[RFC PATCH v6 09/11] media: uapi: Add audio rate controls support
Shengjiu Wang
shengjiu.wang at gmail.com
Wed Oct 18 18:40:43 AEDT 2023
On Wed, Oct 18, 2023 at 3:31 PM Hans Verkuil <hverkuil at xs4all.nl> wrote:
>
> On 18/10/2023 09:23, Shengjiu Wang wrote:
> > On Wed, Oct 18, 2023 at 10:27 AM Shengjiu Wang <shengjiu.wang at gmail.com> wrote:
> >>
> >> On Tue, Oct 17, 2023 at 9:37 PM Hans Verkuil <hverkuil at xs4all.nl> wrote:
> >>>
> >>> On 17/10/2023 15:11, Shengjiu Wang wrote:
> >>>> On Mon, Oct 16, 2023 at 9:16 PM Hans Verkuil <hverkuil at xs4all.nl> wrote:
> >>>>>
> >>>>> Hi Shengjiu,
> >>>>>
> >>>>> On 13/10/2023 10:31, Shengjiu Wang wrote:
> >>>>>> Fixed point controls are used by the user to configure
> >>>>>> the audio sample rate to driver.
> >>>>>>
> >>>>>> Add V4L2_CID_ASRC_SOURCE_RATE and V4L2_CID_ASRC_DEST_RATE
> >>>>>> new IDs for ASRC rate control.
> >>>>>>
> >>>>>> Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>
> >>>>>> ---
> >>>>>> .../userspace-api/media/v4l/common.rst | 1 +
> >>>>>> .../media/v4l/ext-ctrls-fixed-point.rst | 36 +++++++++++++++++++
> >>>>>> .../media/v4l/vidioc-g-ext-ctrls.rst | 4 +++
> >>>>>> .../media/v4l/vidioc-queryctrl.rst | 7 ++++
> >>>>>> .../media/videodev2.h.rst.exceptions | 1 +
> >>>>>> drivers/media/v4l2-core/v4l2-ctrls-core.c | 5 +++
> >>>>>> drivers/media/v4l2-core/v4l2-ctrls-defs.c | 4 +++
> >>>>>> include/media/v4l2-ctrls.h | 2 ++
> >>>>>> include/uapi/linux/v4l2-controls.h | 13 +++++++
> >>>>>> include/uapi/linux/videodev2.h | 3 ++
> >>>>>> 10 files changed, 76 insertions(+)
> >>>>>> create mode 100644 Documentation/userspace-api/media/v4l/ext-ctrls-fixed-point.rst
> >>>>>>
> >>>>>> diff --git a/Documentation/userspace-api/media/v4l/common.rst b/Documentation/userspace-api/media/v4l/common.rst
> >>>>>> index ea0435182e44..35707edffb13 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-fixed-point
> >>>>>
> >>>>> Rename this to ext-ctrls-audio-m2m.
> >>>>>
> >>>>>> fourcc
> >>>>>> format
> >>>>>> planar-apis
> >>>>>> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-fixed-point.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-fixed-point.rst
> >>>>>> new file mode 100644
> >>>>>> index 000000000000..2ef6e250580c
> >>>>>> --- /dev/null
> >>>>>> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-fixed-point.rst
> >>>>>> @@ -0,0 +1,36 @@
> >>>>>> +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
> >>>>>> +
> >>>>>> +.. _fixed-point-controls:
> >>>>>> +
> >>>>>> +***************************
> >>>>>> +Fixed Point Control Reference
> >>>>>
> >>>>> This is for audio controls. "Fixed Point" is just the type, and it doesn't make
> >>>>> sense to group fixed point controls. But it does make sense to group the audio
> >>>>> controls.
> >>>>>
> >>>>> V4L2 controls can be grouped into classes. Basically it is a way to put controls
> >>>>> into categories, and for each category there is also a control that gives a
> >>>>> description of the class (see 2.15.15 in
> >>>>> https://linuxtv.org/downloads/v4l-dvb-apis-new/driver-api/v4l2-controls.html#introduction)
> >>>>>
> >>>>> If you use e.g. 'v4l2-ctl -l' to list all the controls, then you will see that
> >>>>> they are grouped based on what class of control they are.
