Merge pull request #20738 from sivanov-work:merge_master_vpl_dev_select

G-API: oneVPL - Implement IDeviceSelector & default cfg_param-based selector

* Initial commit

* Add MACRO undef

* Change IDeviceSelector, Change Inf sample for choose external device

* Fix compilation

* Address some comments

* Fix compilation

* Add missing header

* Add EXPORT to dev selector

* Add guard

* Remove enum type attr

* Fix compilation without VPL

* Add HAVE_INFER guard in sample

* Remove unusable include from tests

* Remove unusable include from sample

* Remove cl_d3d11 header from unit test

modules/gapi/include/opencv2/gapi/streaming/onevpl/device_selector_interface.hpp

@@ -0,0 +1,102 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+//
+// Copyright (C) 2021 Intel Corporation
+
+#ifndef GAPI_STREAMING_ONEVPL_DEVICE_SELECTOR_INTERFACE_HPP
+#define GAPI_STREAMING_ONEVPL_DEVICE_SELECTOR_INTERFACE_HPP
+
+#include <limits>
+#include <map>
+#include <string>
+#include <vector>
+
+#include "opencv2/gapi/own/exports.hpp" // GAPI_EXPORTS
+
+namespace cv {
+namespace gapi {
+namespace wip {
+namespace onevpl {
+
+enum class AccelType : uint8_t {
+    HOST,
+    DX11,
+
+    LAST_VALUE = std::numeric_limits<uint8_t>::max()
+};
+
+GAPI_EXPORTS const char* to_cstring(AccelType type);
+
+struct IDeviceSelector;
+struct GAPI_EXPORTS Device {
+    friend struct IDeviceSelector;
+    using Ptr = void*;
+
+    ~Device();
+    const std::string& get_name() const;
+    Ptr get_ptr() const;
+    AccelType get_type() const;
+private:
+    Device(Ptr device_ptr, const std::string& device_name,
+           AccelType device_type);
+
+    std::string name;
+    Ptr ptr;
+    AccelType type;
+};
+
+struct GAPI_EXPORTS Context {
+    friend struct IDeviceSelector;
+    using Ptr = void*;
+
+    ~Context();
+    Ptr get_ptr() const;
+    AccelType get_type() const;
+private:
+    Context(Ptr ctx_ptr, AccelType ctx_type);
+    Ptr ptr;
+    AccelType type;
+};
+
+struct GAPI_EXPORTS IDeviceSelector {
+    using Ptr = std::shared_ptr<IDeviceSelector>;
+
+    struct GAPI_EXPORTS Score {
+        friend struct IDeviceSelector;
+        using Type = int16_t;
+        static constexpr Type MaxActivePriority = std::numeric_limits<Type>::max();
+        static constexpr Type MinActivePriority = 0;
+        static constexpr Type MaxPassivePriority = MinActivePriority - 1;
+        static constexpr Type MinPassivePriority = std::numeric_limits<Type>::min();
+
+        Score(Type val);
+        ~Score();
+
+        operator Type () const;
+        Type get() const;
+        friend bool operator< (Score lhs, Score rhs) {
+            return lhs.get() < rhs.get();
+        }
+    private:
+        Type value;
+    };
+
+    using DeviceScoreTable = std::map<Score, Device>;
+    using DeviceContexts = std::vector<Context>;
+
+    virtual ~IDeviceSelector();
+    virtual DeviceScoreTable select_devices() const = 0;
+    virtual DeviceContexts select_context() = 0;
+protected:
+    template<typename Entity, typename ...Args>
+    static Entity create(Args &&...args) {
+        return Entity(std::forward<Args>(args)...);
+    }
+};
+} // namespace onevpl
+} // namespace wip
+} // namespace gapi
+} // namespace cv
+
+#endif // GAPI_STREAMING_ONEVPL_DEVICE_SELECTOR_INTERFACE_HPP

modules/gapi/include/opencv2/gapi/streaming/onevpl/source.hpp

@@ -12,6 +12,7 @@
 #include <opencv2/gapi/streaming/source.hpp>
 #include <opencv2/gapi/streaming/onevpl/cfg_params.hpp>
 #include <opencv2/gapi/streaming/onevpl/data_provider_interface.hpp>
+#include <opencv2/gapi/streaming/onevpl/device_selector_interface.hpp>
 
 namespace cv {
 namespace gapi {
@@ -38,8 +39,31 @@ public:
 
     GSource(const std::string& filePath,
             const CfgParams& cfg_params = CfgParams{});
+
+    GSource(const std::string& filePath,
+            const CfgParams& cfg_params,
+            const std::string& device_id,
+            void* accel_device_ptr,
+            void* accel_ctx_ptr);
+
+    GSource(const std::string& filePath,
+            const CfgParams& cfg_params,
+            std::shared_ptr<IDeviceSelector> selector);
+
+
     GSource(std::shared_ptr<IDataProvider> source,
             const CfgParams& cfg_params = CfgParams{});
+
+    GSource(std::shared_ptr<IDataProvider> source,
+            const CfgParams& cfg_params,
+            const std::string& device_id,
+            void* accel_device_ptr,
+            void* accel_ctx_ptr);
+
+    GSource(std::shared_ptr<IDataProvider> source,
+            const CfgParams& cfg_params,
+            std::shared_ptr<IDeviceSelector> selector);
+
     ~GSource() override;
 
     bool pull(cv::gapi::wip::Data& data) override;