BufferFilter.h

/* 
 *      Copyright (C) 2003-2005 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, 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 GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *  http://www.gnu.org/copyleft/gpl.html
 *
 */

#pragma once

#include <atlbase.h>

[uuid("63EF0035-3FFE-4c41-9230-4346E028BE20")]
interface IBufferFilter : public IUnknown
{
        STDMETHOD(SetBuffers) (int nBuffers) = 0;
        STDMETHOD_(int, GetBuffers) () = 0;
        STDMETHOD_(int, GetFreeBuffers) () = 0;
        STDMETHOD(SetPriority) (DWORD dwPriority = THREAD_PRIORITY_NORMAL) = 0;
};

[uuid("DA2B3D77-2F29-4fd2-AC99-DEE4A8A13BF0")]
class CBufferFilter : public CTransformFilter, public IBufferFilter
{
        int m_nSamplesToBuffer;

public:
        CBufferFilter(LPUNKNOWN lpunk, HRESULT* phr);
        virtual ~CBufferFilter();

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

        // IBufferFilter
        STDMETHODIMP SetBuffers(int nBuffers);
        STDMETHODIMP_(int) GetBuffers();
        STDMETHODIMP_(int) GetFreeBuffers();
        STDMETHODIMP SetPriority(DWORD dwPriority = THREAD_PRIORITY_NORMAL);

        HRESULT Receive(IMediaSample* pSample);
        HRESULT Transform(IMediaSample* pIn, IMediaSample* pOut);
    HRESULT CheckInputType(const CMediaType* mtIn);
    HRESULT CheckTransform(const CMediaType* mtIn, const CMediaType* mtOut);
    HRESULT DecideBufferSize(IMemAllocator* pAllocator, ALLOCATOR_PROPERTIES* pProperties);
    HRESULT GetMediaType(int iPosition, CMediaType* pMediaType);
        HRESULT StopStreaming();
};

class CBufferFilterOutputPin : public CTransformOutputPin
{
        class CBufferFilterOutputQueue : public COutputQueue
        {
        public:
                CBufferFilterOutputQueue(IPin* pInputPin, HRESULT* phr,
                                DWORD dwPriority = THREAD_PRIORITY_NORMAL,
                                BOOL bAuto = FALSE, BOOL bQueue = TRUE,
                                LONG lBatchSize = 1, BOOL bBatchExact = FALSE,
                                LONG lListSize = DEFAULTCACHE,
                                bool bFlushingOpt = false)
                        : COutputQueue(pInputPin, phr, bAuto, bQueue, lBatchSize, bBatchExact, lListSize, dwPriority, bFlushingOpt)
                {
                }

                int GetQueueCount()
                {
                        return m_List ? m_List->GetCount() : -1;
                }

                bool SetPriority(DWORD dwPriority)
                {
                        return m_hThread ? !!::SetThreadPriority(m_hThread, dwPriority) : false;
                }
        };

public:
        CBufferFilterOutputPin(CTransformFilter* pFilter, HRESULT* phr);

        CAutoPtr<CBufferFilterOutputQueue> m_pOutputQueue;

        HRESULT Active();
    HRESULT Inactive();

        HRESULT Deliver(IMediaSample* pMediaSample);
    HRESULT DeliverEndOfStream();
    HRESULT DeliverBeginFlush();
        HRESULT DeliverEndFlush();
    HRESULT DeliverNewSegment(REFERENCE_TIME tStart, REFERENCE_TIME tStop, double dRate);
};

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