FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/aacsbr_fixed.c
Date: 2022-07-05 19:52:29
Exec Total Coverage
Lines: 272 292 93.2%
Branches: 163 174 93.7%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2013
3 * MIPS Technologies, Inc., California.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * AAC Spectral Band Replication decoding functions (fixed-point)
30 * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
31 * Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
32 *
33 * This file is part of FFmpeg.
34 *
35 * FFmpeg is free software; you can redistribute it and/or
36 * modify it under the terms of the GNU Lesser General Public
37 * License as published by the Free Software Foundation; either
38 * version 2.1 of the License, or (at your option) any later version.
39 *
40 * FFmpeg is distributed in the hope that it will be useful,
41 * but WITHOUT ANY WARRANTY; without even the implied warranty of
42 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
43 * Lesser General Public License for more details.
44 *
45 * You should have received a copy of the GNU Lesser General Public
46 * License along with FFmpeg; if not, write to the Free Software
47 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
48 */
49
50 /**
51 * @file
52 * AAC Spectral Band Replication decoding functions (fixed-point)
53 * Note: Rounding-to-nearest used unless otherwise stated
54 * @author Robert Swain ( rob opendot cl )
55 * @author Stanislav Ocovaj ( stanislav.ocovaj imgtec com )
56 */
57 #define USE_FIXED 1
58
59 #include "aac.h"
60 #include "sbr.h"
61 #include "aacsbr.h"
62 #include "aacsbrdata.h"
63 #include "fft.h"
64 #include "aacps.h"
65 #include "sbrdsp.h"
66 #include "libavutil/internal.h"
67 #include "libavutil/libm.h"
68 #include "libavutil/avassert.h"
69
70 #include <stdint.h>
71 #include <float.h>
72 #include <math.h>
73
74 static VLC vlc_sbr[10];
75 static void aacsbr_func_ptr_init(AACSBRContext *c);
76 static const int CONST_LN2 = Q31(0.6931471806/256); // ln(2)/256
77 static const int CONST_RECIP_LN2 = Q31(0.7213475204); // 0.5/ln(2)
78 static const int CONST_076923 = Q31(0.76923076923076923077f);
79
80 static const int fixed_log_table[10] =
81 {
82 Q31(1.0/2), Q31(1.0/3), Q31(1.0/4), Q31(1.0/5), Q31(1.0/6),
83 Q31(1.0/7), Q31(1.0/8), Q31(1.0/9), Q31(1.0/10), Q31(1.0/11)
84 };
85
86 24 static int fixed_log(int x)
87 {
88 int i, ret, xpow, tmp;
89
90 24 ret = x;
91 24 xpow = x;
92
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 144 for (i=0; i<10; i+=2){
93 120 xpow = (int)(((int64_t)xpow * x + 0x40000000) >> 31);
94 120 tmp = (int)(((int64_t)xpow * fixed_log_table[i] + 0x40000000) >> 31);
95 120 ret -= tmp;
96
97 120 xpow = (int)(((int64_t)xpow * x + 0x40000000) >> 31);
98 120 tmp = (int)(((int64_t)xpow * fixed_log_table[i+1] + 0x40000000) >> 31);
99 120 ret += tmp;
100 }
101
102 24 return ret;
103 }
104
105 static const int fixed_exp_table[7] =
106 {
107 Q31(1.0/2), Q31(1.0/6), Q31(1.0/24), Q31(1.0/120),
108 Q31(1.0/720), Q31(1.0/5040), Q31(1.0/40320)
109 };
110
111 12 static int fixed_exp(int x)
112 {
113 int i, ret, xpow, tmp;
114
115 12 ret = 0x800000 + x;
116 12 xpow = x;
117
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 96 for (i=0; i<7; i++){
118 84 xpow = (int)(((int64_t)xpow * x + 0x400000) >> 23);
119 84 tmp = (int)(((int64_t)xpow * fixed_exp_table[i] + 0x40000000) >> 31);
120 84 ret += tmp;
121 }
122
123 12 return ret;
124 }
125
126 12 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
127 {
128 int k, previous, present;
129 12 int base, prod, nz = 0;
130
131 12 base = (stop << 23) / start;
132
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 85 while (base < 0x40000000){
133 73 base <<= 1;
134 73 nz++;
135 }
136 12 base = fixed_log(base - 0x80000000);
137 12 base = (((base + 0x80) >> 8) + (8-nz)*CONST_LN2) / num_bands;
138 12 base = fixed_exp(base);
139
140 12 previous = start;
141 12 prod = start << 23;
142
143
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 123 for (k = 0; k < num_bands-1; k++) {
144 111 prod = (int)(((int64_t)prod * base + 0x400000) >> 23);
145 111 present = (prod + 0x400000) >> 23;
146 111 bands[k] = present - previous;
