blob: a93b5f9c134d1a8a7b026cfa8d0304e99a857b1d
| 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 | #define USE_FIXED 0 |
| 24 | |
| 25 | #include "aac.h" |
| 26 | #include "config.h" |
| 27 | #include "libavutil/attributes.h" |
| 28 | #include "libavutil/intfloat.h" |
| 29 | #include "sbrdsp.h" |
| 30 | |
| 31 | static float sbr_sum_square_c(float (*x)[2], int n) |
| 32 | { |
| 33 | float sum0 = 0.0f, sum1 = 0.0f; |
| 34 | int i; |
| 35 | |
| 36 | for (i = 0; i < n; i += 2) |
| 37 | { |
| 38 | sum0 += x[i + 0][0] * x[i + 0][0]; |
| 39 | sum1 += x[i + 0][1] * x[i + 0][1]; |
| 40 | sum0 += x[i + 1][0] * x[i + 1][0]; |
| 41 | sum1 += x[i + 1][1] * x[i + 1][1]; |
| 42 | } |
| 43 | |
| 44 | return sum0 + sum1; |
| 45 | } |
| 46 | |
| 47 | static void sbr_neg_odd_64_c(float *x) |
| 48 | { |
| 49 | union av_intfloat32 *xi = (union av_intfloat32*) x; |
| 50 | int i; |
| 51 | for (i = 1; i < 64; i += 4) { |
| 52 | xi[i + 0].i ^= 1U << 31; |
| 53 | xi[i + 2].i ^= 1U << 31; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | static void sbr_qmf_pre_shuffle_c(float *z) |
| 58 | { |
| 59 | union av_intfloat32 *zi = (union av_intfloat32*) z; |
| 60 | int k; |
| 61 | zi[64].i = zi[0].i; |
| 62 | zi[65].i = zi[1].i; |
| 63 | for (k = 1; k < 31; k += 2) { |
| 64 | zi[64 + 2 * k + 0].i = zi[64 - k].i ^ (1U << 31); |
| 65 | zi[64 + 2 * k + 1].i = zi[ k + 1].i; |
| 66 | zi[64 + 2 * k + 2].i = zi[63 - k].i ^ (1U << 31); |
| 67 | zi[64 + 2 * k + 3].i = zi[ k + 2].i; |
| 68 | } |
| 69 | |
| 70 | zi[64 + 2 * 31 + 0].i = zi[64 - 31].i ^ (1U << 31); |
| 71 | zi[64 + 2 * 31 + 1].i = zi[31 + 1].i; |
| 72 | } |
| 73 | |
| 74 | static void sbr_qmf_post_shuffle_c(float W[32][2], const float *z) |
| 75 | { |
| 76 | const union av_intfloat32 *zi = (const union av_intfloat32*) z; |
| 77 | union av_intfloat32 *Wi = (union av_intfloat32*) W; |
| 78 | int k; |
| 79 | for (k = 0; k < 32; k += 2) { |
| 80 | Wi[2 * k + 0].i = zi[63 - k].i ^ (1U << 31); |
| 81 | Wi[2 * k + 1].i = zi[ k + 0].i; |
| 82 | Wi[2 * k + 2].i = zi[62 - k].i ^ (1U << 31); |
| 83 | Wi[2 * k + 3].i = zi[ k + 1].i; |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | static void sbr_qmf_deint_neg_c(float *v, const float *src) |
| 88 | { |
| 89 | const union av_intfloat32 *si = (const union av_intfloat32*)src; |
| 90 | union av_intfloat32 *vi = (union av_intfloat32*)v; |
| 91 | int i; |
| 92 | for (i = 0; i < 32; i++) { |
| 93 | vi[ i].i = si[63 - 2 * i ].i; |
| 94 | vi[63 - i].i = si[63 - 2 * i - 1].i ^ (1U << 31); |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | #if 0 |
| 99 | /* This code is slower because it multiplies memory accesses. |
| 100 | * It is left for educational purposes and because it may offer |
| 101 | * a better reference for writing arch-specific DSP functions. */ |
| 102 | static av_always_inline void autocorrelate(const float x[40][2], |
| 103 | float phi[3][2][2], int lag) |
| 104 | { |
| 105 | int i; |
| 106 | float real_sum = 0.0f; |
| 107 | float imag_sum = 0.0f; |
| 108 | if (lag) { |
| 109 | for (i = 1; i < 38; i++) { |
| 110 | real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1]; |
| 111 | imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0]; |
| 112 | } |
| 113 | phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1]; |
| 114 | phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0]; |
| 115 | if (lag == 1) { |
| 116 | phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1]; |
| 117 | phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0]; |
| 118 | } |
| 119 | } else { |
| 120 | for (i = 1; i < 38; i++) { |
| 121 | real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1]; |
| 122 | } |
| 123 | phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1]; |
