Re: MIDI driver stops audio
Re: MIDI driver stops audio
- Subject: Re: MIDI driver stops audio
- From: Nick <email@hidden>
- Date: Tue, 16 May 2006 10:15:03 +0100
We've found the same problem too.
USBDevice::OpenAndConfigure(...) performs a SetConfiguration() on the
device, which effectively causes it to disappear and then reappear on
the bus (and correspondingly the audio driver gets torn down and
started again).
I'm not sure why this code assumes it needs to set the configuration,
shouldn't IOUSBCompositeDriver's handling of this be enough?
Nick
On 12 May 2006, at 20:56, Jeff Moore wrote:
It totally depends on what's going on. The description of the
problem lacks some details. For instance:
What modifications did you make to the driver?
Does this happen without your modifications?
What USB hardware are you using (presumably the hw you've been
asking driver questions for)?
What apps are you testing with?
Do all apps show the problem or just some of them?
When the problem happens, what does the telemetry look like in
HALLab? Does it show any issues?
It's really hard to give you advice without knowing a bit more
about what's going on.
On May 12, 2006, at 12:41 PM, david tay wrote:
When using the SampleUSBMidi driver (with the necessary
modifications), I've noticed that my USB audio device stops audio
output.
The driver appears to be sending out data to the device just fine.
When the SampleUSBMidi driver is not loaded, audio plays.
Are there any tips for resolving this?
--
Jeff Moore
Core Audio
Apple
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