From 65649de515257493dd1b8db599201097208677bb Mon Sep 17 00:00:00 2001 From: Michael Giacomelli Date: Sun, 10 May 2009 23:18:04 +0000 Subject: Patch by Mohamed Tarek from FS #10182. Remove floating point code (FFT, MDCT, etc) from libcook. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20902 a1c6a512-1295-4272-9138-f99709370657 --- apps/codecs/libcook/mdct.c | 229 --------------------------------------------- 1 file changed, 229 deletions(-) (limited to 'apps/codecs/libcook/mdct.c') diff --git a/apps/codecs/libcook/mdct.c b/apps/codecs/libcook/mdct.c index cb3388f6ff..e69de29bb2 100644 --- a/apps/codecs/libcook/mdct.c +++ b/apps/codecs/libcook/mdct.c @@ -1,229 +0,0 @@ -/* - * MDCT/IMDCT transforms - * Copyright (c) 2002 Fabrice Bellard - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ -#include "dsputil.h" - -/** - * @file libavcodec/mdct.c - * MDCT/IMDCT transforms. - */ - -// Generate a Kaiser-Bessel Derived Window. -#define BESSEL_I0_ITER 50 // default: 50 iterations of Bessel I0 approximation -av_cold void ff_kbd_window_init(float *window, float alpha, int n) -{ - int i, j; - double sum = 0.0, bessel, tmp; - double local_window[n]; - double alpha2 = (alpha * M_PI / n) * (alpha * M_PI / n); - - for (i = 0; i < n; i++) { - tmp = i * (n - i) * alpha2; - bessel = 1.0; - for (j = BESSEL_I0_ITER; j > 0; j--) - bessel = bessel * tmp / (j * j) + 1; - sum += bessel; - local_window[i] = sum; - } - - sum++; - for (i = 0; i < n; i++) - window[i] = sqrt(local_window[i] / sum); -} - -DECLARE_ALIGNED(16, float, ff_sine_128 [ 128]); -DECLARE_ALIGNED(16, float, ff_sine_256 [ 256]); -DECLARE_ALIGNED(16, float, ff_sine_512 [ 512]); -DECLARE_ALIGNED(16, float, ff_sine_1024[1024]); -DECLARE_ALIGNED(16, float, ff_sine_2048[2048]); -DECLARE_ALIGNED(16, float, ff_sine_4096[4096]); -float *ff_sine_windows[6] = { - ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096 -}; - -// Generate a sine window. -av_cold void ff_sine_window_init(float *window, int n) { - int i; - for(i = 0; i < n; i++) - window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n))); -} - -/** - * init MDCT or IMDCT computation. - */ -av_cold int ff_mdct_init(MDCTContext *s, int nbits, int inverse) -{ - int n, n4, i; - double alpha; - - memset(s, 0, sizeof(*s)); - n = 1 << nbits; - s->nbits = nbits; - s->n = n; - n4 = n >> 2; - s->tcos = av_malloc(n4 * sizeof(FFTSample)); - if (!s->tcos) - goto fail; - s->tsin = av_malloc(n4 * sizeof(FFTSample)); - if (!s->tsin) - goto fail; - - for(i=0;itcos[i] = -cos(alpha); - s->tsin[i] = -sin(alpha); - } - if (ff_fft_init(&s->fft, s->nbits - 2, inverse) < 0) - goto fail; - return 0; - fail: - av_freep(&s->tcos); - av_freep(&s->tsin); - return -1; -} - -/* complex multiplication: p = a * b */ -#define CMUL(pre, pim, are, aim, bre, bim) \ -{\ - FFTSample _are = (are);\ - FFTSample _aim = (aim);\ - FFTSample _bre = (bre);\ - FFTSample _bim = (bim);\ - (pre) = _are * _bre - _aim * _bim;\ - (pim) = _are * _bim + _aim * _bre;\ -} - -/** - * Compute the middle half of the inverse MDCT of size N = 2^nbits, - * thus excluding the parts that can be derived by symmetry - * @param output N/2 samples - * @param input N/2 samples - */ -void ff_imdct_half_c(MDCTContext *s, FFTSample *output, const FFTSample *input) -{ - int k, n8, n4, n2, n, j; - const uint16_t *revtab = s->fft.revtab; - const FFTSample *tcos = s->tcos; - const FFTSample *tsin = s->tsin; - const FFTSample *in1, *in2; - FFTComplex *z = (FFTComplex *)output; - - n = 1 << s->nbits; - n2 = n >> 1; - n4 = n >> 2; - n8 = n >> 3; - - /* pre rotation */ - in1 = input; - in2 = input + n2 - 1; - for(k = 0; k < n4; k++) { - j=revtab[k]; - CMUL(z[j].re, z[j].im, *in2, *in1, tcos[k], tsin[k]); - in1 += 2; - in2 -= 2; - } - ff_fft_calc(&s->fft, z); - - /* post rotation + reordering */ - output += n4; - for(k = 0; k < n8; k++) { - FFTSample r0, i0, r1, i1; - CMUL(r0, i1, z[n8-k-1].im, z[n8-k-1].re, tsin[n8-k-1], tcos[n8-k-1]); - CMUL(r1, i0, z[n8+k ].im, z[n8+k ].re, tsin[n8+k ], tcos[n8+k ]); - z[n8-k-1].re = r0; - z[n8-k-1].im = i0; - z[n8+k ].re = r1; - z[n8+k ].im = i1; - } -} - -/** - * Compute inverse MDCT of size N = 2^nbits - * @param output N samples - * @param input N/2 samples - */ -void ff_imdct_calc_c(MDCTContext *s, FFTSample *output, const FFTSample *input) -{ - int k; - int n = 1 << s->nbits; - int n2 = n >> 1; - int n4 = n >> 2; - - ff_imdct_half_c(s, output+n4, input); - - for(k = 0; k < n4; k++) { - output[k] = -output[n2-k-1]; - output[n-k-1] = output[n2+k]; - } -} - -/** - * Compute MDCT of size N = 2^nbits - * @param input N samples - * @param out N/2 samples - */ -void ff_mdct_calc(MDCTContext *s, FFTSample *out, const FFTSample *input) -{ - int i, j, n, n8, n4, n2, n3; - FFTSample re, im; - const uint16_t *revtab = s->fft.revtab; - const FFTSample *tcos = s->tcos; - const FFTSample *tsin = s->tsin; - FFTComplex *x = (FFTComplex *)out; - - n = 1 << s->nbits; - n2 = n >> 1; - n4 = n >> 2; - n8 = n >> 3; - n3 = 3 * n4; - - /* pre rotation */ - for(i=0;ifft, x); - - /* post rotation */ - for(i=0;itcos); - av_freep(&s->tsin); - ff_fft_end(&s->fft); -} -- cgit v1.2.3