FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/opus/silk.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 397 432 91.9%
Functions: 14 14 100.0%
Branches: 267 314 85.0%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2012 Andrew D'Addesio
3 * Copyright (c) 2013-2014 Mozilla Corporation
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Opus SILK decoder
25 */
26
27 #include <stdint.h>
28
29 #include "libavutil/mem.h"
30 #include "mathops.h"
31 #include "opus.h"
32 #include "rc.h"
33 #include "silk.h"
34 #include "tab.h"
35
36 #define ROUND_MULL(a,b,s) (((MUL64(a, b) >> ((s) - 1)) + 1) >> 1)
37
38 typedef struct SilkFrame {
39 int coded;
40 int log_gain;
41 int16_t nlsf[16];
42 float lpc[16];
43
44 float output [2 * SILK_HISTORY];
45 float lpc_history[2 * SILK_HISTORY];
46 int primarylag;
47
48 int prev_voiced;
49 } SilkFrame;
50
51 struct SilkContext {
52 void *logctx;
53 int output_channels;
54
55 int midonly;
56 int subframes;
57 int sflength;
58 int flength;
59 int nlsf_interp_factor;
60
61 enum OpusBandwidth bandwidth;
62 int wb;
63
64 SilkFrame frame[2];
65 float prev_stereo_weights[2];
66 float stereo_weights[2];
67
68 int prev_coded_channels;
69 };
70
71 13398 static inline void silk_stabilize_lsf(int16_t nlsf[16], int order, const uint16_t min_delta[17])
72 {
73 int pass, i;
74
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 13792 for (pass = 0; pass < 20; pass++) {
75 13792 int k, min_diff = 0;
76
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 220410 for (i = 0; i < order+1; i++) {
77
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 206618 int low = i != 0 ? nlsf[i-1] : 0;
78
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 206618 int high = i != order ? nlsf[i] : 32768;
79 206618 int diff = (high - low) - (min_delta[i]);
80
81
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 206618 if (diff < min_diff) {
82 395 min_diff = diff;
83 395 k = i;
84
85
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 395 if (pass == 20)
86 ✗ break;
87 }
88 }
89
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 13792 if (min_diff == 0) /* no issues; stabilized */
90 13398 return;
91
92 /* wiggle one or two LSFs */
93
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 394 if (k == 0) {
94 /* repel away from lower bound */
95 76 nlsf[0] = min_delta[0];
96
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 318 } else if (k == order) {
97 /* repel away from higher bound */
98 ✗ nlsf[order-1] = 32768 - min_delta[order];
99 } else {
100 /* repel away from current position */
101 318 int min_center = 0, max_center = 32768, center_val;
102
103 /* lower extent */
104
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 1469 for (i = 0; i < k; i++)
105 1151 min_center += min_delta[i];
106 318 min_center += min_delta[k] >> 1;
107
108 /* upper extent */
109
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 3757 for (i = order; i > k; i--)
110 3439 max_center -= min_delta[i];
111 318 max_center -= min_delta[k] >> 1;
112
113 /* move apart */
114 318 center_val = nlsf[k - 1] + nlsf[k];
115 318 center_val = (center_val >> 1) + (center_val & 1); // rounded divide by 2
116 318 center_val = FFMIN(max_center, FFMAX(min_center, center_val));
117
118 318 nlsf[k - 1] = center_val - (min_delta[k] >> 1);
119 318 nlsf[k] = nlsf[k - 1] + min_delta[k];
120 }
121 }
122
123 /* resort to the fall-back method, the standard method for LSF stabilization */
124
125 /* sort; as the LSFs should be nearly sorted, use insertion sort */
126 ✗ for (i = 1; i < order; i++) {
127 ✗ int j, value = nlsf[i];
128 ✗ for (j = i - 1; j >= 0 && nlsf[j] > value; j--)
129 ✗ nlsf[j + 1] = nlsf[j];
130 ✗ nlsf[j + 1] = value;
131 }
132
133 /* push forwards to increase distance */
134 ✗ if (nlsf[0] < min_delta[0])
135 ✗ nlsf[0] = min_delta[0];
136 ✗ for (i = 1; i < order; i++)
137 ✗ nlsf[i] = FFMAX(nlsf[i], FFMIN(nlsf[i - 1] + min_delta[i], 32767));
138
139 /* push backwards to increase distance */
140 ✗ if (nlsf[order-1] > 32768 - min_delta[order])
141 ✗ nlsf[order-1] = 32768 - min_delta[order];
142 ✗ for (i = order-2; i >= 0; i--)
143 ✗ if (nlsf[i] > nlsf[i + 1] - min_delta[i+1])
144 ✗ nlsf[i] = nlsf[i + 1] - min_delta[i+1];
145
146 ✗ return;
147 }
148
149 15676 static inline int silk_is_lpc_stable(const int16_t lpc[16], int order)
150 {
151 15676 int k, j, DC_resp = 0;
152 int32_t lpc32[2][16]; // Q24
153 15676 int totalinvgain = 1 << 30; // 1.0 in Q30
154 15676 int32_t *row = lpc32[0], *prevrow;
155
156 /* initialize the first row for the Levinson recursion */
157
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 233666 for (k = 0; k < order; k++) {