> >>>>>
> >>>>> So I think it would be a good idea to create a new control class for M2M audio controls,
> >>>>> instead of just adding them to the catch-all 'User Controls' class.
> >>>>>
> >>>>> Search e.g. for V4L2_CTRL_CLASS_COLORIMETRY and V4L2_CID_COLORIMETRY_CLASS to see how
> >>>>> it is done.
> >>>>>
> >>>>> M2M_AUDIO would probably be a good name for the class.
> >>>>>
> >>>>>> +***************************
> >>>>>> +
> >>>>>> +These controls are intended to support an asynchronous sample
> >>>>>> +rate converter.
> >>>>>
> >>>>> Add ' (ASRC).' at the end to indicate the common abbreviation for
> >>>>> that.
> >>>>>
> >>>>>> +
> >>>>>> +.. _v4l2-audio-asrc:
> >>>>>> +
> >>>>>> +``V4L2_CID_ASRC_SOURCE_RATE``
> >>>>>> + sets the resampler source rate.
> >>>>>> +
> >>>>>> +``V4L2_CID_ASRC_DEST_RATE``
> >>>>>> + sets the resampler destination rate.
> >>>>>
> >>>>> Document the unit (Hz) for these two controls.
> >>>>>
> >>>>>> +
> >>>>>> +.. c:type:: v4l2_ctrl_fixed_point
> >>>>>> +
> >>>>>> +.. cssclass:: longtable
> >>>>>> +
> >>>>>> +.. tabularcolumns:: |p{1.5cm}|p{5.8cm}|p{10.0cm}|
> >>>>>> +
> >>>>>> +.. flat-table:: struct v4l2_ctrl_fixed_point
> >>>>>> + :header-rows: 0
> >>>>>> + :stub-columns: 0
> >>>>>> + :widths: 1 1 2
> >>>>>> +
> >>>>>> + * - __u32
> >>>>>
> >>>>> Hmm, shouldn't this be __s32?
> >>>>>
> >>>>>> + - ``integer``
> >>>>>> + - integer part of fixed point value.
> >>>>>> + * - __s32
> >>>>>
> >>>>> and this __u32?
> >>>>>
> >>>>> You want to be able to use this generic type as a signed value.
> >>>>>
> >>>>>> + - ``fractional``
> >>>>>> + - fractional part of fixed point value, which is Q31.
> >>>>>> 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..1811dabf5c74 100644
> >>>>>> --- a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
> >>>>>> +++ b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
> >>>>>> @@ -295,6 +295,10 @@ still cause this situation.
> >>>>>> - ``p_av1_film_grain``
> >>>>>> - A pointer to a struct :c:type:`v4l2_ctrl_av1_film_grain`. Valid if this control is
> >>>>>> of type ``V4L2_CTRL_TYPE_AV1_FILM_GRAIN``.
> >>>>>> + * - struct :c:type:`v4l2_ctrl_fixed_point` *
> >>>>>> + - ``p_fixed_point``
> >>>>>> + - A pointer to a struct :c:type:`v4l2_ctrl_fixed_point`. Valid if this control is
> >>>>>> + of type ``V4L2_CTRL_TYPE_FIXED_POINT``.
> >>>>>> * - void *
> >>>>>> - ``ptr``
> >>>>>> - A pointer to a compound type which can be an N-dimensional array
> >>>>>> diff --git a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
> >>>>>> index 4d38acafe8e1..9285f4f39eed 100644
> >>>>>> --- a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
> >>>>>> +++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
> >>>>>> @@ -549,6 +549,13 @@ See also the examples in :ref:`control`.
> >>>>>> - n/a
> >>>>>> - A struct :c:type:`v4l2_ctrl_av1_film_grain`, containing AV1 Film Grain
> >>>>>> parameters for stateless video decoders.
