Re: compress audio programmatically
Re: compress audio programmatically
- Subject: Re: compress audio programmatically
- From: William Stewart <email@hidden>
- Date: Thu, 30 Apr 2009 15:44:11 -0700
there is not an aac encoder on the iphone at this time - so you are
probably not examing the result code of the new audio converter call,
and its failing
ima works fine
On Apr 30, 2009, at 1:22 PM, Andrew Smith wrote:
I have it working, except that now if I try to change from
outputFormat.mFormatID = kAudioFormatAppleIMA4;
to say,
outputFormat.mFormatID = kAudioFormatMPEG4AAC
it doesn't work. Not sure what's wrong, it seems to lockup.
Is there a trick to using other encoding formats?
best regards,
Andrew
On Wednesday, April 29, 2009, at 10:04PM, "William Stewart" <email@hidden
> wrote:
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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