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Re: Exporting MP3 file using QT... What a doc!

On Mar 19, 2004, at 8:38 PM, Steve Nicolai wrote:

On Mar 19, 2004, at 1:38 PM, Mathieu Godart wrote:

Hi all!

I'm sorry for what -I think- will a really stupid and simple question. I've
never used the QT API, but I need it for a Cocoa program I'm writing.

This application needs to import a MP3 file and then convert it to AAC file.
I guess using QT for that is the best way to do, but I didn't though it
would be so complex to get what I need from the API.

I'm not exactly sure what you mean by an AAC file. Do you mean AAC in an
MPEG-4 container, which is also called .m4a? This is what iTunes will
create when it encodes a file. Or do you mean one of the various raw
AAC formats? <http://www.audiocoding.com/wiki/index.php?page=AAC> has
some minimal information if you scroll down to packaging.

If you want .m4a, you are in luck, QuickTime has an exporter for that. If
you want some raw AAC variant, you will need to handle the file format
yourself, either via the app or by writing an exporter.

As a side note, if you really do mean you want to write a .aac or .adts file (raw aac, no mpeg4 headers), you can use a combination of CoreAudio's AudioConverter api (to do the format conversion) and AudioFile api (to do the file format writing).

-Brad Ford
QuickTime Engineering
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References: 
 >Exporting MP3 file using QT... What a doc! (From: "Mathieu Godart" <email@hidden>)
 >Re: Exporting MP3 file using QT... What a doc! (From: Steve Nicolai <email@hidden>)



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