Philippe Mathieu-Daudé <f4...@amsat.org> writes: > On 4/29/21 3:46 PM, Gerd Hoffmann wrote: > >> Hmm. Not so easy I suspect. While most sound cards map to a single >> device there are exceptions. pcspk is build-in and hda is two devices. > > What do you mean by "pcspk is build-in"? > > Do you mean "the 'pcspk' audiodev is build in the 8254 PIT device"? > (see pcspk_audio_init).
I think so. The 8254 is an onboard device, i.e. it's always there. In real PC hardware, one of its timers is wired to a speaker. In our virtual hardware, we have separate "isa-pit" (or "kvm-pit) and "isa-pcspk" devices, where the latter connects to the former via link property "pit", and may be connected to an audio backend, but isn't by default. To connect to one, use -machine pcspk-audiodev=... > FWIW I'm using this device as example to work on the PWM API, > and I see the AUD API as a generic DSP processing one. > And in my TODO I have "split pcspk audiodev backend from 8254". Not sure I understand your TODO, but then I don't have to :)
