Re: Need guidance on choosing appropriate audio framework
Re: Need guidance on choosing appropriate audio framework
- Subject: Re: Need guidance on choosing appropriate audio framework
- From: chuck remes <email@hidden>
- Date: Thu, 5 Feb 2004 23:26:13 -0600
On Feb 5, 2004, at 5:19 PM, David Duncan wrote:
On Feb 5, 2004, at 05:11 PM, Chuck Remes wrote:
For iTunes to recognize it (e.g. during a drag & drop operation into
its window), I apparently need to create a MovieExporter and
MovieImporter. There appears to be sufficient sample code to figure
this out (though the docs are... difficult). If anyone has a pointer
to docs on iTunes codec management, please advise.
For FLAC in a not-Quicktime container you need the exporter/importer.
Otherwise you should only need the encoder/decoder.
Thank you for the clarification.
During my investigations I've looked at creating a 'sdec' via the old
Sound Manager. This would provide the basic functionality for
compressing/decompressing the sound file and would make it available
as a compression format within QuickTime for a sound track.
However, I've been lurking on this list for quite a while and noticed
that CoreAudio will eventually replace Carbon Sound Manager within
the QuickTime framework. Therefore, for the sake of future proofing a
new project, it appears that the right move is to create an
AudioCodec and an AudioConverter in CA. I realize QT doesn't use CA
yet, but it sounds as though that change is somewhat imminent (i.e.
before the year is out). This is a hobby project for me (I normally
work on I/OKit drivers), so there isn't any particular deadline I
must adhere to.
The message that I got at WWDC was that if you create a
kAudioDecoderComponentType/kAudioEncoderComponentType type component
to decode/encode your format, then Quicktime will pick it up
automatically via a bridging mechanism, however this may or may not
have made it to Panther/QT 6.5. You may want to ask about those
component types on the Quicktime-API list.
I'll post a note there asking for some confirmation of this.
So is it true to say that QuickTime is already a client of CoreAudio?
If true, this is good news since I'd rather write this thing in C++.
The old Sound Manager interface macros looked a bit scary to me (
ComponentSelectorOffset (6), ComponentRangeCount (2), etc.). All of
that probably still exists but is hidden by the base class.
cr
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