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 <float.h>
21 #include <stdlib.h>
22 #include <stdio.h>
23 #include <math.h>
24 #include <string.h>
25
26 #include "ixheaacd_type_def.h"
27
28 #include "ixheaacd_bitbuffer.h"
29
30 #include "ixheaacd_interface.h"
31
32 #include "ixheaacd_tns_usac.h"
33 #include "ixheaacd_cnst.h"
34
35 #include "ixheaacd_acelp_info.h"
36
37 #include "ixheaacd_td_mdct.h"
38
39 #include "ixheaacd_sbrdecsettings.h"
40 #include "ixheaacd_info.h"
41 #include "ixheaacd_sbr_common.h"
42 #include "ixheaacd_drc_data_struct.h"
43 #include "ixheaacd_drc_dec.h"
44 #include "ixheaacd_sbrdecoder.h"
45 #include "ixheaacd_mps_polyphase.h"
46 #include "ixheaacd_sbr_const.h"
47 #include "ixheaacd_main.h"
48 #include "ixheaacd_arith_dec.h"
49 #include "ixheaacd_func_def.h"
50
51 #include "ixheaacd_acelp_com.h"
52
53 #define F_PIT_SHARP 0.85F
54 #define MEAN_ENER 30
55
56 extern const FLOAT32 ixheaacd_interpol_filt[INTER_LP_FIL_LEN];
57
ixheaacd_acelp_pitch_sharpening(FLOAT32 * x,WORD32 pit_lag)58 VOID ixheaacd_acelp_pitch_sharpening(FLOAT32 *x, WORD32 pit_lag) {
59 WORD32 i;
60 for (i = pit_lag; i < LEN_SUBFR; i++) {
61 x[i] += x[i - pit_lag] * F_PIT_SHARP;
62 }
63 return;
64 }
65
ixheaacd_acelp_decode_1sp_per_track(WORD32 idx_1p,WORD32 M,WORD32 ixheaacd_drc_offset,WORD32 track,FLOAT32 code_vec[])66 static VOID ixheaacd_acelp_decode_1sp_per_track(WORD32 idx_1p, WORD32 M,
67 WORD32 ixheaacd_drc_offset,
68 WORD32 track,
69 FLOAT32 code_vec[]) {
70 WORD32 sign_index, mask, m;
71 WORD32 sp_pos;
72 mask = ((1 << M) - 1);
73
74 sp_pos = (idx_1p & mask) + ixheaacd_drc_offset;
75 sign_index = ((idx_1p >> M) & 1);
76
77 m = (sp_pos << 2) + track;
78 if (sign_index == 1)
79 code_vec[m] = (code_vec[m] - 1.0f);
80 else
81 code_vec[m] = (code_vec[m] + 1.0f);
82
83 return;
84 }
85
ixheaacd_acelp_decode_2sp_per_track(WORD32 idx_2p,WORD32 M,WORD32 ixheaacd_drc_offset,WORD32 track,FLOAT32 code_vec[])86 static VOID ixheaacd_acelp_decode_2sp_per_track(WORD32 idx_2p, WORD32 M,
87 WORD32 ixheaacd_drc_offset,
88 WORD32 track,
89 FLOAT32 code_vec[]) {
90 WORD32 sign_index;
91 WORD32 mask, m0, m1;
92 WORD32 sp_pos[2];
93 mask = ((1 << M) - 1);
94
95 sp_pos[0] = (((idx_2p >> M) & mask) + ixheaacd_drc_offset);
96 sp_pos[1] = ((idx_2p & mask) + ixheaacd_drc_offset);
97
98 sign_index = (idx_2p >> 2 * M) & 1;
99
100 m0 = (sp_pos[0] << 2) + track;
101 m1 = (sp_pos[1] << 2) + track;
102
103 if ((sp_pos[1] - sp_pos[0]) < 0) {
104 if (sign_index == 1) {
105 code_vec[m0] = (code_vec[m0] - 1.0f);
106 code_vec[m1] = (code_vec[m1] + 1.0f);
107 } else {
108 code_vec[m0] = (code_vec[m0] + 1.0f);
109 code_vec[m1] = (code_vec[m1] - 1.0f);
110 }
111 } else {
112 if (sign_index == 1) {
113 code_vec[m0] = (code_vec[m0] - 1.0f);
114 code_vec[m1] = (code_vec[m1] - 1.0f);
115 } else {
