719 lines
19 KiB
C
Executable file
719 lines
19 KiB
C
Executable file
/*Copyright (c) 2003-2004, Mark Borgerding
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Lots of modifications by Jean-Marc Valin
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Copyright (c) 2005-2007, Xiph.Org Foundation
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Copyright (c) 2008, Xiph.Org Foundation, CSIRO
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.*/
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/* This code is originally from Mark Borgerding's KISS-FFT but has been
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heavily modified to better suit Opus */
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#ifndef SKIP_CONFIG_H
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# ifdef HAVE_CONFIG_H
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# include "config.h"
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# endif
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#endif
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#include "_kiss_fft_guts.h"
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#include "arch.h"
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#include "os_support.h"
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#include "mathops.h"
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#include "stack_alloc.h"
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/* The guts header contains all the multiplication and addition macros that are defined for
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complex numbers. It also delares the kf_ internal functions.
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*/
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static void kf_bfly2(
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kiss_fft_cpx * Fout,
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const size_t fstride,
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const kiss_fft_state *st,
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int m,
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int N,
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int mm
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)
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{
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kiss_fft_cpx * Fout2;
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const kiss_twiddle_cpx * tw1;
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int i,j;
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kiss_fft_cpx * Fout_beg = Fout;
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for (i=0;i<N;i++)
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{
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Fout = Fout_beg + i*mm;
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Fout2 = Fout + m;
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tw1 = st->twiddles;
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for(j=0;j<m;j++)
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{
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kiss_fft_cpx t;
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Fout->r = SHR32(Fout->r, 1);Fout->i = SHR32(Fout->i, 1);
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Fout2->r = SHR32(Fout2->r, 1);Fout2->i = SHR32(Fout2->i, 1);
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C_MUL (t, *Fout2 , *tw1);
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tw1 += fstride;
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C_SUB( *Fout2 , *Fout , t );
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C_ADDTO( *Fout , t );
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++Fout2;
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++Fout;
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}
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}
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}
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static void ki_bfly2(
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kiss_fft_cpx * Fout,
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const size_t fstride,
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const kiss_fft_state *st,
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int m,
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int N,
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int mm
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)
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{
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kiss_fft_cpx * Fout2;
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const kiss_twiddle_cpx * tw1;
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kiss_fft_cpx t;
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int i,j;
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kiss_fft_cpx * Fout_beg = Fout;
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for (i=0;i<N;i++)
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{
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Fout = Fout_beg + i*mm;
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Fout2 = Fout + m;
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tw1 = st->twiddles;
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for(j=0;j<m;j++)
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{
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C_MULC (t, *Fout2 , *tw1);
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tw1 += fstride;
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C_SUB( *Fout2 , *Fout , t );
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C_ADDTO( *Fout , t );
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++Fout2;
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++Fout;
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}
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}
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}
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static void kf_bfly4(
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kiss_fft_cpx * Fout,
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const size_t fstride,
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const kiss_fft_state *st,
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int m,
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int N,
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int mm
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)
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{
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const kiss_twiddle_cpx *tw1,*tw2,*tw3;
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kiss_fft_cpx scratch[6];
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const size_t m2=2*m;
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const size_t m3=3*m;
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int i, j;
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kiss_fft_cpx * Fout_beg = Fout;
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for (i=0;i<N;i++)
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{
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Fout = Fout_beg + i*mm;
