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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 "mathops.h" | ||
30 | #include "opus.h" | ||
31 | #include "opus_rc.h" | ||
32 | #include "opus_silk.h" | ||
33 | #include "opustab.h" | ||
34 | |||
35 | #define ROUND_MULL(a,b,s) (((MUL64(a, b) >> ((s) - 1)) + 1) >> 1) | ||
36 | |||
37 | typedef struct SilkFrame { | ||
38 | int coded; | ||
39 | int log_gain; | ||
40 | int16_t nlsf[16]; | ||
41 | float lpc[16]; | ||
42 | |||
43 | float output [2 * SILK_HISTORY]; | ||
44 | float lpc_history[2 * SILK_HISTORY]; | ||
45 | int primarylag; | ||
46 | |||
47 | int prev_voiced; | ||
48 | } SilkFrame; | ||
49 | |||
50 | struct SilkContext { | ||
51 | AVCodecContext *avctx; | ||
52 | int output_channels; | ||
53 | |||
54 | int midonly; | ||
55 | int subframes; | ||
56 | int sflength; | ||
57 | int flength; | ||
58 | int nlsf_interp_factor; | ||
59 | |||
60 | enum OpusBandwidth bandwidth; | ||
61 | int wb; | ||
62 | |||
63 | SilkFrame frame[2]; | ||
64 | float prev_stereo_weights[2]; | ||
65 | float stereo_weights[2]; | ||
66 | |||
67 | int prev_coded_channels; | ||
68 | }; | ||
69 | |||
70 | 13398 | static inline void silk_stabilize_lsf(int16_t nlsf[16], int order, const uint16_t min_delta[17]) | |
71 | { | ||
72 | int pass, i; | ||
73 |
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13792 | for (pass = 0; pass < 20; pass++) { |
74 | 13792 | int k, min_diff = 0; | |
75 |
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220410 | for (i = 0; i < order+1; i++) { |
76 |
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206618 | int low = i != 0 ? nlsf[i-1] : 0; |
77 |
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206618 | int high = i != order ? nlsf[i] : 32768; |
78 | 206618 | int diff = (high - low) - (min_delta[i]); | |
79 | |||
80 |
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206618 | if (diff < min_diff) { |
81 | 395 | min_diff = diff; | |
82 | 395 | k = i; | |
83 | |||
84 |
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395 | if (pass == 20) |
85 | ✗ | break; | |
86 | } | ||
87 | } | ||
88 |
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13792 | if (min_diff == 0) /* no issues; stabilized */ |
89 | 13398 | return; | |
90 | |||
91 | /* wiggle one or two LSFs */ | ||
92 |
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394 | if (k == 0) { |
93 | /* repel away from lower bound */ | ||
94 | 76 | nlsf[0] = min_delta[0]; | |
95 |
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318 | } else if (k == order) { |
96 | /* repel away from higher bound */ | ||
97 | ✗ | nlsf[order-1] = 32768 - min_delta[order]; | |
98 | } else { | ||
99 | /* repel away from current position */ | ||
100 | 318 | int min_center = 0, max_center = 32768, center_val; | |
101 | |||
102 | /* lower extent */ | ||
103 |
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1469 | for (i = 0; i < k; i++) |
104 | 1151 | min_center += min_delta[i]; | |
105 | 318 | min_center += min_delta[k] >> 1; | |
106 | |||
107 | /* upper extent */ | ||
108 |
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3757 | for (i = order; i > k; i--) |
109 | 3439 | max_center -= min_delta[i]; | |
110 | 318 | max_center -= min_delta[k] >> 1; | |
111 | |||
112 | /* move apart */ | ||
113 | 318 | center_val = nlsf[k - 1] + nlsf[k]; | |
114 | 318 | center_val = (center_val >> 1) + (center_val & 1); // rounded divide by 2 | |
115 | 318 | center_val = FFMIN(max_center, FFMAX(min_center, center_val)); | |
116 | |||
117 | 318 | nlsf[k - 1] = center_val - (min_delta[k] >> 1); | |