116 code_vec[m0] = (code_vec[m0] + 1.0f);
117 code_vec[m1] = (code_vec[m1] + 1.0f);
118 }
119 }
120 return;
121 }
122
ixheaacd_acelp_decode_3sp_per_track(WORD32 idx_3p,WORD32 M,WORD32 ixheaacd_drc_offset,WORD32 track,FLOAT32 code_vec[])123 static VOID ixheaacd_acelp_decode_3sp_per_track(WORD32 idx_3p, WORD32 M,
124 WORD32 ixheaacd_drc_offset,
125 WORD32 track,
126 FLOAT32 code_vec[]) {
127 WORD32 j, mask, idx_2p, idx_1p;
128
129 mask = ((1 << (2 * M - 1)) - 1);
130 idx_2p = idx_3p & mask;
131 j = ixheaacd_drc_offset;
132 if (((idx_3p >> ((2 * M) - 1)) & 1) == 1) {
133 j += (1 << (M - 1));
134 }
135 ixheaacd_acelp_decode_2sp_per_track(idx_2p, M - 1, j, track, code_vec);
136 mask = ((1 << (M + 1)) - 1);
137 idx_1p = (idx_3p >> 2 * M) & mask;
138 ixheaacd_acelp_decode_1sp_per_track(idx_1p, M, ixheaacd_drc_offset, track,
139 code_vec);
140 return;
141 }
142
ixheaacd_d_acelp_decode_4sp_per_track_section(WORD32 index,WORD32 ixheaacd_drc_offset,WORD32 track,FLOAT32 code_vec[])143 static VOID ixheaacd_d_acelp_decode_4sp_per_track_section(
144 WORD32 index, WORD32 ixheaacd_drc_offset, WORD32 track,
145 FLOAT32 code_vec[]) {
146 WORD32 j, idx_2p;
147
148 idx_2p = index & 31;
149 j = ixheaacd_drc_offset;
150 if (((index >> 5) & 1) == 1) {
151 j += 4;
152 }
153 ixheaacd_acelp_decode_2sp_per_track(idx_2p, 2, j, track, code_vec);
154 idx_2p = (index >> 6) & 127;
155 ixheaacd_acelp_decode_2sp_per_track(idx_2p, 3, ixheaacd_drc_offset, track,
156 code_vec);
157 return;
158 }
159
ixheaacd_acelp_decode_4sp_per_track(WORD32 idx_4p,WORD32 track,FLOAT32 code_vec[])160 static VOID ixheaacd_acelp_decode_4sp_per_track(WORD32 idx_4p, WORD32 track,
161 FLOAT32 code_vec[]) {
162 WORD32 idx_1p, idx_2p, idx_3p;
163
164 switch ((idx_4p >> 14) & 3) {
165 case 0:
166 if (((idx_4p >> 13) & 1) == 0)
167 ixheaacd_d_acelp_decode_4sp_per_track_section(idx_4p, 0, track,
168 code_vec);
169 else
170 ixheaacd_d_acelp_decode_4sp_per_track_section(idx_4p, 8, track,
171 code_vec);
172 break;
173 case 1:
174 idx_1p = idx_4p >> 10;
175 ixheaacd_acelp_decode_1sp_per_track(idx_1p, 3, 0, track, code_vec);
176 ixheaacd_acelp_decode_3sp_per_track(idx_4p, 3, 8, track, code_vec);
177 break;
178 case 2:
179 idx_2p = idx_4p >> 7;
180 ixheaacd_acelp_decode_2sp_per_track(idx_2p, 3, 0, track, code_vec);
181 ixheaacd_acelp_decode_2sp_per_track(idx_4p, 3, 8, track, code_vec);
182 break;
183 case 3:
184 idx_3p = idx_4p >> 4;
185 ixheaacd_acelp_decode_3sp_per_track(idx_3p, 3, 0, track, code_vec);
186 ixheaacd_acelp_decode_1sp_per_track(idx_4p, 3, 8, track, code_vec);
187 break;
188 }
189 return;
190 }
191
ixheaacd_d_acelp_add_pulse(WORD32 pos[],WORD32 nb_pulse,WORD32 track,FLOAT32 code[])192 static VOID ixheaacd_d_acelp_add_pulse(WORD32 pos[], WORD32 nb_pulse,
193 WORD32 track, FLOAT32 code[]) {
194 WORD32 i, k;
195 for (k = 0; k < nb_pulse; k++) {