> >>>>>> + * - ``V4L2_CTRL_TYPE_FIXED_POINT``
> >>>>>> + - n/a
> >>>>>> + - n/a
> >>>>>> + - n/a
> >>>>>> + - A struct :c:type:`v4l2_ctrl_fixed_point`, containing parameter which has
> >>>>>> + integer part and fractional part, i.e. audio sample rate.
> >>>>>> +
> >>>>>>
> >>>>>> .. raw:: latex
> >>>>>>
> >>>>>> diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> >>>>>> index e61152bb80d1..2faa5a2015eb 100644
> >>>>>> --- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> >>>>>> +++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> >>>>>> @@ -167,6 +167,7 @@ replace symbol V4L2_CTRL_TYPE_AV1_SEQUENCE :c:type:`v4l2_ctrl_type`
> >>>>>> replace symbol V4L2_CTRL_TYPE_AV1_TILE_GROUP_ENTRY :c:type:`v4l2_ctrl_type`
> >>>>>> replace symbol V4L2_CTRL_TYPE_AV1_FRAME :c:type:`v4l2_ctrl_type`
> >>>>>> replace symbol V4L2_CTRL_TYPE_AV1_FILM_GRAIN :c:type:`v4l2_ctrl_type`
> >>>>>> +replace symbol V4L2_CTRL_TYPE_FIXED_POINT :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-core.c b/drivers/media/v4l2-core/v4l2-ctrls-core.c
> >>>>>> index a662fb60f73f..7a616ac91059 100644
> >>>>>> --- a/drivers/media/v4l2-core/v4l2-ctrls-core.c
> >>>>>> +++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c
> >>>>>> @@ -1168,6 +1168,8 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> >>>>>> if (!area->width || !area->height)
> >>>>>> return -EINVAL;
> >>>>>> break;
> >>>>>> + case V4L2_CTRL_TYPE_FIXED_POINT:
> >>>>>> + break;
> >>>>>
> >>>>> Hmm, this would need this patch 'v4l2-ctrls: add support for V4L2_CTRL_WHICH_MIN/MAX_VAL':
> >>>>>
> >>>>> https://patchwork.linuxtv.org/project/linux-media/patch/20231010022136.1504015-7-yunkec@google.com/
> >>>>>
> >>>>> since min and max values are perfectly fine for a fixed point value.
> >>>>>
> >>>>> Even a step value (currently not supported in that patch) would make sense.
> >>>>>
> >>>>> But I wonder if we couldn't simplify this: instead of creating a v4l2_ctrl_fixed_point,
> >>>>> why not represent the fixed point value as a Q31.32. Then the standard
> >>>>> minimum/maximum/step values can be used, and it acts like a regular V4L2_TYPE_INTEGER64.
> >>>>>
> >>>>> Except that both userspace and drivers need to multiply it with 2^-32 to get the actual
> >>>>> value.
> >>>>>
> >>>>> So in enum v4l2_ctrl_type add:
> >>>>>
> >>>>> V4L2_CTRL_TYPE_FIXED_POINT = 10,
> >>>>>
> >>>>> (10, because it is no longer a compound type).
> >>>>
> >>>> Seems we don't need V4L2_CTRL_TYPE_FIXED_POINT, just use V4L2_TYPE_INTEGER64?
> >>>>
> >>>> The reason I use the 'integer' and 'fractional' is that I want
> >>>> 'integer' to be the normal sample
> >>>> rate, for example 48kHz. The 'fractional' is the difference with
> >>>> normal sample rate.
> >>>>
> >>>> For example, the rate = 47998.12345. so integer = 48000, fractional= -1.87655.
> >>>>
> >>>> So if we use s64 for rate, then in driver need to convert the rate to
> >>>> the closed normal
> >>>> sample rate + fractional.
> >>>
> >>> That wasn't what the documentation said :-)
> >>>
> >>> So this is really two controls: one for the 'normal sample rate' (whatever 'normal'
> >>> means in this context) and the offset to the actual sample rate.
> >>>
> >>> Presumably the 'normal' sample rate is set once, while the offset changes
> >>> regularly.
