Re: Audio Buffers
Re: Audio Buffers
- Subject: Re: Audio Buffers
- From: john <email@hidden>
- Date: Fri, 10 Oct 2003 22:17:59 -0400
Hi Daniel,
If you're wanting to save the data from a float - which is the type
coming through the IOProc - to a double, the simplest method would be
to just do a for loop and copy the mData into your array.
Michael Thornburgh's excellent MTCoreAudio framework comes with an
example app (AudioMonitor) that has a routine called audio_copy() which
has a reasonably extensive example of copying data from the inInputData
parameter, though it might be more complicated than what you're looking
for.
Personally what I've done is just declare a regular float array that's
sole purpose is to hold the data from the IOProc for processing. I do a
memcpy on the inInputData->mBuffers[0].mData into the array. If you
want to save the data permanently, you could save into an NSData but it
would probably get very large - maybe a better idea is to create
another thread that saves to disk.
Hope this helps.
-- John
Ok, so I have this audio buffer and I need to convert it to a double
array to read it into my FFT. I know that most of you know the answer
to this, and it's not listed anywhere in the docs, so please just take
30 seconds to help me out... All I need is to convert an Audio Buffer
into a double array. Thanks.
Daniel Currie
Hi, I'm new to this, so I hope you don't mine some newbie questions...
I've just finished setting up an audio recorder, based on Kurt Revis's
example on the CoreAudio Swiki
(http://www.mat.ucsb.edu:8000/CoreAudio/13). In the IOProc I end up
with an AudioBufferList, inInputData. So I guess I can get the buffer
by using inInputData and mBuffers[0], and then I want to get the mData
from the buffer, I think... Would &inInputData->mBuffers[0].mData be
the right syntax? What sort of format is this data in? Can I just
read it into an NSData object? NSArray?
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