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 <math.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24
25 #include <ixheaacd_type_def.h>
26 #include <ixheaacd_interface.h>
27
28 #include "ixheaacd_bitbuffer.h"
29 #include "ixheaacd_interface.h"
30
31 #include "ixheaacd_tns_usac.h"
32 #include "ixheaacd_cnst.h"
33 #include "ixheaacd_acelp_info.h"
34
35 #include "ixheaacd_td_mdct.h"
36
37 #include "ixheaacd_sbrdecsettings.h"
38 #include "ixheaacd_info.h"
39 #include "ixheaacd_sbr_common.h"
40 #include "ixheaacd_drc_data_struct.h"
41 #include "ixheaacd_drc_dec.h"
42 #include "ixheaacd_sbrdecoder.h"
43 #include "ixheaacd_mps_polyphase.h"
44 #include "ixheaacd_sbr_const.h"
45 #include "ixheaacd_main.h"
46 #include "ixheaacd_arith_dec.h"
47 #include "ixheaacd_windows.h"
48
49 #include "ixheaacd_vec_baisc_ops.h"
50 #include "ixheaacd_constants.h"
51 #include "ixheaacd_function_selector.h"
52 #include <ixheaacd_type_def.h>
53 #include <ixheaacd_basic_ops32.h>
54 #include <ixheaacd_basic_ops40.h>
55
56 #include "ixheaacd_func_def.h"
57
58 #include "ixheaacd_windows.h"
59
60 extern const WORD32 ixheaacd_pre_post_twid_cos_512[512];
61 extern const WORD32 ixheaacd_pre_post_twid_sin_512[512];
62 extern const WORD32 ixheaacd_pre_post_twid_cos_384[384];
63 extern const WORD32 ixheaacd_pre_post_twid_sin_384[384];
64 extern const WORD32 ixheaacd_pre_post_twid_cos_64[64];
65 extern const WORD32 ixheaacd_pre_post_twid_sin_64[64];
66 extern const WORD32 ixheaacd_pre_post_twid_cos_48[48];
67 extern const WORD32 ixheaacd_pre_post_twid_sin_48[48];
68 extern const FLOAT64 ixheaacd_power_10_table[28];
69
70 #define ABS(A) ((A) < 0 ? (-A) : (A))
71
ixheaacd_calc_max_spectralline(WORD32 * p_in_ibuffer,WORD32 n)72 static WORD32 ixheaacd_calc_max_spectralline(WORD32 *p_in_ibuffer, WORD32 n) {
73 WORD32 k, shiftp, itemp = 0;
74 for (k = 0; k < n; k++) {
75 if (ixheaacd_abs32_sat(p_in_ibuffer[k]) > itemp)
76 itemp = ixheaacd_abs32_sat(p_in_ibuffer[k]);
77 }
78
79 shiftp = ixheaacd_norm32(itemp);
80
81 return (shiftp);
82 }
83
ixheaacd_normalize(WORD32 * buff,WORD32 shift,WORD len)84 static void ixheaacd_normalize(WORD32 *buff, WORD32 shift, WORD len) {
85 WORD32 i;
86
87 for (i = 0; i < len; i++) {
88 buff[i] = buff[i] << shift;
89 }
90 }
91
ixheaacd_pow10(WORD32 input)92 static FLOAT32 ixheaacd_pow10(WORD32 input) {
93 FLOAT32 output = 1;
94 while (input > 0) {
95 output *= 10;
96 input--;
97 }
98 return (output);
99 }
100
ixheaacd_calc_pre_twid_dec(WORD32 * ptr_x,WORD32 * r_ptr,WORD32 * i_ptr,WORD32 nlength,const WORD32 * cos_ptr,const WORD32 * sin_ptr)101 void ixheaacd_calc_pre_twid_dec(WORD32 *ptr_x, WORD32 *r_ptr, WORD32 *i_ptr,
