1/* 2 * AAC Spectral Band Replication decoding functions 3 * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl ) 4 * Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com> 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include "config.h" 24#include "libavutil/attributes.h" 25#include "libavutil/intfloat.h" 26#include "sbrdsp.h" 27 28static void sbr_sum64x5_c(float *z) 29{ 30 int k; 31 for (k = 0; k < 64; k++) { 32 float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256]; 33 z[k] = f; 34 } 35} 36 37static float sbr_sum_square_c(float (*x)[2], int n) 38{ 39 float sum0 = 0.0f, sum1 = 0.0f; 40 int i; 41 42 for (i = 0; i < n; i += 2) 43 { 44 sum0 += x[i + 0][0] * x[i + 0][0]; 45 sum1 += x[i + 0][1] * x[i + 0][1]; 46 sum0 += x[i + 1][0] * x[i + 1][0]; 47 sum1 += x[i + 1][1] * x[i + 1][1]; 48 } 49 50 return sum0 + sum1; 51} 52 53static void sbr_neg_odd_64_c(float *x) 54{ 55 union av_intfloat32 *xi = (union av_intfloat32*) x; 56 int i; 57 for (i = 1; i < 64; i += 4) { 58 xi[i + 0].i ^= 1U << 31; 59 xi[i + 2].i ^= 1U << 31; 60 } 61} 62 63static void sbr_qmf_pre_shuffle_c(float *z) 64{ 65 union av_intfloat32 *zi = (union av_intfloat32*) z; 66 int k; 67 zi[64].i = zi[0].i; 68 zi[65].i = zi[1].i; 69 for (k = 1; k < 31; k += 2) { 70 zi[64 + 2 * k + 0].i = zi[64 - k].i ^ (1U << 31); 71 zi[64 + 2 * k + 1].i = zi[ k + 1].i; 72 zi[64 + 2 * k + 2].i = zi[63 - k].i ^ (1U << 31); 73 zi[64 + 2 * k + 3].i = zi[ k + 2].i; 74 } 75 76 zi[64 + 2 * 31 + 0].i = zi[64 - 31].i ^ (1U << 31); 77 zi[64 + 2 * 31 + 1].i = zi[31 + 1].i; 78} 79 80static void sbr_qmf_post_shuffle_c(float W[32][2], const float *z) 81{ 82 const union av_intfloat32 *zi = (const union av_intfloat32*) z; 83 union av_intfloat32 *Wi = (union av_intfloat32*) W; 84 int k; 85 for (k = 0; k < 32; k += 2) { 86 Wi[2 * k + 0].i = zi[63 - k].i ^ (1U << 31); 87 Wi[2 * k + 1].i = zi[ k + 0].i; 88 Wi[2 * k + 2].i = zi[62 - k].i ^ (1U << 31); 89 Wi[2 * k + 3].i = zi[ k + 1].i; 90 } 91} 92 93static void sbr_qmf_deint_neg_c(float *v, const float *src) 94{ 95 const union av_intfloat32 *si = (const union av_intfloat32*)src; 96 union av_intfloat32 *vi = (union av_intfloat32*)v; 97 int i; 98 for (i = 0; i < 32; i++) { 99 vi[ i].i = si[63 - 2 * i ].i; 100 vi[63 - i].i = si[63 - 2 * i - 1].i ^ (1U << 31); 101 } 102} 103 104static void sbr_qmf_deint_bfly_c(float *v, const float *src0, const float *src1) 105{ 106 int i; 107 for (i = 0; i < 64; i++) { 108 v[ i] = src0[i] - src1[63 - i]; 109 v[127 - i] = src0[i] + src1[63 - i]; 110 } 111} 112 113 114#if 0 115 /* This code is slower because it multiplies memory accesses. 