86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
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// 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) 2020-2021 Intel Corporation
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#ifndef OPENCV_GAPI_GSTREAMING_DESYNC_HPP
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#define OPENCV_GAPI_GSTREAMING_DESYNC_HPP
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#include <tuple>
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#include <opencv2/gapi/util/util.hpp>
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#include <opencv2/gapi/gtype_traits.hpp>
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#include <opencv2/gapi/garg.hpp>
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#include <opencv2/gapi/gcall.hpp>
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#include <opencv2/gapi/gkernel.hpp>
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namespace cv {
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namespace gapi {
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namespace streaming {
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namespace detail {
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struct GDesync {
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static const char *id() {
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return "org.opencv.streaming.desync";
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}
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// An universal yield for desync.
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// Yields output objects according to the input Types...
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// Reuses gkernel machinery.
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// FIXME: This function can be generic and declared in gkernel.hpp
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// (it is there already, but a part of GKernelType[M]
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template<typename... R, int... IIs>
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static std::tuple<R...> yield(cv::GCall &call, cv::detail::Seq<IIs...>) {
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return std::make_tuple(cv::detail::Yield<R>::yield(call, IIs)...);
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}
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};
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template<typename G>
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G desync(const G &g) {
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cv::GKernel k{
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GDesync::id() // kernel id
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, "" // kernel tag
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, [](const GMetaArgs &a, const GArgs &) {return a;} // outMeta callback
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, {cv::detail::GTypeTraits<G>::shape} // output Shape
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, {cv::detail::GTypeTraits<G>::op_kind} // input data kinds
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, {cv::detail::GObtainCtor<G>::get()} // output template ctors
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};
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cv::GCall call(std::move(k));
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call.pass(g);
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return std::get<0>(GDesync::yield<G>(call, cv::detail::MkSeq<1>::type()));
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}
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} // namespace detail
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/**
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* @brief Starts a desynchronized branch in the graph.
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*
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* This operation takes a single G-API data object and returns a
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* graph-level "duplicate" of this object.
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*
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* Operations which use this data object can be desynchronized
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* from the rest of the graph.
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*
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* This operation has no effect when a GComputation is compiled with
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* regular cv::GComputation::compile(), since cv::GCompiled objects
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* always produce their full output vectors.
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*
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* This operation only makes sense when a GComputation is compiled in
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* straming mode with cv::GComputation::compileStreaming(). If this
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* operation is used and there are desynchronized outputs, the user
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* should use a special version of cv::GStreamingCompiled::pull()
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* which produces an array of cv::util::optional<> objects.
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*
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* @note This feature is highly experimental now and is currently
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* limited to a single GMat/GFrame argument only.
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*/
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GAPI_EXPORTS GMat desync(const GMat &g);
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GAPI_EXPORTS GFrame desync(const GFrame &f);
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} // namespace streaming
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} // namespace gapi
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} // namespace cv
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#endif // OPENCV_GAPI_GSTREAMING_DESYNC_HPP
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