circularbufferposition.cpp

来自「C++封装的视频采集代码」· C++ 代码 · 共 46 行

#include "CircularBufferPosition.h"

namespace oxsemi
{
    namespace circular_buffer
    {
        CircularBufferPosition::CircularBufferPosition(
            unsigned long maxOffset,
            unsigned long offset,
            unsigned long loopCount) :
            maxOffset_(maxOffset),
            offset_(offset),
            loopCount_(loopCount)
        {
        }

        CircularBufferPosition CircularBufferPosition::DecodeFromBuffer(const unsigned char* buffer)
        {
            unsigned long maxOffset = *reinterpret_cast<const unsigned long*>(buffer);
            buffer += sizeof(unsigned long);
            unsigned long offset = *reinterpret_cast<const unsigned long*>(buffer);
            buffer += sizeof(unsigned long);
            unsigned long loopCount = *reinterpret_cast<const unsigned long*>(buffer);

            return CircularBufferPosition(maxOffset, offset, loopCount);
        }

        void CircularBufferPosition::EncodeToBuffer(unsigned char* buffer) const
        {
            *reinterpret_cast<unsigned long*>(buffer) = maxOffset_;
            buffer += sizeof(unsigned long);
            *reinterpret_cast<unsigned long*>(buffer) = offset_;
            buffer += sizeof(unsigned long);
            *reinterpret_cast<unsigned long*>(buffer) = loopCount_;
        }

        void CircularBufferPosition::Zeroise(unsigned long maxOffset)
        {
            maxOffset_ = maxOffset;
            offset_ = 0;
            loopCount_ = 0;
        }
    }
}