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tw3 = tw2 = tw1 = st->twiddles;
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for (j=0;j<m;j++)
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{
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C_MUL4(scratch[0],Fout[m] , *tw1 );
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C_MUL4(scratch[1],Fout[m2] , *tw2 );
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C_MUL4(scratch[2],Fout[m3] , *tw3 );
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Fout->r = PSHR32(Fout->r, 2);
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Fout->i = PSHR32(Fout->i, 2);
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C_SUB( scratch[5] , *Fout, scratch[1] );
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C_ADDTO(*Fout, scratch[1]);
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C_ADD( scratch[3] , scratch[0] , scratch[2] );
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C_SUB( scratch[4] , scratch[0] , scratch[2] );
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C_SUB( Fout[m2], *Fout, scratch[3] );
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tw1 += fstride;
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tw2 += fstride*2;
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tw3 += fstride*3;
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C_ADDTO( *Fout , scratch[3] );
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Fout[m].r = scratch[5].r + scratch[4].i;
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Fout[m].i = scratch[5].i - scratch[4].r;
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Fout[m3].r = scratch[5].r - scratch[4].i;
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Fout[m3].i = scratch[5].i + scratch[4].r;
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++Fout;
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}
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}
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}
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static void ki_bfly4(
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kiss_fft_cpx * Fout,
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const size_t fstride,
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const kiss_fft_state *st,
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int m,
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int N,
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int mm
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)
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{
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const kiss_twiddle_cpx *tw1,*tw2,*tw3;
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kiss_fft_cpx scratch[6];
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const size_t m2=2*m;
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const size_t m3=3*m;
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int i, j;
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kiss_fft_cpx * Fout_beg = Fout;
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for (i=0;i<N;i++)
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{
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Fout = Fout_beg + i*mm;
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tw3 = tw2 = tw1 = st->twiddles;
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for (j=0;j<m;j++)
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{
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C_MULC(scratch[0],Fout[m] , *tw1 );
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C_MULC(scratch[1],Fout[m2] , *tw2 );
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C_MULC(scratch[2],Fout[m3] , *tw3 );
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C_SUB( scratch[5] , *Fout, scratch[1] );
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C_ADDTO(*Fout, scratch[1]);
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C_ADD( scratch[3] , scratch[0] , scratch[2] );
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C_SUB( scratch[4] , scratch[0] , scratch[2] );
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C_SUB( Fout[m2], *Fout, scratch[3] );
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tw1 += fstride;
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tw2 += fstride*2;
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tw3 += fstride*3;
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C_ADDTO( *Fout , scratch[3] );
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Fout[m].r = scratch[5].r - scratch[4].i;
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Fout[m].i = scratch[5].i + scratch[4].r;
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Fout[m3].r = scratch[5].r + scratch[4].i;
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Fout[m3].i = scratch[5].i - scratch[4].r;
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++Fout;
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}
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}
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}
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#ifndef RADIX_TWO_ONLY
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static void kf_bfly3(
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kiss_fft_cpx * Fout,
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const size_t fstride,
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const kiss_fft_state *st,
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int m,
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int N,
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int mm
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)
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{
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int i;
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size_t k;
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const size_t m2 = 2*m;
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const kiss_twiddle_cpx *tw1,*tw2;
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kiss_fft_cpx scratch[5];
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kiss_twiddle_cpx epi3;
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kiss_fft_cpx * Fout_beg = Fout;
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epi3 = st->twiddles[fstride*m];
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for (i=0;i<N;i++)
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{
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Fout = Fout_beg + i*mm;
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tw1=tw2=st->twiddles;
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k=m;
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do {
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C_FIXDIV(*Fout,3); C_FIXDIV(Fout[m],3); C_FIXDIV(Fout[m2],3);
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C_MUL(scratch[1],Fout[m] , *tw1);
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C_MUL(scratch[2],Fout[m2] , *tw2);
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C_ADD(scratch[3],scratch[1],scratch[2]);
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C_SUB(scratch[0],scratch[1],scratch[2]);
