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/*
* ringbuffer.h: A ring buffer
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: ringbuffer.h 1.9 2003/01/26 09:47:39 kls Exp $
*/
#ifndef __RINGBUFFER_H
#define __RINGBUFFER_H
#include "thread.h"
#include "tools.h"
class cRingBuffer {
private:
cMutex mutex;
cCondVar readyForPut, readyForGet;
cMutex putMutex, getMutex;
int size;
protected:
int maxFill;//XXX
int lastPercent;
bool statistics;//XXX
void WaitForPut(void);
void WaitForGet(void);
void EnablePut(void);
void EnableGet(void);
virtual void Clear(void) = 0;
virtual int Available(void) = 0;
int Free(void) { return size - Available() - 1; }
void Lock(void) { mutex.Lock(); }
void Unlock(void) { mutex.Unlock(); }
int Size(void) { return size; }
public:
cRingBuffer(int Size, bool Statistics = false);
virtual ~cRingBuffer();
};
class cRingBufferLinear : public cRingBuffer {
private:
int margin, head, tail;
int lastGet;
uchar *buffer;
pid_t getThreadPid;
public:
cRingBufferLinear(int Size, int Margin = 0, bool Statistics = false);
///< Creates a linear ring buffer.
///< The buffer will be able to hold at most Size bytes of data, and will
///< be guaranteed to return at least Margin bytes in one consecutive block.
virtual ~cRingBufferLinear();
virtual int Available(void);
virtual 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.
///< \return Returns the number of bytes actually stored.
const uchar *Get(int &Count);
///< Gets data from the ring buffer.
///< The data will remain in the buffer until a call to Del() deletes it.
///< \return Returns a pointer to the data, and stores the number of bytes
///< actually retrieved in Count. If the returned pointer is NULL, Count has no meaning.
void Del(int Count);
///< Deletes at most Count bytes from the ring buffer.
///< Count must be less or equal to the number that was returned by a previous
///< call to Get().
};
enum eFrameType { ftUnknown, ftVideo, ftAudio, ftDolby };
class cFrame {
friend class cRingBufferFrame;
private:
cFrame *next;
uchar *data;
int count;
eFrameType type;
int index;
public:
cFrame(const uchar *Data, int Count, eFrameType = ftUnknown, int Index = -1);
///< Creates a new cFrame object.
///< If Count is negative, the cFrame object will take ownership of the given
///< Data. Otherwise it will allocate Count bytes of memory and copy Data.
~cFrame();
const uchar *Data(void) const { return data; }
int Count(void) const { return count; }
eFrameType Type(void) const { return type; }
int Index(void) const { return index; }
};
class cRingBufferFrame : public cRingBuffer {
private:
cFrame *head;
int currentFill;
void Delete(const cFrame *Frame);
public:
cRingBufferFrame(int Size, bool Statistics = false);
virtual ~cRingBufferFrame();
virtual int Available(void);
virtual void Clear(void);
// Immediately clears the ring buffer.
bool Put(cFrame *Frame);
// Puts the Frame into the ring buffer.
// Returns true if this was possible.
const cFrame *Get(void);
// Gets the next frame from the ring buffer.
// The actual data still remains in the buffer until Drop() is called.
void Drop(const cFrame *Frame);
// Drops the Frame that has just been fetched with Get().
};
#endif // __RINGBUFFER_H
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