FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/opus/silk.c
Date: 2026-07-22 00:55:30
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
31 #include "libavcodec/mathops.h"
32
33 #include "opus.h"
34 #include "rc.h"
35 #include "silk.h"
36 #include "tab.h"
37
38 #define ROUND_MULL(a,b,s) (((MUL64(a, b) >> ((s) - 1)) + 1) >> 1)
39
40 typedef struct SilkFrame {
41 int coded;
42 int log_gain;
43 int16_t nlsf[16];
44 float lpc[16];
45
46 float output [2 * SILK_HISTORY];
47 float lpc_history[2 * SILK_HISTORY];
48 int primarylag;
49
50 int prev_voiced;
51 } SilkFrame;
52
53 struct SilkContext {
54 void *logctx;
55 int output_channels;
56
57 int midonly;
58 int subframes;
59 int sflength;
60 int flength;
61 int nlsf_interp_factor;
62
63 enum OpusBandwidth bandwidth;
64 int wb;
65
66 SilkFrame frame[2];
67 float prev_stereo_weights[2];
68 float stereo_weights[2];
69
70 int prev_coded_channels;
71 };
72
73 13398 static inline void silk_stabilize_lsf(int16_t nlsf[16], int order, const uint16_t min_delta[17])
74 {
75 int pass, i;
76
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 13792 for (pass = 0; pass < 20; pass++) {
77 13792 int k, min_diff = 0;
78
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 220410 for (i = 0; i < order+1; i++) {
79
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 206618 int low = i != 0 ? nlsf[i-1] : 0;
80
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 206618 int high = i != order ? nlsf[i] : 32768;
81 206618 int diff = (high - low) - (min_delta[i]);
82
83
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 206618 if (diff < min_diff) {
84 395 min_diff = diff;
85 395 k = i;
86
87
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 395 if (pass == 20)
88 ✗ break;
89 }
90 }
91
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 13792 if (min_diff == 0) /* no issues; stabilized */
92 13398 return;
93
94 /* wiggle one or two LSFs */
95
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 394 if (k == 0) {
96 /* repel away from lower bound */
97 76 nlsf[0] = min_delta[0];
98
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 318 } else if (k == order) {
99 /* repel away from higher bound */
100 ✗ nlsf[order-1] = 32768 - min_delta[order];
101 } else {
102 /* repel away from current position */
103 318 int min_center = 0, max_center = 32768, center_val;
104
105 /* lower extent */
106
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 1469 for (i = 0; i < k; i++)
107 1151 min_center += min_delta[i];
108 318 min_center += min_delta[k] >> 1;
109
110 /* upper extent */
111
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 3757 for (i = order; i > k; i--)
112 3439 max_center -= min_delta[i];
113 318 max_center -= min_delta[k] >> 1;
114
115 /* move apart */
116 318 center_val = nlsf[k - 1] + nlsf[k];
117 318 center_val = (center_val >> 1) + (center_val & 1); // rounded divide by 2
118 318 center_val = FFMIN(max_center, FFMAX(min_center, center_val));
119
120 318 nlsf[k - 1] = center_val - (min_delta[k] >> 1);
121 318 nlsf[k] = nlsf[k - 1] + min_delta[k];
122 }
123 }
124
125 /* resort to the fall-back method, the standard method for LSF stabilization */
126
127 /* sort; as the LSFs should be nearly sorted, use insertion sort */
128 ✗ for (i = 1; i < order; i++) {
129 ✗ int j, value = nlsf[i];
130 ✗ for (j = i - 1; j >= 0 && nlsf[j] > value; j--)
131 ✗ nlsf[j + 1] = nlsf[j];
132 ✗ nlsf[j + 1] = value;
133 }
134
135 /* push forwards to increase distance */
136 ✗ if (nlsf[0] < min_delta[0])
137 ✗ nlsf[0] = min_delta[0];
138 ✗ for (i = 1; i < order; i++)
139 ✗ nlsf[i] = FFMAX(nlsf[i], FFMIN(nlsf[i - 1] + min_delta[i], 32767));
140
141 /* push backwards to increase distance */
142 ✗ if (nlsf[order-1] > 32768 - min_delta[order])
143 ✗ nlsf[order-1] = 32768 - min_delta[order];
144 ✗ for (i = order-2; i >= 0; i--)
145 ✗ if (nlsf[i] > nlsf[i + 1] - min_delta[i+1])
146 ✗ nlsf[i] = nlsf[i + 1] - min_delta[i+1];
147
148 ✗ return;
149 }
150
151 15676 static inline int silk_is_lpc_stable(const int16_t lpc[16], int order)
152 {
153 15676 int k, j, DC_resp = 0;
154 int32_t lpc32[2][16]; // Q24
155 15676 int totalinvgain = 1 << 30; // 1.0 in Q30
156 15676 int32_t *row = lpc32[0], *prevrow;
157
158 /* initialize the first row for the Levinson recursion */
159
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 233666 for (k = 0; k < order; k++) {
160 217990 DC_resp += lpc[k];
161 217990 row[k] = lpc[k] * 4096;
162 }
163
164
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 15676 if (DC_resp >= 4096)
165 ✗ return 0;
166
167 /* check if prediction gain pushes any coefficients too far */
