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{ "id": 3688, "url": "https://patchwork.libcamera.org/api/1.1/covers/3688/?format=api", "web_url": "https://patchwork.libcamera.org/cover/3688/", "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": "<20200506103346.3433-1-email@uajain.com>", "date": "2020-05-06T10:33:51", "name": "[libcamera-devel,0/4] Introduce UVC hotplug support", "submitter": { "id": 1, "url": "https://patchwork.libcamera.org/api/1.1/people/1/?format=api", "name": "Umang Jain", "email": "email@uajain.com" }, "mbox": "https://patchwork.libcamera.org/cover/3688/mbox/", "series": [ { "id": 881, "url": "https://patchwork.libcamera.org/api/1.1/series/881/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=881", "date": "2020-05-06T10:33:51", "name": "Introduce UVC hotplug support", "version": 1, "mbox": "https://patchwork.libcamera.org/series/881/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/covers/3688/comments/", "headers": { "Return-Path": "<bounces+15657259-5c31-libcamera-devel=lists.libcamera.org@em7280.uajain.com>", "Received": [ "from o1.f.az.sendgrid.net (o1.f.az.sendgrid.net [208.117.55.132])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id E8A38603F2\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tWed, 6 May 2020 12:33:52 +0200 (CEST)", "by filter0073p3las1.sendgrid.net with SMTP id\n\tfilter0073p3las1-3640-5EB2928E-B0\n\t2020-05-06 10:33:50.835394126 +0000 UTC m=+1773089.258245711", "from mail.uajain.com (unknown)\n\tby ismtpd0004p1maa1.sendgrid.net (SG) with ESMTP id\n\tjX19BDfQSB26t9zVdvREKA for <libcamera-devel@lists.libcamera.org>;\n\tWed, 06 May 2020 10:33:50.586 +0000 (UTC)" ], "Authentication-Results": "lancelot.ideasonboard.com; dkim=pass (1024-bit key; \n\tunprotected) header.d=uajain.com\n\theader.i=@uajain.com header.b=\"F6D9c+kZ\"; \n\tdkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=uajain.com;\n\th=from:subject:mime-version:to:cc:content-transfer-encoding:\n\tcontent-type;\n\ts=s1; bh=CF4bVLVnoO++sPZ2jY7mP5xQZCRWO850iOpA6okRImc=;\n\tb=F6D9c+kZSaAScpmRLT7XcKrG62zKglzkMnAxF3hF4C75SOqwTwG4Gs53Wj3Ik3AvLIxp\n\tqbu9+HXDaCp1b3Mq6zoFKidQLfcrtIcyYFiqgAWBrL8fA5D3uldkSyjD8nyJM47Qp/cN/T\n\tL9UqhqkuDVCfDayysSEDe53CrGAeU2fPk=", "From": "Umang Jain <email@uajain.com>", "Date": "Wed, 06 May 2020 10:33:51 +0000 (UTC)", "Message-Id": "<20200506103346.3433-1-email@uajain.com>", "Mime-Version": "1.0", "X-SG-EID": "1Q40EQ7YGir8a9gjSIAdTjhngY657NMk9ckeo4dbHZDiOpywc/L3L9rFqlwE4KPc7nggfkZXnk4gpr6Hf1oWqR869PN94HZjau4vp3/fI1SZf5qGE5Pl56X9iwbcs4MbxONfVE3kXPrFcuHB6mGeS+uXZ4pi2xt8SwTMV4KRJRkh2X4vI2mHa8wd9HFee72n1SqA3132eJH7Koc5t2yVyDnphTP31vGm2qd/J8Ij/CPjSc/mkXbYv4dqSpDMZbin", "To": "libcamera-devel <libcamera-devel@lists.libcamera.org>", "Content-Transfer-Encoding": "7bit", "Content-Type": "text/plain; charset=us-ascii", "Subject": "[libcamera-devel] [PATCH 0/4] Introduce UVC hotplug support", "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>", "X-List-Received-Date": "Wed, 06 May 2020 10:33:53 -0000" }, "content": "Hi all,\n\nThis is the patch series which introduces support for hotplugging\nand hot-unplugging UVC devices (like external webcam) while the\ncamera-manager is running. The implementation comes with a automated\nunit test and qcam integration. To test, simply compile the patch\nseries, fire up qcam, attach a UVC device and start streaming!\n\nHowever, while writing the unit-test in order to test this,\nI might have uncovered a bug in libcamera which I have not been\nable to dig deeper as of now. The unit-test simply bind/unbind a \navailable UVC camera to simulate the hotplug/unplug event.\nHowever, while unbinding a camera, I noticed that camera-manager\nstill keeps around some reference of media-directory(ies) in \n/sys/module/uvcvideo/drivers/usb:uvcvideo/ which makes\nthe symlinks keep linger around *until* the CameraManager\nis stopped. Hence, the test currently has a \"restart the\nCameraManager\" workaround to cleanup symlinks in that sysfs\ndirectory, before cleanly rebinding.\n\nUmang Jain (4):\n libcamera: device_enumerator: Emit a signal when a new device is\n hotplugged\n libcamera: camera_manager: Introduce signals when a camera is\n added/removed\n qcam: main_window: Introduce hotplug support\n tests: Introduce hotplug hot-unplug unit test\n\n include/libcamera/camera_manager.h | 4 +\n src/libcamera/camera_manager.cpp | 47 ++++++-\n src/libcamera/device_enumerator.cpp | 10 ++\n src/libcamera/include/device_enumerator.h | 3 +\n src/qcam/main_window.cpp | 31 +++++\n src/qcam/main_window.h | 3 +\n test/hotplug-cameras.cpp | 152 ++++++++++++++++++++++\n test/meson.build | 1 +\n 8 files changed, 249 insertions(+), 2 deletions(-)\n create mode 100644 test/hotplug-cameras.cpp" }