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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/video/capture/win/filter_base_win.h"
#pragma comment(lib, "strmiids.lib")
namespace media {
// Implement IEnumPins.
class PinEnumerator
: public IEnumPins,
public base::RefCounted<PinEnumerator> {
public:
explicit PinEnumerator(FilterBase* filter)
: filter_(filter),
index_(0) {
}
~PinEnumerator() {
}
// IUnknown implementation.
STDMETHOD(QueryInterface)(REFIID iid, void** object_ptr) {
if (iid == IID_IEnumPins || iid == IID_IUnknown) {
AddRef();
*object_ptr = static_cast<IEnumPins*>(this);
return S_OK;
}
return E_NOINTERFACE;
}
STDMETHOD_(ULONG, AddRef)() {
base::RefCounted<PinEnumerator>::AddRef();
return 1;
}
STDMETHOD_(ULONG, Release)() {
base::RefCounted<PinEnumerator>::Release();
return 1;
}
// Implement IEnumPins.
STDMETHOD(Next)(ULONG count, IPin** pins, ULONG* fetched) {
ULONG pins_fetched = 0;
while (pins_fetched < count && filter_->NoOfPins() > index_) {
IPin* pin = filter_->GetPin(index_++);
pin->AddRef();
pins[pins_fetched++] = pin;
}
if (fetched)
*fetched = pins_fetched;
return pins_fetched == count ? S_OK : S_FALSE;
}
STDMETHOD(Skip)(ULONG count) {
if (filter_->NoOfPins()- index_ > count) {
index_ += count;
return S_OK;
}
index_ = 0;
return S_FALSE;
}
STDMETHOD(Reset)() {
index_ = 0;
return S_OK;
}
STDMETHOD(Clone)(IEnumPins** clone) {
PinEnumerator* pin_enum = new PinEnumerator(filter_);
if (!pin_enum)
return E_OUTOFMEMORY;
pin_enum->AddRef();
pin_enum->index_ = index_;
*clone = pin_enum;
return S_OK;
}
private:
scoped_refptr<FilterBase> filter_;
size_t index_;
};
FilterBase::FilterBase() : state_(State_Stopped) {
}
FilterBase::~FilterBase() {
}
STDMETHODIMP FilterBase::EnumPins(IEnumPins** enum_pins) {
*enum_pins = new PinEnumerator(this);
(*enum_pins)->AddRef();
return S_OK;
}
STDMETHODIMP FilterBase::FindPin(LPCWSTR id, IPin** pin) {
return E_NOTIMPL;
}
STDMETHODIMP FilterBase::QueryFilterInfo(FILTER_INFO* info) {
info->pGraph = owning_graph_;
info->achName[0] = L'\0';
if (info->pGraph)
info->pGraph->AddRef();
return S_OK;
}
STDMETHODIMP FilterBase::JoinFilterGraph(IFilterGraph* graph, LPCWSTR name) {
owning_graph_ = graph;
return S_OK;
}
STDMETHODIMP FilterBase::QueryVendorInfo(LPWSTR *pVendorInfo) {
return S_OK;
}
// Implement IMediaFilter.
STDMETHODIMP FilterBase::Stop() {
state_ = State_Stopped;
return S_OK;
}
STDMETHODIMP FilterBase::Pause() {
state_ = State_Paused;
return S_OK;
}
STDMETHODIMP FilterBase::Run(REFERENCE_TIME start) {
state_ = State_Running;
return S_OK;
}
STDMETHODIMP FilterBase::GetState(DWORD msec_timeout, FILTER_STATE* state) {
*state = state_;
return S_OK;
}
STDMETHODIMP FilterBase::SetSyncSource(IReferenceClock* clock) {
return S_OK;
}
STDMETHODIMP FilterBase::GetSyncSource(IReferenceClock** clock) {
return E_NOTIMPL;
}
// Implement from IPersistent.
STDMETHODIMP FilterBase::GetClassID(CLSID* class_id) {
NOTREACHED();
return E_NOTIMPL;
}
// Implement IUnknown.
STDMETHODIMP FilterBase::QueryInterface(REFIID id, void** object_ptr) {
if (id == IID_IMediaFilter || id == IID_IUnknown) {
*object_ptr = static_cast<IMediaFilter*>(this);
} else if (id == IID_IPersist) {
*object_ptr = static_cast<IPersist*>(this);
} else {
return E_NOINTERFACE;
}
AddRef();
return S_OK;
}
ULONG STDMETHODCALLTYPE FilterBase::AddRef() {
base::RefCounted<FilterBase>::AddRef();
return 1;
}
ULONG STDMETHODCALLTYPE FilterBase::Release() {
base::RefCounted<FilterBase>::Release();
return 1;
}
} // namespace media
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