{"id":23958,"url":"https://patchwork.libcamera.org/api/patches/23958/?format=json","web_url":"https://patchwork.libcamera.org/patch/23958/","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":"<20250725-multicontext-v1-4-ea558291e101@ideasonboard.com>","date":"2025-07-25T10:33:49","name":"[4/9] libcamera: v4l2_videodevice: Add bind context","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"132502490af8f38a98653472a666f202774968dc","submitter":{"id":143,"url":"https://patchwork.libcamera.org/api/people/143/?format=json","name":"Jacopo Mondi","email":"jacopo.mondi@ideasonboard.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/23958/mbox/","series":[{"id":5329,"url":"https://patchwork.libcamera.org/api/series/5329/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5329","date":"2025-07-25T10:33:45","name":"libcamera: Support for multi-context operations","version":1,"mbox":"https://patchwork.libcamera.org/series/5329/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/23958/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/23958/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 E204BC3237\n\tfor ;\n\tFri, 25 Jul 2025 10:34:11 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 2D2CB690CF;\n\tFri, 25 Jul 2025 12:34:06 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 10BC9690B3\n\tfor ;\n\tFri, 25 Jul 2025 12:33:58 +0200 (CEST)","from [192.168.0.172] (mob-5-90-139-29.net.vodafone.it\n\t[5.90.139.29])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 1743478E;\n\tFri, 25 Jul 2025 12:33:19 +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=\"igWb+iy4\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1753439599;\n\tbh=KzSgFu4jAF2dlBOo2vbhWbq+HKvYpf+PUmT/IPXaAZM=;\n\th=From:Date:Subject:References:In-Reply-To:To:Cc:From;\n\tb=igWb+iy4UQQ53ee5XXfKZcCS3LK8lLu4eulwlMHobfXaoax1nPk4z+/oK44xFf1fi\n\tKlXs8Mvpad5c3XKdt68Q174WwVCotuh/2Df8WgxtZYtEmCBTy9F0l4nVFJXXMA8qwf\n\tmg6LrRP8ufCLx0zSqQAjJzg1VRC7W+ULsrgs0Fn8=","From":"Jacopo Mondi ","Date":"Fri, 25 Jul 2025 12:33:49 +0200","Subject":"[PATCH 4/9] libcamera: v4l2_videodevice: Add bind context","MIME-Version":"1.0","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","Message-Id":"<20250725-multicontext-v1-4-ea558291e101@ideasonboard.com>","References":"<20250725-multicontext-v1-0-ea558291e101@ideasonboard.com>","In-Reply-To":"<20250725-multicontext-v1-0-ea558291e101@ideasonboard.com>","To":"libcamera-devel@lists.libcamera.org","Cc":"Jacopo Mondi ","X-Mailer":"b4 