528 lines
12 KiB
C++
528 lines
12 KiB
C++
//------------------------------------------------------------------------------
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// File: Source.cpp
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//
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// Desc: DirectShow base classes - implements CSource, which is a Quartz
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// source filter 'template.'
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//
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//@@BEGIN_MSINTERNAL
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//
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// March 1995
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//
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//@@END_MSINTERNAL
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// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------------------------
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// Locking Strategy.
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//
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// Hold the filter critical section (m_pFilter->pStateLock()) to serialise
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// access to functions. Note that, in general, this lock may be held
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// by a function when the worker thread may want to hold it. Therefore
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// if you wish to access shared state from the worker thread you will
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// need to add another critical section object. The execption is during
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// the threads processing loop, when it is safe to get the filter critical
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// section from within FillBuffer().
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#include <streams.h>
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//
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// CSource::Constructor
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//
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// Initialise the pin count for the filter. The user will create the pins in
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// the derived class.
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CSource::CSource(TCHAR *pName, LPUNKNOWN lpunk, CLSID clsid)
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: CBaseFilter(pName, lpunk, &m_cStateLock, clsid),
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m_iPins(0),
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m_paStreams(NULL)
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{
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}
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CSource::CSource(TCHAR *pName, LPUNKNOWN lpunk, CLSID clsid, HRESULT *phr)
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: CBaseFilter(pName, lpunk, &m_cStateLock, clsid),
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m_iPins(0),
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m_paStreams(NULL)
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{
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UNREFERENCED_PARAMETER(phr);
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}
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#ifdef UNICODE
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CSource::CSource(CHAR *pName, LPUNKNOWN lpunk, CLSID clsid)
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: CBaseFilter(pName, lpunk, &m_cStateLock, clsid),
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m_iPins(0),
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m_paStreams(NULL)
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{
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}
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CSource::CSource(CHAR *pName, LPUNKNOWN lpunk, CLSID clsid, HRESULT *phr)
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: CBaseFilter(pName, lpunk, &m_cStateLock, clsid),
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m_iPins(0),
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m_paStreams(NULL)
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{
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UNREFERENCED_PARAMETER(phr);
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}
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#endif
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//
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// CSource::Destructor
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//
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CSource::~CSource()
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{
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/* Free our pins and pin array */
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while (m_iPins != 0) {
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// deleting the pins causes them to be removed from the array...
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delete m_paStreams[m_iPins - 1];
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}
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ASSERT(m_paStreams == NULL);
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}
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//
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// Add a new pin
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//
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HRESULT CSource::AddPin(CSourceStream *pStream)
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{
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CAutoLock lock(&m_cStateLock);
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/* Allocate space for this pin and the old ones */
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CSourceStream **paStreams = new CSourceStream *[m_iPins + 1];
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if (paStreams == NULL) {
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return E_OUTOFMEMORY;
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}
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if (m_paStreams != NULL) {
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CopyMemory((PVOID)paStreams, (PVOID)m_paStreams,
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m_iPins * sizeof(m_paStreams[0]));
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paStreams[m_iPins] = pStream;
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delete [] m_paStreams;
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}
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m_paStreams = paStreams;
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m_paStreams[m_iPins] = pStream;
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m_iPins++;
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return S_OK;
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}
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//
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// Remove a pin - pStream is NOT deleted
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//
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HRESULT CSource::RemovePin(CSourceStream *pStream)
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{
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int i;
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for (i = 0; i < m_iPins; i++) {
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if (m_paStreams[i] == pStream) {
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if (m_iPins == 1) {
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delete [] m_paStreams;
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m_paStreams = NULL;
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} else {
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/* no need to reallocate */
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while (++i < m_iPins)
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m_paStreams[i - 1] = m_paStreams[i];
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}
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m_iPins--;
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return S_OK;
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}
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}
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return S_FALSE;
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}
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//
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// FindPin
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//
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// Set *ppPin to the IPin* that has the id Id.
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// or to NULL if the Id cannot be matched.
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STDMETHODIMP CSource::FindPin(LPCWSTR Id, IPin **ppPin)
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{
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CheckPointer(ppPin,E_POINTER);
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ValidateReadWritePtr(ppPin,sizeof(IPin *));
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// The -1 undoes the +1 in QueryId and ensures that totally invalid
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// strings (for which WstrToInt delivers 0) give a deliver a NULL pin.