> >>>
> >>> But why do you need the 'normal' sample rate? With audio resampling I assume
> >>> you resample from one rate to another, so why do you need a third 'normal'
> >>> rate?
> >>>
> >>
> >> 'Normal' rate is used to select the prefilter table.
> >>
> >
> > Currently I think we may define
> > V4L2_CID_M2M_AUDIO_SOURCE_RATE
> > V4L2_CID_M2M_AUDIO_DEST_RATE
>
> That makes sense.
>
> > V4L2_CID_M2M_AUDIO_ASRC_RATIO_MOD
>
> OK, can you document this control? Just write it down in the reply, I just want
> to understand how the integer value you set here is used.
>
It is Q31 value. It is equal to:
in_rate_new / out_rate_new - in_rate_old / out_rate_old
Best regards
Wang shengjiu
> Regards,
>
> Hans
>
> >
> > All of them can be V4L2_CTRL_TYPE_INTEGER.
> >
> > RATIO_MOD was defined in the very beginning version.
> > I think it is better to let users calculate this value.
> >
> > The reason is:
> > if we define the offset for source rate and dest rate in
> > driver separately, when offset of source rate is set,
> > driver don't know if it needs to wait or not the dest rate
> > offset, then go to calculate the ratio_mod.
> >
> > best regards
> > wang shengjiu
> >
> >> Best regards
> >> Wang Shengjiu
> >>
> >>> Regards,
> >>>
> >>> Hans
> >>>
> >>>>
> >>>> best regards
> >>>> wang shengjiu
> >>>>
> >>>>>
> >>>>>>
> >>>>>> default:
> >>>>>> return -EINVAL;
> >>>>>> @@ -1868,6 +1870,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
> >>>>>> case V4L2_CTRL_TYPE_AREA:
> >>>>>> elem_size = sizeof(struct v4l2_area);
> >>>>>> break;
> >>>>>> + case V4L2_CTRL_TYPE_FIXED_POINT:
> >>>>>> + elem_size = sizeof(struct v4l2_ctrl_fixed_point);
> >>>>>> + break;
> >>>>>> default:
> >>>>>> if (type < V4L2_CTRL_COMPOUND_TYPES)
> >>>>>> elem_size = sizeof(s32);
> >>>>>> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> >>>>>> index 8696eb1cdd61..d8f232df6b6a 100644
> >>>>>> --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> >>>>>> +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> >>>>>> @@ -1602,6 +1602,10 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
> >>>>>> case V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY:
> >>>>>> *type = V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY;
> >>>>>> break;
> >>>>>> + case V4L2_CID_ASRC_SOURCE_RATE:
> >>>>>> + case V4L2_CID_ASRC_DEST_RATE:
> >>>>>> + *type = V4L2_CTRL_TYPE_FIXED_POINT;
> >>>>>> + break;
> >>>>>> default:
> >>>>>> *type = V4L2_CTRL_TYPE_INTEGER;
> >>>>>> break;
> >>>>>> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> >>>>>> index 59679a42b3e7..645e4cccafc7 100644
> >>>>>> --- a/include/media/v4l2-ctrls.h
> >>>>>> +++ b/include/media/v4l2-ctrls.h
> >>>>>> @@ -56,6 +56,7 @@ struct video_device;
> >>>>>> * @p_av1_tile_group_entry: Pointer to an AV1 tile group entry structure.
> >>>>>> * @p_av1_frame: Pointer to an AV1 frame structure.
> >>>>>> * @p_av1_film_grain: Pointer to an AV1 film grain structure.
> >>>>>> + * @p_fixed_point: Pointer to a struct v4l2_ctrl_fixed_point.
> >>>>>> * @p: Pointer to a compound value.
> >>>>>> * @p_const: Pointer to a constant compound value.
