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Subject: Re: [PATCH 7/8] media: hevc: Add scaling matrix control
To:     =?UTF-8?Q?Jernej_=c5=a0krabec?= <jernej.skrabec@gmail.com>,
        hverkuil@xs4all.nl, ezequiel@collabora.com, p.zabel@pengutronix.de,
        mchehab@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de,
        festevam@gmail.com, gregkh@linuxfoundation.org, mripard@kernel.org,
        paul.kocialkowski@bootlin.com, wens@csie.org,
        jernej.skrabec@siol.net, emil.l.velikov@gmail.com,
        andrzej.p@collabora.com, jc@kynesim.co.uk
Cc:     kernel@pengutronix.de, linux-imx@nxp.com,
        linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20210604130619.491200-1-benjamin.gaignard@collabora.com>
 <20210604130619.491200-8-benjamin.gaignard@collabora.com>
 <2618802.xq3rs0cueg@kista>
From:   Benjamin Gaignard <benjamin.gaignard@collabora.com>
Message-ID: <ec4f601e-9c21-2b46-91c9-e798a18e909e@collabora.com>
Date:   Mon, 7 Jun 2021 09:23:23 +0200
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Le 06/06/2021 à 09:49, Jernej Škrabec a écrit :
> Hi!
>
> Dne petek, 04. junij 2021 ob 15:06:18 CEST je Benjamin Gaignard napisal(a):
>> HEVC scaling lists are used for the scaling process for transform
>> coefficients.
>> V4L2_HEVC_SPS_FLAG_SCALING_LIST_ENABLED has to set when they are
>> encoded in the bitstream.
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
>> ---
>>   .../media/v4l/ext-ctrls-codec.rst             | 45 +++++++++++++++++++
>>   .../media/v4l/vidioc-queryctrl.rst            |  6 +++
>>   drivers/media/v4l2-core/v4l2-ctrls-core.c     |  6 +++
>>   drivers/media/v4l2-core/v4l2-ctrls-defs.c     |  4 ++
>>   include/media/hevc-ctrls.h                    | 11 +++++
>>   5 files changed, 72 insertions(+)
>>
>> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/
> Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> index 9120c5bcaf90..a4512b7cb520 100644
>> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> @@ -3065,6 +3065,51 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
>>   
>>       \normalsize
>>   
>> +``V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX (struct)``
>> +    Specifies the HEVC scaling matrix parameters used for the scaling
> process
>> +    for transform coefficients.
>> +    These matrix and parameters are defined according to :ref:`hevc`.
>> +    They are described in section 7.4.5 "Scaling list data semantics" of
>> +    the specification.
>> +
>> +.. c:type:: v4l2_ctrl_hevc_scaling_matrix
>> +
>> +.. raw:: latex
>> +
>> +    \scriptsize
>> +
>> +.. tabularcolumns:: |p{5.4cm}|p{6.8cm}|p{5.1cm}|
>> +
>> +.. cssclass:: longtable
>> +
>> +.. flat-table:: struct v4l2_ctrl_hevc_slice_params
> ^ copy paste error? It should be v4l2_ctrl_hevc_scaling_matrix.