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int i = WstrToInt(Id) -1;
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*ppPin = GetPin(i);
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if (*ppPin!=NULL){
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(*ppPin)->AddRef();
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return NOERROR;
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} else {
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return VFW_E_NOT_FOUND;
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}
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}
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//
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// FindPinNumber
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//
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// return the number of the pin with this IPin* or -1 if none
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int CSource::FindPinNumber(IPin *iPin) {
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int i;
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for (i=0; i<m_iPins; ++i) {
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if ((IPin *)(m_paStreams[i])==iPin) {
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return i;
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}
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}
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return -1;
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}
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//
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// GetPinCount
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//
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// Returns the number of pins this filter has
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int CSource::GetPinCount(void) {
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CAutoLock lock(&m_cStateLock);
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return m_iPins;
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}
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//
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// GetPin
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//
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// Return a non-addref'd pointer to pin n
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// needed by CBaseFilter
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CBasePin *CSource::GetPin(int n) {
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CAutoLock lock(&m_cStateLock);
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// n must be in the range 0..m_iPins-1
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// if m_iPins>n && n>=0 it follows that m_iPins>0
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// which is what used to be checked (i.e. checking that we have a pin)
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if ((n >= 0) && (n < m_iPins)) {
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ASSERT(m_paStreams[n]);
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return m_paStreams[n];
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}
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return NULL;
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}
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//
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// *
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// * --- CSourceStream ----
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// *
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//
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// Set Id to point to a CoTaskMemAlloc'd
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STDMETHODIMP CSourceStream::QueryId(LPWSTR *Id) {
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CheckPointer(Id,E_POINTER);
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ValidateReadWritePtr(Id,sizeof(LPWSTR));
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// We give the pins id's which are 1,2,...
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// FindPinNumber returns -1 for an invalid pin
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int i = 1+ m_pFilter->FindPinNumber(this);
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if (i<1) return VFW_E_NOT_FOUND;
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*Id = (LPWSTR)CoTaskMemAlloc(8);
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if (*Id==NULL) {
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return E_OUTOFMEMORY;
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}
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IntToWstr(i, *Id);
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return NOERROR;
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}
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//
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// CSourceStream::Constructor
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//
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// increments the number of pins present on the filter
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CSourceStream::CSourceStream(
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TCHAR *pObjectName,
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HRESULT *phr,
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CSource *ps,
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LPCWSTR pPinName)
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: CBaseOutputPin(pObjectName, ps, ps->pStateLock(), phr, pPinName),
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m_pFilter(ps) {
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*phr = m_pFilter->AddPin(this);
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}
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#ifdef UNICODE
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CSourceStream::CSourceStream(
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char *pObjectName,
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HRESULT *phr,
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CSource *ps,
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LPCWSTR pPinName)
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: CBaseOutputPin(pObjectName, ps, ps->pStateLock(), phr, pPinName),
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m_pFilter(ps) {
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*phr = m_pFilter->AddPin(this);
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}
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#endif
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//
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// CSourceStream::Destructor
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//
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// Decrements the number of pins on this filter
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CSourceStream::~CSourceStream(void) {
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m_pFilter->RemovePin(this);
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}
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//
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// CheckMediaType
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//
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// Do we support this type? Provides the default support for 1 type.
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HRESULT CSourceStream::CheckMediaType(const CMediaType *pMediaType) {
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CAutoLock lock(m_pFilter->pStateLock());
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CMediaType mt;
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GetMediaType(&mt);
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if (mt == *pMediaType) {
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return NOERROR;
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}
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return E_FAIL;
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}
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//
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// GetMediaType/3
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//
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// By default we support only one type
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// iPosition indexes are 0-n
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HRESULT CSourceStream::GetMediaType(int iPosition, CMediaType *pMediaType) {
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CAutoLock lock(m_pFilter->pStateLock());
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if (iPosition<0) {
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return E_INVALIDARG;
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}
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if (iPosition>0) {
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return VFW_S_NO_MORE_ITEMS;
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}
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return GetMediaType(pMediaType);
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}
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//
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// Active
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//
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// The pin is active - start up the worker thread
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HRESULT CSourceStream::Active(void) {
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CAutoLock lock(m_pFilter->pStateLock());
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HRESULT hr;
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if (m_pFilter->IsActive()) {
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return S_FALSE; // succeeded, but did not allocate resources (they already exist...)
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}
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// do nothing if not connected - its ok not to connect to
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// all pins of a source filter
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if (!IsConnected()) {
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return NOERROR;
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}
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hr = CBaseOutputPin::Active();
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if (FAILED(hr)) {
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return hr;
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}
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ASSERT(!ThreadExists());
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// start the thread
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if (!Create()) {
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return E_FAIL;
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}
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// Tell thread to initialize. If OnThreadCreate Fails, so does this.
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hr = Init();
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if (FAILED(hr))
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return hr;
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return Pause();
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}
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//
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// Inactive
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//
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// Pin is inactive - shut down the worker thread
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// Waits for the worker to exit before returning.
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HRESULT CSourceStream::Inactive(void) {
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CAutoLock lock(m_pFilter->pStateLock());
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HRESULT hr;
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// do nothing if not connected - its ok not to connect to
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// all pins of a source filter
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if (!IsConnected()) {
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return NOERROR;
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}
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// !!! need to do this before trying to stop the thread, because
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// we may be stuck waiting for our own allocator!!!