168 217917 for (k = order - 1; 1; k--) {
169 int rc; // Q31; reflection coefficient
170 int gaindiv; // Q30; inverse of the gain (the divisor)
171 int gain; // gain for this reflection coefficient
172 int fbits; // fractional bits used for the gain
173 int error; // Q29; estimate of the error of our partial estimate of 1/gaindiv
174
175
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 217917 if (FFABS(row[k]) > 16773022)
176 73 return 0;
177
178 217844 rc = -(row[k] * 128);
179 217844 gaindiv = (1 << 30) - MULH(rc, rc);
180
181 217844 totalinvgain = MULH(totalinvgain, gaindiv) << 2;
182
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 217844 if (k == 0)
183 15603 return (totalinvgain >= 107374);
184
185 /* approximate 1.0/gaindiv */
186 202241 fbits = opus_ilog(gaindiv);
187 202241 gain = ((1 << 29) - 1) / (gaindiv >> (fbits + 1 - 16)); // Q<fbits-16>
188 202241 error = (1 << 29) - MULL(gaindiv << (15 + 16 - fbits), gain, 16);
189 202241 gain = ((gain << 16) + (error * gain >> 13));
190
191 /* switch to the next row of the LPC coefficients */
192 202241 prevrow = row;
193 202241 row = lpc32[k & 1];
194
195
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 1672963 for (j = 0; j < k; j++) {
196 1470722 int x = av_sat_sub32(prevrow[j], ROUND_MULL(prevrow[k - j - 1], rc, 31));
197 1470722 int64_t tmp = ROUND_MULL(x, gain, fbits);
198
199 /* per RFC 8251 section 6, if this calculation overflows, the filter
200 is considered unstable. */
201
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 1470722 if (tmp < INT32_MIN || tmp > INT32_MAX)
202 ✗ return 0;
203
204 1470722 row[j] = (int32_t)tmp;
205 }
206 }
207 }
208
209 30934 static void silk_lsp2poly(const int32_t lsp[/* 2 * half_order - 1 */],
210 int32_t pol[/* half_order + 1 */], int half_order)
211 {
212 int i, j;
213
214 30934 pol[0] = 65536; // 1.0 in Q16
215 30934 pol[1] = -lsp[0];
216
217
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 214760 for (i = 1; i < half_order; i++) {
218 183826 pol[i + 1] = pol[i - 1] * 2 - ROUND_MULL(lsp[2 * i], pol[i], 16);
219
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 669880 for (j = i; j > 1; j--)
220 486054 pol[j] += pol[j - 2] - ROUND_MULL(lsp[2 * i], pol[j - 1], 16);
221
222 183826 pol[1] -= lsp[2 * i];
223 }
224 30934 }
225
226 15467 static void silk_lsf2lpc(const int16_t nlsf[16], float lpcf[16], int order)
227 {
228 int i, k;
229 int32_t lsp[16]; // Q17; 2*cos(LSF)
230 int32_t p[9], q[9]; // Q16
231 int32_t lpc32[16]; // Q17
232 int16_t lpc[16]; // Q12
233
234 /* convert the LSFs to LSPs, i.e. 2*cos(LSF) */
235
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 230227 for (k = 0; k < order; k++) {
236 214760 int index = nlsf[k] >> 8;
237 214760 int offset = nlsf[k] & 255;
238
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 214760 int k2 = (order == 10) ? ff_silk_lsf_ordering_nbmb[k] : ff_silk_lsf_ordering_wb[k];
239
240 /* interpolate and round */
241 214760 lsp[k2] = ff_silk_cosine[index] * 256;
242 214760 lsp[k2] += (ff_silk_cosine[index + 1] - ff_silk_cosine[index]) * offset;
243 214760 lsp[k2] = (lsp[k2] + 4) >> 3;
244 }
245
246 15467 silk_lsp2poly(lsp , p, order >> 1);
247 15467 silk_lsp2poly(lsp + 1, q, order >> 1);
248
249 /* reconstruct A(z) */
250
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 122847 for (k = 0; k < order>>1; k++) {
251 107380 int32_t p_tmp = p[k + 1] + p[k];
252 107380 int32_t q_tmp = q[k + 1] - q[k];
253 107380 lpc32[k] = -q_tmp - p_tmp;
254 107380 lpc32[order-k-1] = q_tmp - p_tmp;
255 }
256
257 /* limit the range of the LPC coefficients to each fit within an int16_t */
258
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 15467 for (i = 0; i < 10; i++) {
259 int j;
260 15467 unsigned int maxabs = 0;
261
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 230227 for (j = 0, k = 0; j < order; j++) {
262 214760 unsigned int x = FFABS(lpc32[k]);
263
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 214760 if (x > maxabs) {
264 15467 maxabs = x; // Q17
265 15467 k = j;
266 }
267 }
268
269 15467 maxabs = (maxabs + 16) >> 5; // convert to Q12
270
271
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 15467 if (maxabs > 32767) {
272 /* perform bandwidth expansion */
273 unsigned int chirp, chirp_base; // Q16
274 ✗ maxabs = FFMIN(maxabs, 163838); // anything above this overflows chirp's numerator
275 ✗ chirp_base = chirp = 65470 - ((maxabs - 32767) << 14) / ((maxabs * (k+1)) >> 2);
276
277 ✗ for (k = 0; k < order; k++) {
278 ✗ lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16);
279 ✗ chirp = (chirp_base * chirp + 32768) >> 16;
280 }
281 15467 } else break;
