linux-kernel - Re: [PATCH 0/2] ALSA: hda - support HDMI HBR passthrough

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Message-ID: <s5h1vaglzxt.wl%tiwai@suse.de>
Date:	Tue, 03 Aug 2010 13:04:46 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Anssi Hannula <anssi.hannula@....fi>
Cc:	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] ALSA: hda - support HDMI HBR passthrough

At Tue, 3 Aug 2010 14:04:01 +0300,
Anssi Hannula wrote:
> 
> Takashi Iwai kirjoitti tiistai, 3. elokuuta 2010 13:59:09:
> > At Tue,  3 Aug 2010 13:28:56 +0300,
> > 
> > Anssi Hannula wrote:
> > > Hi all!
> > > 
> > > This patchset adds support for passing through IEC 61937 encapsulated
> > > compressed audio at high bitrates (i.e. those over 6.144Mbps).
> > > At least TrueHD and DTS-HD are such formats.
> > > 
> > > I've tested this using an NVIDIA hdmi codec and the following ffmpeg
> > > patch which adds support for TrueHD in its IEC 61937 muxer:
> > > http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2010-August/094317.html
> > > 
> > > One needs to set the AES0 & 0x02 (non-audio) bit during playback so that
> > > the data is not transmitted as normal 8 channel PCM audio.
> > 
> > Thanks, I applied both patches.
> > 
> > There are some magic numbers there like 0x8000, and I'm going to define
> > them...
> 
> Yeah, I guess all the Stream Format bits should be defined to get rid of all 
> the existing magic numbers in snd_hda_calc_stream_format() as well.

Exactly.


Takashi
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