158 217990 DC_resp += lpc[k];
159 217990 row[k] = lpc[k] * 4096;
160 }
161
162
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 15676 if (DC_resp >= 4096)
163 ✗ return 0;
164
165 /* check if prediction gain pushes any coefficients too far */
166 217917 for (k = order - 1; 1; k--) {
167 int rc; // Q31; reflection coefficient
168 int gaindiv; // Q30; inverse of the gain (the divisor)
169 int gain; // gain for this reflection coefficient
170 int fbits; // fractional bits used for the gain
171 int error; // Q29; estimate of the error of our partial estimate of 1/gaindiv
172
173
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 217917 if (FFABS(row[k]) > 16773022)
174 73 return 0;
175
176 217844 rc = -(row[k] * 128);
177 217844 gaindiv = (1 << 30) - MULH(rc, rc);
178
179 217844 totalinvgain = MULH(totalinvgain, gaindiv) << 2;
180
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 217844 if (k == 0)
181 15603 return (totalinvgain >= 107374);
182
183 /* approximate 1.0/gaindiv */
184 202241 fbits = opus_ilog(gaindiv);
185 202241 gain = ((1 << 29) - 1) / (gaindiv >> (fbits + 1 - 16)); // Q<fbits-16>
186 202241 error = (1 << 29) - MULL(gaindiv << (15 + 16 - fbits), gain, 16);
187 202241 gain = ((gain << 16) + (error * gain >> 13));
188
189 /* switch to the next row of the LPC coefficients */
190 202241 prevrow = row;
191 202241 row = lpc32[k & 1];
192
193
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 1672963 for (j = 0; j < k; j++) {
194 1470722 int x = av_sat_sub32(prevrow[j], ROUND_MULL(prevrow[k - j - 1], rc, 31));
195 1470722 int64_t tmp = ROUND_MULL(x, gain, fbits);
196
197 /* per RFC 8251 section 6, if this calculation overflows, the filter
198 is considered unstable. */
199
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 1470722 if (tmp < INT32_MIN || tmp > INT32_MAX)
200 ✗ return 0;
201
202 1470722 row[j] = (int32_t)tmp;
203 }
204 }
205 }
206
207 30934 static void silk_lsp2poly(const int32_t lsp[/* 2 * half_order - 1 */],
208 int32_t pol[/* half_order + 1 */], int half_order)
209 {
210 int i, j;
211
212 30934 pol[0] = 65536; // 1.0 in Q16
213 30934 pol[1] = -lsp[0];
214
215
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 214760 for (i = 1; i < half_order; i++) {
216 183826 pol[i + 1] = pol[i - 1] * 2 - ROUND_MULL(lsp[2 * i], pol[i], 16);
217
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 669880 for (j = i; j > 1; j--)
218 486054 pol[j] += pol[j - 2] - ROUND_MULL(lsp[2 * i], pol[j - 1], 16);
219
220 183826 pol[1] -= lsp[2 * i];
221 }
222 30934 }
223
224 15467 static void silk_lsf2lpc(const int16_t nlsf[16], float lpcf[16], int order)
225 {
226 int i, k;
227 int32_t lsp[16]; // Q17; 2*cos(LSF)
228 int32_t p[9], q[9]; // Q16
229 int32_t lpc32[16]; // Q17
230 int16_t lpc[16]; // Q12
231
232 /* convert the LSFs to LSPs, i.e. 2*cos(LSF) */
233
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 230227 for (k = 0; k < order; k++) {
234 214760 int index = nlsf[k] >> 8;
235 214760 int offset = nlsf[k] & 255;
236
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 214760 int k2 = (order == 10) ? ff_silk_lsf_ordering_nbmb[k] : ff_silk_lsf_ordering_wb[k];
237
238 /* interpolate and round */
239 214760 lsp[k2] = ff_silk_cosine[index] * 256;
240 214760 lsp[k2] += (ff_silk_cosine[index + 1] - ff_silk_cosine[index]) * offset;
241 214760 lsp[k2] = (lsp[k2] + 4) >> 3;
242 }
243
244 15467 silk_lsp2poly(lsp , p, order >> 1);
245 15467 silk_lsp2poly(lsp + 1, q, order >> 1);
246
247 /* reconstruct A(z) */
248
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 122847 for (k = 0; k < order>>1; k++) {
249 107380 int32_t p_tmp = p[k + 1] + p[k];
250 107380 int32_t q_tmp = q[k + 1] - q[k];
251 107380 lpc32[k] = -q_tmp - p_tmp;
252 107380 lpc32[order-k-1] = q_tmp - p_tmp;
253 }
254
255 /* limit the range of the LPC coefficients to each fit within an int16_t */
256
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 15467 for (i = 0; i < 10; i++) {
257 int j;
258 15467 unsigned int maxabs = 0;
259
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 230227 for (j = 0, k = 0; j < order; j++) {
260 214760 unsigned int x = FFABS(lpc32[k]);
261
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 214760 if (x > maxabs) {
262 15467 maxabs = x; // Q17
263 15467 k = j;
264 }
265 }
266
267 15467 maxabs = (maxabs + 16) >> 5; // convert to Q12
268
269
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 15467 if (maxabs > 32767) {
270 /* perform bandwidth expansion */
271 unsigned int chirp, chirp_base; // Q16
272 ✗ maxabs = FFMIN(maxabs, 163838); // anything above this overflows chirp's numerator
