{"id":12491,"url":"https://patchwork.libcamera.org/api/1.1/patches/12491/?format=json","web_url":"https://patchwork.libcamera.org/patch/12491/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/1.1/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20210602152122.14836-3-david.plowman@raspberrypi.com>","date":"2021-06-02T15:21:22","name":"[libcamera-devel,v2,2/2] ipa: raspberrypi: AGC: handle modes with different sensitivities","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"56fd02fe340f2c9670ce3289fec15b5710c25de4","submitter":{"id":42,"url":"https://patchwork.libcamera.org/api/1.1/people/42/?format=json","name":"David Plowman","email":"david.plowman@raspberrypi.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/12491/mbox/","series":[{"id":2102,"url":"https://patchwork.libcamera.org/api/1.1/series/2102/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=2102","date":"2021-06-02T15:21:20","name":"Raspberrypi: support per-mode camera sensitivities","version":2,"mbox":"https://patchwork.libcamera.org/series/2102/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/12491/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/12491/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 7FCD7C3209\n\tfor ;\n\tWed, 2 Jun 2021 15:21:30 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id CB3326892D;\n\tWed, 2 Jun 2021 17:21:28 +0200 (CEST)","from mail-wm1-x330.google.com (mail-wm1-x330.google.com\n\t[IPv6:2a00:1450:4864:20::330])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 50362602AF\n\tfor ;\n\tWed, 2 Jun 2021 17:21:27 +0200 (CEST)","by mail-wm1-x330.google.com with SMTP id\n\tp13-20020a05600c358db029019f44afc845so1900113wmq.3\n\tfor ;\n\tWed, 02 Jun 2021 08:21:27 -0700 (PDT)","from pi4-davidp.lan (plowpeople3.plus.com. [80.229.223.72])\n\tby smtp.gmail.com with ESMTPSA id p1sm57044wmc.11.2021.06.02.08.21.26\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tWed, 02 Jun 2021 08:21:26 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=raspberrypi.com header.i=@raspberrypi.com\n\theader.b=\"naJpCNqn\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=raspberrypi.com; s=google;\n\th=from:to:cc:subject:date:message-id:in-reply-to:references\n\t:mime-version:content-transfer-encoding;\n\tbh=/68s40iRMrqonldzS1duTI3qAQU2QsASwzXb6nw6uwQ=;\n\tb=naJpCNqnwP1Rufj3fDk1QFbA/094uAWw49JiCGxGT6vH3+79/VaK5ZRR3cbfLZkIXM\n\t9JVTMrSLfJsOvuDh8wb5tw0rpzHyGFvZmsyAWkdq8K7AjwGXI/M8oeQqF4yQLCwWO++p\n\tYMkNIoOBZDbZaXy4BKJ5sPZhQbIas11k4yaA8C5uUdPN9N6T3hkqWNgYaW0VPe5qtdKr\n\tkOFyKvrfB0cC4KSeorr0vRg1lhzCUWCZRVi5A3/wlv1I8gbkPWDVy+IYtbvwuRGtS6iv\n\t3HT9m8XUARLZTSmw29fJm+w1AAuf/d5ApJREyebdtr3pFJDTvS54I+Y2aPjmeYHNJdIj\n\tI1PA==","X-Google-DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=1e100.net; s=20161025;\n\th=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to\n\t:references:mime-version:content-transfer-encoding;\n\tbh=/68s40iRMrqonldzS1duTI3qAQU2QsASwzXb6nw6uwQ=;\n\tb=iv8fRdCIJCsMTHqHXzUseZ9g0ZkkSJyZGFqlZMoBMMB4kitWuXDnl6BAre6MJ0PelQ\n\tR3NxohIS1IsJSTQ766+mvCCr0Z5s86OV62NBbgcW3WZXFoVdQOt1T93VHXjAvNmjjiQo\n\tS089T758b+avySDLMurKSvla7PRXbWO3aV5BAkriyvlzh6Wy0gAnodIUIxM42l45FrWo\n\t3mvpeMv6PYzMFxuYSQ5Clo/8HxgcmfIrHAS4ZsSp5Cdy/OlV4o1/0iScjiPkiBhJzsl+\n\tKDUDYgr+KU+6BfstRXwehjParyWACoVXVCOwjdekEu8u2ifGFm7DhfGkmfgnccJaMRu4\n\tCuhQ==","X-Gm-Message-State":"AOAM530Bw/aqL7335SRvEeKvTj7FKQLNdn8G7GqhmtMjpSTXftNK8aRj\n\tbh0V3Ou0KwUmQ9CILBS6yI2fVPaWhfM7yNL0","X-Google-Smtp-Source":"ABdhPJywsj/9e4IcE6FaabRvjdlo0huX/p2yDyDxSB9MKAC9uxWhdfxTPgPm6JhkAgoe9bI2I3B1sw==","X-Received":"by 2002:a7b:c44f:: with SMTP id\n\tl15mr5809899wmi.151.1622647286906; \n\tWed, 02 Jun 2021 08:21:26 -0700 (PDT)","From":"David Plowman ","To":"libcamera-devel@lists.libcamera.org","Date":"Wed, 2 Jun 2021 16:21:22 +0100","Message-Id":"<20210602152122.14836-3-david.plowman@raspberrypi.com>","X-Mailer":"git-send-email 2.20.1","In-Reply-To":"<20210602152122.14836-1-david.plowman@raspberrypi.com>","References":"<20210602152122.14836-1-david.plowman@raspberrypi.