102 WORD32 nlength, const WORD32 *cos_ptr,
103 const WORD32 *sin_ptr) {
104 WORD32 i;
105 WORD32 *ptr_y;
106
107 ptr_y = &ptr_x[2 * nlength - 1];
108
109 for (i = 0; i < nlength; i++) {
110 *r_ptr++ = ((ixheaacd_mult32(ixheaacd_negate32_sat(*ptr_x), (*cos_ptr)) -
111 ixheaacd_mult32((*ptr_y), (*sin_ptr))));
112 *i_ptr++ = ((ixheaacd_mult32((*ptr_y), (*cos_ptr++)) -
113 ixheaacd_mult32((*ptr_x), (*sin_ptr++))));
114 ptr_x += 2;
115 ptr_y -= 2;
116 }
117 }
118
ixheaacd_calc_post_twid_dec(WORD32 * xptr,WORD32 * r_ptr,WORD32 * i_ptr,WORD32 nlength,const WORD32 * cos_ptr,const WORD32 * sin_ptr)119 void ixheaacd_calc_post_twid_dec(WORD32 *xptr, WORD32 *r_ptr, WORD32 *i_ptr,
120 WORD32 nlength, const WORD32 *cos_ptr,
121 const WORD32 *sin_ptr
122
123 ) {
124 WORD32 i;
125 WORD32 *yptr;
126
127 yptr = &xptr[2 * nlength - 1];
128
129 for (i = 0; i < nlength; i++) {
130 *xptr = (-(ixheaacd_mult32((r_ptr[i]), (*cos_ptr)) -
131 ixheaacd_mult32((i_ptr[i]), (*sin_ptr))));
132 *yptr = (-(ixheaacd_mult32((i_ptr[i]), (*cos_ptr++)) +
133 ixheaacd_mult32((r_ptr[i]), (*sin_ptr++))));
134 xptr += 2;
135 yptr -= 2;
136 }
137 }
138
ixheaacd_fft_based_imdct(WORD32 * data,WORD32 npoints,WORD32 * preshift,WORD32 * tmp_data)139 static void ixheaacd_fft_based_imdct(WORD32 *data, WORD32 npoints,
140 WORD32 *preshift, WORD32 *tmp_data) {
141 WORD32 *data_r;
142 WORD32 *data_i;
143 WORD32 nlength = npoints >> 1;
144 const WORD32 *cos_ptr;
145 const WORD32 *sin_ptr;
146
147 data_r = tmp_data;
148 data_i = tmp_data + 512;
149
150 if (nlength == 512) {
151 cos_ptr = ixheaacd_pre_post_twid_cos_512;
152 sin_ptr = ixheaacd_pre_post_twid_sin_512;
153 } else if (nlength == 384) {
154 cos_ptr = ixheaacd_pre_post_twid_cos_384;
155 sin_ptr = ixheaacd_pre_post_twid_sin_384;
156 } else if (nlength == 64) {
157 cos_ptr = ixheaacd_pre_post_twid_cos_64;
158 sin_ptr = ixheaacd_pre_post_twid_sin_64;
159 } else if (nlength == 48) {
160 cos_ptr = ixheaacd_pre_post_twid_cos_48;
161 sin_ptr = ixheaacd_pre_post_twid_sin_48;
162 } else {
163 cos_ptr = ixheaacd_pre_post_twid_cos_48;
164 sin_ptr = ixheaacd_pre_post_twid_sin_48;
165 }
166
167 (*ixheaacd_calc_pre_twid)(data, data_r, data_i, nlength, cos_ptr, sin_ptr);
168 ixheaacd_complex_fft(data_r, data_i, nlength, 1, preshift);
169 (*ixheaacd_calc_post_twid)(data, data_r, data_i, nlength, cos_ptr, sin_ptr);
170 }
171
172 #define N_LONG_LEN_MAX 1024
173
ixheaacd_acelp_imdct(WORD32 * imdct_in,WORD32 npoints,WORD8 * qshift,WORD32 * tmp_data)174 void ixheaacd_acelp_imdct(WORD32 *imdct_in, WORD32 npoints, WORD8 *qshift,
175 WORD32 *tmp_data) {
176 WORD32 preshift = 0;
177 WORD32 i;
178 WORD32 k = (npoints / 2);
179
180 while (((k & 1) == 0) & (k != 1)) {
