On Fri, Sep 10, 2021 at 9:23 PM Programmingkid <programmingk...@gmail.com> wrote:
> > > > On Sep 10, 2021, at 7:51 AM, BALATON Zoltan <bala...@eik.bme.hu> wrote: > > > > On Fri, 10 Sep 2021, Howard Spoelstra wrote: > >> On Fri, Sep 10, 2021 at 7:07 AM Gerd Hoffmann <kra...@redhat.com> > wrote: > >> > >>> 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 > >>> > >> > >> Hi, > >> > >> Below I pasted the first lines mentioning isochronous traffic from a > pcap > >> file when running fedora12 with the usb-audio device and the first lines > >> from a pcap file running Mac OS 9.2 with the usb-audio device > >> > >> Fedora: > >> 91 56.715001 host 0.5.1 USB 256 URB_ISOCHRONOUS out > >> 92 56.715018 0.5.1 host USB 64 URB_ISOCHRONOUS out > >> > >> MacOS: > >> 143 56.031989 host 0.16.1 USB 256 URB_ISOCHRONOUS out > >> 144 56.032026 0.16.1 host USB 64 URB_ISOCHRONOUS out > >> > >> The usb-audio device works for the fedora guest, so would this not > indicate > >> that the iso endpoints are already working? > >> > >> The usb-audio device also work (for a limited amount of time) when > running > >> MacOS. Looking at USB logging in the Mac OS guest, to me it seems the > MacOS > >> side runs into timing issues when packages drift too far apart. It then > >> finally gives up trying to keep the stream open. > > > > I was also trying to find why the usb-audio device does not work with > MorphOS but I could not figure it out. Now I have two machines (mac99 and > pegasos2) that can boot MorphOS but usb-audio does not work with either so > maybe it's not because of the USB controller. I've found there is a debug > property that enables some logging: -device usb-audio,debug=1 but that did > not reveal much more. It looks like MorphOS tries to query the device but > replies come very slow (not sure if that's normal or a problem) then just > gives up after a while. Maybe you can try comparing what Fedora and other > OSes query as it may be we're missing some info in USB descriptors that > other drivers than Linux's rely on but that's just a guess I haven't tested > with Linux guest on pegasos2 or mac99 yet. > > > > Regards, > > BALATON Zoltan > > Thank for the info everyone. When I try to use the USB-Audio device in Mac > OS 10.4.11, the operating system doesn't use it. It does show up in the > System Profiler application. In Mac OS 9.2 the sound from it is perfect > sounding, but the operating system crashes after less than a minute. In Mac > OS 10.2.3 the operating system does set it as its output device but it does > not work. > > To find out what is wrong we would probably have to build the USB audio > drivers in Mac OS X and enable debug output to see what is wrong. They are > open source and I have done this in the past. As for Mac OS 9, I'm not sure > how to debug its driver. See the screen shot attached for the warnings about timing in MacOS 9.2 before the stream collapses.This was after some system sounds were played successfully. [image: usb-audiolog.png] Best, Howard
