StreamSwitcher.h

// Copyright 2003 Gabest.
// http://www.gabest.org
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA, or visit
// http://www.gnu.org/copyleft/gpl.html

#pragma once

#include <afxtempl.h>
#include <atlbase.h>
#include <atlcoll.h>

#define PauseGraph \
        CComQIPtr<IMediaControl> _pMC(m_pGraph); \
        OAFilterState _fs = -1; \
        if(_pMC) _pMC->GetState(1000, &_fs); \
        if(_fs == State_Running) \
                _pMC->Pause(); \
 \
        HRESULT _hr = E_FAIL; \
        CComQIPtr<IMediaSeeking> _pMS((IUnknown*)(INonDelegatingUnknown*)m_pGraph); \
        LONGLONG _rtNow = 0; \
        if(_pMS) _hr = _pMS->GetCurrentPosition(&_rtNow); \

#define ResumeGraph \
        if(SUCCEEDED(_hr) && _pMS) \
                _hr = _pMS->SetPositions(&_rtNow, AM_SEEKING_AbsolutePositioning, NULL, AM_SEEKING_NoPositioning); \
 \
        if(_fs == State_Running && _pMS) \
                _pMC->Run(); \

class CStreamSwitcherFilter;

class CStreamSwitcherPassThru : public IMediaSeeking, public CMediaPosition
{
protected:
        CStreamSwitcherFilter* m_pFilter;

public:
    CStreamSwitcherPassThru(LPUNKNOWN, HRESULT* phr, CStreamSwitcherFilter* pFilter);

        DECLARE_IUNKNOWN
    STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, void** ppv);

    // IMediaSeeking methods
    STDMETHODIMP GetCapabilities(DWORD* pCapabilities);
    STDMETHODIMP CheckCapabilities(DWORD* pCapabilities);
    STDMETHODIMP SetTimeFormat(const GUID* pFormat);
    STDMETHODIMP GetTimeFormat(GUID* pFormat);
    STDMETHODIMP IsUsingTimeFormat(const GUID* pFormat);
    STDMETHODIMP IsFormatSupported(const GUID* pFormat);
    STDMETHODIMP QueryPreferredFormat(GUID* pFormat);
    STDMETHODIMP ConvertTimeFormat(LONGLONG* pTarget, const GUID* pTargetFormat, LONGLONG Source, const GUID* pSourceFormat);
    STDMETHODIMP SetPositions(LONGLONG* pCurrent, DWORD CurrentFlags, LONGLONG* pStop, DWORD StopFlags);
    STDMETHODIMP GetPositions(LONGLONG* pCurrent, LONGLONG* pStop);
    STDMETHODIMP GetCurrentPosition(LONGLONG* pCurrent);
    STDMETHODIMP GetStopPosition(LONGLONG* pStop);
    STDMETHODIMP SetRate(double dRate);
    STDMETHODIMP GetRate(double* pdRate);
    STDMETHODIMP GetDuration(LONGLONG* pDuration);
    STDMETHODIMP GetAvailable(LONGLONG* pEarliest, LONGLONG* pLatest);
    STDMETHODIMP GetPreroll(LONGLONG* pllPreroll);

    // IMediaPosition properties
    STDMETHODIMP get_Duration(REFTIME* plength);
    STDMETHODIMP put_CurrentPosition(REFTIME llTime);
    STDMETHODIMP get_StopTime(REFTIME* pllTime);
    STDMETHODIMP put_StopTime(REFTIME llTime);
    STDMETHODIMP get_PrerollTime(REFTIME* pllTime);
    STDMETHODIMP put_PrerollTime(REFTIME llTime);
    STDMETHODIMP get_Rate(double* pdRate);
    STDMETHODIMP put_Rate(double dRate);
    STDMETHODIMP get_CurrentPosition(REFTIME* pllTime);
    STDMETHODIMP CanSeekForward(LONG* pCanSeekForward);
    STDMETHODIMP CanSeekBackward(LONG* pCanSeekBackward);
};

class CStreamSwitcherInputPin;

class CStreamSwitcherAllocator : public CMemAllocator
{
protected:
    CStreamSwitcherInputPin* m_pPin;

    CMediaType m_mt;
        bool m_fMediaTypeChanged;

public:
        CStreamSwitcherAllocator(CStreamSwitcherInputPin* pPin, HRESULT* phr);
#ifdef DEBUG
        ~CStreamSwitcherAllocator();
#endif

        STDMETHODIMP_(ULONG) NonDelegatingAddRef();
        STDMETHODIMP_(ULONG) NonDelegatingRelease();

        STDMETHODIMP GetBuffer(
                IMediaSample** ppBuffer, 
                REFERENCE_TIME* pStartTime, REFERENCE_TIME* pEndTime, 
                DWORD dwFlags);

        void NotifyMediaType(const CMediaType& mt);
};

[uuid("DA395FA3-4A3E-4D85-805E-0BEFF53D4BCD")]
interface IStreamSwitcherInputPin : public IUnknown
{
        STDMETHOD_(bool, IsActive)() = 0;
};

class CStreamSwitcherInputPin : public CBaseInputPin, public IPinConnection, public IStreamSwitcherInputPin
{
        friend class CStreamSwitcherAllocator;

        CStreamSwitcherAllocator m_Allocator;

        BOOL m_bSampleSkipped;
        BOOL m_bQualityChanged;
        BOOL m_bUsingOwnAllocator;

        CAMEvent m_evBlock;
        bool m_fCanBlock;
        HRESULT Active();
        HRESULT Inactive();

        HRESULT QueryAcceptDownstream(const AM_MEDIA_TYPE* pmt);

        HRESULT InitializeOutputSample(IMediaSample* pInSample, IMediaSample** ppOutSample);

