mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-17 22:06:41 +00:00
42bdeaf52c
Original repo is here: https://github.com/microsoft/Windows-classic-samples Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1577>
522 lines
12 KiB
C++
522 lines
12 KiB
C++
//------------------------------------------------------------------------------
|
|
// File: Source.cpp
|
|
//
|
|
// Desc: DirectShow base classes - implements CSource, which is a Quartz
|
|
// source filter 'template.'
|
|
//
|
|
// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
|
|
//------------------------------------------------------------------------------
|
|
|
|
|
|
// Locking Strategy.
|
|
//
|
|
// Hold the filter critical section (m_pFilter->pStateLock()) to serialise
|
|
// access to functions. Note that, in general, this lock may be held
|
|
// by a function when the worker thread may want to hold it. Therefore
|
|
// if you wish to access shared state from the worker thread you will
|
|
// need to add another critical section object. The execption is during
|
|
// the threads processing loop, when it is safe to get the filter critical
|
|
// section from within FillBuffer().
|
|
|
|
#include <streams.h>
|
|
|
|
|
|
//
|
|
// CSource::Constructor
|
|
//
|
|
// Initialise the pin count for the filter. The user will create the pins in
|
|
// the derived class.
|
|
CSource::CSource(__in_opt LPCTSTR pName, __inout_opt LPUNKNOWN lpunk, CLSID clsid)
|
|
: CBaseFilter(pName, lpunk, &m_cStateLock, clsid),
|
|
m_iPins(0),
|
|
m_paStreams(NULL)
|
|
{
|
|
}
|
|
|
|
CSource::CSource(__in_opt LPCTSTR pName, __inout_opt LPUNKNOWN lpunk, CLSID clsid, __inout HRESULT *phr)
|
|
: CBaseFilter(pName, lpunk, &m_cStateLock, clsid),
|
|
m_iPins(0),
|
|
m_paStreams(NULL)
|
|
{
|
|
UNREFERENCED_PARAMETER(phr);
|
|
}
|
|
|
|
#ifdef UNICODE
|
|
CSource::CSource(__in_opt LPCSTR pName, __inout_opt LPUNKNOWN lpunk, CLSID clsid)
|
|
: CBaseFilter(pName, lpunk, &m_cStateLock, clsid),
|
|
m_iPins(0),
|
|
m_paStreams(NULL)
|
|
{
|
|
}
|
|
|
|
CSource::CSource(__in_opt LPCSTR pName, __inout_opt LPUNKNOWN lpunk, CLSID clsid, __inout HRESULT *phr)
|
|
: CBaseFilter(pName, lpunk, &m_cStateLock, clsid),
|
|
m_iPins(0),
|
|
m_paStreams(NULL)
|
|
{
|
|
UNREFERENCED_PARAMETER(phr);
|
|
}
|
|
#endif
|
|
|
|
//
|
|
// CSource::Destructor
|
|
//
|
|
CSource::~CSource()
|
|
{
|
|
/* Free our pins and pin array */
|
|
while (m_iPins != 0) {
|
|
// deleting the pins causes them to be removed from the array...
|
|
delete m_paStreams[m_iPins - 1];
|
|
}
|
|
|
|
ASSERT(m_paStreams == NULL);
|
|
}
|
|
|
|
|
|
//
|
|
// Add a new pin
|
|
//
|
|
HRESULT CSource::AddPin(__in CSourceStream *pStream)
|
|
{
|
|
CAutoLock lock(&m_cStateLock);
|
|
|
|
/* Allocate space for this pin and the old ones */
|
|
CSourceStream **paStreams = new CSourceStream *[m_iPins + 1];
|
|
if (paStreams == NULL) {
|
|
return E_OUTOFMEMORY;
|
|
}
|
|
if (m_paStreams != NULL) {
|
|
CopyMemory((PVOID)paStreams, (PVOID)m_paStreams,
|
|
m_iPins * sizeof(m_paStreams[0]));
|
|
paStreams[m_iPins] = pStream;
|
|
delete [] m_paStreams;
|
|
}
|
|
m_paStreams = paStreams;
|
|
m_paStreams[m_iPins] = pStream;
|
|
m_iPins++;
|
|
return S_OK;
|
|
}
|
|
|
|
//
|
|
// Remove a pin - pStream is NOT deleted
|
|
//
|
|
HRESULT CSource::RemovePin(__in CSourceStream *pStream)
|
|
{
|
|
int i;
|
|
for (i = 0; i < m_iPins; i++) {
|
|
if (m_paStreams[i] == pStream) {
|
|
if (m_iPins == 1) {
|
|
delete [] m_paStreams;
|
|
m_paStreams = NULL;
|
|
} else {
|
|
/* no need to reallocate */
|
|
while (++i < m_iPins)
|
|
m_paStreams[i - 1] = m_paStreams[i];
|
|
}
|
|
m_iPins--;
|
|
return S_OK;
|
|
}
|
|
}
|
|
return S_FALSE;
|
|
}
|
|
|
|
//
|
|
// FindPin
|
|
//
|
|
// Set *ppPin to the IPin* that has the id Id.