282 }
283
284
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 15467 if (i == 10) {
285 /* time's up: just clamp */
286 ✗ for (k = 0; k < order; k++) {
287 ✗ int x = (lpc32[k] + 16) >> 5;
288 ✗ lpc[k] = av_clip_int16(x);
289 ✗ lpc32[k] = lpc[k] << 5; // shortcut mandated by the spec; drops lower 5 bits
290 }
291 } else {
292
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 230227 for (k = 0; k < order; k++)
293 214760 lpc[k] = (lpc32[k] + 16) >> 5;
294 }
295
296 /* if the prediction gain causes the LPC filter to become unstable,
297 apply further bandwidth expansion on the Q17 coefficients */
298
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 15676 for (i = 1; i <= 16 && !silk_is_lpc_stable(lpc, order); i++) {
299 unsigned int chirp, chirp_base;
300 209 chirp_base = chirp = 65536 - (1 << i);
301
302
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 3439 for (k = 0; k < order; k++) {
303 3230 lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16);
304 3230 lpc[k] = (lpc32[k] + 16) >> 5;
305 3230 chirp = (chirp_base * chirp + 32768) >> 16;
306 }
307 }
308
309
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 230227 for (i = 0; i < order; i++)
310 214760 lpcf[i] = lpc[i] / 4096.0f;
311 15467 }
312
313 13398 static inline void silk_decode_lpc(SilkContext *s, SilkFrame *frame,
314 OpusRangeCoder *rc,
315 float lpc_leadin[16], float lpc[16],
316 int *lpc_order, int *has_lpc_leadin, int voiced)
317 {
318 int i;
319 int order; // order of the LP polynomial; 10 for NB/MB and 16 for WB
320 int8_t lsf_i1, lsf_i2[16]; // stage-1 and stage-2 codebook indices
321 int16_t lsf_res[16]; // residual as a Q10 value
322 int16_t nlsf[16]; // Q15
323
324
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 13398 *lpc_order = order = s->wb ? 16 : 10;
325
326 /* obtain LSF stage-1 and stage-2 indices */
327 13398 lsf_i1 = ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s1[s->wb][voiced]);
328
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 200628 for (i = 0; i < order; i++) {
329
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 187230 int index = s->wb ? ff_silk_lsf_s2_model_sel_wb [lsf_i1][i] :
330 45230 ff_silk_lsf_s2_model_sel_nbmb[lsf_i1][i];
331 187230 lsf_i2[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s2[index]) - 4;
332
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 187230 if (lsf_i2[i] == -4)
333 492 lsf_i2[i] -= ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s2_ext);
334
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 186738 else if (lsf_i2[i] == 4)
335 15 lsf_i2[i] += ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s2_ext);
336 }
337
338 /* reverse the backwards-prediction step */
339
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 200628 for (i = order - 1; i >= 0; i--) {
340
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 187230 int qstep = s->wb ? 9830 : 11796;
341
342 187230 lsf_res[i] = lsf_i2[i] * 1024;
343
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 187230 if (lsf_i2[i] < 0) lsf_res[i] += 102;
344
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 142211 else if (lsf_i2[i] > 0) lsf_res[i] -= 102;
345 187230 lsf_res[i] = (lsf_res[i] * qstep) >> 16;
346
347
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 187230 if (i + 1 < order) {
348
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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] :
349 40707 ff_silk_lsf_pred_weights_nbmb[ff_silk_lsf_weight_sel_nbmb[lsf_i1][i]][i];
350 173832 lsf_res[i] += (lsf_res[i+1] * weight) >> 8;
351 }
352 }
353
354 /* reconstruct the NLSF coefficients from the supplied indices */
355
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 200628 for (i = 0; i < order; i++) {
356
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 187230 const uint8_t * codebook = s->wb ? ff_silk_lsf_codebook_wb [lsf_i1] :
357 45230 ff_silk_lsf_codebook_nbmb[lsf_i1];
358 int cur, weight, value;
359
360 /* find the weight of the residual */
361 187230 cur = codebook[i];
362
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 187230 weight = s->wb ? ff_silk_model_lsf_weight_wb[lsf_i1][i] :
363 45230 ff_silk_model_lsf_weight_nbmb[lsf_i1][i];
364
365 187230 value = cur * 128 + (lsf_res[i] * 16384) / weight;
366 187230 nlsf[i] = av_clip_uintp2(value, 15);
367 }
368
369 /* stabilize the NLSF coefficients */
370
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 13398 silk_stabilize_lsf(nlsf, order, s->wb ? ff_silk_lsf_min_spacing_wb :
371 ff_silk_lsf_min_spacing_nbmb);
372
373 /* produce an interpolation for the first 2 subframes, */
