lc-compliance: Add a libcamera compliance tool

Add a compliance tool to ease testing of cameras. In contrast to the
unit-tests under test/ that aims to test the internal components of
libcamera the compliance tool aims to test application use-cases and to
some extent the public API.

This change adds the boilerplate code of a simple framework for the
creation of tests. The tests aim both to demonstrate the tool and to
catch real problems. The tests added are:

 - Test that if one queues exactly N requests to a camera exactly N
   requests are eventually completed.

 - Test that a configured camera can be started and stopped multiple
   times in an attempt to exercise cleanup code paths otherwise not
   often tested with 'cam' for example.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>

11 files changed, 600 insertions, 0 deletions

diff --git a/meson.build b/meson.build
index 3a615ae3..13d88301 100644
--- a/meson.build
+++ b/meson.build
@@ -173,5 +173,6 @@ summary({
             'V4L2 emulation support': v4l2_enabled,
             'cam application': cam_enabled,
             'qcam application': qcam_enabled,
+            'lc-compliance application': lc_compliance_enabled,
             'Unit tests': test_enabled,
         }, section : 'Configuration')
diff --git a/meson_options.txt b/meson_options.txt
index 12de8fa1..69f11f85 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -25,6 +25,11 @@ option('gstreamer',
         value : 'auto',
         description : 'Compile libcamera GStreamer plugin')
 
+option('lc-compliance',
+        type : 'feature',
+        value : 'auto',
+        description : 'Compile the lc-compliance test application')
+
 option('pipelines',
         type : 'array',
         choices : ['ipu3', 'raspberrypi', 'rkisp1', 'simple', 'uvcvideo', 'vimc'],
diff --git a/src/lc-compliance/main.cpp b/src/lc-compliance/main.cpp
new file mode 100644
index 00000000..54cee54a
--- /dev/null
+++ b/src/lc-compliance/main.cpp
@@ -0,0 +1,148 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * main.cpp - lc-compliance - The libcamera compliance tool
+ */
+
+#include <iomanip>
+#include <iostream>
+#include <string.h>
+
+#include <libcamera/libcamera.h>
+
+#include "../cam/options.h"
+#include "tests.h"
+
+using namespace libcamera;
+
+enum {
+	OptCamera = 'c',
+	OptHelp = 'h',
+};
+
+class Harness
+{
+public:
+	Harness(const OptionsParser::Options &options);
+	~Harness();
+
+	int exec();
+
+private:
+	int init();
+	void listCameras();
+
+	OptionsParser::Options options_;
+	std::unique_ptr<CameraManager> cm_;
+	std::shared_ptr<Camera> camera_;
+};
+
+Harness::Harness(const OptionsParser::Options &options)
+	: options_(options)
+{
+	cm_ = std::make_unique<CameraManager>();
+}
+
+Harness::~Harness()
+{
+	if (camera_) {
+		camera_->release();
+		camera_.reset();
+	}
+
+	cm_->stop();
+}
+
+int Harness::exec()
+{
+	int ret = init();
+	if (ret)
+		return ret;
+
+	std::vector<Results> results;
+
+	results.push_back(testSingleStream(camera_));
+
+	for (const Results &result : results) {
+		ret = result.summary();
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+int Harness::init()
+{
+	int ret = cm_->start();
+	if (ret) {
+		std::cout << "Failed to start camera manager: "
+			  << strerror(-ret) << std::endl;
+		return ret;
+	}
+
+	if (!options_.isSet(OptCamera)) {
+		std::cout << "No camera specified, available cameras:" << std::endl;
+		listCameras();
