2.6.1. Packed YUV formats¶
2.6.1.1. Description¶
Similar to the packed RGB formats these formats store the Y, Cb and Cr component of each pixel in one 16 or 32 bit word.
| Identifier | Code | Byte 0 in memory | Byte 1 | Byte 2 | Byte 3 | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | ||
V4L2_PIX_FMT_YUV444 |
‘Y444’ | Cb3 | Cb2 | Cb1 | Cb0 | Cr3 | Cr2 | Cr1 | Cr0 | a3 | a2 | a1 | a0 | Y’3 | Y’2 | Y’1 | Y’0 | ||||||||||||||||
V4L2_PIX_FMT_YUV555 |
‘YUVO’ | Cb2 | Cb1 | Cb0 | Cr4 | Cr3 | Cr2 | Cr1 | Cr0 | a | Y’4 | Y’3 | Y’2 | Y’1 | Y’0 | Cb4 | Cb3 | ||||||||||||||||
V4L2_PIX_FMT_YUV565 |
‘YUVP’ | Cb2 | Cb1 | Cb0 | Cr4 | Cr3 | Cr2 | Cr1 | Cr0 | Y’4 | Y’3 | Y’2 | Y’1 | Y’0 | Cb5 | Cb4 | Cb3 | ||||||||||||||||
V4L2_PIX_FMT_YUV32 |
‘YUV4’ | a7 | a6 | a5 | a4 | a3 | a2 | a1 | a0 | Y’7 | Y’6 | Y’5 | Y’4 | Y’3 | Y’2 | Y’1 | Y’0 | Cb7 | Cb6 | Cb5 | Cb4 | Cb3 | Cb2 | Cb1 | Cb0 | Cr7 | Cr6 | Cr5 | Cr4 | Cr3 | Cr2 | Cr1 | Cr0 |
V4L2_PIX_FMT_AYUV32 |
‘AYUV’ | a7 | a6 | a5 | a4 | a3 | a2 | a1 | a0 | Y’7 | Y’6 | Y’5 | Y’4 | Y’3 | Y’2 | Y’1 | Y’0 | Cb7 | Cb6 | Cb5 | Cb4 | Cb3 | Cb2 | Cb1 | Cb0 | Cr7 | Cr6 | Cr5 | Cr4 | Cr3 | Cr2 | Cr1 | Cr0 |
V4L2_PIX_FMT_XYUV32 |
‘XYUV’ | Y’7 | Y’6 | Y’5 | Y’4 | Y’3 | Y’2 | Y’1 | Y’0 | Cb7 | Cb6 | Cb5 | Cb4 | Cb3 | Cb2 | Cb1 | Cb0 | Cr7 | Cr6 | Cr5 | Cr4 | Cr3 | Cr2 | Cr1 | Cr0 |
||||||||
V4L2_PIX_FMT_VUYA32 |
‘VUYA’ | Cr7 | Cr6 | Cr5 | Cr4 | Cr3 | Cr2 | Cr1 | Cr0 | Cb7 | Cb6 | Cb5 | Cb4 | Cb3 | Cb2 | Cb1 | Cb0 | Y’7 | Y’6 | Y’5 | Y’4 | Y’3 | Y’2 | Y’1 | Y’0 | a7 | a6 | a5 | a4 | a3 | a2 | a1 | a0 |
V4L2_PIX_FMT_VUYX32 |
‘VUYX’ | Cr7 | Cr6 | Cr5 | Cr4 | Cr3 | Cr2 | Cr1 | Cr0 | Cb7 | Cb6 | Cb5 | Cb4 | Cb3 | Cb2 | Cb1 | Cb0 | Y’7 | Y’6 | Y’5 | Y’4 | Y’3 | Y’2 | Y’1 | Y’0 | ||||||||
Note
- Bit 7 is the most significant bit;
- The value of 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 for the formats Y444, YUV555 and YUV4. However, for formats AYUV32 and VUYA32, the alpha component is expected to contain a meaningful value that can be used by drivers and applications. And, the formats XYUV32 and VUYX32 contain undefined alpha values that must be ignored by all applications and drivers.