linux-kernel - Re: [PATCH 1/9] drm: bridge/dw_hdmi-ahb-audio: add audio driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150810181641.GD10748@sirena.org.uk>
Date:	Mon, 10 Aug 2015 19:16:41 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Takashi Iwai <tiwai@...e.de>, linux-rockchip@...ts.infradead.org,
	alsa-devel@...a-project.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Andy Yan <andy.yan@...k-chips.com>,
	Yakir Yang <ykk@...k-chips.com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Jon Nettleton <jon.nettleton@...il.com>,
	David Airlie <airlied@...ux.ie>
Subject: Re: [PATCH 1/9] drm: bridge/dw_hdmi-ahb-audio: add audio driver

On Mon, Aug 10, 2015 at 05:49:41PM +0100, Russell King - ARM Linux wrote:

> I'm not sure what the right solution is here: modifying every audio
> player out there to make HDMI work sanely is crazy.  Having alsalib
> automatically generate the correct AES channel status bytes for
> linear audio formats seems to be sensible, but difficult given its
> present structure with the defaults - the iec958 plugin has no idea
> if the defaults are being used or not.

> The advantage of having the horrid conversion in the kernel is that
> we can choose to generate proper AES channel status data without
> regard to userspace for standard linear PCM, and when the iec958 plugin
> is being used with proper channel status (eg, in compressed audio
> pass-through mode by VLC) then that works too.

The other advantage of doing it in kernel is that it also fixes tinyalsa
applications (which mainly means Android systems) by default for PCM
data.

Download attachment "signature.asc" of type "application/pgp-signature" (474 bytes)