Re: usb continuous output frequency format
Re: usb continuous output frequency format
- Subject: Re: usb continuous output frequency format
- From: Jeff Moore <email@hidden>
- Date: Tue, 24 Dec 2002 10:04:26 -0800
The HAL provides the API for discovering and changing the stream format
of your device. The properties kAudioDevicePropertyNominalSampleRate
and kAudioDevicePropertyAvailableNominalSampleRates are apropos here.
The fact that most apps just leave the device set to one sample rate
and do software rate conversion is pretty much common practice. There
isn't anything your device can do to force them to change the format
when they are happy with that arrangement.
On Monday, December 23, 2002, at 03:58 PM, Mark Ketilson wrote:
I have a USB device with an output channel that has continuous
frequency capability. It supports frequencies in a certain range and
returns that range. {4990, 55010} The device is set to 44.1 kHz as the
default.
The problem I'm having is that no audio program changes the frequency
of my device when I play files of a frequency other than 44.1kHz. I'm
wondering if there is a suggested method to add this functionality to
my device and why audio programs aren't able to recognize the device
capabilities.
--
Jeff Moore
Core Audio
Apple
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