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{ "id": 24919, "url": "https://patchwork.libcamera.org/api/1.1/patches/24919/?format=api", "web_url": "https://patchwork.libcamera.org/patch/24919/", "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": "<20251030165816.1095180-16-barnabas.pocze@ideasonboard.com>", "date": "2025-10-30T16:58:09", "name": "[RFC,v3,15/22] guides: application: Document Camera::metadataAvailable", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "d26c0e80f9c9b67dc260b8993bae9b9b43fd2fb5", "submitter": { "id": 216, "url": "https://patchwork.libcamera.org/api/1.1/people/216/?format=api", "name": "Barnabás Pőcze", "email": "barnabas.pocze@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/24919/mbox/", "series": [ { "id": 5545, "url": "https://patchwork.libcamera.org/api/1.1/series/5545/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=5545", "date": "2025-10-30T16:57:54", "name": "libcamera: Add `MetadataList`", "version": 3, "mbox": "https://patchwork.libcamera.org/series/5545/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/24919/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/24919/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 12F02C3334\n\tfor <parsemail@patchwork.libcamera.org>;\n\tThu, 30 Oct 2025 16:58:47 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id AD38F609DC;\n\tThu, 30 Oct 2025 17:58:46 +0100 (CET)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 3A0E5608F5\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tThu, 30 Oct 2025 17:58:25 +0100 (CET)", "from pb-laptop.local (185.221.140.239.nat.pool.zt.hu\n\t[185.221.140.239])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 2174D6F3;\n\tThu, 30 Oct 2025 17:56:35 +0100 (CET)" ], "Authentication-Results": "lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"XBSLleRO\"; dkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1761843395;\n\tbh=uyiGdGvWow9KOc5Sy+G/2EdD5abElQRSJ2vENI1m0c0=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=XBSLleROLStdi2cxbNMrZl/KSAekbEb672nWKAc4Dvpf2I4NipIi7Mx1VCb6couXT\n\tSV0XADL2tZj//BA4zpeg9/dRuS32Y++MA0JJA5JvFxm8SVPdFXnPPkdG2m+8p9yKyJ\n\tk9a1+14hiFwk4x5hx0AwdhjXgeSO9snzHsjmOCUo=", "From": "=?utf-8?q?Barnab=C3=A1s_P=C5=91cze?= <barnabas.pocze@ideasonboard.com>", "To": "libcamera-devel@lists.libcamera.org", "Cc": "Jacopo Mondi <jacopo.mondi@ideasonboard.com>", "Subject": "[RFC PATCH v3 15/22] guides: application: Document\n\tCamera::metadataAvailable", "Date": "Thu, 30 Oct 2025 17:58:09 +0100", "Message-ID": "<20251030165816.1095180-16-barnabas.pocze@ideasonboard.com>", "X-Mailer": "git-send-email 2.51.1", "In-Reply-To": "<20251030165816.1095180-1-barnabas.pocze@ideasonboard.com>", "References": "<20251030165816.1095180-1-barnabas.pocze@ideasonboard.com>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "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": "From: Jacopo Mondi <jacopo.mondi@ideasonboard.com>\n\nDocument the Camera::metadataAvailable signal in the application\ndeveloper guide as an opt-in feature to receive early metadata\nnotifications.\n\nSigned-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>\nSigned-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>\n---\nOriginal: https://patchwork.libcamera.org/patch/22228/\n\nchanges in v3:\n * adjust previous paragraph about signals\n---\n Documentation/guides/application-developer.rst | 13 +++++++++++--\n 1 file changed, 11 insertions(+), 2 deletions(-)", "diff": "diff --git a/Documentation/guides/application-developer.rst b/Documentation/guides/application-developer.rst\nindex 06c07d1e94..166919cf62 100644\n--- a/Documentation/guides/application-developer.rst\n+++ b/Documentation/guides/application-developer.rst\n@@ -350,8 +350,17 @@ them.\n \n .. _Qt Signals and Slots: https://doc.qt.io/qt-6/signalsandslots.html\n \n-The ``Camera`` device emits two signals that applications can connect to in\n-order to execute callbacks on frame completion events.\n+During request processing, the ``Camera`` device emits certain signals\n+to notify the application about events regarding each and every request.\n+These signals are described below.\n+\n+The ``Camera::metadataAvailable`` signal notifies applications of the\n+availability of metadata results before a request completes. Receiving\n+notification about metadata availability allows application to fast-track\n+handling of metadata results before all the image buffers in a request are\n+ready. The full list of metadata results associated with a Request is also\n+available at request complete time, and receiving notifications for early\n+metadata availability is an optional feature for applications.\n \n The ``Camera::bufferCompleted`` signal notifies applications that a buffer with\n image data is available. Receiving notifications about the single buffer\n", "prefixes": [ "RFC", "v3", "15/22" ] }