374 /* and then convert both sets of NLSFs to LPC coefficients */
375 13398 *has_lpc_leadin = 0;
376
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 13398 if (s->subframes == 4) {
377 7717 int offset = ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_interpolation_offset);
378
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 7717 if (offset != 4 && frame->coded) {
379 2379 *has_lpc_leadin = 1;
380
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 2379 if (offset != 0) {
381 int16_t nlsf_leadin[16];
382
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 29599 for (i = 0; i < order; i++)
383 27530 nlsf_leadin[i] = frame->nlsf[i] +
384 27530 ((nlsf[i] - frame->nlsf[i]) * offset >> 2);
385 2069 silk_lsf2lpc(nlsf_leadin, lpc_leadin, order);
386 } else /* avoid re-computation for a (roughly) 1-in-4 occurrence */
387 310 memcpy(lpc_leadin, frame->lpc, 16 * sizeof(float));
388 } else
389 5338 offset = 4;
390 7717 s->nlsf_interp_factor = offset;
391
392 7717 silk_lsf2lpc(nlsf, lpc, order);
393 } else {
394 5681 s->nlsf_interp_factor = 4;
395 5681 silk_lsf2lpc(nlsf, lpc, order);
396 }
397
398 13398 memcpy(frame->nlsf, nlsf, order * sizeof(nlsf[0]));
399 13398 memcpy(frame->lpc, lpc, order * sizeof(lpc[0]));
400 13398 }
401
402 2344665 static inline void silk_count_children(OpusRangeCoder *rc, int model, int32_t total,
403 int32_t child[2])
404 {
405
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 2344665 if (total != 0) {
406 2619176 child[0] = ff_opus_rc_dec_cdf(rc,
407 1309588 ff_silk_model_pulse_location[model] + (((total - 1 + 5) * (total - 1)) >> 1));
408 1309588 child[1] = total - child[0];
409 } else {
410 1035077 child[0] = 0;
411 1035077 child[1] = 0;
412 }
413 2344665 }
414
415 13398 static inline void silk_decode_excitation(SilkContext *s, OpusRangeCoder *rc,
416 float* excitationf,
417 int qoffset_high, int active, int voiced)
418 {
419 int i;
420 uint32_t seed;
421 int shellblocks;
422 int ratelevel;
423 uint8_t pulsecount[20]; // total pulses in each shell block
424 13398 uint8_t lsbcount[20] = {0}; // raw lsbits defined for each pulse in each shell block
425 int32_t excitation[320]; // Q23
426
427 /* excitation parameters */
428 13398 seed = ff_opus_rc_dec_cdf(rc, ff_silk_model_lcg_seed);
429 13398 shellblocks = ff_silk_shell_blocks[s->bandwidth][s->subframes >> 2];
430 13398 ratelevel = ff_opus_rc_dec_cdf(rc, ff_silk_model_exc_rate[voiced]);
431
432
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 194855 for (i = 0; i < shellblocks; i++) {
433 181457 pulsecount[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_pulse_count[ratelevel]);
434
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 181457 if (pulsecount[i] == 17) {
435
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 23620 while (pulsecount[i] == 17 && ++lsbcount[i] != 10)
436 13252 pulsecount[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_pulse_count[9]);
437
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 10368 if (lsbcount[i] == 10)
438 ✗ pulsecount[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_pulse_count[10]);
439 }
440 }
441
442 /* decode pulse locations using PVQ */
443
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 194855 for (i = 0; i < shellblocks; i++) {
444
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 181457 if (pulsecount[i] != 0) {
445 int a, b, c, d;
446 156311 int32_t * location = excitation + 16*i;
447 int32_t branch[4][2];
448 156311 branch[0][0] = pulsecount[i];
449
450 /* unrolled tail recursion */
451
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 312622 for (a = 0; a < 1; a++) {
452 156311 silk_count_children(rc, 0, branch[0][a], branch[1]);
453
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 468933 for (b = 0; b < 2; b++) {
454 312622 silk_count_children(rc, 1, branch[1][b], branch[2]);
455
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 937866 for (c = 0; c < 2; c++) {
456 625244 silk_count_children(rc, 2, branch[2][c], branch[3]);
457
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 1875732 for (d = 0; d < 2; d++) {
458 1250488 silk_count_children(rc, 3, branch[3][d], location);
459 1250488 location += 2;
460 }
461 }
462 }
463 }
464 } else
465 25146 memset(excitation + 16*i, 0, 16*sizeof(int32_t));
466 }
467
468 /* decode least significant bits */
469
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 2916710 for (i = 0; i < shellblocks << 4; i++) {
470 int bit;
471
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 3115344 for (bit = 0; bit < lsbcount[i >> 4]; bit++)
472 212032 excitation[i] = (excitation[i] << 1) |
473 212032 ff_opus_rc_dec_cdf(rc, ff_silk_model_excitation_lsb);
