FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/aacsbr.c
Date: 2024-04-19 17:50:32
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 #if ARCH_MIPS
47 #include "mips/aacsbr_mips.h"
48 #endif /* ARCH_MIPS */
49
50 /**
51 * 2^(x) for integer x
52 * @return correctly rounded float
53 */
54 140760 static av_always_inline float exp2fi(int x) {
55 /* Normal range */
56
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 140760 if (-126 <= x && x <= 128)
57 140760 return av_int2float((x+127) << 23);
58 /* Too large */
59 ✗ else if (x > 128)
60 ✗ return INFINITY;
61 /* Subnormal numbers */
62 ✗ else if (x > -150)
63 ✗ return av_int2float(1 << (x+149));
64 /* Negligibly small */
65 else
66 ✗ return 0;
67 }
68
69 static void aacsbr_func_ptr_init(AACSBRContext *c);
70
71 116 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
72 {
73 int k, previous, present;
74 float base, prod;
75
76 116 base = powf((float)stop / start, 1.0f / num_bands);
77 116 prod = start;
78 116 previous = start;
79
80
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 1310 for (k = 0; k < num_bands-1; k++) {
81 1194 prod *= base;
82 1194 present = lrintf(prod);
83 1194 bands[k] = present - previous;
84 1194 previous = present;
85 }
86 116 bands[num_bands-1] = stop - previous;
87 116 }
88
89 /// Dequantization and stereo decoding (14496-3 sp04 p203)
90 4450 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
91 {
92 int k, e;
93 int ch;
94 static const double exp2_tab[2] = {1, M_SQRT2};
95
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 5795 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
96
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 1345 int pan_offset = sbr->data[0].bs_amp_res ? 12 : 24;
97
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 3103 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
98
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 20143 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
99 float temp1, temp2, fac;
100
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 18385 if (sbr->data[0].bs_amp_res) {
101 7387 temp1 = exp2fi(sbr->data[0].env_facs_q[e][k] + 7);
102 7387 temp2 = exp2fi(pan_offset - sbr->data[1].env_facs_q[e][k]);
103 }
104 else {
105 10998 temp1 = exp2fi((sbr->data[0].env_facs_q[e][k]>>1) + 7) *
106 10998 exp2_tab[sbr->data[0].env_facs_q[e][k] & 1];
107 10998 temp2 = exp2fi((pan_offset - sbr->data[1].env_facs_q[e][k])>>1) *
108 10998 exp2_tab[(pan_offset - sbr->data[1].env_facs_q[e][k]) & 1];
109 }
110
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 18385 if (temp1 > 1E20) {
111 ✗ av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
112 ✗ temp1 = 1;
113 }
114 18385 fac = temp1 / (1.0f + temp2);
115 18385 sbr->data[0].env_facs[e][k] = fac;
116 18385 sbr->data[1].env_facs[e][k] = fac * temp2;
117 }
118 }
119
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 2995 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
120
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 6017 for (k = 0; k < sbr->n_q; k++) {
121 4367 float temp1 = exp2fi(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs_q[e][k] + 1);
122 4367 float temp2 = exp2fi(12 - sbr->data[1].noise_facs_q[e][k]);
123 float fac;
124
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 4367 av_assert0(temp1 <= 1E20);
125 4367 fac = temp1 / (1.0f + temp2);
126 4367 sbr->data[0].noise_facs[e][k] = fac;
127 4367 sbr->data[1].noise_facs[e][k] = fac * temp2;
128 }
129 }
130 } else { // SCE or one non-coupled CPE
131
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 7046 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
132
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 9997 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
133
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 82225 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++){
134
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 76169 if (sbr->data[ch].bs_amp_res)
135 44051 sbr->data[ch].env_facs[e][k] = exp2fi(sbr->data[ch].env_facs_q[e][k] + 6);
136 else
137 32118 sbr->data[ch].env_facs[e][k] = exp2fi((sbr->data[ch].env_facs_q[e][k]>>1) + 6)
138 32118 * exp2_tab[sbr->data[ch].env_facs_q[e][k] & 1];
139
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 76169 if (sbr->data[ch].env_facs[e][k] > 1E20) {
140 ✗ av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
141 ✗ sbr->data[ch].env_facs[e][k] = 1;
142 }
143 }
144
145
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 9437 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
146
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 24583 for (k = 0; k < sbr->n_q; k++)
147 19087 sbr->data[ch].noise_facs[e][k] =
148 19087 exp2fi(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs_q[e][k]);
149 }
150 }
151 4450 }
152
153 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
154 * (14496-3 sp04 p214)
155 * Warning: This routine does not seem numerically stable.
