| // 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) 2020 Intel Corporation | |
| // TODO GAPI_EXPORTS or so | |
| namespace cv | |
| { | |
| // Forward declaration; GNode and GOrigin are an internal | |
| // (user-inaccessible) classes. | |
| class GNode; | |
| struct GOrigin; | |
| /** \addtogroup gapi_data_objects | |
| * @{ | |
| */ | |
| /** | |
| * @brief GFrame class represents an image or media frame in the graph. | |
| * | |
| * GFrame doesn't store any data itself, instead it describes a | |
| * functional relationship between operations consuming and producing | |
| * GFrame objects. | |
| * | |
| * GFrame is introduced to handle various media formats (e.g., NV12 or | |
| * I420) under the same type. Various image formats may differ in the | |
| * number of planes (e.g. two for NV12, three for I420) and the pixel | |
| * layout inside. GFrame type allows to handle these media formats in | |
| * the graph uniformly -- the graph structure will not change if the | |
| * media format changes, e.g. a different camera or decoder is used | |
| * with the same graph. G-API provides a number of operations which | |
| * operate directly on GFrame, like `infer<>()` or | |
| * renderFrame(); these operations are expected to handle different | |
| * media formats inside. There is also a number of accessor | |
| * operations like BGR(), Y(), UV() -- these operations provide | |
| * access to frame's data in the familiar cv::GMat form, which can be | |
| * used with the majority of the existing G-API operations. These | |
| * accessor functions may perform color space conversion on the fly if | |
| * the image format of the GFrame they are applied to differs from the | |
| * operation's semantic (e.g. the BGR() accessor is called on an NV12 | |
| * image frame). | |
| * | |
| * GFrame is a virtual counterpart of cv::MediaFrame. | |
| * | |
| * @sa cv::MediaFrame, cv::GFrameDesc, BGR(), Y(), UV(), infer<>(). | |
| */ | |
| class GAPI_EXPORTS_W_SIMPLE GFrame | |
| { | |
| public: | |
| /** | |
| * @brief Constructs an empty GFrame | |
| * | |
| * Normally, empty G-API data objects denote a starting point of | |
| * the graph. When an empty GFrame is assigned to a result of some | |
| * operation, it obtains a functional link to this operation (and | |
| * is not empty anymore). | |
| */ | |
| GAPI_WRAP GFrame(); // Empty constructor | |
| /// @private | |
| GFrame(const GNode &n, std::size_t out); // Operation result constructor | |
| /// @private | |
| GOrigin& priv(); // Internal use only | |
| /// @private | |
| const GOrigin& priv() const; // Internal use only | |
| private: | |
| std::shared_ptr<GOrigin> m_priv; | |
| }; | |
| /** @} */ | |
| enum class MediaFormat: int | |
| { | |
| BGR = 0, | |
| NV12, | |
| GRAY, | |
| }; | |
| /** | |
| * \addtogroup gapi_meta_args | |
| * @{ | |
| */ | |
| struct GAPI_EXPORTS GFrameDesc | |
| { | |
| MediaFormat fmt; | |
| cv::Size size; | |
| bool operator== (const GFrameDesc &) const; | |
| }; | |
| static inline GFrameDesc empty_gframe_desc() { return GFrameDesc{}; } | |
| /** @} */ | |
| class MediaFrame; | |
| GAPI_EXPORTS GFrameDesc descr_of(const MediaFrame &frame); | |
| GAPI_EXPORTS std::ostream& operator<<(std::ostream& os, const cv::GFrameDesc &desc); | |
| } // namespace cv | |