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From: Programmingkid <programmingkidx@gmail.com>
To: Gerd Hoffmann <kraxel@redhat.com>,
	QEMU Developers <qemu-devel@nongnu.org>
Cc: Howard Spoelstra <hsp.cat7@gmail.com>
Subject: Implementing isochronous transfers in hw/hcd-ohci.c
Date: Thu, 9 Sep 2021 17:06:17 -0400	[thread overview]
Message-ID: <263FF66A-21D7-4D0D-BE37-2D44B484A1EE@gmail.com> (raw)

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?

             reply	other threads:[~2021-09-09 21:07 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-09 21:06 Programmingkid [this message]
2021-09-10  5:07 ` Implementing isochronous transfers in hw/hcd-ohci.c Gerd Hoffmann
2021-09-10  6:12   ` Howard Spoelstra
2021-09-10  7:51     ` Gerd Hoffmann
2021-09-10 11:51     ` BALATON Zoltan
2021-09-10 19:23       ` Programmingkid
2021-09-11  9:46         ` Howard Spoelstra
2021-09-11 15:10           ` Programmingkid

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