blob: 1669a4946ea6b7d2b5fd0d14f3c774544ab040ae (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*
* 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 1.1 2001/03/10 14:00:59 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;
protected:
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);
virtual ~cRingBuffer();
bool Start(void);
bool Active(void);
void Stop(void);
};
#endif // __RINGBUFFER_H
|
