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# BufferFilter.h

    00001 /*
    00002  *      Copyright (C) 2003-2005 Gabest
    00003  *      http://www.gabest.org
    00004  *
    00005  *  This Program is free software; you can redistribute it and/or modify
    00006  *  it under the terms of the GNU General Public License as published by
    00007  *  the Free Software Foundation; either version 2, or (at your option)
    00008  *  any later version.
    00009  *
    00010  *  This Program is distributed in the hope that it will be useful,
    00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    00013  *  GNU General Public License for more details.
    00014  *
    00015  *  You should have received a copy of the GNU General Public License
    00016  *  along with GNU Make; see the file COPYING.  If not, write to
    00017  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
    00018  *  http://www.gnu.org/copyleft/gpl.html
    00019  *
    00020  */
    00021
    00022 #pragma once
    00023
    00024 #include <atlbase.h>
    00025
    00026 [uuid("63EF0035-3FFE-4c41-9230-4346E028BE20")]
    00027 interface IBufferFilter : public IUnknown
    00028 {
    00029         STDMETHOD(SetBuffers) (int nBuffers) = 0;
    00030         STDMETHOD_(int, GetBuffers) () = 0;
    00031         STDMETHOD_(int, GetFreeBuffers) () = 0;
    00032         STDMETHOD(SetPriority) (DWORD dwPriority = THREAD_PRIORITY_NORMAL) = 0;
    00033 };
    00034
    00035 [uuid("DA2B3D77-2F29-4fd2-AC99-DEE4A8A13BF0")]
    00036 class CBufferFilter : public CTransformFilter, public IBufferFilter
    00037 {
    00038         int m_nSamplesToBuffer;
    00039
    00040 public:
    00041         CBufferFilter(LPUNKNOWN lpunk, HRESULT* phr);
    00042         virtual ~CBufferFilter();
    00043
    00044         DECLARE_IUNKNOWN
    00045     STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, void** ppv);
    00046
    00047         // IBufferFilter
    00048         STDMETHODIMP SetBuffers(int nBuffers);
    00049         STDMETHODIMP_(int) GetBuffers();
    00050         STDMETHODIMP_(int) GetFreeBuffers();
    00051         STDMETHODIMP SetPriority(DWORD dwPriority = THREAD_PRIORITY_NORMAL);
    00052
    00053         HRESULT Receive(IMediaSample* pSample);
    00054         HRESULT Transform(IMediaSample* pIn, IMediaSample* pOut);
    00055     HRESULT CheckInputType(const CMediaType* mtIn);
    00056     HRESULT CheckTransform(const CMediaType* mtIn, const CMediaType* mtOut);
    00057     HRESULT DecideBufferSize(IMemAllocator* pAllocator, ALLOCATOR_PROPERTIES* pProperties);
    00058     HRESULT GetMediaType(int iPosition, CMediaType* pMediaType);
    00059         HRESULT StopStreaming();
    00060 };
    00061
    00062 class CBufferFilterOutputPin : public CTransformOutputPin
    00063 {
    00064         class CBufferFilterOutputQueue : public COutputQueue
    00065         {
    00066         public:
    00067                 CBufferFilterOutputQueue(IPin* pInputPin, HRESULT* phr,
    00068                                 DWORD dwPriority = THREAD_PRIORITY_NORMAL,
    00069                                 BOOL bAuto = FALSE, BOOL bQueue = TRUE,
    00070                                 LONG lBatchSize = 1, BOOL bBatchExact = FALSE,
    00071                                 LONG lListSize = DEFAULTCACHE,
    00072                                 bool bFlushingOpt = false)
    00073                         : COutputQueue(pInputPin, phr, bAuto, bQueue, lBatchSize, bBatchExact, lListSize, dwPriority, bFlushingOpt)
    00074                 {
    00075                 }
    00076
    00077                 int GetQueueCount()
    00078                 {
    00079                         return m_List ? m_List->GetCount() : -1;
    00080                 }
    00081
    00082                 bool SetPriority(DWORD dwPriority)
    00083                 {
    00084                         return m_hThread ? !!::SetThreadPriority(m_hThread, dwPriority) : false;
    00085                 }
    00086         };
    00087
    00088 public:
    00089         CBufferFilterOutputPin(CTransformFilter* pFilter, HRESULT* phr);
    00090
    00091         CAutoPtr<CBufferFilterOutputQueue> m_pOutputQueue;
    00092
    00093         HRESULT Active();
    00094     HRESULT Inactive();
    00095
    00096         HRESULT Deliver(IMediaSample* pMediaSample);
    00097     HRESULT DeliverEndOfStream();
    00098     HRESULT DeliverBeginFlush();
    00099         HRESULT DeliverEndFlush();
    00100     HRESULT DeliverNewSegment(REFERENCE_TIME tStart, REFERENCE_TIME tStop, double dRate);
    00101 };