"Fossies" - the Fresh Open Source Software archive

Member "ltp-full-20120903/testcases/kernel/device-drivers/v4l/user_space/doc/spec/r5319.htm" of archive ltp-full-20120903.tar.gz:

Caution: In this restricted "Fossies" environment the current HTML page may not be correctly presentated and may have some non-functional links. Alternatively you can here view or download the uninterpreted source code. That can be also achieved for any archive member file by clicking within an archive contents listing on the first character of the file(path) respectively on the according byte size field.

Video for Linux Two API Specification: Revision 0.24
PrevNext

V4L2_PIX_FMT_YUV411P ('411P')

Name

V4L2_PIX_FMT_YUV411P -- Format with ¼ horizontal chroma resolution, also known as YUV 4:1:1. Planar layout as opposed to V4L2_PIX_FMT_Y41P

Description

This format is not commonly used. This is a planar format similar to the 4:2:2 planar format except with half as many chroma. The three components are separated into three sub-images or planes. The Y plane is first. The Y plane has one byte per pixel. The Cb plane immediately follows the Y plane in memory. The Cb plane is ¼ the width of the Y plane (and of the image). Each Cb belongs to 4 pixels all on the same row. For example, Cb0 belongs to Y'00, Y'01, Y'02 and Y'03. Following the Cb plane is the Cr plane, just like the Cb plane.

If the Y plane has pad bytes after each row, then the Cr and Cb planes have ¼ as many pad bytes after their rows. In other words, four C x rows (including padding) is exactly as long as one Y row (including padding).

Example 2-1. V4L2_PIX_FMT_YUV411P 4 × 4 pixel image

Byte Order. Each cell is one byte.

start + 0:Y'00Y'01Y'02Y'03
start + 4:Y'10Y'11Y'12Y'13
start + 8:Y'20Y'21Y'22Y'23
start + 12:Y'30Y'31Y'32Y'33
start + 16:Cb00   
start + 17:Cb10   
start + 18:Cb20   
start + 19:Cb30   
start + 20:Cr00   
start + 21:Cr10   
start + 22:Cr20   
start + 23:Cr30   

Color Sample Location.

 0 1 2 3
0Y YCY Y
1Y YCY Y
2Y YCY Y
3Y YCY Y

PrevHomeNext
V4L2_PIX_FMT_YUV422P ('422P')UpV4L2_PIX_FMT_NV12 ('NV12'), V4L2_PIX_FMT_NV21 ('NV21')