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Date:   Wed, 25 Oct 2023 12:32:20 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Shengjiu Wang <shengjiu.wang@....com>, sakari.ailus@....fi,
        tfiga@...omium.org, m.szyprowski@...sung.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        shengjiu.wang@...il.com, Xiubo.Lee@...il.com, festevam@...il.com,
        nicoleotsuka@...il.com, lgirdwood@...il.com, broonie@...nel.org,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH v7 09/13] media: uapi: Add V4L2_CTRL_CLASS_M2M_AUDIO

On 20/10/2023 11:30, Shengjiu Wang wrote:
> The Audio M2M class includes controls for audio memory-to-memory
> use cases. The controls can be used for audio codecs, audio
> preprocessing, audio postprocessing.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> ---
>  .../userspace-api/media/v4l/common.rst        |  1 +
>  .../media/v4l/ext-ctrls-audio-m2m.rst         | 21 +++++++++++++++++++
>  .../media/v4l/vidioc-g-ext-ctrls.rst          |  4 ++++
>  drivers/media/v4l2-core/v4l2-ctrls-defs.c     |  4 ++++
>  include/uapi/linux/v4l2-controls.h            |  4 ++++
>  5 files changed, 34 insertions(+)
>  create mode 100644 Documentation/userspace-api/media/v4l/ext-ctrls-audio-m2m.rst
> 
> diff --git a/Documentation/userspace-api/media/v4l/common.rst b/Documentation/userspace-api/media/v4l/common.rst
> index ea0435182e44..d5366e96a596 100644
> --- a/Documentation/userspace-api/media/v4l/common.rst
> +++ b/Documentation/userspace-api/media/v4l/common.rst
> @@ -52,6 +52,7 @@ applicable to all devices.
>      ext-ctrls-fm-rx
>      ext-ctrls-detect
>      ext-ctrls-colorimetry
> +    ext-ctrls-audio-m2m
>      fourcc
>      format
>      planar-apis
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-audio-m2m.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-audio-m2m.rst
> new file mode 100644
> index 000000000000..82d2ecedbfee
> --- /dev/null
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-audio-m2m.rst
> @@ -0,0 +1,21 @@
> +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
> +
> +.. _audiom2m-controls:
> +
> +***************************
> +Audio M2M Control Reference
> +***************************
> +
> +The Audio M2M class includes controls for audio memory-to-memory
> +use cases. The controls can be used for audio codecs, audio
> +preprocessing, audio postprocessing.
> +
> +Audio M2M Control IDs
> +-----------------------
> +
> +.. _audiom2m-control-id:
> +
> +``V4L2_CID_M2M_AUDIO_CLASS (class)``
> +    The Audio M2M class descriptor. Calling
> +    :ref:`VIDIOC_QUERYCTRL` for this control will
> +    return a description of this control class.
> diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
> index f9f73530a6be..e8475f9fd2cf 100644
> --- a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
> +++ b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
> @@ -480,6 +480,10 @@ still cause this situation.
>        - 0xa50000
>        - The class containing colorimetry controls. These controls are
>  	described in :ref:`colorimetry-controls`.
> +    * - ``V4L2_CTRL_CLASS_M2M_AUDIO``
> +      - 0xa60000
> +      - The class containing audio m2m controls. These controls are
> +	described in :ref:`audiom2m-controls`.
>  
>  Return Value
>  ============
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> index 8696eb1cdd61..2a85ea3dc92f 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> @@ -1242,6 +1242,9 @@ const char *v4l2_ctrl_get_name(u32 id)
>  	case V4L2_CID_COLORIMETRY_CLASS:	return "Colorimetry Controls";
>  	case V4L2_CID_COLORIMETRY_HDR10_CLL_INFO:		return "HDR10 Content Light Info";
>  	case V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY:	return "HDR10 Mastering Display";
> +
> +	/* Audio M2M controls */
> +	case V4L2_CID_M2M_AUDIO_CLASS:  return "Audio M2M Controls";
>  	default:
>  		return NULL;
>  	}
> @@ -1451,6 +1454,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>  	case V4L2_CID_DETECT_CLASS:
>  	case V4L2_CID_CODEC_STATELESS_CLASS:
>  	case V4L2_CID_COLORIMETRY_CLASS:
> +	case V4L2_CID_M2M_AUDIO_CLASS:
>  		*type = V4L2_CTRL_TYPE_CTRL_CLASS;
>  		/* You can neither read nor write these */
>  		*flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index 68db66d4aae8..eb0f0a76f867 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -30,6 +30,7 @@
>  #define V4L2_CTRL_CLASS_DETECT		0x00a30000	/* Detection controls */
>  #define V4L2_CTRL_CLASS_CODEC_STATELESS 0x00a40000	/* Stateless codecs controls */
>  #define V4L2_CTRL_CLASS_COLORIMETRY	0x00a50000	/* Colorimetry controls */
> +#define V4L2_CTRL_CLASS_M2M_AUDIO	0x00a60000	/* Audio M2M controls */
>  
>  /* User-class control IDs */
>  
> @@ -3494,4 +3495,7 @@ struct v4l2_ctrl_av1_film_grain {
>  #define V4L2_CID_MPEG_MFC51_BASE        V4L2_CID_CODEC_MFC51_BASE
>  #endif
>  
> +#define V4L2_CID_M2M_AUDIO_CLASS_BASE  (V4L2_CTRL_CLASS_M2M_AUDIO | 0x900)
> +#define V4L2_CID_M2M_AUDIO_CLASS       (V4L2_CTRL_CLASS_M2M_AUDIO | 1)
> +

This should be moved up to before the #ifndef __KERNEL__. Those backwards compatibility
defines have to remain at the end of the header.

Regards,

	Hans

>  #endif

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