118 | 318 | nlsf[k] = nlsf[k - 1] + min_delta[k]; | |
119 | } | ||
120 | } | ||
121 | |||
122 | /* resort to the fall-back method, the standard method for LSF stabilization */ | ||
123 | |||
124 | /* sort; as the LSFs should be nearly sorted, use insertion sort */ | ||
125 | ✗ | for (i = 1; i < order; i++) { | |
126 | ✗ | int j, value = nlsf[i]; | |
127 | ✗ | for (j = i - 1; j >= 0 && nlsf[j] > value; j--) | |
128 | ✗ | nlsf[j + 1] = nlsf[j]; | |
129 | ✗ | nlsf[j + 1] = value; | |
130 | } | ||
131 | |||
132 | /* push forwards to increase distance */ | ||
133 | ✗ | if (nlsf[0] < min_delta[0]) | |
134 | ✗ | nlsf[0] = min_delta[0]; | |
135 | ✗ | for (i = 1; i < order; i++) | |
136 | ✗ | nlsf[i] = FFMAX(nlsf[i], FFMIN(nlsf[i - 1] + min_delta[i], 32767)); | |
137 | |||
138 | /* push backwards to increase distance */ | ||
139 | ✗ | if (nlsf[order-1] > 32768 - min_delta[order]) | |
140 | ✗ | nlsf[order-1] = 32768 - min_delta[order]; | |
141 | ✗ | for (i = order-2; i >= 0; i--) | |
142 | ✗ | if (nlsf[i] > nlsf[i + 1] - min_delta[i+1]) | |
143 | ✗ | nlsf[i] = nlsf[i + 1] - min_delta[i+1]; | |
144 | |||
145 | ✗ | return; | |
146 | } | ||
147 | |||
148 | 15676 | static inline int silk_is_lpc_stable(const int16_t lpc[16], int order) | |
149 | { | ||
150 | 15676 | int k, j, DC_resp = 0; | |
151 | int32_t lpc32[2][16]; // Q24 | ||
152 | 15676 | int totalinvgain = 1 << 30; // 1.0 in Q30 | |
153 | 15676 | int32_t *row = lpc32[0], *prevrow; | |
154 | |||
155 | /* initialize the first row for the Levinson recursion */ | ||
156 |
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233666 | for (k = 0; k < order; k++) { |
157 | 217990 | DC_resp += lpc[k]; | |
158 | 217990 | row[k] = lpc[k] * 4096; | |
159 | } | ||
160 | |||
161 |
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15676 | if (DC_resp >= 4096) |
162 | ✗ | return 0; | |
163 | |||
164 | /* check if prediction gain pushes any coefficients too far */ | ||
165 | 217917 | for (k = order - 1; 1; k--) { | |
166 | int rc; // Q31; reflection coefficient | ||
167 | int gaindiv; // Q30; inverse of the gain (the divisor) | ||
168 | int gain; // gain for this reflection coefficient | ||
169 | int fbits; // fractional bits used for the gain | ||
170 | int error; // Q29; estimate of the error of our partial estimate of 1/gaindiv | ||
171 | |||
172 |
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217917 | if (FFABS(row[k]) > 16773022) |
173 | 73 | return 0; | |
174 | |||
175 | 217844 | rc = -(row[k] * 128); | |
176 | 217844 | gaindiv = (1 << 30) - MULH(rc, rc); | |
177 | |||
178 | 217844 | totalinvgain = MULH(totalinvgain, gaindiv) << 2; | |
179 |
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217844 | if (k == 0) |
180 | 15603 | return (totalinvgain >= 107374); | |
181 | |||
182 | /* approximate 1.0/gaindiv */ | ||
183 | 202241 | fbits = opus_ilog(gaindiv); | |
184 | 202241 | gain = ((1 << 29) - 1) / (gaindiv >> (fbits + 1 - 16)); // Q<fbits-16> | |
185 | 202241 | error = (1 << 29) - MULL(gaindiv << (15 + 16 - fbits), gain, 16); | |
186 | 202241 | gain = ((gain << 16) + (error * gain >> 13)); | |
187 | |||
188 | /* switch to the next row of the LPC coefficients */ | ||
189 | 202241 | prevrow = row; | |
190 | 202241 | row = lpc32[k & 1]; | |
191 | |||
192 |
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1672963 | for (j = 0; j < k; j++) { |
193 | 1470722 | int x = av_sat_sub32(prevrow[j], ROUND_MULL(prevrow[k - j - 1], rc, 31)); | |
194 | 1470722 | int64_t tmp = ROUND_MULL(x, gain, fbits); | |
195 | |||
196 | /* per RFC 8251 section 6, if this calculation overflows, the filter | ||
