opencv/modules/videoio/test/test_gstreamer.cpp

// 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.

#include "test_precomp.hpp"

namespace opencv_test
{

typedef tuple< string, Size, Size, int > Param;
typedef testing::TestWithParam< Param > videoio_gstreamer;

TEST_P(videoio_gstreamer, read_write)
{
    if (!videoio_registry::hasBackend(CAP_GSTREAMER))
        throw SkipTestException("GStreamer backend was not found");

    string format    = get<0>(GetParam());
    Size frame_size  = get<1>(GetParam());
    Size mat_size    = get<2>(GetParam());
    int convertToRGB = get<3>(GetParam());
    int count_frames = 10;
    std::ostringstream pipeline;
    pipeline << "videotestsrc pattern=ball num-buffers=" << count_frames << " ! " << format;
    pipeline << ", width=" << frame_size.width << ", height=" << frame_size.height << " ! appsink";
    VideoCapture cap;
    ASSERT_NO_THROW(cap.open(pipeline.str(), CAP_GSTREAMER));
    ASSERT_TRUE(cap.isOpened());

    Mat buffer, decode_frame, gray_frame, rgb_frame;
    for (int i = 0; i < count_frames; ++i)
    {
        cap >> buffer;
        decode_frame = (format == "jpegenc ! image/jpeg") ? imdecode(buffer, IMREAD_UNCHANGED) : buffer;
        EXPECT_EQ(mat_size, decode_frame.size());

        cvtColor(decode_frame, rgb_frame, convertToRGB);
        cvtColor(rgb_frame, gray_frame, COLOR_RGB2GRAY);

        vector<Vec3f> circles;
        HoughCircles(gray_frame, circles, HOUGH_GRADIENT, 1, gray_frame.rows/16, 100, 30, 1, 30 );
        if (circles.size() == 1)
        {
            EXPECT_NEAR(18.5, circles[0][2], 1.0);
        }
        else
        {
            ADD_FAILURE() << "Found " << circles.size() << " on frame " << i ;
        }
    }
    {
        Mat frame;
        cap >> frame;
        EXPECT_TRUE(frame.empty());
    }
    cap.release();
    ASSERT_FALSE(cap.isOpened());
}

Param test_data[] = {
    make_tuple("video/x-raw, format=BGR"  , Size(640, 480), Size(640, 480), COLOR_BGR2RGB),
    make_tuple("video/x-raw, format=GRAY8", Size(640, 480), Size(640, 480), COLOR_GRAY2RGB),
    make_tuple("video/x-raw, format=UYVY" , Size(640, 480), Size(640, 480), COLOR_YUV2RGB_UYVY),
    make_tuple("video/x-raw, format=YUY2" , Size(640, 480), Size(640, 480), COLOR_YUV2RGB_YUY2),
    make_tuple("video/x-raw, format=YVYU" , Size(640, 480), Size(640, 480), COLOR_YUV2RGB_YVYU),
    make_tuple("video/x-raw, format=NV12" , Size(640, 480), Size(640, 720), COLOR_YUV2RGB_NV12),
    make_tuple("video/x-raw, format=NV21" , Size(640, 480), Size(640, 720), COLOR_YUV2RGB_NV21),
    make_tuple("video/x-raw, format=YV12" , Size(640, 480), Size(640, 720), COLOR_YUV2RGB_YV12),
    make_tuple("video/x-raw, format=I420" , Size(640, 480), Size(640, 720), COLOR_YUV2RGB_I420),
    make_tuple("video/x-bayer"            , Size(640, 480), Size(640, 480), COLOR_BayerBG2RGB),
    make_tuple("jpegenc ! image/jpeg"     , Size(640, 480), Size(640, 480), COLOR_BGR2RGB)
};

INSTANTIATE_TEST_CASE_P(videoio, videoio_gstreamer, testing::ValuesIn(test_data));

TEST(Videoio_GStreamer, unsupported_pipeline)
{
    VideoCaptureAPIs apiPref = CAP_GSTREAMER;
    if (!isBackendAvailable(apiPref, cv::videoio_registry::getStreamBackends()))
        throw SkipTestException(cv::String("Backend is not available/disabled: ") + cv::videoio_registry::getBackendName(apiPref));

    // could not link videoconvert0 to matroskamux0, matroskamux0 can't handle caps video/x-raw, format=(string)RGBA
    std::string pipeline = "appsrc ! videoconvert ! video/x-raw, format=(string)RGBA ! matroskamux ! filesink location=test.mkv";
    Size frame_size(640, 480);

    VideoWriter writer;
    EXPECT_NO_THROW(writer.open(pipeline, apiPref, 0/*fourcc*/, 30/*fps*/, frame_size, true));
    EXPECT_FALSE(writer.isOpened());
    // no frames
    EXPECT_NO_THROW(writer.release());

}

} // namespace