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how to estimate file size when writing audio files on IOS?
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how to estimate file size when writing audio files on IOS?


  • Subject: how to estimate file size when writing audio files on IOS?
  • From: Andy Davidson <email@hidden>
  • Date: Sun, 16 Dec 2012 10:35:06 -0800
  • Thread-topic: how to estimate file size when writing audio files on IOS?

Hi

I have an IOS app built using core audio and audio units. I am thinking about add the ability to create audio files. I want to make sure these audio files can be played on as many different systems as possible. 

Does CoreAudio provided a "write" codex anything other than  kAudioFileWAVEType  and kAudioFileM4AType ?

I realize I could probably cut the HZ in 1/2 to reduce audio file size if I was willing to accept lower quality.

How can I estimate how big the output audio file will be in advance?

Can I add arbitrary key/value data to the header of a m4a? I looked through AudioToolbox/ExtendedAudioFile.h but did not find much.

Thanks in advance

Andy




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