FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/aacsbr.c
Date: 2026-08-14 15:11:37
Exec Total Coverage
Lines: 189 198 95.5%
Functions: 7 7 100.0%
Branches: 123 132 93.2%
Line Branch Exec Source
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
23 /**
24 * @file
25 * AAC Spectral Band Replication decoding functions
26 * @author Robert Swain ( rob opendot cl )
27 */
28 #define USE_FIXED 0
29
30 #include "aac.h"
31 #include "sbr.h"
32 #include "aacsbr.h"
33 #include "aacsbrdata.h"
34 #include "aacps.h"
35 #include "sbrdsp.h"
36 #include "libavutil/internal.h"
37 #include "libavutil/intfloat.h"
38 #include "libavutil/libm.h"
39 #include "libavutil/avassert.h"
40 #include "libavutil/mem_internal.h"
41
42 #include <stdint.h>
43 #include <float.h>
44 #include <math.h>
45
46 /**
47 * 2^(x) for integer x
48 * @return correctly rounded float
49 */
50 143512 static av_always_inline float exp2fi(int x) {
51 /* Normal range */
52
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 143512 if (-126 <= x && x <= 128)
53 143512 return av_int2float((x+127) << 23);
54 /* Too large */
55 ✗ else if (x > 128)
56 ✗ return INFINITY;
57 /* Subnormal numbers */
58 ✗ else if (x > -150)
59 ✗ return av_int2float(1 << (x+149));
60 /* Negligibly small */
61 else
62 ✗ return 0;
63 }
64
65 static void aacsbr_func_ptr_init(AACSBRContext *c);
66
67 126 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
68 {
69 int k, previous, present;
70 float base, prod;
71
72 126 base = powf((float)stop / start, 1.0f / num_bands);
73 126 prod = start;
74 126 previous = start;
75
76
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 1414 for (k = 0; k < num_bands-1; k++) {
77 1288 prod *= base;
78 1288 present = lrintf(prod);
79 1288 bands[k] = present - previous;
80 1288 previous = present;
81 }
82 126 bands[num_bands-1] = stop - previous;
83 126 }
84
85 /// Dequantization and stereo decoding (14496-3 sp04 p203)
86 4545 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
87 {
88 int k, e;
89 int ch;
90 static const double exp2_tab[2] = {1, M_SQRT2};
91
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 5890 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
92
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 1345 int pan_offset = sbr->data[0].bs_amp_res ? 12 : 24;
93
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 3103 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
94
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 20143 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
95 float temp1, temp2, fac;
96
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 18385 if (sbr->data[0].bs_amp_res) {
97 7387 temp1 = exp2fi(sbr->data[0].env_facs_q[e][k] + 7);
98 7387 temp2 = exp2fi(pan_offset - sbr->data[1].env_facs_q[e][k]);
99 }
100 else {
101 10998 temp1 = exp2fi((sbr->data[0].env_facs_q[e][k]>>1) + 7) *
102 10998 exp2_tab[sbr->data[0].env_facs_q[e][k] & 1];
103 10998 temp2 = exp2fi((pan_offset - sbr->data[1].env_facs_q[e][k])>>1) *
104 10998 exp2_tab[(pan_offset - sbr->data[1].env_facs_q[e][k]) & 1];
105 }
106
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 18385 if (temp1 > 1E20) {
107 ✗ av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
108 ✗ temp1 = 1;
109 }
110 18385 fac = temp1 / (1.0f + temp2);
111 18385 sbr->data[0].env_facs[e][k] = fac;
112 18385 sbr->data[1].env_facs[e][k] = fac * temp2;
113 }
114 }
115
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 2995 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
116
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 6017 for (k = 0; k < sbr->n_q; k++) {
117 4367 float temp1 = exp2fi(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs_q[e][k] + 1);
118 4367 float temp2 = exp2fi(12 - sbr->data[1].noise_facs_q[e][k]);
119 float fac;
120
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 4367 av_assert0(temp1 <= 1E20);
121 4367 fac = temp1 / (1.0f + temp2);
122 4367 sbr->data[0].noise_facs[e][k] = fac;
123 4367 sbr->data[1].noise_facs[e][k] = fac * temp2;
124 }
125 }
126 } else { // SCE or one non-coupled CPE
127
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 7283 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
128
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 10335 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
129
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 84715 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++){
130
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 78463 if (sbr->data[ch].bs_amp_res)
131 44925 sbr->data[ch].env_facs[e][k] = exp2fi(sbr->data[ch].env_facs_q[e][k] + 6);
132 else
133 33538 sbr->data[ch].env_facs[e][k] = exp2fi((sbr->data[ch].env_facs_q[e][k]>>1) + 6)
134 33538 * exp2_tab[sbr->data[ch].env_facs_q[e][k] & 1];
135
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 78463 if (sbr->data[ch].env_facs[e][k] > 1E20) {
136 ✗ av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
137 ✗ sbr->data[ch].env_facs[e][k] = 1;
138 }
139 }
140
141
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 9751 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
142
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 25213 for (k = 0; k < sbr->n_q; k++)
143 19545 sbr->data[ch].noise_facs[e][k] =
144 19545 exp2fi(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs_q[e][k]);
145 }
146 }
147 4545 }
148
149 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
150 * (14496-3 sp04 p214)
151 * Warning: This routine does not seem numerically stable.