196 i = ((pos[k] & (16 - 1)) << 2) + track;
197 if ((pos[k] & 16) == 0) {
198 code[i] = (WORD16)(code[i] + 1.0f);
199 } else {
200 code[i] = (WORD16)(code[i] - 1.0f);
201 }
202 }
203 return;
204 }
205
ixheaacd_d_acelp_decode_1p_n1(WORD32 index,WORD32 N,WORD32 ixheaacd_drc_offset,WORD32 pos[])206 static VOID ixheaacd_d_acelp_decode_1p_n1(WORD32 index, WORD32 N,
207 WORD32 ixheaacd_drc_offset,
208 WORD32 pos[]) {
209 WORD32 i, pos1, mask;
210 mask = ((1 << N) - 1);
211
212 pos1 = ((index & mask) + ixheaacd_drc_offset);
213 i = ((index >> N) & 1);
214 if (i == 1) {
215 pos1 += 16;
216 }
217 pos[0] = pos1;
218 return;
219 }
220
ixheaacd_acelp_decode_pulses_per_track(WORD32 cb_index[],const WORD16 code_bits,FLOAT32 code_vec[])221 VOID ixheaacd_acelp_decode_pulses_per_track(WORD32 cb_index[],
222 const WORD16 code_bits,
223 FLOAT32 code_vec[]) {
224 WORD32 track_idx, index, ixheaacd_drc_offset, pos[6], i;
225 memset(code_vec, 0, 64 * sizeof(FLOAT32));
226
227 if (code_bits == 12) {
228 for (track_idx = 0; track_idx < 4; track_idx += 2) {
229 ixheaacd_drc_offset = cb_index[2 * (track_idx / 2)];
230 index = cb_index[2 * (track_idx / 2) + 1];
231 ixheaacd_d_acelp_decode_1p_n1(index, 4, 0, pos);
232 ixheaacd_d_acelp_add_pulse(
233 pos, 1, 2 * ixheaacd_drc_offset + track_idx / 2, code_vec);
234 }
235 } else if (code_bits == 16) {
236 i = 0;
237 ixheaacd_drc_offset = cb_index[i++];
238 ixheaacd_drc_offset = (ixheaacd_drc_offset == 0) ? 1 : 3;
239 for (track_idx = 0; track_idx < 4; track_idx++) {
240 if (track_idx != ixheaacd_drc_offset) {
241 index = cb_index[i++];
242 ixheaacd_d_acelp_decode_1p_n1(index, 4, 0, pos);
243 ixheaacd_d_acelp_add_pulse(pos, 1, track_idx, code_vec);
244 }
245 }
246 } else if (code_bits == 20) {
247 for (track_idx = 0; track_idx < 4; track_idx++) {
248 index = cb_index[track_idx];
249 ixheaacd_acelp_decode_1sp_per_track(index, 4, 0, track_idx, code_vec);
250 }
251 } else if (code_bits == 28) {
252 for (track_idx = 0; track_idx < 2; track_idx++) {
253 index = cb_index[track_idx];
254 ixheaacd_acelp_decode_2sp_per_track(index, 4, 0, track_idx, code_vec);
255 }
256 for (track_idx = 2; track_idx < 4; track_idx++) {
257 index = cb_index[track_idx];
258 ixheaacd_acelp_decode_1sp_per_track(index, 4, 0, track_idx, code_vec);
259 }
260 } else if (code_bits == 36) {
261 for (track_idx = 0; track_idx < 4; track_idx++) {
262 index = cb_index[track_idx];
263 ixheaacd_acelp_decode_2sp_per_track(index, 4, 0, track_idx, code_vec);
264 }
265 } else if (code_bits == 44) {
266 for (track_idx = 0; track_idx < 2; track_idx++) {
267 index = cb_index[track_idx];
268 ixheaacd_acelp_decode_3sp_per_track(index, 4, 0, track_idx, code_vec);
269 }
270 for (track_idx = 2; track_idx < 4; track_idx++) {
271 index = cb_index[track_idx];
272 ixheaacd_acelp_decode_2sp_per_track(index, 4, 0, track_idx, code_vec);
