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QT-CA bridge optimal audio format?
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QT-CA bridge optimal audio format?


  • Subject: QT-CA bridge optimal audio format?
  • From: Austin Shoemaker <email@hidden>
  • Date: Sun, 25 Jan 2004 05:15:01 -0800

I am writing a bridge to allow QuickTime media to play through the AUHAL. The purpose of this class is so I can route all QuickTime content to any stereo pair on any multichannel device. It vends Components for each stereo pair of a CoreAudio device (or mono stream, if desired). Then you just set your media's sound output to the appropriate Component.

My most recent expedition into unknown territory involved learning too much about Component Manager UPPs, but now that's over with.

In terms of getting the right data into the HAL, would you recommend that I restrict the Apple Mixer component to provide 32-bit floating point data so I can funnel that directly into AUHAL, or that I accept a variety of input formats and reconfigure the AUHAL to do the conversion? The former solution seems simpler, but is the latter better?

Thanks for the input.

Austin
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