Re: Some basic Audio device questions
Re: Some basic Audio device questions
- Subject: Re: Some basic Audio device questions
- From: Jeff Moore <email@hidden>
- Date: Tue, 11 May 2004 14:20:54 -0700
Apart from a bug in the HAL that causes the list of rate ranges to
overlap or otherwise appear out of order for devices whose ranges are
complex, I'm unaware of any such problem.
Would you care to elaborate on this? Which devices are causing trouble
and what are they saying that is wrong?
On May 11, 2004, at 11:48 AM, Shaun Wexler wrote:
On May 11, 2004, at 9:17 AM, Brad Ford wrote:
On May 11, 2004, at 7:56 AM, Robert Grant wrote:
I'm using the wonderful MTCoreAudio framework to access the
properties of the various audio devices connected to my computer and
I've got some questions about how to interpret the responses.
When I list the nominalSampleRates I get an array of arrays where
each subarray lists the low and high of a range of sample rates.
What's the best way to turn that into into a menu of available
sample rates?
Well, you want your user to pick a particular sample rate, not a
range, so you probably want to start with a static array of all the
sample rates you'd like to populate the menu with, then filter out
the ones that are disallowed by the ranges returned in nominal sample
rates. For extra credit, you could provide a text input field where
the user could type in an arbitrary sample rate, which you would
validate against the valid nominal sample rate ranges.
Beware that some device drivers still don't report their ranges
correctly. Expect to see only a minimum value, which "is" the
supported nominal rate. Prior to 10.3, many host app's did not
interpret these ranges correctly either.
--
Shaun Wexler
MacFOH
http://www.macfoh.com
--
Jeff Moore
Core Audio
Apple
_______________________________________________
coreaudio-api mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/coreaudio-api
Do not post admin requests to the list. They will be ignored.