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CoreAudio and decoding/encoding MP3
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CoreAudio and decoding/encoding MP3


  • Subject: CoreAudio and decoding/encoding MP3
  • From: Ev <email@hidden>
  • Date: Thu, 28 Apr 2005 09:20:09 -0500

Peeking through CoreAudioTypes.h, I found a couple of format flags that I'm interested in: in particular kAudioFormatMPEGLayer3 and those handfuls of AACs.

If I wanted to use CoreAudio to decode MP3s, here are some questions I have with such a process:

#1 - I'm assuming it's not the LAME encoder/decoder - which coder is it, curiously?

#2 - if I have an AUFormatter set up with MP3 as the input and playback as the output and I ask it to render, would the AUFormatter like it if I gave it the ID3 tag data? Will it parse over that, or do I have to pass it raw MP3 data, jumping over the ID3 tag stuff? (aka do I have to parse the MP3 file myself)

#3 - are there any other flags in the ASBD that need note when dealing with MP3? bytesPerPacket, bytesPerFrame, etc?

Thanks in advance for any help!

Ev
Technical Knowledge Officer
Head Programmer/Designer
Audiofile Engineering

http://www.audiofile-engineering.com/

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