181 k = k >> 1;
182 preshift++;
183 }
184
185 if ((k != 1)) {
186 for (i = 0; i < (npoints / 2); i++) {
187 imdct_in[i] = (imdct_in[i] / 3) << 1;
188 }
189 preshift++;
190 }
191
192 ixheaacd_fft_based_imdct(imdct_in, npoints / 2, &preshift, tmp_data);
193 preshift += 2;
194 *qshift -= preshift;
195 }
196
ixheaacd_cal_fac_data(ia_usac_data_struct * usac_data,WORD32 i_ch,WORD32 n_long,WORD32 lfac,WORD32 * fac_idata)197 WORD8 ixheaacd_cal_fac_data(ia_usac_data_struct *usac_data, WORD32 i_ch,
198 WORD32 n_long, WORD32 lfac, WORD32 *fac_idata) {
199 WORD32 gain_fac, scale, k, *i_aq, itemp = 0, *izir;
200 WORD32 int_aq[ORDER + 1], intzir[2 * LEN_FRAME], x_in[FAC_LENGTH];
201 FLOAT32 gain, ztemp, ftemp, pow10, rem10;
202 FLOAT32 qfac1;
203 WORD8 qshift1, qshift2 = 0, qshift3 = 0;
204 WORD32 quo, rem, preshift = 0;
205
206 FLOAT32 *last_lpc = usac_data->lpc_prev[i_ch];
207 FLOAT32 *acelp_in = usac_data->acelp_in[i_ch];
208 WORD32 *fac_data = usac_data->fac_data[i_ch];
209 WORD32 *ptr_scratch = &usac_data->scratch_buffer[0];
210
211 quo = fac_data[0] / 28;
212 rem = fac_data[0] % 28;
213 pow10 = ixheaacd_pow10(quo);
214 rem10 = (FLOAT32)ixheaacd_power_10_table[rem];
215
216 gain = pow10 * rem10;
217 scale = (WORD32)(ixheaacd_norm32((WORD32)((ABS(gain) + 1))));
218 gain_fac = (WORD32)(gain * (FLOAT32)((WORD64)1 << scale));
219 scale += 4;
220 qfac1 = 1.0f / (gain);
221
222 if (acelp_in != NULL) {
223 izir = intzir;
224 ftemp = 0.0;
225 for (k = 0; k < n_long / 4; k++) {
226 ztemp = acelp_in[k] * (qfac1);
227 if (ABS(ztemp) > ftemp) ftemp = ABS(ztemp);
228 }
229
230 itemp = (WORD32)(ftemp);
231 qshift3 = ixheaacd_norm32(itemp);
232
233 for (k = 0; k < n_long / 4; k++) {
234 izir[k] =
235 (WORD32)((acelp_in[k] * (qfac1)) * (FLOAT32)((WORD64)1 << qshift3));
236 }
237 } else
238 izir = NULL;
239
240 if (last_lpc != NULL) {
241 ftemp = 0.0;
242 i_aq = int_aq;
243 for (k = 0; k < ORDER + 1; k++) {
244 if (ABS(last_lpc[k]) > ftemp) ftemp = ABS(last_lpc[k]);
245 }
246
247 itemp = (WORD32)(ftemp);
248 qshift2 = ixheaacd_norm32(itemp);
249
250 for (k = 0; k < ORDER + 1; k++) {
251 i_aq[k] = (WORD32)(last_lpc[k] * (FLOAT32)((WORD64)1 << qshift2));
252 }
253 } else
254 i_aq = NULL;
255
256 for (k = 0; k < lfac; k++) {
257 if (ABS(fac_data[k + 1]) > itemp) itemp = ABS(fac_data[k + 1]);
258 }
259
260 qshift1 = ixheaacd_norm32(itemp);
261
262 for (k = 0; k < lfac; k++) {
263 fac_data[k + 1] =
264 (WORD32)(fac_data[k + 1] * (FLOAT32)((WORD64)1 << qshift1));
265 }
266
267 for (k = 0; k < lfac / 2; k++) {
268 x_in[k] = fac_data[2 * k + 1];
269 x_in[lfac / 2 + k] = fac_data[lfac - 2 * k];
270 }
271
272 ixheaacd_fr_alias_cnx_fix(x_in, n_long / 4, lfac, i_aq, izir, fac_idata + 16,