156 */
157 6631 static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
158 float (*alpha0)[2], float (*alpha1)[2],
159 const float X_low[32][40][2], int k0)
160 {
161 int k;
162
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 130955 for (k = 0; k < k0; k++) {
163 124324 LOCAL_ALIGNED_16(float, phi, [3], [2][2]);
164 float dk;
165
166 124324 dsp->autocorrelate(X_low[k], phi);
167
168 124324 dk = phi[2][1][0] * phi[1][0][0] -
169 124324 (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
170
171
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 124324 if (!dk) {
172 4007 alpha1[k][0] = 0;
173 4007 alpha1[k][1] = 0;
174 } else {
175 float temp_real, temp_im;
176 120317 temp_real = phi[0][0][0] * phi[1][1][0] -
177 120317 phi[0][0][1] * phi[1][1][1] -
178 120317 phi[0][1][0] * phi[1][0][0];
179 120317 temp_im = phi[0][0][0] * phi[1][1][1] +
180 120317 phi[0][0][1] * phi[1][1][0] -
181 120317 phi[0][1][1] * phi[1][0][0];
182
183 120317 alpha1[k][0] = temp_real / dk;
184 120317 alpha1[k][1] = temp_im / dk;
185 }
186
187
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 124324 if (!phi[1][0][0]) {
188 3622 alpha0[k][0] = 0;
189 3622 alpha0[k][1] = 0;
190 } else {
191 float temp_real, temp_im;
192 120702 temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
193 120702 alpha1[k][1] * phi[1][1][1];
194 120702 temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
195 120702 alpha1[k][0] * phi[1][1][1];
196
197 120702 alpha0[k][0] = -temp_real / phi[1][0][0];
198 120702 alpha0[k][1] = -temp_im / phi[1][0][0];
199 }
200
201
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 124324 if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
202
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 123938 alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
203 604 alpha1[k][0] = 0;
204 604 alpha1[k][1] = 0;
205 604 alpha0[k][0] = 0;
206 604 alpha0[k][1] = 0;
207 }
208 }
209 6631 }
210
211 /// Chirp Factors (14496-3 sp04 p214)
212 6631 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
213 {
214 int i;
215 float new_bw;
216 static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
217
218
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 27190 for (i = 0; i < sbr->n_q; i++) {
219
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 20559 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
220 1293 new_bw = 0.6f;
221 } else
222 19266 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
223
224
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 20559 if (new_bw < ch_data->bw_array[i]) {
225 3582 new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
226 } else
227 16977 new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
228
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 20559 ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
229 }
230 6631 }
231
232 /**
233 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
234 * and Calculation of gain (14496-3 sp04 p219)
235 */
236 6631 static void sbr_gain_calc(SpectralBandReplication *sbr,
237 SBRData *ch_data, const int e_a[2])
238 {
239 int e, k, m;
240 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
241 static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
242
243
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 16203 for (e = 0; e < ch_data->bs_num_env; e++) {
244
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 9572 int delta = !((e == e_a[1]) || (e == e_a[0]));
245
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 44040 for (k = 0; k < sbr->n_lim; k++) {
246 float gain_boost, gain_max;
247 34468 float sum[2] = { 0.0f, 0.0f };
248
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 285653 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
249 251185 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
250 251185 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
251 251185 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
252
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 251185 if (!sbr->s_mapped[e][m]) {
253 245902 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
254 245902 ((1.0f + sbr->e_curr[e][m]) *
255 245902 (1.0f + sbr->q_mapped[e][m] * delta)));
256 } else {
257 5283 sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
258 5283 ((1.0f + sbr->e_curr[e][m]) *
259 5283 (1.0f + sbr->q_mapped[e][m])));
260 }
261 251185 sbr->gain[e][m] += FLT_MIN;
262 }
263
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 285653 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
264 251185 sum[0] += sbr->e_origmapped[e][m];
265 251185 sum[1] += sbr->e_curr[e][m];
266 }
267 34468 gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
268
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 34468 gain_max = FFMIN(100000.f, gain_max);
269
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 285653 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
270 251185 float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
271
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 251185 sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
