linux-kernel - Re: [RFC PATCH v4 09/11] media: uapi: Add V4L2_CID_USER_IMX_ASRC_RATIO

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Message-ID: <f5743550-89a1-48b4-a8a6-f66fd246a02c@sirena.org.uk>
Date:   Thu, 21 Sep 2023 12:45:52 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Shengjiu Wang <shengjiu.wang@...il.com>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        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,
        Xiubo.Lee@...il.com, festevam@...il.com, nicoleotsuka@...il.com,
        lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH v4 09/11] media: uapi: Add
 V4L2_CID_USER_IMX_ASRC_RATIO_MOD control

On Thu, Sep 21, 2023 at 07:13:14PM +0800, Shengjiu Wang wrote:

> Ratio modification on i.MX is to modify the configured ratio.
> For example, the input rate is 44.1kHz,  output rate is 48kHz,
> configured ratio = 441/480,   the ratio modification is to modify
> the fractional part of (441/480) with small steps.  because the
> input clock or output clock has drift in the real hardware.
> The ratio modification is signed value, it is added to configured
> ratio.

It does sound like something other vendors are likely to have to provide
a mechanism to compensate for clock inaccuracies.

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