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tw1 += fstride;
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tw2 += fstride*2;
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Fout[m].r = Fout->r - HALF_OF(scratch[3].r);
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Fout[m].i = Fout->i - HALF_OF(scratch[3].i);
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C_MULBYSCALAR( scratch[0] , epi3.i );
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C_ADDTO(*Fout,scratch[3]);
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Fout[m2].r = Fout[m].r + scratch[0].i;
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Fout[m2].i = Fout[m].i - scratch[0].r;
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Fout[m].r -= scratch[0].i;
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Fout[m].i += scratch[0].r;
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++Fout;
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} while(--k);
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}
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}
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static void ki_bfly3(
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kiss_fft_cpx * Fout,
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const size_t fstride,
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const kiss_fft_state *st,
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int m,
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int N,
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int mm
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)
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{
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int i, k;
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const size_t m2 = 2*m;
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const kiss_twiddle_cpx *tw1,*tw2;
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kiss_fft_cpx scratch[5];
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kiss_twiddle_cpx epi3;
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kiss_fft_cpx * Fout_beg = Fout;
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epi3 = st->twiddles[fstride*m];
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for (i=0;i<N;i++)
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{
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Fout = Fout_beg + i*mm;
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tw1=tw2=st->twiddles;
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k=m;
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do{
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C_MULC(scratch[1],Fout[m] , *tw1);
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C_MULC(scratch[2],Fout[m2] , *tw2);
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C_ADD(scratch[3],scratch[1],scratch[2]);
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C_SUB(scratch[0],scratch[1],scratch[2]);
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tw1 += fstride;
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tw2 += fstride*2;
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Fout[m].r = Fout->r - HALF_OF(scratch[3].r);
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Fout[m].i = Fout->i - HALF_OF(scratch[3].i);
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C_MULBYSCALAR( scratch[0] , -epi3.i );
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C_ADDTO(*Fout,scratch[3]);
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Fout[m2].r = Fout[m].r + scratch[0].i;
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Fout[m2].i = Fout[m].i - scratch[0].r;
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Fout[m].r -= scratch[0].i;
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Fout[m].i += scratch[0].r;
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++Fout;
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}while(--k);
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}
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}
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static void kf_bfly5(
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kiss_fft_cpx * Fout,
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const size_t fstride,
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const kiss_fft_state *st,
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int m,
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int N,
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int mm
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)
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{
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kiss_fft_cpx *Fout0,*Fout1,*Fout2,*Fout3,*Fout4;
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int i, u;
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kiss_fft_cpx scratch[13];
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const kiss_twiddle_cpx * twiddles = st->twiddles;
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const kiss_twiddle_cpx *tw;
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kiss_twiddle_cpx ya,yb;
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kiss_fft_cpx * Fout_beg = Fout;
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ya = twiddles[fstride*m];
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yb = twiddles[fstride*2*m];
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tw=st->twiddles;
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for (i=0;i<N;i++)
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{
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Fout = Fout_beg + i*mm;
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Fout0=Fout;
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Fout1=Fout0+m;
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Fout2=Fout0+2*m;
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Fout3=Fout0+3*m;
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Fout4=Fout0+4*m;
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for ( u=0; u<m; ++u ) {
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C_FIXDIV( *Fout0,5); C_FIXDIV( *Fout1,5); C_FIXDIV( *Fout2,5); C_FIXDIV( *Fout3,5); C_FIXDIV( *Fout4,5);
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scratch[0] = *Fout0;
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C_MUL(scratch[1] ,*Fout1, tw[u*fstride]);
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C_MUL(scratch[2] ,*Fout2, tw[2*u*fstride]);
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C_MUL(scratch[3] ,*Fout3, tw[3*u*fstride]);
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C_MUL(scratch[4] ,*Fout4, tw[4*u*fstride]);
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C_ADD( scratch[7],scratch[1],scratch[4]);
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C_SUB( scratch[10],scratch[1],scratch[4]);
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C_ADD( scratch[8],scratch[2],scratch[3]);
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C_SUB( scratch[9],scratch[2],scratch[3]);
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Fout0->r += scratch[7].r + scratch[8].r;
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Fout0->i += scratch[7].i + scratch[8].i;
