AudioCodec questions
AudioCodec questions
- Subject: AudioCodec questions
- From: Brian Willoughby <email@hidden>
- Date: Sat, 31 May 2003 18:15:01 -0700
Hello,
There seems to be no documentation whatsoever for AudioCodecs outside the
source code in the AudioCodecSDK. That source does provide internal
information on an AudioCodec, but since I do not see any source for loading an
AudioCodec, a few questions remain about the interface between a new
AudioCodec, the Mac OS X system, and any potential host application. The only
place in the documentation which mentions AudioCodecs promises that they are
described in another document, but I cannot find that document.
How does one test an AudioCodec?
What programs load AudioCodecs?
If there are any programs that load all available AudioCodecs, how exactly do
they determine which AudioCodec to use?
What is the MagicCookie implied by kAudioCodecPropertyMagicCookie?
Are there any rules for setting the value of kPrimaryResourceID besides those
mentioned in the source? i.e. as long as I leave a gap for two consecutive
values, can I pick any value for kPrimaryResourceID?
Are negative values reserved by Apple for kPrimaryResourceID?
Where can I learn more about properties like
kAudioCodecPropertyMaximumPacketByteSize,
kAudioCodecPropertyRequiresPacketDescription,
kAudioCodecPropertyPacketBytesSizes, and kAudioCodecPropertyPacketFrameSize?
I realize that the answers to some of these questions should be similar to
those for a general AudioUnit, but I suspect that some of the details will be
slightly different for an AudioCodec.
Note: I am hoping to have an AudioCodec completed before WWDC 2003 begins, so
I do not wish to wait for the answers to be revealed in a session at the
conference. :-)
Thanks!
Brian Willoughby
Sound Consulting
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