libcamera: pipeline: rkisp1: Remove Timeline

There are no users left of the Timeline and there is no longer a need to
keep emulating a start of exposure event as the CSI-2 resciver reports
it. Remove the Timeline helper and what's left of it's integration in
the pipeline.

There is no functional change as nothing i the pipeline uses the
Timeline.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 0 insertions, 227 deletions

diff --git a/src/libcamera/pipeline/rkisp1/timeline.cpp b/src/libcamera/pipeline/rkisp1/timeline.cpp
deleted file mode 100644
index 6b83bbe5..00000000
--- a/src/libcamera/pipeline/rkisp1/timeline.cpp
+++ /dev/null
@@ -1,227 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-/*
- * Copyright (C) 2019, Google Inc.
- *
- * timeline.cpp - Timeline for per-frame control
- */
-
-#include "timeline.h"
-
-#include "libcamera/internal/log.h"
-
-/**
- * \file timeline.h
- * \brief Timeline for per-frame control
- */
-
-namespace libcamera {
-
-LOG_DEFINE_CATEGORY(Timeline)
-
-/**
- * \class FrameAction
- * \brief Action that can be schedule on a Timeline
- *
- * A frame action is an event schedule to be executed on a Timeline. A frame
- * action has two primal attributes a frame number and a type.
- *
- * The frame number describes the frame to which the action is associated. The
- * type is a numerical ID which identifies the action within the pipeline and
- * IPA protocol.
- */
-
-/**
- * \class Timeline
- * \brief Executor of FrameAction
- *
- * The timeline has three primary functions:
- *
- * 1. Keep track of the Start of Exposure (SOE) for every frame processed by
- *    the hardware. Using this information it shall keep an up-to-date estimate
- *    of the frame interval (time between two consecutive SOE events).
- *
- *    The estimated frame interval together with recorded SOE events are the
- *    foundation for how the timeline schedule FrameAction at specific points
- *    in time.
- *    \todo Improve the frame interval estimation algorithm.
- *
- * 2. Keep track of current delays for different types of actions. The delays
- *    for different actions might differ during a capture session. Exposure time
- *    effects the over all FPS and different ISP parameters might impacts its
- *    processing time.
- *
- *    The action type delays shall be updated by the IPA in conjunction with
- *    how it changes the capture parameters.
- *
- * 3. Schedule actions on the timeline. This is the process of taking a
- *    FrameAction which contains an abstract description of what frame and
- *    what type of action it contains and turning that into an time point
- *    and make sure the action is executed at that time.
- */
-
-Timeline::Timeline()
-	: frameInterval_(0)
-{
-	timer_.timeout.connect(this, &Timeline::timeout);
-}
-
-/**
- * \brief Reset and stop the timeline
- *
- * The timeline needs to be reset when the timeline should no longer execute
- * actions. A timeline should be reset between two capture sessions to prevent
- * the old capture session to effect the second one.
- */
-void Timeline::reset()
-{
-	timer_.stop();
-
-	actions_.clear();
-	history_.clear();
-}
-
-/**
- * \brief Schedule an action on the timeline
- * \param[in] action FrameAction to schedule
- *
- * The act of scheduling an action to the timeline is the process of taking
- * the properties of the action (type, frame and time offsets) and translating
- * that to a time point using the current values for the action type timings
- * value recorded in the timeline. If an action is scheduled too late, execute
- * it immediately.
- */
-void Timeline::scheduleAction(std::unique_ptr<FrameAction> action)
-{
-	unsigned int lastFrame;
-	utils::time_point lastTime;
-
-	if (history_.empty()) {
-		lastFrame = 0;
-		lastTime = std::chrono::steady_clock::now();
-	} else {
-		lastFrame = history_.back().first;
-		lastTime = history_.back().second;
-	}
-
-	/*
-	 * Calculate when the action shall be schedule by first finding out how
-	 * many frames in the future the action acts on and then add the actions
-	 * frame offset. After the spatial frame offset is found out translate
-	 * that to a time point by using the last estimated start of exposure
-	 * (SOE) as the fixed offset. Lastly add the action time offset to the
-	 * time point.
-	 */
-	int frame = action->frame() - lastFrame + frameOffset(action->type());
-	utils::time_point deadline = lastTime + frame * frameInterval_
-		+ timeOffset(action->type());
-
-	utils::time_point now = std::chrono::steady_clock::now();
-	if (deadline < now) {
-		LOG(Timeline, Warning)
-			<< "Action scheduled too late "
-			<< utils::time_point_to_string(deadline)
-			<< ", run now " << utils::time_point_to_string(now);
-		action->run();
-	} else {
-		actions_.emplace(deadline, std::move(action));
-		updateDeadline();
-	}
-}
-
-void Timeline::notifyStartOfExposure(unsigned int frame, utils::time_point time)
-{
-	history_.push_back(std::make_pair(frame, time));
-
-	if (history_.size() <= HISTORY_DEPTH / 2)
-		return;
-
-	while (history_.size() > HISTORY_DEPTH)
-		history_.pop_front();
-
-	/* Update esitmated time between two start of exposures. */
-	utils::duration sumExposures(0);
-	unsigned int numExposures = 0;
-
-	utils::time_point lastTime;
-	for (auto it = history_.begin(); it != history_.end(); it++) {
-		if (it != history_.begin()) {
-			sumExposures += it->second - lastTime;
-			numExposures++;
-		}
-
-		lastTime = it->second;
-	}
-
-	frameInterval_ = sumExposures;
-	if (numExposures)
-		frameInterval_ /= numExposures;
-}
-
-int Timeline::frameOffset(unsigned int type) const
-{
-	const auto it = delays_.find(type);
-	if (it == delays_.end()) {
-		LOG(Timeline, Error)
-			<< "No frame offset set for action type " << type;
-		return 0;
-	}
-
-	return it->second.first;
-}
-
-utils::duration Timeline::timeOffset(unsigned int type) const
-{
-	const auto it = delays_.find(type);
-	if (it == delays_.end()) {
-		LOG(Timeline, Error)
-			<< "No time offset set for action type " << type;
-		return utils::duration::zero();
-	}
-
-	return it->second.second;
-}
-
-void Timeline::setRawDelay(unsigned int type, int frame, utils::duration time)
-{
-	delays_[type] = std::make_pair(frame, time);
-}
-
-void Timeline::updateDeadline()
-{
-	if (actions_.empty())
-		return;
-
-	const utils::time_point &deadline = actions_.begin()->first;
-
-	if (timer_.isRunning() && deadline >= timer_.deadline())
-		return;
-
-	if (deadline <= std::chrono::steady_clock::now()) {
-		timeout(&timer_);
-		return;
-	}
-
-	timer_.start(deadline);
-}
-
-void Timeline::timeout([[maybe_unused]] Timer *timer)
-{
-	utils::time_point now = std::chrono::steady_clock::now();
-
-	for (auto it = actions_.begin(); it != actions_.end();) {
-		const utils::time_point &sched = it->first;
-
-		if (sched > now)
-			break;
-
-		FrameAction *action = it->second.get();
-
-		action->run();
-
-		it = actions_.erase(it);
-	}
-
-	updateDeadline();
-}
-
-} /* namespace libcamera */