Re: Problem with AAC and AudioFile
Re: Problem with AAC and AudioFile
- Subject: Re: Problem with AAC and AudioFile
- From: john <email@hidden>
- Date: Wed, 21 Jan 2004 18:33:49 -0500
Hi Bill,
Thanks for the additional info, I look forward to the new sample code.
If I've missed something, I apologise, but is there any way to set
details about the encoding quality or related variables? If not, what
is the standard compression rate?
-- John
AAC was first specified in MPEG-2.
MPEG-4 adding some additional tools to the basic codec (what is called
"Low Complexity AAC") such as PNS (Perceptual Noise Shaping), and
redefined a predictive tool defined in MPEG2 that was computationally
very complex (great english!) (and was specified in the Main Profile
version of AAC), to use LTP (Long Term Prediction) instead (which is
less computationally complex, but achieves a similar result in the
encoding quality)
set all fields to zero
set the type field to 'aac '
Sorry, its a little complex to explain the complete process... We're
trying to get the SDK out (but I keep thinking of one more thing to
add) that will provide extensive code to show you how to make, read,
play any file type known by the AudioFile API using that,
AudioConverter and the AU output units.
Bill
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