From patchwork Fri Jul 25 10:33:49 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 23958 Return-Path: X-Original-To: parsemail@patchwork.libcamera.org Delivered-To: parsemail@patchwork.libcamera.org Received: from lancelot.ideasonboard.com (lancelot.ideasonboard.com [92.243.16.209]) by patchwork.libcamera.org (Postfix) with ESMTPS id E204BC3237 for ; Fri, 25 Jul 2025 10:34:11 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 2D2CB690CF; Fri, 25 Jul 2025 12:34:06 +0200 (CEST) Authentication-Results: lancelot.ideasonboard.com; dkim=pass (1024-bit key; unprotected) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="igWb+iy4"; dkim-atps=neutral Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 10BC9690B3 for ; Fri, 25 Jul 2025 12:33:58 +0200 (CEST) Received: from [192.168.0.172] (mob-5-90-139-29.net.vodafone.it [5.90.139.29]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 1743478E; Fri, 25 Jul 2025 12:33:19 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1753439599; bh=KzSgFu4jAF2dlBOo2vbhWbq+HKvYpf+PUmT/IPXaAZM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=igWb+iy4UQQ53ee5XXfKZcCS3LK8lLu4eulwlMHobfXaoax1nPk4z+/oK44xFf1fi KlXs8Mvpad5c3XKdt68Q174WwVCotuh/2Df8WgxtZYtEmCBTy9F0l4nVFJXXMA8qwf mg6LrRP8ufCLx0zSqQAjJzg1VRC7W+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 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; i=jacopo.mondi@ideasonboard.com; h=from:subject:message-id; bh=KzSgFu4jAF2dlBOo2vbhWbq+HKvYpf+PUmT/IPXaAZM=; b=owEBbQKS/ZANAwAKAXI0Bo8WoVY8AcsmYgBog12T735g8B3cRtq4rxFOGDBktRToj/5gc6Pps LqpQpPr8giJAjMEAAEKAB0WIQS1xD1IgJogio9YOMByNAaPFqFWPAUCaINdkwAKCRByNAaPFqFW PFBID/0SfxLw1lNvxu7vf3ikmBwBtaVaIleaKigSJ+bEGdWxEFzeEGqx8SqpT4QH6gYcczP+kur af6yZxI/R/7s9nl7oAXFPkUNOyPMSQWryJuUgBDOSBrY8nCNT64jGWf3GaZqAD1N3gxY/zK8p65 uG3D9AemhBzfU0be/LMmnOwG/6fuf8y5FvO5LCH6c0UCW1pqxC5INsFHUTl5laVxYCVa1GK4//2 d/UTHjM/k2jdkFCIz0soPGRDJtEZrtaRrJkkORb2+VX/4SVYBQr9bfwMUqLZ1o1Jw9+5uuHdDqK 91rz46HE04pl2WuJoQ+BeAmZkzyll9qsKhlOMqXzbgTRNAS+rye5lBBQioor5URhAiWG+gZPuz8 5ERAjRVZ76XNAxspxTTGEq96ps9edsvQA3wjcg2Pe+pS/XhfvS5cFyE44QGOKRtS/gfpmMWMws9 jNfuLjGn+xiVQTfIRb7d5HgTySQy5CESKbI9xZ2/etRWmeKTjO+A0T+j1UD8i/imvFj8Bz7DBiL GA365rh+Fv2a0t/6kyWgDVNZN2uRxPWRGWNyquwECJ7WngZ0PdpguT+HZXp7gofdnmc6GV3rker bXZVisVzT3MjuSIn27dsyov7PeHPjyCrIGZI0qXVezMjcDD53V19B+804jET4RG4M1MNnC3ye0y Ic85KIbppzumWxA== X-Developer-Key: i=jacopo.mondi@ideasonboard.com; a=openpgp; fpr=72392EDC88144A65C701EA9BA5826A2587AD026B X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libcamera-devel-bounces@lists.libcamera.org Sender: "libcamera-devel" Add a function to the V4L2VideoDevice class that allows to bind a video device to a media device context using the VIDIOC_BIND_CONTEXT ioctl. Signed-off-by: Jacopo Mondi Reviewed-by: Isaac Scott --- include/libcamera/internal/v4l2_videodevice.h | 2 ++ src/libcamera/v4l2_videodevice.cpp | 18 ++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/libcamera/internal/v4l2_videodevice.h b/include/libcamera/internal/v4l2_videodevice.h index ae6a76cb02090ddadf5ad1331a47fd68585cf586..765574b3e0b52b625e927a50045a61f8c2a0ac6e 100644 --- a/include/libcamera/internal/v4l2_videodevice.h +++ b/include/libcamera/internal/v4l2_videodevice.h @@ -202,6 +202,8 @@ public: const V4L2Capability &caps() const { return caps_; } + int bindContext(unsigned int context); + int getFormat(V4L2DeviceFormat *format); int tryFormat(V4L2DeviceFormat *format); int setFormat(V4L2DeviceFormat *format); diff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp index 76bdad40ca8d7a024e4644888737371eff1f09fd..a854f3b10201eaa4f643d0e15fc04b3c49fbeffe 100644 --- a/src/libcamera/v4l2_videodevice.cpp +++ b/src/libcamera/v4l2_videodevice.cpp @@ -795,6 +795,24 @@ std::string V4L2VideoDevice::logPrefix() const (V4L2_TYPE_IS_OUTPUT(bufferType_) ? ":out]" : ":cap]"); } +/** + * \brief Bind a video device to a media device context + * \param[in] context The file descriptor that identifies the media device + * context + * \return 0 on success or a negative error code otherwise + */ +int V4L2VideoDevice::bindContext(unsigned int context) +{ + struct v4l2_context c = {}; + c.context_fd = context; + + int ret = ioctl(VIDIOC_BIND_CONTEXT, &c); + if (ret) + LOG(V4L2, Error) << "Unable to bind context: " << strerror(-ret); + + return ret; +} + /** * \brief Retrieve the image format set on the V4L2 video device * \param[out] format The image format applied on the video device