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Re: Problem with AAC and AudioFile
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Re: Problem with AAC and AudioFile


  • Subject: Re: Problem with AAC and AudioFile
  • From: William Stewart <email@hidden>
  • Date: Wed, 21 Jan 2004 16:19:24 -0800

On 21/01/2004, at 3:14 PM, Adam Ohren wrote:

If I create an AudioStreamBasicDescription with a FormatID kAudioFormatMPEG4AAC, how do I deliver my data to CoreAudio? Can I just open an m4a file and feed in the raw contents of the file?

You need to pull the data (basically you can use the QT API's for this) and package it up in the input callback of the audio converter. As I said this is a little complicated to go into over email, we'll try and get this code done in the next few days

Bill


Thanks oodles again,
Adam Ohren
- email@hidden


------ ORIGINAL MESSAGE ------

The AudioFile API supports the ADTS file - this is an MPEG2 defined bit stream, but it is not MPEG-4.

QT can make mp4 files, and the iTune's m4a files are essentially MPEG-4 files that have just audio data in them.

At this stage there's no direct bridge between these two bit streams, but this will be addressed at some point

Bill
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