[alsa-devel] ALSA patch Nvidia 8 channel hdmi audio

[Wei Ni]

Hi, Alan

I reproduced this problems with speaker-test. The channels are wrong
mapped.

It's strange that if use mplayer to run, it looks ok.

I'm looking this problems, and try to find the root cause.

 

Thanks

 

From: Alan Alan [mailto:alanwww1 at gmail.com] 
Sent: Wednesday, June 03, 2009 4:00 PM
To: Wei Ni
Cc: Marek Vasut; alsa-devel at alsa-project.org; Peer Chen
Subject: Re: ALSA patch Nvidia 8 channel hdmi audio

 

Hello Wei !

Thanks for replying.
I tested it with speaker-test and xbmc babylon. Both had problems with
channel mapping.
I used this command:

speaker-test -Dhdmi -c6
or
speaker-test -Dhdmi -c8

alternatively you could try 

speaker-test -Dhw:0,3 -c6


I had to rund Xorg first and have the command from an xterm, becasue
from a normal terminal it would not work.
I think that is normal as a limitation of hdmi.

What about the support for 24bits 192khz sound ?

speaker-test -Dhdmi -c6  -r192000 does not work.

Thanks for working on this.





2009/6/3 Wei Ni <wni at nvidia.com>

Hi, Marek and Alan
I'm a Nvidia engineer and develop this patch file.

I used mplayer to test. The channels are mapped good.
Running mplayer -ao alsa:device=hw=0.3 6ch.wav

I tried to use speaker-test to test, but I can't get the hdmi device
name.
I used speaker-test -Dsurround51:NVidia -c6, the sound output from the
analog jack.
Which device name should I use?

I use aplay -l, it show
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: ALC1200 Analog [ALC1200 Analog]
 Subdevices: 1/1
 Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 1: ALC1200 Digital [ALC1200 Digital]
 Subdevices: 1/1
 Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 3: NVIDIA HDMI [NVIDIA HDMI]
 Subdevices: 1/1
 Subdevice #0: subdevice #0

Thanks
Wei.


-----Original Message-----
From: Marek Vasut [mailto:marek.vasut at gmail.com]
Sent: Wednesday, June 03, 2009 8:01 AM
To: Alan Alan
Cc: alsa-devel at alsa-project.org; Wei Ni
Subject: Re: ALSA patch Nvidia 8 channel hdmi audio

On Wednesday 03 of June 2009 00:30:04 Alan Alan wrote:
> Thank's for the info.
> How can i contact him ?

He and alsa-devel mailing list are both in CC already, please preserve
them
there or fix your mailer.
>
>
> 2009/6/3 Marek Vasut <marek.vasut at gmail.com>
>
> > I'm not the author of the patch, CCing alsa-devel and the original
> > author.
> >
> > On Tuesday 02 of June 2009 23:58:26 Alan Alan wrote:
> > > Hi Marek !
> > >
> > > I just read your emailing with nvidia devs about alsa supporting 8
> >
> > channel
> >
> > > lpcm over hdmi.
> > >
> > > I checked it out an i have to tell it is working awsome, except
for a
> > > few bugs:
> > >
> > > The channels are wrong mapped. Running a speakertest -Dhdmi -c6
gives
> > > the following result (first where it should sound)
> > > FL - FL
> > > C - RL
> > > FR - FR
> > > RR - LFE
> > > RL - C
> > >
> > > The other thing i realized that playback is limited to 16 bits 48
khz.
> > > I think the minimum which is supported by nvidia hardware is
24bits 96
> > > (or 192) khz.
> > > Why not ?
> > >
> > > Could you contact the devs as i don't know how to reach them.
> > >
> > > ps.: Mybe my build methot was not 100% ok ? I used 1.020 Alsa with
the
> > > oatched nvidia.c file. Anyway the amplifier shows multichannel
LPCM and
> > > that's great news.




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