273 &qshift1, qshift2, qshift3, &preshift, ptr_scratch);
274 preshift += 4;
275
276 if (acelp_in != NULL) {
277 for (k = 0; k < 2 * lfac; k++) {
278 fac_idata[k] =
279 ixheaacd_mul32_sh(fac_idata[k + 16], gain_fac, (WORD8)(scale));
280 }
281 }
282 return (qshift1 - preshift);
283 }
284
ixheaacd_fd_imdct_short(ia_usac_data_struct * usac_data,WORD32 i_ch,WORD32 * fac_data_out,offset_lengths * ixheaacd_drc_offset,WORD8 fac_q)285 static WORD32 ixheaacd_fd_imdct_short(ia_usac_data_struct *usac_data,
286 WORD32 i_ch, WORD32 *fac_data_out,
287 offset_lengths *ixheaacd_drc_offset,
288 WORD8 fac_q) {
289 FLOAT32 qfac;
290 WORD32 overlap_data_buf[2 * N_LONG_LEN_MAX] = {0};
291 WORD32 *window_short, k, *window_short_prev_ptr;
292 WORD32 *overlap_data, *fp;
293
294 WORD32 *p_overlap_ibuffer = usac_data->overlap_data_ptr[i_ch];
295 WORD32 *p_in_ibuffer = usac_data->coef_fix[i_ch];
296 FLOAT32 *p_out_buffer = usac_data->time_sample_vector[i_ch];
297 WORD32 *p_out_ibuffer = usac_data->output_data_ptr[i_ch];
298 WORD32 *scratch_mem = usac_data->scratch_buffer;
299 WORD32 td_frame_prev = usac_data->td_frame_prev[i_ch];
300 WORD32 fac_apply = usac_data->fac_data_present[i_ch];
301 WORD8 shiftp, input_q, output_q, shift_olap = 14;
302 WORD32 max_shift;
303
304 WORD32 window_select = usac_data->window_shape[i_ch];
305 WORD32 window_select_prev = usac_data->window_shape_prev[i_ch];
306 ia_usac_lpd_decoder_handle st = usac_data->str_tddec[i_ch];
307 WORD32 err_code = 0;
308
309 max_shift =
310 ixheaacd_calc_max_spectralline(p_in_ibuffer, ixheaacd_drc_offset->n_long);
311 ixheaacd_normalize(p_in_ibuffer, max_shift, ixheaacd_drc_offset->n_long);
312 shiftp = max_shift + 6;
313 input_q = shiftp;
314
315 memcpy(overlap_data_buf, p_overlap_ibuffer,
316 sizeof(WORD32) * ixheaacd_drc_offset->n_long);
317 overlap_data = overlap_data_buf;
318
319 fp = overlap_data + ixheaacd_drc_offset->n_flat_ls;
320
321 for (k = 0; k < 8; k++) {
322 shiftp = input_q;
323 ixheaacd_acelp_imdct(p_in_ibuffer + (k * ixheaacd_drc_offset->n_short),
324 2 * ixheaacd_drc_offset->n_short, &shiftp,
325 scratch_mem);
326 }
327
328 max_shift =
329 ixheaacd_calc_max_spectralline(p_in_ibuffer, ixheaacd_drc_offset->n_long);
330 ixheaacd_normalize(p_in_ibuffer, max_shift - 1, ixheaacd_drc_offset->n_long);
331 shiftp += max_shift - 1;
332
333 err_code = ixheaacd_calc_window(&window_short, ixheaacd_drc_offset->n_short,
334 window_select);
335 if (err_code == -1) return err_code;
336 err_code =
337 ixheaacd_calc_window(&window_short_prev_ptr,
338 ixheaacd_drc_offset->n_trans_ls, window_select_prev);
339 if (err_code == -1) return err_code;
340
