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| author | Miguel GAIO <mgaio35@gmail.com> | 2018-09-27 17:19:36 +0200 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2018-10-01 10:49:54 +0200 |
| commit | a60f39a4681b369bdcc78a9d1a1067d4a6bb8736 (patch) | |
| tree | 6b5682cf2243b07b602c7fbd0322da274e06a9de /qemu-doc.texi | |
| parent | 3e9191acb797e4298adb853bf6c75cd31af47ef9 (diff) | |
ohci: set effectively usb frame rate to 1kHz
USB frame rate is slightly lower than 1kHz: ie. ~950Hz.
Thus usb-audio device is not able to perform a simple audio playback
without underruns on audio backend.
eg. "-device pci-ohci,id=ohci -device usb-audio,bus=ohci.0" vs PulseAudio
backend. more than 50 underruns are observed per second.
Update ohci_sof_time computation, using QEMU_CLOCK_VIRTUAL in
ohci_usb_start(), and increment by usb_frame_time in ohci_sof()
makes USB frame rate close to 1kHz.
This way, no audio underrun are observed during audio playback.
Signed-off-by: Miguel GAIO <mgaio35@gmail.com>
Message-Id: <20180927151936.3647-1-mgaio35@gmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'qemu-doc.texi')
0 files changed, 0 insertions, 0 deletions