* HDMI with more than 2ch ?
@ 2011-01-24 9:16 Xavier Bestel
2011-01-24 9:22 ` Xavier Bestel
2011-01-25 1:17 ` David Henningsson
0 siblings, 2 replies; 4+ messages in thread
From: Xavier Bestel @ 2011-01-24 9:16 UTC (permalink / raw)
To: alsa-devel
Hi,
I'm using HDMI output on an HD 2600, using KMS from kernel 2.6.37:
http://www.alsa-project.org/db/?f=b3f67a0890f9878b7b3f345578e24eda0aaa59ac
The problem is that only 2ch are supported (not 1, not 3 or more). I
tested with speaker-test, it only works with -c 2.
So how can I access the other PCM channels ? There are 8 of them
available in the HDMI standard, I thought the card should be able to
drive all of them.
Thanks,
Xav
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: HDMI with more than 2ch ?
2011-01-24 9:16 HDMI with more than 2ch ? Xavier Bestel
@ 2011-01-24 9:22 ` Xavier Bestel
2011-01-25 1:17 ` David Henningsson
1 sibling, 0 replies; 4+ messages in thread
From: Xavier Bestel @ 2011-01-24 9:22 UTC (permalink / raw)
To: alsa-devel
On Mon, 2011-01-24 at 10:16 +0100, Xavier Bestel wrote:
> Hi,
>
> I'm using HDMI output on an HD 2600, using KMS from kernel 2.6.37:
> http://www.alsa-project.org/db/?f=b3f67a0890f9878b7b3f345578e24eda0aaa59ac
> The problem is that only 2ch are supported (not 1, not 3 or more). I
> tested with speaker-test, it only works with -c 2.
Just in case:
[root@awak:~]$ speaker-test -Dhw:1,3 -c6 -twav
speaker-test 1.0.23
Playback device is hw:1,3
Stream parameters are 48000Hz, S16_LE, 6 channels
WAV file(s)
Channels count (6) not available for playbacks: Argument invalide
Setting of hwparams failed: Argument invalide
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: HDMI with more than 2ch ?
2011-01-24 9:16 HDMI with more than 2ch ? Xavier Bestel
2011-01-24 9:22 ` Xavier Bestel
@ 2011-01-25 1:17 ` David Henningsson
2011-01-25 6:47 ` Xavier Bestel
1 sibling, 1 reply; 4+ messages in thread
From: David Henningsson @ 2011-01-25 1:17 UTC (permalink / raw)
To: alsa-devel
On 2011-01-24 10:16, Xavier Bestel wrote:
> Hi,
>
> I'm using HDMI output on an HD 2600, using KMS from kernel 2.6.37:
> http://www.alsa-project.org/db/?f=b3f67a0890f9878b7b3f345578e24eda0aaa59ac
> The problem is that only 2ch are supported (not 1, not 3 or more). I
> tested with speaker-test, it only works with -c 2.
>
> So how can I access the other PCM channels ? There are 8 of them
> available in the HDMI standard, I thought the card should be able to
> drive all of them.
According to your HDMI codec it only supports stereo output, not
8-channel PCM. This is a limitation in your hardware, not in the HDMI
standard.
That is, if you want more channels, you probably want to ac3-encode the
audio data.
--
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2011-01-25 6:47 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2011-01-24 9:16 HDMI with more than 2ch ? Xavier Bestel
2011-01-24 9:22 ` Xavier Bestel
2011-01-25 1:17 ` David Henningsson
2011-01-25 6:47 ` Xavier Bestel
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