| // 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) 2019 Intel Corporation | |
| namespace cv { | |
| namespace gapi { | |
| namespace wip { | |
| struct Data; // forward-declaration of Data to avoid circular dependencies | |
| /** | |
| * @brief Abstract streaming pipeline source. | |
| * | |
| * Implement this interface if you want customize the way how data is | |
| * streaming into GStreamingCompiled. | |
| * | |
| * Objects implementing this interface can be passed to | |
| * GStreamingCompiled using setSource() with cv::gin(). Regular | |
| * compiled graphs (GCompiled) don't support input objects of this | |
| * type. | |
| * | |
| * Default cv::VideoCapture-based implementation is available, see | |
| * cv::gapi::wip::GCaptureSource. | |
| * | |
| * @note stream sources are passed to G-API via shared pointers, so | |
| * please use ptr() when passing a IStreamSource implementation to | |
| * cv::gin(). | |
| */ | |
| class IStreamSource: public std::enable_shared_from_this<IStreamSource> | |
| { | |
| public: | |
| using Ptr = std::shared_ptr<IStreamSource>; | |
| Ptr ptr() { return shared_from_this(); } | |
| virtual bool pull(Data &data) = 0; | |
| virtual GMetaArg descr_of() const = 0; | |
| virtual void halt() { | |
| // Do nothing by default to maintain compatibility with the existing sources... | |
| // In fact needs to be decorated atop of the child classes to maintain the behavior | |
| // FIXME: Make it mandatory in OpenCV 5.0 | |
| }; | |
| virtual ~IStreamSource() = default; | |
| }; | |
| template<class T, class... Args> | |
| IStreamSource::Ptr inline make_src(Args&&... args) | |
| { | |
| static_assert(std::is_base_of<IStreamSource, T>::value, | |
| "T must implement the cv::gapi::IStreamSource interface!"); | |
| auto src_ptr = std::make_shared<T>(std::forward<Args>(args)...); | |
| return src_ptr->ptr(); | |
| } | |
| } // namespace wip | |
| } // namespace gapi | |
| } // namespace cv | |