        HANDLE m_hNotifyEvent;

public:
    CStreamSwitcherInputPin(CStreamSwitcherFilter* pFilter, HRESULT* phr, LPCWSTR pName);

        DECLARE_IUNKNOWN
    STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, void** ppv);

    CMediaType& CurrentMediaType() {return m_mt;}
        IMemAllocator* CurrentAllocator() {return m_pAllocator;}

        bool IsUsingOwnAllocator() {return m_bUsingOwnAllocator == TRUE;}

        void Block(bool fBlock);

        CCritSec m_csReceive;

        // pure virtual
        HRESULT CheckMediaType(const CMediaType* pmt);

        // virtual
        HRESULT CheckConnect(IPin* pPin);
        HRESULT CompleteConnect(IPin* pReceivePin);

        // IPin
        STDMETHODIMP QueryAccept(const AM_MEDIA_TYPE* pmt);
        STDMETHODIMP ReceiveConnection(IPin* pConnector, const AM_MEDIA_TYPE* pmt);
        STDMETHODIMP GetAllocator(IMemAllocator** ppAllocator);
        STDMETHODIMP NotifyAllocator(IMemAllocator* pAllocator, BOOL bReadOnly);
        STDMETHODIMP BeginFlush();
    STDMETHODIMP EndFlush();
        STDMETHODIMP EndOfStream();

        // IMemInputPin
    STDMETHODIMP Receive(IMediaSample* pSample);
        STDMETHODIMP NewSegment(REFERENCE_TIME tStart, REFERENCE_TIME tStop, double dRate);

        // IPinConnection
        STDMETHODIMP DynamicQueryAccept(const AM_MEDIA_TYPE* pmt);
        STDMETHODIMP NotifyEndOfStream(HANDLE hNotifyEvent);
        STDMETHODIMP IsEndPin();
        STDMETHODIMP DynamicDisconnect();

        // IStreamSwitcherInputPin
        STDMETHODIMP_(bool) IsActive();
};

class CStreamSwitcherOutputPin : public CBaseOutputPin, public IStreamBuilder
{
        CComPtr<IUnknown> m_pStreamSwitcherPassThru;
        CComPtr<IPinConnection> m_pPinConnection;

        HRESULT QueryAcceptUpstream(const AM_MEDIA_TYPE* pmt);

public:
    CStreamSwitcherOutputPin(CStreamSwitcherFilter* pFilter, HRESULT* phr);

        DECLARE_IUNKNOWN
    STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, void** ppv);

    CMediaType& CurrentMediaType() {return m_mt;}
        IMemAllocator* CurrentAllocator() {return m_pAllocator;}
        IPinConnection* CurrentPinConnection() {return m_pPinConnection;}

        // pure virtual
        HRESULT DecideBufferSize(IMemAllocator* pAllocator, ALLOCATOR_PROPERTIES* pProperties);

        // virtual
        HRESULT CheckConnect(IPin* pPin);
        HRESULT BreakConnect();
        HRESULT CompleteConnect(IPin* pReceivePin);

        HRESULT CheckMediaType(const CMediaType* pmt);
        HRESULT GetMediaType(int iPosition, CMediaType* pmt);

        // IPin
        STDMETHODIMP QueryAccept(const AM_MEDIA_TYPE* pmt);

        // IQualityControl
        STDMETHODIMP Notify(IBaseFilter* pSender, Quality q);

        // IStreamBuilder
        STDMETHODIMP Render(IPin* ppinOut, IGraphBuilder* pGraph);
        STDMETHODIMP Backout(IPin* ppinOut, IGraphBuilder* pGraph);
};

class CStreamSwitcherFilter : public CBaseFilter, public IAMStreamSelect
{
        friend class CStreamSwitcherInputPin;
        friend class CStreamSwitcherOutputPin;
        friend class CStreamSwitcherPassThru;

        CList<CStreamSwitcherInputPin*> m_pInputs;
        CStreamSwitcherInputPin* m_pInput;
        CStreamSwitcherOutputPin* m_pOutput;

        CCritSec m_csState, m_csPins;

        HRESULT CompleteConnect(PIN_DIRECTION dir, CBasePin* pPin, IPin* pReceivePin);

protected:
        void SelectInput(CStreamSwitcherInputPin* pInput);

public:
        CStreamSwitcherFilter(LPUNKNOWN lpunk, HRESULT* phr, const CLSID& clsid);
        virtual ~CStreamSwitcherFilter();

        DECLARE_IUNKNOWN
    STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, void** ppv);

        int GetPinCount();
        CBasePin* GetPin(int n);

        int GetConnectedInputPinCount();
        CStreamSwitcherInputPin* GetConnectedInputPin(int n);
        CStreamSwitcherInputPin* GetInputPin();
        CStreamSwitcherOutputPin* GetOutputPin();

        bool m_fResetOutputMediaType;
        void ResetOutputMediaType() {m_fResetOutputMediaType = true;}

        // override these
        virtual HRESULT CheckMediaType(const CMediaType* pmt) = 0;
        virtual HRESULT Transform(IMediaSample* pIn, IMediaSample* pOut);
        virtual CMediaType CreateNewOutputMediaType(CMediaType mt, long& cbBuffer);
        virtual void OnNewOutputMediaType(const CMediaType& mtIn, const CMediaType& mtOut) {}

        // IAMStreamSelect
    STDMETHODIMP Count(DWORD* pcStreams);
    STDMETHODIMP Info(long lIndex, AM_MEDIA_TYPE** ppmt, DWORD* pdwFlags, LCID* plcid, DWORD* pdwGroup, WCHAR** ppszName, IUnknown** ppObject, IUnknown** ppUnk);
    STDMETHODIMP Enable(long lIndex, DWORD dwFlags);
};

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