64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
/**********************************************************************
|
|
|
|
Audacity: A Digital Audio Editor
|
|
|
|
RingBuffer.h
|
|
|
|
Dominic Mazzoni
|
|
|
|
*******************************************************************/
|
|
|
|
#ifndef __AUDACITY_RING_BUFFER__
|
|
#define __AUDACITY_RING_BUFFER__
|
|
|
|
#include "SampleFormat.h"
|
|
#include <atomic>
|
|
|
|
class RingBuffer {
|
|
public:
|
|
RingBuffer(sampleFormat format, size_t size);
|
|
~RingBuffer();
|
|
|
|
//
|
|
// For the writer only:
|
|
//
|
|
|
|
size_t AvailForPut();
|
|
//! Does not apply dithering
|
|
size_t Put(samplePtr buffer, sampleFormat format, size_t samples,
|
|
// optional number of trailing zeroes
|
|
size_t padding = 0);
|
|
size_t Clear(sampleFormat format, size_t samples);
|
|
|
|
//
|
|
// For the reader only:
|
|
//
|
|
|
|
size_t AvailForGet();
|
|
//! Does not apply dithering
|
|
size_t Get(samplePtr buffer, sampleFormat format, size_t samples);
|
|
size_t Discard(size_t samples);
|
|
|
|
private:
|
|
size_t Filled( size_t start, size_t end );
|
|
size_t Free( size_t start, size_t end );
|
|
|
|
enum : size_t { CacheLine = 64 };
|
|
/*
|
|
// We will do this in C++17 instead:
|
|
static constexpr size_t CacheLine =
|
|
std::hardware_destructive_interference_size;
|
|
*/
|
|
|
|
// Align the two atomics to avoid false sharing
|
|
alignas(CacheLine) std::atomic<size_t> mStart { 0 };
|
|
alignas(CacheLine) std::atomic<size_t> mEnd{ 0 };
|
|
|
|
const size_t mBufferSize;
|
|
|
|
sampleFormat mFormat;
|
|
SampleBuffer mBuffer;
|
|
};
|
|
|
|
#endif /* __AUDACITY_RING_BUFFER__ */
|