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Diffstat (limited to 'libavcodec/imdct15.c')
-rw-r--r-- | libavcodec/imdct15.c | 274 |
1 files changed, 0 insertions, 274 deletions
diff --git a/libavcodec/imdct15.c b/libavcodec/imdct15.c deleted file mode 100644 index e02e9ce..0000000 --- a/libavcodec/imdct15.c +++ /dev/null @@ -1,274 +0,0 @@ -/* - * Copyright (c) 2013-2014 Mozilla Corporation - * - * This file is part of Libav. - * - * Libav 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. - * - * Libav 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 Libav; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * Celt non-power of 2 iMDCT - */ - -#include <float.h> -#include <math.h> -#include <stddef.h> - -#include "config.h" - -#include "libavutil/attributes.h" -#include "libavutil/common.h" - -#include "avfft.h" -#include "imdct15.h" -#include "opus.h" - -// minimal iMDCT size to make SIMD opts easier -#define CELT_MIN_IMDCT_SIZE 120 - -// complex c = a * b -#define CMUL3(cre, cim, are, aim, bre, bim) \ -do { \ - cre = are * bre - aim * bim; \ - cim = are * bim + aim * bre; \ -} while (0) - -#define CMUL(c, a, b) CMUL3((c).re, (c).im, (a).re, (a).im, (b).re, (b).im) - -// complex c = a * b -// d = a * conjugate(b) -#define CMUL2(c, d, a, b) \ -do { \ - float are = (a).re; \ - float aim = (a).im; \ - float bre = (b).re; \ - float bim = (b).im; \ - float rr = are * bre; \ - float ri = are * bim; \ - float ir = aim * bre; \ - float ii = aim * bim; \ - (c).re = rr - ii; \ - (c).im = ri + ir; \ - (d).re = rr + ii; \ - (d).im = -ri + ir; \ -} while (0) - -av_cold void ff_imdct15_uninit(IMDCT15Context **ps) -{ - IMDCT15Context *s = *ps; - int i; - - if (!s) - return; - - for (i = 0; i < FF_ARRAY_ELEMS(s->exptab); i++) - av_freep(&s->exptab[i]); - - av_freep(&s->twiddle_exptab); - - av_freep(&s->tmp); - - av_freep(ps); -} - -static void imdct15_half(IMDCT15Context *s, float *dst, const float *src, - ptrdiff_t stride, float scale); - -av_cold int ff_imdct15_init(IMDCT15Context **ps, int N) -{ - IMDCT15Context *s; - int len2 = 15 * (1 << N); - int len = 2 * len2; - int i, j; - - if (len2 > CELT_MAX_FRAME_SIZE || len2 < CELT_MIN_IMDCT_SIZE) - return AVERROR(EINVAL); - - s = av_mallocz(sizeof(*s)); - if (!s) - return AVERROR(ENOMEM); - - s->fft_n = N - 1; - s->len4 = len2 / 2; - s->len2 = len2; - - s->tmp = av_malloc(len * 2 * sizeof(*s->tmp)); - if (!s->tmp) - goto fail; - - s->twiddle_exptab = av_malloc(s->len4 * sizeof(*s->twiddle_exptab)); - if (!s->twiddle_exptab) - goto fail; - - for (i = 0; i < s->len4; i++) { - s->twiddle_exptab[i].re = cos(2 * M_PI * (i + 0.125 + s->len4) / len); - s->twiddle_exptab[i].im = sin(2 * M_PI * (i + 0.125 + s->len4) / len); - } - - for (i = 0; i < FF_ARRAY_ELEMS(s->exptab); i++) { - int N = 15 * (1 << i); - s->exptab[i] = av_malloc(sizeof(*s->exptab[i]) * FFMAX(N, 19)); - if (!s->exptab[i]) - goto fail; - - for (j = 0; j < N; j++) { - s->exptab[i][j].re = cos(2 * M_PI * j / N); - s->exptab[i][j].im = sin(2 * M_PI * j / N); - } - } - - // wrap around to simplify fft15 - for (j = 15; j < 19; j++) - s->exptab[0][j] = s->exptab[0][j - 15]; - - s->imdct_half = imdct15_half; - - if (ARCH_AARCH64) - ff_imdct15_init_aarch64(s); - - *ps = s; - - return 0; - -fail: - ff_imdct15_uninit(&s); - return AVERROR(ENOMEM); -} - -static void fft5(FFTComplex *out, const FFTComplex *in, ptrdiff_t stride) -{ - // [0] = exp(2 * i * pi / 5), [1] = exp(2 * i * pi * 2 / 5) - static const FFTComplex fact[] = { { 0.30901699437494745, 0.95105651629515353 }, - { -0.80901699437494734, 0.58778525229247325 } }; - - FFTComplex z[4][4]; - - CMUL2(z[0][0], z[0][3], in[1 * stride], fact[0]); - CMUL2(z[0][1], z[0][2], in[1 * stride], fact[1]); - CMUL2(z[1][0], z[1][3], in[2 * stride], fact[0]); - CMUL2(z[1][1], z[1][2], in[2 * stride], fact[1]); - CMUL2(z[2][0], z[2][3], in[3 * stride], fact[0]); - CMUL2(z[2][1], z[2][2], in[3 * stride], fact[1]); - CMUL2(z[3][0], z[3][3], in[4 * stride], fact[0]); - CMUL2(z[3][1], z[3][2], in[4 * stride], fact[1]); - - out[0].re = in[0].re + in[stride].re + in[2 * stride].re + in[3 * stride].re + in[4 * stride].re; - out[0].im = in[0].im + in[stride].im + in[2 * stride].im + in[3 * stride].im + in[4 * stride].im; - - out[1].re = in[0].re + z[0][0].re + z[1][1].re + z[2][2].re + z[3][3].re; - out[1].im = in[0].im + z[0][0].im + z[1][1].im + z[2][2].im + z[3][3].im; - - out[2].re = in[0].re + z[0][1].re + z[1][3].re + z[2][0].re + z[3][2].re; - out[2].im = in[0].im + z[0][1].im + z[1][3].im + z[2][0].im + z[3][2].im; - - out[3].re = in[0].re + z[0][2].re + z[1][0].re + z[2][3].re + z[3][1].re; - out[3].im = in[0].im + z[0][2].im + z[1][0].im + z[2][3].im + z[3][1].im; - - out[4].re = in[0].re + z[0][3].re + z[1][2].re + z[2][1].re + z[3][0].re; - out[4].im = in[0].im + z[0][3].im + z[1][2].im + z[2][1].im + z[3][0].im; -} - -static void fft15(IMDCT15Context *s, FFTComplex *out, const FFTComplex *in, - ptrdiff_t stride) -{ - const FFTComplex *exptab = s->exptab[0]; - FFTComplex tmp[5]; - FFTComplex tmp1[5]; - FFTComplex tmp2[5]; - int k; - - fft5(tmp, in, stride * 3); - fft5(tmp1, in + stride, stride * 3); - fft5(tmp2, in + 2 * stride, stride * 3); - - for (k = 0; k < 5; k++) { - FFTComplex t1, t2; - - CMUL(t1, tmp1[k], exptab[k]); - CMUL(t2, tmp2[k], exptab[2 * k]); - out[k].re = tmp[k].re + t1.re + t2.re; - out[k].im = tmp[k].im + t1.im + t2.im; - - CMUL(t1, tmp1[k], exptab[k + 5]); - CMUL(t2, tmp2[k], exptab[2 * (k + 5)]); - out[k + 5].re = tmp[k].re + t1.re + t2.re; - out[k + 5].im = tmp[k].im + t1.im + t2.im; - - CMUL(t1, tmp1[k], exptab[k + 10]); - CMUL(t2, tmp2[k], exptab[2 * k + 5]); - out[k + 10].re = tmp[k].re + t1.re + t2.re; - out[k + 10].im = tmp[k].im + t1.im + t2.im; - } -} - -/* - * FFT of the length 15 * (2^N) - */ -static void fft_calc(IMDCT15Context *s, FFTComplex *out, const FFTComplex *in, - int N, ptrdiff_t stride) -{ - if (N) { - const FFTComplex *exptab = s->exptab[N]; - const int len2 = 15 * (1 << (N - 1)); - int k; - - fft_calc(s, out, in, N - 1, stride * 2); - fft_calc(s, out + len2, in + stride, N - 1, stride * 2); - - for (k = 0; k < len2; k++) { - FFTComplex t; - - CMUL(t, out[len2 + k], exptab[k]); - - out[len2 + k].re = out[k].re - t.re; - out[len2 + k].im = out[k].im - t.im; - - out[k].re += t.re; - out[k].im += t.im; - } - } else - fft15(s, out, in, stride); -} - -static void imdct15_half(IMDCT15Context *s, float *dst, const float *src, - ptrdiff_t stride, float scale) -{ - FFTComplex *z = (FFTComplex *)dst; - const int len8 = s->len4 / 2; - const float *in1 = src; - const float *in2 = src + (s->len2 - 1) * stride; - int i; - - for (i = 0; i < s->len4; i++) { - FFTComplex tmp = { *in2, *in1 }; - CMUL(s->tmp[i], tmp, s->twiddle_exptab[i]); - in1 += 2 * stride; - in2 -= 2 * stride; - } - - fft_calc(s, z, s->tmp, s->fft_n, 1); - - for (i = 0; i < len8; i++) { - float r0, i0, r1, i1; - - CMUL3(r0, i1, z[len8 - i - 1].im, z[len8 - i - 1].re, s->twiddle_exptab[len8 - i - 1].im, s->twiddle_exptab[len8 - i - 1].re); - CMUL3(r1, i0, z[len8 + i].im, z[len8 + i].re, s->twiddle_exptab[len8 + i].im, s->twiddle_exptab[len8 + i].re); - z[len8 - i - 1].re = scale * r0; - z[len8 - i - 1].im = scale * i0; - z[len8 + i].re = scale * r1; - z[len8 + i].im = scale * i1; - } -} |