273 }
274 } else if (code_bits == 52) {
275 for (track_idx = 0; track_idx < 4; track_idx++) {
276 index = cb_index[track_idx];
277 ixheaacd_acelp_decode_3sp_per_track(index, 4, 0, track_idx, code_vec);
278 }
279 } else if (code_bits == 64) {
280 for (track_idx = 0; track_idx < 4; track_idx++) {
281 index = ((cb_index[track_idx] << 14) + cb_index[track_idx + 4]);
282 ixheaacd_acelp_decode_4sp_per_track(index, track_idx, code_vec);
283 }
284 }
285 return;
286 }
287
ixheaacd_acelp_decode_gains(WORD32 index,FLOAT32 code_vec[],FLOAT32 * pitch_gain,FLOAT32 * codebook_gain,FLOAT32 mean_exc_energy,FLOAT32 * energy)288 static void ixheaacd_acelp_decode_gains(WORD32 index, FLOAT32 code_vec[],
289 FLOAT32 *pitch_gain,
290 FLOAT32 *codebook_gain,
291 FLOAT32 mean_exc_energy,
292 FLOAT32 *energy) {
293 WORD32 i;
294 FLOAT32 avg_innov_energy, est_gain;
295 const FLOAT32 *gain_table = ixheaacd_int_leave_gain_table;
296
297 avg_innov_energy = 0.01f;
298 for (i = 0; i < LEN_SUBFR; i++) {
299 avg_innov_energy += code_vec[i] * code_vec[i];
300 }
301 *energy = avg_innov_energy;
302
303 avg_innov_energy =
304 (FLOAT32)(10.0 * log10(avg_innov_energy / (FLOAT32)LEN_SUBFR));
305
306 est_gain = mean_exc_energy - avg_innov_energy;
307
308 est_gain = (FLOAT32)pow(10.0, 0.05 * est_gain);
309 *pitch_gain = gain_table[index * 2];
310
311 *codebook_gain = gain_table[index * 2 + 1] * est_gain;
312
313 return;
314 }
315
ixheaacd_cb_exc_calc(FLOAT32 xcitation_curr[],WORD32 pitch_lag,WORD32 frac)316 static VOID ixheaacd_cb_exc_calc(FLOAT32 xcitation_curr[], WORD32 pitch_lag,
317 WORD32 frac) {
318 WORD32 i, j;
319 FLOAT32 s, *x0, *x1, *x2;
320 const FLOAT32 *c1, *c2;
321
322 x0 = &xcitation_curr[-pitch_lag];
323 frac = -frac;
324 if (frac < 0) {
325 frac += UP_SAMP;
326 x0--;
327 }
328 for (j = 0; j < LEN_SUBFR + 1; j++) {
329 x1 = x0++;
330 x2 = x1 + 1;
331 c1 = &ixheaacd_interpol_filt[frac];
332 c2 = &ixheaacd_interpol_filt[UP_SAMP - frac];
333 s = 0.0;
334 for (i = 0; i < INTER_LP_FIL_ORDER; i++, c1 += UP_SAMP, c2 += UP_SAMP) {
335 s += (*x1--) * (*c1) + (*x2++) * (*c2);
336 }
337 xcitation_curr[j] = s;
338 }
339 return;
340 }
341
ixheaacd_acelp_alias_cnx(ia_usac_data_struct * usac_data,ia_td_frame_data_struct * pstr_td_frame_data,WORD32 k,FLOAT32 lp_filt_coeff[],FLOAT32 stability_factor,ia_usac_lpd_decoder_handle st)342 WORD32 ixheaacd_acelp_alias_cnx(ia_usac_data_struct *usac_data,
343 ia_td_frame_data_struct *pstr_td_frame_data,
344 WORD32 k, FLOAT32 lp_filt_coeff[],
345 FLOAT32 stability_factor,
346 ia_usac_lpd_decoder_handle st) {
347 WORD32 i, subfr_idx;
348 WORD32 pitch_lag, pitch_lag_frac, index, pitch_flag, pitch_lag_max;
349 WORD32 pitch_lag_min = 0;
350 FLOAT32 tmp, pitch_gain, gain_code, voicing_factor, r_v, innov_energy,
351 pitch_energy, mean_ener_code;
352 FLOAT32 gain_smooth, gain_code0, cpe;
