{"id":18195,"url":"https://patchwork.libcamera.org/api/patches/18195/?format=json","web_url":"https://patchwork.libcamera.org/patch/18195/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/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":"<20230125132018.5725-1-david.plowman@raspberrypi.com>","date":"2023-01-25T13:20:18","name":"[libcamera-devel] libcamera: controls: Add controls for AEC/AGC flicker avoidance","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"7a51b54b75bec738a7c6b40196c78415f03493d5","submitter":{"id":42,"url":"https://patchwork.libcamera.org/api/people/42/?format=json","name":"David Plowman","email":"david.plowman@raspberrypi.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/18195/mbox/","series":[{"id":3725,"url":"https://patchwork.libcamera.org/api/series/3725/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=3725","date":"2023-01-25T13:20:18","name":"[libcamera-devel] libcamera: controls: Add controls for AEC/AGC flicker avoidance","version":1,"mbox":"https://patchwork.libcamera.org/series/3725/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/18195/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/18195/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 564A9BEFBE\n\tfor ;\n\tWed, 25 Jan 2023 13:20:23 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id BF1DA603C0;\n\tWed, 25 Jan 2023 14:20:22 +0100 (CET)","from mail-wm1-x332.google.com (mail-wm1-x332.google.com\n\t[IPv6:2a00:1450:4864:20::332])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 87943603C0\n\tfor ;\n\tWed, 25 Jan 2023 14:20:20 +0100 (CET)","by mail-wm1-x332.google.com with SMTP id l8so13735721wms.3\n\tfor ;\n\tWed, 25 Jan 2023 05:20:20 -0800 (PST)","from pi4-davidp.pitowers.org\n\t([2a00:1098:3142:14:e4a2:3070:eea4:e434])\n\tby smtp.gmail.com with ESMTPSA id\n\tu11-20020a05600c19cb00b003d9fb04f658sm2001790wmq.4.2023.01.25.05.20.19\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tWed, 25 Jan 2023 05:20:19 -0800 (PST)"],"DKIM-Signature":["v=1; 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\n\tWed, 25 Jan 2023 05:20:19 -0800 (PST)","To":"libcamera-devel@lists.libcamera.org","Date":"Wed, 25 Jan 2023 13:20:18 +0000","Message-Id":"<20230125132018.5725-1-david.plowman@raspberrypi.com>","X-Mailer":"git-send-email 2.30.2","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH] libcamera: controls: Add controls for\n\tAEC/AGC flicker avoidance","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","From":"David Plowman via libcamera-devel ","Reply-To":"David Plowman ","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"Flicker is the term used to describe brightness banding or oscillation\nof images caused typically by artificial lighting driven by a 50 or\n60Hz mains supply. We add two controls intended to be used by AEC/AGC\nalgorithms:\n\nAeFlickerMode to determine whether flicker avoidance is active or not.\n\nAeFlickerPeriod to specify a custom flicker period when the period is\nother than 50 or 60Hz.\n\nSigned-off-by: David Plowman \n---\n src/libcamera/control_ids.yaml | 52 ++++++++++++++++++++++++++++++++++\n 1 file changed, 52 insertions(+)","diff":"diff --git a/src/libcamera/control_ids.yaml b/src/libcamera/control_ids.yaml\nindex adea5f90..5e5428ea 100644\n--- a/src/libcamera/control_ids.yaml\n+++ b/src/libcamera/control_ids.yaml\n@@ -14,6 +14,58 @@ controls:\n \n \\sa ExposureTime AnalogueGain\n \n+ - AeFlickerMode:\n+ type: int32_t\n+ description: |\n+ Set the flicker mode, which determines whether, and how, the AGC/AEC\n+ algorithm attempts to hide flicker effects caused by the duty cycle of\n+ artificial lighting.\n+\n+ Although implementation dependent, many algorithms for \"flicker\n+ avoidance\" work by restricting the exposure time to integer multiples\n+ of this cycle period, wherever possible.\n+\n+ Implementations may not support all of the flicker modes listed below.\n+\n+ enum:\n+ - name: FlickerOff\n+ value: 0\n+ description: No flicker avoidance is performed.\n+ - name: Flicker50Hz\n+ value: 1\n+ description: 50Hz flicker avoidance.\n+ Suppress flicker effects caused by lighting runing with a\n+ 100Hz period (such as produced by 50Hz mains electricity).\n+ - name: Flicker60Hz\n+ value: 2\n+ description: 60Hz flicker avoidance.\n+ Suppress flicker effects caused by lighting running with a\n+ 120Hz period (such as produced by 60Hz mains electricity).\n+ - name: FlickerCustom\n+ value: 3\n+ description: Custom flicker avoidance.\n+ Suppress flicker effects caused by lighting running with a\n+ period specified by AeFlickerPeriod.\n+\n+ \\sa AeFlickerPeriod\n+ - name: FlickerAuto\n+ value: 4\n+ description: Automatic flicker period detection and avoidance.\n+ The system will automatically determine the most likely value\n+ of the flicker period, and avoid flicker of this frequency.\n+ \n+ - AeFlickerPeriod:\n+ type: int32_t\n+ description: Custom flicker period in microseconds.\n+ This value is taken as the current flicker period to avoid. It\n+ is used when the AeFlickerMode is set to FlickerCustom.\n+\n+ For example, to avoid 50Hz mains flicker, you could set the period\n+ to 10000, corresponding to 10ms (twice the mains frequency), and\n+ AeFlickerMode to FlickerCustom.\n+\n+ \\sa AeFlickerMode\n+\n - AeLocked:\n type: bool\n description: |\n","prefixes":["libcamera-devel"]}