Hi Ramesh,
Thank you for the patch.
On Wednesday 12 Oct 2016 15:10:29 Ramesh Shanmugasundaram wrote:
> This patch adds documentation for the three new SDR formats
>
> V4L2_SDR_FMT_SCU16BE
> V4L2_SDR_FMT_SCU18BE
> V4L2_SDR_FMT_SCU20BE
>
> Signed-off-by: Ramesh Shanmugasundaram
> <ramesh.shanmugasundaram@xxxxxxxxxxxxxx> ---
> .../media/uapi/v4l/pixfmt-sdr-scu16be.rst | 44 ++++++++++++++++++
> .../media/uapi/v4l/pixfmt-sdr-scu18be.rst | 48 +++++++++++++++++++
> .../media/uapi/v4l/pixfmt-sdr-scu20be.rst | 48 +++++++++++++++++++
> Documentation/media/uapi/v4l/sdr-formats.rst | 3 ++
> 4 files changed, 143 insertions(+)
> create mode 100644 Documentation/media/uapi/v4l/pixfmt-sdr-scu16be.rst
> create mode 100644 Documentation/media/uapi/v4l/pixfmt-sdr-scu18be.rst
> create mode 100644 Documentation/media/uapi/v4l/pixfmt-sdr-scu20be.rst
>
> diff --git a/Documentation/media/uapi/v4l/pixfmt-sdr-scu16be.rst
> b/Documentation/media/uapi/v4l/pixfmt-sdr-scu16be.rst new file mode 100644
> index 0000000..d6c2123
> --- /dev/null
> +++ b/Documentation/media/uapi/v4l/pixfmt-sdr-scu16be.rst
> @@ -0,0 +1,44 @@
> +.. -*- coding: utf-8; mode: rst -*-
> +
> +.. _V4L2-SDR-FMT-SCU16BE:
> +
> +******************************
> +V4L2_SDR_FMT_SCU16BE ('SCU16')
The value between parentheses is the ASCII representation of the 4CC, it
should be SC16. Same comment for the other formats.
> +******************************
> +
> +Sliced 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. I value
> +starts first and Q value starts at an offset equalling half of the buffer
> +size. 14 bit data is stored in 16 bit space with unused stuffed bits
> +padded with 0.
Please specify here how the 14-bit numbers are aligned (i.e. padding in bits
15:14 or bits 1:0 or any other strange option). Same comment for the other
formats.
> +
> +**Byte Order.**
> +Each cell is one byte.
> +
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> +
> + - .. row 1
Please use the more compact table stable
* - start + 0:
- I'\ :sub:`0[D13:D6]`
...
Same comment for the other formats.
> +
> + - start + 0:
> +
> + - I'\ :sub:`0[D13:D6]`
> +
> + - I'\ :sub:`0[D5:D0]`
> +
> + - .. row 2
> +
> + - start + buffer_size/2:
> +
> + - Q'\ :sub:`0[D13:D6]`
> +
> + - Q'\ :sub:`0[D5:D0]`
The format looks planar, does it use one V4L2 plane (as does NV12) or two V4L2
planes (as does NV12M) ? Same question for the other formats.
> diff --git a/Documentation/media/uapi/v4l/pixfmt-sdr-scu18be.rst
> b/Documentation/media/uapi/v4l/pixfmt-sdr-scu18be.rst new file mode 100644
> index 0000000..e6e0aff
> --- /dev/null
> +++ b/Documentation/media/uapi/v4l/pixfmt-sdr-scu18be.rst
> @@ -0,0 +1,48 @@
> +.. -*- coding: utf-8; mode: rst -*-
> +
> +.. _V4L2-SDR-FMT-SCU18BE:
> +
> +******************************
> +V4L2_SDR_FMT_SCU18BE ('SCU18')
> +******************************
> +
> +Sliced 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. I value
> +starts first and Q value starts at an offset equalling half of the buffer
> +size. 16 bit data is stored in 18 bit space with unused stuffed bits
> +padded with 0.
Your example below suggests that 18 bit data is stored in 24 bits. Similar
comment for SCU20.
> +
> +**Byte Order.**
> +Each cell is one byte.
> +
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> +
> + - .. row 1
> +
> + - start + 0:
> +
> + - I'\ :sub:`0[D17:D10]`
> +
> + - I'\ :sub:`0[D9:D2]`
> +
> + - I'\ :sub:`0[D1:D0]`
> +
> + - .. row 2
> +
> + - start + buffer_size/2:
> +
> + - Q'\ :sub:`0[D17:D10]`
> +
> + - Q'\ :sub:`0[D9:D2]`
> +
> + - Q'\ :sub:`0[D1:D0]`
> diff --git a/Documentation/media/uapi/v4l/pixfmt-sdr-scu20be.rst
> b/Documentation/media/uapi/v4l/pixfmt-sdr-scu20be.rst new file mode 100644
> index 0000000..374e0a3
> --- /dev/null
> +++ b/Documentation/media/uapi/v4l/pixfmt-sdr-scu20be.rst
> @@ -0,0 +1,48 @@
> +.. -*- coding: utf-8; mode: rst -*-
> +
> +.. _V4L2-SDR-FMT-SCU20BE:
> +
> +******************************
> +V4L2_SDR_FMT_SCU20BE ('SCU20')
> +******************************
> +
> +Sliced 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. I value
> +starts first and Q value starts at an offset equalling half of the buffer
> +size. 18 bit data is stored in 20 bit space with unused stuffed bits
> +padded with 0.
> +
> +**Byte Order.**
> +Each cell is one byte.
> +
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> +
> + - .. row 1
> +
> + - start + 0:
> +
> + - I'\ :sub:`0[D19:D12]`
> +
> + - I'\ :sub:`0[D11:D4]`
> +
> + - I'\ :sub:`0[D3:D0]`
> +
> + - .. row 2
> +
> + - start + buffer_size/2:
> +
> + - Q'\ :sub:`0[D19:D12]`
> +
> + - Q'\ :sub:`0[D11:D4]`
> +
> + - Q'\ :sub:`0[D3:D0]`
> diff --git a/Documentation/media/uapi/v4l/sdr-formats.rst
> b/Documentation/media/uapi/v4l/sdr-formats.rst index f863c08..4c01cf9
> 100644
> --- a/Documentation/media/uapi/v4l/sdr-formats.rst
> +++ b/Documentation/media/uapi/v4l/sdr-formats.rst
> @@ -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-scu16be
> + pixfmt-sdr-scu18be
> + pixfmt-sdr-scu20be
--
Regards,
Laurent Pinchart
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