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AudioUnits and Volume
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AudioUnits and Volume


  • Subject: AudioUnits and Volume
  • From: Tobias Rundström <email@hidden>
  • Date: Thu, 2 Feb 2006 16:15:45 -0300

Hello,

A few months ago I wrote a CoreAudio output driver for XMMS2 (http:// xmms2.xmms.org) and it has been working beautifully ever since. Latest addition to the XMMS2 API is the ability to control volume on multiple channels. I would like to support this in the coreaudio driver also.

Two problems arise:

I have been searching the documents on apple.com and google and everywhere it seems to mention using CoreAudios HAL API to change volume. AudioDeviceGetProperty (...). Does this mean that I can't change volume for the higher level (AudioUnits)?

Even if I can manipulate the volume I can't find a good method to list available channels on the current device. Is there something for this in the CoreAudio API somewhere?

Thanks.

-- Tobias

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