libcamera: ipa: rkisp1: Add basic control of auto exposure
Add an IPA which controls the exposure time and analog gain for a sensor connected to the rkisp1 pipeline. The IPA supports turning AE on and off and informing the camera of the status of the AE control loop. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Niklas Söderlund
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4 changed files with 281 additions and 0 deletions
254
src/ipa/rkisp1/rkisp1.cpp
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254
src/ipa/rkisp1/rkisp1.cpp
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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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* rkisp1.cpp - RkISP1 Image Processing Algorithms
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*/
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#include <algorithm>
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#include <cstdint>
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#include <math.h>
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#include <queue>
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#include <string.h>
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#include <linux/rkisp1-config.h>
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#include <ipa/ipa_interface.h>
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#include <ipa/ipa_module_info.h>
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#include <ipa/rkisp1.h>
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#include <libcamera/buffer.h>
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#include <libcamera/control_ids.h>
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#include <libcamera/request.h>
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#include "log.h"
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#include "utils.h"
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namespace libcamera {
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LOG_DEFINE_CATEGORY(IPARkISP1)
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class IPARkISP1 : public IPAInterface
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{
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public:
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int init() override { return 0; }
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void configure(const std::map<unsigned int, IPAStream> &streamConfig,
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const std::map<unsigned int, V4L2ControlInfoMap> &entityControls) override;
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void mapBuffers(const std::vector<IPABuffer> &buffers) override;
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void unmapBuffers(const std::vector<unsigned int> &ids) override;
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void processEvent(const IPAOperationData &event) override;
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private:
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void queueRequest(unsigned int frame, rkisp1_isp_params_cfg *params,
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const ControlList &controls);
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void updateStatistics(unsigned int frame,
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const rkisp1_stat_buffer *stats);
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void setControls(unsigned int frame);
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void metadataReady(unsigned int frame, unsigned int aeState);
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std::map<unsigned int, BufferMemory> bufferInfo_;
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/* Camera sensor controls. */
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bool autoExposure_;
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uint32_t exposure_;
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uint32_t minExposure_;
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uint32_t maxExposure_;
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uint32_t gain_;
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uint32_t minGain_;
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uint32_t maxGain_;
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};
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void IPARkISP1::configure(const std::map<unsigned int, IPAStream> &streamConfig,
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const std::map<unsigned int, V4L2ControlInfoMap> &entityControls)
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{
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if (entityControls.empty())
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return;
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const V4L2ControlInfoMap &ctrls = entityControls.at(0);
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const auto itExp = ctrls.find(V4L2_CID_EXPOSURE);
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if (itExp == ctrls.end()) {
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LOG(IPARkISP1, Error) << "Can't find exposure control";
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return;
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}
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const auto itGain = ctrls.find(V4L2_CID_ANALOGUE_GAIN);
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if (itGain == ctrls.end()) {
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LOG(IPARkISP1, Error) << "Can't find gain control";
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return;
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}
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autoExposure_ = true;
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minExposure_ = std::max<uint32_t>(itExp->second.range().min().get<int32_t>(), 1);
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maxExposure_ = itExp->second.range().max().get<int32_t>();
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exposure_ = minExposure_;
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minGain_ = std::max<uint32_t>(itGain->second.range().min().get<int32_t>(), 1);
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maxGain_ = itGain->second.range().max().get<int32_t>();
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gain_ = minGain_;
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LOG(IPARkISP1, Info)
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<< "Exposure: " << minExposure_ << "-" << maxExposure_
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<< " Gain: " << minGain_ << "-" << maxGain_;
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setControls(0);
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}
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void IPARkISP1::mapBuffers(const std::vector<IPABuffer> &buffers)
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{
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for (IPABuffer buffer : buffers) {
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bufferInfo_[buffer.id] = buffer.memory;
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bufferInfo_[buffer.id].planes()[0].mem();
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}
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}
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void IPARkISP1::unmapBuffers(const std::vector<unsigned int> &ids)
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{
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for (unsigned int id : ids)
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bufferInfo_.erase(id);
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}
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void IPARkISP1::processEvent(const IPAOperationData &event)
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{
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switch (event.operation) {
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case RKISP1_IPA_EVENT_SIGNAL_STAT_BUFFER: {
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unsigned int frame = event.data[0];
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unsigned int bufferId = event.data[1];
