libcamera: pipeline: rkisp1: Attach to an IPA
Add the plumbing to the pipeline handler to interact with an IPA module. This change makes the usage of an IPA module mandatory for the rkisp1 pipeline. The RkISP1 pipeline handler makes use of a timeline component to schedule actions. This might be useful for other pipeline handlers going forward so keep the generic timeline implementation separate to make it easy to break out. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Niklas Söderlund
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* timeline.cpp - Timeline for per-frame control
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*/
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#include "timeline.h"
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#include "log.h"
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/**
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* \file timeline.h
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* \brief Timeline for per-frame control
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*/
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namespace libcamera {
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LOG_DEFINE_CATEGORY(Timeline)
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/**
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* \class FrameAction
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* \brief Action that can be schedule on a Timeline
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*
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* A frame action is an event schedule to be executed on a Timeline. A frame
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* action has two primal attributes a frame number and a type.
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*
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* The frame number describes the frame to which the action is associated. The
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* type is a numerical ID which identifies the action within the pipeline and
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* IPA protocol.
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*/
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/**
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* \class Timeline
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* \brief Executor of FrameAction
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*
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* The timeline has three primary functions:
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*
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* 1. Keep track of the Start of Exposure (SOE) for every frame processed by
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* the hardware. Using this information it shall keep an up-to-date estimate
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* of the frame interval (time between two consecutive SOE events).
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*
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* The estimated frame interval together with recorded SOE events are the
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* foundation for how the timeline schedule FrameAction at specific points
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* in time.
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* \todo Improve the frame interval estimation algorithm.
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*
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* 2. Keep track of current delays for different types of actions. The delays
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* for different actions might differ during a capture session. Exposure time
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* effects the over all FPS and different ISP parameters might impacts its
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* processing time.
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*
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* The action type delays shall be updated by the IPA in conjunction with
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* how it changes the capture parameters.
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*
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* 3. Schedule actions on the timeline. This is the process of taking a
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* FrameAction which contains an abstract description of what frame and
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* what type of action it contains and turning that into an time point
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* and make sure the action is executed at that time.
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*/
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Timeline::Timeline()
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: frameInterval_(0)
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{
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timer_.timeout.connect(this, &Timeline::timeout);
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}
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/**
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* \brief Reset and stop the timeline
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*
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* The timeline needs to be reset when the timeline should no longer execute
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* actions. A timeline should be reset between two capture sessions to prevent
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* the old capture session to effect the second one.
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*/
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void Timeline::reset()
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{
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timer_.stop();
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actions_.clear();
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history_.clear();
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}
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/**
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* \brief Schedule an action on the timeline
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* \param[in] action FrameAction to schedule
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*
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* The act of scheduling an action to the timeline is the process of taking
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* the properties of the action (type, frame and time offsets) and translating
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* that to a time point using the current values for the action type timings
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* value recorded in the timeline. If an action is scheduled too late, execute
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* it immediately.
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*/
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void Timeline::scheduleAction(std::unique_ptr<FrameAction> action)
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{
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unsigned int lastFrame;
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utils::time_point lastTime;
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if (history_.empty()) {
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lastFrame = 0;
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lastTime = std::chrono::steady_clock::now();
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} else {
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lastFrame = history_.back().first;
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lastTime = history_.back().second;
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}
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/*
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* Calculate when the action shall be schedule by first finding out how
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* many frames in the future the action acts on and then add the actions
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* frame offset. After the spatial frame offset is found out translate
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* that to a time point by using the last estimated start of exposure
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* (SOE) as the fixed offset. Lastly add the action time offset to the
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* time point.
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*/
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int frame = action->frame() - lastFrame + frameOffset(action->type());
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utils::time_point deadline = lastTime + frame * frameInterval_
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+ timeOffset(action->type());
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utils::time_point now = std::chrono::steady_clock::now();
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if (deadline < now) {
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LOG(Timeline, Warning)
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<< "Action scheduled too late "
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<< utils::time_point_to_string(deadline)
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<< ", run now " << utils::time_point_to_string(now);
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action->run();
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} else {
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actions_.insert({ deadline, std::move(action) });
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updateDeadline();
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}
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}
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void Timeline::notifyStartOfExposure(unsigned int frame, utils::time_point time)
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{
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history_.push_back(std::make_pair(frame, time));
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if (history_.size() <= HISTORY_DEPTH / 2)
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return;
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while (history_.size() > HISTORY_DEPTH)
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history_.pop_front();
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/* Update esitmated time between two start of exposures. */
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utils::duration sumExposures(0);
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unsigned int numExposures = 0;
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utils::time_point lastTime;
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for (auto it = history_.begin(); it != history_.end(); it++) {
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if (it != history_.begin()) {
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sumExposures += it->second - lastTime;
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numExposures++;
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}
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lastTime = it->second;
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}
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frameInterval_ = sumExposures;
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if (numExposures)
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frameInterval_ /= numExposures;
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}
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int Timeline::frameOffset(unsigned int type) const
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{
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const auto it = delays_.find(type);
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if (it == delays_.end()) {
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LOG(Timeline, Error)
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<< "No frame offset set for action type " << type;
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return 0;
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}
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return it->second.first;
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}
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utils::duration Timeline::timeOffset(unsigned int type) const
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{
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const auto it = delays_.find(type);
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if (it == delays_.end()) {
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LOG(Timeline, Error)
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<< "No time offset set for action type " << type;
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return utils::duration::zero();
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}
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return it->second.second;
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}
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void Timeline::setRawDelay(unsigned int type, int frame, utils::duration time)
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{
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delays_[type] = std::make_pair(frame, time);
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}
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void Timeline::updateDeadline()
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{
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if (actions_.empty())
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return;
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const utils::time_point &deadline = actions_.begin()->first;
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if (timer_.isRunning() && deadline >= timer_.deadline())
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return;
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if (deadline <= std::chrono::steady_clock::now()) {
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timeout(&timer_);
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return;
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}
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timer_.start(deadline);
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}
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void Timeline::timeout(Timer *timer)
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{
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utils::time_point now = std::chrono::steady_clock::now();
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for (auto it = actions_.begin(); it != actions_.end();) {
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const utils::time_point &sched = it->first;
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if (sched > now)
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break;
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FrameAction *action = it->second.get();
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action->run();
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it = actions_.erase(it);
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}
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updateDeadline();
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}
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} /* namespace libcamera */
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