aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/sbrdsp_fixed.c
blob: fb9aba4e8d2f4b8129db4df8c76e07ce62fd9d80 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
/*
 * AAC Spectral Band Replication decoding functions
 * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
 * Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * Note: Rounding-to-nearest used unless otherwise stated
 *
 */

#define USE_FIXED 1

#include "aac.h"
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/intfloat.h"
#include "sbrdsp.h"

static SoftFloat sbr_sum_square_c(int (*x)[2], int n)
{
    SoftFloat ret;
    uint64_t accu = 0, round;
    int i, nz;
    unsigned u;

    for (i = 0; i < n; i += 2) {
        // Larger values are inavlid and could cause overflows of accu.
        av_assert2(FFABS(x[i + 0][0]) >> 29 == 0);
        accu += (int64_t)x[i + 0][0] * x[i + 0][0];
        av_assert2(FFABS(x[i + 0][1]) >> 29 == 0);
        accu += (int64_t)x[i + 0][1] * x[i + 0][1];
        av_assert2(FFABS(x[i + 1][0]) >> 29 == 0);
        accu += (int64_t)x[i + 1][0] * x[i + 1][0];
        av_assert2(FFABS(x[i + 1][1]) >> 29 == 0);
        accu += (int64_t)x[i + 1][1] * x[i + 1][1];
    }

    u = accu >> 32;
    if (u == 0) {
        nz = 1;
    } else {
        nz = -1;
        while (u < 0x80000000U) {
            u <<= 1;
            nz++;
        }
        nz = 32 - nz;
    }

    round = 1ULL << (nz-1);
    u = ((accu + round) >> nz);
    u >>= 1;
    ret = av_int2sf(u, 15 - nz);

    return ret;
}

static void sbr_neg_odd_64_c(int *x)
{
    int i;
    for (i = 1; i < 64; i += 2)
        x[i] = -x[i];
}

static void sbr_qmf_pre_shuffle_c(int *z)
{
    int k;
    z[64] = z[0];
    z[65] = z[1];
    for (k = 1; k < 32; k++) {
        z[64+2*k  ] = -z[64 - k];
        z[64+2*k+1] =  z[ k + 1];
    }
}

static void sbr_qmf_post_shuffle_c(int W[32][2], const int *z)
{
    int k;
    for (k = 0; k < 32; k++) {
        W[k][0] = -z[63-k];
        W[k][1] = z[k];
    }
}

static void sbr_qmf_deint_neg_c(int *v, const int *src)
{
    int i;
    for (i = 0; i < 32; i++) {
        v[     i] = ( src[63 - 2*i    ] + 0x10) >> 5;
        v[63 - i] = (-src[63 - 2*i - 1] + 0x10) >> 5;
    }
}

static av_always_inline SoftFloat autocorr_calc(int64_t accu)
{
        int nz, mant, expo;
        unsigned round;
        int i = (int)(accu >> 32);
        if (i == 0) {
            nz = 1;
        } else {
            nz = 0;
            while (FFABS(i) < 0x40000000) {
                i <<= 1;
                nz++;
            }
            nz = 32-nz;
        }

        round = 1U << (nz-1);
        mant = (int)((accu + round) >> nz);
        mant = (mant + 0x40)>>7;
        mant <<= 6;
        expo = nz + 15;
        return av_int2sf(mant, 30 - expo);
}

static av_always_inline void autocorrelate(const int x[40][2], SoftFloat phi[3][2][2], int lag)
{
    int i;
    int64_t real_sum, imag_sum;
    int64_t accu_re = 0, accu_im = 0;

    if (lag) {
        for (i = 1; i < 38; i++) {
            accu_re += (int64_t)x[i][0] * x[i+lag][0];
            accu_re += (int64_t)x[i][1] * x[i+lag][1];
            accu_im += (int64_t)x[i][0] * x[i+lag][1];
            accu_im -= (int64_t)x[i][1] * x[i+lag][0];
        }

        real_sum = accu_re;
        imag_sum = accu_im;

        accu_re += (int64_t)x[ 0][0] * x[lag][0];
        accu_re += (int64_t)x[ 0][1] * x[lag][1];
        accu_im += (int64_t)x[ 0][0] * x[lag][1];
        accu_im -= (int64_t)x[ 0][1] * x[lag][0];

        phi[2-lag][1][0] = autocorr_calc(accu_re);
        phi[2-lag][1][1] = autocorr_calc(accu_im);

        if (lag == 1) {
            accu_re = real_sum;
            accu_im = imag_sum;
            accu_re += (int64_t)x[38][0] * x[39][0];
            accu_re += (int64_t)x[38][1] * x[39][1];
            accu_im += (int64_t)x[38][0] * x[39][1];
            accu_im -= (int64_t)x[38][1] * x[39][0];