0.14.2","X-Developer-Signature":"v=1; a=openpgp-sha256; l=2013;\n\ti=jacopo.mondi@ideasonboard.com; h=from:subject:message-id;\n\tbh=KzSgFu4jAF2dlBOo2vbhWbq+HKvYpf+PUmT/IPXaAZM=;\n\tb=owEBbQKS/ZANAwAKAXI0Bo8WoVY8AcsmYgBog12T735g8B3cRtq4rxFOGDBktRToj/5gc6Pps\n\tLqpQpPr8giJAjMEAAEKAB0WIQS1xD1IgJogio9YOMByNAaPFqFWPAUCaINdkwAKCRByNAaPFqFW\n\tPFBID/0SfxLw1lNvxu7vf3ikmBwBtaVaIleaKigSJ+bEGdWxEFzeEGqx8SqpT4QH6gYcczP+kur\n\taf6yZxI/R/7s9nl7oAXFPkUNOyPMSQWryJuUgBDOSBrY8nCNT64jGWf3GaZqAD1N3gxY/zK8p65\n\tuG3D9AemhBzfU0be/LMmnOwG/6fuf8y5FvO5LCH6c0UCW1pqxC5INsFHUTl5laVxYCVa1GK4//2\n\td/UTHjM/k2jdkFCIz0soPGRDJtEZrtaRrJkkORb2+VX/4SVYBQr9bfwMUqLZ1o1Jw9+5uuHdDqK\n\t91rz46HE04pl2WuJoQ+BeAmZkzyll9qsKhlOMqXzbgTRNAS+rye5lBBQioor5URhAiWG+gZPuz8\n\t5ERAjRVZ76XNAxspxTTGEq96ps9edsvQA3wjcg2Pe+pS/XhfvS5cFyE44QGOKRtS/gfpmMWMws9\n\tjNfuLjGn+xiVQTfIRb7d5HgTySQy5CESKbI9xZ2/etRWmeKTjO+A0T+j1UD8i/imvFj8Bz7DBiL\n\tGA365rh+Fv2a0t/6kyWgDVNZN2uRxPWRGWNyquwECJ7WngZ0PdpguT+HZXp7gofdnmc6GV3rker\n\tbXZVisVzT3MjuSIn27dsyov7PeHPjyCrIGZI0qXVezMjcDD53V19B+804jET4RG4M1MNnC3ye0y\n\tIc85KIbppzumWxA==","X-Developer-Key":"i=jacopo.mondi@ideasonboard.com; a=openpgp;\n\tfpr=72392EDC88144A65C701EA9BA5826A2587AD026B","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":"Add a function to the V4L2VideoDevice class that allows to\nbind a video device to a media device context using the\nVIDIOC_BIND_CONTEXT ioctl.\n\nSigned-off-by: Jacopo Mondi \n---\n include/libcamera/internal/v4l2_videodevice.h | 2 ++\n src/libcamera/v4l2_videodevice.cpp | 18 ++++++++++++++++++\n 2 files changed, 20 insertions(+)","diff":"diff --git a/include/libcamera/internal/v4l2_videodevice.h b/include/libcamera/internal/v4l2_videodevice.h\nindex ae6a76cb02090ddadf5ad1331a47fd68585cf586..765574b3e0b52b625e927a50045a61f8c2a0ac6e 100644\n--- a/include/libcamera/internal/v4l2_videodevice.h\n+++ b/include/libcamera/internal/v4l2_videodevice.h\n@@ -202,6 +202,8 @@ public:\n \n \tconst V4L2Capability &caps() const { return caps_; }\n \n+\tint bindContext(unsigned int context);\n+\n \tint getFormat(V4L2DeviceFormat *format);\n \tint tryFormat(V4L2DeviceFormat *format);\n \tint setFormat(V4L2DeviceFormat *format);\ndiff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp\nindex 76bdad40ca8d7a024e4644888737371eff1f09fd..a854f3b10201eaa4f643d0e15fc04b3c49fbeffe 100644\n--- a/src/libcamera/v4l2_videodevice.cpp\n+++ b/src/libcamera/v4l2_videodevice.cpp\n@@ -795,6 +795,24 @@ std::string V4L2VideoDevice::logPrefix() const\n \t\t(V4L2_TYPE_IS_OUTPUT(bufferType_) ? \":out]\" : \":cap]\");\n }\n \n+/**\n+ * \\brief Bind a video device to a media device context\n+ * \\param[in] context The file descriptor that identifies the media device\n+ * context\n+ * \\return 0 on success or a negative error code otherwise\n+ */\n+int V4L2VideoDevice::bindContext(unsigned int context)\n+{\n+\tstruct v4l2_context c = {};\n+\tc.context_fd = context;\n+\n+\tint ret = ioctl(VIDIOC_BIND_CONTEXT, &c);\n+\tif (ret)\n+\t\tLOG(V4L2, Error) << \"Unable to bind context: \" << strerror(-ret);\n+\n+\treturn ret;\n+}\n+\n /**\n * \\brief Retrieve the image format set on the V4L2 video device\n * \\param[out] format The image format applied on the video device\n","prefixes":["4/9"]}