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const rkisp1_stat_buffer *stats =
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static_cast<rkisp1_stat_buffer *>(bufferInfo_[bufferId].planes()[0].mem());
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updateStatistics(frame, stats);
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break;
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}
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case RKISP1_IPA_EVENT_QUEUE_REQUEST: {
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unsigned int frame = event.data[0];
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unsigned int bufferId = event.data[1];
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rkisp1_isp_params_cfg *params =
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static_cast<rkisp1_isp_params_cfg *>(bufferInfo_[bufferId].planes()[0].mem());
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queueRequest(frame, params, event.controls[0]);
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break;
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}
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default:
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LOG(IPARkISP1, Error) << "Unkown event " << event.operation;
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break;
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}
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}
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void IPARkISP1::queueRequest(unsigned int frame, rkisp1_isp_params_cfg *params,
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const ControlList &controls)
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{
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/* Prepare parameters buffer. */
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memset(params, 0, sizeof(*params));
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/* Auto Exposure on/off. */
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if (controls.contains(controls::AeEnable)) {
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autoExposure_ = controls.get(controls::AeEnable);
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if (autoExposure_)
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params->module_ens = CIFISP_MODULE_AEC;
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params->module_en_update = CIFISP_MODULE_AEC;
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}
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IPAOperationData op;
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op.operation = RKISP1_IPA_ACTION_PARAM_FILLED;
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queueFrameAction.emit(frame, op);
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}
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void IPARkISP1::updateStatistics(unsigned int frame,
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const rkisp1_stat_buffer *stats)
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{
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const cifisp_stat *params = &stats->params;
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unsigned int aeState = 0;
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if (stats->meas_type & CIFISP_STAT_AUTOEXP) {
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const cifisp_ae_stat *ae = ¶ms->ae;
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const unsigned int target = 60;
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unsigned int value = 0;
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unsigned int num = 0;
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for (int i = 0; i < CIFISP_AE_MEAN_MAX; i++) {
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if (ae->exp_mean[i] <= 15)
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continue;
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value += ae->exp_mean[i];
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num++;
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}
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value /= num;
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double factor = (double)target / value;
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if (frame % 3 == 0) {
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double exposure;
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exposure = factor * exposure_ * gain_ / minGain_;
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exposure_ = utils::clamp<uint64_t>((uint64_t)exposure,
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minExposure_,
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maxExposure_);
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exposure = exposure / exposure_ * minGain_;
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gain_ = utils::clamp<uint64_t>((uint64_t)exposure,
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minGain_, maxGain_);
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setControls(frame + 1);
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}
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aeState = fabs(factor - 1.0f) < 0.05f ? 2 : 1;
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}
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metadataReady(frame, aeState);
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}
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void IPARkISP1::setControls(unsigned int frame)
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{
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IPAOperationData op;
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op.operation = RKISP1_IPA_ACTION_V4L2_SET;
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V4L2ControlList ctrls;
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ctrls.add(V4L2_CID_EXPOSURE, exposure_);
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ctrls.add(V4L2_CID_ANALOGUE_GAIN, gain_);
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op.v4l2controls.push_back(ctrls);
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queueFrameAction.emit(frame, op);
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}
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void IPARkISP1::metadataReady(unsigned int frame, unsigned int aeState)
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{
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ControlList ctrls(nullptr);
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if (aeState)
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ctrls.set(controls::AeLocked, aeState == 2);
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IPAOperationData op;
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op.operation = RKISP1_IPA_ACTION_METADATA;
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op.controls.push_back(ctrls);
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queueFrameAction.emit(frame, op);
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}
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/*
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* External IPA module interface
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*/
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extern "C" {
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const struct IPAModuleInfo ipaModuleInfo = {
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IPA_MODULE_API_VERSION,
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1,
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"PipelineHandlerRkISP1",
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"RkISP1 IPA",
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"LGPL-2.1-or-later",
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};
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IPAInterface *ipaCreate()
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{
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return new IPARkISP1();
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}
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};
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}; /* namespace libcamera */
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