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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 or GRAY8 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 / GRAY8 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;
// NB: Overload for using from python
GAPI_EXPORTS_W cv::Ptr<IStreamSource>
inline make_gst_src(const std::string& pipeline,
const GStreamerSource::OutputType outputType =
GStreamerSource::OutputType::MAT)
{
return make_src<GStreamerSource>(pipeline, outputType);
}
} // namespace wip
} // namespace gapi
} // namespace cv
#endif // OPENCV_GAPI_STREAMING_GSTREAMER_GSTREAMERSOURCE_HPP
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