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hr = CBaseOutputPin::Inactive(); // call this first to Decommit the allocator
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if (FAILED(hr)) {
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return hr;
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}
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if (ThreadExists()) {
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hr = Stop();
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if (FAILED(hr)) {
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return hr;
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}
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hr = Exit();
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if (FAILED(hr)) {
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return hr;
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}
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Close(); // Wait for the thread to exit, then tidy up.
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}
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// hr = CBaseOutputPin::Inactive(); // call this first to Decommit the allocator
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//if (FAILED(hr)) {
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// return hr;
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//}
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return NOERROR;
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}
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//
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// ThreadProc
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//
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// When this returns the thread exits
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// Return codes > 0 indicate an error occured
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DWORD CSourceStream::ThreadProc(void) {
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HRESULT hr; // the return code from calls
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Command com;
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do {
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com = GetRequest();
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if (com != CMD_INIT) {
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DbgLog((LOG_ERROR, 1, TEXT("Thread expected init command")));
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Reply((DWORD) E_UNEXPECTED);
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}
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} while (com != CMD_INIT);
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DbgLog((LOG_TRACE, 1, TEXT("CSourceStream worker thread initializing")));
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hr = OnThreadCreate(); // perform set up tasks
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if (FAILED(hr)) {
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DbgLog((LOG_ERROR, 1, TEXT("CSourceStream::OnThreadCreate failed. Aborting thread.")));
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OnThreadDestroy();
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Reply(hr); // send failed return code from OnThreadCreate
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return 1;
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}
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// Initialisation suceeded
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Reply(NOERROR);
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Command cmd;
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do {
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cmd = GetRequest();
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switch (cmd) {
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case CMD_EXIT:
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Reply(NOERROR);
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break;
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case CMD_RUN:
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DbgLog((LOG_ERROR, 1, TEXT("CMD_RUN received before a CMD_PAUSE???")));
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// !!! fall through???
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case CMD_PAUSE:
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Reply(NOERROR);
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DoBufferProcessingLoop();
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break;
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case CMD_STOP:
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Reply(NOERROR);
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break;
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default:
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DbgLog((LOG_ERROR, 1, TEXT("Unknown command %d received!"), cmd));
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Reply((DWORD) E_NOTIMPL);
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break;
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}
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} while (cmd != CMD_EXIT);
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hr = OnThreadDestroy(); // tidy up.
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if (FAILED(hr)) {
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DbgLog((LOG_ERROR, 1, TEXT("CSourceStream::OnThreadDestroy failed. Exiting thread.")));
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return 1;
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}
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DbgLog((LOG_TRACE, 1, TEXT("CSourceStream worker thread exiting")));
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return 0;
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}
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//
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// DoBufferProcessingLoop
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//
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// Grabs a buffer and calls the users processing function.
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// Overridable, so that different delivery styles can be catered for.
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HRESULT CSourceStream::DoBufferProcessingLoop(void) {
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Command com;
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OnThreadStartPlay();
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do {
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while (!CheckRequest(&com)) {
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IMediaSample *pSample;
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HRESULT hr = GetDeliveryBuffer(&pSample,NULL,NULL,0);
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if (FAILED(hr)) {
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Sleep(1);
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continue; // go round again. Perhaps the error will go away
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// or the allocator is decommited & we will be asked to
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// exit soon.
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}
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// Virtual function user will override.
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hr = FillBuffer(pSample);
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if (hr == S_OK) {
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hr = Deliver(pSample);
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pSample->Release();
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// downstream filter returns S_FALSE if it wants us to
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// stop or an error if it's reporting an error.
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if(hr != S_OK)
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{
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DbgLog((LOG_TRACE, 2, TEXT("Deliver() returned %08x; stopping"), hr));
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return S_OK;
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}
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} else if (hr == S_FALSE) {
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// derived class wants us to stop pushing data
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pSample->Release();
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DeliverEndOfStream();
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return S_OK;
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} else {
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// derived class encountered an error
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pSample->Release();
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DbgLog((LOG_ERROR, 1, TEXT("Error %08lX from FillBuffer!!!"), hr));
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DeliverEndOfStream();
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m_pFilter->NotifyEvent(EC_ERRORABORT, hr, 0);
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return hr;
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}
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// all paths release the sample
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}
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// For all commands sent to us there must be a Reply call!
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if (com == CMD_RUN || com == CMD_PAUSE) {
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Reply(NOERROR);
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} else if (com != CMD_STOP) {
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Reply((DWORD) E_UNEXPECTED);
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DbgLog((LOG_ERROR, 1, TEXT("Unexpected command!!!")));
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}
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} while (com != CMD_STOP);
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return S_FALSE;
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}
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