{"id":27512,"url":"https://patchwork.libcamera.org/api/patches/27512/?format=json","web_url":"https://patchwork.libcamera.org/patch/27512/","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":"<20260728054311.482231-1-elliot.chen@oss.nxp.com>","date":"2026-07-28T05:43:11","name":"gstreamer: Reconfigure when peer caps gain extra fields","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"2d15020ea094280d45ba3718abebd694ccb381ef","submitter":{"id":443,"url":"https://patchwork.libcamera.org/api/people/443/?format=json","name":"Elliot Chen (OSS)","email":"elliot.chen@oss.nxp.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/27512/mbox/","series":[{"id":6087,"url":"https://patchwork.libcamera.org/api/series/6087/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=6087","date":"2026-07-28T05:43:11","name":"gstreamer: Reconfigure when peer caps gain extra fields","version":1,"mbox":"https://patchwork.libcamera.org/series/6087/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/27512/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/27512/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 14524C328C\n\tfor ;\n\tTue, 28 Jul 2026 05:43:26 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 2399467F90;\n\tTue, 28 Jul 2026 07:43:25 +0200 (CEST)","from DUZPR83CU001.outbound.protection.outlook.com\n\t(mail-northeuropeazlp170120005.outbound.protection.outlook.com\n\t[IPv6:2a01:111:f403:c200::5])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 2F51A67EE4\n\tfor ;\n\tTue, 28 Jul 2026 07:43:23 +0200 (CEST)","from AM9PR04MB8244.eurprd04.prod.outlook.com\n\t(2603:10a6:20b:3e0::24)\n\tby AM8PR04MB7746.eurprd04.prod.outlook.com (2603:10a6:20b:235::20)\n\twith Microsoft SMTP Server (version=TLS1_2,\n\tcipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.270.12;\n\tTue, 28 Jul 2026 05:43:21 +0000","from AM9PR04MB8244.eurprd04.prod.outlook.com\n\t([fe80::a59f:4bc2:f026:4012]) by\n\tAM9PR04MB8244.eurprd04.prod.outlook.com\n\t([fe80::a59f:4bc2:f026:4012%4]) with mapi id 15.21.0270.009;\n\tTue, 28 Jul 2026 05:43:21 +0000"],"Authentication-Results":["lancelot.ideasonboard.com; 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The existing check only\nhandles empty peer caps. Add a structure comparison to detect such\nchanges and trigger reconfiguration with caps renegotiation.\n\nSigned-off-by: Elliot Chen \n---\n src/gstreamer/gstlibcamerasrc.cpp | 12 ++++++++++++\n 1 file changed, 12 insertions(+)","diff":"diff --git a/src/gstreamer/gstlibcamerasrc.cpp b/src/gstreamer/gstlibcamerasrc.cpp\nindex 9061f9163..88717b048 100644\n--- a/src/gstreamer/gstlibcamerasrc.cpp\n+++ b/src/gstreamer/gstlibcamerasrc.cpp\n@@ -744,6 +744,18 @@ gst_libcamera_src_task_run(gpointer user_data)\n \t\t\t\treconfigure = true;\n \t\t\t\tbreak;\n \t\t\t}\n+\n+\t\t\t/*\n+\t\t\t * Caps may gain extra fields after the initial negotiation (e.g.\n+\t\t\t * colorimetry added by a downstream element). Detect such changes\n+\t\t\t * and trigger reconfiguration.\n+\t\t\t */\n+\t\t\tconst GstStructure *s = caps ? gst_caps_get_structure(caps, 0) : nullptr;\n+\t\t\tconst GstStructure *peer_s = peercaps ? gst_caps_get_structure(peercaps, 0) : nullptr;\n+\t\t\tif (!s || !peer_s || !gst_structure_is_equal(s, peer_s)) {\n+\t\t\t\treconfigure = true;\n+\t\t\t\tbreak;\n+\t\t\t}\n \t\t}\n \t}\n \n","prefixes":[]}