147 111 previous = present;
148 }
149 12 bands[num_bands-1] = stop - previous;
150 12 }
151
152 /// Dequantization and stereo decoding (14496-3 sp04 p203)
153 2082 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
154 {
155 int k, e;
156 int ch;
157
158
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 3362 if (id_aac == TYPE_CPE && sbr->bs_coupling) {
159
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 1280 int alpha = sbr->data[0].bs_amp_res ? 2 : 1;
160
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 1280 int pan_offset = sbr->data[0].bs_amp_res ? 12 : 24;
161
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 2922 for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
162
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 19065 for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
163 SoftFloat temp1, temp2, fac;
164
165 17423 temp1.exp = sbr->data[0].env_facs_q[e][k] * alpha + 14;
166
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 17423 if (temp1.exp & 1)
167 4733 temp1.mant = 759250125;
168 else
169 12690 temp1.mant = 0x20000000;
170 17423 temp1.exp = (temp1.exp >> 1) + 1;
171
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 17423 if (temp1.exp > 66) { // temp1 > 1E20
172 ✗ av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
173 ✗ temp1 = FLOAT_1;
174 }
175
176 17423 temp2.exp = (pan_offset - sbr->data[1].env_facs_q[e][k]) * alpha;
177
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 17423 if (temp2.exp & 1)
178 ✗ temp2.mant = 759250125;
179 else
180 17423 temp2.mant = 0x20000000;
181 17423 temp2.exp = (temp2.exp >> 1) + 1;
182 17423 fac = av_div_sf(temp1, av_add_sf(FLOAT_1, temp2));
183 17423 sbr->data[0].env_facs[e][k] = fac;
184 17423 sbr->data[1].env_facs[e][k] = av_mul_sf(fac, temp2);
185 }
186 }
187
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 2837 for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
188
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 5699 for (k = 0; k < sbr->n_q; k++) {
189 SoftFloat temp1, temp2, fac;
190
191 4142 temp1.exp = NOISE_FLOOR_OFFSET - \
192 4142 sbr->data[0].noise_facs_q[e][k] + 2;
193 4142 temp1.mant = 0x20000000;
194
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 4142 av_assert0(temp1.exp <= 66);
195 4142 temp2.exp = 12 - sbr->data[1].noise_facs_q[e][k] + 1;
196 4142 temp2.mant = 0x20000000;
197 4142 fac = av_div_sf(temp1, av_add_sf(FLOAT_1, temp2));
198 4142 sbr->data[0].noise_facs[e][k] = fac;
199 4142 sbr->data[1].noise_facs[e][k] = av_mul_sf(fac, temp2);
200 }
201 }
202 } else { // SCE or one non-coupled CPE
203
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 2029 for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
204
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 1227 int alpha = sbr->data[ch].bs_amp_res ? 2 : 1;
205
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 3531 for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
206
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 26435 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++){
207 SoftFloat temp1;
208
209 24131 temp1.exp = alpha * sbr->data[ch].env_facs_q[e][k] + 12;
210
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 24131 if (temp1.exp & 1)
211 2958 temp1.mant = 759250125;
212 else
213 21173 temp1.mant = 0x20000000;
214 24131 temp1.exp = (temp1.exp >> 1) + 1;
215
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 24131 if (temp1.exp > 66) { // temp1 > 1E20
216 ✗ av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
217 ✗ temp1 = FLOAT_1;
218 }
219 24131 sbr->data[ch].env_facs[e][k] = temp1;
220 }
221
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 3181 for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
222
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 7656 for (k = 0; k < sbr->n_q; k++){
223 5702 sbr->data[ch].noise_facs[e][k].exp = NOISE_FLOOR_OFFSET - \
224 5702 sbr->data[ch].noise_facs_q[e][k] + 1;
225 5702 sbr->data[ch].noise_facs[e][k].mant = 0x20000000;
226 }
227 }
228 }
229 2082 }
230
231 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
232 * (14496-3 sp04 p214)
233 * Warning: This routine does not seem numerically stable.
