linux-kernel - Re: HDMI Audio Support in ALSA

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Date:	Mon, 26 May 2008 12:56:42 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Clemens Ladisch <clemens@...isch.de>
Cc:	Kallol Biswas <nucleodyne@...il.com>,
	Lee Revell <rlrevell@...-job.com>,
	linux-kernel@...r.kernel.org, Xiaogeng Jin <xiaogeng.jin@...oo.com>
Subject: Re: HDMI Audio Support in ALSA

At Mon, 26 May 2008 09:16:15 +0200,
Clemens Ladisch wrote:
> 
> Kallol Biswas wrote:
> > The routine snd_hda_calc_stream_format() calls snd_pcm_format_width()
> > to find if the format is supported and the width.
> >
> > The array holds pcm_format[] holds all the supported formats. However,
> > in this array
> > there is no entry for IEC 60958 or IEC 61937.
> 
> There is.  I already told you that these formats use
> SNDRV_PCM_FORMAT_S16_LE.

Yes.  The apps usually sends the raw data as S16_LE to the driver.
In addition, we have status bits controls.  These are stored into a
control element, and thus independently handled from the raw data.

With SNDRV_PCM_FORMAT_IEC958_SUBFRAME format, both the raw and the
status bits are composed together.  But, which format is supported
depends purely on the driver.


Takashi
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