{"id":17743,"url":"https://patchwork.libcamera.org/api/1.1/patches/17743/?format=json","web_url":"https://patchwork.libcamera.org/patch/17743/","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":"<20221102103542.3932541-1-kieran.bingham@ideasonboard.com>","date":"2022-11-02T10:35:42","name":"[libcamera-devel] libcamera: v4l2_device: Workaround faulty control menus","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"bb6fe80df580509d6c98c833da90e2d4a6df3b0f","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/1.1/people/4/?format=json","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/17743/mbox/","series":[{"id":3591,"url":"https://patchwork.libcamera.org/api/1.1/series/3591/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=3591","date":"2022-11-02T10:35:42","name":"[libcamera-devel] libcamera: v4l2_device: Workaround faulty control menus","version":1,"mbox":"https://patchwork.libcamera.org/series/3591/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/17743/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/17743/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 1FABABD16B\n\tfor ;\n\tWed, 2 Nov 2022 10:35:49 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 4EA9863075;\n\tWed, 2 Nov 2022 11:35:48 +0100 (CET)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 774C163009\n\tfor ;\n\tWed, 2 Nov 2022 11:35:46 +0100 (CET)","from Monstersaurus.tail69b4.ts.net\n\t(cpc89244-aztw30-2-0-cust3082.18-1.cable.virginm.net [86.31.172.11])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id DF73A1226;\n\tWed, 2 Nov 2022 11:35:45 +0100 (CET)"],"DKIM-Signature":["v=1; 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dkim=pass (1024-bit key; \n\tunprotected) header.d=ideasonboard.com\n\theader.i=@ideasonboard.com\n\theader.b=\"jlymVlvp\"; dkim-atps=neutral","To":"libcamera devel ","Date":"Wed, 2 Nov 2022 10:35:42 +0000","Message-Id":"<20221102103542.3932541-1-kieran.bingham@ideasonboard.com>","X-Mailer":"git-send-email 2.34.1","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH] libcamera: v4l2_device: Workaround faulty\n\tcontrol menus","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","From":"Kieran Bingham via libcamera-devel\n\t","Reply-To":"Kieran Bingham ","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"Some UVC cameras have been identified that can provide V4L2 menu\ncontrols without any menu items.\n\nThis leads to a segfault where we try to construct a\nControlInfo(Span<>,default) with an empty span.\n\nReturning ControlInfo(); instead results in a Fatal log error due to the\ncontrol validation failing.\n\nProvide the default value as the only acceptable menu control item, and\nreport the issue on the debug log.\n\nBug: https://bugs.libcamera.org/show_bug.cgi?id=167\nSigned-off-by: Kieran Bingham \n---\n src/libcamera/v4l2_device.cpp | 10 ++++++++++\n 1 file changed, 10 insertions(+)","diff":"diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp\nindex c17b323f8af0..f35820271f51 100644\n--- a/src/libcamera/v4l2_device.cpp\n+++ b/src/libcamera/v4l2_device.cpp\n@@ -583,6 +583,16 @@ ControlInfo V4L2Device::v4l2MenuControlInfo(const struct v4l2_query_ext_ctrl &ct\n \t\tindices.push_back(index);\n \t}\n \n+\t/*\n+\t * Some faulty UVC drivers are known to return an empty menu control.\n+\t * In that event, populate the indicies with the default value only.\n+\t */\n+\tif (indices.size() == 0) {\n+\t\tLOG(V4L2, Debug)\n+\t\t\t<< \"Menu control '\" << ctrl.name << \"' has no entries\";\n+\t\tindices.push_back(static_cast(ctrl.default_value));\n+\t}\n+\n \treturn ControlInfo(indices,\n \t\t\t ControlValue(static_cast(ctrl.default_value)));\n }\n","prefixes":["libcamera-devel"]}