[libcamera-devel] [PATCH v2] test: gstreamer: Add unit test to test gstreamer single stream working

[Vedant Paranjape]

This patch adds unit test to test if single stream using
libcamera's gstreamer element works.

Signed-off-by: Vedant Paranjape <vedantparanjape160201 at gmail.com>
---
 .../gstreamer_single_stream_test.cpp          | 118 ++++++++++++++++++
 test/gstreamer/meson.build                    |  15 +++
 test/meson.build                              |   1 +
 3 files changed, 134 insertions(+)
 create mode 100644 test/gstreamer/gstreamer_single_stream_test.cpp
 create mode 100644 test/gstreamer/meson.build

diff --git a/test/gstreamer/gstreamer_single_stream_test.cpp b/test/gstreamer/gstreamer_single_stream_test.cpp
new file mode 100644
index 00000000..c249a048
--- /dev/null
+++ b/test/gstreamer/gstreamer_single_stream_test.cpp
@@ -0,0 +1,118 @@
+#include <iostream>
+#include <gst/gst.h>
+
+#include "test.h"
+
+using namespace std;
+
+class GstreamerSingleStreamTest: public Test
+{
+protected:
+    GstElement *pipeline, *libcamera_src, *convert0, *sink0;
+    GstBus *bus;
+    GstMessage *msg;
+    GstStateChangeReturn ret;
+
+    int GstreamerPrintError(GstMessage *msg_)
+    {
+        int TestResult = TestPass;
+
+        if (msg_ != NULL) {
+            GError *err;
+            gchar *debug_info;
+
+            switch (GST_MESSAGE_TYPE(msg_)) {
+                case GST_MESSAGE_ERROR:
+                    gst_message_parse_error(msg_, &err, &debug_info);
+                    g_printerr("Error received from element %s: %s\n", GST_OBJECT_NAME(msg_->src), err->message);
+                    g_printerr("Debugging information: %s\n", debug_info ? debug_info : "none");
+                    g_clear_error(&err);
+                    g_free(debug_info);
+                    TestResult = TestFail;
+                    break;
+                case GST_MESSAGE_EOS:
+                    g_printerr("End-Of-Stream reached.\n");
+                    TestResult = TestFail;
+                    break;
+                default:
+                    /* We should not reach here because we only asked for ERRORs and EOS */
+                    g_printerr("Unexpected message received.\n");
+                    TestResult = TestFail;
+                    break;
+            }
+        }
+
+        return TestResult;
+    }
+
+    int init() override
+    {
+        /* Initialize GStreamer */
+        GError *err_init = nullptr;
+        if (!gst_init_check(nullptr, nullptr, &err_init)) {
+            g_printerr ("Could not initialize GStreamer: %s\n", err_init ? err_init->message : "unknown error occurred");
+            if (err_init) {
+                g_error_free(err_init);
+            }
+
+            return TestFail;
+        }
+
+        /* Create the elements */
+        libcamera_src = gst_element_factory_make("libcamerasrc", "libcamera");
+        convert0 = gst_element_factory_make("videoconvert", "convert0");
+        sink0 = gst_element_factory_make("autovideosink", "sink0");
+
+        /* Create the empty pipeline */
+        pipeline = gst_pipeline_new("test-pipeline");
+
+        if (!pipeline || !convert0 || !sink0 || !libcamera_src) {
+            g_printerr("Not all elements could be created.\n");
+            return TestFail;
+        }
+
+        return TestPass;
+    }
+
+    void cleanup() override
+    {
+        gst_message_unref(msg);
+        gst_object_unref(bus);
+        gst_element_set_state(pipeline, GST_STATE_NULL);
+        gst_object_unref(pipeline);
+    }
+
+    int run() override
+    {
+        /* Build the pipeline */
+        gst_bin_add_many(GST_BIN(pipeline), libcamera_src, convert0, sink0, NULL);
+        if (gst_element_link_many(libcamera_src, convert0, sink0, NULL) != TRUE) {
+            g_printerr("Elements could not be linked (1).\n");
+            gst_object_unref(pipeline);
+            return TestFail;
+        }
+
+        /* Start playing */
+        ret = gst_element_set_state(pipeline, GST_STATE_PLAYING);
+        if (ret == GST_STATE_CHANGE_FAILURE) {
+            g_printerr("Unable to set the pipeline to the playing state.\n");
+            gst_object_unref(pipeline);
+            return TestFail;
+        }
+
+        /* Wait until error or EOS or timeout after 2 seconds*/
+        GstClockTime timeout = 2000000000;
+        bus = gst_element_get_bus(pipeline);
+        msg = gst_bus_timed_pop_filtered(bus, timeout,
+                                    GstMessageType((uint)GST_MESSAGE_ERROR | (uint)GST_MESSAGE_EOS));
+
+        /* Parse error message */
+        if (GstreamerPrintError(msg) == TestFail) {
+            return TestFail;
+        }
+
+        return TestPass;
+    }
+};
+
+TEST_REGISTER(GstreamerSingleStreamTest)
diff --git a/test/gstreamer/meson.build b/test/gstreamer/meson.build
new file mode 100644
index 00000000..36643d4a
--- /dev/null
+++ b/test/gstreamer/meson.build
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: CC0-1.0
+
+gstreamer_tests = [
+    ['single_stream_test',   'gstreamer_single_stream_test.cpp'],
+]
+gstreamer_dep = dependency('gstreamer-1.0', required: true)
+
+foreach t : gstreamer_tests
+    exe = executable(t[0], t[1],
+                     dependencies : [libcamera_private, gstreamer_dep],
+                     link_with : test_libraries,
+                     include_directories : test_includes_internal)
+
+    test(t[0], exe, suite : 'gstreamer', is_parallel : false)
+endforeach
diff --git a/test/meson.build b/test/meson.build
index 3bceb5df..d0466f17 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -11,6 +11,7 @@ subdir('libtest')
 
 subdir('camera')
 subdir('controls')
+subdir('gstreamer')
 subdir('ipa')
 subdir('ipc')
 subdir('log')
-- 
2.25.1