From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8EACAC433F8 for ; Fri, 10 Jul 2020 14:36:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 595FA20748 for ; Fri, 10 Jul 2020 14:36:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="F0mgxztF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727768AbgGJOgX (ORCPT ); Fri, 10 Jul 2020 10:36:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726908AbgGJOgW (ORCPT ); Fri, 10 Jul 2020 10:36:22 -0400 Received: from mail-qt1-x82a.google.com (mail-qt1-x82a.google.com [IPv6:2607:f8b0:4864:20::82a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AC564C08C5CE for ; Fri, 10 Jul 2020 07:36:22 -0700 (PDT) Received: by mail-qt1-x82a.google.com with SMTP id b25so4572467qto.2 for ; Fri, 10 Jul 2020 07:36:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-transfer-encoding:content-language; bh=GLA8hy0Mxnr5ois+m7iqZSoz9HaAK6soXtHyMxCCCIM=; b=F0mgxztFMPAYojlKB4OMbB4lHcuYJ1sXVegMYwRZHvSlnIagiT0HnXJkaSOApLNg0M x4DVbuy1yY+96TmPz++PL/w5gBJJD0cVmW5tBhOSRVZTEZPDGIn+hXNprAHu3iT27HUa 8JP4nB2dAPd+7gvyWJGeFdnhlpVi816JbeUmnvZepl4pDioiYxD90bIrsDHqjG0SSqEs jL1PT5iuBLpiMAwdAaUH5TPO7ZwW9d5I1yBFGKQVoVgII3C3EeMNnehU5flHoDlo/seC rrfw8q67D+bd9RyxvNId1jVYZpZCmZsC0SbsBwPSQq2ATPjmpeF6XTfH7tVIfOShlX+x BkYA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=GLA8hy0Mxnr5ois+m7iqZSoz9HaAK6soXtHyMxCCCIM=; b=Bv5AGz0l4hisbu1gtjuQAI9+mXhbFAbfzMf5ALRAwx9QRaRJc3vYnaCE9ViHOdRf1d XMf5FgMQXPHkPniF4K7isslZPbPBQWMdgtiYSXWltPg/4VZpesuONgw0ITk8ZPN46Cg2 xK11n6xpOUN403C62A76TwSG4KHKuHOEID2GJt68sDtFoIDjjQRDCn8WFEU6NX8DHqRn txhRQjunwFh8PL2ZeCre/9/VOFzBucmiAI7Zo/TRLm9pOy1uBuqrPcMVAFBdS4b5/beQ 2E5M8ToAsb30bPGnlxiTXYYO00NsrV+ehBl+bLNXmBsTLypYQttAKU5mO43rKnJJRfk4 hr3w== X-Gm-Message-State: AOAM533e8AFbGcvDbPBedZSgPVxC91PhRIY/4XUnU8ill1IkvGkQdxrC Sm1Iegn+WyX5up8Omi7lt3HixayfM6U= X-Google-Smtp-Source: ABdhPJzOGjJQ0eyd3Lk4S6BDr7fBQsMVhFh9tXWxtVkFqfpGJy+/TVQAC0A4QURDQhdFRAK2qR3eHA== X-Received: by 2002:aed:2f46:: with SMTP id l64mr37798487qtd.1.1594391781768; Fri, 10 Jul 2020 07:36:21 -0700 (PDT) Received: from [10.0.0.101] ([177.86.199.79]) by smtp.gmail.com with ESMTPSA id f203sm8096412qke.135.2020.07.10.07.36.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jul 2020 07:36:21 -0700 (PDT) Subject: Re: Range values for V4L2_CID_* commands To: Hans Verkuil , linux-media@vger.kernel.org References: <01fd7935-2793-c1a5-5aa3-4f453019394c@xs4all.nl> From: Lucas Message-ID: Date: Fri, 10 Jul 2020 11:36:17 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <01fd7935-2793-c1a5-5aa3-4f453019394c@xs4all.nl> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Thank you kind sir. On 10/07/2020 11:28, Hans Verkuil wrote: > On 10/07/2020 16:18, Lucas wrote: >> Hello, how do I obtain the accepted range of values for each V4L2_CID >> command? Take V4L2_CID_BRIGHTNESS as an example, how do I know what is >> the maximum and minimum values accepted for it? I have tried to use >> 'v4l2_ioctl(fd, VIDIOC_G_CTRL, &query);' thinking that would be stored >> in the maximum and minimum members for the struct v4l2_queryctrl but >> that does not appear to be the case as the values for those members are >> always zero. > Use VIDIOC_QUERYCTRL for that. See: > > https://linuxtv.org/downloads/v4l-dvb-apis-new/userspace-api/v4l/vidioc-queryctrl.html > > Regards, > > Hans