Description

These formats are designed to match the pixel formats of typical PC graphics frame buffers. They occupy 8, 16, 24 or 32 bits per pixel. These are all packed-pixel formats, meaning all the data for a pixel lie next to each other in memory.

When one of these formats is used, drivers shall report the colorspace V4L2_COLORSPACE_SRGB.

Bit 7 is the most significant bit. The value of the a = alpha bits is undefined when reading from the driver, ignored when writing to the driver, except when alpha blending has been negotiated for a Video Overlay or Video Output Overlay or when the alpha component has been configured for a Video Capture by means of V4L2_CID_ALPHA_COMPONENT control.

A test utility to determine which RGB formats a driver actually supports is available from the LinuxTV v4l-dvb repository. See http://linuxtv.org/repo/ for access instructions.