Re: [gentoo-user] Oss/Alsa/Pulseaudio: never-ending wars (VBox)

[n952162]

On 2020-02-19 15:37, n952162 wrote:
> On 2020-02-19 10:48, Adam Carter wrote:
>> On Wed, Feb 19, 2020 at 8:06 PM <n952162@×××.de
>> <mailto:n952162@×××.de>> wrote:
>>
>>     I can't play audio from my VBox.  The host system only plays
>>     audio through the second sound card (1).  The VBox offers me OSS
>>     or the null driver.  The Alsa and pulseaudio pages  say OSS is
>>     "deprecated".   Is Oracle out of the picture?  I can't find the
>>     straight dope.
>>
>>     Do I have to convince VBox to talk to a different sound card?
>>
>> Which vbox version and what are your use flags?
>>
>> FWIW, for me;
>> app-emulation/virtualbox-6.1.2::gentoo was built with the following:
>> USE="alsa opengl opus pam pulseaudio qt5 sdk udev -debug -doc -dtrace
>> -headless -java -libressl -lvm -pax_kernel -python -vboxwebsrv -vnc"
>> ABI_X86="(64)" PYTHON_SINGLE_TARGET="python3_6 -python2_7 -python3_7
>> -python3_8" PYTHON_TARGETS="python2_7 python3_6 -python3_7 -python3_8"
>>
>> So i can use ALSA or pulse.
>
>
> Okay, that's a good tip.  I'll try those use flags - I have none set.
>
> I'm at virtualbox-5.2.32, which I just emerged in the last couple of
> days, using this profile:
>
>     [16]  default/linux/amd64/17.1 (stable) *
>

I added alsa and pulseaudio and it didn't help.  Then I noticed that
opus has something to do with the soundcard so I emerged that with -vU
but nothing needed to be done.

It seems like VBox is interfacing directly with "the" sound card and
even working correctly (e.g. aplay some-file takes about the right
amount of time until it ends error-free), but unfortunately, I have 2
sound cards and the first doesn't work.

Perhaps I could map the one to the other soundcard using .asoundrc? 
Unfortunately, I can find no grammar for that file.