test/timer.cpp


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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * timer.cpp - Timer test
 */

#include <chrono>
#include <iostream>

#include <libcamera/base/event_dispatcher.h>
#include <libcamera/base/thread.h>
#include <libcamera/base/timer.h>

#include "test.h"

using namespace libcamera;
using namespace std;
using namespace std::chrono_literals;

class ManagedTimer : public Timer
{
public:
	ManagedTimer()
		: Timer(), count_(0)
	{
		timeout.connect(this, &ManagedTimer::timeoutHandler);
	}

	void start(std::chrono::milliseconds msec)
	{
		count_ = 0;
		start_ = std::chrono::steady_clock::now();
		expiration_ = std::chrono::steady_clock::time_point();

		Timer::start(msec);
	}

	void start(std::chrono::steady_clock::time_point deadline)
	{
		count_ = 0;
		start_ = std::chrono::steady_clock::now();
		expiration_ = std::chrono::steady_clock::time_point();

		Timer::start(deadline);
	}

	int jitter()
	{
		std::chrono::steady_clock::duration duration = expiration_ - deadline();
		return abs(std::chrono::duration_cast<std::chrono::milliseconds>(duration).count());
	}

	bool hasFailed()
	{
		return isRunning() || count_ != 1 || jitter() > 50;
	}

private:
	void timeoutHandler()
	{
		expiration_ = std::chrono::steady_clock::now();
		count_++;
	}

	unsigned int count_;
	std::chrono::steady_clock::time_point start_;
	std::chrono::steady_clock::time_point expiration_;
};

class TimerTest : public Test
{
protected:
	int init()
	{
		return 0;
	}

	int run()
	{
		EventDispatcher *dispatcher = Thread::current()->eventDispatcher();
		ManagedTimer timer;
		ManagedTimer timer2;

		/* Timer expiration. */
		timer.start(1000ms);

		if (!timer.isRunning()) {
			cout << "Timer expiration test failed" << endl;
			return TestFail;
		}

		dispatcher->processEvents();

		if (timer.hasFailed()) {
			cout << "Timer expiration test failed" << endl;
			return TestFail;
		}

		/*
		 * 32 bit wrap test
		 * Nanosecond resolution in a 32 bit value wraps at 4.294967
		 * seconds (0xFFFFFFFF / 1000000)
		 */
		timer.start(4295ms);
		dispatcher->processEvents();

		if (timer.hasFailed()) {
			cout << "Timer expiration test failed" << endl;
			return TestFail;
		}

		/* Timer restart. */
		timer.start(500ms);

		if (!timer.isRunning()) {
			cout << "Timer restart test failed" << endl;
			return TestFail;
		}

		dispatcher->processEvents();

		if (timer.hasFailed()) {
			cout << "Timer restart test failed" << endl;
			return TestFail;
		}

		/* Timer restart before expiration. */
		timer.start(50ms);
		timer.start(100ms);
		timer.start(150ms);

		dispatcher->processEvents();

		if (timer.hasFailed()) {
			cout << "Timer restart before expiration test failed" << endl;
			return TestFail;
		}

		/* Timer with absolute deadline. */
		timer.start(std::chrono::steady_clock::now() + std::chrono::milliseconds(200));

		dispatcher->processEvents();

		if (timer.hasFailed()) {
			cout << "Absolute deadline test failed" << endl;
			return TestFail;
		}

		/* Two timers. */
		timer.start(1000ms);
		timer2.start(300ms);

		dispatcher->processEvents();

		if (!timer.isRunning()) {
			cout << "Two timers test failed" << endl;
			return TestFail;
		}

		if (timer2.jitter() > 50) {
			cout << "Two timers test failed" << endl;
			return TestFail;
		}

		dispatcher->processEvents();

		if (timer.jitter() > 50) {
			cout << "Two timers test failed" << endl;
			return TestFail;
		}

		/* Restart timer before expiration. */
		timer.start(1000ms);
		timer2.start(300ms);

		dispatcher->processEvents();

		if (timer2.jitter() > 50) {
			cout << "Two timers test failed" << endl;
			return TestFail;
		}

		timer.start(1000ms);

		dispatcher->processEvents();

		if (timer.jitter() > 50) {
			cout << "Two timers test failed" << endl;
			return TestFail;
		}