273 ✗ chirp_base = chirp = 65470 - ((maxabs - 32767) << 14) / ((maxabs * (k+1)) >> 2);
274
275 ✗ for (k = 0; k < order; k++) {
276 ✗ lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16);
277 ✗ chirp = (chirp_base * chirp + 32768) >> 16;
278 }
279 15467 } else break;
280 }
281
282
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 15467 if (i == 10) {
283 /* time's up: just clamp */
284 ✗ for (k = 0; k < order; k++) {
285 ✗ int x = (lpc32[k] + 16) >> 5;
286 ✗ lpc[k] = av_clip_int16(x);
287 ✗ lpc32[k] = lpc[k] << 5; // shortcut mandated by the spec; drops lower 5 bits
288 }
289 } else {
290
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 230227 for (k = 0; k < order; k++)
291 214760 lpc[k] = (lpc32[k] + 16) >> 5;
292 }
293
294 /* if the prediction gain causes the LPC filter to become unstable,
295 apply further bandwidth expansion on the Q17 coefficients */
296
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 15676 for (i = 1; i <= 16 && !silk_is_lpc_stable(lpc, order); i++) {
297 unsigned int chirp, chirp_base;
298 209 chirp_base = chirp = 65536 - (1 << i);
299
300
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 3439 for (k = 0; k < order; k++) {
301 3230 lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16);
302 3230 lpc[k] = (lpc32[k] + 16) >> 5;
303 3230 chirp = (chirp_base * chirp + 32768) >> 16;
304 }
305 }
306
307
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 230227 for (i = 0; i < order; i++)
308 214760 lpcf[i] = lpc[i] / 4096.0f;
309 15467 }
310
311 13398 static inline void silk_decode_lpc(SilkContext *s, SilkFrame *frame,
312 OpusRangeCoder *rc,
313 float lpc_leadin[16], float lpc[16],
314 int *lpc_order, int *has_lpc_leadin, int voiced)
315 {
316 int i;
317 int order; // order of the LP polynomial; 10 for NB/MB and 16 for WB
318 int8_t lsf_i1, lsf_i2[16]; // stage-1 and stage-2 codebook indices
319 int16_t lsf_res[16]; // residual as a Q10 value
320 int16_t nlsf[16]; // Q15
321
322
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 13398 *lpc_order = order = s->wb ? 16 : 10;
323
324 /* obtain LSF stage-1 and stage-2 indices */
325 13398 lsf_i1 = ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s1[s->wb][voiced]);
326
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 200628 for (i = 0; i < order; i++) {
327
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 187230 int index = s->wb ? ff_silk_lsf_s2_model_sel_wb [lsf_i1][i] :
328 45230 ff_silk_lsf_s2_model_sel_nbmb[lsf_i1][i];
329 187230 lsf_i2[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s2[index]) - 4;
330
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 187230 if (lsf_i2[i] == -4)
331 492 lsf_i2[i] -= ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s2_ext);
332
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 186738 else if (lsf_i2[i] == 4)
333 15 lsf_i2[i] += ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s2_ext);
334 }
335
336 /* reverse the backwards-prediction step */
337
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 200628 for (i = order - 1; i >= 0; i--) {
338
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 187230 int qstep = s->wb ? 9830 : 11796;
339
340 187230 lsf_res[i] = lsf_i2[i] * 1024;
341
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 187230 if (lsf_i2[i] < 0) lsf_res[i] += 102;
342
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 142211 else if (lsf_i2[i] > 0) lsf_res[i] -= 102;
343 187230 lsf_res[i] = (lsf_res[i] * qstep) >> 16;
344
345
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 187230 if (i + 1 < order) {
346
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 173832 int weight = s->wb ? ff_silk_lsf_pred_weights_wb [ff_silk_lsf_weight_sel_wb [lsf_i1][i]][i] :
347 40707 ff_silk_lsf_pred_weights_nbmb[ff_silk_lsf_weight_sel_nbmb[lsf_i1][i]][i];
348 173832 lsf_res[i] += (lsf_res[i+1] * weight) >> 8;
349 }
350 }
351
352 /* reconstruct the NLSF coefficients from the supplied indices */
353
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 200628 for (i = 0; i < order; i++) {
354
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 187230 const uint8_t * codebook = s->wb ? ff_silk_lsf_codebook_wb [lsf_i1] :
355 45230 ff_silk_lsf_codebook_nbmb[lsf_i1];
356 int cur, weight, value;
357
358 /* find the weight of the residual */
359 187230 cur = codebook[i];
360
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 187230 weight = s->wb ? ff_silk_model_lsf_weight_wb[lsf_i1][i] :
361 45230 ff_silk_model_lsf_weight_nbmb[lsf_i1][i];
362
363 187230 value = cur * 128 + (lsf_res[i] * 16384) / weight;
364 187230 nlsf[i] = av_clip_uintp2(value, 15);
365 }
366
367 /* stabilize the NLSF coefficients */
368
