Re: AudioCodec questions
Re: AudioCodec questions
- Subject: Re: AudioCodec questions
- From: Chris Reed <email@hidden>
- Date: Sun, 1 Jun 2003 13:45:10 -0500
I think the one of the Apple guys said something a while back about
this. From what I remember, there is currently no way to iterate over
or load AudioCodecs. And there is no documentation available. They've
said before that if you want to write a codec, ask your questions on
this list and they'll help.
-chris
On Saturday, May 31, 2003, at 08:15 PM, Brian Willoughby wrote:
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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