Rewrite the SBR decoder QMF analysis filter on top of the IMDCT instead of the RDFT.
authorAlex Converse <alex.converse@gmail.com>
Mon, 7 Jun 2010 21:52:08 +0000 (21:52 +0000)
committerAlex Converse <alex.converse@gmail.com>
Mon, 7 Jun 2010 21:52:08 +0000 (21:52 +0000)
commit932963b8e2e96b3d8c7506d9cf093b54f89d1e78
tree834d494d60c3f8fce93438b53c5f4164698ee984
parent082a0a33c45d9bc4f3a8d9b1365b5416485ed388
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
libavcodec/aacsbr.c
libavcodec/sbr.h