+		return -ENODEV;
+	}
+
+	const std::string &cameraId = options_[OptCamera];
+	camera_ = cm_->get(cameraId);
+	if (!camera_) {
+		std::cout << "Camera " << cameraId << " not found, available cameras:" << std::endl;
+		listCameras();
+		return -ENODEV;
+	}
+
+	if (camera_->acquire()) {
+		std::cout << "Failed to acquire camera" << std::endl;
+		return -EINVAL;
+	}
+
+	std::cout << "Using camera " << cameraId << std::endl;
+
+	return 0;
+}
+
+void Harness::listCameras()
+{
+	for (const std::shared_ptr<Camera> &cam : cm_->cameras())
+		std::cout << "- " << cam.get()->id() << std::endl;
+}
+
+static int parseOptions(int argc, char **argv, OptionsParser::Options *options)
+{
+	OptionsParser parser;
+	parser.addOption(OptCamera, OptionString,
+			 "Specify which camera to operate on, by id", "camera",
+			 ArgumentRequired, "camera");
+	parser.addOption(OptHelp, OptionNone, "Display this help message",
+			 "help");
+
+	*options = parser.parse(argc, argv);
+	if (!options->valid())
+		return -EINVAL;
+
+	if (options->isSet(OptHelp)) {
+		parser.usage();
+		return -EINTR;
+	}
+
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	OptionsParser::Options options;
+	int ret = parseOptions(argc, argv, &options);
+	if (ret == -EINTR)
+		return EXIT_SUCCESS;
+	if (ret < 0)
+		return EXIT_FAILURE;
+
+	Harness harness(options);
+
+	return harness.exec() ? EXIT_FAILURE : EXIT_SUCCESS;
+}
diff --git a/src/lc-compliance/meson.build b/src/lc-compliance/meson.build
new file mode 100644
index 00000000..a2bfcceb
--- /dev/null
+++ b/src/lc-compliance/meson.build
@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: CC0-1.0
+
+libevent = dependency('libevent_pthreads', required : get_option('lc-compliance'))
+
+if not libevent.found()
+    lc_compliance_enabled = false
+    subdir_done()
+endif
+
+lc_compliance_enabled = true
+
+lc_compliance_sources = files([
+    '../cam/event_loop.cpp',
+    '../cam/options.cpp',
+    'main.cpp',
+    'results.cpp',
+    'simple_capture.cpp',
+    'single_stream.cpp',
+])
+
+lc_compliance  = executable('lc-compliance', lc_compliance_sources,
+                            dependencies : [
+                                libatomic,
+                                libcamera_dep,
+                                libevent,
+                            ],
+                            install : true)
diff --git a/src/lc-compliance/results.cpp b/src/lc-compliance/results.cpp
new file mode 100644
index 00000000..f149f785
--- /dev/null
+++ b/src/lc-compliance/results.cpp
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * results.cpp - Test result aggregator
+ */
+
+#include "results.h"
+
+#include <iostream>
+
+void Results::add(const Result &result)
+{
+	if (result.first == Pass)
+		passed_++;
+	else if (result.first == Fail)
+		failed_++;
+	else if (result.first == Skip)
+		skipped_++;
+
+	printResult(result);
+}
+
+void Results::add(Status status, const std::string &message)
+{
+	add({ status, message });
+}
+
+void Results::fail(const std::string &message)
+{
+	add(Fail, message);
+}
+
+void Results::pass(const std::string &message)
+{
+	add(Pass, message);
+}
+
+void Results::skip(const std::string &message)
+{
+	add(Skip, message);
+}
+
+int Results::summary() const
+{
+	if (failed_ + passed_ + skipped_ != planned_) {
+		std::cout << "Planned and executed number of tests differ "
+			  << failed_ + passed_ + skipped_ << " executed "
