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108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
/*
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* ringbuffer.h: A ring buffer
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*
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* See the main source file 'vdr.c' for copyright information and
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* how to reach the author.
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*
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* $Id: ringbuffer.h 1.11 2003/05/11 09:48:23 kls Exp $
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*/
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#ifndef __RINGBUFFER_H
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#define __RINGBUFFER_H
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#include "thread.h"
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#include "tools.h"
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class cRingBuffer {
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private:
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cMutex mutex;
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int size;
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protected:
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int maxFill;//XXX
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int lastPercent;
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bool statistics;//XXX
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virtual void Clear(void) = 0;
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virtual int Available(void) = 0;
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int Free(void) { return size - Available() - 1; }
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void Lock(void) { mutex.Lock(); }
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void Unlock(void) { mutex.Unlock(); }
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int Size(void) { return size; }
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public:
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cRingBuffer(int Size, bool Statistics = false);
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virtual ~cRingBuffer();
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};
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class cRingBufferLinear : public cRingBuffer {
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private:
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int margin, head, tail;
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int lastGet;
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uchar *buffer;
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pid_t getThreadPid;
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public:
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cRingBufferLinear(int Size, int Margin = 0, bool Statistics = false);
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///< Creates a linear ring buffer.
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///< The buffer will be able to hold at most Size bytes of data, and will
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///< be guaranteed to return at least Margin bytes in one consecutive block.
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virtual ~cRingBufferLinear();
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virtual int Available(void);
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virtual void Clear(void);
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///< Immediately clears the ring buffer.
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int Put(const uchar *Data, int Count);
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///< Puts at most Count bytes of Data into the ring buffer.
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///< \return Returns the number of bytes actually stored.
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uchar *Get(int &Count);
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///< Gets data from the ring buffer.
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///< The data will remain in the buffer until a call to Del() deletes it.
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///< \return Returns a pointer to the data, and stores the number of bytes
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///< actually retrieved in Count. If the returned pointer is NULL, Count has no meaning.
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void Del(int Count);
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///< Deletes at most Count bytes from the ring buffer.
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///< Count must be less or equal to the number that was returned by a previous
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///< call to Get().
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};
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enum eFrameType { ftUnknown, ftVideo, ftAudio, ftDolby };
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class cFrame {
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friend class cRingBufferFrame;
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private:
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cFrame *next;
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uchar *data;
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int count;
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eFrameType type;
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int index;
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public:
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cFrame(const uchar *Data, int Count, eFrameType = ftUnknown, int Index = -1);
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///< Creates a new cFrame object.
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///< If Count is negative, the cFrame object will take ownership of the given
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///< Data. Otherwise it will allocate Count bytes of memory and copy Data.
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~cFrame();
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uchar *Data(void) const { return data; }
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int Count(void) const { return count; }
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eFrameType Type(void) const { return type; }
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int Index(void) const { return index; }
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};
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class cRingBufferFrame : public cRingBuffer {
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private:
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cFrame *head;
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int currentFill;
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void Delete(cFrame *Frame);
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public:
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cRingBufferFrame(int Size, bool Statistics = false);
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virtual ~cRingBufferFrame();
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virtual int Available(void);
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virtual void Clear(void);
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// Immediately clears the ring buffer.
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bool Put(cFrame *Frame);
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// Puts the Frame into the ring buffer.
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// Returns true if this was possible.
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cFrame *Get(void);
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// Gets the next frame from the ring buffer.
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// The actual data still remains in the buffer until Drop() is called.
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void Drop(cFrame *Frame);
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// Drops the Frame that has just been fetched with Get().
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};
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#endif // __RINGBUFFER_H
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