Bluetooth devices with low sample rates and remoteIO
Bluetooth devices with low sample rates and remoteIO
- Subject: Bluetooth devices with low sample rates and remoteIO
- From: Jonathan <email@hidden>
- Date: Tue, 30 Aug 2011 17:53:09 -0700
Hello,
If I have a bluetooth device that is connected the audio session sets the sample rate at 8000 vs the 44100 that was requested. If I disable bluetooth input, the session sets the sample rate to 44100. I have have a couple questions regarding this behavior:
1) Since it records at a sample of rate of 8000, does the session select the lowest sample rate hard across the input and output device? In other words, does it prefer not to perform any conversion and thus selects the 8000 (input) vs the 44100 (output)?
2) Shouldn't I still be able to set up ASBDs with a sample rate of 44100, particularly the output node of the input on remote IO and have the audio unit resample the input up to 44100? When I do this, I'm getting all sorts of static as if there is resampling (or not) going on that is incompatible with the rest of the graph. I have other sources that are of higher sample rate that gets mixed in, so I'd prefer the input comes in at 44100 rather than downgrade the whole graph to 8000.
I'm seeing issues with conversion somewhere along the way.
More details on the graph:
RemoteIO MIC -> mixer bus 0 -> remoteIO SPEAKER
callback -> mixer bus 1 -> remoteIO SPEAKER
Any information on this would help.. thanks a lot!
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