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/*
* ringbuffer.h: A threaded ring buffer
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: ringbuffer.h 1.3 2001/08/02 13:48:42 kls Exp $
*/
#ifndef __RINGBUFFER_H
#define __RINGBUFFER_H
#include "thread.h"
typedef unsigned char uchar;
class cRingBufferInputThread;
class cRingBufferOutputThread;
class cRingBuffer {
friend class cRingBufferInputThread;
friend class cRingBufferOutputThread;
private:
cRingBufferInputThread *inputThread;
cRingBufferOutputThread *outputThread;
cMutex mutex;
int size, head, tail;
uchar *buffer;
int maxFill;
bool busy;
bool statistics;
protected:
void Lock(void) { mutex.Lock(); }
void Unlock(void) { mutex.Unlock(); }
int Available(void);
int Free(void) { return size - Available() - 1; }
bool Busy(void) { return busy; }
void Clear(void);
// Immediately clears the ring buffer.
int Put(const uchar *Data, int Count);
// Puts at most Count bytes of Data into the ring buffer.
// Returns the number of bytes actually stored.
int Get(uchar *Data, int Count);
// Gets at most Count bytes of Data from the ring buffer.
// Returns the number of bytes actually retrieved.
virtual void Input(void) = 0;
// Runs as a separate thread and shall continuously read data from
// a source and call Put() to store the data in the ring buffer.
virtual void Output(void) = 0;
// Runs as a separate thread and shall continuously call Get() to
// retrieve data from the ring buffer and write it to a destination.
public:
cRingBuffer(int Size, bool Statistics = false);
virtual ~cRingBuffer();
bool Start(void);
bool Active(void);
void Stop(void);
};
#endif // __RINGBUFFER_H
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