test: gstreamer: Factor out code into a base class

A lot of code used in the single stream test is boiler plate and common across every gstreamer test. Factor out this code into a base class called GstreamerTest. Also update the gstreamer_single_stream_test to use the GstreamerTest base class. Signed-off-by: Vedant Paranjape <vedantparanjape160201@gmail.com> Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
2021-09-08 13:24:42 +05:30 · 2021-09-08 13:24:42 +05:30 · 39c2d5dc95
commit 39c2d5dc95
parent a25710428e
4 changed files with 219 additions and 122 deletions
--- a/test/gstreamer/gstreamer_test.cpp
+++ b/test/gstreamer/gstreamer_test.cpp
@ -0,0 +1,155 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2021, Vedant Paranjape
+ *
+ * libcamera Gstreamer element API tests
+ */
+
+#include "gstreamer_test.h"
+
+#include "test.h"
+
+using namespace std;
+
+extern "C" {
+const char *__asan_default_options()
+{
+	/*
+	 * Disable leak detection due to a known global variable initialization
+	 * leak in glib's g_quark_init(). This should ideally be handled by
+	 * using a suppression file instead of disabling leak detection.
+	 */
+	return "detect_leaks=false";
+}
+}
+
+GstreamerTest::GstreamerTest()
+{
+	/*
+	* GStreamer by default spawns a process to run the
+	* gst-plugin-scanner helper. If libcamera is compiled with ASan
+	* enabled, and as GStreamer is most likely not, this causes the
+	* ASan link order check to fail when gst-plugin-scanner
+	* dlopen()s the plugin as many libraries will have already been
+	* loaded by then. Fix this issue by disabling spawning of a
+	* child helper process when scanning the build directory for
+	* plugins.
+	*/
+	gst_registry_fork_set_enabled(false);
+
+	/* Initialize GStreamer */
+	g_autoptr(GError) errInit = NULL;
+	if (!gst_init_check(nullptr, nullptr, &errInit)) {
+		g_printerr("Could not initialize GStreamer: %s\n",
+			   errInit ? errInit->message : "unknown error");
+
+		status_ = TestFail;
+		return;
+	}
+
+	/*
+	* Remove the system libcamera plugin, if any, and add the
+	* plugin from the build directory.
+	*/
+	GstRegistry *registry = gst_registry_get();
+	g_autoptr(GstPlugin) plugin = gst_registry_lookup(registry, "libgstlibcamera.so");
+	if (plugin)
+		gst_registry_remove_plugin(registry, plugin);
+
+	std::string path = libcamera::utils::libcameraBuildPath() + "src/gstreamer";
+	if (!gst_registry_scan_path(registry, path.c_str())) {
+		g_printerr("Failed to add plugin to registry\n");
+
+		status_ = TestFail;
+		return;
+	}
+
+	status_ = TestPass;
+}
+
+GstreamerTest::~GstreamerTest()
+{
+	if (libcameraSrc_ &&
+	    !gst_object_has_as_ancestor(GST_OBJECT(libcameraSrc_),
+					GST_OBJECT(pipeline_)))
+		gst_object_unref(libcameraSrc_);
+	if (pipeline_)
+		gst_object_unref(pipeline_);
+
+	gst_deinit();
+}
+
+int GstreamerTest::createPipeline()
+{
+	g_autoptr(GstElement) libcameraSrc = gst_element_factory_make("libcamerasrc", "libcamera");
+	pipeline_ = gst_pipeline_new("test-pipeline");
+	g_object_ref_sink(libcameraSrc);
+
+	if (!libcameraSrc || !pipeline_) {
+		g_printerr("Unable to create create pipeline %p.%p\n",
+			   libcameraSrc, pipeline_);
+
+		return TestFail;
+	}
+
+	libcameraSrc_ = reinterpret_cast<GstElement *>(g_steal_pointer(&libcameraSrc));
+
+	return TestPass;
+}
+
+int GstreamerTest::startPipeline()
+{
+	GstStateChangeReturn ret;
+
+	/* 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");
+		return TestFail;
+	}
+
+	return TestPass;
+}
+
+int GstreamerTest::processEvent()
+{
+	/* Wait until error or EOS or timeout after 2 seconds */
+	constexpr GstMessageType msgType =
+		static_cast<GstMessageType>(GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
+	constexpr GstClockTime timeout = 2 * GST_SECOND;
+
+	g_autoptr(GstBus) bus = gst_element_get_bus(pipeline_);
+	g_autoptr(GstMessage) msg = gst_bus_timed_pop_filtered(bus, timeout, msgType);
+
+	gst_element_set_state(pipeline_, GST_STATE_NULL);
+
+	/* Parse error message */
+	if (msg == NULL)
+		return TestPass;
+
+	switch (GST_MESSAGE_TYPE(msg)) {
+	case GST_MESSAGE_ERROR:
+		printError(msg);
+		break;
+	case GST_MESSAGE_EOS:
+		g_print("End-Of-Stream reached.\n");
+		break;
+	default:
+		g_printerr("Unexpected message received.\n");
+		break;
+	}
+
+	return TestFail;
+}
+
+void GstreamerTest::printError(GstMessage *msg)
+{
+	g_autoptr(GError) err = NULL;
+	g_autofree gchar *debug_info = NULL;
+
+	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");
+}