[Mp4-tech][audio] SBR to AAC delay?

[Danijel Domazet]

Hi all,
Can someone explain the SBR (no PS) delay related to core AAC encoder? 
For example, lets say we have: 
Frame x+0: 2048 samples (0001 to 2048) sent to SBR's QMF bank
Frame x+1: 2048 samples (2049 to 4096) sent to SBR's QMF bank
Frame x+2: 2048 samples (4097 to 6144) sent to SBR's QMF bank
etc... 
Frame x+0: What 2048 samples should be sent to 2:1 downsampler which would than produce 1024 samples for core AAC's MDCT filterbank? 
Frame x+1: ?
Frame x+2: ? 
And why?
Daniel
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