116 * It is left for educational purposes and because it may offer 117 * a better reference for writing arch-specific DSP functions. */ 118static av_always_inline void autocorrelate(const float x[40][2], 119 float phi[3][2][2], int lag) 120{ 121 int i; 122 float real_sum = 0.0f; 123 float imag_sum = 0.0f; 124 if (lag) { 125 for (i = 1; i < 38; i++) { 126 real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1]; 127 imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0]; 128 } 129 phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1]; 130 phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0]; 131 if (lag == 1) { 132 phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1]; 133 phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0]; 134 } 135 } else { 136 for (i = 1; i < 38; i++) { 137 real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1]; 138 } 139 phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1]; 140 phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1]; 141 } 142} 143 144static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2]) 145{ 146 autocorrelate(x, phi, 0); 147 autocorrelate(x, phi, 1); 148 autocorrelate(x, phi, 2); 149} 150#else 151static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2]) 152{ 153 float real_sum2 = x[0][0] * x[2][0] + x[0][1] * x[2][1]; 154 float imag_sum2 = x[0][0] * x[2][1] - x[0][1] * x[2][0]; 155 float real_sum1 = 0.0f, imag_sum1 = 0.0f, real_sum0 = 0.0f; 156 int i; 157 for (i = 1; i < 38; i++) { 158 real_sum0 += x[i][0] * x[i ][0] + x[i][1] * x[i ][1]; 159 real_sum1 += x[i][0] * x[i + 1][0] + x[i][1] * x[i + 1][1]; 160 imag_sum1 += x[i][0] * x[i + 1][1] - x[i][1] * x[i + 1][0]; 161 real_sum2 += x[i][0] * x[i + 2][0] + x[i][1] * x[i + 2][1]; 162 imag_sum2 += x[i][0] * x[i + 2][1] - x[i][1] * x[i + 2][0]; 163 } 164 phi[2 - 2][1][0] = real_sum2; 165 phi[2 - 2][1][1] = imag_sum2; 166 phi[2 ][1][0] = real_sum0 + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1]; 167 phi[1 ][0][0] = real_sum0 + x[38][0] * x[38][0] + x[38][1] * x[38][1]; 168 phi[2 - 1][1][0] = real_sum1 + x[ 0][0] * x[ 1][0] + x[ 0][1] * x[ 1][1]; 169 phi[2 - 1][1][1] = imag_sum1 + x[ 0][0] * x[ 1][1] - x[ 0][1] * x[ 1][0]; 170 phi[0 ][0][0] = real_sum1 + x[38][0] * x[39][0] + x[38][1] * x[39][1]; 171 phi[0 ][0][1] = imag_sum1 + x[38][0] * x[39][1] - x[38][1] * x[39][0]; 172#endif 173} 174 175static void sbr_hf_gen_c(float (*X_high)[2], const float (*X_low)[2], 176 const float alpha0[2], const float alpha1[2], 177 float bw, int start, int end) 178{ 179 float alpha[4]; 180 int i; 181 182 alpha[0] = alpha1[0] * bw * bw; 183 alpha[1] = alpha1[1] * bw * bw; 184 alpha[2] = alpha0[0] * bw; 185 alpha[3] = alpha0[1] * bw; 186 187 for (i = start; i < end; i++) { 188 X_high[i][0] = 189 X_low[i - 2][0] * alpha[0] - 190 X_low[i - 2][1] * alpha[1] + 191 X_low[i - 1][0] * alpha[2] - 192 X_low[i - 1][1] * alpha[3] + 193 X_low[i][0]; 194 X_high[i][1] = 195 