> >>>>>> */
> >>>>>> @@ -89,6 +90,7 @@ union v4l2_ctrl_ptr {
> >>>>>> struct v4l2_ctrl_av1_tile_group_entry *p_av1_tile_group_entry;
> >>>>>> struct v4l2_ctrl_av1_frame *p_av1_frame;
> >>>>>> struct v4l2_ctrl_av1_film_grain *p_av1_film_grain;
> >>>>>> + struct v4l2_ctrl_fixed_point *p_fixed_point;
> >>>>>> void *p;
> >>>>>> const void *p_const;
> >>>>>> };
> >>>>>> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> >>>>>> index c3604a0a3e30..91096259e3ea 100644
> >>>>>> --- a/include/uapi/linux/v4l2-controls.h
> >>>>>> +++ b/include/uapi/linux/v4l2-controls.h
> >>>>>> @@ -112,6 +112,8 @@ enum v4l2_colorfx {
> >>>>>>
> >>>>>> /* last CID + 1 */
> >>>>>> #define V4L2_CID_LASTP1 (V4L2_CID_BASE+44)
> >>>>>> +#define V4L2_CID_ASRC_SOURCE_RATE (V4L2_CID_BASE + 45)
> >>>>>> +#define V4L2_CID_ASRC_DEST_RATE (V4L2_CID_BASE + 46)
> >>>>>
> >>>>> This patch needs to be split in three parts:
> >>>>>
> >>>>> 1) Add the new M2M_AUDIO control class,
> >>>>> 2) Add the new V4L2_CTRL_TYPE_FIXED_POINT type,
> >>>>> 3) Add the new controls.
> >>>>>
> >>>>> These are all independent changes, so separating them makes it easier to
> >>>>> review.
> >>>>>
> >>>>>>
> >>>>>> /* USER-class private control IDs */
> >>>>>>
> >>>>>> @@ -3488,4 +3490,15 @@ struct v4l2_ctrl_av1_film_grain {
> >>>>>> #define V4L2_CID_MPEG_MFC51_BASE V4L2_CID_CODEC_MFC51_BASE
> >>>>>> #endif
> >>>>>>
> >>>>>> +/**
> >>>>>> + * struct v4l2_ctrl_fixed_point - fixed point parameter.
> >>>>>> + *
> >>>>>> + * @rate_integer: integer part of fixed point value.
> >>>>>> + * @rate_fractional: fractional part of fixed point value
> >>>>>> + */
> >>>>>> +struct v4l2_ctrl_fixed_point {
> >>>>>> + __u32 integer;
> >>>>>
> >>>>> __s32?
> >>>>>
> >>>>>> + __u32 fractional;
> >>>>>> +};
> >>>>>> +
> >>>>>> #endif
> >>>>>> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> >>>>>> index 2ac7b989394c..3ef32c09c2fa 100644
> >>>>>> --- a/include/uapi/linux/videodev2.h
> >>>>>> +++ b/include/uapi/linux/videodev2.h
> >>>>>> @@ -1888,6 +1888,7 @@ struct v4l2_ext_control {
> >>>>>> struct v4l2_ctrl_av1_tile_group_entry __user *p_av1_tile_group_entry;
> >>>>>> struct v4l2_ctrl_av1_frame __user *p_av1_frame;
> >>>>>> struct v4l2_ctrl_av1_film_grain __user *p_av1_film_grain;
> >>>>>> + struct v4l2_ctrl_fixed_point __user *p_fixed_point;
> >>>>>> void __user *ptr;
> >>>>>> };
> >>>>>> } __attribute__ ((packed));
> >>>>>> @@ -1966,6 +1967,8 @@ enum v4l2_ctrl_type {
> >>>>>> V4L2_CTRL_TYPE_AV1_TILE_GROUP_ENTRY = 0x281,
> >>>>>> V4L2_CTRL_TYPE_AV1_FRAME = 0x282,
> >>>>>> V4L2_CTRL_TYPE_AV1_FILM_GRAIN = 0x283,
> >>>>>> +
> >>>>>> + V4L2_CTRL_TYPE_FIXED_POINT = 0x290,
> >>>>>> };
> >>>>>>
> >>>>>> /* Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
> >>>>>
> >>>>> Regards,
> >>>>>
> >>>>> Hans
> >>>
>
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