		/*
		 * Test that dynamically allocated timers are stopped when
		 * deleted. This will result in a crash on failure.
		 */
		ManagedTimer *dyntimer = new ManagedTimer();
		dyntimer->start(100ms);
		delete dyntimer;

		timer.start(200ms);
		dispatcher->processEvents();

		return TestPass;
	}

	void cleanup()
	{
	}
};

TEST_REGISTER(TimerTest)
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Collabora Ltd.
 *     Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
 *
 * GStreamer Capture Element
 */

/**
 * \todo The following is a list of items that needs implementation in the GStreamer plugin
 *  - Implement GstElement::send_event
 *    + Allowing application to use FLUSH/FLUSH_STOP
 *    + Prevent the main thread from accessing streaming thread
 *  - Implement GstElement::request-new-pad (multi stream)
 *    + Evaluate if a single streaming thread is fine
 *  - Add application driven request (snapshot)
 *  - Add framerate control
 *  - Add buffer importation support
 *
 *  Requires new libcamera API:
 *  - Add framerate negotiation support
 *  - Add colorimetry support
 *  - Add timestamp support
 *  - Use unique names to select the camera devices
 *  - Add GstVideoMeta support (strides and offsets)
 */

#include "gstlibcamerasrc.h"

#include <atomic>
#include <queue>
#include <vector>

#include <libcamera/camera.h>
#include <libcamera/camera_manager.h>
#include <libcamera/control_ids.h>

#include <gst/base/base.h>

#include "gstlibcameraallocator.h"
#include "gstlibcamerapad.h"
#include "gstlibcamerapool.h"
#include "gstlibcamera-utils.h"

using namespace libcamera;

GST_DEBUG_CATEGORY_STATIC(source_debug);
#define GST_CAT_DEFAULT source_debug

struct RequestWrap {
	RequestWrap(std::unique_ptr<Request> request);
	~RequestWrap();

	void attachBuffer(Stream *stream, GstBuffer *buffer);
	GstBuffer *detachBuffer(Stream *stream);

	std::unique_ptr<Request> request_;
	std::map<Stream *, GstBuffer *> buffers_;

	GstClockTime latency_;
	GstClockTime pts_;
};

RequestWrap::RequestWrap(std::unique_ptr<Request> request)
	: request_(std::move(request)), latency_(0), pts_(GST_CLOCK_TIME_NONE)
{
}

RequestWrap::~RequestWrap()
{
	for (std::pair<Stream *const, GstBuffer *> &item : buffers_) {
		if (item.second)
			gst_buffer_unref(item.second);
	}
}

void RequestWrap::attachBuffer(Stream *stream, GstBuffer *buffer)
{
	FrameBuffer *fb = gst_libcamera_buffer_get_frame_buffer(buffer);

	request_->addBuffer(stream, fb);

	auto item = buffers_.find(stream);
	if (item != buffers_.end()) {
		gst_buffer_unref(item->second);
		item->second = buffer;
	} else {
		buffers_[stream] = buffer;
	}
}

GstBuffer *RequestWrap::detachBuffer(Stream *stream)
{
	GstBuffer *buffer = nullptr;

	auto item = buffers_.find(stream);
	if (item != buffers_.end()) {
		buffer = item->second;
		item->second = nullptr;
	}

	return buffer;
}

/* Used for C++ object with destructors. */
struct GstLibcameraSrcState {
	GstLibcameraSrc *src_;

	std::shared_ptr<CameraManager> cm_;
	std::shared_ptr<Camera> cam_;
	std::unique_ptr<CameraConfiguration> config_;

	std::vector<GstPad *> srcpads_; /* Protected by stream_lock */

	/*
	 * Contention on this lock_ must be minimized, as it has to be taken in
	 * the realtime-sensitive requestCompleted() handler to protect
	 * queuedRequests_ and completedRequests_.
	 *
	 * stream_lock must be taken before lock_ in contexts where both locks
	 * need to be taken. In particular, this means that the lock_ must not
	 * be held while calling into other graph elements (e.g. when calling
	 * gst_pad_query()).
	 */
	GMutex lock_;
	std::queue<std::unique_ptr<RequestWrap>> queuedRequests_;
	std::queue<std::unique_ptr<RequestWrap>> completedRequests_;

