{"id":18483,"url":"https://patchwork.libcamera.org/api/1.1/patches/18483/?format=json","web_url":"https://patchwork.libcamera.org/patch/18483/","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":"<20230328085521.7409-2-david.plowman@raspberrypi.com>","date":"2023-03-28T08:55:20","name":"[libcamera-devel,v3,1/2] libcamera: controls: Add controls for AEC/AGC flicker avoidance","commit_ref":null,"pull_url":null,"state":"accepted","archived":false,"hash":"b446d24f723348b46113baa9442c4bb2ba6bbdcb","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/18483/mbox/","series":[{"id":3822,"url":"https://patchwork.libcamera.org/api/1.1/series/3822/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=3822","date":"2023-03-28T08:55:19","name":"Add flicker avoidance controls","version":3,"mbox":"https://patchwork.libcamera.org/series/3822/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/18483/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/18483/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 76B45BD160\n\tfor ;\n\tTue, 28 Mar 2023 08:55:31 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 226BE6274E;\n\tTue, 28 Mar 2023 10:55:31 +0200 (CEST)","from mail-io1-xd33.google.com (mail-io1-xd33.google.com\n\t[IPv6:2607:f8b0:4864:20::d33])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 19457626E2\n\tfor ;\n\tTue, 28 Mar 2023 10:55:27 +0200 (CEST)","by mail-io1-xd33.google.com with SMTP id o12so5070643iow.6\n\tfor ;\n\tTue, 28 Mar 2023 01:55:27 -0700 (PDT)","from pi4-davidp.pitowers.org\n\t([2a00:1098:3142:14:2bce:64d6:1a5c:49a2])\n\tby smtp.gmail.com with ESMTPSA id\n\tg1-20020a028501000000b0040380d7c768sm9887414jai.106.2023.03.28.01.55.24\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tTue, 28 Mar 2023 01:55:25 -0700 (PDT)"],"DKIM-Signature":["v=1; 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\n\tTue, 28 Mar 2023 01:55:25 -0700 (PDT)","To":"libcamera-devel@lists.libcamera.org","Date":"Tue, 28 Mar 2023 09:55:20 +0100","Message-Id":"<20230328085521.7409-2-david.plowman@raspberrypi.com>","X-Mailer":"git-send-email 2.30.2","In-Reply-To":"<20230328085521.7409-1-david.plowman@raspberrypi.com>","References":"<20230328085521.7409-1-david.plowman@raspberrypi.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH v3 1/2] libcamera: controls: Add controls\n\tfor AEC/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 three controls intended to be used by\nAEC/AGC algorithms:\n\nAeFlickerMode to enable flicker avoidance.\n\nAeFlickerCustom to set custom flicker periods.\n\nAeFlickerDetected to report any flicker that is currently detected.\n\nSigned-off-by: David Plowman \n---\n src/libcamera/control_ids.yaml | 84 +++++++++++++++++++++++++++-------\n 1 file changed, 67 insertions(+), 17 deletions(-)","diff":"diff --git a/src/libcamera/control_ids.yaml b/src/libcamera/control_ids.yaml\nindex adea5f90..b472050c 100644\n--- a/src/libcamera/control_ids.yaml\n+++ b/src/libcamera/control_ids.yaml\n@@ -156,6 +156,73 @@ controls:\n control of which features should be automatically adjusted shouldn't\n better be handled through a separate AE mode control.\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 this exposure time to integer multiples\n+ of the 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: FlickerFreq50Hz\n+ value: 1\n+ description: 50Hz flicker avoidance.\n+ Suppress flicker effects caused by lighting running with a 100Hz\n+ period (such as that produced by 50Hz mains electricity).\n+ - name: FlickerFreq60Hz\n+ value: 2\n+ description: 60Hz flicker avoidance.\n+ Suppress flicker effects caused by lighting running with a 120Hz\n+ period (such as that 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 period\n+ specified by the AeFlickerCustom control.\n+ \\sa AeFlickerCustom\n+ - name: FlickerAuto\n+ value: 4\n+ description: Automatic flicker period detection and avoidance.\n+ The system will automatically determine the most likely value of\n+ flicker period, and avoid flicker of this frequency.\n+\n+ - AeFlickerCustom:\n+ type: int32_t\n+ description: Custom flicker period in microseconds.\n+ This value sets the current flicker period to avoid. It is used when\n+ AeFlickerMode is set to FlickerCustom.\n+\n+ If this control is not available, then the setting of custom flicker\n+ periods is not supported.\n+\n+ \\sa AeFlickerMode\n+\n+ - AeFlickerDetected:\n+ type: int32_t\n+ description: Flicker period detected in microseconds.\n+ The value reported here indicates the currently detected flicker\n+ period, or zero if no flicker at all is detected.\n+\n+ So in the case of 50Hz mains flicker, the value would be 10000\n+ (corresponding to 100Hz), or 8333 (120Hz) for 60Hz mains flicker. But\n+ note that it is not required that any form of scene flicker is detected\n+ at all, so depending on the implementation, this metadata may just\n+ report zero or be entirely absent.\n+\n+ AeFlickerDetected may also report other values for non-standard flicker\n+ periods.\n+\n+ \\sa AeFlickerMode\n+\n - Brightness:\n type: float\n description: |\n@@ -843,23 +910,6 @@ controls:\n value: 1\n description: The lens shading map mode is available.\n \n- - SceneFlicker:\n- type: int32_t\n- draft: true\n- description: |\n- Control to report the detected scene light frequency. Currently\n- identical to ANDROID_STATISTICS_SCENE_FLICKER.\n- enum:\n- - name: SceneFickerOff\n- value: 0\n- description: No flickering detected.\n- - name: SceneFicker50Hz\n- value: 1\n- description: 50Hz flickering detected.\n- - name: SceneFicker60Hz\n- value: 2\n- description: 60Hz flickering detected.\n-\n - PipelineDepth:\n type: int32_t\n draft: true\n","prefixes":["libcamera-devel","v3","1/2"]}