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[2620:137:e000::1:20]) by mx.google.com with ESMTP id n20-20020a170906701400b009874842217bsi811939ejj.441.2023.08.04.14.58.50; Fri, 04 Aug 2023 14:59:18 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=irl.hu Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229821AbjHDVdt convert rfc822-to-8bit (ORCPT + 99 others); Fri, 4 Aug 2023 17:33:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49834 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229534AbjHDVds (ORCPT ); Fri, 4 Aug 2023 17:33:48 -0400 Received: from irl.hu (irl.hu [95.85.9.111]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2CAFCC5; Fri, 4 Aug 2023 14:33:46 -0700 (PDT) Received: from [192.168.2.4] (51b69adf.dsl.pool.telekom.hu [::ffff:81.182.154.223]) (AUTH: CRAM-MD5 soyer@irl.hu, ) by irl.hu with ESMTPSA id 0000000000072F66.0000000064CD6EB7.0001EB4C; Fri, 04 Aug 2023 23:33:43 +0200 Message-ID: <39e3ed9f0c3fee61bd99788cdc7cf6cdcd1ee65c.camel@irl.hu> Subject: Re: [RFC PATCH 0/2] media: v4l2: map UVC_CT_ROLL_ABSOLUTE_CONTROL From: =?UTF-8?Q?Gerg=C5=91_K=C3=B6teles?= To: Michael Riesch , Mauro Carvalho Chehab , Laurent Pinchart Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Date: Fri, 04 Aug 2023 23:33:42 +0200 In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT User-Agent: Evolution 3.48.4 (3.48.4-1.fc38) MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Michael, On Fri, 2023-08-04 at 20:45 +0200, Michael Riesch wrote: > Hi Gergő, > > Interesting work! I would guess that there are a lot of cameras with an > accelerometer or gyroscope that could report the rotation. > I think only the Streamcam in the UVC world, but who knows. :) > On 8/3/23 23:28, Gergő Köteles wrote: > > Hi, > > > > Logitech Streamcam can be mounted in 'portrait mode' as well. > > It reports the current roll (-90, 0, 90, 180) with > > UVC_CT_ROLL_ABSOLUTE_CONTROL. > > > > This RFC defines V4L2_CID_ROLL_ABSOLUTE, and maps > > UVC_CT_ROLL_ABSOLUTE_CONTROL to make it available to > > userspace. > > Then, the userspace can rotate the stream based on the roll. > > Should we also discuss pitch and yaw while we are at it? > They are there with V4L2_CID_PAN_ABSOLUTE and V4L2_CID_TILT_ABSOLUTE. > As far as I know there are controls to set pan and tilt of a PTZ camera, > but there are no controls that report those angles. > Aren't real PTZ cameras using the CT_PANTILT_ABSOLUTE_CONTROL for panning and tilting? Or just to move the crop window? > > Is it better to use V4L2_CID_CAMERA_SENSOR_ROTATION for this? > > IMHO that would make sense. > > Best regards, > Michael > > > The value set matches that control. > > If yes, is it worth mapping UVC_CT_ROLL_ABSOLUTE_CONTROL to > > V4L2_CID_CAMERA_SENSOR_ROTATION for this camera only? > > > > Any feedback is greately appreciated. > > > > > > Gergő Köteles (2): > > media: v4l2: ctrls: Add ROLL_ABSOLUTE control > > media: v4l2: map UVC_CT_ROLL_ABSOLUTE_CONTROL > > > > .../userspace-api/media/v4l/ext-ctrls-camera.rst | 5 +++++ > > drivers/media/usb/uvc/uvc_ctrl.c | 9 +++++++++ > > drivers/media/v4l2-core/v4l2-ctrls-defs.c | 1 + > > include/uapi/linux/v4l2-controls.h | 2 ++ > > 4 files changed, 17 insertions(+) > > > > > > base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5