|
|
// or to NULL if the Id cannot be matched.
|
|
STDMETHODIMP CSource::FindPin(LPCWSTR Id, __deref_out IPin **ppPin)
|
|
{
|
|
CheckPointer(ppPin,E_POINTER);
|
|
ValidateReadWritePtr(ppPin,sizeof(IPin *));
|
|
// The -1 undoes the +1 in QueryId and ensures that totally invalid
|
|
// strings (for which WstrToInt delivers 0) give a deliver a NULL pin.
|
|
int i = WstrToInt(Id) -1;
|
|
*ppPin = GetPin(i);
|
|
if (*ppPin!=NULL){
|
|
(*ppPin)->AddRef();
|
|
return NOERROR;
|
|
} else {
|
|
return VFW_E_NOT_FOUND;
|
|
}
|
|
}
|
|
|
|
//
|
|
// FindPinNumber
|
|
//
|
|
// return the number of the pin with this IPin* or -1 if none
|
|
int CSource::FindPinNumber(__in IPin *iPin) {
|
|
int i;
|
|
for (i=0; i<m_iPins; ++i) {
|
|
if ((IPin *)(m_paStreams[i])==iPin) {
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
//
|
|
// GetPinCount
|
|
//
|
|
// Returns the number of pins this filter has
|
|
int CSource::GetPinCount(void) {
|
|
|
|
CAutoLock lock(&m_cStateLock);
|
|
return m_iPins;
|
|
}
|
|
|
|
|
|
//
|
|
// GetPin
|
|
//
|
|
// Return a non-addref'd pointer to pin n
|
|
// needed by CBaseFilter
|
|
CBasePin *CSource::GetPin(int n) {
|
|
|
|
CAutoLock lock(&m_cStateLock);
|
|
|
|
// n must be in the range 0..m_iPins-1
|
|
// if m_iPins>n && n>=0 it follows that m_iPins>0
|
|
// which is what used to be checked (i.e. checking that we have a pin)
|
|
if ((n >= 0) && (n < m_iPins)) {
|
|
|
|
ASSERT(m_paStreams[n]);
|
|
return m_paStreams[n];
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
//
|
|
|
|
|
|
// *
|
|
// * --- CSourceStream ----
|
|
// *
|
|
|
|
//
|
|
// Set Id to point to a CoTaskMemAlloc'd
|
|
STDMETHODIMP CSourceStream::QueryId(__deref_out LPWSTR *Id) {
|
|
CheckPointer(Id,E_POINTER);
|
|
ValidateReadWritePtr(Id,sizeof(LPWSTR));
|
|
|
|
// We give the pins id's which are 1,2,...
|
|
// FindPinNumber returns -1 for an invalid pin
|
|
int i = 1+ m_pFilter->FindPinNumber(this);
|
|
if (i<1) return VFW_E_NOT_FOUND;
|
|
*Id = (LPWSTR)CoTaskMemAlloc(sizeof(WCHAR) * 12);
|
|
if (*Id==NULL) {
|
|
return E_OUTOFMEMORY;
|
|
}
|
|
IntToWstr(i, *Id);
|
|
return NOERROR;
|
|
}
|
|
|
|
|
|
|
|
//
|
|
// CSourceStream::Constructor
|
|
//
|
|
// increments the number of pins present on the filter
|
|
CSourceStream::CSourceStream(
|
|
__in_opt LPCTSTR pObjectName,
|
|
__inout HRESULT *phr,
|
|
__inout CSource *ps,
|
|
__in_opt LPCWSTR pPinName)
|
|
: CBaseOutputPin(pObjectName, ps, ps->pStateLock(), phr, pPinName),
|
|
m_pFilter(ps) {
|
|
|
|
*phr = m_pFilter->AddPin(this);
|
|
}
|
|
|
|
#ifdef UNICODE
|
|
CSourceStream::CSourceStream(
|
|
__in_opt LPCSTR pObjectName,
|
|
__inout HRESULT *phr,
|
|
__inout CSource *ps,
|
|
__in_opt LPCWSTR pPinName)
|
|
: CBaseOutputPin(pObjectName, ps, ps->pStateLock(), phr, pPinName),
|
|
m_pFilter(ps) {
|
|
|
|
*phr = m_pFilter->AddPin(this);
|
|
}
|
|
#endif
|
|
//
|
|
// CSourceStream::Destructor
|
|
//
|
|
// Decrements the number of pins on this filter
|
|
CSourceStream::~CSourceStream(void) {
|
|
|
|
m_pFilter->RemovePin(this);
|
|
}
|
|
|
|
|
|
//
|
|
// CheckMediaType
|
|
//
|
|
// Do we support this type? Provides the default support for 1 type.
