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accessing input format of an audiounit in a graph

Subject: accessing input format of an audiounit in a graph
From: Daniel Oberhoff <email@hidden>
Date: Sun, 25 Mar 2007 16:09:31 +0200
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Hi,

I am trying to play audio from my sample editor app through an au graph which consists of effects and a standard output unit at the end. I set a render callback in the head unit of the graph which pulls data through a converter. To find the target format for the converter I query the head au, but I always get an invalid format, or rather it seems the query doesn't fill in anything. The graph is updated and initialized at this point (as reported by the relevant graph functions). Before I had naively tried to set the input format on the au manually as I had done when playing directly to the output au, but there I had gotten an error, telling me the unit was not initialized. Now there is no way to ask a unit if it is initialized, but I suppose when the graph is updated and initialized the units in it will also?

Daniel Oberhoff

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