197 | is considered unstable. */ | ||
198 |
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1470722 | if (tmp < INT32_MIN || tmp > INT32_MAX) |
199 | ✗ | return 0; | |
200 | |||
201 | 1470722 | row[j] = (int32_t)tmp; | |
202 | } | ||
203 | } | ||
204 | } | ||
205 | |||
206 | 30934 | static void silk_lsp2poly(const int32_t lsp[/* 2 * half_order - 1 */], | |
207 | int32_t pol[/* half_order + 1 */], int half_order) | ||
208 | { | ||
209 | int i, j; | ||
210 | |||
211 | 30934 | pol[0] = 65536; // 1.0 in Q16 | |
212 | 30934 | pol[1] = -lsp[0]; | |
213 | |||
214 |
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214760 | for (i = 1; i < half_order; i++) { |
215 | 183826 | pol[i + 1] = pol[i - 1] * 2 - ROUND_MULL(lsp[2 * i], pol[i], 16); | |
216 |
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669880 | for (j = i; j > 1; j--) |
217 | 486054 | pol[j] += pol[j - 2] - ROUND_MULL(lsp[2 * i], pol[j - 1], 16); | |
218 | |||
219 | 183826 | pol[1] -= lsp[2 * i]; | |
220 | } | ||
221 | 30934 | } | |
222 | |||
223 | 15467 | static void silk_lsf2lpc(const int16_t nlsf[16], float lpcf[16], int order) | |
224 | { | ||
225 | int i, k; | ||
226 | int32_t lsp[16]; // Q17; 2*cos(LSF) | ||
227 | int32_t p[9], q[9]; // Q16 | ||
228 | int32_t lpc32[16]; // Q17 | ||
229 | int16_t lpc[16]; // Q12 | ||
230 | |||
231 | /* convert the LSFs to LSPs, i.e. 2*cos(LSF) */ | ||
232 |
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230227 | for (k = 0; k < order; k++) { |
233 | 214760 | int index = nlsf[k] >> 8; | |
234 | 214760 | int offset = nlsf[k] & 255; | |
235 |
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214760 | int k2 = (order == 10) ? ff_silk_lsf_ordering_nbmb[k] : ff_silk_lsf_ordering_wb[k]; |
236 | |||
237 | /* interpolate and round */ | ||
238 | 214760 | lsp[k2] = ff_silk_cosine[index] * 256; | |
239 | 214760 | lsp[k2] += (ff_silk_cosine[index + 1] - ff_silk_cosine[index]) * offset; | |
240 | 214760 | lsp[k2] = (lsp[k2] + 4) >> 3; | |
241 | } | ||
242 | |||
243 | 15467 | silk_lsp2poly(lsp , p, order >> 1); | |
244 | 15467 | silk_lsp2poly(lsp + 1, q, order >> 1); | |
245 | |||
246 | /* reconstruct A(z) */ | ||
247 |
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122847 | for (k = 0; k < order>>1; k++) { |
248 | 107380 | int32_t p_tmp = p[k + 1] + p[k]; | |
249 | 107380 | int32_t q_tmp = q[k + 1] - q[k]; | |
250 | 107380 | lpc32[k] = -q_tmp - p_tmp; | |
251 | 107380 | lpc32[order-k-1] = q_tmp - p_tmp; | |
252 | } | ||
253 | |||
254 | /* limit the range of the LPC coefficients to each fit within an int16_t */ | ||
255 |
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15467 | for (i = 0; i < 10; i++) { |
256 | int j; | ||
257 | 15467 | unsigned int maxabs = 0; | |
258 |
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230227 | for (j = 0, k = 0; j < order; j++) { |
259 | 214760 | unsigned int x = FFABS(lpc32[k]); | |
260 |
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214760 | if (x > maxabs) { |
261 | 15467 | maxabs = x; // Q17 | |
262 | 15467 | k = j; | |
263 | } | ||
264 | } | ||
265 | |||
266 | 15467 | maxabs = (maxabs + 16) >> 5; // convert to Q12 | |
267 | |||
268 |
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15467 | if (maxabs > 32767) { |
269 | /* perform bandwidth expansion */ | ||
270 | unsigned int chirp, chirp_base; // Q16 | ||
271 | ✗ | maxabs = FFMIN(maxabs, 163838); // anything above this overflows chirp's numerator | |
272 | ✗ | chirp_base = chirp = 65470 - ((maxabs - 32767) << 14) / ((maxabs * (k+1)) >> 2); | |
273 | |||
274 | ✗ | for (k = 0; k < order; k++) { | |