            phi[0][0][0] = autocorr_calc(accu_re);
            phi[0][0][1] = autocorr_calc(accu_im);
        }
    } else {
        for (i = 1; i < 38; i++) {
            accu_re += (int64_t)x[i][0] * x[i][0];
            accu_re += (int64_t)x[i][1] * x[i][1];
        }
        real_sum = accu_re;
        accu_re += (int64_t)x[ 0][0] * x[ 0][0];
        accu_re += (int64_t)x[ 0][1] * x[ 0][1];

        phi[2][1][0] = autocorr_calc(accu_re);

        accu_re = real_sum;
        accu_re += (int64_t)x[38][0] * x[38][0];
        accu_re += (int64_t)x[38][1] * x[38][1];

        phi[1][0][0] = autocorr_calc(accu_re);
    }
}

static void sbr_autocorrelate_c(const int x[40][2], SoftFloat phi[3][2][2])
{
    autocorrelate(x, phi, 0);
    autocorrelate(x, phi, 1);
    autocorrelate(x, phi, 2);
}

static void sbr_hf_gen_c(int (*X_high)[2], const int (*X_low)[2],
                       const int alpha0[2], const int alpha1[2],
                       int bw, int start, int end)
{
    int alpha[4];
    int i;
    int64_t accu;

    accu = (int64_t)alpha0[0] * bw;
    alpha[2] = (int)((accu + 0x40000000) >> 31);
    accu = (int64_t)alpha0[1] * bw;
    alpha[3] = (int)((accu + 0x40000000) >> 31);
    accu = (int64_t)bw * bw;
    bw = (int)((accu + 0x40000000) >> 31);
    accu = (int64_t)alpha1[0] * bw;
    alpha[0] = (int)((accu + 0x40000000) >> 31);
    accu = (int64_t)alpha1[1] * bw;
    alpha[1] = (int)((accu + 0x40000000) >> 31);

    for (i = start; i < end; i++) {
        accu  = (int64_t)X_low[i][0] * 0x20000000;
        accu += (int64_t)X_low[i - 2][0] * alpha[0];
        accu -= (int64_t)X_low[i - 2][1] * alpha[1];
        accu += (int64_t)X_low[i - 1][0] * alpha[2];
        accu -= (int64_t)X_low[i - 1][1] * alpha[3];
        X_high[i][0] = (int)((accu + 0x10000000) >> 29);

        accu  = (int64_t)X_low[i][1] * 0x20000000;
        accu += (int64_t)X_low[i - 2][1] * alpha[0];
        accu += (int64_t)X_low[i - 2][0] * alpha[1];
        accu += (int64_t)X_low[i - 1][1] * alpha[2];
        accu += (int64_t)X_low[i - 1][0] * alpha[3];
        X_high[i][1] = (int)((accu + 0x10000000) >> 29);
    }
}

static void sbr_hf_g_filt_c(int (*Y)[2], const int (*X_high)[40][2],
                          const SoftFloat *g_filt, int m_max, intptr_t ixh)
{
    int m, r;
    int64_t accu;

    for (m = 0; m < m_max; m++) {
        r = 1 << (22-g_filt[m].exp);
        accu = (int64_t)X_high[m][ixh][0] * ((g_filt[m].mant + 0x40)>>7);
        Y[m][0] = (int)((accu + r) >> (23-g_filt[m].exp));

        accu = (int64_t)X_high[m][ixh][1] * ((g_filt[m].mant + 0x40)>>7);
        Y[m][1] = (int)((accu + r) >> (23-g_filt[m].exp));
    }
}

static av_always_inline void sbr_hf_apply_noise(int (*Y)[2],
                                                const SoftFloat *s_m,
                                                const SoftFloat *q_filt,
                                                int noise,
                                                int phi_sign0,
                                                int phi_sign1,
                                                int m_max)
{
    int m;

    for (m = 0; m < m_max; m++) {
        int y0 = Y[m][0];
        int y1 = Y[m][1];
        noise = (noise + 1) & 0x1ff;
        if (s_m[m].mant) {
            int shift, round;

            shift = 22 - s_m[m].exp;
            if (shift < 30) {
                round = 1 << (shift-1);
                y0 += (s_m[m].mant * phi_sign0 + round) >> shift;
                y1 += (s_m[m].mant * phi_sign1 + round) >> shift;
            }
        } else {
            int shift, round, tmp;
            int64_t accu;

            shift = 22 - q_filt[m].exp;
            if (shift < 30) {
                round = 1 << (shift-1);

                accu = (int64_t)q_filt[m].mant * ff_sbr_noise_table_fixed[noise][0];
                tmp = (int)((accu + 0x40000000) >> 31);
                y0 += (tmp + round) >> shift;

                accu = (int64_t)q_filt[m].mant * ff_sbr_noise_table_fixed[noise][1];
                tmp = (int)((accu + 0x40000000) >> 31);
                y1 += (tmp + round) >> shift;
            }
        }
        Y[m][0] = y0;
        Y[m][1] = y1;
        phi_sign1 = -phi_sign1;
    }
}

#include "sbrdsp_template.c"