+			  << planned_ << " planned" << std::endl;
+
+		return -EINVAL;
+	}
+
+	std::cout << planned_ << " tests executed, "
+		  << passed_ << " tests passed, "
+		  << skipped_ << " tests skipped and "
+		  << failed_ << " tests failed " << std::endl;
+
+	return 0;
+}
+
+void Results::printResult(const Result &result)
+{
+	std::string prefix;
+
+	/* \todo Make parsable as TAP. */
+	if (result.first == Pass)
+		prefix = "PASS";
+	else if (result.first == Fail)
+		prefix = "FAIL";
+	else if (result.first == Skip)
+		prefix = "SKIP";
+
+	std::cout << "- " << prefix << ": " << result.second << std::endl;
+}
diff --git a/src/lc-compliance/results.h b/src/lc-compliance/results.h
new file mode 100644
index 00000000..2a3722b8
--- /dev/null
+++ b/src/lc-compliance/results.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * results.h - Test result aggregator
+ */
+#ifndef __LC_COMPLIANCE_RESULTS_H__
+#define __LC_COMPLIANCE_RESULTS_H__
+
+#include <string>
+#include <utility>
+
+/* \todo Check if result aggregator can be shared with self tests in test/ */
+class Results
+{
+public:
+	enum Status {
+		Fail,
+		Pass,
+		Skip,
+	};
+
+	using Result = std::pair<Status, std::string>;
+
+	Results(unsigned int planned)
+		: planned_(planned), passed_(0), failed_(0), skipped_(0)
+	{
+	}
+
+	void add(const Result &result);
+	void add(Status status, const std::string &message);
+	void fail(const std::string &message);
+	void pass(const std::string &message);
+	void skip(const std::string &message);
+
+	int summary() const;
+
+private:
+	void printResult(const Result &result);
+
+	unsigned int planned_;
+	unsigned int passed_;
+	unsigned int failed_;
+	unsigned int skipped_;
+};
+
+#endif /* __LC_COMPLIANCE_RESULTS_H__ */
diff --git a/src/lc-compliance/simple_capture.cpp b/src/lc-compliance/simple_capture.cpp
new file mode 100644
index 00000000..389dc11f
--- /dev/null
+++ b/src/lc-compliance/simple_capture.cpp
@@ -0,0 +1,151 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * simple_capture.cpp - Simple capture helper
+ */
+
+#include "simple_capture.h"
+
+using namespace libcamera;
+
+SimpleCapture::SimpleCapture(std::shared_ptr<Camera> camera)
+	: camera_(camera), allocator_(std::make_unique<FrameBufferAllocator>(camera))
+{
+}
+
+SimpleCapture::~SimpleCapture()
+{
+}
+
+Results::Result SimpleCapture::configure(StreamRole role)
+{
+	config_ = camera_->generateConfiguration({ role });
+
+	if (config_->validate() != CameraConfiguration::Valid) {
+		config_.reset();
+		return { Results::Fail, "Configuration not valid" };
+	}
+
+	if (camera_->configure(config_.get())) {
+		config_.reset();
+		return { Results::Fail, "Failed to configure camera" };
+	}
+
+	return { Results::Pass, "Configure camera" };
+}
+
+Results::Result SimpleCapture::start()
+{
+	Stream *stream = config_->at(0).stream();
+	if (allocator_->allocate(stream) < 0)
+		return { Results::Fail, "Failed to allocate buffers" };
+
+	if (camera_->start())
+		return { Results::Fail, "Failed to start camera" };
+
+	camera_->requestCompleted.connect(this, &SimpleCapture::requestComplete);
+
+	return { Results::Pass, "Started camera" };
+}
+
+Results::Result SimpleCapture::stop()
+{
+	Stream *stream = config_->at(0).stream();
+
+	camera_->stop();
+
+	camera_->requestCompleted.disconnect(this, &SimpleCapture::requestComplete);
+
+	allocator_->free(stream);
+
+	return { Results::Pass, "Stopped camera" };
+}
+
+/* SimpleCaptureBalanced */
+
