Re: Understanding ComplexPlayThru
Re: Understanding ComplexPlayThru
- Subject: Re: Understanding ComplexPlayThru
- From: Neil Clayton <email@hidden>
- Date: Thu, 7 Sep 2006 11:52:40 +0100
On a more interesting note, I removed the Varispeed unit from the
graph and modified the code so that the DefaultOutput AU stream
format is set to the ouptut format of the AUHAL (element 1).
Now it all 'just works'. I read somewhere that the DefaultOutput AU
had a AudioConverter inside - so assuming that's right and I'm not
making it up, does this mean that the Varispeed is was required some
time in the past, but is no longer? (e.g: old code?)
Neil
On 6/09/2006, at 9:33 AM, Neil Clayton wrote:
Hi Everyone.
I am currently looking through ComplexPlayThru in order to
understand it better. One of the tests I've been doing is to use
Soundflower as the input, and built-in-audio as the output.
Assuming both use the sample sample rate (which they do, as
confirmed in AMS) things work fine.
If I change the default output device to use a sample rate of
48000, then things are not quite as rosy. There is about 1s worth
of audio played, which is at a lower pitch (I think the varispeed
conversion ration was about 0.91 or thereabouts), and then it goes
pear shaped.
Pear shaped, for the moment I don't mind. What's confusing me is
that I would have thought he varispeed unit would have accounted
for the differences in sample rate, and therefore the audio
wouldn't be heard at a different pitch. Is this correct?
Regards,
Neil Clayton
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