On 09/06/2018 12:00 AM, Ezequiel Garcia wrote:
> From: Shunqian Zheng <zhengsq@xxxxxxxxxxxxxx>
>
> Add V4L2_CID_JPEG_QUANTIZATION compound control to allow userspace
> configure the JPEG quantization tables.
>
> Signed-off-by: Shunqian Zheng <zhengsq@xxxxxxxxxxxxxx>
> Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
> ---
> .../media/uapi/v4l/extended-controls.rst | 31 +++++++++++++++++++
> .../media/videodev2.h.rst.exceptions | 1 +
> drivers/media/v4l2-core/v4l2-ctrls.c | 10 ++++++
> include/uapi/linux/v4l2-controls.h | 12 +++++++
> include/uapi/linux/videodev2.h | 1 +
> 5 files changed, 55 insertions(+)
>
> diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst
> index 9f7312bf3365..1335d27d30f3 100644
> --- a/Documentation/media/uapi/v4l/extended-controls.rst
> +++ b/Documentation/media/uapi/v4l/extended-controls.rst
> @@ -3354,7 +3354,38 @@ JPEG Control IDs
> Specify which JPEG markers are included in compressed stream. This
> control is valid only for encoders.
>
> +.. _jpeg-quant-tables-control:
>
> +``V4L2_CID_JPEG_QUANTIZATION (struct)``
> + Specifies the luma and chroma quantization matrices for encoding
> + or decoding a V4L2_PIX_FMT_JPEG_RAW format buffer. The :ref:`itu-t81`
> + specification allows 8-bit quantization coefficients for
> + baseline profile images, and 8-bit or 16-bit for extended profile
> + images. Supporting or not 16-bit precision coefficients is driver-specific.
> + Coefficients must be set in JPEG zigzag scan order.
> +
> +
> +.. c:type:: struct v4l2_ctrl_jpeg_quantization
> +
> +.. cssclass:: longtable
> +
> +.. flat-table:: struct v4l2_ctrl_jpeg_quantization
> + :header-rows: 0
> + :stub-columns: 0
> + :widths: 1 1 2
> +
> + * - __u8
> + - ``precision``
> + - Specifies the coefficient precision. User shall set 0
> + for 8-bit, and 1 for 16-bit.
So does specifying 1 here switch the HW encoder to use extended profile?
What if the HW only supports baseline? The rockchip driver doesn't appear
to check the precision field at all...
I think this needs a bit more thought.
I am not at all sure that this is the right place for the precision field.
This is really about JPEG profiles, so I would kind of expect a JPEG PROFILE
control (just like other codec profiles), or possibly a new pixelformat for
extended profiles.
And based on that the driver would interpret these matrix values as 8 or
16 bits.
Regards,
Hans
> +
> + * - __u16
> + - ``luma_quantization_matrix[64]``
> + - Sets the luma quantization table.
> +
> + * - __u16
> + - ``chroma_quantization_matrix[64]``
> + - Sets the chroma quantization table.
>
> .. flat-table::
> :header-rows: 0
> diff --git a/Documentation/media/videodev2.h.rst.exceptions b/Documentation/media/videodev2.h.rst.exceptions
> index ca9f0edc579e..a0a38e92bf38 100644
> --- a/Documentation/media/videodev2.h.rst.exceptions
> +++ b/Documentation/media/videodev2.h.rst.exceptions
> @@ -129,6 +129,7 @@ replace symbol V4L2_CTRL_TYPE_STRING :c:type:`v4l2_ctrl_type`
> replace symbol V4L2_CTRL_TYPE_U16 :c:type:`v4l2_ctrl_type`
> replace symbol V4L2_CTRL_TYPE_U32 :c:type:`v4l2_ctrl_type`
> replace symbol V4L2_CTRL_TYPE_U8 :c:type:`v4l2_ctrl_type`
> +replace symbol V4L2_CTRL_TYPE_JPEG_QUANTIZATION :c:type:`v4l2_ctrl_type`
>
> # V4L2 capability defines
> replace define V4L2_CAP_VIDEO_CAPTURE device-capabilities
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index 599c1cbff3b9..305bd7a9b7f1 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -999,6 +999,7 @@ const char *v4l2_ctrl_get_name(u32 id)
> case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
> case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
> case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
> + case V4L2_CID_JPEG_QUANTIZATION: return "JPEG Quantization Tables";
>
> /* Image source controls */
> /* Keep the order of the 'case's the same as in v4l2-controls.h! */
> @@ -1286,6 +1287,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
> case V4L2_CID_DETECT_MD_REGION_GRID:
> *type = V4L2_CTRL_TYPE_U8;
> break;
> + case V4L2_CID_JPEG_QUANTIZATION:
> + *type = V4L2_CTRL_TYPE_JPEG_QUANTIZATION;
> + break;
> case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
> *type = V4L2_CTRL_TYPE_U16;
> break;
> @@ -1612,6 +1616,9 @@ static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
> return -ERANGE;
> return 0;
>
> + case V4L2_CTRL_TYPE_JPEG_QUANTIZATION:
> + return 0;
> +
> default:
> return -EINVAL;
> }
> @@ -2133,6 +2140,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
> case V4L2_CTRL_TYPE_U32:
> elem_size = sizeof(u32);
> break;
> + case V4L2_CTRL_TYPE_JPEG_QUANTIZATION:
> + elem_size = sizeof(struct v4l2_ctrl_jpeg_quantization);
> + break;
> default:
> if (type < V4L2_CTRL_COMPOUND_TYPES)
> elem_size = sizeof(s32);
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index e4ee10ee917d..856b3325052f 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -987,6 +987,18 @@ enum v4l2_jpeg_chroma_subsampling {
> #define V4L2_JPEG_ACTIVE_MARKER_DQT (1 << 17)
> #define V4L2_JPEG_ACTIVE_MARKER_DHT (1 << 18)
>
> +#define V4L2_CID_JPEG_QUANTIZATION (V4L2_CID_JPEG_CLASS_BASE + 5)
> +struct v4l2_ctrl_jpeg_quantization {
> + /* ITU-T.81 specifies two quantization coefficient precisions:
> + * 8-bit for baseline profile,
> + * 8-bit or 16-bit for extended profile.
> + *
> + * User shall set "precision" to 0 for 8-bit and 1 for 16-bit.
> + */
> + __u8 precision;
> + __u16 luma_quantization_matrix[64];
> + __u16 chroma_quantization_matrix[64];
> +};
>
> /* Image source controls */
> #define V4L2_CID_IMAGE_SOURCE_CLASS_BASE (V4L2_CTRL_CLASS_IMAGE_SOURCE | 0x900)
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index f9f3ae5b489e..8ace47cb1003 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -1637,6 +1637,7 @@ enum v4l2_ctrl_type {
> V4L2_CTRL_TYPE_U8 = 0x0100,
> V4L2_CTRL_TYPE_U16 = 0x0101,
> V4L2_CTRL_TYPE_U32 = 0x0102,
> + V4L2_CTRL_TYPE_JPEG_QUANTIZATION = 0x0103,
> };
>
> /* Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
>
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