Re: Core Audio question.
Re: Core Audio question.
- Subject: Re: Core Audio question.
- From: Jeff Moore <email@hidden>
- Date: Wed, 12 Jan 2005 18:42:57 -0800
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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