234 */
235 3787 static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
236 int (*alpha0)[2], int (*alpha1)[2],
237 const int X_low[32][40][2], int k0)
238 {
239 int k;
240 int shift, round;
241
242
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 71885 for (k = 0; k < k0; k++) {
243 SoftFloat phi[3][2][2];
244 SoftFloat a00, a01, a10, a11;
245 SoftFloat dk;
246
247 68098 dsp->autocorrelate(X_low[k], phi);
248
249 68098 dk = av_sub_sf(av_mul_sf(phi[2][1][0], phi[1][0][0]),
250 av_mul_sf(av_add_sf(av_mul_sf(phi[1][1][0], phi[1][1][0]),
251 av_mul_sf(phi[1][1][1], phi[1][1][1])), FLOAT_0999999));
252
253
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 68098 if (!dk.mant) {
254 1708 a10 = FLOAT_0;
255 1708 a11 = FLOAT_0;
256 } else {
257 SoftFloat temp_real, temp_im;
258 66390 temp_real = av_sub_sf(av_sub_sf(av_mul_sf(phi[0][0][0], phi[1][1][0]),
259 av_mul_sf(phi[0][0][1], phi[1][1][1])),
260 av_mul_sf(phi[0][1][0], phi[1][0][0]));
261 66390 temp_im = av_sub_sf(av_add_sf(av_mul_sf(phi[0][0][0], phi[1][1][1]),
262 av_mul_sf(phi[0][0][1], phi[1][1][0])),
263 av_mul_sf(phi[0][1][1], phi[1][0][0]));
264
265 66390 a10 = av_div_sf(temp_real, dk);
266 66390 a11 = av_div_sf(temp_im, dk);
267 }
268
269
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 68098 if (!phi[1][0][0].mant) {
270 1708 a00 = FLOAT_0;
271 1708 a01 = FLOAT_0;
272 } else {
273 SoftFloat temp_real, temp_im;
274 66390 temp_real = av_add_sf(phi[0][0][0],
275 av_add_sf(av_mul_sf(a10, phi[1][1][0]),
276 av_mul_sf(a11, phi[1][1][1])));
277 66390 temp_im = av_add_sf(phi[0][0][1],
278 av_sub_sf(av_mul_sf(a11, phi[1][1][0]),
279 av_mul_sf(a10, phi[1][1][1])));
280
281 66390 temp_real.mant = -temp_real.mant;
282 66390 temp_im.mant = -temp_im.mant;
283 66390 a00 = av_div_sf(temp_real, phi[1][0][0]);
284 66390 a01 = av_div_sf(temp_im, phi[1][0][0]);
285 }
286
287 68098 shift = a00.exp;
288
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 68098 if (shift >= 3)
289 2 alpha0[k][0] = 0x7fffffff;
290
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 68096 else if (shift <= -30)
291 2123 alpha0[k][0] = 0;
292 else {
293 65973 shift = 1-shift;
294
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 65973 if (shift <= 0)
295 1838 alpha0[k][0] = a00.mant * (1<<-shift);
296 else {
297 64135 round = 1 << (shift-1);
298 64135 alpha0[k][0] = (a00.mant + round) >> shift;
299 }
300 }
301
302 68098 shift = a01.exp;
303
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 68098 if (shift >= 3)
304 3 alpha0[k][1] = 0x7fffffff;
305
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 68095 else if (shift <= -30)
306 2078 alpha0[k][1] = 0;
307 else {
308 66017 shift = 1-shift;
309
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 66017 if (shift <= 0)
310 14382 alpha0[k][1] = a01.mant * (1<<-shift);
311 else {
312 51635 round = 1 << (shift-1);
313 51635 alpha0[k][1] = (a01.mant + round) >> shift;
314 }
315 }
316 68098 shift = a10.exp;
317
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 68098 if (shift >= 3)
318 5 alpha1[k][0] = 0x7fffffff;
319
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 68093 else if (shift <= -30)
320 2024 alpha1[k][0] = 0;
321 else {
322 66069 shift = 1-shift;
323
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 66069 if (shift <= 0)
324 76 alpha1[k][0] = a10.mant * (1<<-shift);
325 else {
326 65993 round = 1 << (shift-1);
327 65993 alpha1[k][0] = (a10.mant + round) >> shift;
328 }
329 }
330
331 68098 shift = a11.exp;
332
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 68098 if (shift >= 3)
333 ✗ alpha1[k][1] = 0x7fffffff;
334
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 68098 else if (shift <= -30)
335 2114 alpha1[k][1] = 0;
336 else {
337 65984 shift = 1-shift;
338
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 65984 if (shift <= 0)
