[FFmpeg-devel] Fixpoint FFT optimization, with MDCT and IMDCT wrappers for audio optimization

[mmh]

Diego Biurrun writes:
 > On Fri, Jul 27, 2007 at 06:56:14AM -0400, mmh wrote:
 > > 
 > > I could really use some help on the integration aspects of this patch.
 > > The intent of this is to be able to implement optimized audio codecs
 > > for architectures with out floating point operations.  This is part of
 > > the cook fixpoint patch but its a little more general.
 > > 
 > > --- Makefile	(revision 9807)
 > > +++ Makefile	(working copy)
 > > @@ -460,6 +460,6 @@
 > >  
 > > -fft-test: fft-test.o $(LIB)
 > > +fft-test: fft-test.o $(LIB) fft_fixpoint.o
 > 
 > nit: Keep the $(LIB) at the end.
 > 
 > > --- fft-test.c	(revision 9807)
 > > +++ fft-test.c	(working copy)
 > > @@ -153,13 +153,47 @@
 > >  
 > > +    if (do_fixpoint) {
 > > +        for(i=0;i<n;i++) {
 > 
 > I think leaving a space after the for is slightly preferred.
 > 
 > >      av_log(NULL, AV_LOG_INFO,"usage: fft-test [-h] [-s] [-i] [-n b]\n"
 > >             "-h     print this help\n"
 > >             "-s     speed test\n"
 > >             "-m     (I)MDCT test\n"
 > > +           "-f     check fixpoint\n"
 > 
 > fixEDpoint :)
 > 
 > > @@ -171,11 +205,13 @@
 > >      int do_inverse = 0;
 > > +    int do_fixpoint = 0;
 > 
 > ditto
 > 
 > > +            ff_fixpoint_mdct_init (m, fft_nbits, do_inverse);
 > 
 > same here
 > 
 > > +            ff_fixpoint_fft_init (s, fft_nbits, do_inverse);
 > 
 > and here
 > 
 > > --- fft_fixpoint.c	(revision 0)
 > > +++ fft_fixpoint.c	(revision 0)
 > > @@ -0,0 +1,294 @@
 > > +
 > > +/**
 > > + * @file fft_fixpoint.c
 > 
 > Please rename this file to fft_fixedpoint.c.
 > 
 > > + * This module defines several fixpoint spectrum analysis tools.
 > 
 > And replace all the occurrences of fixpoint with fixedpoint in this
 > file.
 > 

Done!

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