[libcamera-devel] [PATCH v1] 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 output, i.e.,
devices that use IPU3 and raspberrypi pipeline. This was tested on
a Raspberry Pi 4B+.

Signed-off-by: Vedant Paranjape <vedantparanjape160201 at gmail.com>
---

I am unable to run Valgrind on my RPI4B+, please check for memory
leaks on RPI4B+ as well. I used the following steps to test on amd64
system using the suppression files.

<snip>
cd libcamera
wget https://cgit.freedesktop.org/gstreamer/common/plain/gst.supp -P /tmp
ninja -C build test
valgrind --leak-check=full --suppressions=/usr/share/glib-2.0/valgrind/glib.supp --suppressions=/tmp/gst.supp ./build/test/gstreamer/single_stream_test
valgrind --leak-check=full --suppressions=/usr/share/glib-2.0/valgrind/glib.supp --suppressions=/tmp/gst.supp ./build/test/gstreamer/multi_stream_test
<snip>

Also please test this test on IPU3 enabled devices too, as I don't have
access to the same.

---
 .../gstreamer/gstreamer_multi_stream_test.cpp | 118 ++++++++++++++++++
 test/gstreamer/meson.build                    |   1 +
 2 files changed, 119 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..76cf5a3418a1
--- /dev/null
+++ b/test/gstreamer/gstreamer_multi_stream_test.cpp
@@ -0,0 +1,118 @@
+/* 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/base/utils.h>
+
+#include <libcamera/libcamera.h>
+
+#include "libcamera/internal/source_paths.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 ! videoconvert ! fakesink";
+		g_autoptr(GError) error0 = NULL;
+		g_autoptr(GError) error1 = NULL;
+		stream0_ = gst_parse_bin_from_description_full(streamDescription, TRUE, NULL, GST_PARSE_FLAG_FATAL_ERRORS, &error0);
+		stream1_ = gst_parse_bin_from_description_full(streamDescription, TRUE, NULL, GST_PARSE_FLAG_FATAL_ERRORS, &error1);
+
+		if (!stream0_ || !stream1_) {
+			g_printerr("Not all bins could be created. %p.%p\n",
+						stream0_, stream1_);
+			return TestFail;
+		}
+		g_object_ref_sink(stream0_);
+		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..13652e87d05c 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