474 }
475
476 /* decode signs */
477
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 2916710 for (i = 0; i < shellblocks << 4; i++) {
478
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 2903312 if (excitation[i] != 0) {
479 1344130 int sign = ff_opus_rc_dec_cdf(rc, ff_silk_model_excitation_sign[active +
480 672065 voiced][qoffset_high][FFMIN(pulsecount[i >> 4], 6)]);
481
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 672065 if (sign == 0)
482 446576 excitation[i] *= -1;
483 }
484 }
485
486 /* assemble the excitation */
487
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 2916710 for (i = 0; i < shellblocks << 4; i++) {
488 2903312 int value = excitation[i];
489 2903312 excitation[i] = value * 256 | ff_silk_quant_offset[voiced][qoffset_high];
490
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 2903312 if (value < 0) excitation[i] += 20;
491
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 2456736 else if (value > 0) excitation[i] -= 20;
492
493 /* invert samples pseudorandomly */
494 2903312 seed = 196314165 * seed + 907633515;
495
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 2903312 if (seed & 0x80000000)
496 1436833 excitation[i] *= -1;
497 2903312 seed += value;
498
499 2903312 excitationf[i] = excitation[i] / 8388608.0f;
500 }
501 13398 }
502
503 /** Maximum residual history according to 4.2.7.6.1 */
504 #define SILK_MAX_LAG (288 + LTP_ORDER / 2)
505
506 /** Order of the LTP filter */
507 #define LTP_ORDER 5
508
509 13398 static void silk_decode_frame(SilkContext *s, OpusRangeCoder *rc,
510 int frame_num, int channel, int coded_channels,
511 int active, int active1, int redundant)
512 {
513 /* per frame */
514 int voiced; // combines with active to indicate inactive, active, or active+voiced
515 int qoffset_high;
516 int order; // order of the LPC coefficients
517 float lpc_leadin[16], lpc_body[16], residual[SILK_MAX_LAG + SILK_HISTORY];
518 int has_lpc_leadin;
519 float ltpscale;
520
521 /* per subframe */
522 struct {
523 float gain;
524 int pitchlag;
525 float ltptaps[5];
526 } sf[4];
527
528 13398 SilkFrame * const frame = s->frame + channel;
529
530 int i;
531
532 /* obtain stereo weights */
533
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 13398 if (coded_channels == 2 && channel == 0) {
534 int n, wi[2], ws[2], w[2];
535 4678 n = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s1);
536 4678 wi[0] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s2) + 3 * (n / 5);
537 4678 ws[0] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s3);
538 4678 wi[1] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s2) + 3 * (n % 5);
539 4678 ws[1] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s3);
540
541
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 14034 for (i = 0; i < 2; i++)
542 9356 w[i] = ff_silk_stereo_weights[wi[i]] +
543 9356 (((ff_silk_stereo_weights[wi[i] + 1] - ff_silk_stereo_weights[wi[i]]) * 6554) >> 16)
544 9356 * (ws[i]*2 + 1);
545
546 4678 s->stereo_weights[0] = (w[0] - w[1]) / 8192.0;
547 4678 s->stereo_weights[1] = w[1] / 8192.0;
548
549 /* and read the mid-only flag */
550
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 4678 s->midonly = active1 ? 0 : ff_opus_rc_dec_cdf(rc, ff_silk_model_mid_only);
551 }
552
553 /* obtain frame type */
554
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 13398 if (!active) {
555 3469 qoffset_high = ff_opus_rc_dec_cdf(rc, ff_silk_model_frame_type_inactive);
556 3469 voiced = 0;
557 } else {
558 9929 int type = ff_opus_rc_dec_cdf(rc, ff_silk_model_frame_type_active);
559 9929 qoffset_high = type & 1;
560 9929 voiced = type >> 1;
561 }
562
563 /* obtain subframe quantization gains */
564
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 55628 for (i = 0; i < s->subframes; i++) {
565 int log_gain; //Q7
566 int ipart, fpart, lingain;
567
568
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 54008 if (i == 0 && (frame_num == 0 || !frame->coded)) {
569 /* gain is coded absolute */
570 11778 int x = ff_opus_rc_dec_cdf(rc, ff_silk_model_gain_highbits[active + voiced]);
571 11778 log_gain = (x<<3) | ff_opus_rc_dec_cdf(rc, ff_silk_model_gain_lowbits);
572
573
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 11778 if (frame->coded)
574
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 11724 log_gain = FFMAX(log_gain, frame->log_gain - 16);
575 } else {
576 /* gain is coded relative */
577 30452 int delta_gain = ff_opus_rc_dec_cdf(rc, ff_silk_model_gain_delta);
578
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 30452 log_gain = av_clip_uintp2(FFMAX((delta_gain<<1) - 16,
