public static ArraySegment <int> CopyToArray(this ArraySegment <int> seg, SyncBufManager bufMgr)
{
RecycleIntBuf buf = new RecycleIntBuf(seg.Count, bufMgr);
if (seg.Array == null)
{
return(new ArraySegment <int>());
}
var result = bufMgr.TakeIntBuf(seg.Count);
Array.Copy(seg.Array, seg.Offset, result, 0, seg.Count);
return(new ArraySegment <int>(result, 0, seg.Count));
}
public static ArraySegment <int> FastConvertFrom(ArraySegment <byte> data, SyncBufManager mgr)
{
if (data.Array == null)
{
return(Empty);
}
var startInd = data.Offset;
var count = data.Count;
var result = mgr.TakeIntBuf(count / 3);
unsafe
{
fixed(byte *arr = data.Array)
{
fixed(int *r = result)
{
int *rt = r;
for (int i = startInd; i < count; i = i + 3)
{
byte *tmp = (byte *)rt;
* tmp = arr[i + 2];
tmp++;
*tmp = arr[i + 1];
tmp++;
*tmp = arr[i];
tmp++;
*tmp = 0;
if ((arr[i] & 0x80) != 0)
{
*rt -= flipVal;
}
rt++;
}
}
}
}
return(new ArraySegment <int>(result, 0, count / 3));
}
public static ArraySegment <int> ConvertFrom(ArraySegment <byte> data, SyncBufManager mgr)
{
var arr = data.Array;
if (arr == null)
{
return(Empty);
}
var ind = data.Offset;
var count = data.Count;
var buf = mgr.TakeIntBuf(count / 3);
for (int i = 0; i < buf.Length; i++)
{
buf[i] = (arr[ind] << 16) + (arr[ind + 1] << 8) + arr[ind + 2];
if ((arr[ind] & 0x80) != 0)
{
buf[i] -= flipVal;
}
ind += 3;
}
return(new ArraySegment <int>(buf, 0, count / 3));
}
public RecycleIntBuf(int size, SyncBufManager mgr)
{
_size = size;
_buf = mgr.TakeIntBuf(size);
_mgr = mgr;
}
public RecycleBuffer(int size, SyncBufManager mgr)
{
_size = size;
_buf = mgr.TakeBuffer(size);
_mgr = mgr;
}
/// <summary>
/// 把ADS1299的24位采样数据转换为电压值，电压单位伏特
/// </summary>
/// <param name="data"></param>
/// <param name="mgr"></param>
/// <returns></returns>
public static ArraySegment <int> ConvertFromPlatform(ArraySegment <byte> data, SyncBufManager mgr)
{
if (Environment.OSVersion.Platform == PlatformID.Unix)
{
return(FastConvertFrom(data, mgr));
}
else
{
return(ConvertFrom(data, mgr));
}
}
