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

[Jean-Michel Hautbois]

Hi Vedant,

On 14/09/2021 10:46, Vedant Paranjape wrote:
> This patch adds a test to test if multi stream using libcamera's
> gstreamer element works.

A test to test :-) ?
A proposal (I am not good at writing commit messages though so, please
use it with care :-)):

> 
> Test will run only on devices that support multistream output, i.e.,
> devices that use IPU3 and RPI pipeline. This was tested on a Raspberry
> Pi 4B+
> 
> Signed-off-by: Vedant Paranjape <vedantparanjape160201 at gmail.com>
> Reviewed-by: Paul Elder <paul.elder at ideasonboard.com>
> Tested-by: Paul Elder <paul.elder at ideasonboard.com>
> ---
>  .../gstreamer/gstreamer_multi_stream_test.cpp | 138 ++++++++++++++++++
>  test/gstreamer/meson.build                    |   1 +
>  2 files changed, 139 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..aea9a1dcb211
> --- /dev/null
> +++ b/test/gstreamer/gstreamer_multi_stream_test.cpp
> @@ -0,0 +1,138 @@
> +/* 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;
> +		}
> +
> +		g_autoptr(GstElement) convert0 = gst_element_factory_make("videoconvert", "convert0");
> +		g_autoptr(GstElement) convert1 = gst_element_factory_make("videoconvert", "convert1");

Why do you need a convert element ? AFAIK you are outputting into a
fakesink it should not be an issue ?

> +		g_autoptr(GstElement) sink0 = gst_element_factory_make("fakesink", "sink0");
> +		g_autoptr(GstElement) sink1 = gst_element_factory_make("fakesink", "sink1");
> +		g_autoptr(GstElement) queue0 = gst_element_factory_make("queue", "queue0");
> +		g_autoptr(GstElement) queue1 = gst_element_factory_make("queue", "queue1");
> +		g_object_ref_sink(convert0);
> +		g_object_ref_sink(convert1);
> +		g_object_ref_sink(sink0);
> +		g_object_ref_sink(sink1);
> +		g_object_ref_sink(queue0);
> +		g_object_ref_sink(queue1);

I don't really like that, why can't you use
gst_parse_bin_from_description() for instance ?
That way you would get a bin you could link to libcamerasrc.

Note: it is a long time since I really use GStreamer so I may not be
up-to-date, Nicolas may a different comment, and he would be the one to
follow ;-).

> +
> +		if (!convert0 || !convert1 || !sink0 || !sink1 || !queue0 || !queue1) {
> +			g_printerr("Not all elements could be created. %p.%p.%p.%p.%p.%p\n",
> +				   convert0, convert1, sink0, sink1, queue0, queue1);
> +
> +			return TestFail;
> +		}
> +
> +		if (createPipeline() != TestPass)
> +			return TestFail;
> +
> +		convert0_ = reinterpret_cast<GstElement *>(g_steal_pointer(&convert0));
> +		convert1_ = reinterpret_cast<GstElement *>(g_steal_pointer(&convert1));
> +		sink0_ = reinterpret_cast<GstElement *>(g_steal_pointer(&sink0));
> +		sink1_ = reinterpret_cast<GstElement *>(g_steal_pointer(&sink1));
> +		queue0_ = reinterpret_cast<GstElement *>(g_steal_pointer(&queue0));
> +		queue1_ = reinterpret_cast<GstElement *>(g_steal_pointer(&queue1));
> +
> +		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_, queue0_, queue1_,
> +				 convert0_, convert1_, sink0_, sink1_, NULL);
> +		if (gst_element_link_many(queue0_, convert0_, sink0_, NULL) != TRUE ||
> +		    gst_element_link_many(queue1_, convert1_, sink1_, NULL) != TRUE) {
> +			g_printerr("Elements could not be linked.\n");
> +			return TestFail;
> +		}
> +
> +		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");
> +		GstPad *queue0_sink_pad = gst_element_get_static_pad(queue0_, "sink");
> +		GstPad *queue1_sink_pad = gst_element_get_static_pad(queue1_, "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) {
> +			if (queue0_sink_pad)
> +				gst_object_unref(queue0_sink_pad);
> +			if (queue1_sink_pad)
> +				gst_object_unref(queue1_sink_pad);
> +			g_printerr("Pads could not be linked.\n");
> +			return TestFail;
> +		}
> +		gst_object_unref(queue0_sink_pad);
> +		gst_object_unref(queue1_sink_pad);
> +
> +		if (startPipeline() != TestPass)
> +			return TestFail;
> +
> +		if (processEvent() != TestPass)
> +			return TestFail;
> +
> +		return TestPass;
> +	}
> +
> +private:
> +	std::string cameraName;
> +	GstElement *convert0_;
> +	GstElement *convert1_;
> +	GstElement *sink0_;
> +	GstElement *sink1_;
> +	GstElement *queue0_;
> +	GstElement *queue1_;
> +};
> +
> +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)
>  
>