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 13398 silk_stabilize_lsf(nlsf, order, s->wb ? ff_silk_lsf_min_spacing_wb :
369 ff_silk_lsf_min_spacing_nbmb);
370
371 /* produce an interpolation for the first 2 subframes, */
372 /* and then convert both sets of NLSFs to LPC coefficients */
373 13398 *has_lpc_leadin = 0;
374
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 13398 if (s->subframes == 4) {
375 7717 int offset = ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_interpolation_offset);
376
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 7717 if (offset != 4 && frame->coded) {
377 2379 *has_lpc_leadin = 1;
378
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 2379 if (offset != 0) {
379 int16_t nlsf_leadin[16];
380
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 29599 for (i = 0; i < order; i++)
381 27530 nlsf_leadin[i] = frame->nlsf[i] +
382 27530 ((nlsf[i] - frame->nlsf[i]) * offset >> 2);
383 2069 silk_lsf2lpc(nlsf_leadin, lpc_leadin, order);
384 } else /* avoid re-computation for a (roughly) 1-in-4 occurrence */
385 310 memcpy(lpc_leadin, frame->lpc, 16 * sizeof(float));
386 } else
387 5338 offset = 4;
388 7717 s->nlsf_interp_factor = offset;
389
390 7717 silk_lsf2lpc(nlsf, lpc, order);
391 } else {
392 5681 s->nlsf_interp_factor = 4;
393 5681 silk_lsf2lpc(nlsf, lpc, order);
394 }
395
396 13398 memcpy(frame->nlsf, nlsf, order * sizeof(nlsf[0]));
397 13398 memcpy(frame->lpc, lpc, order * sizeof(lpc[0]));
398 13398 }
399
400 2344665 static inline void silk_count_children(OpusRangeCoder *rc, int model, int32_t total,
401 int32_t child[2])
402 {
403
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 2344665 if (total != 0) {
404 2619176 child[0] = ff_opus_rc_dec_cdf(rc,
405 1309588 ff_silk_model_pulse_location[model] + (((total - 1 + 5) * (total - 1)) >> 1));
406 1309588 child[1] = total - child[0];
407 } else {
408 1035077 child[0] = 0;
409 1035077 child[1] = 0;
410 }
411 2344665 }
412
413 13398 static inline void silk_decode_excitation(SilkContext *s, OpusRangeCoder *rc,
414 float* excitationf,
415 int qoffset_high, int active, int voiced)
416 {
417 int i;
418 uint32_t seed;
419 int shellblocks;
420 int ratelevel;
421 uint8_t pulsecount[20]; // total pulses in each shell block
422 13398 uint8_t lsbcount[20] = {0}; // raw lsbits defined for each pulse in each shell block
423 int32_t excitation[320]; // Q23
424
425 /* excitation parameters */
426 13398 seed = ff_opus_rc_dec_cdf(rc, ff_silk_model_lcg_seed);
427 13398 shellblocks = ff_silk_shell_blocks[s->bandwidth][s->subframes >> 2];
428 13398 ratelevel = ff_opus_rc_dec_cdf(rc, ff_silk_model_exc_rate[voiced]);
429
430
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 194855 for (i = 0; i < shellblocks; i++) {
431 181457 pulsecount[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_pulse_count[ratelevel]);
432
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 181457 if (pulsecount[i] == 17) {
433
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 23620 while (pulsecount[i] == 17 && ++lsbcount[i] != 10)
434 13252 pulsecount[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_pulse_count[9]);
435
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 10368 if (lsbcount[i] == 10)
436 ✗ pulsecount[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_pulse_count[10]);
437 }
438 }
439
440 /* decode pulse locations using PVQ */
441
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 194855 for (i = 0; i < shellblocks; i++) {
442
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 181457 if (pulsecount[i] != 0) {
443 int a, b, c, d;
444 156311 int32_t * location = excitation + 16*i;
445 int32_t branch[4][2];
446 156311 branch[0][0] = pulsecount[i];
447
448 /* unrolled tail recursion */
449
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 312622 for (a = 0; a < 1; a++) {
450 156311 silk_count_children(rc, 0, branch[0][a], branch[1]);
451
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 468933 for (b = 0; b < 2; b++) {
452 312622 silk_count_children(rc, 1, branch[1][b], branch[2]);
453
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 937866 for (c = 0; c < 2; c++) {
454 625244 silk_count_children(rc, 2, branch[2][c], branch[3]);
455
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 1875732 for (d = 0; d < 2; d++) {
456 1250488 silk_count_children(rc, 3, branch[3][d], location);
457 1250488 location += 2;
458 }
459 }
460 }
461 }
462 } else
463 25146 memset(excitation + 16*i, 0, 16*sizeof(int32_t));
464 }
465
466 /* decode least significant bits */
467
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 2916710 for (i = 0; i < shellblocks << 4; i++) {
