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

[Alan Alan]

Hello Wei !

If you used mplayer with this command,

"mplayer -ao alsa:device=hw=0.3 6ch.wav"

than i think it might be that the test fiile is faulty. Why not try this
test file with a dts stream saying the channles after each other:

http://rapidshare.com/files/240315685/xbmc_dts_test.mkv

I also tried xbmc media center which "treats" the hdmi device as a
multichannel analog device and there i found the same mapping problem.

Thanks


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

>  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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