linux-kernel - Re: [PATCH v12 11/17] media: uapi: Add V4L2_CID_STATELESS_HEVC_ENTRY_POINT

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Message-ID: <5e346689-5a0c-8fc7-129d-53a6f28e5349@collabora.com>
Date:   Fri, 8 Jul 2022 18:00:24 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     Jernej Škrabec <jernej.skrabec@...il.com>,
        mchehab@...nel.org, hverkuil@...all.nl,
        ezequiel@...guardiasur.com.ar, p.zabel@...gutronix.de,
        gregkh@...uxfoundation.org, mripard@...nel.org,
        paul.kocialkowski@...tlin.com, wens@...e.org, samuel@...lland.org,
        nicolas.dufresne@...labora.com, andrzej.p@...labora.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        kernel@...labora.com
Subject: Re: [PATCH v12 11/17] media: uapi: Add
 V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSETS control


Le 08/07/2022 à 16:02, Jernej Škrabec a écrit :
> Hi Benjamin!
>
> Dne petek, 08. julij 2022 ob 14:05:48 CEST je Benjamin Gaignard napisal(a):
>> The number of 'entry point offset' can be very variable.
>> Instead of using a large static array define a v4l2 dynamic array
>> of U32 (V4L2_CTRL_TYPE_U32).
>> The number of entry point offsets is reported by the elems field
>> and in struct v4l2_ctrl_hevc_slice_params.num_entry_point_offsets
>> field.
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
>> Acked-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
>> Tested-by: Jernej Skrabec <jernej.skrabec@...il.com>
>> ---
>> version 12:
>> - Reword num_entry_point_offsets documentation
>>
>>   .../userspace-api/media/v4l/ext-ctrls-codec.rst     | 13 +++++++++++++
>>   drivers/media/v4l2-core/v4l2-ctrls-defs.c           |  5 +++++
>>   include/media/hevc-ctrls.h                          |  5 ++++-
>>   3 files changed, 22 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst index
>> c2e0adece613..0cd967126fdf 100644
>> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> @@ -3010,6 +3010,11 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
>>       * - __u32
>>         - ``data_bit_offset``
>>         - Offset (in bits) to the video data in the current slice data.
>> +    * - __u32
>> +      - ``num_entry_point_offsets``
>> +      - Specifies the number of entry point offset syntax elements in the
>> slice header. +        When the driver supports it, the
>> ``V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSETS`` +        must be set.
>>       * - __u8
>>         - ``nal_unit_type``
>>         - Specifies the coding type of the slice (B, P or I).
>> @@ -3150,6 +3155,14 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
>>
>>       \normalsize
>>
>> +``V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSETS (integer)``
>> +    Specifies entry point offsets in bytes.
>> +    This control is a dynamically sized array. The number of entry point
>> +    offsets is reported by the ``elems`` field.
>> +    This bitstream parameter is defined according to :ref:`hevc`.
>> +    They are described in section 7.4.7.1 "General slice segment header
>> +    semantics" of the specification.
> You forgot to update above description per Ezequiel comment.

No it was num_entry_point_offsets which was needed to be updated
not this control.

Regards,
Benjamin

>
> Best regards,
> Jernej
>
>> +
>>   ``V4L2_CID_STATELESS_HEVC_SCALING_MATRIX (struct)``
>>       Specifies the HEVC scaling matrix parameters used for the scaling
>> process for transform coefficients.
>> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
>> b/drivers/media/v4l2-core/v4l2-ctrls-defs.c index
>> d594efbcbb93..e22921e7ea61 100644
>> --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
>> +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
>> @@ -1188,6 +1188,7 @@ const char *v4l2_ctrl_get_name(u32 id)
>>   	case V4L2_CID_STATELESS_HEVC_DECODE_PARAMS:		return
> "HEVC Decode
>> Parameters"; case V4L2_CID_STATELESS_HEVC_DECODE_MODE:		return
> "HEVC Decode
>> Mode"; case V4L2_CID_STATELESS_HEVC_START_CODE:		return
> "HEVC Start Code";
>> +	case V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSETS:	return
> "HEVC Entry
>> Point Offsets";
>>
>>   	/* Colorimetry controls */
>>   	/* Keep the order of the 'case's the same as in v4l2-controls.h!
> */
>> @@ -1518,6 +1519,10 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum
>> v4l2_ctrl_type *type, case V4L2_CID_STATELESS_HEVC_DECODE_PARAMS:
>>   		*type = V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS;
>>   		break;
>> +	case V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSETS:
>> +		*type = V4L2_CTRL_TYPE_U32;
>> +		*flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY;
>> +		break;
>>   	case V4L2_CID_STATELESS_VP9_COMPRESSED_HDR:
>>   		*type = V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR;
>>   		break;
>> diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
>> index a372c184689e..3a6601a46ced 100644
>> --- a/include/media/hevc-ctrls.h
>> +++ b/include/media/hevc-ctrls.h
>> @@ -20,6 +20,7 @@
>>   #define V4L2_CID_STATELESS_HEVC_DECODE_PARAMS	(V4L2_CID_CODEC_BASE
> + 1012)
>>   #define V4L2_CID_STATELESS_HEVC_DECODE_MODE	(V4L2_CID_CODEC_BASE + 1015)
>>   #define V4L2_CID_STATELESS_HEVC_START_CODE	(V4L2_CID_CODEC_BASE + 1016)
>> +#define V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSETS (V4L2_CID_CODEC_BASE +
>> 1017)
>>
>>   /* enum v4l2_ctrl_type type values */
>>   #define V4L2_CTRL_TYPE_HEVC_SPS 0x0120
>> @@ -316,6 +317,8 @@ struct v4l2_hevc_pred_weight_table {
>>    *
>>    * @bit_size: size (in bits) of the current slice data
>>    * @data_bit_offset: offset (in bits) to the video data in the current
>> slice data + * @num_entry_point_offsets: specifies the number of entry
>> point offset syntax + *			     elements in the slice
> header.
>>    * @nal_unit_type: specifies the coding type of the slice (B, P or I)
>>    * @nuh_temporal_id_plus1: minus 1 specifies a temporal identifier for the
>> NAL unit * @slice_type: see V4L2_HEVC_SLICE_TYPE_{}
>> @@ -358,7 +361,7 @@ struct v4l2_hevc_pred_weight_table {
>>   struct v4l2_ctrl_hevc_slice_params {
>>   	__u32	bit_size;
>>   	__u32	data_bit_offset;
>> -
>> +	__u32	num_entry_point_offsets;
>>   	/* ISO/IEC 23008-2, ITU-T Rec. H.265: NAL unit header */
>>   	__u8	nal_unit_type;
>>   	__u8	nuh_temporal_id_plus1;
>
>
>