Re: compress audio programmatically
Re: compress audio programmatically
- Subject: Re: compress audio programmatically
- From: William Stewart <email@hidden>
- Date: Wed, 29 Apr 2009 21:04:23 -0700
Have a look at the ConvertFile example in /Developer/Examples/
CoreAudio/SimpleSDK/
that gives you a basic example of how to use the converter
Bill
On Apr 29, 2009, at 6:52 PM, Andrew Smith wrote:
Thanks for the information. I had no idea that I could use the
AudioConverter on the iPhone.
I think I can figure out how to set it up, but I'm wondering now if
its possible for me to use the AudioConverter in real time, from
within my recording callback. Or, do I need to wait until the file
is saved, and then convert it.
It seems that AudioConverterFillComplexBuffer wants its own
callback, so I'm confused on this point.
regards
Andrew Smith
On Wednesday, April 29, 2009, at 06:33PM, "William Stewart" <email@hidden
> wrote:
what kind of compression do you want?
you can do any of the compression that you currently would do with
audio queue with Extended Audio File - (which uses the audio
converter, which you can use as well)
On Apr 29, 2009, at 2:09 PM, Andrew Smith wrote:
Hello
(iPhone platform)
I need to do some audio analysis on the incoming audio stream, and
then save it to a file. I am doing this now successfully using
AudioQueues.
I would like to be able to compress the audio so that the saved
files will not be so large. To my understanding, if I set up a
compressed format, then the incoming audio in the handler is already
compressed, so I can't analyze it. I have tried this.
Is anyone aware of either 1) a way to use the SDK to do the
compression, or 2) an existing library or some code that I could
link in, to compress the PCM manually.
many thanks
Andrew Smith
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