|
}
|
|
|
|
ASSERT(ppacket != NULL);
|
|
delete ppacket;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
for (int i = 0; i < m_nBatched; i++) {
|
|
m_ppSamples[i]->Release();
|
|
}
|
|
m_nBatched = 0;
|
|
}
|
|
|
|
// Notify the thread if there is something to do
|
|
//
|
|
// The critical section MUST be held when this is called
|
|
void COutputQueue::NotifyThread()
|
|
{
|
|
// Optimize - no need to signal if it's not waiting
|
|
ASSERT(IsQueued());
|
|
if (m_lWaiting) {
|
|
ReleaseSemaphore(m_hSem, m_lWaiting, NULL);
|
|
m_lWaiting = 0;
|
|
}
|
|
}
|
|
|
|
// See if there's any work to do
|
|
// Returns
|
|
// TRUE if there is nothing on the queue and nothing in the batch
|
|
// and all data has been sent
|
|
// FALSE otherwise
|
|
//
|
|
BOOL COutputQueue::IsIdle()
|
|
{
|
|
CAutoLock lck(this);
|
|
|
|
// We're idle if
|
|
// there is no thread (!IsQueued()) OR
|
|
// the thread is waiting for more work (m_lWaiting != 0)
|
|
// AND
|
|
// there's nothing in the current batch (m_nBatched == 0)
|
|
|
|
if (IsQueued() && m_lWaiting == 0 || m_nBatched != 0) {
|
|
return FALSE;
|
|
} else {
|
|
|
|
// If we're idle it shouldn't be possible for there
|
|
// to be anything on the work queue
|
|
|
|
ASSERT(!IsQueued() || m_List->GetCount() == 0);
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
|
|
void COutputQueue::SetPopEvent(HANDLE hEvent)
|
|
{
|
|
m_hEventPop = hEvent;
|
|
}
|