// This file is part of OpenCV project.
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// It is subject to the license terms in the LICENSE file found in the top-level directory
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// of this distribution and at http://opencv.org/license.html.
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//
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// Copyright (C) 2019 Intel Corporation
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#ifndef OPENCV_GAPI_STREAMING_SOURCE_HPP
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#define OPENCV_GAPI_STREAMING_SOURCE_HPP
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#include <memory> // shared_ptr
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#include <type_traits> // is_base_of
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#include <opencv2/gapi/gmetaarg.hpp> // GMetaArg
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namespace cv {
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namespace gapi {
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namespace wip {
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struct Data; // "forward-declaration" of GRunArg
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/**
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* @brief Abstract streaming pipeline source.
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*
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* Implement this interface if you want customize the way how data is
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* streaming into GStreamingCompiled.
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*
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* Objects implementing this interface can be passed to
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* GStreamingCompiled using setSource() with cv::gin(). Regular
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* compiled graphs (GCompiled) don't support input objects of this
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* type.
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*
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* Default cv::VideoCapture-based implementation is available, see
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* cv::gapi::wip::GCaptureSource.
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*
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* @note stream sources are passed to G-API via shared pointers, so
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* please use ptr() when passing a IStreamSource implementation to
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* cv::gin().
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*/
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class IStreamSource: public std::enable_shared_from_this<IStreamSource>
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{
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public:
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using Ptr = std::shared_ptr<IStreamSource>;
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Ptr ptr() { return shared_from_this(); }
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virtual bool pull(Data &data) = 0;
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virtual GMetaArg descr_of() const = 0;
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virtual ~IStreamSource() = default;
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};
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template<class T, class... Args>
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IStreamSource::Ptr inline make_src(Args&&... args)
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{
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static_assert(std::is_base_of<IStreamSource, T>::value,
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"T must implement the cv::gapi::IStreamSource interface!");
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auto src_ptr = std::make_shared<T>(std::forward<Args>(args)...);
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return src_ptr->ptr();
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}
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} // namespace wip
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} // namespace gapi
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} // namespace cv
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#endif // OPENCV_GAPI_STREAMING_SOURCE_HPP
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