search for: stevenj

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2003 May 31
4
faster mdct's
Hello Vorbis folks, I'm one of the FFTW authors (www.fftw.org), and a few days ago I was playing with our codelet generator for fun and modified it to spit out hard-coded MDCTs of small sizes. The code (at jdj.mit.edu/~stevenj/mdct_128nr.c) for 256 samples (128 outputs) seems to be almost twice as fast as the Vorbis MDCT code for that size on my 2.2GHz P-IV (gcc 3.2.2 and flags "-O1 -mcpu=pentium4 -fomit-frame-pointer -fstrict-aliasing -malign-double"), in single precision. I guess the other size that is impor...