Commit e744ee28 authored by Ramesh Shanmugasundaram's avatar Ramesh Shanmugasundaram Committed by Mauro Carvalho Chehab

[media] doc_rst: media: New SDR formats PC16, PC18 & PC20

This patch adds documentation for the three new SDR formats

V4L2_SDR_FMT_PCU16BE
V4L2_SDR_FMT_PCU18BE
V4L2_SDR_FMT_PCU20BE
Signed-off-by: default avatarRamesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
Signed-off-by: default avatarHans Verkuil <hansverk@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent c28f2118
.. -*- coding: utf-8; mode: rst -*-
.. _V4L2-SDR-FMT-PCU16BE:
******************************
V4L2_SDR_FMT_PCU16BE ('PC16')
******************************
Planar complex unsigned 16-bit big endian IQ sample
Description
===========
This format contains a sequence of complex number samples. Each complex
number consist of two parts called In-phase and Quadrature (IQ). Both I
and Q are represented as a 16 bit unsigned big endian number stored in
32 bit space. The remaining unused bits within the 32 bit space will be
padded with 0. I value starts first and Q value starts at an offset
equalling half of the buffer size (i.e.) offset = buffersize/2. Out of
the 16 bits, bit 15:2 (14 bit) is data and bit 1:0 (2 bit) can be any
value.
**Byte Order.**
Each cell is one byte.
.. flat-table::
:header-rows: 1
:stub-columns: 0
* - Offset:
- Byte B0
- Byte B1
- Byte B2
- Byte B3
* - start + 0:
- I'\ :sub:`0[13:6]`
- I'\ :sub:`0[5:0]; B1[1:0]=pad`
- pad
- pad
* - start + 4:
- I'\ :sub:`1[13:6]`
- I'\ :sub:`1[5:0]; B1[1:0]=pad`
- pad
- pad
* - ...
* - start + offset:
- Q'\ :sub:`0[13:6]`
- Q'\ :sub:`0[5:0]; B1[1:0]=pad`
- pad
- pad
* - start + offset + 4:
- Q'\ :sub:`1[13:6]`
- Q'\ :sub:`1[5:0]; B1[1:0]=pad`
- pad
- pad
.. -*- coding: utf-8; mode: rst -*-
.. _V4L2-SDR-FMT-PCU18BE:
******************************
V4L2_SDR_FMT_PCU18BE ('PC18')
******************************
Planar complex unsigned 18-bit big endian IQ sample
Description
===========
This format contains a sequence of complex number samples. Each complex
number consist of two parts called In-phase and Quadrature (IQ). Both I
and Q are represented as a 18 bit unsigned big endian number stored in
32 bit space. The remaining unused bits within the 32 bit space will be
padded with 0. I value starts first and Q value starts at an offset
equalling half of the buffer size (i.e.) offset = buffersize/2. Out of
the 18 bits, bit 17:2 (16 bit) is data and bit 1:0 (2 bit) can be any
value.
**Byte Order.**
Each cell is one byte.
.. flat-table::
:header-rows: 1
:stub-columns: 0
* - Offset:
- Byte B0
- Byte B1
- Byte B2
- Byte B3
* - start + 0:
- I'\ :sub:`0[17:10]`
- I'\ :sub:`0[9:2]`
- I'\ :sub:`0[1:0]; B2[5:0]=pad`
- pad
* - start + 4:
- I'\ :sub:`1[17:10]`
- I'\ :sub:`1[9:2]`
- I'\ :sub:`1[1:0]; B2[5:0]=pad`
- pad
* - ...
* - start + offset:
- Q'\ :sub:`0[17:10]`
- Q'\ :sub:`0[9:2]`
- Q'\ :sub:`0[1:0]; B2[5:0]=pad`
- pad
* - start + offset + 4:
- Q'\ :sub:`1[17:10]`
- Q'\ :sub:`1[9:2]`
- Q'\ :sub:`1[1:0]; B2[5:0]=pad`
- pad
.. -*- coding: utf-8; mode: rst -*-
.. _V4L2-SDR-FMT-PCU20BE:
******************************
V4L2_SDR_FMT_PCU20BE ('PC20')
******************************
Planar complex unsigned 20-bit big endian IQ sample
Description
===========
This format contains a sequence of complex number samples. Each complex
number consist of two parts called In-phase and Quadrature (IQ). Both I
and Q are represented as a 20 bit unsigned big endian number stored in
32 bit space. The remaining unused bits within the 32 bit space will be
padded with 0. I value starts first and Q value starts at an offset
equalling half of the buffer size (i.e.) offset = buffersize/2. Out of
the 20 bits, bit 19:2 (18 bit) is data and bit 1:0 (2 bit) can be any
value.
**Byte Order.**
Each cell is one byte.
.. flat-table::
:header-rows: 1
:stub-columns: 0
* - Offset:
- Byte B0
- Byte B1
- Byte B2
- Byte B3
* - start + 0:
- I'\ :sub:`0[19:12]`
- I'\ :sub:`0[11:4]`
- I'\ :sub:`0[3:0]; B2[3:0]=pad`
- pad
* - start + 4:
- I'\ :sub:`1[19:12]`
- I'\ :sub:`1[11:4]`
- I'\ :sub:`1[3:0]; B2[3:0]=pad`
- pad
* - ...
* - start + offset:
- Q'\ :sub:`0[19:12]`
- Q'\ :sub:`0[11:4]`
- Q'\ :sub:`0[3:0]; B2[3:0]=pad`
- pad
* - start + offset + 4:
- Q'\ :sub:`1[19:12]`
- Q'\ :sub:`1[11:4]`
- Q'\ :sub:`1[3:0]; B2[3:0]=pad`
- pad
......@@ -17,3 +17,6 @@ These formats are used for :ref:`SDR <sdr>` interface only.
pixfmt-sdr-cs08
pixfmt-sdr-cs14le
pixfmt-sdr-ru12le
pixfmt-sdr-pcu16be
pixfmt-sdr-pcu18be
pixfmt-sdr-pcu20be
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