From patchwork Wed Feb 9 14:10:25 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomasz Stanislawski X-Patchwork-Id: 544091 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p19EAfdY000523 for ; Wed, 9 Feb 2011 14:10:41 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755323Ab1BIOKh (ORCPT ); Wed, 9 Feb 2011 09:10:37 -0500 Received: from mailout4.w1.samsung.com ([210.118.77.14]:17783 "EHLO mailout4.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755009Ab1BIOKf (ORCPT ); Wed, 9 Feb 2011 09:10:35 -0500 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: TEXT/PLAIN Received: from spt2.w1.samsung.com ([210.118.77.14]) by mailout4.w1.samsung.com (Sun Java(tm) System Messaging Server 6.3-8.04 (built Jul 29 2009; 32bit)) with ESMTP id <0LGC00M9ISPJPA70@mailout4.w1.samsung.com> for linux-media@vger.kernel.org; Wed, 09 Feb 2011 14:10:32 +0000 (GMT) Received: from linux.samsung.com ([106.116.38.10]) by spt2.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0LGC0017SSPIKL@spt2.w1.samsung.com> for linux-media@vger.kernel.org; Wed, 09 Feb 2011 14:10:31 +0000 (GMT) Received: from mcdsrvbld02.digital.local (unknown [106.116.37.23]) by linux.samsung.com (Postfix) with ESMTP id 26186270064; Wed, 09 Feb 2011 15:11:28 +0100 (CET) Date: Wed, 09 Feb 2011 15:10:25 +0100 From: Tomasz Stanislawski Subject: [PATCH] v4l: Documentation for the NV12T multiplane format To: linux-media@vger.kernel.org Cc: m.szyprowski@samsung.com, t.stanislaws@samsung.com, kyungmin.park@samsung.com, k.debski@samsung.com Message-id: <1297260625-17093-1-git-send-email-t.stanislaws@samsung.com> X-Mailer: git-send-email 1.7.2.3 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Greylist: IP, sender and 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This format has two planes - one for luminance and one for +chrominance. Chroma samples are interleaved. The difference to +V4L2_PIX_FMT_NV12 is the memory layout. Pixels are +grouped in macroblocks of 64x32 size. The order of macroblocks in memory is +also not standard. + + + + Description + + This is the two-plane versions of the YUV 4:2:0 format where data +is grouped into 64x32 macroblocks. The three components are separated into two +sub-images or planes. The Y plane has one byte per pixel and pixels are grouped +into 64x32 macroblocks. The CbCr plane has the same width, in bytes, as the Y +plane (and the image), but is half as tall in pixels. The chroma plane is also +grouped into 64x32 macroblocks. + Width of the buffer has to be aligned to the multiple of 128, and +height alignment is 32. Every four adjactent buffers - two horizontally and two +vertically are grouped together and are located in memory in Z or flipped Z +order. + Layout of macroblocks in memory is presented in the following +figure. +
+ <constant>V4L2_PIX_FMT_NV12MT</constant> macroblock Z shape +memory layout + + + + + +
+ The requirement that width is multiple 128 is implemnted because, the Z +shape cannot be cut in half horizontally. In case the vertical resolution is +macroblocks is odd then the last row of macroblocks is arranged in a linear +order. + In case of chroma the layout is identical. Cb and Cr samples are +interleaved. Height of the buffer is aligned to 32. + + + Memory layout of macroblocks in <constant>V4L2_PIX_FMT_NV12 +</constant> format pixel image - extreme case + +
+ Example <constant>V4L2_PIX_FMT_NV12MT</constant> memory +layout of macroblocks + + + + + +
+ Memory layout of macroblocks of V4L2_PIX_FMT_NV12MT + format in most extreme case. + + + + + + diff --git a/Documentation/DocBook/v4l/pixfmt.xml b/Documentation/DocBook/v4l/pixfmt.xml index d7c4671..3a9d068 100644 --- a/Documentation/DocBook/v4l/pixfmt.xml +++ b/Documentation/DocBook/v4l/pixfmt.xml @@ -603,6 +603,7 @@ information. &sub-yuv422p; &sub-yuv411p; &sub-nv12; + &sub-nv12mt; &sub-nv16;