fbbufctl.h
上传用户:zhongxx05
上传日期:2007-06-06
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文件大小:8k
- /* ***** 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 FBBUFCTL_H
- #define FBBUFCTL_H
- #include "hxbufctl.h"
- #include "hxengin.h"
- #include "hxcore.h"
- #include "hxsmbw.h"
- #include "hxerror.h"
- #include "hxprefs.h" // IHXPreferences
- #include "hxpends.h" // IHXPendingStatus
- class HXFeedbackControl
- {
- public:
- HXFeedbackControl();
-
- void Init(double c, double wn, double Kv, double delt);
- void Reset(UINT32 ulSetPoint,
- INT32 e1, INT32 e2,
- UINT32 c1, UINT32 c2);
- void SetLimits(UINT32 ulMin, UINT32 ulMax);
- UINT32 Control(UINT32 ulCurrentBits);
- double SamplePeriod() const { return m_delt;}
- UINT32 SetPoint() const {return m_ulSetPoint;}
- UINT32 Min() const { return m_ulMin;}
- UINT32 Max() const { return m_ulMax;}
- private:
- UINT32 RoundAndClip(double value) const;
- void Enqueue(INT32 error, UINT32 ulBandwidth);
- double m_delt; // Sample period sec
- double m_a1; // Weights in bandwith computation
- double m_a2;
- double m_b1;
- double m_b2;
- UINT32 m_ulSetPoint; // Target value to stablize at
- // Output clipping values
- UINT32 m_ulMin; // Minimum output value
- UINT32 m_ulMax; // Maximum output value
- INT32 m_e1; // Error history
- INT32 m_e2;
- UINT32 m_c1; // Control history
- UINT32 m_c2;
- };
- class HXFeedbackBufferControl : public IHXBufferControl,
- public IHXCallback
- {
- public:
- HXFeedbackBufferControl();
- /*
- * 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);
- /************************************************************************
- * Method:
- * IHXCallback::Func
- * Purpose:
- * This is the function that will be called when a callback is
- * to be executed.
- */
- STDMETHOD(Func) (THIS);
- private:
- typedef enum {csError,
- csNotInitialized,
- csInitialized,
- csBuffering,
- csPlaying,
- csPaused,
- csSeeking,
- csClipEnd} ControlState;
- ~HXFeedbackBufferControl();
- void ChangeState(ControlState newState);
- BOOL Initialized() const { return (csInitialized <= m_state);}
- void ScheduleCallback();
- void StartCallback();
- void StopCallback();
- HX_RESULT GetBwInfo(REF(UINT32) ulClipBw,
- REF(UINT16) nControlStream, REF(UINT32) ulControlBw);
- HX_RESULT GetStreamBw(UINT16 uStreamNumber, REF(UINT32) ulBandwidth);
- BOOL IsAudioStream(UINT16 uStreamNumber);
-
- void GetControlData(REF(UINT32) ulTotalBits,
- REF(UINT32) ulControlBits);
- HX_RESULT Control(UINT32 ulControlBits, REF(UINT32) ulNewBandwidth);
- void SetBandwidth(UINT32 ulBandwidth);
- HX_RESULT ReadPrefSettings();
- void SetTransportByteLimits(UINT32 ulClipBw);
- BOOL IsBuffering();
- UINT32 ControlToTotal(UINT32 ulValue);
- UINT32 TotalToControl(UINT32 ulValue);
- UINT32 MulDiv(UINT32 ulValue, UINT32 ulMult, UINT32 ulDiv);
-
- UINT32 ClampBandwidth(UINT32 ulBandwidth) const;
- // Used to initialize functionallity related to testing
- HX_RESULT InitTesting(IUnknown* pContext);
- ULONG32 m_lRefCount;
- IHXScheduler* m_pScheduler;
- CallbackHandle m_callbackHandle;
- HXTimeval m_lastTime;
- IHXStreamSource* m_pSource;
- IHXSourceBufferingStats2* m_pBufferStats;
- IHXThinnableSource* m_pThin;
- IHXPreferences* m_pPrefs;
- IHXPendingStatus* m_pStatus;
- IHXErrorMessages* m_pErrMsg;
-
- HXFeedbackControl m_control; // control algorithm
- UINT32 m_ulClipBw; // Clip bandwidth
- // Control stream values
- UINT16 m_nControlStream; // Control stream index
- UINT32 m_ulControlBw; // Control stream bandwidth
- BOOL m_bControlTotal; // Control total buffer?
- BOOL m_bPaused;
- ControlState m_state;
- };
- #endif /* FBBUFCTL_H */