public float[] GetData(int channel, DateTime timeBegin, int secLen)
{
int channelNum = listChannel.Count;
if (channelNum <= 0)
{
return(null);
}
if (timeBegin > this.EndTime)
{
return(null);
}
if (timeBegin.AddSeconds(secLen) < this.BeginTime)
{
return(null);
}
long startSec = (long)((timeBegin - this.BeginTime).TotalSeconds);
int sampleRate = listChannel[0].SampleRate;
int bytesPerSec = channelNum * sampleRate;
long secTotal = (long)((this.Length - 512 * 2) * 1f / (channelNum * sampleRate)); //去掉最后一秒的数据
if (startSec + secLen > secTotal)
{
secLen = (int)(secTotal - startSec);
}
long startRd = (this.Offset + 512 * 2 + startSec * sampleRate * channelNum - 511) / 512L * 512;
long rdOffset = (this.Offset + 512 * 2 + startSec * sampleRate * channelNum - startRd);
long endRd = (this.Offset + 512 * 2 + sampleRate * (startSec + secLen) * channelNum + 511) / 512L * 512;
disk.Position = startRd;
byte[] adData = new byte[endRd - startRd];
float[] rdVal = new float[sampleRate * secLen];
int length = disk.Read(adData, 0, adData.Length);
for (int i = 0; i < sampleRate * secLen; i++)
{
rdVal[i] = adData[i * channelNum + channel + rdOffset];
}
return(rdVal);
}
public RecordControl(DiskUtil disk)
{
this.IsValid = false;
disk.Read(data, 0, data.Length);
this.Tag = Encoding.ASCII.GetString(data, 0, 4);
if (this.Tag != "ctrl")
{
return;
}
this.IsValid = true;
this.TotalSector = BitConverter.ToInt32(data, 4);
this.UsedSector = BitConverter.ToInt32(data, 8);
}
public RecordDevice(DiskUtil disk)
{
this.IsValid = false;
disk.Read(sectorData, 0, 512);
this.Tag = Encoding.ASCII.GetString(sectorData, 0, 4);
if (this.Tag != " dev")
{
return;
}
this.IsValid = true;
this.Time = new DateTime(sectorData[4] + 2000, sectorData[5], sectorData[6], sectorData[7], sectorData[8], sectorData[9]);
this.devInfo = new DeviceInfo(sectorData, 10);
this.UsedSector = BitConverter.ToInt32(sectorData, 138);
this.UsedRate = BitConverter.ToInt16(sectorData, 142);
this.Overflow = BitConverter.ToInt32(sectorData, 144);
}
public RecordFile(DiskUtil disk, long offset, int index)
{
this.disk = disk;
this.Offset = offset;
disk.Position = offset;
device = new RecordDevice(disk);
if (device.IsValid == false)
{
return;
}
disk.Read(dataChannel, 0, 512);
string tag = ASCIIEncoding.ASCII.GetString(dataChannel, 0, 4);
if (tag != " chn")
{
return;
}
int channelNum = dataChannel[4];
eventWaits = new EventWaitHandle[channelNum];
for (int i = 0; i < channelNum; i++)
{
AutoResetEvent autoEvent = new AutoResetEvent(false);
SignalChannel info = new SignalChannel(this, autoEvent, dataChannel, 5 + 128 * i);
eventWaits[i] = autoEvent;
listChannel.Add(info);
}
this.FileIndex = index + 1;
}