468 int bit;
469
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 3115344 for (bit = 0; bit < lsbcount[i >> 4]; bit++)
470 212032 excitation[i] = (excitation[i] << 1) |
471 212032 ff_opus_rc_dec_cdf(rc, ff_silk_model_excitation_lsb);
472 }
473
474 /* decode signs */
475
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 2916710 for (i = 0; i < shellblocks << 4; i++) {
476
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 2903312 if (excitation[i] != 0) {
477 1344130 int sign = ff_opus_rc_dec_cdf(rc, ff_silk_model_excitation_sign[active +
478 672065 voiced][qoffset_high][FFMIN(pulsecount[i >> 4], 6)]);
479
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 672065 if (sign == 0)
480 446576 excitation[i] *= -1;
481 }
482 }
483
484 /* assemble the excitation */
485
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 2916710 for (i = 0; i < shellblocks << 4; i++) {
486 2903312 int value = excitation[i];
487 2903312 excitation[i] = value * 256 | ff_silk_quant_offset[voiced][qoffset_high];
488
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 2903312 if (value < 0) excitation[i] += 20;
489
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 2456736 else if (value > 0) excitation[i] -= 20;
490
491 /* invert samples pseudorandomly */
492 2903312 seed = 196314165 * seed + 907633515;
493
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 2903312 if (seed & 0x80000000)
494 1436833 excitation[i] *= -1;
495 2903312 seed += value;
496
497 2903312 excitationf[i] = excitation[i] / 8388608.0f;
498 }
499 13398 }
500
501 /** Maximum residual history according to 4.2.7.6.1 */
502 #define SILK_MAX_LAG (288 + LTP_ORDER / 2)
503
504 /** Order of the LTP filter */
505 #define LTP_ORDER 5
506
507 13398 static void silk_decode_frame(SilkContext *s, OpusRangeCoder *rc,
508 int frame_num, int channel, int coded_channels,
509 int active, int active1, int redundant)
510 {
511 /* per frame */
512 int voiced; // combines with active to indicate inactive, active, or active+voiced
513 int qoffset_high;
514 int order; // order of the LPC coefficients
515 float lpc_leadin[16], lpc_body[16], residual[SILK_MAX_LAG + SILK_HISTORY];
516 int has_lpc_leadin;
517 float ltpscale;
518
519 /* per subframe */
520 struct {
521 float gain;
522 int pitchlag;
523 float ltptaps[5];
524 } sf[4];
525
526 13398 SilkFrame * const frame = s->frame + channel;
527
528 int i;
529
530 /* obtain stereo weights */
531
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 13398 if (coded_channels == 2 && channel == 0) {
532 int n, wi[2], ws[2], w[2];
533 4678 n = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s1);
534 4678 wi[0] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s2) + 3 * (n / 5);
535 4678 ws[0] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s3);
536 4678 wi[1] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s2) + 3 * (n % 5);
537 4678 ws[1] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s3);
538
539
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 14034 for (i = 0; i < 2; i++)
540 9356 w[i] = ff_silk_stereo_weights[wi[i]] +
541 9356 (((ff_silk_stereo_weights[wi[i] + 1] - ff_silk_stereo_weights[wi[i]]) * 6554) >> 16)
542 9356 * (ws[i]*2 + 1);
543
544 4678 s->stereo_weights[0] = (w[0] - w[1]) / 8192.0;
545 4678 s->stereo_weights[1] = w[1] / 8192.0;
546
547 /* and read the mid-only flag */
548
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 4678 s->midonly = active1 ? 0 : ff_opus_rc_dec_cdf(rc, ff_silk_model_mid_only);
549 }
550
551 /* obtain frame type */
552
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 13398 if (!active) {
553 3469 qoffset_high = ff_opus_rc_dec_cdf(rc, ff_silk_model_frame_type_inactive);
554 3469 voiced = 0;
555 } else {
556 9929 int type = ff_opus_rc_dec_cdf(rc, ff_silk_model_frame_type_active);
557 9929 qoffset_high = type & 1;
558 9929 voiced = type >> 1;
559 }
560
561 /* obtain subframe quantization gains */
562
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 55628 for (i = 0; i < s->subframes; i++) {
563 int log_gain; //Q7
564 int ipart, fpart, lingain;
565
566
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 54008 if (i == 0 && (frame_num == 0 || !frame->coded)) {
567 /* gain is coded absolute */
568 11778 int x = ff_opus_rc_dec_cdf(rc, ff_silk_model_gain_highbits[active + voiced]);
569 11778 log_gain = (x<<3) | ff_opus_rc_dec_cdf(rc, ff_silk_model_gain_lowbits);
570
571
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 11778 if (frame->coded)
572
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 11724 log_gain = FFMAX(log_gain, frame->log_gain - 16);
573 } else {
