{"id":23882,"url":"https://patchwork.libcamera.org/api/1.1/patches/23882/?format=json","web_url":"https://patchwork.libcamera.org/patch/23882/","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":"<20250721104622.1550908-16-barnabas.pocze@ideasonboard.com>","date":"2025-07-21T10:46:15","name":"[RFC,v2,15/22] guides: application: Document Camera::metadataAvailable","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"3e728f3fe1311c1ce30a92000691c13ba9ec1b35","submitter":{"id":216,"url":"https://patchwork.libcamera.org/api/1.1/people/216/?format=json","name":"Barnabás Pőcze","email":"barnabas.pocze@ideasonboard.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/23882/mbox/","series":[{"id":5305,"url":"https://patchwork.libcamera.org/api/1.1/series/5305/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5305","date":"2025-07-21T10:46:00","name":"libcamera: Add `MetadataList`","version":2,"mbox":"https://patchwork.libcamera.org/series/5305/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/23882/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/23882/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 5B57AC332A\n\tfor ;\n\tMon, 21 Jul 2025 10:46:56 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 59ACE69005;\n\tMon, 21 Jul 2025 12:46:55 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id C6E7B68FED\n\tfor ;\n\tMon, 21 Jul 2025 12:46:34 +0200 (CEST)","from pb-laptop.local (185.221.140.39.nat.pool.zt.hu\n\t[185.221.140.39])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id E086F7967;\n\tMon, 21 Jul 2025 12:45:57 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"waskplvT\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1753094758;\n\tbh=GiWCVTjAPQGmkH7hfxZUtK+QadGAZLVHGyx9WM5aMko=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=waskplvTZw1Eqx7xMr9gL7m+hrDgR6hsH7nCpxKZ/lzSkoKrb/JJWxCZd/gcOtiJV\n\tk1ShbSRjsSA0gFdyFugAD405JxuYyrK/G2iO3LCRuY1Vrnmswrq7iICSchUMX6j+Ry\n\tVZcb1sdciJVIPW0ixkyoJNiaaS2ObRbqdFH1gb+M=","From":"=?utf-8?q?Barnab=C3=A1s_P=C5=91cze?= ","To":"libcamera-devel@lists.libcamera.org","Cc":"Jacopo Mondi ","Subject":"[RFC PATCH v2 15/22] guides: application: Document\n\tCamera::metadataAvailable","Date":"Mon, 21 Jul 2025 12:46:15 +0200","Message-ID":"<20250721104622.1550908-16-barnabas.pocze@ideasonboard.com>","X-Mailer":"git-send-email 2.50.1","In-Reply-To":"<20250721104622.1550908-1-barnabas.pocze@ideasonboard.com>","References":"<20250721104622.1550908-1-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":"","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":"From: Jacopo Mondi \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 \nSigned-off-by: Barnabás Pőcze \n---\nOriginal: https://patchwork.libcamera.org/patch/22228/\n---\n Documentation/guides/application-developer.rst | 8 ++++++++\n 1 file changed, 8 insertions(+)","diff":"diff --git a/Documentation/guides/application-developer.rst b/Documentation/guides/application-developer.rst\nindex 6501345a9..2d7c29010 100644\n--- a/Documentation/guides/application-developer.rst\n+++ b/Documentation/guides/application-developer.rst\n@@ -357,6 +357,14 @@ Signals and Slots`_) to connect events with callbacks to handle them.\n The ``Camera`` device emits two signals that applications can connect to in\n order to execute callbacks on frame completion events.\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 anyway\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 completion event allows applications to implement partial request completion\n","prefixes":["RFC","v2","15/22"]}