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Something
Wednesday, July 18th, 2007 at 8:52:06am UTC 

  1. SWCODEC:
  2.  
  3. 1) Load compressed audio data from file
  4.  
  5. 2) Decode to PCM
  6.  
  7. 3) Apply DSP processing
  8.  
  9. 4) Send PCM data to DAC via DMA (or FIQ)
  10.  
  11. [Not currently implemented] Between tracks, check for audio format
  12. change (i.e.. samplerate) and configure DAC
  13.  
  14. HWCODEC (when PCM playback is implemented):
  15.  
  16. 1) Load compressed audio data from file
  17.  
  18. 2) Prepare data for sending to MAS - (bitswap for MPEG, bitswap and
  19.    maybe byteswap (depending on WAV/AIFF) WAV/AIFF, maybe decode
  20.    simple compressed formats to bitswapped PCM)
  21.  
  22. 3) Send data to MAS via DMA
  23.  
  24. Between tracks, may need to swap between MPEG and PCM codecs.

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