Forum: µC & Digital Electronics Helix AAC decoder

von jrmymllr j. (jrmymllr)

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This is a long shot, but has anyone used the Helix AAC decoder?  I do 
and it works great, but I'm annoyed that it hardcodes zero as the 
reported bitrate.  Has anyone figured this out?  I haven't even had any 
luck figuring out how to extract the bitrate from an AAC stream.

von Andreas S. (andreas) (Admin) Flattr this

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I have used it, see http://embdev.net/articles/ARM_MP3/AAC_Player.

I'm afraid I can't really you with your question, but I'll try. I think 
that in MP3, the bitrate is directly coded in the frame header, and 
that's where Helix gets it from. In AAC, there is no such field in the 
header, at least not for all stream formats; you might have to calculate 
it from the frame size yourself.


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