Re: Setting a graph's sample rate
Re: Setting a graph's sample rate
- Subject: Re: Setting a graph's sample rate
- From: Geoff Hufford <email@hidden>
- Date: Thu, 02 Mar 2006 17:16:02 -0600
On 3/2/06 1:04 PM, "William Stewart" <email@hidden> wrote:
> Before you call AUGraphInitialize, go
> through all of the nodes in the graph and set all of their outputs to
> 48000 (except of course the output unit, where you can't set the
> hardware side's format).
>
> So, then when you connect the graph up (this is one of the things
> AUGraphInitialise will do for you), the source of a connection is
> used to define the format of the connection. So, the formats you have
> established at the output stages (48000) will then propogate through
> to the input side of each connection.
Thanks Bill. That fixed it with the addition of also needing to set the
Input of the Output unit.
I am curious if there is a way to gauge if it makes a difference with the
performance. Using 7 48k stereo sound files playing simultaneously, activity
monitor didn¹t show a noticeable difference whether my graph was at 44k or
48k. I believe that having the graph at 48k means that the 7 sources are
mixed together and then a single SR Convert to change it to 44k for the
output. Whereas if the graph is at 44k then all 7 sources get converted to
44k prior to mixing.
Is the built in sound output on a PB G4 limited to 44100? Do other machines
support different rates with the built in hardware? I assume there is a way
to inquire what rates the sound hardware supports, but I will tackle that
later on.
Geoff
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