linux-kernel - Re: [PATCH 1/6] media: v4l2: Add audio capture and output support

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Message-ID: <090cc065-b078-4f2c-9b2d-3b0b7418461d@sirena.org.uk>
Date:   Mon, 3 Jul 2023 18:58:55 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     Takashi Iwai <tiwai@...e.de>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Sakari Ailus <sakari.ailus@....fi>,
        Shengjiu Wang <shengjiu.wang@....com>, 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,
        Jacopo Mondi <jacopo@...ndi.org>
Subject: Re: [PATCH 1/6] media: v4l2: Add audio capture and output support

On Mon, Jul 03, 2023 at 03:12:55PM +0200, Hans Verkuil wrote:

> My main concern is that these cross-subsystem drivers are a pain to
> maintain. So there have to be good reasons to do this.

> Also it is kind of weird to have to use the V4L2 API in userspace to
> deal with a specific audio conversion. Quite unexpected.

> But in the end, that's a decision I can't make.

> So I wait for that feedback. Note that if the decision is made that this
> can use V4L2, then there is quite a lot more that needs to be done:
> documentation, new compliance tests, etc. It's adding a new API, and that
> comes with additional work...

Absolutely, I agree with all of this - my impression was that the target
here would be bypass of audio streams to/from a v4l2 device, without
bouncing through an application layer.  If it's purely for audio usage
with no other tie to v4l2 then involving v4l2 does just seem like
complication.

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