Re: Buffer and CoreAudio ?

Subject: Re: Buffer and CoreAudio ?

From: William Stewart <email@hidden>

Date: Tue, 28 Nov 2006 12:15:37 -0800

Delivered-to: email@hidden

Have a look in the SDK example code - /Developer/Examples/CoreAudio - there is a set of examples there in a SimpleSDK directory including DefaultOutputUnit that shows you how the various ASBD options need to be configured (as for linear PCM there are dependencies).

Also, there is a document available now on Apple's developer support site (developer.apple.com) that goes through some basic principles and introductions of the CA API set

Bill

On 28/11/2006, at 5:00 AM, Matthieu Renault wrote:

Hello,

i am totally new to Audio.
I am seeking to find the best way to make a very simple application :
- I need to record audio then to have that sound as buffer
- I need to get that buffer and send it to another function i made with parameters.

Format :
- WAVE
- 8000 Khz
- 16 bits

My questions are:
#1 what is best to use CoreAudio or Quicktime ?
#2 Why is it so hard to get AudioStreamBasicDescription gAACFormat = {8000, kAudioFormatLinearPCM, kLinearPCMFormatFlagIsPacked | kLinearPCMFormatFlagIsSignedInteger, 2, 1, 2, 1, 16, 0}; informations relative to format options. Exemple, if i change number of channels size i get a fail in the file creation.
#3 i need to Set buffer ize but without success (i based my first try on CoreAudio sample source on Apple website)

Maybe these questions were already treated but i cannot find explicit answers.

thanks for your help

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References:

>RE: Bug in CoreAudio, Channel Names property? (From: "Alex Sheh" <email@hidden>)

>Buffer and CoreAudio ? (From: Matthieu Renault <email@hidden>)