X_low[i - 2][1] * alpha[0] + 196 X_low[i - 2][0] * alpha[1] + 197 X_low[i - 1][1] * alpha[2] + 198 X_low[i - 1][0] * alpha[3] + 199 X_low[i][1]; 200 } 201} 202 203static void sbr_hf_g_filt_c(float (*Y)[2], const float (*X_high)[40][2], 204 const float *g_filt, int m_max, intptr_t ixh) 205{ 206 int m; 207 208 for (m = 0; m < m_max; m++) { 209 Y[m][0] = X_high[m][ixh][0] * g_filt[m]; 210 Y[m][1] = X_high[m][ixh][1] * g_filt[m]; 211 } 212} 213 214static av_always_inline void sbr_hf_apply_noise(float (*Y)[2], 215 const float *s_m, 216 const float *q_filt, 217 int noise, 218 float phi_sign0, 219 float phi_sign1, 220 int m_max) 221{ 222 int m; 223 224 for (m = 0; m < m_max; m++) { 225 float y0 = Y[m][0]; 226 float y1 = Y[m][1]; 227 noise = (noise + 1) & 0x1ff; 228 if (s_m[m]) { 229 y0 += s_m[m] * phi_sign0; 230 y1 += s_m[m] * phi_sign1; 231 } else { 232 y0 += q_filt[m] * ff_sbr_noise_table[noise][0]; 233 y1 += q_filt[m] * ff_sbr_noise_table[noise][1]; 234 } 235 Y[m][0] = y0; 236 Y[m][1] = y1; 237 phi_sign1 = -phi_sign1; 238 } 239} 240 241static void sbr_hf_apply_noise_0(float (*Y)[2], const float *s_m, 242 const float *q_filt, int noise, 243 int kx, int m_max) 244{ 245 sbr_hf_apply_noise(Y, s_m, q_filt, noise, 1.0, 0.0, m_max); 246} 247 248static void sbr_hf_apply_noise_1(float (*Y)[2], const float *s_m, 249 const float *q_filt, int noise, 250 int kx, int m_max) 251{ 252 float phi_sign = 1 - 2 * (kx & 1); 253 sbr_hf_apply_noise(Y, s_m, q_filt, noise, 0.0, phi_sign, m_max); 254} 255 256static void sbr_hf_apply_noise_2(float (*Y)[2], const float *s_m, 257 const float *q_filt, int noise, 258 int kx, int m_max) 259{ 260 sbr_hf_apply_noise(Y, s_m, q_filt, noise, -1.0, 0.0, m_max); 261} 262 263static void sbr_hf_apply_noise_3(float (*Y)[2], const float *s_m, 264 const float *q_filt, int noise, 265 int kx, int m_max) 266{ 267 float phi_sign = 1 - 2 * (kx & 1); 268 sbr_hf_apply_noise(Y, s_m, q_filt, noise, 0.0, -phi_sign, m_max); 269} 270 271av_cold void ff_sbrdsp_init(SBRDSPContext *s) 272{ 273 s->sum64x5 = sbr_sum64x5_c; 274 s->sum_square = sbr_sum_square_c; 275 s->neg_odd_64 = sbr_neg_odd_64_c; 276 s->qmf_pre_shuffle = sbr_qmf_pre_shuffle_c; 277 s->qmf_post_shuffle = sbr_qmf_post_shuffle_c; 278 s->qmf_deint_neg = sbr_qmf_deint_neg_c; 279 s->qmf_deint_bfly = sbr_qmf_deint_bfly_c; 280 s->autocorrelate = sbr_autocorrelate_c; 281 s->hf_gen = sbr_hf_gen_c; 282 s->hf_g_filt = sbr_hf_g_filt_c; 283 284 s->hf_apply_noise[0] = sbr_hf_apply_noise_0; 285 s->hf_apply_noise[1] = sbr_hf_apply_noise_1; 286 s->hf_apply_noise[2] = sbr_hf_apply_noise_2; 287 s->hf_apply_noise[3] = sbr_hf_apply_noise_3; 288 289 if (ARCH_ARM) 290 ff_sbrdsp_init_arm(s); 291 if (ARCH_X86) 292 ff_sbrdsp_init_x86(s); 293 if (ARCH_MIPS) 294 ff_sbrdsp_init_mips(s); 295} 296