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Re: AudioQueueOfflineRender question

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Re: AudioQueueOfflineRender question

Subject: Re: AudioQueueOfflineRender question
From: K Staring <email@hidden>
Date: Thu, 31 Jul 2008 22:02:00 +0200

Hi,

Maybe I had the whole process thought out backwards.. How should AudioQueueOfflineRender() work, precisely? I'm having some trouble determining which function will supply and receive what kind of data.

Is it like this?

- in an outputcallback of AudioQueue 'readAudioQueue':
  - read compressed data with AudioFileReadFrames() into an AudioBuffer
    owned by 'decompressAudioQueue'
  - feed this buffer to AudioQueueOfflineRender(decompressAudioQueue)
    - AudioQueueOfflineRender() calls outputcallback of AudioQueue
      'decompressAudioQueue' with an AudioBuffer containing the
      decompressed data
      - 'decompressAudioQueue' rendercallback can do something
        with the decompressed data

Or like this?

- in an outputcallback of AudioQueue 'readAudioQueue':
  - read compressed data with AudioFileReadFrames() into an AudioBuffer
    owned by 'decompressAudioQueue'
  - feed this buffer to AudioQueueOfflineRender(decompressAudioQueue)
    - AudioQueueOfflineRender() renders data back into its supplied
      buffer using no 'decompressAudioQueue' outputcallback
  - outputcallback now has uncompressed data in buffer fed to
    AudioQueueOfflineRender() and can doe something with the
    decompressed data

Of finally, like this? (my original setup which I can't get to work)

- in an outputcallback of AudioQueue 'readAudioQueue':
  - feed a buffer owned by decompressAudioQueue with undefined data to
    AudioQueueOfflineRender(decompressAudioQueue)
    - AudioQueueOfflineRender(decompressAudioQueue) calls outputcallback
      of AudioQueue 'decompressAudioQueue' with its supplied buffer
      - outputcallback of AudioQueue 'decompressAudioQueue' reads
        compressed data with AudioFileReadFrames() into its supplied
        buffer
    - AudioQueueOfflineRender(decompressAudioQueue() decompresses audio
      from its supplied buffer into its supplied buffer

Can anyone tell me which one is correct? Or did I have it wrong 3 times now? ;)


Thanks,

Khamba Staring
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References:  
  >AudioQueueOfflineRender question (From: "K. Staring" <email@hidden>)




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