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
23 static void sbr_sum64x5_c(INTFLOAT *z)
26 for (k = 0; k < 64; k++) {
27 INTFLOAT f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256];
32 static void sbr_qmf_deint_bfly_c(INTFLOAT *v, const INTFLOAT *src0, const INTFLOAT *src1)
35 for (i = 0; i < 64; i++) {
36 v[ i] = AAC_SRA_R((src0[i] - src1[63 - i]), 5);
37 v[127 - i] = AAC_SRA_R((src0[i] + src1[63 - i]), 5);
41 static void sbr_hf_apply_noise_0(INTFLOAT (*Y)[2], const AAC_FLOAT *s_m,
42 const AAC_FLOAT *q_filt, int noise,
45 sbr_hf_apply_noise(Y, s_m, q_filt, noise, (INTFLOAT)1.0, (INTFLOAT)0.0, m_max);
48 static void sbr_hf_apply_noise_1(INTFLOAT (*Y)[2], const AAC_FLOAT *s_m,
49 const AAC_FLOAT *q_filt, int noise,
52 INTFLOAT phi_sign = 1 - 2 * (kx & 1);
53 sbr_hf_apply_noise(Y, s_m, q_filt, noise, (INTFLOAT)0.0, phi_sign, m_max);
56 static void sbr_hf_apply_noise_2(INTFLOAT (*Y)[2], const AAC_FLOAT *s_m,
57 const AAC_FLOAT *q_filt, int noise,
60 sbr_hf_apply_noise(Y, s_m, q_filt, noise, (INTFLOAT)-1.0, (INTFLOAT)0.0, m_max);
63 static void sbr_hf_apply_noise_3(INTFLOAT (*Y)[2], const AAC_FLOAT *s_m,
64 const AAC_FLOAT *q_filt, int noise,
67 INTFLOAT phi_sign = 1 - 2 * (kx & 1);
68 sbr_hf_apply_noise(Y, s_m, q_filt, noise, (INTFLOAT)0.0, -phi_sign, m_max);
71 av_cold void AAC_RENAME(ff_sbrdsp_init)(SBRDSPContext *s)
73 s->sum64x5 = sbr_sum64x5_c;
74 s->sum_square = sbr_sum_square_c;
75 s->neg_odd_64 = sbr_neg_odd_64_c;
76 s->qmf_pre_shuffle = sbr_qmf_pre_shuffle_c;
77 s->qmf_post_shuffle = sbr_qmf_post_shuffle_c;
78 s->qmf_deint_neg = sbr_qmf_deint_neg_c;
79 s->qmf_deint_bfly = sbr_qmf_deint_bfly_c;
80 s->autocorrelate = sbr_autocorrelate_c;
81 s->hf_gen = sbr_hf_gen_c;
82 s->hf_g_filt = sbr_hf_g_filt_c;
84 s->hf_apply_noise[0] = sbr_hf_apply_noise_0;
85 s->hf_apply_noise[1] = sbr_hf_apply_noise_1;
86 s->hf_apply_noise[2] = sbr_hf_apply_noise_2;
87 s->hf_apply_noise[3] = sbr_hf_apply_noise_3;
91 ff_sbrdsp_init_arm(s);
93 ff_sbrdsp_init_x86(s);
95 ff_sbrdsp_init_mips(s);
96 #endif /* !USE_FIXED */