public static bool Start(string device, IEmulationElement loggingParent)
{
#if !PLATFORM_LINUX
throw new RecoverableException("Video capture is supported on Linux only!");
#else
// stop any previous capturer
Stop();
VideoCapturer.loggingParent = loggingParent;
loggingParent.Log(LogLevel.Debug, "Opening device: {0}...", device);
fd = LibCWrapper.Open(device, O_RDWR);
if (fd == -1)
{
loggingParent.Log(LogLevel.Error, "Couldn't open device: {0}", device);
return(false);
}
if (!CheckImageFormat())
{
loggingParent.Log(LogLevel.Error, "Device does not support JPEG output: {0}", device);
LibCWrapper.Close(fd);
return(false);
}
started = true;
return(RequestBuffer());
#endif
}
public static void Trace(this IEmulationElement e, LogLevel type, string message = "",
[CallerLineNumber] int lineNumber = 0,
[CallerMemberName] string caller = null,
[CallerFilePath] string fileName = null)
{
e.Log(type, String.Format("{0} in {1} ({2}@{3}).", message, caller, Path.GetFileName(fileName), lineNumber));
}
public static bool TryCreateFrameOrLogWarning(IEmulationElement source, byte[] data, out EthernetFrame frame, bool addCrc)
{
if (EthernetFrame.TryCreateEthernetFrame(data, addCrc, out frame))
{
return(true);
}
source.Log(LogLevel.Warning, "Insufficient data to create an ethernet frame, expected {0} bytes but got {1} bytes.",
EthernetFrame.MinFrameSizeWithoutCRC + (addCrc ? 0 : EthernetFrame.CRCLength), data.Length);
return(false);
}
public static long HzToTicksSafe(long hz, IEmulationElement sender)
{
var result = (long)Math.Round(HzToTicks(hz));
if(result == 0)
{
result = 1;
}
var againInHz = TicksToHz(result);
if(Math.Abs(againInHz - hz) / hz > MaximalDifference)
{
sender.Log(LogLevel.Warning, "Significant difference between desired and actual frequency: {0}Hz={1}Hz vs {2}Hz={3}Hz,",
Misc.NormalizeDecimal(hz), Misc.NormalizeDecimal(againInHz), hz, againInHz);
}
return result;
}
public static long HzToTicksSafe(long hz, IEmulationElement sender)
{
var result = (long)Math.Round(HzToTicks(hz));
if (result == 0)
{
result = 1;
}
var againInHz = TicksToHz(result);
if (Math.Abs(againInHz - hz) / hz > MaximalDifference)
{
sender.Log(LogLevel.Warning, "Significant difference between desired and actual frequency: {0}Hz={1}Hz vs {2}Hz={3}Hz,",
Misc.NormalizeDecimal(hz), Misc.NormalizeDecimal(againInHz), hz, againInHz);
}
return(result);
}