Added tests for gstreamer pipeline

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"
+#ifdef HAVE_GSTREAMER
+
+namespace opencv_test
+{
+typedef tuple< string, Size, Size, int > Param;
+typedef testing::TestWithParam< Param > Videoio_Gstreamer_Test;
+
+TEST_P(Videoio_Gstreamer_Test, test_object_structure)
+{
+    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 << ", framerate=1/1, width=" << frame_size.width << ", height=" << frame_size.height << " ! appsink";
+    VideoCapture cap(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_Test, testing::ValuesIn(test_data));
+
+} // namespace
+
+#endif