[alsa-devel] ALSA patch Nvidia 8 channel hdmi audio
Takashi Iwai
tiwai at suse.de
Sat Jun 6 11:13:43 CEST 2009
At Fri, 5 Jun 2009 01:20:52 +0200,
Alan Alan wrote:
>
> I made a test on Windows. And it seems that my codec MCP7A does support up
> to 8channels 192khz, 24bits no problem.
>
> One important thing i noticed:
> If i plug the hdmi to the lcd TV, the windows control panel only shows up
> to 2ch, 48khz. When i plug it into the Onkyo-TXSR605 av receiver and reboot,
> only than it shows up the HD options.
>
> I enclosed a screenshout about it. When i press test button, the audio
> sounds in the receiver even with 192/24
>
> Strange thing here that on win, it does not even show the 88.2khz number.
> And sample rates depend on what device is plugged, but on alsa i always get
> the same output (48, 88.2khz) whatever device i plug on.
As Wei pointed, currently the video driver doesn't send the correct
CEA register setup, thus the supported sample rates aren't updated.
(HDMI is a thing that is always coupled with the video. That's why it
works only when you start X.)
Maybe the easiest workaround is to give all possible values statically
independent on the plugging state. Try to write other bits in
addition to 48k and 16bit format.
BTW, what happens if you plug HDMI before boot and loading the driver?
Takashi
>
>
>
> 2009/6/4 Takashi Iwai <tiwai at suse.de>
>
> > At Thu, 4 Jun 2009 08:18:23 +0200,
> > Alan Alan wrote:
> > >
> > > 2009/6/4 Takashi Iwai <tiwai at suse.de>
> > >
> > > At Thu, 4 Jun 2009 01:28:24 +0200,
> > > Alan Alan wrote:
> > > >
> > > > Hello Takashi !
> > > >
> > > > I tried to apply the patch that removes restrictions to 16bits
> > 48khz
> > > format.
> > > > Well now we have the following:
> > > > 16bit 48khz works
> > > > 32bit 48khz works
> > > > 32bit 44khz, 96khz, 192khz don't work
> > > > 24bit 44khz, 48khz, 96khz, 192khz don't work
> > > > 16bit 44khz, 96khz, 192khz don't work
> > > >
> > > > I only get
> > > > Sample format not available for playback:
> > > > Setting of hwparams failed:
> > >
> > > As you can find in alsa-info output, it seems that the codec supports
> > > only 48kHz and 88.2kHz, strangely. I don't know whether it's a
> > > (hardware) bug or not.
> > >
> > > The codec surely supports up to 192khz as it works on Windows.
> > >
> > > I think this line is completely wrong as here it says:
> >
> > It is not "wrong". These are values that the codec reports, so it's
> > more or less correct as the h/w information.
> >
> > > rates [0xc0]: 48000 88200
> >
> > Wei, is it right? Or is anything missing here?
> >
> >
> > > bits [0xf]: 8 16 20 24
> > >
> > > 8, 20, 24bits are supported, but they all give an error message.
> >
> > 24bit here means 24bit in 4 bytes, thus it's essentially 32bit format.
> > 24bit in 3 bytes format isn't supported on HD-audio.
> >
> > > 32 bits are not supposed to be supported but it works with 48 and
> > 88.2khz.
> > >
> > > How can we change the software side to accept 96 or 192khz spample
> > formats and
> > > 24 bits ?
> >
> > As long as the codec reports so, it's no "software" problem.
> >
> > > I think it is not hardware limited and we just need to change the allowed
> > > formats to be played.
> >
> > If it's just a hardware problem that reports wrong values, you can
> > override the information, simply replacing the bits my patch disabled
> > to the right values.
> >
> >
> > Takashi
> >
> > >
> > > >
> > > > I enclosed to pastebin my alsainfo script output.
> > > >
> > > > http://pastebin.com/m77dcfb3f
> > > >
> > > > Thanks for the help !
> > > >
> > > > 2009/6/3 Takashi Iwai <tiwai at suse.de>
> > > >
> > > > At Wed, 3 Jun 2009 11:34:00 +0200,
> > > > Alan Alan wrote:
> > > > >
> > > > > Hello Takashi !
> > > > >
> > > > > What should this patch do ?
> > > >
> > > > The patch removes the restriction patch_nvhdmi.c sets.
> > Instead,
> > > > the driver tries to detect the supported format, rate, etc from
> > the
> > > > codec widget information.
> > > >
> > > > > Is it a cure for the 96, 192khz or 24bit sample playback
> > problem ?
> > > >
> > > > Possibly.
> > > >
> > > > > If so, will it resample or natievly pass the stream to the
> > > amplifier ?
> > > >
> > > > It just enables the native support, possibly.
> > > >
> > > > And, don't forget to give back the alsa-info.sh output (run
> > with
> > > > --no-upload option).
> > > >
> > > > Takashi
> > > >
> > > > >
> > > > > Thank you
> > > > >
> > > > > Alan
> > > > >
> > > > > 2009/6/3 Takashi Iwai <tiwai at suse.de>
> > > > >
> > > > > At Wed, 3 Jun 2009 10:00:24 +0200,
> > > > > Alan Alan wrote:
> > > > > >
> > > > > > 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.
> > > > >
> > > > > How about the patch below?
> > > > >
> > > > > Also, could you give alsa-info.sh output?
> > > > >
> > > > > Takashi
> > > > >
> > > > > ---
> > > > > diff --git a/sound/pci/hda/patch_nvhdmi.c
> > b/sound/pci/hda/
> > > > patch_nvhdmi.c
> > > > > index f5792e2..48443de 100644
> > > > > --- a/sound/pci/hda/patch_nvhdmi.c
> > > > > +++ b/sound/pci/hda/patch_nvhdmi.c
> > > > > @@ -258,9 +258,11 @@ static struct hda_pcm_stream
> > > > > nvhdmi_pcm_digital_playback_8ch = {
> > > > > .channels_min = 2,
> > > > > .channels_max = 8,
> > > > > .nid = Nv_Master_Convert_nid,
> > > > > +#if 0
> > > > > .rates = SNDRV_PCM_RATE_48000,
> > > > > .maxbps = 16,
> > > > > .formats = SNDRV_PCM_FMTBIT_S16_LE,
> > > > > +#endif
> > > > > .ops = {
> > > > > .open = nvhdmi_dig_playback_pcm_open,
> > > > > .close =
> > nvhdmi_dig_playback_pcm_close_8ch,
> > > > > @@ -273,9 +275,11 @@ static struct hda_pcm_stream
> > > > > nvhdmi_pcm_digital_playback_2ch = {
> > > > > .channels_min = 2,
> > > > > .channels_max = 2,
> > > > > .nid = Nv_Master_Convert_nid,
> > > > > +#if 0
> > > > > .rates = SNDRV_PCM_RATE_48000,
> > > > > .maxbps = 16,
> > > > > .formats = SNDRV_PCM_FMTBIT_S16_LE,
> > > > > +#endif
> > > > > .ops = {
> > > > > .open = nvhdmi_dig_playback_pcm_open,
> > > > > .close =
> > nvhdmi_dig_playback_pcm_close_2ch,
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
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