579 frame->log_gain + delta_gain - 4), 6);
580 }
581
582 42230 frame->log_gain = log_gain;
583
584 /* approximate 2**(x/128) with a Q7 (i.e. non-integer) input */
585 42230 log_gain = (log_gain * 0x1D1C71 >> 16) + 2090;
586 42230 ipart = log_gain >> 7;
587 42230 fpart = log_gain & 127;
588 42230 lingain = (1 << ipart) + ((-174 * fpart * (128-fpart) >>16) + fpart) * ((1<<ipart) >> 7);
589 42230 sf[i].gain = lingain / 65536.0f;
590 }
591
592 /* obtain LPC filter coefficients */
593 13398 silk_decode_lpc(s, frame, rc, lpc_leadin, lpc_body, &order, &has_lpc_leadin, voiced);
594
595 /* obtain pitch lags, if this is a voiced frame */
596
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 13398 if (voiced) {
597
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 4652 int lag_absolute = (!frame_num || !frame->prev_voiced);
598 int primarylag; // primary pitch lag for the entire SILK frame
599 int ltpfilter;
600 const int8_t * offsets;
601
602
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 4652 if (!lag_absolute) {
603 609 int delta = ff_opus_rc_dec_cdf(rc, ff_silk_model_pitch_delta);
604
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 609 if (delta)
605 538 primarylag = frame->primarylag + delta - 9;
606 else
607 71 lag_absolute = 1;
608 }
609
610
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 4652 if (lag_absolute) {
611 /* primary lag is coded absolute */
612 int highbits, lowbits;
613 static const uint16_t * const model[] = {
614 ff_silk_model_pitch_lowbits_nb, ff_silk_model_pitch_lowbits_mb,
615 ff_silk_model_pitch_lowbits_wb
616 };
617 4114 highbits = ff_opus_rc_dec_cdf(rc, ff_silk_model_pitch_highbits);
618 4114 lowbits = ff_opus_rc_dec_cdf(rc, model[s->bandwidth]);
619
620 4114 primarylag = ff_silk_pitch_min_lag[s->bandwidth] +
621 4114 highbits*ff_silk_pitch_scale[s->bandwidth] + lowbits;
622 }
623 4652 frame->primarylag = primarylag;
624
625
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 4652 if (s->subframes == 2)
626 1524 offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND)
627 239 ? ff_silk_pitch_offset_nb10ms[ff_opus_rc_dec_cdf(rc,
628 ff_silk_model_pitch_contour_nb10ms)]
629
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 1763 : ff_silk_pitch_offset_mbwb10ms[ff_opus_rc_dec_cdf(rc,
630 ff_silk_model_pitch_contour_mbwb10ms)];
631 else
632 3128 offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND)
633 807 ? ff_silk_pitch_offset_nb20ms[ff_opus_rc_dec_cdf(rc,
634 ff_silk_model_pitch_contour_nb20ms)]
635
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 3935 : ff_silk_pitch_offset_mbwb20ms[ff_opus_rc_dec_cdf(rc,
636 ff_silk_model_pitch_contour_mbwb20ms)];
637
638
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 20212 for (i = 0; i < s->subframes; i++)
639 15560 sf[i].pitchlag = av_clip(primarylag + offsets[i],
640 15560 ff_silk_pitch_min_lag[s->bandwidth],
641 15560 ff_silk_pitch_max_lag[s->bandwidth]);
642
643 /* obtain LTP filter coefficients */
644 4652 ltpfilter = ff_opus_rc_dec_cdf(rc, ff_silk_model_ltp_filter);
645
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 20212 for (i = 0; i < s->subframes; i++) {
646 int index, j;
647 static const uint16_t * const filter_sel[] = {
648 ff_silk_model_ltp_filter0_sel, ff_silk_model_ltp_filter1_sel,
649 ff_silk_model_ltp_filter2_sel
650 };
651 static const int8_t (* const filter_taps[])[5] = {
652 ff_silk_ltp_filter0_taps, ff_silk_ltp_filter1_taps, ff_silk_ltp_filter2_taps
653 };
654 15560 index = ff_opus_rc_dec_cdf(rc, filter_sel[ltpfilter]);
655
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 93360 for (j = 0; j < 5; j++)
656 77800 sf[i].ltptaps[j] = filter_taps[ltpfilter][index][j] / 128.0f;
657 }
658 }
659
660 /* obtain LTP scale factor */
661
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 13398 if (voiced && frame_num == 0)
662 3956 ltpscale = ff_silk_ltp_scale_factor[ff_opus_rc_dec_cdf(rc,
663 3956 ff_silk_model_ltp_scale_index)] / 16384.0f;
664 9442 else ltpscale = 15565.0f/16384.0f;
665
666 /* generate the excitation signal for the entire frame */
667 13398 silk_decode_excitation(s, rc, residual + SILK_MAX_LAG, qoffset_high,
668 active, voiced);
669
670 /* skip synthesising the output if we do not need it */
671 // TODO: implement error recovery
672
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 13398 if (s->output_channels == channel || redundant)
673 33 return;
674
675 /* generate the output signal */
676
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 55463 for (i = 0; i < s->subframes; i++) {
677
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 42098 const float * lpc_coeff = (i < 2 && has_lpc_leadin) ? lpc_leadin : lpc_body;