341 if (fac_apply)
342 ixheaacd_windowing_short1(p_in_ibuffer + ixheaacd_drc_offset->n_short / 2,
343 window_short_prev_ptr, fp, ixheaacd_drc_offset,
344 shiftp, shift_olap);
345
346 else
347 ixheaacd_windowing_short2(p_in_ibuffer + ixheaacd_drc_offset->n_short / 2,
348 window_short_prev_ptr, fp, ixheaacd_drc_offset,
349 shiftp, shift_olap);
350
351 output_q = ixheaacd_windowing_short3(
352 p_in_ibuffer, window_short + ixheaacd_drc_offset->n_short - 1,
353 fp + ixheaacd_drc_offset->n_short, ixheaacd_drc_offset->n_short, shiftp,
354 shift_olap);
355 p_in_ibuffer += ixheaacd_drc_offset->n_short;
356 fp += ixheaacd_drc_offset->n_short;
357 window_short_prev_ptr = window_short;
358
359 for (k = 1; k < 7; k++) {
360 output_q = ixheaacd_windowing_short4(
361 p_in_ibuffer, window_short_prev_ptr, fp,
362 window_short_prev_ptr + ixheaacd_drc_offset->n_short - 1,
363 ixheaacd_drc_offset->n_short, 1, shiftp, shift_olap, output_q);
364 p_in_ibuffer += ixheaacd_drc_offset->n_short;
365 fp += ixheaacd_drc_offset->n_short;
366 window_short_prev_ptr = window_short;
367 }
368
369 output_q = ixheaacd_windowing_short4(
370 p_in_ibuffer, window_short_prev_ptr, fp,
371 window_short_prev_ptr + ixheaacd_drc_offset->n_short - 1,
372 ixheaacd_drc_offset->n_short, 0, shiftp, shift_olap, output_q);
373 p_in_ibuffer += ixheaacd_drc_offset->n_short;
374 fp += ixheaacd_drc_offset->n_short;
375
376 if (fac_apply) {
377 ixheaacd_combine_fac(overlap_data + ixheaacd_drc_offset->n_flat_ls +
378 ixheaacd_drc_offset->lfac,
379 fac_data_out,
380 overlap_data + ixheaacd_drc_offset->n_flat_ls +
381 ixheaacd_drc_offset->lfac,
382 2 * ixheaacd_drc_offset->lfac, output_q, fac_q);
383 }
384 memset(overlap_data + 2 * ixheaacd_drc_offset->n_long -
385 ixheaacd_drc_offset->n_flat_ls,
386 0, sizeof(WORD32) * ixheaacd_drc_offset->n_flat_ls);
387 ixheaacd_scale_down(overlap_data, overlap_data,
388 ixheaacd_drc_offset->n_flat_ls, shift_olap, output_q);
389
390 ixheaacd_scale_down(p_overlap_ibuffer,
391 overlap_data + ixheaacd_drc_offset->n_long,
392 ixheaacd_drc_offset->n_long, output_q, shift_olap);
393 ixheaacd_scale_down(p_out_ibuffer, overlap_data, ixheaacd_drc_offset->n_long,
394 output_q, 15);
395
396 if (td_frame_prev) {
397 qfac = 1.0f / (FLOAT32)(1 << 15);
398
399 for (k = 0; k < ixheaacd_drc_offset->n_long; k++) {
400 p_out_buffer[k] = ((FLOAT32)p_out_ibuffer[k]) * qfac;
401 }
402 err_code = ixheaacd_lpd_bpf_fix(usac_data, 1, p_out_buffer, st);
403 if (err_code != 0) return err_code;
404
405 for (k = 0; k < ixheaacd_drc_offset->n_long; k++) {
406 p_out_ibuffer[k] = (WORD32)(p_out_buffer[k] * (1 << 15));
407 }
408 }
409
410 return 0;
411 }
412
