[RFC PATCH v4 09/11] media: uapi: Add V4L2_CID_USER_IMX_ASRC_RATIO_MOD control

Mark Brown broonie at kernel.org
Thu Sep 21 21:45:52 AEST 2023

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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