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scratch[5].r = scratch[0].r + S_MUL(scratch[7].r,ya.r) + S_MUL(scratch[8].r,yb.r);
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scratch[5].i = scratch[0].i + S_MUL(scratch[7].i,ya.r) + S_MUL(scratch[8].i,yb.r);
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scratch[6].r = S_MUL(scratch[10].i,ya.i) + S_MUL(scratch[9].i,yb.i);
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scratch[6].i = -S_MUL(scratch[10].r,ya.i) - S_MUL(scratch[9].r,yb.i);
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C_SUB(*Fout1,scratch[5],scratch[6]);
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C_ADD(*Fout4,scratch[5],scratch[6]);
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scratch[11].r = scratch[0].r + S_MUL(scratch[7].r,yb.r) + S_MUL(scratch[8].r,ya.r);
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scratch[11].i = scratch[0].i + S_MUL(scratch[7].i,yb.r) + S_MUL(scratch[8].i,ya.r);
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scratch[12].r = - S_MUL(scratch[10].i,yb.i) + S_MUL(scratch[9].i,ya.i);
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scratch[12].i = S_MUL(scratch[10].r,yb.i) - S_MUL(scratch[9].r,ya.i);
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C_ADD(*Fout2,scratch[11],scratch[12]);
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C_SUB(*Fout3,scratch[11],scratch[12]);
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++Fout0;++Fout1;++Fout2;++Fout3;++Fout4;
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}
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}
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}
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static void ki_bfly5(
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kiss_fft_cpx * Fout,
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const size_t fstride,
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const kiss_fft_state *st,
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int m,
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int N,
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int mm
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)
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{
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kiss_fft_cpx *Fout0,*Fout1,*Fout2,*Fout3,*Fout4;
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int i, u;
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kiss_fft_cpx scratch[13];
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const kiss_twiddle_cpx * twiddles = st->twiddles;
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const kiss_twiddle_cpx *tw;
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kiss_twiddle_cpx ya,yb;
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kiss_fft_cpx * Fout_beg = Fout;
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ya = twiddles[fstride*m];
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yb = twiddles[fstride*2*m];
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tw=st->twiddles;
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for (i=0;i<N;i++)
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{
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Fout = Fout_beg + i*mm;
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Fout0=Fout;
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Fout1=Fout0+m;
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Fout2=Fout0+2*m;
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Fout3=Fout0+3*m;
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Fout4=Fout0+4*m;
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for ( u=0; u<m; ++u ) {
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scratch[0] = *Fout0;
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C_MULC(scratch[1] ,*Fout1, tw[u*fstride]);
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C_MULC(scratch[2] ,*Fout2, tw[2*u*fstride]);
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C_MULC(scratch[3] ,*Fout3, tw[3*u*fstride]);
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C_MULC(scratch[4] ,*Fout4, tw[4*u*fstride]);
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C_ADD( scratch[7],scratch[1],scratch[4]);
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C_SUB( scratch[10],scratch[1],scratch[4]);
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C_ADD( scratch[8],scratch[2],scratch[3]);
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C_SUB( scratch[9],scratch[2],scratch[3]);
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Fout0->r += scratch[7].r + scratch[8].r;
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Fout0->i += scratch[7].i + scratch[8].i;
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scratch[5].r = scratch[0].r + S_MUL(scratch[7].r,ya.r) + S_MUL(scratch[8].r,yb.r);
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scratch[5].i = scratch[0].i + S_MUL(scratch[7].i,ya.r) + S_MUL(scratch[8].i,yb.r);
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scratch[6].r = -S_MUL(scratch[10].i,ya.i) - S_MUL(scratch[9].i,yb.i);
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scratch[6].i = S_MUL(scratch[10].r,ya.i) + S_MUL(scratch[9].r,yb.i);
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C_SUB(*Fout1,scratch[5],scratch[6]);
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C_ADD(*Fout4,scratch[5],scratch[6]);
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scratch[11].r = scratch[0].r + S_MUL(scratch[7].r,yb.r) + S_MUL(scratch[8].r,ya.r);
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scratch[11].i = scratch[0].i + S_MUL(scratch[7].i,yb.r) + S_MUL(scratch[8].i,ya.r);
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scratch[12].r = S_MUL(scratch[10].i,yb.i) - S_MUL(scratch[9].i,ya.i);
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scratch[12].i = -S_MUL(scratch[10].r,yb.i) + S_MUL(scratch[9].r,ya.i);
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C_ADD(*Fout2,scratch[11],scratch[12]);
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C_SUB(*Fout3,scratch[11],scratch[12]);
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++Fout0;++Fout1;++Fout2;++Fout3;++Fout4;
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}
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}
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}
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|
|
|
#endif
|
|
|
|
|
|
#ifdef CUSTOM_MODES
|
|
|
|
static
|
|
void compute_bitrev_table(
|
|
int Fout,
|
|
opus_int16 *f,
|
|
const size_t fstride,
|
|
int in_stride,
|
|
opus_int16 * factors,
|
|
const kiss_fft_state *st
|
|
)
|
|
{
|
|
const int p=*factors++; /* the radix */
|
|
const int m=*factors++; /* stage's fft length/p */
|
|
|
|
/*printf ("fft %d %d %d %d %d %d\n", p*m, m, p, s2, fstride*in_stride, N);*/
|
|
if (m==1)
|
|
{
|
|
int j;
|
|
for (j=0;j<p;j++)
|
|
{
|
|
*f = Fout+j;
|
|
f += fstride*in_stride;
|
|
}
|
|
} else {
|
|
int j;
|
|
for (j=0;j<p;j++)
|
|
{
|
|
compute_bitrev_table( Fout , f, fstride*p, in_stride, factors,st);
|
|
f += fstride*in_stride;
|
|
Fout += m;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* facbuf is populated by p1,m1,p2,m2, ...