|
|
HRESULT CSourceStream::CheckMediaType(const CMediaType *pMediaType) {
|
|
|
|
CAutoLock lock(m_pFilter->pStateLock());
|
|
|
|
CMediaType mt;
|
|
GetMediaType(&mt);
|
|
|
|
if (mt == *pMediaType) {
|
|
return NOERROR;
|
|
}
|
|
|
|
return E_FAIL;
|
|
}
|
|
|
|
|
|
//
|
|
// GetMediaType/3
|
|
//
|
|
// By default we support only one type
|
|
// iPosition indexes are 0-n
|
|
HRESULT CSourceStream::GetMediaType(int iPosition, __inout CMediaType *pMediaType) {
|
|
|
|
CAutoLock lock(m_pFilter->pStateLock());
|
|
|
|
if (iPosition<0) {
|
|
return E_INVALIDARG;
|
|
}
|
|
if (iPosition>0) {
|
|
return VFW_S_NO_MORE_ITEMS;
|
|
}
|
|
return GetMediaType(pMediaType);
|
|
}
|
|
|
|
|
|
//
|
|
// Active
|
|
//
|
|
// The pin is active - start up the worker thread
|
|
HRESULT CSourceStream::Active(void) {
|
|
|
|
CAutoLock lock(m_pFilter->pStateLock());
|
|
|
|
HRESULT hr;
|
|
|
|
if (m_pFilter->IsActive()) {
|
|
return S_FALSE; // succeeded, but did not allocate resources (they already exist...)
|
|
}
|
|
|
|
// do nothing if not connected - its ok not to connect to
|
|
// all pins of a source filter
|
|
if (!IsConnected()) {
|
|
return NOERROR;
|
|
}
|
|
|
|
hr = CBaseOutputPin::Active();
|
|
if (FAILED(hr)) {
|
|
return hr;
|
|
}
|
|
|
|
ASSERT(!ThreadExists());
|
|
|
|
// start the thread
|
|
if (!Create()) {
|
|
return E_FAIL;
|
|
}
|
|
|
|
// Tell thread to initialize. If OnThreadCreate Fails, so does this.
|
|
hr = Init();
|
|
if (FAILED(hr))
|
|
return hr;
|
|
|
|
return Pause();
|
|
}
|
|
|
|
|
|
//
|
|
// Inactive
|
|
//
|
|
// Pin is inactive - shut down the worker thread
|
|
// Waits for the worker to exit before returning.
|
|
HRESULT CSourceStream::Inactive(void) {
|
|
|
|
CAutoLock lock(m_pFilter->pStateLock());
|
|
|
|
HRESULT hr;
|
|
|
|
// do nothing if not connected - its ok not to connect to
|
|
// all pins of a source filter
|
|
if (!IsConnected()) {
|
|
return NOERROR;
|
|
}
|
|
|
|
// !!! need to do this before trying to stop the thread, because
|
|
// we may be stuck waiting for our own allocator!!!
|
|
|
|
hr = CBaseOutputPin::Inactive(); // call this first to Decommit the allocator
|
|
if (FAILED(hr)) {
|
|
return hr;
|
|
}
|
|
|
|
if (ThreadExists()) {
|
|
hr = Stop();
|
|
|
|
if (FAILED(hr)) {
|
|
return hr;
|
|
}
|
|
|
|
hr = Exit();
|
|
if (FAILED(hr)) {
|
|
return hr;
|
|
}
|
|
|
|
Close(); // Wait for the thread to exit, then tidy up.