Yes I will fix it in the next version.
Thanks

Benjamin

>
> Best regards,
> Jernej
>
>> +    :header-rows:  0
>> +    :stub-columns: 0
>> +    :widths:       1 1 2
>> +
>> +    * - __u8
>> +      - ``scaling_list_4x4[6][16]``
>> +      -
>> +    * - __u8
>> +      - ``scaling_list_8x8[6][64]``
>> +      -
>> +    * - __u8
>> +      - ``scaling_list_16x16[6][64]``
>> +      -
>> +    * - __u8
>> +      - ``scaling_list_32x32[2][64]``
>> +      -
>> +    * - __u8
>> +      - ``scaling_list_dc_coef_16x16[6]``
>> +      -
>> +    * - __u8
>> +      - ``scaling_list_dc_coef_32x32[2]``
>> +      -
>> +
>> +.. raw:: latex
>> +
>> +    \normalsize
>> +
>>   .. c:type:: v4l2_hevc_dpb_entry
>>   
>>   .. raw:: latex
>> diff --git a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst b/
> Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
>> index f9ecf6276129..2f491c17dd5d 100644
>> --- a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
>> +++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
>> @@ -495,6 +495,12 @@ See also the examples in :ref:`control`.
>>         - n/a
>>         - A struct :c:type:`v4l2_ctrl_hevc_slice_params`, containing HEVC
>>   	slice parameters for stateless video decoders.
>> +    * - ``V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX``
>> +      - n/a
>> +      - n/a
>> +      - n/a
>> +      - A struct :c:type:`v4l2_ctrl_hevc_scaling_matrix`, containing HEVC
>> +	scaling matrix for stateless video decoders.
>>       * - ``V4L2_CTRL_TYPE_VP8_FRAME``
>>         - n/a
>>         - n/a
>> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-core.c b/drivers/media/v4l2-
> core/v4l2-ctrls-core.c
>> index c4b5082849b6..70adfc1b9c81 100644
>> --- a/drivers/media/v4l2-core/v4l2-ctrls-core.c
>> +++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c
>> @@ -687,6 +687,9 @@ static int std_validate_compound(const struct v4l2_ctrl
> *ctrl, u32 idx,
>>   
>>   		break;
>>   
>> +	case V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX:
>> +		break;
>> +
>>   	case V4L2_CTRL_TYPE_AREA:
>>   		area = p;
>>   		if (!area->width || !area->height)
>> @@ -1240,6 +1243,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct
> v4l2_ctrl_handler *hdl,
>>   	case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
>>   		elem_size = sizeof(struct v4l2_ctrl_hevc_slice_params);
>>   		break;
>> +	case V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX:
>> +		elem_size = sizeof(struct
> v4l2_ctrl_hevc_scaling_matrix);
>> +		break;
>>   	case V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS:
>>   		elem_size = sizeof(struct
> v4l2_ctrl_hevc_decode_params);
>>   		break;
>> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-
> core/v4l2-ctrls-defs.c
>> index b6344bbf1e00..cb29c2a7fabe 100644
>> --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
>> +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
>> @@ -996,6 +996,7 @@ const char *v4l2_ctrl_get_name(u32 id)
>>   	case V4L2_CID_MPEG_VIDEO_HEVC_SPS:			
> return "HEVC Sequence Parameter Set";
>>   	case V4L2_CID_MPEG_VIDEO_HEVC_PPS:			
> return "HEVC Picture Parameter Set";
>>   	case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS:		return
> "HEVC Slice Parameters";
>> +	case V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX:		
> return "HEVC Scaling Matrix";
>>   	case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS:		
> return "HEVC Decode Parameters";
>>   	case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE:		return "HEVC
> Decode Mode";
>>   	case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE:		return
> "HEVC Start Code";
>> @@ -1488,6 +1489,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum
> v4l2_ctrl_type *type,
>>   	case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS:
>>   		*type = V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS;
>>   		break;
>> +	case V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX:
>> +		*type = V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX;
>> +		break;
>>   	case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS:
>>   		*type = V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS;
>>   		break;
>> diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
>> index dc964ff7cd29..da6189ef7ab4 100644
>> --- a/include/media/hevc-ctrls.h
>> +++ b/include/media/hevc-ctrls.h
>> @@ -19,6 +19,7 @@
>>   #define V4L2_CID_MPEG_VIDEO_HEVC_SPS		(V4L2_CID_CODEC_BASE +
> 1008)
>>   #define V4L2_CID_MPEG_VIDEO_HEVC_PPS		(V4L2_CID_CODEC_BASE +
> 1009)
>>   #define V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS	(V4L2_CID_CODEC_BASE +
> 1010)
>> +#define V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX	(V4L2_CID_CODEC_BASE +
> 1011)
>>   #define V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS	(V4L2_CID_CODEC_BASE +
> 1012)
>>   #define V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE	(V4L2_CID_CODEC_BASE +
> 1015)
>>   #define V4L2_CID_MPEG_VIDEO_HEVC_START_CODE	(V4L2_CID_CODEC_BASE +
> 1016)
>> @@ -27,6 +28,7 @@
>>   #define V4L2_CTRL_TYPE_HEVC_SPS 0x0120
>>   #define V4L2_CTRL_TYPE_HEVC_PPS 0x0121
>>   #define V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS 0x0122
>> +#define V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX 0x0123
>>   #define V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS 0x0124
>>   
>>   enum v4l2_mpeg_video_hevc_decode_mode {
>> @@ -225,6 +227,15 @@ struct v4l2_ctrl_hevc_decode_params {
>>   	__u64	flags;
>>   };
>>   
>> +struct v4l2_ctrl_hevc_scaling_matrix {
>> +	__u8	scaling_list_4x4[6][16];
>> +	__u8	scaling_list_8x8[6][64];
>> +	__u8	scaling_list_16x16[6][64];
>> +	__u8	scaling_list_32x32[2][64];
>> +	__u8	scaling_list_dc_coef_16x16[6];
>> +	__u8	scaling_list_dc_coef_32x32[2];
>> +};
>> +
>>   /*  MPEG-class control IDs specific to the Hantro driver as defined by V4L2
> */
>>   #define V4L2_CID_CODEC_HANTRO_BASE				
> (V4L2_CTRL_CLASS_CODEC | 0x1200)
>>   /*
>>
>