| 124 | phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1]; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2]) |
| 129 | { |
| 130 | autocorrelate(x, phi, 0); |
| 131 | autocorrelate(x, phi, 1); |
| 132 | autocorrelate(x, phi, 2); |
| 133 | } |
| 134 | #else |
| 135 | static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2]) |
| 136 | { |
| 137 | float real_sum2 = x[0][0] * x[2][0] + x[0][1] * x[2][1]; |
| 138 | float imag_sum2 = x[0][0] * x[2][1] - x[0][1] * x[2][0]; |
| 139 | float real_sum1 = 0.0f, imag_sum1 = 0.0f, real_sum0 = 0.0f; |
| 140 | int i; |
| 141 | for (i = 1; i < 38; i++) { |
| 142 | real_sum0 += x[i][0] * x[i ][0] + x[i][1] * x[i ][1]; |
| 143 | real_sum1 += x[i][0] * x[i + 1][0] + x[i][1] * x[i + 1][1]; |
| 144 | imag_sum1 += x[i][0] * x[i + 1][1] - x[i][1] * x[i + 1][0]; |
| 145 | real_sum2 += x[i][0] * x[i + 2][0] + x[i][1] * x[i + 2][1]; |
| 146 | imag_sum2 += x[i][0] * x[i + 2][1] - x[i][1] * x[i + 2][0]; |
| 147 | } |
| 148 | phi[2 - 2][1][0] = real_sum2; |
| 149 | phi[2 - 2][1][1] = imag_sum2; |
| 150 | phi[2 ][1][0] = real_sum0 + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1]; |
| 151 | phi[1 ][0][0] = real_sum0 + x[38][0] * x[38][0] + x[38][1] * x[38][1]; |
| 152 | phi[2 - 1][1][0] = real_sum1 + x[ 0][0] * x[ 1][0] + x[ 0][1] * x[ 1][1]; |
| 153 | phi[2 - 1][1][1] = imag_sum1 + x[ 0][0] * x[ 1][1] - x[ 0][1] * x[ 1][0]; |
| 154 | phi[0 ][0][0] = real_sum1 + x[38][0] * x[39][0] + x[38][1] * x[39][1]; |
| 155 | phi[0 ][0][1] = imag_sum1 + x[38][0] * x[39][1] - x[38][1] * x[39][0]; |
| 156 | } |
| 157 | #endif |
| 158 | |
| 159 | static void sbr_hf_gen_c(float (*X_high)[2], const float (*X_low)[2], |
| 160 | const float alpha0[2], const float alpha1[2], |
| 161 | float bw, int start, int end) |
| 162 | { |
| 163 | float alpha[4]; |
| 164 | int i; |
| 165 | |
| 166 | alpha[0] = alpha1[0] * bw * bw; |
| 167 | alpha[1] = alpha1[1] * bw * bw; |
| 168 | alpha[2] = alpha0[0] * bw; |
| 169 | alpha[3] = alpha0[1] * bw; |
| 170 | |
| 171 | for (i = start; i < end; i++) { |
| 172 | X_high[i][0] = |
| 173 | X_low[i - 2][0] * alpha[0] - |
| 174 | X_low[i - 2][1] * alpha[1] + |
| 175 | X_low[i - 1][0] * alpha[2] - |
| 176 | X_low[i - 1][1] * alpha[3] + |
| 177 | X_low[i][0]; |
| 178 | X_high[i][1] = |
| 179 | X_low[i - 2][1] * alpha[0] + |
| 180 | X_low[i - 2][0] * alpha[1] + |
| 181 | X_low[i - 1][1] * alpha[2] + |
| 182 | X_low[i - 1][0] * alpha[3] + |
| 183 | X_low[i][1]; |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | static void sbr_hf_g_filt_c(float (*Y)[2], const float (*X_high)[40][2], |
| 188 | const float *g_filt, int m_max, intptr_t ixh) |
| 189 | { |
| 190 | int m; |
| 191 | |
| 192 | for (m = 0; m < m_max; m++) { |
| 193 | Y[m][0] = X_high[m][ixh][0] * g_filt[m]; |
| 194 | Y[m][1] = X_high[m][ixh][1] * g_filt[m]; |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | static av_always_inline void sbr_hf_apply_noise(float (*Y)[2], |
| 199 | const float *s_m, |
| 200 | const float *q_filt, |
| 201 | int noise, |
| 202 | float phi_sign0, |
| 203 | float phi_sign1, |
| 204 | int m_max) |
| 205 | { |
| 206 | int m; |
| 207 | |
| 208 | for (m = 0; m < m_max; m++) { |
| 209 | float y0 = Y[m][0]; |
| 210 | float y1 = Y[m][1]; |
| 211 | noise = (noise + 1) & 0x1ff; |
| 212 | if (s_m[m]) { |
| 213 | y0 += s_m[m] * phi_sign0; |
| 214 | y1 += s_m[m] * phi_sign1; |
| 215 | } else { |
| 216 | y0 += q_filt[m] * ff_sbr_noise_table[noise][0]; |
| 217 | y1 += q_filt[m] * ff_sbr_noise_table[noise][1]; |
| 218 | } |
| 219 | Y[m][0] = y0; |
| 220 | Y[m][1] = y1; |
| 221 | phi_sign1 = -phi_sign1; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | #include "sbrdsp_template.c" |
| 226 |