CoreAudio and decoding/encoding MP3
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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