macos 15: Built-in virtual audio entity not showing up

[i-n-g-o]

In Hive using the same library versions a "Got Fatal Enumeration Error" for the virtual audio entity is shown.

The entity is present and seems to be sane in apples "Avb Configuration".

Is anything known about this?

[christophe-calmejane]

Hi,

I did make a report few weeks ago to Apple, for an issue in mac's Avb Entity, but didn't get any response. Not sure it's related but I'll definitely take a look as soon as I've update my mac (don't want to rush though, I've seen a lot of other issues).

[i-n-g-o]

Hello,

Great this is already known.

I ran the Discover tool on a mac with Sequoia installed and attached a dump.
The only connected device is the mac with virtual audio enabled.

Entity with id: 0xc989f3aa09268001 is the one in question. This log may be interesting:

[Error] [0xc989f3aa09268001] Got Fatal Enumeration Error
Query error on entity 0xc989f3aa09268001: 39

Also I see another entity in "AVB Configuration" which is my local mac: name.local and has id: 0x0030931907f00082. It seems not to be a valid entity, traces of it can be found in the dump.

avdecc-discover.txt

hth.

[i-n-g-o]

Query error 39: StreamInputCounters

In fact the entity has not counters on any input or output stream

[christophe-calmejane]

Well it shouldn't cause an enumeration error, I'll need to take a deeper look, but I need to find a mac I can update. Thanks a lot for the report.

[i-n-g-o]

I digged in a bit and found that the response coming from AudioVideoBridging already has a non-zero status:

<AVB17221AECPAEMGetCountersResponse (0x6000002d5500): messageType:0x01 status:0x0a targetEntityID:0xc989f3aa09268001 controllerEntityID:0x0030931907f00001 sequenceID:0x006b commandType:0x0029 commandSpecificData:{length = 136, bytes = 0x00050001 00000000 00000000 00000000 ... 00000000 00000000 } sourceMAC:00:30:93:19:07:f0>

This happens on the "Media Clock Input Stream" which does not have counters information.

This is strange: the clock input stream does not have counter information if the adapter is plugged in freshly. Only after right-click on the entity -> "Change Sampling Rate" and then right-click "Update ... state" the counter information shows up. Also I just see that when the adapter is freshly plugged this stream does not have a "Stream ID" and no "Stream VLAN ID". Both appear after setting the sampling rate.

If the counter-information is present also the avdecc discovery works as expected.
Also it seems it looses this information randomly.

Freshly plugged:

After setting sampling-rate:

[christophe-calmejane]

I stumbled upon this issue myself today, and it's in fact more deep than I expected and requires a Radar to be filled at Apple.
The entity is actually returning ENTITY_MISBEHAVING error code, that's why the library stops enumeration at this point.