linux-kernel - Re: HDMI Audio Support in ALSA

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Date:	Thu, 22 May 2008 14:36:13 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Kallol Biswas <nucleodyne@...il.com>
CC:	Lee Revell <rlrevell@...-job.com>, linux-kernel@...r.kernel.org
Subject: Re: HDMI Audio Support in ALSA

(please don't top-post!)

Kallol Biswas wrote:
> I am looking at 2.6.25.4 kernel source code. The header file pcm.h
> does not have any definition for supporting IEC 60958 or IEC 61937 frame types.

Almost all S/PDIF transmitters/receivers use SNDRV_PCM_FORMAT_S16.
(Some use S32 for 24-bit samples, but this doesn't matter for
IEC 60958/61937.)

> However, SNDRV_PCM_FMTBIT_IEC958_SUBFRAME is supported.

This is only for some early revisions of the CMI8738 chip which require
software to generate the preamble/channel status/subcode/parity bits
for each subframe.


Regards,
Clemens
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