1 /******************************************************************************
2 * *
3 * Copyright (C) 2018 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 *****************************************************************************
18 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
19 */
20 #include "ixheaacd_sbr_common.h"
21 #include "ixheaacd_type_def.h"
22
23 #include "ixheaacd_constants.h"
24 #include "ixheaacd_basic_ops32.h"
25 #include "ixheaacd_basic_ops16.h"
26 #include "ixheaacd_basic_ops40.h"
27 #include "ixheaacd_basic_ops.h"
28 #include "ixheaacd_common_rom.h"
29 #include "ixheaacd_dsp_fft32x32s.h"
30 #include "ixheaacd_intrinsics.h"
31
32 #include "ixheaacd_basic_op.h"
33
ixheaacd_inv_dit_fft_8pt_dec(WORD32 * y,WORD32 * real,WORD32 * imag)34 VOID ixheaacd_inv_dit_fft_8pt_dec(WORD32 *y, WORD32 *real, WORD32 *imag) {
35 WORD32 a0, a1, a2, a3, a00, a10, a20, a30;
36 WORD32 vr, vi;
37
38 WORD32 x[16];
39
40 a00 = ixheaacd_add32_sat(y[0], y[8]);
41 a0 = ixheaacd_sub32_sat(y[0], y[8]);
42
43 a20 = ixheaacd_add32_sat(y[1], y[9]);
44 a3 = ixheaacd_sub32_sat(y[1], y[9]);
45
46 a10 = ixheaacd_add32_sat(y[4], y[12]);
47 a2 = ixheaacd_sub32_sat(y[4], y[12]);
48
49 a30 = ixheaacd_add32_sat(y[5], y[13]);
50 a1 = ixheaacd_sub32_sat(y[5], y[13]);
51
52 x[0] = ixheaacd_add32_sat(a00, a10);
53 x[4] = ixheaacd_sub32_sat(a00, a10);
54 x[1] = ixheaacd_add32_sat(a20, a30);
55 x[5] = ixheaacd_sub32_sat(a20, a30);
56
57 x[2] = ixheaacd_sub32_sat(a0, a1);
58 x[6] = ixheaacd_add32_sat(a0, a1);
59 x[3] = ixheaacd_add32_sat(a3, a2);
60 x[7] = ixheaacd_sub32_sat(a3, a2);
61
62 a00 = ixheaacd_add32_sat(y[2], y[10]);
63 a0 = ixheaacd_sub32_sat(y[2], y[10]);
64
65 a20 = ixheaacd_add32_sat(y[3], y[11]);
66 a3 = ixheaacd_sub32_sat(y[3], y[11]);
67
68 a10 = ixheaacd_add32_sat(y[6], y[14]);
69 a2 = ixheaacd_sub32_sat(y[6], y[14]);
70
71 a30 = ixheaacd_add32_sat(y[7], y[15]);
72 a1 = ixheaacd_sub32_sat(y[7], y[15]);
73
74 x[8] = ixheaacd_add32_sat(a00, a10);
75 x[12] = ixheaacd_sub32_sat(a00, a10);
76 x[9] = ixheaacd_add32_sat(a20, a30);
77 x[13] = ixheaacd_sub32_sat(a20, a30);
78
79 x[10] = ixheaacd_sub32_sat(a0, a1);
80 x[14] = ixheaacd_add32_sat(a0, a1);
81 x[11] = ixheaacd_add32_sat(a3, a2);
82 x[15] = ixheaacd_sub32_sat(a3, a2);
83
84 real[0] = ixheaacd_add32_sat(x[0], x[8]);
85 imag[0] = ixheaacd_add32_sat(x[1], x[9]);
86 a00 = ixheaacd_sub32_sat(x[0], x[8]);
87 a10 = ixheaacd_sub32_sat(x[1], x[9]);
88
89 a0 = ixheaacd_sub32_sat(x[4], x[13]);
90 a1 = ixheaacd_add32_sat(x[5], x[12]);
91
92 real[4] = ixheaacd_add32_sat(x[4], x[13]);
93 imag[4] = ixheaacd_sub32_sat(x[5], x[12]);
94
95 vr = ixheaacd_mult32x16in32_shl_sat(ixheaacd_sub32_sat(x[10], x[11]), 0x5A82);
96 vi = ixheaacd_mult32x16in32_shl_sat(ixheaacd_add32_sat(x[10], x[11]), 0x5A82);
97
98 real[1] = ixheaacd_add32_sat(x[2], vr);
99 imag[1] = ixheaacd_add32_sat(x[3], vi);
100
101 a2 = ixheaacd_sub32_sat(x[2], vr);
102 a3 = ixheaacd_sub32_sat(x[3], vi);
103
104 real[2] = ixheaacd_add32_sat(a0, a2);
105 imag[2] = ixheaacd_add32_sat(a1, a3);
106 vr = ixheaacd_mult32x16in32_shl_sat(ixheaacd_add32_sat(x[14], x[15]), 0x5A82);
107 vi = ixheaacd_mult32x16in32_shl_sat(ixheaacd_sub32_sat(x[14], x[15]), 0x5A82);
108
109 a20 = ixheaacd_sub32_sat(x[6], vr);
110 a30 = ixheaacd_add32_sat(x[7], vi);
111
112 real[3] = ixheaacd_add32_sat(a00, a20);
113 imag[3] = ixheaacd_add32_sat(a10, a30);
114
115 real[5] = ixheaacd_add32_sat(x[6], vr);
116 imag[5] = ixheaacd_sub32_sat(x[7], vi);
117 }
118