RE: usb continuous output frequency format
RE: usb continuous output frequency format
- Subject: RE: usb continuous output frequency format
- From: "Kevin Vanwulpen" <email@hidden>
- Date: Tue, 24 Dec 2002 10:27:51 -0800
I had the same issue with my device. After struggling for a long enough time
with this I decided to change it to fixed sample rates (for example 44100,
48000 and whatever more sample rates you want to support). Since then it
always changes to the correct rate.
Regards, Kevin
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-----Original Message-----
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From: email@hidden
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[mailto:email@hidden]On Behalf Of Jeff Moore
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Sent: Tuesday, December 24, 2002 10:04 AM
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To: CoreAudio API
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Subject: Re: usb continuous output frequency format
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>
>
The HAL provides the API for discovering and changing the stream format
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of your device. The properties kAudioDevicePropertyNominalSampleRate
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and kAudioDevicePropertyAvailableNominalSampleRates are apropos here.
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>
The fact that most apps just leave the device set to one sample rate
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and do software rate conversion is pretty much common practice. There
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isn't anything your device can do to force them to change the format
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when they are happy with that arrangement.
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>
On Monday, December 23, 2002, at 03:58 PM, Mark Ketilson wrote:
>
>
> I have a USB device with an output channel that has continuous
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> frequency capability. It supports frequencies in a certain range and
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> returns that range. {4990, 55010} The device is set to 44.1 kHz as the
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> default.
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>
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> The problem I'm having is that no audio program changes the frequency
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> of my device when I play files of a frequency other than 44.1kHz. I'm
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> wondering if there is a suggested method to add this functionality to
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> my device and why audio programs aren't able to recognize the device
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> capabilities.
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>
--
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>
Jeff Moore
>
Core Audio
>
Apple
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