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>
6 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/attributes.h"
25 #include "libavutil/intfloat.h"
28 static void sbr_sum64x5_c(float *z)
31 for (k = 0; k < 64; k++) {
32 float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256];
37 static float sbr_sum_square_c(float (*x)[2], int n)
39 float sum0 = 0.0f, sum1 = 0.0f;
42 for (i = 0; i < n; i += 2)
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];
53 static void sbr_neg_odd_64_c(float *x)
55 union av_intfloat32 *xi = (union av_intfloat32*) x;
57 for (i = 1; i < 64; i += 4) {
58 xi[i + 0].i ^= 1U << 31;
59 xi[i + 2].i ^= 1U << 31;
63 static void sbr_qmf_pre_shuffle_c(float *z)
65 union av_intfloat32 *zi = (union av_intfloat32*) z;
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;
76 zi[64 + 2 * 31 + 0].i = zi[64 - 31].i ^ (1U << 31);
77 zi[64 + 2 * 31 + 1].i = zi[31 + 1].i;
80 static void sbr_qmf_post_shuffle_c(float W[32][2], const float *z)
82 const union av_intfloat32 *zi = (const union av_intfloat32*) z;
83 union av_intfloat32 *Wi = (union av_intfloat32*) W;
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;
93 static void sbr_qmf_deint_neg_c(float *v, const float *src)
95 const union av_intfloat32 *si = (const union av_intfloat32*)src;
96 union av_intfloat32 *vi = (union av_intfloat32*)v;
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);
104 static void sbr_qmf_deint_bfly_c(float *v, const float *src0, const float *src1)
107 for (i = 0; i < 64; i++) {
108 v[ i] = src0[i] - src1[63 - i];
109 v[127 - i] = src0[i] + src1[63 - i];
113 static av_always_inline void autocorrelate(const float x[40][2],
114 float phi[3][2][2], int lag)
117 float real_sum = 0.0f;
118 float imag_sum = 0.0f;
120 for (i = 1; i < 38; i++) {
121 real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1];
122 imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0];
124 phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1];
125 phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0];
127 phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1];
128 phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0];
131 for (i = 1; i < 38; i++) {
132 real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1];
134 phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
135 phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1];
139 static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2])
142 /* This code is slower because it multiplies memory accesses.
143 * It is left for educational purposes and because it may offer
144 * a better reference for writing arch-specific DSP functions. */
145 autocorrelate(x, phi, 0);
146 autocorrelate(x, phi, 1);
147 autocorrelate(x, phi, 2);
149 float real_sum2 = x[0][0] * x[2][0] + x[0][1] * x[2][1];
150 float imag_sum2 = x[0][0] * x[2][1] - x[0][1] * x[2][0];
151 float real_sum1 = 0.0f, imag_sum1 = 0.0f, real_sum0 = 0.0f;
153 for (i = 1; i < 38; i++) {
154 real_sum0 += x[i][0] * x[i ][0] + x[i][1] * x[i ][1];
155 real_sum1 += x[i][0] * x[i + 1][0] + x[i][1] * x[i + 1][1];
156 imag_sum1 += x[i][0] * x[i + 1][1] - x[i][1] * x[i + 1][0];
157 real_sum2 += x[i][0] * x[i + 2][0] + x[i][1] * x[i + 2][1];
158 imag_sum2 += x[i][0] * x[i + 2][1] - x[i][1] * x[i + 2][0];
