Re: ExtendedAudioFile (AAC issue)
Re: ExtendedAudioFile (AAC issue)
- Subject: Re: ExtendedAudioFile (AAC issue)
- From: james mccartney <email@hidden>
- Date: Thu, 2 Aug 2007 11:57:20 -0700
How are you computing that you are missing 2112 frames? number of
packets times 1024 frames per packet? If so, you are missing the fact
that the AAC encoder has 2112 frames of priming which do not show up
in the output. This priming info is encoded into CAF files and can be
obtained. Different encoders may have different priming.
On Aug 2, 2007, at 11:44 AM, thomas rettich wrote:
Hi,
I use extendedAudio file API to write and read compressed AAC files.
My file writing code is based on the RecordAudioToFile (sample code).
ASBD = {44100.0, kAudioFormatMPEG4AAC, 0, 0, 1024, 0, 2, 0, 0};
when I try to read the AAC files created with ExtendedAudioFileRead,
all works fine,
except,
I cannot read the last 2112 frames.
ExtendedAudioFileRead always returns 0 frames, for these remaining
ones.
could there be a problem in the file writing sample code, or is
there something I have to set up in the reading
with extended audio file to be able to extract all frames ?
Any hints on how to sole this would be much appreciated!
Thanks in advance,
Thomas
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