mirror of https://github.com/VDR4Arch/vdr.git
94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/*
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* srfft_kni.c
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*
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* Copyright (C) Yuqing Deng <Yuqing_Deng@brown.edu> - April 2000
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*
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* 64 and 128 point split radix fft for ac3dec
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*
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* The algorithm is desribed in the book:
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* "Computational Frameworks of the Fast Fourier Transform".
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*
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* The ideas and the the organization of code borrowed from djbfft written by
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* D. J. Bernstein <djb@cr.py.to>. djbff can be found at
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* http://cr.yp.to/djbfft.html.
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*
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* srfft.c is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* srfft.c is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#ifdef __i386__
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#include <stdio.h>
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#include "srfft_kni.h"
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#include "srfftp.h"
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void fft_64p_kni(complex_t *a)
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{
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fft_8_kni(&a[0]); fft_4_kni(&a[8]); fft_4_kni(&a[12]);
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fft_asmb_kni(2, &a[0], &a[8], &delta16[0], &delta16_3[0]);
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fft_8_kni(&a[16]), fft_8_kni(&a[24]);
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fft_asmb_kni(4, &a[0], &a[16],&delta32[0], &delta32_3[0]);
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fft_8_kni(&a[32]); fft_4_kni(&a[40]); fft_4_kni(&a[44]);
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fft_asmb_kni(2, &a[32], &a[40], &delta16[0], &delta16_3[0]);
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fft_8_kni(&a[48]); fft_4_kni(&a[56]); fft_4_kni(&a[60]);
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fft_asmb_kni(2, &a[48], &a[56], &delta16[0], &delta16_3[0]);
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fft_asmb_kni(8, &a[0], &a[32],&delta64[0], &delta64_3[0]);
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}
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void fft_128p_kni(complex_t *a)
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{
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fft_8_kni(&a[0]); fft_4_kni(&a[8]); fft_4_kni(&a[12]);
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fft_asmb_kni(2, &a[0], &a[8], &delta16[0], &delta16_3[0]);
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fft_8_kni(&a[16]), fft_8_kni(&a[24]);
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fft_asmb_kni(4, &a[0], &a[16],&delta32[0], &delta32_3[0]);
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fft_8_kni(&a[32]); fft_4_kni(&a[40]); fft_4_kni(&a[44]);
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fft_asmb_kni(2, &a[32], &a[40], &delta16[0], &delta16_3[0]);
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fft_8_kni(&a[48]); fft_4_kni(&a[56]); fft_4_kni(&a[60]);
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fft_asmb_kni(2, &a[48], &a[56], &delta16[0], &delta16_3[0]);
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fft_asmb_kni(8, &a[0], &a[32],&delta64[0], &delta64_3[0]);
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fft_8_kni(&a[64]); fft_4_kni(&a[72]); fft_4_kni(&a[76]);
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/* fft_16(&a[64]); */
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fft_asmb_kni(2, &a[64], &a[72], &delta16[0], &delta16_3[0]);
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fft_8_kni(&a[80]); fft_8_kni(&a[88]);
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/* fft_32(&a[64]); */
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fft_asmb_kni(4, &a[64], &a[80],&delta32[0], &delta32_3[0]);
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fft_8_kni(&a[96]); fft_4_kni(&a[104]), fft_4_kni(&a[108]);
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/* fft_16(&a[96]); */
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fft_asmb_kni(2, &a[96], &a[104], &delta16[0], &delta16_3[0]);
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fft_8_kni(&a[112]), fft_8_kni(&a[120]);
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/* fft_32(&a[96]); */
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fft_asmb_kni(4, &a[96], &a[112], &delta32[0], &delta32_3[0]);
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/* fft_128(&a[0]); */
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fft_asmb_kni(16, &a[0], &a[64], &delta128[0], &delta128_3[0]);
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}
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#endif
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