ixheaacd_fd_imdct_long(ia_usac_data_struct * usac_data,WORD32 i_ch,WORD32 * fac_idata,offset_lengths * ixheaacd_drc_offset,WORD8 fac_q)413 static WORD32 ixheaacd_fd_imdct_long(ia_usac_data_struct *usac_data,
414 WORD32 i_ch, WORD32 *fac_idata,
415 offset_lengths *ixheaacd_drc_offset,
416 WORD8 fac_q) {
417 FLOAT32 qfac;
418 WORD32 *window_long_prev, k, i, *window_short_prev_ptr;
419
420 WORD32 *p_in_ibuffer = usac_data->coef_fix[i_ch];
421 WORD32 *p_overlap_ibuffer = usac_data->overlap_data_ptr[i_ch];
422 WORD32 *p_out_ibuffer = usac_data->output_data_ptr[i_ch];
423 FLOAT32 *p_out_buffer = usac_data->time_sample_vector[i_ch];
424 WORD32 *scratch_mem = usac_data->scratch_buffer;
425 WORD32 n_long = usac_data->ccfl;
426 WORD32 td_frame_prev = usac_data->td_frame_prev[i_ch];
427 WORD32 fac_apply = usac_data->fac_data_present[i_ch];
428 WORD8 shiftp, output_q = 0, shift_olap = 14;
429 WORD32 max_shift;
430
431 WORD32 window_sequence = usac_data->window_sequence[i_ch];
432 WORD32 window_select_prev = usac_data->window_shape_prev[i_ch];
433 ia_usac_lpd_decoder_handle st = usac_data->str_tddec[i_ch];
434
435 WORD32 err_code = 0;
436
437 max_shift =
438 ixheaacd_calc_max_spectralline(p_in_ibuffer, ixheaacd_drc_offset->n_long);
439 ixheaacd_normalize(p_in_ibuffer, max_shift, ixheaacd_drc_offset->n_long);
440 shiftp = max_shift + 6;
441
442 ixheaacd_acelp_imdct(p_in_ibuffer, 2 * ixheaacd_drc_offset->n_long, &shiftp,
443 scratch_mem);
444
445 max_shift =
446 ixheaacd_calc_max_spectralline(p_in_ibuffer, ixheaacd_drc_offset->n_long);
447 ixheaacd_normalize(p_in_ibuffer, max_shift - 1, ixheaacd_drc_offset->n_long);
448 shiftp += max_shift - 1;
449
450 switch (window_sequence) {
451 case ONLY_LONG_SEQUENCE:
452 case LONG_START_SEQUENCE:
453 err_code = ixheaacd_calc_window(
454 &window_long_prev, ixheaacd_drc_offset->n_long, window_select_prev);
455 if (err_code == -1) return err_code;
456 output_q = ixheaacd_windowing_long1(
457 p_in_ibuffer + n_long / 2, p_overlap_ibuffer, window_long_prev,
458 window_long_prev + ixheaacd_drc_offset->n_long - 1, p_out_ibuffer,
459 ixheaacd_drc_offset->n_long, shiftp, shift_olap);
460 break;
461
462 case STOP_START_SEQUENCE:
463 case LONG_STOP_SEQUENCE:
464 err_code = ixheaacd_calc_window(&window_short_prev_ptr,
465 ixheaacd_drc_offset->n_trans_ls,
466 window_select_prev);
467 if (err_code == -1) return err_code;
468 if (fac_apply) {
469 output_q = ixheaacd_windowing_long2(
470 p_in_ibuffer + n_long / 2, window_short_prev_ptr, fac_idata,
471 p_overlap_ibuffer, p_out_ibuffer, ixheaacd_drc_offset, shiftp,
472 shift_olap, fac_q);
473 } else {
474 output_q = ixheaacd_windowing_long3(
475 p_in_ibuffer + n_long / 2, window_short_prev_ptr, p_overlap_ibuffer,