339 84 alpha1[k][1] = a11.mant * (1<<-shift);
340 else {
341 65900 round = 1 << (shift-1);
342 65900 alpha1[k][1] = (a11.mant + round) >> shift;
343 }
344 }
345
346 68098 shift = (int)(((int64_t)(alpha1[k][0]>>1) * (alpha1[k][0]>>1) + \
347 68098 (int64_t)(alpha1[k][1]>>1) * (alpha1[k][1]>>1) + \
348 68098 0x40000000) >> 31);
349
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 68098 if (shift >= 0x20000000){
350 ✗ alpha1[k][0] = 0;
351 ✗ alpha1[k][1] = 0;
352 ✗ alpha0[k][0] = 0;
353 ✗ alpha0[k][1] = 0;
354 }
355
356 68098 shift = (int)(((int64_t)(alpha0[k][0]>>1) * (alpha0[k][0]>>1) + \
357 68098 (int64_t)(alpha0[k][1]>>1) * (alpha0[k][1]>>1) + \
358 68098 0x40000000) >> 31);
359
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 68098 if (shift >= 0x20000000){
360 ✗ alpha1[k][0] = 0;
361 ✗ alpha1[k][1] = 0;
362 ✗ alpha0[k][0] = 0;
363 ✗ alpha0[k][1] = 0;
364 }
365 }
366 3787 }
367
368 /// Chirp Factors (14496-3 sp04 p214)
369 3787 static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
370 {
371 int i;
372 int new_bw;
373 static const int bw_tab[] = { 0, 1610612736, 1932735283, 2104533975 };
374 int64_t accu;
375
376
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 14000 for (i = 0; i < sbr->n_q; i++) {
377
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 10213 if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1)
378 799 new_bw = 1288490189;
379 else
380 9414 new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
381
382
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 10213 if (new_bw < ch_data->bw_array[i]){
383 2080 accu = (int64_t)new_bw * 1610612736;
384 2080 accu += (int64_t)ch_data->bw_array[i] * 0x20000000;
385 2080 new_bw = (int)((accu + 0x40000000) >> 31);
386 } else {
387 8133 accu = (int64_t)new_bw * 1946157056;
388 8133 accu += (int64_t)ch_data->bw_array[i] * 201326592;
389 8133 new_bw = (int)((accu + 0x40000000) >> 31);
390 }
391
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 10213 ch_data->bw_array[i] = new_bw < 0x2000000 ? 0 : new_bw;
392 }
393 3787 }
394
395 /**
396 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
397 * and Calculation of gain (14496-3 sp04 p219)
398 */
399 3787 static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
400 SBRData *ch_data, const int e_a[2])
401 {
402 int e, k, m;
403 // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
404 static const SoftFloat limgain[4] = { { 760155524, 0 }, { 0x20000000, 1 },
405 { 758351638, 1 }, { 625000000, 34 } };
406
407
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 9375 for (e = 0; e < ch_data->bs_num_env; e++) {
408
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 5588 int delta = !((e == e_a[1]) || (e == e_a[0]));
409
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 23292 for (k = 0; k < sbr->n_lim; k++) {
410 SoftFloat gain_boost, gain_max;
411 SoftFloat sum[2];
412 17704 sum[0] = sum[1] = FLOAT_0;
413
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 145541 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
414 127837 const SoftFloat temp = av_div_sf(sbr->e_origmapped[e][m],
415 av_add_sf(FLOAT_1, sbr->q_mapped[e][m]));
416 127837 sbr->q_m[e][m] = av_sqrt_sf(av_mul_sf(temp, sbr->q_mapped[e][m]));
417 127837 sbr->s_m[e][m] = av_sqrt_sf(av_mul_sf(temp, av_int2sf(ch_data->s_indexmapped[e + 1][m], 0)));
418
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 127837 if (!sbr->s_mapped[e][m]) {
419
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 123205 if (delta) {
420 115357 sbr->gain[e][m] = av_sqrt_sf(av_div_sf(sbr->e_origmapped[e][m],
421 av_mul_sf(av_add_sf(FLOAT_1, sbr->e_curr[e][m]),
422 av_add_sf(FLOAT_1, sbr->q_mapped[e][m]))));
423 } else {
424 7848 sbr->gain[e][m] = av_sqrt_sf(av_div_sf(sbr->e_origmapped[e][m],
425 av_add_sf(FLOAT_1, sbr->e_curr[e][m])));
426 }
427 } else {
428 4632 sbr->gain[e][m] = av_sqrt_sf(