678 42098 float *dst = frame->output + SILK_HISTORY + i * s->sflength;
679 42098 float *resptr = residual + SILK_MAX_LAG + i * s->sflength;
680 42098 float *lpc = frame->lpc_history + SILK_HISTORY + i * s->sflength;
681 float sum;
682 int j, k;
683
684
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 42098 if (voiced) {
685 int out_end;
686 float scale;
687
688
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 15500 if (i < 2 || s->nlsf_interp_factor == 4) {
689 13602 out_end = -i * s->sflength;
690 13602 scale = ltpscale;
691 } else {
692 1898 out_end = -(i - 2) * s->sflength;
693 1898 scale = 1.0f;
694 }
695
696 /* when the LPC coefficients change, a re-whitening filter is used */
697 /* to produce a residual that accounts for the change */
698
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 672160 for (j = - sf[i].pitchlag - LTP_ORDER/2; j < out_end; j++) {
699 656660 sum = dst[j];
700
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 9968278 for (k = 0; k < order; k++)
701 9311618 sum -= lpc_coeff[k] * dst[j - k - 1];
702 656660 resptr[j] = av_clipf(sum, -1.0f, 1.0f) * scale / sf[i].gain;
703 }
704
705
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 15500 if (out_end) {
706 9914 float rescale = sf[i-1].gain / sf[i].gain;
707
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 1099614 for (j = out_end; j < 0; j++)
708 1089700 resptr[j] *= rescale;
709 }
710
711 /* LTP synthesis */
712
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 1049300 for (j = 0; j < s->sflength; j++) {
713 1033800 sum = resptr[j];
714
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 6202800 for (k = 0; k < LTP_ORDER; k++)
715 5169000 sum += sf[i].ltptaps[k] * resptr[j - sf[i].pitchlag + LTP_ORDER/2 - k];
716 1033800 resptr[j] = sum;
717 }
718 }
719
720 /* LPC synthesis */
721
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 2929858 for (j = 0; j < s->sflength; j++) {
722 2887760 sum = resptr[j] * sf[i].gain;
723
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 44536240 for (k = 1; k <= order; k++)
724 41648480 sum += lpc_coeff[k - 1] * lpc[j - k];
725
726 2887760 lpc[j] = sum;
727 2887760 dst[j] = av_clipf(sum, -1.0f, 1.0f);
728 }
729 }
730
731 13365 frame->prev_voiced = voiced;
732 13365 memmove(frame->lpc_history, frame->lpc_history + s->flength, SILK_HISTORY * sizeof(float));
733 13365 memmove(frame->output, frame->output + s->flength, SILK_HISTORY * sizeof(float));
734
735 13365 frame->coded = 1;
736 }
737
738 4645 static void silk_unmix_ms(SilkContext *s, float *l, float *r)
739 {
740 4645 float *mid = s->frame[0].output + SILK_HISTORY - s->flength;
741 4645 float *side = s->frame[1].output + SILK_HISTORY - s->flength;
742 4645 float w0_prev = s->prev_stereo_weights[0];
743 4645 float w1_prev = s->prev_stereo_weights[1];
744 4645 float w0 = s->stereo_weights[0];
745 4645 float w1 = s->stereo_weights[1];
746 4645 int n1 = ff_silk_stereo_interp_len[s->bandwidth];
747 int i;
748
749
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 528645 for (i = 0; i < n1; i++) {
750 524000 float interp0 = w0_prev + i * (w0 - w0_prev) / n1;
751 524000 float interp1 = w1_prev + i * (w1 - w1_prev) / n1;
752 524000 float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]);
753
754 524000 l[i] = av_clipf((1 + interp1) * mid[i - 1] + side[i - 1] + interp0 * p0, -1.0, 1.0);
755 524000 r[i] = av_clipf((1 - interp1) * mid[i - 1] - side[i - 1] - interp0 * p0, -1.0, 1.0);
756 }
757
758
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 437485 for (; i < s->flength; i++) {
759 432840 float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]);
760
761 432840 l[i] = av_clipf((1 + w1) * mid[i - 1] + side[i - 1] + w0 * p0, -1.0, 1.0);
762 432840 r[i] = av_clipf((1 - w1) * mid[i - 1] - side[i - 1] - w0 * p0, -1.0, 1.0);
763 }
764
765 4645 memcpy(s->prev_stereo_weights, s->stereo_weights, sizeof(s->stereo_weights));
766 4645 }
767
768 50670 static void silk_flush_frame(SilkFrame *frame)
769 {
770
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 50670 if (!frame->coded)
771 50637 return;
772
773 33 memset(frame->output, 0, sizeof(frame->output));
774 33 memset(frame->lpc_history, 0, sizeof(frame->lpc_history));
775
776 33 memset(frame->lpc, 0, sizeof(frame->lpc));
777 33 memset(frame->nlsf, 0, sizeof(frame->nlsf));
778
779 33 frame->log_gain = 0;
780
781 33 frame->primarylag = 0;
782 33 frame->prev_voiced = 0;
783 33 frame->coded = 0;
784 }
785
786 9523 int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc,
787 float *output[2],
788 enum OpusBandwidth bandwidth,