|
|
where
|
|
p[i] * m[i] = m[i-1]
|
|
m0 = n */
|
|
static
|
|
int kf_factor(int n,opus_int16 * facbuf)
|
|
{
|
|
int p=4;
|
|
|
|
/*factor out powers of 4, powers of 2, then any remaining primes */
|
|
do {
|
|
while (n % p) {
|
|
switch (p) {
|
|
case 4: p = 2; break;
|
|
case 2: p = 3; break;
|
|
default: p += 2; break;
|
|
}
|
|
if (p>32000 || (opus_int32)p*(opus_int32)p > n)
|
|
p = n; /* no more factors, skip to end */
|
|
}
|
|
n /= p;
|
|
#ifdef RADIX_TWO_ONLY
|
|
if (p!=2 && p != 4)
|
|
#else
|
|
if (p>5)
|
|
#endif
|
|
{
|
|
return 0;
|
|
}
|
|
*facbuf++ = p;
|
|
*facbuf++ = n;
|
|
} while (n > 1);
|
|
return 1;
|
|
}
|
|
|
|
static void compute_twiddles(kiss_twiddle_cpx *twiddles, int nfft)
|
|
{
|
|
int i;
|
|
#ifdef FIXED_POINT
|
|
for (i=0;i<nfft;++i) {
|
|
opus_val32 phase = -i;
|
|
kf_cexp2(twiddles+i, DIV32(SHL32(phase,17),nfft));
|
|
}
|
|
#else
|
|
for (i=0;i<nfft;++i) {
|
|
const double pi=3.14159265358979323846264338327;
|
|
double phase = ( -2*pi /nfft ) * i;
|
|
kf_cexp(twiddles+i, phase );
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
*
|
|
* Allocates all necessary storage space for the fft and ifft.
|
|
* The return value is a contiguous block of memory. As such,
|
|
* It can be freed with free().
|
|
* */
|
|
kiss_fft_state *opus_fft_alloc_twiddles(int nfft,void * mem,size_t * lenmem, const kiss_fft_state *base)
|
|
{
|
|
kiss_fft_state *st=NULL;
|
|
size_t memneeded = sizeof(struct kiss_fft_state); /* twiddle factors*/
|
|
|
|
if ( lenmem==NULL ) {
|
|
st = ( kiss_fft_state*)KISS_FFT_MALLOC( memneeded );
|
|
}else{
|
|
if (mem != NULL && *lenmem >= memneeded)
|
|
st = (kiss_fft_state*)mem;
|
|
*lenmem = memneeded;
|
|
}
|
|
if (st) {
|
|
opus_int16 *bitrev;
|
|
kiss_twiddle_cpx *twiddles;
|
|
|
|
st->nfft=nfft;
|
|
#ifndef FIXED_POINT
|
|
st->scale = 1.f/nfft;
|
|
#endif
|
|
if (base != NULL)
|
|
{
|
|
st->twiddles = base->twiddles;
|
|
st->shift = 0;
|
|
while (nfft<<st->shift != base->nfft && st->shift < 32)
|
|
st->shift++;
|
|
if (st->shift>=32)
|
|
goto fail;
|
|
} else {
|
|
st->twiddles = twiddles = (kiss_twiddle_cpx*)KISS_FFT_MALLOC(sizeof(kiss_twiddle_cpx)*nfft);
|
|
compute_twiddles(twiddles, nfft);
|
|
st->shift = -1;
|
|
}
|
|
if (!kf_factor(nfft,st->factors))
|
|
{
|
|
goto fail;
|
|
}
|
|
|
|
/* bitrev */
|
|
st->bitrev = bitrev = (opus_int16*)KISS_FFT_MALLOC(sizeof(opus_int16)*nfft);
|
|
if (st->bitrev==NULL)
|
|
goto fail;
|
|
compute_bitrev_table(0, bitrev, 1,1, st->factors,st);
|
|
}
|
|
return st;
|
|
fail:
|
|
opus_fft_free(st);
|
|
return NULL;
|
|
}
|
|
|
|
kiss_fft_state *opus_fft_alloc(int nfft,void * mem,size_t * lenmem )
|
|
{
|
|
return opus_fft_alloc_twiddles(nfft, mem, lenmem, NULL);
