wmbufctl.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK *****
 * Version: RCSL 1.0/RPSL 1.0
 *
 * Portions Copyright (c) 1995-2003 RealNetworks, Inc. All Rights Reserved.
 *
 * The contents of this file, and the files included with this file, are
 * subject to the current version of the RealNetworks Public Source License
 * Version 1.0 (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the RealNetworks Community Source License Version 1.0
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
 * in which case the RCSL will apply. You may also obtain the license terms
 * directly from RealNetworks.  You may not use this file except in
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
 * applicable to this file, the RCSL.  Please see the applicable RPSL or
 * RCSL for the rights, obligations and limitations governing use of the
 * contents of the file.
 *
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the portions
 * it created.
 *
 * This file, and the files included with this file, is distributed and made
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 *
 * Technology Compatibility Kit Test Suite(s) Location:
 *    http://www.helixcommunity.org/content/tck
 *
 * Contributor(s):
 *
 * ***** END LICENSE BLOCK ***** */
#ifndef WMBUFCTL_H
#define WMBUFCTL_H

#include "hxbufctl.h"

class HXWatermarkBufferControl : public IHXWatermarkBufferControl
{
public:
    HXWatermarkBufferControl();
    
    /*
     *	IUnknown methods
     */
    STDMETHOD(QueryInterface)   (THIS_
                                REFIID riid,
                                void** ppvObj);

    STDMETHOD_(ULONG32,AddRef)  (THIS);

    STDMETHOD_(ULONG32,Release) (THIS);

    /*
     * IHXBufferControl method
     */

    /************************************************************************
     *	Method:
     *	    IHXBufferControl::Init
     *	Purpose:
     *      Initialize the buffer control object with a context
     *      so it can find the interfaces it needs to do buffer
     *      control
     */
    STDMETHOD(Init) (THIS_ IUnknown* pContext);

    /************************************************************************
     *	Method:
     *	    IHXBufferControl::OnBuffering
     *	Purpose:
     *      Called while buffering
     */
    STDMETHOD(OnBuffering) (THIS_ UINT32 ulRemainingInMs,
			    UINT32 ulRemainingInBytes);

    /************************************************************************
     *	Method:
     *	    IHXBufferControl::OnBufferingDone
     *	Purpose:
     *      Called when buffering is done
     */
    STDMETHOD(OnBufferingDone)(THIS);


    /************************************************************************
     *	Method:
     *	    IHXBufferControl::OnResume
     *	Purpose:
     *      Called when playback is resumed
     */
    STDMETHOD(OnResume) (THIS);
    
    /************************************************************************
     *	Method:
     *	    IHXBufferControl::OnPause
     *	Purpose:
     *      Called when playback is paused
     */
    STDMETHOD(OnPause) (THIS);

    /************************************************************************
     *	Method:
     *	    IHXBufferControl::OnSeek
     *	Purpose:
     *      Called when a seek occurs
     */
    STDMETHOD(OnSeek) (THIS);

    /************************************************************************
     *	Method:
     *	    IHXBufferControl::OnClipEnd
     *	Purpose:
     *      Called when we get the last packet in the clip
     */
    STDMETHOD(OnClipEnd) (THIS);

    /************************************************************************
     *	Method:
     *	    IHXBufferControl::Close()
     *	Purpose:
     *      Called when the owner of this object wishes to shutdown
     *      and destroy this object. This call causes the buffer control
     *      object to release all it's interfaces references.
     */
    STDMETHOD(Close)(THIS);

    /*
     * IHXWatermarkBufferControl method
     */

    /************************************************************************
     *	Method:
     *	    IHXWatermarkBufferControl::SetSource
     *	Purpose:
     *      Tells the object what HXSource object it is associated with.
     */
    STDMETHOD(SetSource)(THIS_ HXSource* pSource);

    /************************************************************************
     *	Method:
     *	    IHXWatermarkBufferControl::OnBufferReport
     *	Purpose:
     *      Initiates control operations based on buffering information.
     *      
     */
    STDMETHOD(OnBufferReport)(THIS_ UINT32 ulBufferInMs,
			      UINT32 ulBuffer);

    /************************************************************************
     *	Method:
     *	    IHXWatermarkBufferControl::ClearChillState
     *	Purpose:
     *      Sets the chill state to NONE
     *      
     */
    STDMETHOD(ClearChillState)(THIS);

private:
    ~HXWatermarkBufferControl();
    HX_RESULT ChangeAccelerationStatus(BOOL bMayBeAccelerated,
				       BOOL bUseAccelerationFactor,
				       UINT32 ulAccelerationFactor);
    HX_RESULT ResetAccelState();

    ULONG32 m_lRefCount;
    HXSource* m_pSource;

    enum ChillState { HX_NONE, CHILL, HALF, HUNDRETH };

    enum ChillState m_ChillState;
};

#endif /* WMBUFCTL_H */