476 p_out_ibuffer,
477 window_short_prev_ptr + ixheaacd_drc_offset->n_trans_ls - 1,
478 ixheaacd_drc_offset, shiftp, shift_olap);
479 }
480 break;
481 }
482
483 for (i = 0; i < ixheaacd_drc_offset->n_long / 2; i++) {
484 p_overlap_ibuffer[ixheaacd_drc_offset->n_long / 2 + i] =
485 -p_in_ibuffer[i] >> (shiftp - shift_olap);
486 p_overlap_ibuffer[ixheaacd_drc_offset->n_long / 2 - i - 1] =
487 -p_in_ibuffer[i] >> (shiftp - shift_olap);
488 }
489
490 ixheaacd_scale_down(p_out_ibuffer, p_out_ibuffer, ixheaacd_drc_offset->n_long,
491 output_q, 15);
492
493 if (td_frame_prev) {
494 qfac = 1.0f / (FLOAT32)(1 << 15);
495
496 for (k = 0; k < ixheaacd_drc_offset->n_long; k++) {
497 p_out_buffer[k] = ((FLOAT32)p_out_ibuffer[k]) * qfac;
498 }
499 err_code = ixheaacd_lpd_bpf_fix(usac_data, 0, p_out_buffer, st);
500 if (err_code != 0) return err_code;
501
502 for (k = 0; k < ixheaacd_drc_offset->n_long; k++) {
503 p_out_ibuffer[k] = (WORD32)(p_out_buffer[k] * (1 << 15));
504 }
505 }
506
507 return 0;
508 }
509
ixheaacd_fd_frm_dec(ia_usac_data_struct * usac_data,WORD32 i_ch)510 WORD32 ixheaacd_fd_frm_dec(ia_usac_data_struct *usac_data, WORD32 i_ch) {
511 WORD32 fac_idata[2 * FAC_LENGTH + 16];
512 offset_lengths ixheaacd_drc_offset;
513 WORD8 fac_q = 0;
514 WORD32 td_frame_prev = usac_data->td_frame_prev[i_ch];
515 WORD32 fac_apply = usac_data->fac_data_present[i_ch];
516 WORD32 window_sequence = usac_data->window_sequence[i_ch];
517 ixheaacd_drc_offset.n_long = usac_data->ccfl;
518 ixheaacd_drc_offset.n_short = ixheaacd_drc_offset.n_long >> 3;
519
520 memset(fac_idata, 0, sizeof(fac_idata));
521
522 if (td_frame_prev) {
523 if (window_sequence == EIGHT_SHORT_SEQUENCE) {
524 ixheaacd_drc_offset.lfac = ixheaacd_drc_offset.n_long >> 4;
525 } else {
526 ixheaacd_drc_offset.lfac = ixheaacd_drc_offset.n_long >> 3;
527 }
528 ixheaacd_drc_offset.n_flat_ls =
529 (ixheaacd_drc_offset.n_long - (ixheaacd_drc_offset.lfac) * 2) >> 1;
530
531 ixheaacd_drc_offset.n_trans_ls = (ixheaacd_drc_offset.lfac) << 1;
532 } else {
533 ixheaacd_drc_offset.lfac = FAC_LENGTH;
534 ixheaacd_drc_offset.n_flat_ls =
535 (ixheaacd_drc_offset.n_long - ixheaacd_drc_offset.n_short) >> 1;
536 ixheaacd_drc_offset.n_trans_ls = ixheaacd_drc_offset.n_short;
537 }
538
539 if (fac_apply)
540 fac_q = ixheaacd_cal_fac_data(usac_data, i_ch, ixheaacd_drc_offset.n_long,
541 ixheaacd_drc_offset.lfac, fac_idata);
542
543 if (window_sequence != EIGHT_SHORT_SEQUENCE)
544 ixheaacd_fd_imdct_long(usac_data, i_ch, fac_idata, &ixheaacd_drc_offset,
545 fac_q);
546
547 else
548 ixheaacd_fd_imdct_short(usac_data, i_ch, fac_idata, &ixheaacd_drc_offset,
549 fac_q);
550
551 return 0;
552 }