|
|
}
|
|
|
|
void opus_fft_free(const kiss_fft_state *cfg)
|
|
{
|
|
if (cfg)
|
|
{
|
|
opus_free((opus_int16*)cfg->bitrev);
|
|
if (cfg->shift < 0)
|
|
opus_free((kiss_twiddle_cpx*)cfg->twiddles);
|
|
opus_free((kiss_fft_state*)cfg);
|
|
}
|
|
}
|
|
|
|
#endif /* CUSTOM_MODES */
|
|
|
|
void opus_fft(const kiss_fft_state *st,const kiss_fft_cpx *fin,kiss_fft_cpx *fout)
|
|
{
|
|
int m2, m;
|
|
int p;
|
|
int L;
|
|
int fstride[MAXFACTORS];
|
|
int i;
|
|
int shift;
|
|
|
|
/* st->shift can be -1 */
|
|
shift = st->shift>0 ? st->shift : 0;
|
|
|
|
celt_assert2 (fin != fout, "In-place FFT not supported");
|
|
/* Bit-reverse the input */
|
|
for (i=0;i<st->nfft;i++)
|
|
{
|
|
fout[st->bitrev[i]] = fin[i];
|
|
#ifndef FIXED_POINT
|
|
fout[st->bitrev[i]].r *= st->scale;
|
|
fout[st->bitrev[i]].i *= st->scale;
|
|
#endif
|
|
}
|
|
|
|
fstride[0] = 1;
|
|
L=0;
|
|
do {
|
|
p = st->factors[2*L];
|
|
m = st->factors[2*L+1];
|
|
fstride[L+1] = fstride[L]*p;
|
|
L++;
|
|
} while(m!=1);
|
|
m = st->factors[2*L-1];
|
|
for (i=L-1;i>=0;i--)
|
|
{
|
|
if (i!=0)
|
|
m2 = st->factors[2*i-1];
|
|
else
|
|
m2 = 1;
|
|
switch (st->factors[2*i])
|
|
{
|
|
case 2:
|
|
kf_bfly2(fout,fstride[i]<<shift,st,m, fstride[i], m2);
|
|
break;
|
|
case 4:
|
|
kf_bfly4(fout,fstride[i]<<shift,st,m, fstride[i], m2);
|
|
break;
|
|
#ifndef RADIX_TWO_ONLY
|
|
case 3:
|
|
kf_bfly3(fout,fstride[i]<<shift,st,m, fstride[i], m2);
|
|
break;
|
|
case 5:
|
|
kf_bfly5(fout,fstride[i]<<shift,st,m, fstride[i], m2);
|
|
break;
|
|
#endif
|
|
}
|
|
m = m2;
|
|
}
|
|
}
|
|
|
|
void opus_ifft(const kiss_fft_state *st,const kiss_fft_cpx *fin,kiss_fft_cpx *fout)
|
|
{
|
|
int m2, m;
|
|
int p;
|
|
int L;
|
|
int fstride[MAXFACTORS];
|
|
int i;
|
|
int shift;
|
|
|
|
/* st->shift can be -1 */
|
|
shift = st->shift>0 ? st->shift : 0;
|
|
celt_assert2 (fin != fout, "In-place FFT not supported");
|
|
/* Bit-reverse the input */
|
|
for (i=0;i<st->nfft;i++)
|
|
fout[st->bitrev[i]] = fin[i];
|
|
|
|
fstride[0] = 1;
|
|
L=0;
|
|
do {
|
|
p = st->factors[2*L];
|
|
m = st->factors[2*L+1];
|
|
fstride[L+1] = fstride[L]*p;
|
|
L++;
|
|
} while(m!=1);
|
|
m = st->factors[2*L-1];
|
|
for (i=L-1;i>=0;i--)
|
|
{
|
|
if (i!=0)
|
|
m2 = st->factors[2*i-1];
|
|
else
|
|
m2 = 1;
|
|
switch (st->factors[2*i])
|
|
{
|
|
case 2:
|
|
ki_bfly2(fout,fstride[i]<<shift,st,m, fstride[i], m2);
|
|
break;
|
|
case 4:
|
|
ki_bfly4(fout,fstride[i]<<shift,st,m, fstride[i], m2);
|
|
break;
|
|
#ifndef RADIX_TWO_ONLY
|
|
case 3:
|
|
ki_bfly3(fout,fstride[i]<<shift,st,m, fstride[i], m2);
|
|
break;
|
|
case 5:
|
|
ki_bfly5(fout,fstride[i]<<shift,st,m, fstride[i], m2);
|
|
break;
|
|
#endif
|
|
}
|
|
m = m2;
|
|
}
|
|
}
|
|
|