574 /* gain is coded relative */
575 30452 int delta_gain = ff_opus_rc_dec_cdf(rc, ff_silk_model_gain_delta);
576
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 30452 log_gain = av_clip_uintp2(FFMAX((delta_gain<<1) - 16,
577 frame->log_gain + delta_gain - 4), 6);
578 }
579
580 42230 frame->log_gain = log_gain;
581
582 /* approximate 2**(x/128) with a Q7 (i.e. non-integer) input */
583 42230 log_gain = (log_gain * 0x1D1C71 >> 16) + 2090;
584 42230 ipart = log_gain >> 7;
585 42230 fpart = log_gain & 127;
586 42230 lingain = (1 << ipart) + ((-174 * fpart * (128-fpart) >>16) + fpart) * ((1<<ipart) >> 7);
587 42230 sf[i].gain = lingain / 65536.0f;
588 }
589
590 /* obtain LPC filter coefficients */
591 13398 silk_decode_lpc(s, frame, rc, lpc_leadin, lpc_body, &order, &has_lpc_leadin, voiced);
592
593 /* obtain pitch lags, if this is a voiced frame */
594
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 13398 if (voiced) {
595
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 4652 int lag_absolute = (!frame_num || !frame->prev_voiced);
596 int primarylag; // primary pitch lag for the entire SILK frame
597 int ltpfilter;
598 const int8_t * offsets;
599
600
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 4652 if (!lag_absolute) {
601 609 int delta = ff_opus_rc_dec_cdf(rc, ff_silk_model_pitch_delta);
602
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 609 if (delta)
603 538 primarylag = frame->primarylag + delta - 9;
604 else
605 71 lag_absolute = 1;
606 }
607
608
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 4652 if (lag_absolute) {
609 /* primary lag is coded absolute */
610 int highbits, lowbits;
611 static const uint16_t * const model[] = {
612 ff_silk_model_pitch_lowbits_nb, ff_silk_model_pitch_lowbits_mb,
613 ff_silk_model_pitch_lowbits_wb
614 };
615 4114 highbits = ff_opus_rc_dec_cdf(rc, ff_silk_model_pitch_highbits);
616 4114 lowbits = ff_opus_rc_dec_cdf(rc, model[s->bandwidth]);
617
618 4114 primarylag = ff_silk_pitch_min_lag[s->bandwidth] +
619 4114 highbits*ff_silk_pitch_scale[s->bandwidth] + lowbits;
620 }
621 4652 frame->primarylag = primarylag;
622
623
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 4652 if (s->subframes == 2)
624 1524 offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND)
625 239 ? ff_silk_pitch_offset_nb10ms[ff_opus_rc_dec_cdf(rc,
626 ff_silk_model_pitch_contour_nb10ms)]
627
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 1763 : ff_silk_pitch_offset_mbwb10ms[ff_opus_rc_dec_cdf(rc,
628 ff_silk_model_pitch_contour_mbwb10ms)];
629 else
630 3128 offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND)
631 807 ? ff_silk_pitch_offset_nb20ms[ff_opus_rc_dec_cdf(rc,
632 ff_silk_model_pitch_contour_nb20ms)]
633
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 3935 : ff_silk_pitch_offset_mbwb20ms[ff_opus_rc_dec_cdf(rc,
634 ff_silk_model_pitch_contour_mbwb20ms)];
635
636
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 20212 for (i = 0; i < s->subframes; i++)
637 15560 sf[i].pitchlag = av_clip(primarylag + offsets[i],
638 15560 ff_silk_pitch_min_lag[s->bandwidth],
639 15560 ff_silk_pitch_max_lag[s->bandwidth]);
640
641 /* obtain LTP filter coefficients */
642 4652 ltpfilter = ff_opus_rc_dec_cdf(rc, ff_silk_model_ltp_filter);
643
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 20212 for (i = 0; i < s->subframes; i++) {
644 int index, j;
645 static const uint16_t * const filter_sel[] = {
646 ff_silk_model_ltp_filter0_sel, ff_silk_model_ltp_filter1_sel,
647 ff_silk_model_ltp_filter2_sel
648 };
649 static const int8_t (* const filter_taps[])[5] = {
650 ff_silk_ltp_filter0_taps, ff_silk_ltp_filter1_taps, ff_silk_ltp_filter2_taps
651 };
652 15560 index = ff_opus_rc_dec_cdf(rc, filter_sel[ltpfilter]);
653
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 93360 for (j = 0; j < 5; j++)
654 77800 sf[i].ltptaps[j] = filter_taps[ltpfilter][index][j] / 128.0f;
655 }
656 }
657
658 /* obtain LTP scale factor */
659
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 13398 if (voiced && frame_num == 0)
660 3956 ltpscale = ff_silk_ltp_scale_factor[ff_opus_rc_dec_cdf(rc,
661 3956 ff_silk_model_ltp_scale_index)] / 16384.0f;
662 9442 else ltpscale = 15565.0f/16384.0f;
663
664 /* generate the excitation signal for the entire frame */
665 13398 silk_decode_excitation(s, rc, residual + SILK_MAX_LAG, qoffset_high,
666 active, voiced);
667
668 /* skip synthesising the output if we do not need it */
669 // TODO: implement error recovery
670
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 13398 if (s->output_channels == channel || redundant)
671 33 return;
672
673 /* generate the output signal */
