添加项目文件。

3rdparty/opencv/inc/opencv2/gapi/streaming/gstreamer/gstreamerpipeline.hpp

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+// 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 OPENCV_GAPI_STREAMING_GSTREAMER_GSTREAMERPIPELINE_HPP
+#define OPENCV_GAPI_STREAMING_GSTREAMER_GSTREAMERPIPELINE_HPP
+
+#include <opencv2/gapi/streaming/gstreamer/gstreamersource.hpp>
+#include <opencv2/gapi/own/exports.hpp>
+
+#include <string>
+#include <unordered_map>
+#include <memory>
+
+namespace cv {
+namespace gapi {
+namespace wip {
+namespace gst {
+
+class GAPI_EXPORTS GStreamerPipeline
+{
+public:
+    class Priv;
+
+    explicit GStreamerPipeline(const std::string& pipeline);
+    IStreamSource::Ptr getStreamingSource(const std::string& appsinkName,
+                                          const GStreamerSource::OutputType outputType =
+                                              GStreamerSource::OutputType::MAT);
+    virtual ~GStreamerPipeline();
+
+protected:
+    explicit GStreamerPipeline(std::unique_ptr<Priv> priv);
+
+    std::unique_ptr<Priv> m_priv;
+};
+
+} // namespace gst
+
+using GStreamerPipeline = gst::GStreamerPipeline;
+
+} // namespace wip
+} // namespace gapi
+} // namespace cv
+
+#endif // OPENCV_GAPI_STREAMING_GSTREAMER_GSTREAMERPIPELINE_HPP

3rdparty/opencv/inc/opencv2/gapi/streaming/gstreamer/gstreamersource.hpp

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+// 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 OPENCV_GAPI_STREAMING_GSTREAMER_GSTREAMERSOURCE_HPP
+#define OPENCV_GAPI_STREAMING_GSTREAMER_GSTREAMERSOURCE_HPP
+
+#include <opencv2/gapi/streaming/source.hpp>
+#include <opencv2/gapi/garg.hpp>
+
+#include <memory>
+
+namespace cv {
+namespace gapi {
+namespace wip {
+namespace gst {
+
+/**
+ * @brief OpenCV's GStreamer streaming source.
+ *        Streams cv::Mat-s/cv::MediaFrame from passed GStreamer pipeline.
+ *
+ * This class implements IStreamSource interface.
+ *
+ * To create GStreamerSource instance you need to pass 'pipeline' and, optionally, 'outputType'
+ * arguments into constructor.
+ * 'pipeline' should represent GStreamer pipeline in form of textual description.
+ * Almost any custom pipeline is supported which can be successfully ran via gst-launch.
+ * The only two limitations are:
+ *      - there should be __one__ appsink element in the pipeline to pass data to OpenCV app.
+ *        Pipeline can actually contain many sink elements, but it must have one and only one
+ *        appsink among them.
+ *
+ *      - data passed to appsink should be video-frame in NV12 format.
+ *
+ * 'outputType' is used to select type of output data to produce: 'cv::MediaFrame' or 'cv::Mat'.
+ * To produce 'cv::MediaFrame'-s you need to pass 'GStreamerSource::OutputType::FRAME' and,
+ * correspondingly, 'GStreamerSource::OutputType::MAT' to produce 'cv::Mat'-s.
+ * Please note, that in the last case, output 'cv::Mat' will be of BGR format, internal conversion
+ * from NV12 GStreamer data will happen.
+ * Default value for 'outputType' is 'GStreamerSource::OutputType::MAT'.
+ *
+ * @note Stream sources are passed to G-API via shared pointers, so please use gapi::make_src<>
+ *       to create objects and ptr() to pass a GStreamerSource to cv::gin().
+ *
+ * @note You need to build OpenCV with GStreamer support to use this class.
+ */
+
+class GStreamerPipelineFacade;
+
+class GAPI_EXPORTS GStreamerSource : public IStreamSource
+{
+public:
+    class Priv;
+
+    // Indicates what type of data should be produced by GStreamerSource: cv::MediaFrame or cv::Mat
+    enum class OutputType {
+        FRAME,
+        MAT
+    };
+
+    GStreamerSource(const std::string& pipeline,
+                    const GStreamerSource::OutputType outputType =
+                        GStreamerSource::OutputType::MAT);
+    GStreamerSource(std::shared_ptr<GStreamerPipelineFacade> pipeline,
+                    const std::string& appsinkName,
+                    const GStreamerSource::OutputType outputType =
+                        GStreamerSource::OutputType::MAT);
+
+    bool pull(cv::gapi::wip::Data& data) override;
+    GMetaArg descr_of() const override;
+    ~GStreamerSource() override;
+
+protected:
+    explicit GStreamerSource(std::unique_ptr<Priv> priv);
+
+    std::unique_ptr<Priv> m_priv;
+};
+
+} // namespace gst
+
+using GStreamerSource = gst::GStreamerSource;
+
+} // namespace wip
+} // namespace gapi
+} // namespace cv
+
+#endif // OPENCV_GAPI_STREAMING_GSTREAMER_GSTREAMERSOURCE_HPP