353 FLOAT32 code[LEN_SUBFR] = {0}, synth_temp[128 + 16] = {0};
354 FLOAT32 post_process_exc[LEN_SUBFR] = {0};
355 FLOAT32 gain_smooth_factor;
356 FLOAT32 *ptr_lp_filt_coeff;
357 WORD32 pitch_min;
358 WORD32 pitch_fr2;
359 WORD32 pitch_fr1;
360 WORD32 pitch_max;
361 WORD32 subfr_nb = 0;
362 static const WORD16 num_codebits_table[8] = {20, 28, 36, 44, 52, 64, 12, 16};
363 FLOAT32 x[FAC_LENGTH] = {0}, xn2[2 * FAC_LENGTH + 16] = {0};
364 WORD32 int_x[FAC_LENGTH] = {0};
365 WORD32 TTT;
366 WORD32 len_subfr = usac_data->len_subfrm;
367 WORD32 fac_length;
368 WORD8 shiftp;
369 WORD32 preshift;
370 WORD32 *ptr_scratch = &usac_data->scratch_buffer[0];
371 WORD32 *int_xn2 = &usac_data->x_ac_dec[0];
372 WORD32 loop_count = 0;
373 WORD32 core_mode = pstr_td_frame_data->acelp_core_mode;
374 FLOAT32 *synth_signal =
375 &usac_data->synth_buf[len_subfr * k + MAX_PITCH +
376 (((NUM_FRAMES * usac_data->num_subfrm) / 2) - 1) *
377 LEN_SUBFR];
378 FLOAT32 *xcitation_curr =
379 &usac_data->exc_buf[len_subfr * k + MAX_PITCH + (INTER_LP_FIL_ORDER + 1)];
380 FLOAT32 *ptr_pitch_gain =
381 &usac_data->pitch_gain[k * usac_data->num_subfrm +
382 (((NUM_FRAMES * usac_data->num_subfrm) / 2) - 1)];
383 WORD32 *ptr_pitch =
384 &usac_data->pitch[k * usac_data->num_subfrm +
385 (((NUM_FRAMES * usac_data->num_subfrm) / 2) - 1)];
386 WORD32 err = 0;
387 fac_length = len_subfr / 2;
388
389 if (st->mode_prev > 0) {
390 for (i = 0; i < fac_length / 2; i++) {
391 x[i] = st->fac_gain * pstr_td_frame_data->fac[k * FAC_LENGTH + 2 * i];
392 x[fac_length / 2 + i] =
393 st->fac_gain *
394 pstr_td_frame_data->fac[k * FAC_LENGTH + fac_length - 2 * i - 1];
395 }
396 for (i = 0; i < fac_length / 8; i++) {
397 x[i] *= st->fac_fd_data[2 * i];
398 x[fac_length - i - 1] *= st->fac_fd_data[2 * i + 1];
399 }
400
401 preshift = 0;
402 shiftp = ixheaacd_float2fix(x, int_x, fac_length);
403
404 err =
405 ixheaacd_acelp_mdct(int_x, int_xn2, &preshift, fac_length, ptr_scratch);
406 if (err == -1) return err;
407 ixheaacd_fix2float(int_xn2, xn2 + fac_length, fac_length, &shiftp,
408 &preshift);
409
410 ixheaacd_vec_cnst_mul((2.0f / (FLOAT32)fac_length), xn2 + fac_length,
411 xn2 + fac_length, fac_length);
412
413 memset(xn2, 0, fac_length * sizeof(FLOAT32));
414
415 ixheaacd_lpc_wt_synthesis_tool(st->lp_flt_coeff_a_prev, xn2 + fac_length,
416 fac_length);
417
418 for (i = 0; i < 2 * fac_length; i++)
419 xn2[i] += synth_signal[i - (2 * fac_length)];
420
421 memcpy(synth_signal - fac_length, xn2 + fac_length,
422 fac_length * sizeof(FLOAT32));
423
424 tmp = 0.0;
425 ixheaacd_preemphsis_tool_float(xn2, PREEMPH_FILT_FAC, 2 * fac_length, tmp);
426
427 ptr_lp_filt_coeff = st->lp_flt_coeff_a_prev;
428 TTT = fac_length % LEN_SUBFR;
429 if (TTT != 0) {
430 ixheaacd_residual_tool_float(
431 ptr_lp_filt_coeff, &xn2[fac_length],