	ControlList initControls_;
	guint group_id_;

	int queueRequest();
	void requestCompleted(Request *request);
	int processRequest();
	void clearRequests();
};

struct _GstLibcameraSrc {
	GstElement parent;

	GRecMutex stream_lock;
	GstTask *task;

	gchar *camera_name;
	controls::AfModeEnum auto_focus_mode = controls::AfModeManual;

	std::atomic<GstEvent *> pending_eos;

	GstLibcameraSrcState *state;
	GstLibcameraAllocator *allocator;
	GstFlowCombiner *flow_combiner;
};

enum {
	PROP_0,
	PROP_CAMERA_NAME,
	PROP_AUTO_FOCUS_MODE,
};

static void gst_libcamera_src_child_proxy_init(gpointer g_iface,
					       gpointer iface_data);

G_DEFINE_TYPE_WITH_CODE(GstLibcameraSrc, gst_libcamera_src, GST_TYPE_ELEMENT,
			G_IMPLEMENT_INTERFACE(GST_TYPE_CHILD_PROXY,
					      gst_libcamera_src_child_proxy_init)
			GST_DEBUG_CATEGORY_INIT(source_debug, "libcamerasrc", 0,
						"libcamera Source"))

#define TEMPLATE_CAPS GST_STATIC_CAPS("video/x-raw; image/jpeg; video/x-bayer")

/* For the simple case, we have a src pad that is always present. */
GstStaticPadTemplate src_template = {
	"src", GST_PAD_SRC, GST_PAD_ALWAYS, TEMPLATE_CAPS
};

/* More pads can be requested in state < PAUSED */
GstStaticPadTemplate request_src_template = {
	"src_%u", GST_PAD_SRC, GST_PAD_REQUEST, TEMPLATE_CAPS
};

/* Must be called with stream_lock held. */
int GstLibcameraSrcState::queueRequest()
{
	std::unique_ptr<Request> request = cam_->createRequest();
	if (!request)
		return -ENOMEM;

	std::unique_ptr<RequestWrap> wrap =
		std::make_unique<RequestWrap>(std::move(request));

	for (GstPad *srcpad : srcpads_) {
		Stream *stream = gst_libcamera_pad_get_stream(srcpad);
		GstLibcameraPool *pool = gst_libcamera_pad_get_pool(srcpad);
		GstBuffer *buffer;
		GstFlowReturn ret;

		ret = gst_buffer_pool_acquire_buffer(GST_BUFFER_POOL(pool),
						     &buffer, nullptr);
		if (ret != GST_FLOW_OK) {
			/*
			 * RequestWrap has ownership of the request, and we
			 * won't be queueing this one due to lack of buffers.
			 */
			return -ENOBUFS;
		}

		wrap->attachBuffer(stream, buffer);
	}

	GST_TRACE_OBJECT(src_, "Requesting buffers");
	cam_->queueRequest(wrap->request_.get());

	{
		GLibLocker locker(&lock_);
		queuedRequests_.push(std::move(wrap));
	}

	/* The RequestWrap will be deleted in the completion handler. */
	return 0;
}

void
GstLibcameraSrcState::requestCompleted(Request *request)
{
	GST_DEBUG_OBJECT(src_, "buffers are ready");

	std::unique_ptr<RequestWrap> wrap;

	{
		GLibLocker locker(&lock_);
		wrap = std::move(queuedRequests_.front());
		queuedRequests_.pop();
	}

	g_return_if_fail(wrap->request_.get() == request);

	if ((request->status() == Request::RequestCancelled)) {
		GST_DEBUG_OBJECT(src_, "Request was cancelled");
		return;
	}

	if (GST_ELEMENT_CLOCK(src_)) {
		int64_t timestamp = request->metadata().get(controls::SensorTimestamp).value_or(0);

		GstClockTime gst_base_time = GST_ELEMENT(src_)->base_time;
		GstClockTime gst_now = gst_clock_get_time(GST_ELEMENT_CLOCK(src_));
		/* \todo Need to expose which reference clock the timestamp relates to. */
		GstClockTime sys_now = g_get_monotonic_time() * 1000;

		/* Deduced from: sys_now - sys_base_time == gst_now - gst_base_time */
		GstClockTime sys_base_time = sys_now - (gst_now - gst_base_time);
		wrap->pts_ = timestamp - sys_base_time;
		wrap->latency_ = sys_now - timestamp;
	}

