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{ "id": 18785, "url": "https://patchwork.libcamera.org/api/patches/18785/?format=api", "web_url": "https://patchwork.libcamera.org/patch/18785/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/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": "<20230704225746.3838484-2-kieran.bingham@ideasonboard.com>", "date": "2023-07-04T22:57:45", "name": "[libcamera-devel,v2,1/2] v4l2: Use SystemDevices properties to identify cameras", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": false, "hash": "24e347d7aff282ecf15e6af90f0aba68b6ce2c30", "submitter": { "id": 4, "url": "https://patchwork.libcamera.org/api/people/4/?format=api", "name": "Kieran Bingham", "email": "kieran.bingham@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/18785/mbox/", "series": [ { "id": 3952, "url": "https://patchwork.libcamera.org/api/series/3952/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=3952", "date": "2023-07-04T22:57:44", "name": "libcamera: Remove CameraManager::get(dev_t)", "version": 2, "mbox": "https://patchwork.libcamera.org/series/3952/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/18785/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/18785/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 BFEABC3240\n\tfor <parsemail@patchwork.libcamera.org>;\n\tTue, 4 Jul 2023 22:58:49 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 6E899628BD;\n\tWed, 5 Jul 2023 00:58:49 +0200 (CEST)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id E6B99628BB\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tWed, 5 Jul 2023 00:58:46 +0200 (CEST)", "from Monstersaurus.local\n\t(aztw-30-b2-v4wan-166917-cust845.vm26.cable.virginm.net\n\t[82.37.23.78])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 37A0C1B6D;\n\tWed, 5 Jul 2023 00:58:02 +0200 (CEST)" ], "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=\"MStTEzH/\"; dkim-atps=neutral", "To": "libcamera devel <libcamera-devel@lists.libcamera.org>", "Date": "Tue, 4 Jul 2023 23:57:45 +0100", "Message-Id": "<20230704225746.3838484-2-kieran.bingham@ideasonboard.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<20230704225746.3838484-1-kieran.bingham@ideasonboard.com>", "References": "<20230704225746.3838484-1-kieran.bingham@ideasonboard.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH v2 1/2] v4l2: Use SystemDevices properties\n\tto identify cameras", "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>", "From": "Kieran Bingham via libcamera-devel\n\t<libcamera-devel@lists.libcamera.org>", "Reply-To": "Kieran Bingham <kieran.bingham@ideasonboard.com>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "The CameraManager->get(dev_t) helper was implemented only to support the\nV4L2 Adaptation layer, and has been deprecated now that a new camera\nproperty - SystemDevices has been introduced.\n\nRework the implementation of getCameraIndex() to use the SystemDevices\nproperty and remove reliance on the now deprecated call.\n\nSigned-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>\n---\n src/v4l2/v4l2_compat_manager.cpp | 29 ++++++++++++++++++++++++-----\n 1 file changed, 24 insertions(+), 5 deletions(-)", "diff": "diff --git a/src/v4l2/v4l2_compat_manager.cpp b/src/v4l2/v4l2_compat_manager.cpp\nindex 0f7575c54b22..948dadad646d 100644\n--- a/src/v4l2/v4l2_compat_manager.cpp\n+++ b/src/v4l2/v4l2_compat_manager.cpp\n@@ -24,6 +24,7 @@\n \n #include <libcamera/camera.h>\n #include <libcamera/camera_manager.h>\n+#include <libcamera/property_ids.h>\n \n #include \"v4l2_camera_file.h\"\n \n@@ -113,14 +114,32 @@ int V4L2CompatManager::getCameraIndex(int fd)\n \tif (ret < 0)\n \t\treturn -1;\n \n-\tstd::shared_ptr<Camera> target = cm_->get(statbuf.st_rdev);\n-\tif (!target)\n-\t\treturn -1;\n+\tconst dev_t devnum = statbuf.st_rdev;\n \n+\t/*\n+\t * Iterate each known camera and identify if it reports this nodes\n+\t * device number in its list of SystemDevices.\n+\t */\n \tauto cameras = cm_->cameras();\n \tfor (auto [index, camera] : utils::enumerate(cameras)) {\n-\t\tif (camera == target)\n-\t\t\treturn index;\n+\t\tSpan<const int64_t> devices = camera->properties()\n+\t\t\t\t\t\t .get(properties::SystemDevices)\n+\t\t\t\t\t\t .value_or(Span<int64_t>{});\n+\n+\t\t/*\n+\t\t * While there may be multiple Cameras that could reference the\n+\t\t * same device node, we take a first match as a best effort for\n+\t\t * now.\n+\t\t *\n+\t\t * \\todo Consider reworking the V4L2 adaptation layer to stop\n+\t\t * trying to map video nodes directly to a camera and instead\n+\t\t * hide all devices that may be used by libcamera and expose a\n+\t\t * consistent 1:1 mapping with each Camera instance.\n+\t\t */\n+\t\tfor (const int64_t dev : devices) {\n+\t\t\tif (dev == static_cast<int64_t>(devnum))\n+\t\t\t\treturn index;\n+\t\t}\n \t}\n \n \treturn -1;\n", "prefixes": [ "libcamera-devel", "v2", "1/2" ] }