275 | ✗ | lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16); | |
276 | ✗ | chirp = (chirp_base * chirp + 32768) >> 16; | |
277 | } | ||
278 | 15467 | } else break; | |
279 | } | ||
280 | |||
281 |
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15467 | if (i == 10) { |
282 | /* time's up: just clamp */ | ||
283 | ✗ | for (k = 0; k < order; k++) { | |
284 | ✗ | int x = (lpc32[k] + 16) >> 5; | |
285 | ✗ | lpc[k] = av_clip_int16(x); | |
286 | ✗ | lpc32[k] = lpc[k] << 5; // shortcut mandated by the spec; drops lower 5 bits | |
287 | } | ||
288 | } else { | ||
289 |
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230227 | for (k = 0; k < order; k++) |
290 | 214760 | lpc[k] = (lpc32[k] + 16) >> 5; | |
291 | } | ||
292 | |||
293 | /* if the prediction gain causes the LPC filter to become unstable, | ||
294 | apply further bandwidth expansion on the Q17 coefficients */ | ||
295 |
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15676 | for (i = 1; i <= 16 && !silk_is_lpc_stable(lpc, order); i++) { |
296 | unsigned int chirp, chirp_base; | ||
297 | 209 | chirp_base = chirp = 65536 - (1 << i); | |
298 | |||
299 |
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3439 | for (k = 0; k < order; k++) { |
300 | 3230 | lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16); | |
301 | 3230 | lpc[k] = (lpc32[k] + 16) >> 5; | |
302 | 3230 | chirp = (chirp_base * chirp + 32768) >> 16; | |
303 | } | ||
304 | } | ||
305 | |||
306 |
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230227 | for (i = 0; i < order; i++) |
307 | 214760 | lpcf[i] = lpc[i] / 4096.0f; | |
308 | 15467 | } | |
309 | |||
310 | 13398 | static inline void silk_decode_lpc(SilkContext *s, SilkFrame *frame, | |
311 | OpusRangeCoder *rc, | ||
312 | float lpc_leadin[16], float lpc[16], | ||
313 | int *lpc_order, int *has_lpc_leadin, int voiced) | ||
314 | { | ||
315 | int i; | ||
316 | int order; // order of the LP polynomial; 10 for NB/MB and 16 for WB | ||
317 | int8_t lsf_i1, lsf_i2[16]; // stage-1 and stage-2 codebook indices | ||
318 | int16_t lsf_res[16]; // residual as a Q10 value | ||
319 | int16_t nlsf[16]; // Q15 | ||
320 | |||
321 |
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13398 | *lpc_order = order = s->wb ? 16 : 10; |
322 | |||
323 | /* obtain LSF stage-1 and stage-2 indices */ | ||
324 | 13398 | lsf_i1 = ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s1[s->wb][voiced]); | |
325 |
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200628 | for (i = 0; i < order; i++) { |
326 |
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187230 | int index = s->wb ? ff_silk_lsf_s2_model_sel_wb [lsf_i1][i] : |
327 | 45230 | ff_silk_lsf_s2_model_sel_nbmb[lsf_i1][i]; | |
328 | 187230 | lsf_i2[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s2[index]) - 4; | |
329 |
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187230 | if (lsf_i2[i] == -4) |
330 | 492 | lsf_i2[i] -= ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s2_ext); | |
331 |
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186738 | else if (lsf_i2[i] == 4) |
332 | 15 | lsf_i2[i] += ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_s2_ext); | |
333 | } | ||
334 | |||
335 | /* reverse the backwards-prediction step */ | ||
336 |
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200628 | for (i = order - 1; i >= 0; i--) { |
337 |
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187230 | int qstep = s->wb ? 9830 : 11796; |
338 | |||
339 | 187230 | lsf_res[i] = lsf_i2[i] * 1024; | |
340 |