|
|
}
|
|
|
|
// hr = CBaseOutputPin::Inactive(); // call this first to Decommit the allocator
|
|
//if (FAILED(hr)) {
|
|
// return hr;
|
|
//}
|
|
|
|
return NOERROR;
|
|
}
|
|
|
|
|
|
//
|
|
// ThreadProc
|
|
//
|
|
// When this returns the thread exits
|
|
// Return codes > 0 indicate an error occured
|
|
DWORD CSourceStream::ThreadProc(void) {
|
|
|
|
HRESULT hr; // the return code from calls
|
|
Command com;
|
|
|
|
do {
|
|
com = GetRequest();
|
|
if (com != CMD_INIT) {
|
|
DbgLog((LOG_ERROR, 1, TEXT("Thread expected init command")));
|
|
Reply((DWORD) E_UNEXPECTED);
|
|
}
|
|
} while (com != CMD_INIT);
|
|
|
|
DbgLog((LOG_TRACE, 1, TEXT("CSourceStream worker thread initializing")));
|
|
|
|
hr = OnThreadCreate(); // perform set up tasks
|
|
if (FAILED(hr)) {
|
|
DbgLog((LOG_ERROR, 1, TEXT("CSourceStream::OnThreadCreate failed. Aborting thread.")));
|
|
OnThreadDestroy();
|
|
Reply(hr); // send failed return code from OnThreadCreate
|
|
return 1;
|
|
}
|
|
|
|
// Initialisation suceeded
|
|
Reply(NOERROR);
|
|
|
|
Command cmd;
|
|
do {
|
|
cmd = GetRequest();
|
|
|
|
switch (cmd) {
|
|
|
|
case CMD_EXIT:
|
|
Reply(NOERROR);
|
|
break;
|
|
|
|
case CMD_RUN:
|
|
DbgLog((LOG_ERROR, 1, TEXT("CMD_RUN received before a CMD_PAUSE???")));
|
|
// !!! fall through???
|
|
|
|
case CMD_PAUSE:
|
|
Reply(NOERROR);
|
|
DoBufferProcessingLoop();
|
|
break;
|
|
|
|
case CMD_STOP:
|
|
Reply(NOERROR);
|
|
break;
|
|
|
|
default:
|
|
DbgLog((LOG_ERROR, 1, TEXT("Unknown command %d received!"), cmd));
|
|
Reply((DWORD) E_NOTIMPL);
|
|
break;
|
|
}
|
|
} while (cmd != CMD_EXIT);
|
|
|
|
hr = OnThreadDestroy(); // tidy up.
|
|
if (FAILED(hr)) {
|
|
DbgLog((LOG_ERROR, 1, TEXT("CSourceStream::OnThreadDestroy failed. Exiting thread.")));
|
|
return 1;
|
|
}
|
|
|
|
DbgLog((LOG_TRACE, 1, TEXT("CSourceStream worker thread exiting")));
|
|
return 0;
|
|
}
|
|
|
|
|
|
//
|
|
// DoBufferProcessingLoop
|
|
//
|
|
// Grabs a buffer and calls the users processing function.
|
|
// Overridable, so that different delivery styles can be catered for.
|
|
HRESULT CSourceStream::DoBufferProcessingLoop(void) {
|
|
|
|
Command com;
|
|
|
|
OnThreadStartPlay();
|
|
|
|
do {
|
|
while (!CheckRequest(&com)) {
|
|
|
|
IMediaSample *pSample;
|
|
|
|
HRESULT hr = GetDeliveryBuffer(&pSample,NULL,NULL,0);
|
|
if (FAILED(hr)) {
|
|
Sleep(1);
|
|
continue; // go round again. Perhaps the error will go away
|
|
// or the allocator is decommited & we will be asked to
|
|
// exit soon.
|
|
}
|
|
|
|
// Virtual function user will override.
|
|
hr = FillBuffer(pSample);
|
|
|
|
if (hr == S_OK) {
|
|
hr = Deliver(pSample);
|
|
pSample->Release();
|
|
|
|
// downstream filter returns S_FALSE if it wants us to
|
|
// stop or an error if it's reporting an error.
|
|
if(hr != S_OK)
|
|
{
|
|
DbgLog((LOG_TRACE, 2, TEXT("Deliver() returned %08x; stopping"), hr));
|
|
return S_OK;
|
|
}
|
|
|
|
} else if (hr == S_FALSE) {
|
|
// derived class wants us to stop pushing data
|
|
pSample->Release();
|
|
DeliverEndOfStream();
|
|
return S_OK;
|
|
} else {
|
|
// derived class encountered an error
|
|
pSample->Release();
|
|
DbgLog((LOG_ERROR, 1, TEXT("Error %08lX from FillBuffer!!!"), hr));
|
|
DeliverEndOfStream();
|
|
m_pFilter->NotifyEvent(EC_ERRORABORT, hr, 0);
|
|
return hr;
|
|
}
|
|
|
|
// all paths release the sample
|
|
}
|
|
|
|
// For all commands sent to us there must be a Reply call!
|
|
|
|
if (com == CMD_RUN || com == CMD_PAUSE) {
|
|
Reply(NOERROR);
|
|
} else if (com != CMD_STOP) {
|
|
Reply((DWORD) E_UNEXPECTED);
|
|
DbgLog((LOG_ERROR, 1, TEXT("Unexpected command!!!")));
|
|
}
|
|
} while (com != CMD_STOP);
|
|
|
|
return S_FALSE;
|
|
}
|
|
|