/// <summary>
/// 读取并写入数据的线程函数
/// </summary>
private void ThdFetchAndWriteData()
{
_recordBlockSize = (int)GetNearest2N((uint)(aitask.SampleRate / 20)) * aitask.Channels.Count;
//_recordBlockSize = (int)GetNearest2N((uint)(aitask.SampleRate / 20) * (uint)aitask.Channels.Count);
byte[] bufferToFile = new byte[_recordBlockSize * sizeof(int)];
int[] tempBuff = new int[_recordBlockSize];
int[] tempBuffDeq = new int[_recordBlockSize + aitask.Channels.Count];
int currentElementCount = 0;
long recordedCount = 0; //写入文件的点数（所有通道）
_localPreviewBuffer = new JYCommon.CircularBuffer <int>(Math.Max(_recordBlockSize, (int)aitask.SampleRate * aitask.Channels.Count)); //流盘预览缓冲区建立,1s每通道
_previewDataConvertBuffer = new int[_localPreviewBuffer.BufferSize * 2, aitask.Channels.Count];
while (TaskDone == false)
{
//To Add: 以下添加从缓冲区取数据并存入文件
JYCommon.WaitEvent waitEvent =
new JYCommon.WaitEvent(() => TaskDone || (aitask.AvailableSamples >= _recordBlockSize));
if (waitEvent.EnqueueWait(EventQueue, 100))
{
currentElementCount = aitask.AvailableSamples;
if (TaskDone == false && aitask.AvailableSamples >= _recordBlockSize)
{
_recordCnt += _recordBlockSize;
aitask.ReadRawData(ref tempBuff, 1000);
Buffer.BlockCopy(tempBuff, 0, bufferToFile, 0, _recordBlockSize * sizeof(int));
WriteDataToFile(bufferToFile, 0, _recordBlockSize * sizeof(int)); //写入文件
recordedCount += _recordBlockSize; //累加写入的点数
_recordedLength = (double)recordedCount / aitask.Channels.Count / aitask.SampleRate;
if (_previewBufferLock.WaitOne(1))
{
//如果放不下则，先清空，保证该缓冲区始终只有BlockSize那么多数据
if (_localPreviewBuffer.CurrentCapacity < _recordBlockSize)
{
_localPreviewBuffer.Dequeue(ref tempBuffDeq,
((_recordBlockSize - _localPreviewBuffer.CurrentCapacity) / aitask.Channels.Count + 1) * aitask.Channels.Count);
}
_localPreviewBuffer.Enqueue(tempBuff, _recordBlockSize);
_previewBufferLock.ReleaseMutex();
ActivateWaitEvents();
}
if (_recordedLength >= _recordLength)
{
TaskDone = true;
}
}
}
}
_recordDone = true;
}