160 phi[2 - 2][1][0] = real_sum2;
161 phi[2 - 2][1][1] = imag_sum2;
162 phi[2 ][1][0] = real_sum0 + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
163 phi[1 ][0][0] = real_sum0 + x[38][0] * x[38][0] + x[38][1] * x[38][1];
164 phi[2 - 1][1][0] = real_sum1 + x[ 0][0] * x[ 1][0] + x[ 0][1] * x[ 1][1];
165 phi[2 - 1][1][1] = imag_sum1 + x[ 0][0] * x[ 1][1] - x[ 0][1] * x[ 1][0];
166 phi[0 ][0][0] = real_sum1 + x[38][0] * x[39][0] + x[38][1] * x[39][1];
167 phi[0 ][0][1] = imag_sum1 + x[38][0] * x[39][1] - x[38][1] * x[39][0];
171 static void sbr_hf_gen_c(float (*X_high)[2], const float (*X_low)[2],
172 const float alpha0[2], const float alpha1[2],
173 float bw, int start, int end)
178 alpha[0] = alpha1[0] * bw * bw;
179 alpha[1] = alpha1[1] * bw * bw;
180 alpha[2] = alpha0[0] * bw;
181 alpha[3] = alpha0[1] * bw;
183 for (i = start; i < end; i++) {
185 X_low[i - 2][0] * alpha[0] -
186 X_low[i - 2][1] * alpha[1] +
187 X_low[i - 1][0] * alpha[2] -
188 X_low[i - 1][1] * alpha[3] +
191 X_low[i - 2][1] * alpha[0] +
192 X_low[i - 2][0] * alpha[1] +
193 X_low[i - 1][1] * alpha[2] +
194 X_low[i - 1][0] * alpha[3] +
199 static void sbr_hf_g_filt_c(float (*Y)[2], const float (*X_high)[40][2],
200 const float *g_filt, int m_max, intptr_t ixh)
204 for (m = 0; m < m_max; m++) {
205 Y[m][0] = X_high[m][ixh][0] * g_filt[m];
206 Y[m][1] = X_high[m][ixh][1] * g_filt[m];
210 static av_always_inline void sbr_hf_apply_noise(float (*Y)[2],
220 for (m = 0; m < m_max; m++) {
223 noise = (noise + 1) & 0x1ff;
225 y0 += s_m[m] * phi_sign0;
226 y1 += s_m[m] * phi_sign1;
228 y0 += q_filt[m] * ff_sbr_noise_table[noise][0];
229 y1 += q_filt[m] * ff_sbr_noise_table[noise][1];
233 phi_sign1 = -phi_sign1;
237 static void sbr_hf_apply_noise_0(float (*Y)[2], const float *s_m,
238 const float *q_filt, int noise,
241 sbr_hf_apply_noise(Y, s_m, q_filt, noise, 1.0, 0.0, m_max);
244 static void sbr_hf_apply_noise_1(float (*Y)[2], const float *s_m,
245 const float *q_filt, int noise,
248 float phi_sign = 1 - 2 * (kx & 1);
249 sbr_hf_apply_noise(Y, s_m, q_filt, noise, 0.0, phi_sign, m_max);
252 static void sbr_hf_apply_noise_2(float (*Y)[2], const float *s_m,
253 const float *q_filt, int noise,
256 sbr_hf_apply_noise(Y, s_m, q_filt, noise, -1.0, 0.0, m_max);
259 static void sbr_hf_apply_noise_3(float (*Y)[2], const float *s_m,
260 const float *q_filt, int noise,
263 float phi_sign = 1 - 2 * (kx & 1);
264 sbr_hf_apply_noise(Y, s_m, q_filt, noise, 0.0, -phi_sign, m_max);
267 av_cold void ff_sbrdsp_init(SBRDSPContext *s)
269 s->sum64x5 = sbr_sum64x5_c;
270 s->sum_square = sbr_sum_square_c;
271 s->neg_odd_64 = sbr_neg_odd_64_c;
272 s->qmf_pre_shuffle = sbr_qmf_pre_shuffle_c;
273 s->qmf_post_shuffle = sbr_qmf_post_shuffle_c;
274 s->qmf_deint_neg = sbr_qmf_deint_neg_c;
275 s->qmf_deint_bfly = sbr_qmf_deint_bfly_c;
276 s->autocorrelate = sbr_autocorrelate_c;
277 s->hf_gen = sbr_hf_gen_c;
278 s->hf_g_filt = sbr_hf_g_filt_c;
280 s->hf_apply_noise[0] = sbr_hf_apply_noise_0;
281 s->hf_apply_noise[1] = sbr_hf_apply_noise_1;
282 s->hf_apply_noise[2] = sbr_hf_apply_noise_2;
283 s->hf_apply_noise[3] = sbr_hf_apply_noise_3;
286 ff_sbrdsp_init_arm(s);
288 ff_sbrdsp_init_x86(s);
290 ff_sbrdsp_init_mips(s);