272
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 251185 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
273 }
274 34468 sum[0] = sum[1] = 0.0f;
275
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 285653 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
276 251185 sum[0] += sbr->e_origmapped[e][m];
277 502370 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
278 251185 + sbr->s_m[e][m] * sbr->s_m[e][m]
279
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 251185 + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
280 }
281 34468 gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
282
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 34468 gain_boost = FFMIN(1.584893192f, gain_boost);
283
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 285653 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
284 251185 sbr->gain[e][m] *= gain_boost;
285 251185 sbr->q_m[e][m] *= gain_boost;
286 251185 sbr->s_m[e][m] *= gain_boost;
287 }
288 }
289 }
290 6631 }
291
292 /// Assembling HF Signals (14496-3 sp04 p220)
293 6631 static void sbr_hf_assemble(float Y1[38][64][2],
294 const float X_high[64][40][2],
295 SpectralBandReplication *sbr, SBRData *ch_data,
296 const int e_a[2])
297 {
298 int e, i, j, m;
299
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 6631 const int h_SL = 4 * !sbr->bs_smoothing_mode;
300 6631 const int kx = sbr->kx[1];
301 6631 const int m_max = sbr->m[1];
302 static const float h_smooth[5] = {
303 0.33333333333333,
304 0.30150283239582,
305 0.21816949906249,
306 0.11516383427084,
307 0.03183050093751,
308 };
309 6631 float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
310 6631 int indexnoise = ch_data->f_indexnoise;
311 6631 int indexsine = ch_data->f_indexsine;
312
313
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 6631 if (sbr->reset) {
314
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 87 for (i = 0; i < h_SL; i++) {
315 8 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
316 8 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
317 }
318
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 6552 } else if (h_SL) {
319
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 5730 for (i = 0; i < 4; i++) {
320 4584 memcpy(g_temp[i + 2 * ch_data->t_env[0]],
321 4584 g_temp[i + 2 * ch_data->t_env_num_env_old],
322 sizeof(g_temp[0]));
323 4584 memcpy(q_temp[i + 2 * ch_data->t_env[0]],
324 4584 q_temp[i + 2 * ch_data->t_env_num_env_old],
325 sizeof(q_temp[0]));
326 }
327 }
328
329
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 16203 for (e = 0; e < ch_data->bs_num_env; e++) {
330
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 221764 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
331 212192 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
332 212192 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
333 }
334 }
335
336
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 16203 for (e = 0; e < ch_data->bs_num_env; e++) {
337
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 221764 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
338 212192 LOCAL_ALIGNED_16(float, g_filt_tab, [48]);
339 212192 LOCAL_ALIGNED_16(float, q_filt_tab, [48]);
340 float *g_filt, *q_filt;
341
342
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 212192 if (h_SL && e != e_a[0] && e != e_a[1]) {
343 36634 g_filt = g_filt_tab;
344 36634 q_filt = q_filt_tab;
345
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 659412 for (m = 0; m < m_max; m++) {
346 622778 const int idx1 = i + h_SL;
347 622778 g_filt[m] = 0.0f;
348 622778 q_filt[m] = 0.0f;
349
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 3736668 for (j = 0; j <= h_SL; j++) {
350 3113890 g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j];
351 3113890 q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j];
352 }
353 }
354 } else {
355 175558 g_filt = g_temp[i + h_SL];
356 175558 q_filt = q_temp[i];
357 }
358
359 212192 sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,
360 212192 i + ENVELOPE_ADJUSTMENT_OFFSET);
361
362
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 212192 if (e != e_a[0] && e != e_a[1]) {
363 209970 sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],
364 q_filt, indexnoise,
365 kx, m_max);
366 } else {
367 2222 int idx = indexsine&1;
368 2222 int A = (1-((indexsine+(kx & 1))&2));
369 2222 int B = (A^(-idx)) + idx;
370 2222 float *out = &Y1[i][kx][idx];
371 2222 float *in = sbr->s_m[e];
372
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 30250 for (m = 0; m+1 < m_max; m+=2) {
373 28028 out[2*m ] += in[m ] * A;
374 28028 out[2*m+2] += in[m+1] * B;
375 }
376
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 2222 if(m_max&1)
377 1288 out[2*m ] += in[m ] * A;
378 }
379 212192 indexnoise = (indexnoise + m_max) & 0x1ff;
380 212192 indexsine = (indexsine + 1) & 3;
381 }
382 }
383 6631 ch_data->f_indexnoise = indexnoise;
384 6631 ch_data->f_indexsine = indexsine;
385 6631 }
386
387 #include "aacsbr_template.c"
388