{"id":22097,"url":"https://patchwork.libcamera.org/api/patches/22097/?format=json","web_url":"https://patchwork.libcamera.org/patch/22097/","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":"<20241126121706.4350-2-david.plowman@raspberrypi.com>","date":"2024-11-26T12:17:04","name":"[RFC,1/3] controls: Add FrameWallClock and FrameWallClockRaw controls","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"8b524e92939c0801e2c44f608296dc7b946138e4","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/22097/mbox/","series":[{"id":4822,"url":"https://patchwork.libcamera.org/api/series/4822/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=4822","date":"2024-11-26T12:17:03","name":"Frame wallclock timestamps and metadata","version":1,"mbox":"https://patchwork.libcamera.org/series/4822/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/22097/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/22097/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 3B85EC0DA4\n\tfor ;\n\tTue, 26 Nov 2024 12:17:17 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 2B6136606B;\n\tTue, 26 Nov 2024 13:17:14 +0100 (CET)","from mail-wm1-x336.google.com (mail-wm1-x336.google.com\n\t[IPv6:2a00:1450:4864:20::336])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id D36D165FC2\n\tfor ;\n\tTue, 26 Nov 2024 13:17:10 +0100 (CET)","by mail-wm1-x336.google.com with SMTP id\n\t5b1f17b1804b1-4349e4e252dso20285795e9.0\n\tfor ;\n\tTue, 26 Nov 2024 04:17:10 -0800 (PST)","from raspberrypi.pitowers.org\n\t([2a00:1098:3142:1f:c68a:6be1:5ba3:eddd])\n\tby smtp.gmail.com with ESMTPSA id\n\t5b1f17b1804b1-434a15d86a4sm51070325e9.36.2024.11.26.04.17.09\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tTue, 26 Nov 2024 04:17:09 -0800 (PST)"],"Authentication-Results":"lancelot.ideasonboard.com; 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\n\tTue, 26 Nov 2024 04:17:10 -0800 (PST)","From":"David Plowman ","To":"libcamera-devel@lists.libcamera.org","Cc":"David Plowman ","Subject":"[RFC PATCH 1/3] controls: Add FrameWallClock and FrameWallClockRaw\n\tcontrols","Date":"Tue, 26 Nov 2024 12:17:04 +0000","Message-Id":"<20241126121706.4350-2-david.plowman@raspberrypi.com>","X-Mailer":"git-send-email 2.39.5","In-Reply-To":"<20241126121706.4350-1-david.plowman@raspberrypi.com>","References":"<20241126121706.4350-1-david.plowman@raspberrypi.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","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":"We add FrameWallClockRaw, a direct \"raw\" measurement of the wall clock\ntimestamp for the frame, and FrameWallClock, for a smoothed\n(de-jittered) version of the same number.\n\nSigned-off-by: David Plowman \n---\n src/libcamera/control_ids_core.yaml | 29 +++++++++++++++++++++++++++++\n 1 file changed, 29 insertions(+)","diff":"diff --git a/src/libcamera/control_ids_core.yaml b/src/libcamera/control_ids_core.yaml\nindex d34a2d06..7cf0f481 100644\n--- a/src/libcamera/control_ids_core.yaml\n+++ b/src/libcamera/control_ids_core.yaml\n@@ -973,4 +973,33 @@ controls:\n description: |\n Enable or disable the debug metadata.\n \n+ - FrameWallClockRaw:\n+ type: int64_t\n+ description: |\n+ The time in microseconds since the system clock's epoch.\n+\n+ This is a direct measurement of the number of microseconds since the\n+ system clock's epoch. Because of the way it is sampled, this value is\n+ likely to be subject to significant amounts of system and system\n+ load-dependent jitter, typically of many milliseconds in duration.\n+\n+ For a smoothed version of this timestamp, use the FramwWallClock\n+ control.\n+\n+ \\sa FrameWallClock\n+\n+ The FrameWallClockRaw control can only be returned in metadata.\n+\n+ - FrameWallClock:\n+ type: int64_t\n+ description: |\n+ The time in microseconds since the system clock's epoch.\n+\n+ This is a smoothed version of the FrameWallClockRaw timestamp, which\n+ should show much reduced amounts of jitter.\n+\n+ \\sa FrameWallClockRaw\n+\n+ The FrameWallClock control can only be returned in metadata.\n+\n ...\n","prefixes":["RFC","1/3"]}