[libcamera-devel] [PATCH v8] test: gstreamer: Add test for gstreamer single stream

[Vedant Paranjape]

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

Signed-off-by: Vedant Paranjape <vedantparanjape160201 at gmail.com>
Reviewed-by: Paul Elder <paul.elder at ideasonboard.com>
---
 .../gstreamer_single_stream_test.cpp          | 148 ++++++++++++++++++
 test/gstreamer/meson.build                    |  19 +++
 test/meson.build                              |   1 +
 3 files changed, 168 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..c0d38ff8
--- /dev/null
+++ b/test/gstreamer/gstreamer_single_stream_test.cpp
@@ -0,0 +1,148 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2021, Vedant Paranjape
+ *
+ * ipa_interface_test.cpp - Test the IPA interface
+ */
+
+#include <iostream>
+
+#include <libcamera/base/utils.h>
+
+#include <gst/gst.h>
+
+#include "test.h"
+
+using namespace std;
+
+class GstreamerSingleStreamTest : public Test
+{
+protected:
+	int init() override
+	{
+		/* Initialize GStreamer */
+		GError *errInit = nullptr;
+		if (!gst_init_check(nullptr, nullptr, &errInit)) {
+			g_printerr("Could not initialize GStreamer: %s\n",
+				   errInit ? errInit->message : "unknown error");
+			if (errInit)
+				g_error_free(errInit);
+
+			return TestFail;
+		}
+
+		/*
+		* Remove the system libcamera plugin, if any, and add the
+		* plugin from the build directory.
+		*/
+		GstRegistry *registry = gst_registry_get();
+		GstPlugin *plugin = gst_registry_lookup(registry, "libgstlibcamera.so");
+		if (plugin) {
+			gst_registry_remove_plugin(registry, plugin);
+			gst_object_unref(plugin);
+		}
+		
+		std::string path = std::string(libcamera::utils::libcameraBuildPath()
+					+ "src/gstreamer");
+		if (!gst_registry_scan_path(registry, path.c_str())) {
+			g_printerr("Failed to add plugin to registry\n");
+			gst_deinit();
+			return TestFail;
+		}
+
+		/* Create the elements */
+		libcameraSrc_ = gst_element_factory_make("libcamerasrc", "libcamera");
+		convert0_ = gst_element_factory_make("videoconvert", "convert0");
+		sink0_ = gst_element_factory_make("fakevideosink", "sink0");
+
+		/* Create the empty pipeline_ */
+		pipeline_ = gst_pipeline_new("test-pipeline");
+
+		if (!pipeline_ || !convert0_ || !sink0_ || !libcameraSrc_) {
+			g_printerr("Not all elements could be created.\n");
+			gst_object_unref(pipeline_);
+			gst_object_unref(convert0_);
+			gst_object_unref(sink0_);
+			gst_object_unref(libcameraSrc_);
+			gst_deinit();
+
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+
+	void cleanup() override
+	{
+		gst_object_unref(pipeline_);
+		gst_deinit();
+	}
+
+	int run() override
+	{
+		GstStateChangeReturn ret;
+		g_autoptr(GstBus) bus;
+		g_autoptr(GstMessage) msg;
+
+		/* Build the pipeline */
+		gst_bin_add_many(GST_BIN(pipeline_), libcameraSrc_, convert0_, sink0_, NULL);
+		if (gst_element_link_many(libcameraSrc_, convert0_, sink0_, NULL) != TRUE) {
+			g_printerr("Elements could not be linked.\n");
+			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");
+			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));
+		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:
+			gstreamer_print_error(msg);
+			break;
+		case GST_MESSAGE_EOS:
+			g_print("End-Of-Stream reached.\n");
+			break;
+		default:
+			g_printerr("Unexpected message received.\n");
+			break;
+		}
+
+		return TestFail;
+	}
+
+private:
+	void gstreamer_print_error(GstMessage *msg)
+	{
+		GError *err;
+		gchar *debug_info;
+
+		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);
+	}
+
+	GstElement *pipeline_;
+	GstElement *libcameraSrc_;
+	GstElement *convert0_;
+	GstElement *sink0_;
+};
+
+TEST_REGISTER(GstreamerSingleStreamTest)
diff --git a/test/gstreamer/meson.build b/test/gstreamer/meson.build
new file mode 100644
index 00000000..b99aa0da
--- /dev/null
+++ b/test/gstreamer/meson.build
@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: CC0-1.0
+
+if not gst_enabled
+    subdir_done()
+endif
+
+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