432 &xcitation_curr[fac_length - (2 * fac_length)], TTT, 1);
433 ptr_lp_filt_coeff += (ORDER + 1);
434 }
435
436 loop_count = (fac_length + TTT) / LEN_SUBFR;
437 ixheaacd_residual_tool_float(ptr_lp_filt_coeff, &xn2[fac_length + TTT],
438 &xcitation_curr[TTT - fac_length], LEN_SUBFR,
439 loop_count);
440 }
441
442 for (i = 0; i < ORDER; i++)
443 synth_temp[i] = synth_signal[i - ORDER] -
444 (PREEMPH_FILT_FAC * synth_signal[i - ORDER - 1]);
445
446 i = (((st->fscale * TMIN) + (FSCALE_DENOM / 2)) / FSCALE_DENOM) - TMIN;
447 pitch_min = TMIN + i;
448 pitch_fr2 = TFR2 - i;
449 pitch_fr1 = TFR1;
450 pitch_max = TMAX + (6 * i);
451
452 ptr_lp_filt_coeff = lp_filt_coeff;
453 for (subfr_idx = 0; subfr_idx < len_subfr; subfr_idx += LEN_SUBFR) {
454 pitch_flag = subfr_idx;
455 if ((len_subfr == 256) && (subfr_idx == (2 * LEN_SUBFR))) {
456 pitch_flag = 0;
457 }
458 index = pstr_td_frame_data->acb_index[k * 4 + subfr_nb];
459
460 if (pitch_flag == 0) {
461 if (index < (pitch_fr2 - pitch_min) * 4) {
462 pitch_lag = pitch_min + (index / 4);
463 pitch_lag_frac = index - (pitch_lag - pitch_min) * 4;
464 } else if (index <
465 ((pitch_fr2 - pitch_min) * 4 + (pitch_fr1 - pitch_fr2) * 2)) {
466 index -= (pitch_fr2 - pitch_min) * 4;
467 pitch_lag = pitch_fr2 + (index / 2);
468 pitch_lag_frac = index - (pitch_lag - pitch_fr2) * 2;
469 pitch_lag_frac *= 2;
470 } else {
471 pitch_lag = index + pitch_fr1 - ((pitch_fr2 - pitch_min) * 4) -
472 ((pitch_fr1 - pitch_fr2) * 2);
473 pitch_lag_frac = 0;
474 }
475 pitch_lag_min = pitch_lag - 8;
476 if (pitch_lag_min < pitch_min) pitch_lag_min = pitch_min;
477
478 pitch_lag_max = pitch_lag_min + 15;
479 if (pitch_lag_max > pitch_max) {
480 pitch_lag_max = pitch_max;
481 pitch_lag_min = pitch_lag_max - 15;
482 }
483 } else {
484 pitch_lag = pitch_lag_min + index / 4;
485 pitch_lag_frac = index - (pitch_lag - pitch_lag_min) * 4;
486 }
487
488 ixheaacd_cb_exc_calc(&xcitation_curr[subfr_idx], pitch_lag, pitch_lag_frac);
489
490 mean_ener_code =
491 (((FLOAT32)pstr_td_frame_data->mean_energy[k]) * 12.0f) + 18.0f;
492
493 if (pstr_td_frame_data->ltp_filtering_flag[k * 4 + subfr_nb] == 0) {
494 for (i = 0; i < LEN_SUBFR; i++)
495 code[i] = (FLOAT32)(0.18 * xcitation_curr[i - 1 + subfr_idx] +
496 0.64 * xcitation_curr[i + subfr_idx] +
497 0.18 * xcitation_curr[i + 1 + subfr_idx]);
498
499 ixheaacd_mem_cpy(code, &xcitation_curr[subfr_idx], LEN_SUBFR);
500 }
501
502 ixheaacd_acelp_decode_pulses_per_track(
503 &(pstr_td_frame_data->icb_index[k * 4 + subfr_nb][0]),
504 num_codebits_table[core_mode], code);
505
506 tmp = 0.0;
507 ixheaacd_preemphsis_tool_float(code, TILT_CODE, LEN_SUBFR, tmp);
508 i = pitch_lag;
509 if (pitch_lag_frac > 2) i++;
510 if (i >= 0) ixheaacd_acelp_pitch_sharpening(code, i);
511
512 index = pstr_td_frame_data->gains[k * 4 + subfr_nb];
513
