private IEnumerator <ITask> RefreshCameraList(WebCamState state, Port <EmptyValue> completionPort)
{
var devicePort = EnumDevices();
yield return(Arbiter.Receive(false, devicePort, list => state.Cameras = list));
completionPort.Post(EmptyValue.SharedInstance);
}
public void ReplaceHandler(mdwebcam.Replace replace)
{
_state = replace.Body;
if (_streamPort != null)
{
_streamPort.Post(new Shutdown());
}
try
{
_streamPort = mdwebcam.ReadStream.Create(_state.CaptureFile, Environment.TaskQueue);
}
catch (Exception e)
{
LogError("Unable to open stream file: " + e.Message);
}
replace.ResponsePort.Post(DefaultReplaceResponseType.Instance);
SendNotification(_subMgrPort, replace);
}
/// <summary>
/// Complete second phase startup for this service
/// </summary>
protected override void Start()
{
_fwdPort = ServiceForwarder <WebCamServiceOperations>(ServiceInfo.Service);
_altFwdPort = ServiceForwarder <webcam.WebCamOperations>(AlternateContractServiceInfo[0].Service);
_utilitiesPort = DsspHttpUtilitiesService.Create(Environment);
_prefix = new Uri(ServiceInfo.Service).AbsolutePath;
_alternatePrefix = new Uri(AlternateContractServiceInfo[0].Service).AbsolutePath;
if (_state == null)
{
_state = new WebCamState();
}
base.ActivateDsspOperationHandlers();
if (_state.FramesOnDemand)
{
_framesOnDemand = true;
Activate(Arbiter.ReceiveWithIterator(true, _framePort, OnDemandFrameHandler));
}
else
{
base.MainPortInterleave.CombineWith(
Arbiter.Interleave(
new TeardownReceiverGroup(),
new ExclusiveReceiverGroup
(
Arbiter.Receive(true, _framePort, FrameHandler)
),
new ConcurrentReceiverGroup()
)
);
}
StartPipeServer();
SpawnIterator(_state, GetInitialState);
}
public void ReplaceHandler(Replace replace)
{
_state = replace.Body;
replace.ResponsePort.Post(DefaultReplaceResponseType.Instance);
#if !URT_MINCLR
SendNotification(_submgrPort, replace);
if (_streamPort != null)
{
_streamPort.Post(new Shutdown());
_streamPort = null;
}
if (!string.IsNullOrEmpty(_state.CaptureFile))
{
_streamPort = SaveStream.Create(_state.CaptureFile, _state.Quality, _queue);
}
#else
SendNotification(replace);
#endif
}
IEnumerator <ITask> GetInitialState(WebCamState initialState)
{
bool deviceSelected = false;
try
{
WebCamState state = new WebCamState();
state.CaptureFile = initialState.CaptureFile;
state.Quality = initialState.Quality;
state.FramesOnDemand = initialState.FramesOnDemand;
#if !URT_MINCLR
yield return(InitializeInternalService());
#endif
Port <EmptyValue> completion = new Port <EmptyValue>();
SpawnIterator(state, completion, RefreshCameraList);
yield return(Arbiter.Receive(false, completion, EmptyHandler));
state.Image = null;
Replace replace = new Replace();
replace.Body = state;
_fwdPort.Post(replace);
yield return(Arbiter.Choice(
replace.ResponsePort,
delegate(DefaultReplaceResponseType success) { },
delegate(Fault fault)
{
LogError(null, "Unable to set camera list", fault);
}
));
int deviceIndex;
if (initialState.Selected != null &&
(!string.IsNullOrEmpty(initialState.Selected.DevicePath) ||
!string.IsNullOrEmpty(initialState.Selected.FriendlyName)))
{
deviceIndex = -1;
}
else
{
deviceIndex = 0;
}
bool gotDevice = false;
while (deviceIndex < state.Cameras.Count && !gotDevice)
{
UpdateDeviceRequest request = new UpdateDeviceRequest();
if (deviceIndex < 0)
{
request.Selected = initialState.Selected;
request.Selected.InUse = false;
}
else if (deviceIndex < state.Cameras.Count)
{
request.Selected = state.Cameras[deviceIndex];
}
if (!request.Selected.InUse)
{
UpdateDevice update = new UpdateDevice();
update.Body = request;
_fwdPort.Post(update);
yield return(Arbiter.Choice(
update.ResponsePort,
success => gotDevice = true,
fault => LogInfo("Unable to select camera: " + deviceIndex + ": " + fault)
));
}
else
{
LogInfo("Not trying camera (InUse = true): " + deviceIndex);
}
deviceIndex++;
}
if (!gotDevice)
{
LogError("Unable to select device");
yield break;
}
deviceSelected = true;
if (initialState.Selected == null ||
initialState.Selected.Format == null)
{
yield break;
}
UpdateFormat updateFormat = new UpdateFormat();
updateFormat.Body = initialState.Selected.Format;
_fwdPort.Post(updateFormat);
yield return(Arbiter.Choice(
updateFormat.ResponsePort,
delegate(DefaultUpdateResponseType success) { },
delegate(Fault fault)
{
LogError(null, "Unable to select format", fault);
}
));
}
finally
{
if (deviceSelected)
{
DirectoryInsert();
}
else
{
LogWarning(LogGroups.Console, "Dropping webcam service, no cameras found");
_fwdPort.Post(new DsspDefaultDrop());
}
}
}