674
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 55463 for (i = 0; i < s->subframes; i++) {
675
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 42098 const float * lpc_coeff = (i < 2 && has_lpc_leadin) ? lpc_leadin : lpc_body;
676 42098 float *dst = frame->output + SILK_HISTORY + i * s->sflength;
677 42098 float *resptr = residual + SILK_MAX_LAG + i * s->sflength;
678 42098 float *lpc = frame->lpc_history + SILK_HISTORY + i * s->sflength;
679 float sum;
680 int j, k;
681
682
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 42098 if (voiced) {
683 int out_end;
684 float scale;
685
686
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 15500 if (i < 2 || s->nlsf_interp_factor == 4) {
687 13602 out_end = -i * s->sflength;
688 13602 scale = ltpscale;
689 } else {
690 1898 out_end = -(i - 2) * s->sflength;
691 1898 scale = 1.0f;
692 }
693
694 /* when the LPC coefficients change, a re-whitening filter is used */
695 /* to produce a residual that accounts for the change */
696
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 672160 for (j = - sf[i].pitchlag - LTP_ORDER/2; j < out_end; j++) {
697 656660 sum = dst[j];
698
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 9968278 for (k = 0; k < order; k++)
699 9311618 sum -= lpc_coeff[k] * dst[j - k - 1];
700 656660 resptr[j] = av_clipf(sum, -1.0f, 1.0f) * scale / sf[i].gain;
701 }
702
703
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 15500 if (out_end) {
704 9914 float rescale = sf[i-1].gain / sf[i].gain;
705
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 1099614 for (j = out_end; j < 0; j++)
706 1089700 resptr[j] *= rescale;
707 }
708
709 /* LTP synthesis */
710
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 1049300 for (j = 0; j < s->sflength; j++) {
711 1033800 sum = resptr[j];
712
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 6202800 for (k = 0; k < LTP_ORDER; k++)
713 5169000 sum += sf[i].ltptaps[k] * resptr[j - sf[i].pitchlag + LTP_ORDER/2 - k];
714 1033800 resptr[j] = sum;
715 }
716 }
717
718 /* LPC synthesis */
719
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 2929858 for (j = 0; j < s->sflength; j++) {
720 2887760 sum = resptr[j] * sf[i].gain;
721
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 44536240 for (k = 1; k <= order; k++)
722 41648480 sum += lpc_coeff[k - 1] * lpc[j - k];
723
724 2887760 lpc[j] = sum;
725 2887760 dst[j] = av_clipf(sum, -1.0f, 1.0f);
726 }
727 }
728
729 13365 frame->prev_voiced = voiced;
730 13365 memmove(frame->lpc_history, frame->lpc_history + s->flength, SILK_HISTORY * sizeof(float));
731 13365 memmove(frame->output, frame->output + s->flength, SILK_HISTORY * sizeof(float));
732
733 13365 frame->coded = 1;
734 }
735
736 4645 static void silk_unmix_ms(SilkContext *s, float *l, float *r)
737 {
738 4645 float *mid = s->frame[0].output + SILK_HISTORY - s->flength;
739 4645 float *side = s->frame[1].output + SILK_HISTORY - s->flength;
740 4645 float w0_prev = s->prev_stereo_weights[0];
741 4645 float w1_prev = s->prev_stereo_weights[1];
742 4645 float w0 = s->stereo_weights[0];
743 4645 float w1 = s->stereo_weights[1];
744 4645 int n1 = ff_silk_stereo_interp_len[s->bandwidth];
745 int i;
746
747
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 528645 for (i = 0; i < n1; i++) {
748 524000 float interp0 = w0_prev + i * (w0 - w0_prev) / n1;
749 524000 float interp1 = w1_prev + i * (w1 - w1_prev) / n1;
750 524000 float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]);
751
752 524000 l[i] = av_clipf((1 + interp1) * mid[i - 1] + side[i - 1] + interp0 * p0, -1.0, 1.0);
753 524000 r[i] = av_clipf((1 - interp1) * mid[i - 1] - side[i - 1] - interp0 * p0, -1.0, 1.0);
754 }
755
756
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 437485 for (; i < s->flength; i++) {
757 432840 float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]);
758
759 432840 l[i] = av_clipf((1 + w1) * mid[i - 1] + side[i - 1] + w0 * p0, -1.0, 1.0);
760 432840 r[i] = av_clipf((1 - w1) * mid[i - 1] - side[i - 1] - w0 * p0, -1.0, 1.0);
761 }
762
763 4645 memcpy(s->prev_stereo_weights, s->stereo_weights, sizeof(s->stereo_weights));
764 4645 }
765
766 50254 static void silk_flush_frame(SilkFrame *frame)
767 {
768
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 50254 if (!frame->coded)
769 50221 return;
770
771 33 memset(frame->output, 0, sizeof(frame->output));
772 33 memset(frame->lpc_history, 0, sizeof(frame->lpc_history));
773
774 33 memset(frame->lpc, 0, sizeof(frame->lpc));
775 33 memset(frame->nlsf, 0, sizeof(frame->nlsf));
776
777 33 frame->log_gain = 0;
778
779 33 frame->primarylag = 0;
780 33 frame->prev_voiced = 0;