+SimpleCaptureBalanced::SimpleCaptureBalanced(std::shared_ptr<Camera> camera)
+	: SimpleCapture(camera)
+{
+}
+
+Results::Result SimpleCaptureBalanced::capture(unsigned int numRequests)
+{
+	Results::Result ret = start();
+	if (ret.first != Results::Pass)
+		return ret;
+
+	Stream *stream = config_->at(0).stream();
+	const std::vector<std::unique_ptr<FrameBuffer>> &buffers = allocator_->buffers(stream);
+
+	/* No point in testing less requests then the camera depth. */
+	if (buffers.size() > numRequests) {
+		/* Cache buffers.size() before we destroy it in stop() */
+		int buffers_size = buffers.size();
+		stop();
+
+		return { Results::Skip, "Camera needs " + std::to_string(buffers_size)
+			+ " requests, can't test only " + std::to_string(numRequests) };
+	}
+
+	queueCount_ = 0;
+	captureCount_ = 0;
+	captureLimit_ = numRequests;
+
+	/* Queue the recommended number of reqeuests. */
+	std::vector<std::unique_ptr<libcamera::Request>> requests;
+	for (const std::unique_ptr<FrameBuffer> &buffer : buffers) {
+		std::unique_ptr<Request> request = camera_->createRequest();
+		if (!request) {
+			stop();
+			return { Results::Fail, "Can't create request" };
+		}
+
+		if (request->addBuffer(stream, buffer.get())) {
+			stop();
+			return { Results::Fail, "Can't set buffer for request" };
+		}
+
+		if (queueRequest(request.get()) < 0) {
+			stop();
+			return { Results::Fail, "Failed to queue request" };
+		}
+
+		requests.push_back(std::move(request));
+	}
+
+	/* Run capture session. */
+	loop_ = new EventLoop();
+	loop_->exec();
+	stop();
+	delete loop_;
+
+	if (captureCount_ != captureLimit_)
+		return { Results::Fail, "Got " + std::to_string(captureCount_) +
+			" request, wanted " + std::to_string(captureLimit_) };
+
+	return { Results::Pass, "Balanced capture of " +
+		std::to_string(numRequests) + " requests" };
+}
+
+int SimpleCaptureBalanced::queueRequest(Request *request)
+{
+	queueCount_++;
+	if (queueCount_ > captureLimit_)
+		return 0;
+
+	return camera_->queueRequest(request);
+}
+
+void SimpleCaptureBalanced::requestComplete(Request *request)
+{
+	captureCount_++;
+	if (captureCount_ >= captureLimit_) {
+		loop_->exit(0);
+		return;
+	}
+
+	request->reuse(Request::ReuseBuffers);
+	if (queueRequest(request))
+		loop_->exit(-EINVAL);
+}
diff --git a/src/lc-compliance/simple_capture.h b/src/lc-compliance/simple_capture.h
new file mode 100644
index 00000000..3a6afc53
--- /dev/null
+++ b/src/lc-compliance/simple_capture.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * simple_capture.h - Simple capture helper
+ */
+#ifndef __LC_COMPLIANCE_SIMPLE_CAPTURE_H__
+#define __LC_COMPLIANCE_SIMPLE_CAPTURE_H__
+
+#include <memory>
+
+#include <libcamera/libcamera.h>
+
+#include "../cam/event_loop.h"
+#include "results.h"
+
+class SimpleCapture
+{
+public:
+	Results::Result configure(libcamera::StreamRole role);
+
+protected:
+	SimpleCapture(std::shared_ptr<libcamera::Camera> camera);
+	virtual ~SimpleCapture();
+
+	Results::Result start();
+	Results::Result stop();
+
+	virtual void requestComplete(libcamera::Request *request) = 0;
+
+	EventLoop *loop_;
+
+	std::shared_ptr<libcamera::Camera> camera_;
+	std::unique_ptr<libcamera::FrameBufferAllocator> allocator_;
+	std::unique_ptr<libcamera::CameraConfiguration> config_;
+};
+
+class SimpleCaptureBalanced : public SimpleCapture
+{
+public:
+	SimpleCaptureBalanced(std::shared_ptr<libcamera::Camera> camera);
+
+	Results::Result capture(unsigned int numRequests);
