[libcamera-devel] [PATCH v4] test: gstreamer: Add a test for gstreamer multi stream

[Vedant Paranjape]

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

Test will run only on devices that support multistream capture, eg.,
devices that use IPU3 and raspberrypi pipeline. This was tested on
a Raspberry Pi 4B+.

Signed-off-by: Vedant Paranjape <vedantparanjape160201 at gmail.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne at collabora.com>
---
 .../gstreamer/gstreamer_multi_stream_test.cpp | 124 ++++++++++++++++++
 test/gstreamer/meson.build                    |   1 +
 2 files changed, 125 insertions(+)
 create mode 100644 test/gstreamer/gstreamer_multi_stream_test.cpp

diff --git a/test/gstreamer/gstreamer_multi_stream_test.cpp b/test/gstreamer/gstreamer_multi_stream_test.cpp
new file mode 100644
index 000000000000..6a9a6f2509cb
--- /dev/null
+++ b/test/gstreamer/gstreamer_multi_stream_test.cpp
@@ -0,0 +1,124 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2021, Vedant Paranjape
+ *
+ * gstreamer_multi_stream_test.cpp - GStreamer multi stream capture test
+ */
+
+#include <iostream>
+#include <unistd.h>
+
+#include <libcamera/libcamera.h>
+
+#include <gst/gst.h>
+
+#include "gstreamer_test.h"
+#include "test.h"
+
+using namespace std;
+
+class GstreamerMultiStreamTest : public GstreamerTest, public Test
+{
+public:
+	GstreamerMultiStreamTest()
+		: GstreamerTest()
+	{
+	}
+
+protected:
+	int init() override
+	{
+		if (status_ != TestPass)
+			return status_;
+
+		/* Check if platform support multistream output */
+		libcamera::CameraManager cm;
+		cm.start();
+		bool cameraFound = false;
+		for (auto &camera : cm.cameras()) {
+			if (camera->streams().size() > 1) {
+				cameraName_ = camera->id();
+				cameraFound = true;
+				cm.stop();
+				break;
+			}
+		}
+
+		if (!cameraFound) {
+			cm.stop();
+			return TestSkip;
+		}
+
+		const gchar *streamDescription = "queue ! fakesink";
+		g_autoptr(GError) error = NULL;
+
+		stream0_ = gst_parse_bin_from_description_full(streamDescription, TRUE,
+							       NULL,
+							       GST_PARSE_FLAG_FATAL_ERRORS,
+							       &error);
+		if (!stream0_) {
+			g_printerr("Stream0 could not be created (%s)\n", error->message);
+			return TestFail;
+		}
+		g_object_ref_sink(stream0_);
+
+		stream1_ = gst_parse_bin_from_description_full(streamDescription, TRUE,
+							       NULL,
+							       GST_PARSE_FLAG_FATAL_ERRORS,
+							       &error);
+		if (!stream1_) {
+			g_printerr("Stream1 could not be created (%s)\n", error->message);
+			return TestFail;
+		}
+		g_object_ref_sink(stream1_);
+
+		if (createPipeline() != TestPass)
+			return TestFail;
+
+		return TestPass;
+	}
+
+	int run() override
+	{
+		g_object_set(libcameraSrc_, "camera-name", cameraName_.c_str(), NULL);
+
+		/* Build the pipeline */
+		gst_bin_add_many(GST_BIN(pipeline_), libcameraSrc_,
+				 stream0_, stream1_, NULL);
+
+		g_autoptr(GstPad) src_pad = gst_element_get_static_pad(libcameraSrc_, "src");
+		g_autoptr(GstPad) request_pad = gst_element_get_request_pad(libcameraSrc_, "src_%u");
+
+		{
+			g_autoptr(GstPad) queue0_sink_pad = gst_element_get_static_pad(stream0_, "sink");
+			g_autoptr(GstPad) queue1_sink_pad = gst_element_get_static_pad(stream1_, "sink");
+
+			if (gst_pad_link(src_pad, queue0_sink_pad) != GST_PAD_LINK_OK ||
+			    gst_pad_link(request_pad, queue1_sink_pad) != GST_PAD_LINK_OK) {
+				g_printerr("Pads could not be linked.\n");
+				return TestFail;
+			}
+		}
+
+		if (startPipeline() != TestPass)
+			return TestFail;
+
+		if (processEvent() != TestPass)
+			return TestFail;
+
+		return TestPass;
+	}
+
+	void cleanup() override
+	{
+		g_clear_object(&stream0_);
+		g_clear_object(&stream1_);
+	}
+
+private:
+	std::string cameraName_;
+	GstElement *stream0_;
+	GstElement *stream1_;
+};
+
+TEST_REGISTER(GstreamerMultiStreamTest)
diff --git a/test/gstreamer/meson.build b/test/gstreamer/meson.build
index aca53b920365..10058fc5206f 100644
--- a/test/gstreamer/meson.build
+++ b/test/gstreamer/meson.build
@@ -6,6 +6,7 @@ endif
 
 gstreamer_tests = [
     ['single_stream_test',   'gstreamer_single_stream_test.cpp'],
+    ['multi_stream_test',    'gstreamer_multi_stream_test.cpp'],
 ]
 gstreamer_dep = dependency('gstreamer-1.0', required: true)
 
-- 
2.25.1