429 av_div_sf(
430 av_mul_sf(sbr->e_origmapped[e][m], sbr->q_mapped[e][m]),
431 av_mul_sf(
432 av_add_sf(FLOAT_1, sbr->e_curr[e][m]),
433 av_add_sf(FLOAT_1, sbr->q_mapped[e][m]))));
434 }
435 127837 sbr->gain[e][m] = av_add_sf(sbr->gain[e][m], FLOAT_MIN);
436 }
437
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 145541 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
438 127837 sum[0] = av_add_sf(sum[0], sbr->e_origmapped[e][m]);
439 127837 sum[1] = av_add_sf(sum[1], sbr->e_curr[e][m]);
440 }
441 17704 gain_max = av_mul_sf(limgain[sbr->bs_limiter_gains],
442 av_sqrt_sf(
443 av_div_sf(
444 av_add_sf(FLOAT_EPSILON, sum[0]),
445 av_add_sf(FLOAT_EPSILON, sum[1]))));
446
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 17704 if (av_gt_sf(gain_max, FLOAT_100000))
447 3741 gain_max = FLOAT_100000;
448
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 145541 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
449 127837 SoftFloat q_m_max = av_div_sf(
450 av_mul_sf(sbr->q_m[e][m], gain_max),
451 sbr->gain[e][m]);
452
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 127837 if (av_gt_sf(sbr->q_m[e][m], q_m_max))
453 33577 sbr->q_m[e][m] = q_m_max;
454
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 127837 if (av_gt_sf(sbr->gain[e][m], gain_max))
455 33577 sbr->gain[e][m] = gain_max;
456 }
457 17704 sum[0] = sum[1] = FLOAT_0;
458
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 145541 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
459 127837 sum[0] = av_add_sf(sum[0], sbr->e_origmapped[e][m]);
460 127837 sum[1] = av_add_sf(sum[1],
461 av_mul_sf(
462 av_mul_sf(sbr->e_curr[e][m],
463 sbr->gain[e][m]),
464 sbr->gain[e][m]));
465 127837 sum[1] = av_add_sf(sum[1],
466 av_mul_sf(sbr->s_m[e][m], sbr->s_m[e][m]));
467
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 127837 if (delta && !sbr->s_m[e][m].mant)
468 117689 sum[1] = av_add_sf(sum[1],
469 av_mul_sf(sbr->q_m[e][m], sbr->q_m[e][m]));
470 }
471 17704 gain_boost = av_sqrt_sf(
472 av_div_sf(
473 av_add_sf(FLOAT_EPSILON, sum[0]),
474 av_add_sf(FLOAT_EPSILON, sum[1])));
475
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 17704 if (av_gt_sf(gain_boost, FLOAT_1584893192))
476 1483 gain_boost = FLOAT_1584893192;
477
478
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 145541 for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
479 127837 sbr->gain[e][m] = av_mul_sf(sbr->gain[e][m], gain_boost);
480 127837 sbr->q_m[e][m] = av_mul_sf(sbr->q_m[e][m], gain_boost);
481 127837 sbr->s_m[e][m] = av_mul_sf(sbr->s_m[e][m], gain_boost);
482 }
483 }
484 }
485 3787 }
486
487 /// Assembling HF Signals (14496-3 sp04 p220)
488 3787 static void sbr_hf_assemble(int Y1[38][64][2],
489 const int X_high[64][40][2],
490 SpectralBandReplication *sbr, SBRData *ch_data,
491 const int e_a[2])
492 {
493 int e, i, j, m;
494
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 3787 const int h_SL = 4 * !sbr->bs_smoothing_mode;
495 3787 const int kx = sbr->kx[1];
496 3787 const int m_max = sbr->m[1];
497 static const SoftFloat h_smooth[5] = {
498 { 715827883, -1 },
499 { 647472402, -1 },
500 { 937030863, -2 },
501 { 989249804, -3 },
502 { 546843842, -4 },
503 };
504 3787 SoftFloat (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
505 3787 int indexnoise = ch_data->f_indexnoise;
506 3787 int indexsine = ch_data->f_indexsine;
507
508
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 3787 if (sbr->reset) {
509
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 17 for (i = 0; i < h_SL; i++) {
510 8 memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
511 8 memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
512 }
513
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 3778 } else if (h_SL) {
514
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 5730 for (i = 0; i < 4; i++) {
