On Thu, Sep 09, 2021 at 05:06:17PM -0400, Programmingkid wrote: > Hi Gerd, > > Howard and I were talking about USB audio problems with Mac OS guests. We > think the issue might be with frames being sent to the USB audio card too > soon. My guess is only one frame is suppose to be transmitted every 1 > millisecond. I was also reading the todo notes in the file hw/hcd-ohci.c. > This is what it says: > > * TODO: > * o Isochronous transfers > * o Allocate bandwidth in frames properly > * o Disable timers when nothing needs to be done, or remove timer usage > * all together. > * o BIOS work to boot from USB storage > */ > > Do you think implementing isochronous transfers would fix the audio problems > Mac OS guest are experiencing?
Most likely yes, audio devices typically use iso endpints. take care, Gerd
