X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;ds=sidebyside;f=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fliba52%2Fimdct.c;fp=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fliba52%2Fimdct.c;h=7a1690b63a88fe0e03d7fef19bb274781fa2b1e8;hb=16b3beced25134bef064705568ecb893a6be4e79;hp=0000000000000000000000000000000000000000;hpb=5a1d028f56182922addfed8f1f1c28fdde12756c;p=synfig.git diff --git a/synfig-core/trunk/src/modules/mod_libavcodec/libavcodec/liba52/imdct.c b/synfig-core/trunk/src/modules/mod_libavcodec/libavcodec/liba52/imdct.c new file mode 100644 index 0000000..7a1690b --- /dev/null +++ b/synfig-core/trunk/src/modules/mod_libavcodec/libavcodec/liba52/imdct.c @@ -0,0 +1,411 @@ +/* + * imdct.c + * Copyright (C) 2000-2003 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * The ifft algorithms in this file have been largely inspired by Dan + * Bernstein's work, djbfft, available at http://cr.yp.to/djbfft.html + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "a52.h" +#include "a52_internal.h" +#include "mm_accel.h" + +typedef struct complex_s { + sample_t real; + sample_t imag; +} complex_t; + +static uint8_t fftorder[] = { + 0,128, 64,192, 32,160,224, 96, 16,144, 80,208,240,112, 48,176, + 8,136, 72,200, 40,168,232,104,248,120, 56,184, 24,152,216, 88, + 4,132, 68,196, 36,164,228,100, 20,148, 84,212,244,116, 52,180, + 252,124, 60,188, 28,156,220, 92, 12,140, 76,204,236,108, 44,172, + 2,130, 66,194, 34,162,226, 98, 18,146, 82,210,242,114, 50,178, + 10,138, 74,202, 42,170,234,106,250,122, 58,186, 26,154,218, 90, + 254,126, 62,190, 30,158,222, 94, 14,142, 78,206,238,110, 46,174, + 6,134, 70,198, 38,166,230,102,246,118, 54,182, 22,150,214, 86 +}; + +/* Root values for IFFT */ +static sample_t roots16[3]; +static sample_t roots32[7]; +static sample_t roots64[15]; +static sample_t roots128[31]; + +/* Twiddle factors for IMDCT */ +static complex_t pre1[128]; +static complex_t post1[64]; +static complex_t pre2[64]; +static complex_t post2[32]; + +static sample_t a52_imdct_window[256]; + +static void (* ifft128) (complex_t * buf); +static void (* ifft64) (complex_t * buf); + +static inline void ifft2 (complex_t * buf) +{ + sample_t r, i; + + r = buf[0].real; + i = buf[0].imag; + buf[0].real += buf[1].real; + buf[0].imag += buf[1].imag; + buf[1].real = r - buf[1].real; + buf[1].imag = i - buf[1].imag; +} + +static inline void ifft4 (complex_t * buf) +{ + sample_t tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8; + + tmp1 = buf[0].real + buf[1].real; + tmp2 = buf[3].real + buf[2].real; + tmp3 = buf[0].imag + buf[1].imag; + tmp4 = buf[2].imag + buf[3].imag; + tmp5 = buf[0].real - buf[1].real; + tmp6 = buf[0].imag - buf[1].imag; + tmp7 = buf[2].imag - buf[3].imag; + tmp8 = buf[3].real - buf[2].real; + + buf[0].real = tmp1 + tmp2; + buf[0].imag = tmp3 + tmp4; + buf[2].real = tmp1 - tmp2; + buf[2].imag = tmp3 - tmp4; + buf[1].real = tmp5 + tmp7; + buf[1].imag = tmp6 + tmp8; + buf[3].real = tmp5 - tmp7; + buf[3].imag = tmp6 - tmp8; +} + +/* basic radix-2 ifft butterfly */ + +#define BUTTERFLY_0(t0,t1,W0,W1,d0,d1) do { \ + t0 = MUL (W1, d1) + MUL (W0, d0); \ + t1 = MUL (W0, d1) - MUL (W1, d0); \ +} while (0) + +/* radix-2 ifft butterfly with bias */ + +#define BUTTERFLY_B(t0,t1,W0,W1,d0,d1) do { \ + t0 = BIAS (MUL (d1, W1) + MUL (d0, W0)); \ + t1 = BIAS (MUL (d1, W0) - MUL (d0, W1)); \ +} while (0) + +/* the basic split-radix ifft butterfly */ + +#define BUTTERFLY(a0,a1,a2,a3,wr,wi) do { \ + BUTTERFLY_0 (tmp5, tmp6, wr, wi, a2.real, a2.imag); \ + BUTTERFLY_0 (tmp8, tmp7, wr, wi, a3.imag, a3.real); \ + tmp1 = tmp5 + tmp7; \ + tmp2 = tmp6 + tmp8; \ + tmp3 = tmp6 - tmp8; \ + tmp4 = tmp7 - tmp5; \ + a2.real = a0.real - tmp1; \ + a2.imag = a0.imag - tmp2; \ + a3.real = a1.real - tmp3; \ + a3.imag = a1.imag - tmp4; \ + a0.real += tmp1; \ + a0.imag += tmp2; \ + a1.real += tmp3; \ + a1.imag += tmp4; \ +} while (0) + +/* split-radix ifft butterfly, specialized for wr=1 wi=0 */ + +#define BUTTERFLY_ZERO(a0,a1,a2,a3) do { \ + tmp1 = a2.real + a3.real; \ + tmp2 = a2.imag + a3.imag; \ + tmp3 = a2.imag - a3.imag; \ + tmp4 = a3.real - a2.real; \ + a2.real = a0.real - tmp1; \ + a2.imag = a0.imag - tmp2; \ + a3.real = a1.real - tmp3; \ + a3.imag = a1.imag - tmp4; \ + a0.real += tmp1; \ + a0.imag += tmp2; \ + a1.real += tmp3; \ + a1.imag += tmp4; \ +} while (0) + +/* split-radix ifft butterfly, specialized for wr=wi */ + +#define BUTTERFLY_HALF(a0,a1,a2,a3,w) do { \ + tmp5 = MUL (a2.real + a2.imag, w); \ + tmp6 = MUL (a2.imag - a2.real, w); \ + tmp7 = MUL (a3.real - a3.imag, w); \ + tmp8 = MUL (a3.imag + a3.real, w); \ + tmp1 = tmp5 + tmp7; \ + tmp2 = tmp6 + tmp8; \ + tmp3 = tmp6 - tmp8; \ + tmp4 = tmp7 - tmp5; \ + a2.real = a0.real - tmp1; \ + a2.imag = a0.imag - tmp2; \ + a3.real = a1.real - tmp3; \ + a3.imag = a1.imag - tmp4; \ + a0.real += tmp1; \ + a0.imag += tmp2; \ + a1.real += tmp3; \ + a1.imag += tmp4; \ +} while (0) + +static inline void ifft8 (complex_t * buf) +{ + sample_t tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8; + + ifft4 (buf); + ifft2 (buf + 4); + ifft2 (buf + 6); + BUTTERFLY_ZERO (buf[0], buf[2], buf[4], buf[6]); + BUTTERFLY_HALF (buf[1], buf[3], buf[5], buf[7], roots16[1]); +} + +static void ifft_pass (complex_t * buf, sample_t * weight, int n) +{ + complex_t * buf1; + complex_t * buf2; + complex_t * buf3; + sample_t tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8; + int i; + + buf++; + buf1 = buf + n; + buf2 = buf + 2 * n; + buf3 = buf + 3 * n; + + BUTTERFLY_ZERO (buf[-1], buf1[-1], buf2[-1], buf3[-1]); + + i = n - 1; + + do { + BUTTERFLY (buf[0], buf1[0], buf2[0], buf3[0], + weight[0], weight[2*i-n]); + buf++; + buf1++; + buf2++; + buf3++; + weight++; + } while (--i); +} + +static void ifft16 (complex_t * buf) +{ + ifft8 (buf); + ifft4 (buf + 8); + ifft4 (buf + 12); + ifft_pass (buf, roots16, 4); +} + +static void ifft32 (complex_t * buf) +{ + ifft16 (buf); + ifft8 (buf + 16); + ifft8 (buf + 24); + ifft_pass (buf, roots32, 8); +} + +static void ifft64_c (complex_t * buf) +{ + ifft32 (buf); + ifft16 (buf + 32); + ifft16 (buf + 48); + ifft_pass (buf, roots64, 16); +} + +static void ifft128_c (complex_t * buf) +{ + ifft32 (buf); + ifft16 (buf + 32); + ifft16 (buf + 48); + ifft_pass (buf, roots64, 16); + + ifft32 (buf + 64); + ifft32 (buf + 96); + ifft_pass (buf, roots128, 32); +} + +void a52_imdct_512 (sample_t * data, sample_t * delay, sample_t bias) +{ + int i, k; + sample_t t_r, t_i, a_r, a_i, b_r, b_i, w_1, w_2; + const sample_t * window = a52_imdct_window; + complex_t buf[128]; + + for (i = 0; i < 128; i++) { + k = fftorder[i]; + t_r = pre1[i].real; + t_i = pre1[i].imag; + BUTTERFLY_0 (buf[i].real, buf[i].imag, t_r, t_i, data[k], data[255-k]); + } + + ifft128 (buf); + + /* Post IFFT complex multiply plus IFFT complex conjugate*/ + /* Window and convert to real valued signal */ + for (i = 0; i < 64; i++) { + /* y[n] = z[n] * (xcos1[n] + j * xsin1[n]) ; */ + t_r = post1[i].real; + t_i = post1[i].imag; + BUTTERFLY_0 (a_r, a_i, t_i, t_r, buf[i].imag, buf[i].real); + BUTTERFLY_0 (b_r, b_i, t_r, t_i, buf[127-i].imag, buf[127-i].real); + + w_1 = window[2*i]; + w_2 = window[255-2*i]; + BUTTERFLY_B (data[255-2*i], data[2*i], w_2, w_1, a_r, delay[2*i]); + delay[2*i] = a_i; + + w_1 = window[2*i+1]; + w_2 = window[254-2*i]; + BUTTERFLY_B (data[2*i+1], data[254-2*i], w_1, w_2, b_r, delay[2*i+1]); + delay[2*i+1] = b_i; + } +} + +void a52_imdct_256 (sample_t * data, sample_t * delay, sample_t bias) +{ + int i, k; + sample_t t_r, t_i, a_r, a_i, b_r, b_i, c_r, c_i, d_r, d_i, w_1, w_2; + const sample_t * window = a52_imdct_window; + complex_t buf1[64], buf2[64]; + + /* Pre IFFT complex multiply plus IFFT cmplx conjugate */ + for (i = 0; i < 64; i++) { + k = fftorder[i]; + t_r = pre2[i].real; + t_i = pre2[i].imag; + BUTTERFLY_0 (buf1[i].real, buf1[i].imag, t_r, t_i, data[k], data[254-k]); + BUTTERFLY_0 (buf2[i].real, buf2[i].imag, t_r, t_i, data[k+1], data[255-k]); + } + + ifft64 (buf1); + ifft64 (buf2); + + /* Post IFFT complex multiply */ + /* Window and convert to real valued signal */ + for (i = 0; i < 32; i++) { + /* y1[n] = z1[n] * (xcos2[n] + j * xs in2[n]) ; */ + t_r = post2[i].real; + t_i = post2[i].imag; + BUTTERFLY_0 (a_r, a_i, t_i, t_r, buf1[i].imag, buf1[i].real); + BUTTERFLY_0 (b_r, b_i, t_r, t_i, buf1[63-i].imag, buf1[63-i].real); + BUTTERFLY_0 (c_r, c_i, t_i, t_r, buf2[i].imag, buf2[i].real); + BUTTERFLY_0 (d_r, d_i, t_r, t_i, buf2[63-i].imag, buf2[63-i].real); + + w_1 = window[2*i]; + w_2 = window[255-2*i]; + BUTTERFLY_B (data[255-2*i], data[2*i], w_2, w_1, a_r, delay[2*i]); + delay[2*i] = c_i; + + w_1 = window[128+2*i]; + w_2 = window[127-2*i]; + BUTTERFLY_B (data[128+2*i], data[127-2*i], w_1, w_2, a_i, delay[127-2*i]); + delay[127-2*i] = c_r; + + w_1 = window[2*i+1]; + w_2 = window[254-2*i]; + BUTTERFLY_B (data[254-2*i], data[2*i+1], w_2, w_1, b_i, delay[2*i+1]); + delay[2*i+1] = d_r; + + w_1 = window[129+2*i]; + w_2 = window[126-2*i]; + BUTTERFLY_B (data[129+2*i], data[126-2*i], w_1, w_2, b_r, delay[126-2*i]); + delay[126-2*i] = d_i; + } +} + +static double besselI0 (double x) +{ + double bessel = 1; + int i = 100; + + do + bessel = bessel * x / (i * i) + 1; + while (--i); + return bessel; +} + +void a52_imdct_init (uint32_t mm_accel) +{ + int i, k; + double sum; + double local_imdct_window[256]; + + /* compute imdct window - kaiser-bessel derived window, alpha = 5.0 */ + sum = 0; + for (i = 0; i < 256; i++) { + sum += besselI0 (i * (256 - i) * (5 * M_PI / 256) * (5 * M_PI / 256)); + local_imdct_window[i] = sum; + } + sum++; + for (i = 0; i < 256; i++) + a52_imdct_window[i] = SAMPLE (sqrt (local_imdct_window[i] / sum)); + + for (i = 0; i < 3; i++) + roots16[i] = SAMPLE (cos ((M_PI / 8) * (i + 1))); + + for (i = 0; i < 7; i++) + roots32[i] = SAMPLE (cos ((M_PI / 16) * (i + 1))); + + for (i = 0; i < 15; i++) + roots64[i] = SAMPLE (cos ((M_PI / 32) * (i + 1))); + + for (i = 0; i < 31; i++) + roots128[i] = SAMPLE (cos ((M_PI / 64) * (i + 1))); + + for (i = 0; i < 64; i++) { + k = fftorder[i] / 2 + 64; + pre1[i].real = SAMPLE (cos ((M_PI / 256) * (k - 0.25))); + pre1[i].imag = SAMPLE (sin ((M_PI / 256) * (k - 0.25))); + } + + for (i = 64; i < 128; i++) { + k = fftorder[i] / 2 + 64; + pre1[i].real = SAMPLE (-cos ((M_PI / 256) * (k - 0.25))); + pre1[i].imag = SAMPLE (-sin ((M_PI / 256) * (k - 0.25))); + } + + for (i = 0; i < 64; i++) { + post1[i].real = SAMPLE (cos ((M_PI / 256) * (i + 0.5))); + post1[i].imag = SAMPLE (sin ((M_PI / 256) * (i + 0.5))); + } + + for (i = 0; i < 64; i++) { + k = fftorder[i] / 4; + pre2[i].real = SAMPLE (cos ((M_PI / 128) * (k - 0.25))); + pre2[i].imag = SAMPLE (sin ((M_PI / 128) * (k - 0.25))); + } + + for (i = 0; i < 32; i++) { + post2[i].real = SAMPLE (cos ((M_PI / 128) * (i + 0.5))); + post2[i].imag = SAMPLE (sin ((M_PI / 128) * (i + 0.5))); + } + +#ifdef LIBA52_DJBFFT + if (mm_accel & MM_ACCEL_DJBFFT) { + ifft128 = (void (*) (complex_t *)) fftc4_un128; + ifft64 = (void (*) (complex_t *)) fftc4_un64; + } else +#endif + { + ifft128 = ifft128_c; + ifft64 = ifft64_c; + } +}