From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rhee, C. Joon" Subject: Re: YUV Framebuffer Date: Wed, 17 Oct 2007 10:07:55 -0700 Message-ID: <27AAC353AE72C840926448157F375E72012B5A8F@NAEX17.na.qualcomm.com> References: <27AAC353AE72C840926448157F375E72012B59B1@NAEX17.na.qualcomm.com> Reply-To: linux-fbdev-devel@lists.sourceforge.net Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.91] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1IiCR1-00047F-3S for linux-fbdev-devel@lists.sourceforge.net; Wed, 17 Oct 2007 10:11:55 -0700 Received: from ithilien.qualcomm.com ([129.46.51.59]) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1IiCNP-00079M-IS for linux-fbdev-devel@lists.sourceforge.net; Wed, 17 Oct 2007 10:08:12 -0700 Content-class: urn:content-classes:message In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-fbdev-devel-bounces@lists.sourceforge.net Errors-To: linux-fbdev-devel-bounces@lists.sourceforge.net To: geert@linux-m68k.org Cc: Linux Frame Buffer Device Development Hi, Interleaved means YCBCR is on the same plane in this order. Y CB Y CR Y CB Y CR.... (TV-Out) The problem of matching Y=G, CB=B and CR=R for RGB offset is that the pixel cannot be represented directly since CB/CR gets shared between Ys. So, bitsperpixel would be 16 bit and both B and R offset will be 8. Joon -----Original Message----- From: geert@linux-m68k.org [mailto:geert@linux-m68k.org] Sent: Tuesday, October 16, 2007 11:58 PM To: Rhee, C. Joon Cc: Linux Frame Buffer Device Development Subject: Re: [Linux-fbdev-devel] YUV Framebuffer On Tue, 16 Oct 2007, Rhee, C. Joon wrote: > Is it possible to create framebuffer color format in YUV (eg. YUV422 > interleaved) and expose it through /dev/fb? > > What would be fb_info type? What do you mean with `interleaved'? Even and odd frames are separate (interlace)? For YUV422, you have to add a new visual type. A long time ago, I used this for a non-public test project: #define FB_TYPE_PACKED_PIXELS_LACED 5 /* Interlaced Packed Pixels */ #define FB_TYPE_PACKED_PIXELS_4AREAS 6 /* 4 areas of Packed Pixels */ #define FB_VISUAL_YCBCR422 6 /* YCbCr 4:2:2 */ #define FB_VISUAL_YCBCR420 7 /* YCbCr 4:2:0 */ > And how about about fb_var_screeninfo.green/blue/red offset? Just assume red, green, and blue mean Y, U, and V? Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/