515 4584 memcpy(g_temp[i + 2 * ch_data->t_env[0]],
516 4584 g_temp[i + 2 * ch_data->t_env_num_env_old],
517 sizeof(g_temp[0]));
518 4584 memcpy(q_temp[i + 2 * ch_data->t_env[0]],
519 4584 q_temp[i + 2 * ch_data->t_env_num_env_old],
520 sizeof(q_temp[0]));
521 }
522 }
523
524
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 9375 for (e = 0; e < ch_data->bs_num_env; e++) {
525
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 126772 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
526 121184 memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
527 121184 memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
528 }
529 }
530
531
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 9375 for (e = 0; e < ch_data->bs_num_env; e++) {
532
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 126772 for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
533 SoftFloat g_filt_tab[48];
534 SoftFloat q_filt_tab[48];
535 SoftFloat *g_filt, *q_filt;
536
537
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 121184 if (h_SL && e != e_a[0] && e != e_a[1]) {
538 36634 g_filt = g_filt_tab;
539 36634 q_filt = q_filt_tab;
540
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 659412 for (m = 0; m < m_max; m++) {
541 622778 const int idx1 = i + h_SL;
542 622778 g_filt[m].mant = g_filt[m].exp = 0;
543 622778 q_filt[m].mant = q_filt[m].exp = 0;
544
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 3736668 for (j = 0; j <= h_SL; j++) {
545 3113890 g_filt[m] = av_add_sf(g_filt[m],
546 3113890 av_mul_sf(g_temp[idx1 - j][m],
547 h_smooth[j]));
548 3113890 q_filt[m] = av_add_sf(q_filt[m],
549 3113890 av_mul_sf(q_temp[idx1 - j][m],
550 h_smooth[j]));
551 }
552 }
553 } else {
554 84550 g_filt = g_temp[i + h_SL];
555 84550 q_filt = q_temp[i];
556 }
557
558 121184 sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,
559 121184 i + ENVELOPE_ADJUSTMENT_OFFSET);
560
561
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 121184 if (e != e_a[0] && e != e_a[1]) {
562 119686 sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],
563 q_filt, indexnoise,
564 kx, m_max);
565 } else {
566 1498 int idx = indexsine&1;
567 1498 int A = (1-((indexsine+(kx & 1))&2));
568 1498 int B = (A^(-idx)) + idx;
569 1498 unsigned *out = &Y1[i][kx][idx];
570 int shift;
571 unsigned round;
572
573 1498 SoftFloat *in = sbr->s_m[e];
574
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 18898 for (m = 0; m+1 < m_max; m+=2) {
575 int shift2;
576 17400 shift = 22 - in[m ].exp;
577 17400 shift2= 22 - in[m+1].exp;
578
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 17400 if (shift < 1 || shift2 < 1) {
579 ✗ av_log(NULL, AV_LOG_ERROR, "Overflow in sbr_hf_assemble, shift=%d,%d\n", shift, shift2);
580 ✗ return;
581 }
582
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 17400 if (shift < 32) {
583 600 round = 1 << (shift-1);
584 600 out[2*m ] += (int)(in[m ].mant * A + round) >> shift;
585 }
586
587
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 17400 if (shift2 < 32) {
588 152 round = 1 << (shift2-1);
589 152 out[2*m+2] += (int)(in[m+1].mant * B + round) >> shift2;
590 }
591 }
592
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 1498 if(m_max&1)
593 {
594 1004 shift = 22 - in[m ].exp;
595
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 1004 if (shift < 1) {
596 ✗ av_log(NULL, AV_LOG_ERROR, "Overflow in sbr_hf_assemble, shift=%d\n", shift);
597 ✗ return;
598
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 1004 } else if (shift < 32) {
599 ✗ round = 1 << (shift-1);
600 ✗ out[2*m ] += (int)(in[m ].mant * A + round) >> shift;
601 }
602 }
603 }
604 121184 indexnoise = (indexnoise + m_max) & 0x1ff;
605 121184 indexsine = (indexsine + 1) & 3;
606 }
607 }
608 3787 ch_data->f_indexnoise = indexnoise;
609 3787 ch_data->f_indexsine = indexsine;
610 }
611
612 #include "aacsbr_template.c"
613