+
+private:
+	int queueRequest(libcamera::Request *request);
+	void requestComplete(libcamera::Request *request) override;
+
+	unsigned int queueCount_;
+	unsigned int captureCount_;
+	unsigned int captureLimit_;
+};
+
+#endif /* __LC_COMPLIANCE_SIMPLE_CAPTURE_H__ */
diff --git a/src/lc-compliance/single_stream.cpp b/src/lc-compliance/single_stream.cpp
new file mode 100644
index 00000000..e9ca1d58
--- /dev/null
+++ b/src/lc-compliance/single_stream.cpp
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * single_stream.cpp - Test a single camera stream
+ */
+
+#include <iostream>
+
+#include "simple_capture.h"
+#include "tests.h"
+
+using namespace libcamera;
+
+Results::Result testRequestBalance(std::shared_ptr<Camera> camera,
+				   StreamRole role, unsigned int startCycles,
+				   unsigned int numRequests)
+{
+	SimpleCaptureBalanced capture(camera);
+
+	Results::Result ret = capture.configure(role);
+	if (ret.first != Results::Pass)
+		return ret;
+
+	for (unsigned int starts = 0; starts < startCycles; starts++) {
+		ret = capture.capture(numRequests);
+		if (ret.first != Results::Pass)
+			return ret;
+	}
+
+	return { Results::Pass, "Balanced capture of " +
+		std::to_string(numRequests) + " requests with " +
+		std::to_string(startCycles) + " start cycles" };
+}
+
+Results testSingleStream(std::shared_ptr<Camera> camera)
+{
+	static const std::vector<std::pair<std::string, StreamRole>> roles = {
+		{ "raw", Raw },
+		{ "still", StillCapture },
+		{ "video", VideoRecording },
+		{ "viewfinder", Viewfinder },
+	};
+	static const std::vector<unsigned int> numRequests = { 1, 2, 3, 5, 8, 13, 21, 34, 55, 89 };
+
+	Results results(numRequests.size() * roles.size() * 2);
+
+	for (const auto &role : roles) {
+		std::cout << "= Test role " << role.first << std::endl;
+		/*
+		 * Test single capture cycles
+		 *
+		 * Makes sure the camera completes the exact number of requests queued.
+		 * Example failure is a camera that needs N+M requests queued to
+		 * complete N requests to the application.
+		 */
+		std::cout << "* Test single capture cycles" << std::endl;
+		for (unsigned int num : numRequests)
+			results.add(testRequestBalance(camera, role.second, 1, num));
+
+		/*
+		 * Test multiple start/stop cycles
+		 *
+		 * Makes sure the camera supports multiple start/stop cycles.
+		 * Example failure is a camera that does not clean up correctly in its
+		 * error path but is only tested by single-capture applications.
+		 */
+		std::cout << "* Test multiple start/stop cycles" << std::endl;
+		for (unsigned int num : numRequests)
+			results.add(testRequestBalance(camera, role.second, 3, num));
+	}
+
+	return results;
+}
diff --git a/src/lc-compliance/tests.h b/src/lc-compliance/tests.h
new file mode 100644
index 00000000..39660521
--- /dev/null
+++ b/src/lc-compliance/tests.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * tests.h - Test modules
+ */
+#ifndef __LC_COMPLIANCE_TESTS_H__
+#define __LC_COMPLIANCE_TESTS_H__
+
+#include <libcamera/libcamera.h>
+
+#include "results.h"
+
+Results testSingleStream(std::shared_ptr<libcamera::Camera> camera);
+
+#endif /* __LC_COMPLIANCE_TESTS_H__ */
diff --git a/src/meson.build b/src/meson.build
index 8c1c8763..29ad2d33 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -21,6 +21,8 @@ subdir('android')
 subdir('libcamera')
 subdir('ipa')
 
+subdir('lc-compliance')
+
 subdir('cam')
 subdir('qcam')