152 */
153 6773 static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
154 float (*alpha0)[2], float (*alpha1)[2],
155 const float X_low[32][40][2], int k0)
156 {
157 int k;
158
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 134929 for (k = 0; k < k0; k++) {
159 128156 LOCAL_ALIGNED_16(float, phi, [3], [2][2]);
160 float dk;
161
162 128156 dsp->autocorrelate(X_low[k], phi);
163
164 128156 dk = phi[2][1][0] * phi[1][0][0] -
165 128156 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
166
167
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 128156 if (!dk) {
168 4194 alpha1[k][0] = 0;
169 4194 alpha1[k][1] = 0;
170 } else {
171 float temp_real, temp_im;
172 123962 temp_real = phi[0][0][0] * phi[1][1][0] -
173 123962 phi[0][0][1] * phi[1][1][1] -
174 123962 phi[0][1][0] * phi[1][0][0];
175 123962 temp_im = phi[0][0][0] * phi[1][1][1] +
176 123962 phi[0][0][1] * phi[1][1][0] -
177 123962 phi[0][1][1] * phi[1][0][0];
178
179 123962 alpha1[k][0] = temp_real / dk;
180 123962 alpha1[k][1] = temp_im / dk;
181 }
182
183
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 128156 if (!phi[1][0][0]) {
184 3809 alpha0[k][0] = 0;
185 3809 alpha0[k][1] = 0;
186 } else {
187 float temp_real, temp_im;
188 124347 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
189 124347 alpha1[k][1] * phi[1][1][1];
190 124347 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
191 124347 alpha1[k][0] * phi[1][1][1];
192
193 124347 alpha0[k][0] = -temp_real / phi[1][0][0];
194 124347 alpha0[k][1] = -temp_im / phi[1][0][0];
195 }
196
197
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 128156 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
198
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 127752 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
199 622 alpha1[k][0] = 0;
200 622 alpha1[k][1] = 0;
201 622 alpha0[k][0] = 0;
202 622 alpha0[k][1] = 0;
203 }
204 }
205 6773 }
206
207 /// Chirp Factors (14496-3 sp04 p214)
208 6773 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
209 {
210 int i;
211 float new_bw;
212 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
213
214
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 27710 for (i = 0; i < sbr->n_q; i++) {
215
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 20937 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
216 1353 new_bw = 0.6f;
217 } else
218 19584 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
219
220
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 20937 if (new_bw < ch_data->bw_array[i]) {
221 3711 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
222 } else
223 17226 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
224
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 20937 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
225 }
226 6773 }
227
228 /**
229 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
230 * and Calculation of gain (14496-3 sp04 p219)
231 */
232 6773 static void sbr_gain_calc(SpectralBandReplication *sbr,
233 SBRData *ch_data, const int e_a[2])
234 {
235 int e, k, m;
236 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
237 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
238
239
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 16541 for (e = 0; e < ch_data->bs_num_env; e++) {
240
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 9768 int delta = !((e == e_a[1]) || (e == e_a[0]));
241
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 44890 for (k = 0; k < sbr->n_lim; k++) {
242 float gain_boost, gain_max;
243 35122 float sum[2] = { 0.0f, 0.0f };
244
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 292581 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
245 257459 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
246 257459 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
247 257459 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
248
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 257459 if (!sbr->s_mapped[e][m]) {
249 252176 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
250 252176 ((1.0f + sbr->e_curr[e][m]) *
251 252176 (1.0f + sbr->q_mapped[e][m] * delta)));
252 } else {
253 5283 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
254 5283 ((1.0f + sbr->e_curr[e][m]) *
255 5283 (1.0f + sbr->q_mapped[e][m])));
256 }
257 257459 sbr->gain[e][m] += FLT_MIN;
258 }
259
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 292581 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
260 257459 sum[0] += sbr->e_origmapped[e][m];
261 257459 sum[1] += sbr->e_curr[e][m];
262 }
263 35122 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
264
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 35122 gain_max = FFMIN(100000.f, gain_max);
265
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 292581 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
266 257459 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
267
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 257459 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
