private static int TutorialDeveloperThread1()
{
try
{
OpenPose.Log("Starting OpenPose demo...", Priority.High);
var timeBegin = new Stopwatch();
timeBegin.Start();
// ------------------------- INITIALIZATION -------------------------
// Step 1 - Set logging level
// - 0 will output all the logging messages
// - 255 will output nothing
OpenPose.Check(0 <= Flags.LoggingLevel && Flags.LoggingLevel <= 255, "Wrong logging_level value.");
ConfigureLog.PriorityThreshold = (Priority)Flags.LoggingLevel;
// Step 2 - Read GFlags (user defined configuration)
// cameraSize
var cameraSize = OpenPose.FlagsToPoint(Flags.CameraResolution, "-1x-1");
// outputSize
var outputSize = OpenPose.FlagsToPoint(Flags.OutputResolution, "-1x-1");
// producerType
var tie = OpenPose.FlagsToProducer(Flags.ImageDir, Flags.Video, Flags.IpCamera, Flags.Camera, Flags.FlirCamera, Flags.FlirCameraIndex);
var producerType = tie.Item1;
var producerString = tie.Item2;
var displayProducerFpsMode = Flags.ProcessRealTime ? ProducerFpsMode.OriginalFps : ProducerFpsMode.RetrievalFps;
using (var producerSharedPtr = OpenPose.CreateProducer(producerType,
cameraSize,
producerString,
Flags.CameraParameterPath,
Flags.FrameUndistort,
Flags.Views3D))
{
producerSharedPtr.Get().SetProducerFpsMode(displayProducerFpsMode);
OpenPose.Log("", Priority.Low);
// Step 3 - Setting producer
//var videoSeekSharedPtr = std::make_shared<std::pair<std::atomic<bool>, std::atomic<int>>>();
//videoSeekSharedPtr->first = false;
//videoSeekSharedPtr->second = 0;
// Step 4 - Setting thread workers && manager
// Note:
// nativeDebugging may occur crash
using (var threadManager = new ThreadManager <Datum>())
{
// Step 5 - Initializing the worker classes
// Frames producer (e.g., video, webcam, ...)
using (var datumProducer = new StdSharedPtr <DatumProducer <Datum> >(new DatumProducer <Datum>(producerSharedPtr)))
using (var wDatumProducer = new StdSharedPtr <WDatumProducer <Datum> >(new WDatumProducer <Datum>(datumProducer)))
{
// GUI (Display)
using (var gui = new StdSharedPtr <Gui>(new Gui(outputSize, Flags.FullScreen, threadManager.GetIsRunningSharedPtr())))
using (var wGui = new StdSharedPtr <WGui <Datum> >(new WGui <Datum>(gui)))
{
// ------------------------- CONFIGURING THREADING -------------------------
// In this simple multi-thread example, we will do the following:
// 3 (virtual) queues: 0, 1, 2
// 1 real queue: 1. The first and last queue ids (in this case 0 and 2) are not actual queues, but the
// beginning and end of the processing sequence
// 2 threads: 0, 1
// wDatumProducer will generate frames (there is no real queue 0) and push them on queue 1
// wGui will pop frames from queue 1 and process them (there is no real queue 2)
var threadId = 0UL;
var queueIn = 0UL;
var queueOut = 1UL;
threadManager.Add(threadId++, wDatumProducer, queueIn++, queueOut++); // Thread 0, queues 0 -> 1
threadManager.Add(threadId++, wGui, queueIn++, queueOut++); // Thread 1, queues 1 -> 2
// Equivalent single-thread version (option a)
// const auto threadId = 0ull;
// auto queueIn = 0ull;
// auto queueOut = 1ull;
// threadManager.add(threadId, wDatumProducer, queueIn++, queueOut++); // Thread 0, queues 0 -> 1
// threadManager.add(threadId, wGui, queueIn++, queueOut++); // Thread 0, queues 1 -> 2
// Equivalent single-thread version (option b)
// const auto threadId = 0ull;
// const auto queueIn = 0ull;
// const auto queueOut = 1ull;
// threadManager.add(threadId, {wDatumProducer, wGui}, queueIn, queueOut); // Thread 0, queues 0 -> 1
// ------------------------- STARTING AND STOPPING THREADING -------------------------
OpenPose.Log("Starting thread(s)...", Priority.High);
// Two different ways of running the program on multithread environment
// Option a) Using the main thread (this thread) for processing (it saves 1 thread, recommended)
threadManager.Exec();
// Option b) Giving to the user the control of this thread
// // VERY IMPORTANT NOTE: if OpenCV is compiled with Qt support, this option will not work. Qt needs the main
// // thread to plot visual results, so the final GUI (which uses OpenCV) would return an exception similar to:
// // `QMetaMethod::invoke: Unable to invoke methods with return values in queued connections`
// // Start threads
// threadManager.start();
// // Keep program alive while running threads. Here the user could perform any other desired function
// while (threadManager.isRunning())
// std::this_thread::sleep_for(std::chrono::milliseconds{33});
// // Stop and join threads
// op::log("Stopping thread(s)", op::Priority::High);
// threadManager.stop();
}
}
}
}
// ------------------------- CLOSING -------------------------
// Measuring total time
timeBegin.Stop();
var totalTimeSec = timeBegin.ElapsedMilliseconds / 1000d;
var message = $"OpenPose demo successfully finished. Total time: {totalTimeSec} seconds.";
OpenPose.Log(message, Priority.High);
// Return successful message
return(0);
}
catch (Exception e)
{
OpenPose.Error(e.Message, -1, nameof(TutorialDeveloperThread1));
return(-1);
}
}