casyncbuffer.h

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: casyncbuffer.h,v 1.1.1.1.50.3 2004/07/09 01:44:13 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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 * The contents of this file, and the files included with this file,
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 * Source License (the "RPSL") available at
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 * the file under the current version of the RealNetworks Community
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 * will apply. You may also obtain the license terms directly from
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 * ***** END LICENSE BLOCK ***** */

#pragma once

class CAsyncBuffer {

	private:
	
		Ptr		mBuffer;
		Size	mSize;
		
		long	mLim;
		long	mMark;
		
		QHdr	mPBQueue;
		short	mBusy;
		
		short	mClearIndex;
		
	public:
	
						CAsyncBuffer	(Size		inSize,
										 QElemPtr	inpb = nil);
		virtual			~CAsyncBuffer	(void);
		
		inline	OSErr	PBAlloc			(QElemPtr	inpb)
										{return ::Dequeue (inpb, &mPBQueue);};
		inline	void	PBFree			(QElemPtr	inpb)
										{if (inpb) ::Enqueue (inpb, &mPBQueue);};
										
		inline	short	Busy			(void) const
										{return mBusy;};
		inline	void	SetBusy			(void)
										{mBusy++;};
		inline	void	ClearBusy		(void)
										{mBusy--;};
		
		inline	Size	BufferSize		(void) const
										{return mSize;};
		inline	Ptr		Buffer			(void) const
										{return mBuffer;};
		inline	long	Lim				(void) const
										{return mLim;};
		
		inline	long	Available		(void) const
										{return mSize - mMark;};
		inline	long	Remaining		(void) const
										{return mLim - mMark;};
				
		inline	void	Load			(long			inLim)
										{mLim = inLim; mMark = 0;};
				long	Read			(void			*inBuffer,
										 long			inBufferLen);
				long	Write			(const	void	*inBuffer,
										 long			inBufferLen);
										 
				void	NextClearIndex	(void) {mClearIndex = 1 - mClearIndex;};
				void	ClearBuffer		(void);
				void	DebugBuffer		(void);
	};