268
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 257459 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
269 }
270 35122 sum[0] = sum[1] = 0.0f;
271
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 292581 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
272 257459 sum[0] += sbr->e_origmapped[e][m];
273 514918 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
274 257459 + sbr->s_m[e][m] * sbr->s_m[e][m]
275
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 257459 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
276 }
277 35122 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
278
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 35122 gain_boost = FFMIN(1.584893192f, gain_boost);
279
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 292581 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
280 257459 sbr->gain[e][m] *= gain_boost;
281 257459 sbr->q_m[e][m] *= gain_boost;
282 257459 sbr->s_m[e][m] *= gain_boost;
283 }
284 }
285 }
286 6773 }
287
288 /// Assembling HF Signals (14496-3 sp04 p220)
289 6773 static void sbr_hf_assemble(float Y1[38][64][2],
290 const float X_high[64][40][2],
291 SpectralBandReplication *sbr, SBRData *ch_data,
292 const int e_a[2])
293 {
294 int e, i, j, m;
295
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 6773 const int h_SL = 4 * !sbr->bs_smoothing_mode;
296 6773 const int kx = sbr->kx[1];
297 6773 const int m_max = sbr->m[1];
298 static const float h_smooth[5] = {
299 0.33333333333333,
300 0.30150283239582,
301 0.21816949906249,
302 0.11516383427084,
303 0.03183050093751,
304 };
305 6773 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
306 6773 int indexnoise = ch_data->f_indexnoise;
307 6773 int indexsine = ch_data->f_indexsine;
308
309
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 6773 if (sbr->reset) {
310
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 93 for (i = 0; i < h_SL; i++) {
311 8 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
312 8 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
313 }
314
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 6688 } else if (h_SL) {
315
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 5730 for (i = 0; i < 4; i++) {
316 4584 memcpy(g_temp[i + 2 * ch_data->t_env[0]],
317 4584 g_temp[i + 2 * ch_data->t_env_num_env_old],
318 sizeof(g_temp[0]));
319 4584 memcpy(q_temp[i + 2 * ch_data->t_env[0]],
320 4584 q_temp[i + 2 * ch_data->t_env_num_env_old],
321 sizeof(q_temp[0]));
322 }
323 }
324
325
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 16541 for (e = 0; e < ch_data->bs_num_env; e++) {
326
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 226504 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
327 216736 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
328 216736 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
329 }
330 }
331
332
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 16541 for (e = 0; e < ch_data->bs_num_env; e++) {
333
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 226504 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
334 216736 LOCAL_ALIGNED_16(float, g_filt_tab, [48]);
335 216736 LOCAL_ALIGNED_16(float, q_filt_tab, [48]);
336 float *g_filt, *q_filt;
337
338
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 216736 if (h_SL && e != e_a[0] && e != e_a[1]) {
339 36634 g_filt = g_filt_tab;
340 36634 q_filt = q_filt_tab;
341
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 659412 for (m = 0; m < m_max; m++) {
342 622778 const int idx1 = i + h_SL;
343 622778 g_filt[m] = 0.0f;
344 622778 q_filt[m] = 0.0f;
345
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 3736668 for (j = 0; j <= h_SL; j++) {
346 3113890 g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j];
347 3113890 q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j];
348 }
349 }
350 } else {
351 180102 g_filt = g_temp[i + h_SL];
352 180102 q_filt = q_temp[i];
353 }
354
355 216736 sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,
356 216736 i + ENVELOPE_ADJUSTMENT_OFFSET);
357
358
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 216736 if (e != e_a[0] && e != e_a[1]) {
359 214454 sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],
360 q_filt, indexnoise,
361 kx, m_max);
362 } else {
363 2282 int idx = indexsine&1;
364 2282 int A = (1-((indexsine+(kx & 1))&2));
365 2282 int B = (A^(-idx)) + idx;
366 2282 float *out = &Y1[i][kx][idx];
367 2282 float *in = sbr->s_m[e];
368
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 31250 for (m = 0; m+1 < m_max; m+=2) {
369 28968 out[2*m ] += in[m ] * A;
370 28968 out[2*m+2] += in[m+1] * B;
371 }
372
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 2282 if(m_max&1)
373 1328 out[2*m ] += in[m ] * A;
374 }
375 216736 indexnoise = (indexnoise + m_max) & 0x1ff;
376 216736 indexsine = (indexsine + 1) & 3;
377 }
378 }
379 6773 ch_data->f_indexnoise = indexnoise;
380 6773 ch_data->f_indexsine = indexsine;
381 6773 }
382
383 #include "aacsbr_template.c"
384