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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
#include "gstreamer_pipeline_facade.hpp"
#include "gstreamerpipeline_priv.hpp"
#include <opencv2/gapi/streaming/gstreamer/gstreamerpipeline.hpp>
#ifdef HAVE_GSTREAMER
#include <gst/app/gstappsink.h>
#endif // HAVE_GSTREAMER
namespace cv {
namespace gapi {
namespace wip {
namespace gst {
#ifdef HAVE_GSTREAMER
GStreamerPipeline::Priv::Priv(const std::string& pipelineDesc):
m_pipeline(std::make_shared<GStreamerPipelineFacade>(pipelineDesc))
{
std::vector<GstElement*> appsinks =
m_pipeline->getElementsByFactoryName("appsink");
for (std::size_t i = 0ul; i < appsinks.size(); ++i)
{
auto* appsink = appsinks[i];
GAPI_Assert(appsink != nullptr);
GStreamerPtr<gchar> name(gst_element_get_name(appsink));
auto result = m_appsinkNamesToUse.insert({ name.get(), true /* free */ });
GAPI_Assert(std::get<1>(result) && "Each appsink name must be unique!");
}
}
IStreamSource::Ptr GStreamerPipeline::Priv::getStreamingSource(
const std::string& appsinkName, const GStreamerSource::OutputType outputType)
{
auto appsinkNameIt = m_appsinkNamesToUse.find(appsinkName);
if (appsinkNameIt == m_appsinkNamesToUse.end())
{
cv::util::throw_error(std::logic_error(std::string("There is no appsink element in the "
"pipeline with the name '") + appsinkName + "'."));
}
if (!appsinkNameIt->second)
{
cv::util::throw_error(std::logic_error(std::string("appsink element with the name '") +
appsinkName + "' has been already used to create a GStreamerSource!"));
}
m_appsinkNamesToUse[appsinkName] = false /* not free */;
IStreamSource::Ptr src;
try {
src = cv::gapi::wip::make_src<cv::gapi::wip::GStreamerSource>(m_pipeline, appsinkName,
outputType);
}
catch(...) {
m_appsinkNamesToUse[appsinkName] = true; /* free */
cv::util::throw_error(std::runtime_error(std::string("Error during creation of ") +
"GStreamerSource on top of '" + appsinkName + "' appsink element!"));
}
return src;
}
GStreamerPipeline::Priv::~Priv() { }
#else // HAVE_GSTREAMER
GStreamerPipeline::Priv::Priv(const std::string&)
{
GAPI_Error("Built without GStreamer support!");
}
IStreamSource::Ptr GStreamerPipeline::Priv::getStreamingSource(const std::string&,
const GStreamerSource::OutputType)
{
// No need an assert here. The assert raise C4702 warning. Constructor have already got assert.
return nullptr;
}
GStreamerPipeline::Priv::~Priv()
{
// No need an assert here. The assert raise C4722 warning. Constructor have already got assert.
}
#endif // HAVE_GSTREAMER
GStreamerPipeline::GStreamerPipeline(const std::string& pipelineDesc):
m_priv(new Priv(pipelineDesc)) { }
IStreamSource::Ptr GStreamerPipeline::getStreamingSource(
const std::string& appsinkName, const GStreamerSource::OutputType outputType)
{
return m_priv->getStreamingSource(appsinkName, outputType);
}
GStreamerPipeline::~GStreamerPipeline()
{ }
GStreamerPipeline::GStreamerPipeline(std::unique_ptr<Priv> priv):
m_priv(std::move(priv))
{ }
} // namespace gst
} // namespace wip
} // namespace gapi
} // namespace cv
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