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// Copyright (c) 2012 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.
// Implement a simple base class for DirectShow filters. It may only be used in
// a single threaded apartment.
#ifndef MEDIA_CAPTURE_VIDEO_WIN_FILTER_BASE_WIN_H_
#define MEDIA_CAPTURE_VIDEO_WIN_FILTER_BASE_WIN_H_
// Avoid including strsafe.h via dshow as it will cause build warnings.
#define NO_DSHOW_STRSAFE
#include <dshow.h>
#include <stddef.h>
#include <wrl/client.h>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
namespace media {
class FilterBase : public IBaseFilter, public base::RefCounted<FilterBase> {
public:
FilterBase();
// Number of pins connected to this filter.
virtual size_t NoOfPins() = 0;
// Returns the IPin interface pin no index.
virtual IPin* GetPin(int index) = 0;
// Inherited from IUnknown.
STDMETHOD(QueryInterface)(REFIID id, void** object_ptr) override;
STDMETHOD_(ULONG, AddRef)() override;
STDMETHOD_(ULONG, Release)() override;
// Inherited from IBaseFilter.
STDMETHOD(EnumPins)(IEnumPins** enum_pins) override;
STDMETHOD(FindPin)(LPCWSTR id, IPin** pin) override;
STDMETHOD(QueryFilterInfo)(FILTER_INFO* info) override;
STDMETHOD(JoinFilterGraph)(IFilterGraph* graph, LPCWSTR name) override;
STDMETHOD(QueryVendorInfo)(LPWSTR* vendor_info) override;
// Inherited from IMediaFilter.
STDMETHOD(Stop)() override;
STDMETHOD(Pause)() override;
STDMETHOD(Run)(REFERENCE_TIME start) override;
STDMETHOD(GetState)(DWORD msec_timeout, FILTER_STATE* state) override;
STDMETHOD(SetSyncSource)(IReferenceClock* clock) override;
STDMETHOD(GetSyncSource)(IReferenceClock** clock) override;
// Inherited from IPersistent.
STDMETHOD(GetClassID)(CLSID* class_id) override = 0;
protected:
friend class base::RefCounted<FilterBase>;
virtual ~FilterBase();
private:
FILTER_STATE state_;
Microsoft::WRL::ComPtr<IFilterGraph> owning_graph_;
DISALLOW_COPY_AND_ASSIGN(FilterBase);
};
} // namespace media
#endif // MEDIA_CAPTURE_VIDEO_WIN_FILTER_BASE_WIN_H_
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