514 ixheaacd_acelp_decode_gains(index, code, &pitch_gain, &gain_code,
515 mean_ener_code, &innov_energy);
516
517 pitch_energy = 0.0;
518 for (i = 0; i < LEN_SUBFR; i++)
519 pitch_energy +=
520 xcitation_curr[i + subfr_idx] * xcitation_curr[i + subfr_idx];
521
522 pitch_energy *= (pitch_gain * pitch_gain);
523
524 innov_energy *= gain_code * gain_code;
525
526 r_v = (FLOAT32)((pitch_energy - innov_energy) /
527 (pitch_energy + innov_energy));
528
529 for (i = 0; i < LEN_SUBFR; i++)
530 post_process_exc[i] = pitch_gain * xcitation_curr[i + subfr_idx];
531
532 for (i = 0; i < LEN_SUBFR; i++)
533 xcitation_curr[i + subfr_idx] =
534 pitch_gain * xcitation_curr[i + subfr_idx] + gain_code * code[i];
535
536 i = pitch_lag;
537 if (pitch_lag_frac > 2) i++;
538
539 if (i > pitch_max) i = pitch_max;
540
541 *ptr_pitch++ = i;
542 *ptr_pitch_gain++ = pitch_gain;
543
544 voicing_factor = (FLOAT32)(0.5 * (1.0 - r_v));
545 gain_smooth_factor = stability_factor * voicing_factor;
546 gain_code0 = gain_code;
547 if (gain_code0 < st->gain_threshold) {
548 gain_code0 = (FLOAT32)(gain_code0 * 1.19);
549 if (gain_code0 > st->gain_threshold) gain_code0 = st->gain_threshold;
550 } else {
551 gain_code0 = (FLOAT32)(gain_code0 / 1.19);
552 if (gain_code0 < st->gain_threshold) gain_code0 = st->gain_threshold;
553 }
554 st->gain_threshold = gain_code0;
555 gain_smooth = (FLOAT32)((gain_smooth_factor * gain_code0) +
556 ((1.0 - gain_smooth_factor) * gain_code));
557 for (i = 0; i < LEN_SUBFR; i++) code[i] *= gain_smooth;
558
559 cpe = (FLOAT32)(0.125 * (1.0 + r_v));
560
561 post_process_exc[0] += code[0] - (cpe * code[1]);
562
563 for (i = 1; i < LEN_SUBFR - 1; i++)
564 post_process_exc[i] += code[i] - (cpe * (code[i - 1] + code[i + 1]));
565
566 post_process_exc[LEN_SUBFR - 1] +=
567 code[LEN_SUBFR - 1] - (cpe * code[LEN_SUBFR - 2]);
568
569 ixheaacd_synthesis_tool_float(ptr_lp_filt_coeff, post_process_exc,
570 &synth_signal[subfr_idx], LEN_SUBFR,
571 synth_temp);
572 memcpy(synth_temp, &synth_signal[subfr_idx + LEN_SUBFR - ORDER],
573 ORDER * sizeof(FLOAT32));
574
575 ptr_lp_filt_coeff += (ORDER + 1);
576 subfr_nb++;
577 }
578
579 ixheaacd_deemphsis_tool(synth_signal, len_subfr, synth_signal[-1]);
580
581 memset(synth_temp + 16, 0, 128 * sizeof(FLOAT32));
582 ixheaacd_synthesis_tool_float1(ptr_lp_filt_coeff, synth_temp + 16, 128);
583
584 ptr_lp_filt_coeff -= (2 * (ORDER + 1));
585 memcpy(st->lp_flt_coeff_a_prev, ptr_lp_filt_coeff,
586 (2 * (ORDER + 1)) * sizeof(FLOAT32));
587
588 memcpy(st->exc_prev, synth_signal + len_subfr - (1 + fac_length),
589 (1 + fac_length) * sizeof(FLOAT32));
590
591 memcpy(st->exc_prev + 1 + fac_length, synth_temp + 16,
592 fac_length * sizeof(FLOAT32));
593 ixheaacd_deemphsis_tool(st->exc_prev + 1 + fac_length, fac_length,
594 synth_signal[len_subfr - 1]);
595
596 return err;
597 }
598