	{
		GLibLocker locker(&lock_);
		completedRequests_.push(std::move(wrap));
	}

	gst_task_resume(src_->task);
}

/* Must be called with stream_lock held. */
int GstLibcameraSrcState::processRequest()
{
	std::unique_ptr<RequestWrap> wrap;
	int err = 0;

	{
		GLibLocker locker(&lock_);

		if (!completedRequests_.empty()) {
			wrap = std::move(completedRequests_.front());
			completedRequests_.pop();
		}

		if (completedRequests_.empty())
			err = -ENOBUFS;
	}

	if (!wrap)
		return -ENOBUFS;

	GstFlowReturn ret = GST_FLOW_OK;
	gst_flow_combiner_reset(src_->flow_combiner);

	for (GstPad *srcpad : srcpads_) {
		Stream *stream = gst_libcamera_pad_get_stream(srcpad);
		GstBuffer *buffer = wrap->detachBuffer(stream);

		FrameBuffer *fb = gst_libcamera_buffer_get_frame_buffer(buffer);

		if (GST_CLOCK_TIME_IS_VALID(wrap->pts_)) {
			GST_BUFFER_PTS(buffer) = wrap->pts_;
			gst_libcamera_pad_set_latency(srcpad, wrap->latency_);
		} else {
			GST_BUFFER_PTS(buffer) = 0;
		}

		GST_BUFFER_OFFSET(buffer) = fb->metadata().sequence;
		GST_BUFFER_OFFSET_END(buffer) = fb->metadata().sequence;

		ret = gst_pad_push(srcpad, buffer);
		ret = gst_flow_combiner_update_pad_flow(src_->flow_combiner,
							srcpad, ret);
	}

	switch (ret) {
	case GST_FLOW_OK:
		break;

	case GST_FLOW_NOT_NEGOTIATED: {
		bool reconfigure = false;
		for (GstPad *srcpad : srcpads_) {
			if (gst_pad_needs_reconfigure(srcpad)) {
				reconfigure = true;
				break;
			}
		}

		/* If no pads need a reconfiguration something went wrong. */
		if (!reconfigure)
			err = -EPIPE;

		break;
	}

	case GST_FLOW_EOS: {
		g_autoptr(GstEvent) eos = gst_event_new_eos();
		guint32 seqnum = gst_util_seqnum_next();
		gst_event_set_seqnum(eos, seqnum);
		for (GstPad *srcpad : srcpads_)
			gst_pad_push_event(srcpad, gst_event_ref(eos));

		err = -EPIPE;
		break;
	}

	case GST_FLOW_FLUSHING:
		err = -EPIPE;
		break;

	default:
		GST_ELEMENT_FLOW_ERROR(src_, ret);

		err = -EPIPE;
		break;
	}

	return err;
}

void GstLibcameraSrcState::clearRequests()
{
	GLibLocker locker(&lock_);
	completedRequests_ = {};
}

static bool
gst_libcamera_src_open(GstLibcameraSrc *self)
{
	std::shared_ptr<CameraManager> cm;
	std::shared_ptr<Camera> cam;
	gint ret;

	GST_DEBUG_OBJECT(self, "Opening camera device ...");

	cm = gst_libcamera_get_camera_manager(ret);
	if (ret) {
		GST_ELEMENT_ERROR(self, LIBRARY, INIT,
				  ("Failed listing cameras."),
				  ("libcamera::CameraMananger::start() failed: %s", g_strerror(-ret)));
		return false;
	}

	g_autofree gchar *camera_name = nullptr;
	{
		GLibLocker lock(GST_OBJECT(self));
		if (self->camera_name)
			camera_name = g_strdup(self->camera_name);
	}

	if (camera_name) {
		cam = cm->get(camera_name);
		if (!cam) {
			GST_ELEMENT_ERROR(self, RESOURCE, NOT_FOUND,
					  ("Could not find a camera named '%s'.", camera_name),
					  ("libcamera::CameraMananger::get() returned nullptr"));
			return false;
		}
	} else {
		auto cameras = cm->cameras();
		if (cameras.empty()) {
			GST_ELEMENT_ERROR(self, RESOURCE, NOT_FOUND,
					  ("Could not find any supported camera on this system."),