fastreadstream.h

VC++视频开发实例集锦(包括“远程视频监控”"语音识别系统"等13个经典例子)

//	VirtualDub - Video processing and capture application
//	Copyright (C) 1998-2001 Avery Lee
//
//	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 of the License, 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 this program; if not, write to the Free Software
//	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

#ifndef f_VIRTUALDUB_FASTREADSTREAM_H
#define f_VIRTUALDUB_FASTREADSTREAM_H

#include <windows.h>

class FastReadStreamHeader;

class FastReadStream {
public:
	FastReadStream(HANDLE hFile, long lBlockCount, long lBlockSize);
	FastReadStream(int iFile, long lBlockCount, long lBlockSize);
	~FastReadStream();

	bool Ready();
	long Read(int stream, __int64 i64Pos, void *pBuffer, long lBytes);
	void Flush();

private:
	HANDLE hFile;
	int iFile;
	long lBlockCount;
	long lBlockSize;
	long lHistory;

	FastReadStreamHeader *pHeaders;
	void *pBuffer;

	void _Init(long lBlockCount, long lBlockSize);
	int _PickVictim(int stream);
	int _Commit(int stream, __int64 i64BlockNo);
};

#endif