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{ "id": 22097, "url": "https://patchwork.libcamera.org/api/1.1/patches/22097/?format=api", "web_url": "https://patchwork.libcamera.org/patch/22097/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/1.1/projects/1/?format=api", "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controls: Add FrameWallClock and FrameWallClockRaw controls", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "8b524e92939c0801e2c44f608296dc7b946138e4", "submitter": { "id": 42, "url":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/1.1/people/42/?format=api", "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/1.1/series/4822/?format=api", "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": "<libcamera-devel-bounces@lists.libcamera.org>", "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 <parsemail@patchwork.libcamera.org>;\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 <libcamera-devel@lists.libcamera.org>;\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 <libcamera-devel@lists.libcamera.org>;\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 <david.plowman@raspberrypi.com>", "To": "libcamera-devel@lists.libcamera.org", "Cc": "David Plowman <david.plowman@raspberrypi.com>", "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": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "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 <david.plowman@raspberrypi.com>\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" ] }