Re: Core Audio question.
Re: Core Audio question.
- Subject: Re: Core Audio question.
- From: William Stewart <email@hidden>
- Date: Thu, 13 Jan 2005 11:33:57 -0800
John,
You have to also understand that the real scope of some of your
questions would take considerable time to answer fully - I think the
size and complexity of the questions you raised are really beyond our
ability to deal with in this forum...
Basically, all of the answers that Apple (and for that matter most of
the other people as well) provide are from people who have a real job
to perform, and the contributions to these kinds of lists are done
because we all know how these forums have helped us, so hopefully our
answers will help others. They are voluntary contributions... Its not
anyone's "job" to answer questions on these lists.
That said, a couple of suggestions:
(1) Make your posts and questions concise - given where you are with
your project try to think of things that will give you pointers to
areas that you can use to answer your own questions (or have more
concise or focussed follow up questions)
(2) Apple's Developer programs do provide what we call "Support
Incidences" - these are incidents you can raise with Apple Developer
Relations and have them actually look through your code/answer
questions/etc... They are one of the many benefits provided to you as a
paid-up Apple Developer. More details about these programs can be found
at http://developer.apple.com/
Keep posting! Try to find a format that will work though :-)
HTH
Bill
On 12/01/2005, at 6:42 PM, Jeff Moore wrote:
I'll try to answer what I remember.
QuickTime provides some flavor of GSM decoding already. I have no idea
what kind of GSM data it handles.
While there isn't a ton of documentation on the topic, there is a
section of our SDK devoted to developing AudioCodec components:
/Developer/Examples/CoreAudio/AudioCodecs. It has a sample IMA
implementation and shows all the basics, including how to make sure
your codec works with QuickTime Streaming.
As for using codecs, that falls to the AudioConverter API in the
AudioToolbox. There is also sample code for this API in our SDK.
/Developer/Examples/CoreAudio/Services/AudioFileTools comes to mind.
As for capturing audio and playing it back, your best bet is probably
going to be using the AUHAL and enabling input. I think there's a tech
note about doing this and most of our sample code that touches
hardware uses AUHAL one way or another.
Hope this helps.
On Jan 12, 2005, at 6:22 PM, Urs Heckmann wrote:
Hiya John,
well, most of us are probably pretty unfamiliar with GSM stuff... the
majority of people on this list certainly deal with audio effects,
midi and/or audio hardware drivers... some of us *use* codecs, but
hardly anyone *writes* them... the topic of "GSM" hasn't come up here
in more than a year that's conserved in my mail application, while
"codec" has a couple of hits for mp3, aac and other file formats...
If I understand correctly, you do have a GSM codec, and your question
is about how to implement it properly?!? - That would perhaps be
suited better for QuickTime-API (Codec components) or maybe Ipv6-dev
(VoIP...) mailing lists?
I don't know. Maybe Bill or the other CoreAudionauts know about that
stuff?
;) Urs
Am 13.01.2005 um 02:52 schrieb John Draper:
daniel wrote:
I guess since you asked the question on an Apple mailing list, we
all assumed you knew about this site:
http://lists.apple.com/mailman/listinfo
Good place to find other Apple-related lists, too.
Well - the codeaudio-api list apparently is a "washout"... I've
had NO responses
so far from anyone on that list. So I also posted it in the
cocoadev list.
--
Jeff Moore
Core Audio
Apple
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