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH v2 2/2] ipa: raspberrypi: AGC: handle\n\tmodes with different sensitivities","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"When the sensor is switched to a mode with a different sensitivity,\nthe target exposure values need to be adjusted proportionately to\nmaintain the same image brightness.\n\nSigned-off-by: David Plowman \nReviewed-by: Naushir Patuck \n---\n src/ipa/raspberrypi/controller/rpi/agc.cpp | 25 +++++++++++++++++-----\n src/ipa/raspberrypi/controller/rpi/agc.hpp | 1 +\n 2 files changed, 21 insertions(+), 5 deletions(-)","diff":"diff --git a/src/ipa/raspberrypi/controller/rpi/agc.cpp b/src/ipa/raspberrypi/controller/rpi/agc.cpp\nindex f4cd5d26..6f0e9702 100644\n--- a/src/ipa/raspberrypi/controller/rpi/agc.cpp\n+++ b/src/ipa/raspberrypi/controller/rpi/agc.cpp\n@@ -155,7 +155,7 @@ Agc::Agc(Controller *controller)\n \t: AgcAlgorithm(controller), metering_mode_(nullptr),\n \t exposure_mode_(nullptr), constraint_mode_(nullptr),\n \t frame_count_(0), lock_count_(0),\n-\t last_target_exposure_(0.0),\n+\t last_target_exposure_(0.0), last_sensitivity_(0.0),\n \t ev_(1.0), flicker_period_(0.0),\n \t max_shutter_(0), fixed_shutter_(0), fixed_analogue_gain_(0.0)\n {\n@@ -261,7 +261,7 @@ void Agc::SetConstraintMode(std::string const &constraint_mode_name)\n \tconstraint_mode_name_ = constraint_mode_name;\n }\n \n-void Agc::SwitchMode([[maybe_unused]] CameraMode const &camera_mode,\n+void Agc::SwitchMode(CameraMode const &camera_mode,\n \t\t Metadata *metadata)\n {\n \thousekeepConfig();\n@@ -285,9 +285,20 @@ void Agc::SwitchMode([[maybe_unused]] CameraMode const &camera_mode,\n \t\tfiltered_.shutter = fixed_shutter;\n \t\tfiltered_.analogue_gain = fixed_analogue_gain_;\n \t} else if (status_.total_exposure_value) {\n-\t\t// On a mode switch, it's possible the exposure profile could change,\n-\t\t// or a fixed exposure/gain might be set so we divide up the exposure/\n-\t\t// gain again, but we don't change any target values.\n+\t\t// On a mode switch, various things could happen:\n+\t\t// - the exposure profile might change\n+\t\t// - a fixed exposure or gain might be set\n+\t\t// - the new mode's sensitivity might be different\n+\t\t// We cope with the last of these by scaling the target values. After\n+\t\t// that we just need to re-divide the exposure/gain according to the\n+\t\t// current exposure profile, which takes care of everything else.\n+\n+\t\tdouble ratio = last_sensitivity_ / camera_mode.sensitivity;\n+\t\ttarget_.total_exposure_no_dg *= ratio;\n+\t\ttarget_.total_exposure *= ratio;\n+\t\tfiltered_.total_exposure_no_dg *= ratio;\n+\t\tfiltered_.total_exposure *= ratio;\n+\n \t\tdivideUpExposure();\n \t} else {\n \t\t// We come through here on startup, when at least one of the shutter\n@@ -301,6 +312,10 @@ void Agc::SwitchMode([[maybe_unused]] CameraMode const &camera_mode,\n \t}\n \n \twriteAndFinish(metadata, false);\n+\n+\t// We must remember the sensitivity of this mode for the next SwitchMode.\n+\tASSERT(camera_mode.sensitivity != 0.0);\n+\tlast_sensitivity_ = camera_mode.sensitivity;\n }\n \n void Agc::Prepare(Metadata *image_metadata)\ndiff --git a/src/ipa/raspberrypi/controller/rpi/agc.hpp b/src/ipa/raspberrypi/controller/rpi/agc.hpp\nindex 0427fb59..025878a2 100644\n--- a/src/ipa/raspberrypi/controller/rpi/agc.hpp\n+++ b/src/ipa/raspberrypi/controller/rpi/agc.hpp\n@@ -122,6 +122,7 @@ private:\n \tint lock_count_;\n \tDeviceStatus last_device_status_;\n \tdouble last_target_exposure_;\n+\tdouble last_sensitivity_; // sensitivity of the previous camera mode\n \t// Below here the \"settings\" that applications can change.\n \tstd::string metering_mode_name_;\n \tstd::string exposure_mode_name_;\n","prefixes":["libcamera-devel","v2","2/2"]}