Rewrite the SBR decoder QMF analysis filter on top of the IMDCT instead of the RDFT.
This is based on a procedure to implement the filterbank on the DCT-IV described in Hsu, H.W. et al. "A Complex Quadrature Mirror Filterbanks for MPEG-4 HE-AAC" http://sites.google.com/site/wenchiehlee1020/Papers/ComplexFB_AES_121paper144.pdf Originally committed as revision 23516 to svn://svn.ffmpeg.org/ffmpeg/trunk
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