Re: Sampling Rate Support
Re: Sampling Rate Support
- Subject: Re: Sampling Rate Support
- From: Jeff Moore <email@hidden>
- Date: Wed, 23 Apr 2003 18:37:49 -0700
You are reporting the fact that your hardware does a continuous range
correctly. It's just that most apps don't really care about the sample
rate of the hardware. They will just use whatever is set when they
launch and do rate conversion to get their data into the right sample
rate. Apps that do care, tend to care only about the commonly used
sample rates, like 44100, 48000, 96000, etc.
At any rate, the HAL reports the continuous range via
kAudioDevicePropertyAvailableNominalSampleRates since the
AudioStreamBasicDescriptions provided through
kAudioDevicePropertyStreamFormats or
kAudioStreamPropertyPhysicalFormats will report the rate as
kAudioStreamAnyRate.
On Wednesday, April 23, 2003, at 05:10 PM, BlazeAudio Developer wrote:
Does a driver need to specify "discreet" sampling rates even when the
hardware can support a range of sampling rates?
We have a device which can support a range of sampling rates, and so we
call addAvailableFormat() with the minimum and maximum rates.
However, some applications do not seem to "realize" this and claim that
the device does not support anything except 44.1K!
Thanks.
Devendra.
--
Jeff Moore
Core Audio
Apple
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