From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mailout2.samsung.com ([203.254.224.25]:34119 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751949AbZBCKsp convert rfc822-to-8bit (ORCPT ); Tue, 3 Feb 2009 05:48:45 -0500 Received: from epmmp1 (mailout2.samsung.com [203.254.224.25]) by mailout2.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTP id <0KEH00K7LKP8R7@mailout2.samsung.com> for linux-media@vger.kernel.org; Tue, 03 Feb 2009 19:48:44 +0900 (KST) Received: from TNRNDGASPAPP1.tn.corp.samsungelectronics.net ([165.213.149.150]) by mmp1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0KEH00IAWKP4U2@mmp1.samsung.com> for linux-media@vger.kernel.org; Tue, 03 Feb 2009 19:48:40 +0900 (KST) Date: Tue, 03 Feb 2009 19:48:48 +0900 From: Dongsoo Kim Subject: Re: [V4L2] EV control API for digital camera In-reply-to: <200902031120.01937.laurent.pinchart@skynet.be> To: Laurent Pinchart Cc: Dongsoo Kim , Guennadi Liakhovetski , linux-media@vger.kernel.org, =?euc-kr?Q?=C7=FC=C1=D8_=B1=E8?= , jongse.won@samsung.com, kyungmin.park@samsung.com Reply-to: dongsoo45.kim@samsung.com Message-id: <1233658128.6845.20.camel@chromatix> MIME-version: 1.0 Content-type: text/plain; charset=UTF-8 Content-transfer-encoding: 8BIT References: <5e9665e10901281824ibccbf00lcbecba5b01fdcbea@mail.gmail.com> <200902031120.01937.laurent.pinchart@skynet.be> Sender: linux-media-owner@vger.kernel.org List-ID: On 화, 2009-02-03 at 11:20 +0100, Laurent Pinchart wrote: > Hi Nate, > > On Thursday 29 January 2009, Dongsoo Kim wrote: > > Thank you. > > > > So if V4L2_CID_EXPOSURE is for Exposure Value control, I think there > > is no api for exposure metering. right? > > V4L2_CID_EXPOSURE controls the exposure time. This is often implemented > through a mechanical or electronic shutter in the device. > > What kind of exposure metering do you have in mind ? Can you give us some > details ? I mean photometry which is all about light meter (or exposure meter). Like spot metering, center weighted things.. > > > Actually many of APIs for camera are missing I guess. > > You're probably right. The V4L1/V4L2 API have been developed for frame > grabbers and extended to webcams. Now that high-end digital cameras get USB > connectivity, the V4L2 API should be extended with new controls. Feel free to > submit proposals for discussion on the linux-media mailing list. > Thank you for you encouraging words. Actually I'm working on some ISP devices from NEC, Fujitsu. and ARM SOC camera interface peripheral like PXA3, S3C64XX, OMAP3.. I wish I could make a device very close to a real digital camera. It wouldn't take so long until I submit a RFC about V4L2 API for digital camera :) (I hope so at least) Cheers. Regards, Nate