789 int coded_channels,
790 int duration_ms)
791 {
792 int active[2][6], redundancy[2];
793 int nb_frames, i, j;
794
795
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 9523 if (bandwidth > OPUS_BANDWIDTH_WIDEBAND ||
796
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 9523 coded_channels > 2 || duration_ms > 60) {
797 ✗ av_log(s->logctx, AV_LOG_ERROR, "Invalid parameters passed "
798 "to the SILK decoder.\n");
799 ✗ return AVERROR(EINVAL);
800 }
801
802
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 9523 nb_frames = 1 + (duration_ms > 20) + (duration_ms > 40);
803 9523 s->subframes = duration_ms / nb_frames / 5; // 5ms subframes
804 9523 s->sflength = 20 * (bandwidth + 2);
805 9523 s->flength = s->sflength * s->subframes;
806 9523 s->bandwidth = bandwidth;
807 9523 s->wb = bandwidth == OPUS_BANDWIDTH_WIDEBAND;
808
809 /* make sure to flush the side channel when switching from mono to stereo */
810
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 9523 if (coded_channels > s->prev_coded_channels)
811 37 silk_flush_frame(&s->frame[1]);
812 9523 s->prev_coded_channels = coded_channels;
813
814 /* read the LP-layer header bits */
815
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 23153 for (i = 0; i < coded_channels; i++) {
816
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 28880 for (j = 0; j < nb_frames; j++)
817 15250 active[i][j] = ff_opus_rc_dec_log(rc, 1);
818
819 13630 redundancy[i] = ff_opus_rc_dec_log(rc, 1);
820 }
821
822 /* read the per-frame LBRR flags */
823
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 23153 for (i = 0; i < coded_channels; i++)
824
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 13630 if (redundancy[i] && duration_ms > 20) {
825 ✗ redundancy[i] = ff_opus_rc_dec_cdf(rc, duration_ms == 40 ?
826 ff_silk_model_lbrr_flags_40 : ff_silk_model_lbrr_flags_60);
827 }
828
829 /* decode the LBRR frames */
830
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 20128 for (i = 0; i < nb_frames; i++) {
831
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 25855 for (j = 0; j < coded_channels; j++)
832
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 15250 if (redundancy[j] & (1 << i)) {
833
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 33 int active1 = (j == 0 && !(redundancy[1] & (1 << i))) ? 0 : 1;
834 33 silk_decode_frame(s, rc, i, j, coded_channels, 1, active1, 1);
835 }
836
837 10605 s->midonly = 0;
838 }
839
840
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 20128 for (i = 0; i < nb_frames; i++) {
841
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 23970 for (j = 0; j < coded_channels && !s->midonly; j++) {
842
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 13365 int active1 = coded_channels > 1 ? active[1][i] : 0;
843 13365 silk_decode_frame(s, rc, i, j, coded_channels, active[j][i], active1, 0);
844 }
845
846 /* reset the side channel if it is not coded */
847
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 10605 if (s->midonly && s->frame[1].coded)
848 13 silk_flush_frame(&s->frame[1]);
849
850
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 10605 if (coded_channels == 1 || s->output_channels == 1) {
851
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 17878 for (j = 0; j < s->output_channels; j++) {
852 11918 memcpy(output[j] + i * s->flength,
853 11918 s->frame[0].output + SILK_HISTORY - s->flength - 2,
854 11918 s->flength * sizeof(float));
855 }
856 } else {
857 4645 silk_unmix_ms(s, output[0] + i * s->flength, output[1] + i * s->flength);
858 }
859
860 10605 s->midonly = 0;
861 }
862
863 9523 return nb_frames * s->flength;
864 }
865
866 139 void ff_silk_free(SilkContext **ps)
867 {
868 139 av_freep(ps);
869 139 }
870
871 25310 void ff_silk_flush(SilkContext *s)
872 {
873 25310 silk_flush_frame(&s->frame[0]);
874 25310 silk_flush_frame(&s->frame[1]);
875
876 25310 memset(s->prev_stereo_weights, 0, sizeof(s->prev_stereo_weights));
877 25310 }
878
879 139 int ff_silk_init(void *logctx, SilkContext **ps, int output_channels)
880 {
881 SilkContext *s;
882
883
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 139 if (output_channels != 1 && output_channels != 2) {
884 ✗ av_log(logctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n",
885 output_channels);
886 ✗ return AVERROR(EINVAL);
887 }
888
889 139 s = av_mallocz(sizeof(*s));
890
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 139 if (!s)
891 ✗ return AVERROR(ENOMEM);
892
893 139 s->logctx = logctx;
894 139 s->output_channels = output_channels;
895
896 139 ff_silk_flush(s);
897
898 139 *ps = s;
899
900 139 return 0;
901 }
902