781 33 frame->coded = 0;
782 }
783
784 9523 int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc,
785 float *output[2],
786 enum OpusBandwidth bandwidth,
787 int coded_channels,
788 int duration_ms)
789 {
790 int active[2][6], redundancy[2];
791 int nb_frames, i, j;
792
793
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 9523 if (bandwidth > OPUS_BANDWIDTH_WIDEBAND ||
794
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 9523 coded_channels > 2 || duration_ms > 60) {
795 ✗ av_log(s->logctx, AV_LOG_ERROR, "Invalid parameters passed "
796 "to the SILK decoder.\n");
797 ✗ return AVERROR(EINVAL);
798 }
799
800
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 9523 nb_frames = 1 + (duration_ms > 20) + (duration_ms > 40);
801 9523 s->subframes = duration_ms / nb_frames / 5; // 5ms subframes
802 9523 s->sflength = 20 * (bandwidth + 2);
803 9523 s->flength = s->sflength * s->subframes;
804 9523 s->bandwidth = bandwidth;
805 9523 s->wb = bandwidth == OPUS_BANDWIDTH_WIDEBAND;
806
807 /* make sure to flush the side channel when switching from mono to stereo */
808
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 9523 if (coded_channels > s->prev_coded_channels)
809 37 silk_flush_frame(&s->frame[1]);
810 9523 s->prev_coded_channels = coded_channels;
811
812 /* read the LP-layer header bits */
813
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 23153 for (i = 0; i < coded_channels; i++) {
814
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 28880 for (j = 0; j < nb_frames; j++)
815 15250 active[i][j] = ff_opus_rc_dec_log(rc, 1);
816
817 13630 redundancy[i] = ff_opus_rc_dec_log(rc, 1);
818 }
819
820 /* read the per-frame LBRR flags */
821
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 23153 for (i = 0; i < coded_channels; i++)
822
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 13630 if (redundancy[i] && duration_ms > 20) {
823 ✗ redundancy[i] = ff_opus_rc_dec_cdf(rc, duration_ms == 40 ?
824 ff_silk_model_lbrr_flags_40 : ff_silk_model_lbrr_flags_60);
825 }
826
827 /* decode the LBRR frames */
828
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 20128 for (i = 0; i < nb_frames; i++) {
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 25855 for (j = 0; j < coded_channels; j++)
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 15250 if (redundancy[j] & (1 << i)) {
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 33 int active1 = (j == 0 && !(redundancy[1] & (1 << i))) ? 0 : 1;
832 33 silk_decode_frame(s, rc, i, j, coded_channels, 1, active1, 1);
833 }
834
835 10605 s->midonly = 0;
836 }
837
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 23970 for (j = 0; j < coded_channels && !s->midonly; j++) {
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 13365 int active1 = coded_channels > 1 ? active[1][i] : 0;
841 13365 silk_decode_frame(s, rc, i, j, coded_channels, active[j][i], active1, 0);
842 }
843
844 /* reset the side channel if it is not coded */
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 10605 if (s->midonly && s->frame[1].coded)
846 13 silk_flush_frame(&s->frame[1]);
847
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 10605 if (coded_channels == 1 || s->output_channels == 1) {
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 17878 for (j = 0; j < s->output_channels; j++) {
850 11918 memcpy(output[j] + i * s->flength,
851 11918 s->frame[0].output + SILK_HISTORY - s->flength - 2,
852 11918 s->flength * sizeof(float));
853 }
854 } else {
855 4645 silk_unmix_ms(s, output[0] + i * s->flength, output[1] + i * s->flength);
856 }
857
858 10605 s->midonly = 0;
859 }
860
861 9523 return nb_frames * s->flength;
862 }
863
864 135 void ff_silk_free(SilkContext **ps)
865 {
866 135 av_freep(ps);
867 135 }
868
869 25102 void ff_silk_flush(SilkContext *s)
870 {
871 25102 silk_flush_frame(&s->frame[0]);
872 25102 silk_flush_frame(&s->frame[1]);
873
874 25102 memset(s->prev_stereo_weights, 0, sizeof(s->prev_stereo_weights));
875 25102 }
876
877 135 int ff_silk_init(void *logctx, SilkContext **ps, int output_channels)
878 {
879 SilkContext *s;
880
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 135 if (output_channels != 1 && output_channels != 2) {
882 ✗ av_log(logctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n",
883 output_channels);
884 ✗ return AVERROR(EINVAL);
885 }
886
887 135 s = av_mallocz(sizeof(*s));
888
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 135 if (!s)
889 ✗ return AVERROR(ENOMEM);
890
891 135 s->logctx = logctx;
892 135 s->output_channels = output_channels;
893
894 135 ff_silk_flush(s);
895
896 135 *ps = s;
897
898 135 return 0;
899 }
900