Re: New to converter.
Re: New to converter.
- Subject: Re: New to converter.
- From: John Draper <email@hidden>
- Date: Fri, 11 Jan 2008 15:27:50 -0800
Aurélien Ammeloot wrote:
Hi,
I'm looking for a simple tutorial or well commented sample code in
order to open an audio file and convert it in a linear PCM stream.
Apple's documentation is quite confusing me. As CoreAudio,
AudioToolbox and AudioUnit frameworks all seem to provide tools to
work on but I must officially admit that I don't understand how to use
these tools as I haven't read well explained code yet. Even the sample
projects: afconvert and ConvertFile do not help very much (no comment
in the former's code).
I just would like to transfer the PCM stream to LAME to convert it all
to MP3, but that seems simpler according to LAME's api documentation.
I'm using Leopard and do not require backwards compatibility.
Any useful resource appreciated.
Thanks,
AA
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Welcome to a very large crowd of people who ALSO wants to do this.
Initially, we used MTCoreAudio for this application, but apparently
the Author is no longer supporting it due to 'Conflict of Interest'
issues, so we are just going to ditch it in our application as being
totally unusable... Which is too bad, because it does a lot of the
work one doesn't really want to do.
In their updated version, we were unable to get the MTConversionBuffer
to spit out 16 bit samples into our sample buffer. Apparently the
Author didn't seem to think that people would still want to use 8k/sec
samples, and he apparently took this out of the new version as far as
I've been able to determine.
None of us can figure out how to use it, and if I had known it would be
this difficult to use MTCoreAudio, I would have made an effort to use
the lower level procedural code, but (sigh) there is a large lack of
examples in this area.
I guess it's time to "cash in" on an instance of support from Apple soon.
John
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