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
23static void sbr_sum64x5_c(INTFLOAT *z)
24{
25    int k;
26    for (k = 0; k < 64; k++) {
27        INTFLOAT f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256];
28        z[k] = f;
29    }
30}
31
32static void sbr_qmf_deint_bfly_c(INTFLOAT *v, const INTFLOAT *src0, const INTFLOAT *src1)
33{
34    int i;
35    for (i = 0; i < 64; i++) {
36#if USE_FIXED
37        v[      i] = (int)(0x10U + src0[i] - src1[63 - i]) >> 5;
38        v[127 - i] = (int)(0x10U + src0[i] + src1[63 - i]) >> 5;
39#else
40        v[      i] = src0[i] - src1[63 - i];
41        v[127 - i] = src0[i] + src1[63 - i];
42#endif
43    }
44}
45
46static void sbr_hf_apply_noise_0(INTFLOAT (*Y)[2], const AAC_FLOAT *s_m,
47                                 const AAC_FLOAT *q_filt, int noise,
48                                 int kx, int m_max)
49{
50    sbr_hf_apply_noise(Y, s_m, q_filt, noise, (INTFLOAT)1.0, (INTFLOAT)0.0, m_max);
51}
52
53static void sbr_hf_apply_noise_1(INTFLOAT (*Y)[2], const AAC_FLOAT *s_m,
54                                 const AAC_FLOAT *q_filt, int noise,
55                                 int kx, int m_max)
56{
57    INTFLOAT phi_sign = 1 - 2 * (kx & 1);
58    sbr_hf_apply_noise(Y, s_m, q_filt, noise, (INTFLOAT)0.0, phi_sign, m_max);
59}
60
61static void sbr_hf_apply_noise_2(INTFLOAT (*Y)[2], const AAC_FLOAT *s_m,
62                                 const AAC_FLOAT *q_filt, int noise,
63                                 int kx, int m_max)
64{
65    sbr_hf_apply_noise(Y, s_m, q_filt, noise, (INTFLOAT)-1.0, (INTFLOAT)0.0, m_max);
66}
67
68static void sbr_hf_apply_noise_3(INTFLOAT (*Y)[2], const AAC_FLOAT *s_m,
69                                 const AAC_FLOAT *q_filt, int noise,
70                                 int kx, int m_max)
71{
72    INTFLOAT phi_sign = 1 - 2 * (kx & 1);
73    sbr_hf_apply_noise(Y, s_m, q_filt, noise, (INTFLOAT)0.0, -phi_sign, m_max);
74}
75
76av_cold void AAC_RENAME(ff_sbrdsp_init)(SBRDSPContext *s)
77{
78    s->sum64x5 = sbr_sum64x5_c;
79    s->sum_square = sbr_sum_square_c;
80    s->neg_odd_64 = sbr_neg_odd_64_c;
81    s->qmf_pre_shuffle = sbr_qmf_pre_shuffle_c;
82    s->qmf_post_shuffle = sbr_qmf_post_shuffle_c;
83    s->qmf_deint_neg = sbr_qmf_deint_neg_c;
84    s->qmf_deint_bfly = sbr_qmf_deint_bfly_c;
85    s->autocorrelate = sbr_autocorrelate_c;
86    s->hf_gen = sbr_hf_gen_c;
87    s->hf_g_filt = sbr_hf_g_filt_c;
88
89    s->hf_apply_noise[0] = sbr_hf_apply_noise_0;
90    s->hf_apply_noise[1] = sbr_hf_apply_noise_1;
91    s->hf_apply_noise[2] = sbr_hf_apply_noise_2;
92    s->hf_apply_noise[3] = sbr_hf_apply_noise_3;
93
94#if !USE_FIXED
95#if ARCH_ARM
96    ff_sbrdsp_init_arm(s);
97#elif ARCH_AARCH64
98    ff_sbrdsp_init_aarch64(s);
99#elif ARCH_X86
100    ff_sbrdsp_init_x86(s);
101#elif ARCH_MIPS
102    ff_sbrdsp_init_mips(s);
103#endif
104#endif /* !USE_FIXED */
105}
106