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Re: playing a growing file
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Re: playing a growing file

  • Subject: Re: playing a growing file
  • From: "Dave O'Neill" <email@hidden>
  • Date: Fri, 24 Jul 2015 11:43:14 -0700
One way to do it is to create an AudioFileID open for reading and writing using the Audio File Services Reference https://developer.apple.com/library/mac/documentation/MusicAudio/Reference/AudioFileConvertRef/ Then you create a ExtAudioFileID for reading only using ExtAudioFileWrapAudioFileID. This actually works, but writing to Audio file isn't that straightforward if it's not LPCM. 

On Fri, Jul 24, 2015 at 9:44 AM, Matthew Pease <email@hidden> wrote:
Hi all -

I've searched for a previous answer to this question, but did not find one.

In my IOS app, I record a stream to a file.   I then want to provide playback access to that file starting from any offset.  The user can listen to any part of that file by dragging a slider.

The problem is that the file is continuously growing while the new stream data arrives & is appended to the file.

ExtAudioFileSeek says that its behavior is undefined for files that are open for writing.  Also when I play the file back, I might move past a point which was the end of the file when the file was originally opened.

I suppose one way I could do it would be to continuously close & open the file.  open to write, then close it.   And then open it again to read the next part of the stream.  I can make the file an uncompressed format so that seeking within the file will be fast.

Does this sound like a good plan?  Any other possibilties?


Thank you-
Matt

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