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187230 | if (lsf_i2[i] < 0) lsf_res[i] += 102; |
341 |
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142211 | else if (lsf_i2[i] > 0) lsf_res[i] -= 102; |
342 | 187230 | lsf_res[i] = (lsf_res[i] * qstep) >> 16; | |
343 | |||
344 |
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187230 | if (i + 1 < order) { |
345 |
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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] : |
346 | 40707 | ff_silk_lsf_pred_weights_nbmb[ff_silk_lsf_weight_sel_nbmb[lsf_i1][i]][i]; | |
347 | 173832 | lsf_res[i] += (lsf_res[i+1] * weight) >> 8; | |
348 | } | ||
349 | } | ||
350 | |||
351 | /* reconstruct the NLSF coefficients from the supplied indices */ | ||
352 |
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200628 | for (i = 0; i < order; i++) { |
353 |
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187230 | const uint8_t * codebook = s->wb ? ff_silk_lsf_codebook_wb [lsf_i1] : |
354 | 45230 | ff_silk_lsf_codebook_nbmb[lsf_i1]; | |
355 | int cur, prev, next, weight_sq, weight, ipart, fpart, y, value; | ||
356 | |||
357 | /* find the weight of the residual */ | ||
358 | /* TODO: precompute */ | ||
359 | 187230 | cur = codebook[i]; | |
360 |
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187230 | prev = i ? codebook[i - 1] : 0; |
361 |
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187230 | next = i + 1 < order ? codebook[i + 1] : 256; |
362 | 187230 | weight_sq = (1024 / (cur - prev) + 1024 / (next - cur)) << 16; | |
363 | |||
364 | /* approximate square-root with mandated fixed-point arithmetic */ | ||
365 | 187230 | ipart = opus_ilog(weight_sq); | |
366 | 187230 | fpart = (weight_sq >> (ipart-8)) & 127; | |
367 |
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187230 | y = ((ipart & 1) ? 32768 : 46214) >> ((32 - ipart)>>1); |
368 | 187230 | weight = y + ((213 * fpart * y) >> 16); | |
369 | |||
370 | 187230 | value = cur * 128 + (lsf_res[i] * 16384) / weight; | |
371 | 187230 | nlsf[i] = av_clip_uintp2(value, 15); | |
372 | } | ||
373 | |||
374 | /* stabilize the NLSF coefficients */ | ||
375 |
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13398 | silk_stabilize_lsf(nlsf, order, s->wb ? ff_silk_lsf_min_spacing_wb : |
376 | ff_silk_lsf_min_spacing_nbmb); | ||
377 | |||
378 | /* produce an interpolation for the first 2 subframes, */ | ||
379 | /* and then convert both sets of NLSFs to LPC coefficients */ | ||
380 | 13398 | *has_lpc_leadin = 0; | |
381 |
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13398 | if (s->subframes == 4) { |
382 | 7717 | int offset = ff_opus_rc_dec_cdf(rc, ff_silk_model_lsf_interpolation_offset); | |
383 |
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7717 | if (offset != 4 && frame->coded) { |
384 | 2379 | *has_lpc_leadin = 1; | |
385 |
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2379 | if (offset != 0) { |
386 | int16_t nlsf_leadin[16]; | ||
387 |
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29599 | for (i = 0; i < order; i++) |
388 | 27530 | nlsf_leadin[i] = frame->nlsf[i] + | |
389 | 27530 | ((nlsf[i] - frame->nlsf[i]) * offset >> 2); | |
390 | 2069 | silk_lsf2lpc(nlsf_leadin, lpc_leadin, order); | |
391 | } else /* avoid re-computation for a (roughly) 1-in-4 occurrence */ | ||
392 | 310 | memcpy(lpc_leadin, frame->lpc, 16 * sizeof(float)); | |
393 | } else | ||
394 | 5338 | offset = 4; | |
395 | 7717 | s->nlsf_interp_factor = offset; | |
396 | |||
397 | 7717 | silk_lsf2lpc(nlsf, lpc, order); | |
398 | } else { | ||
399 | 5681 | s->nlsf_interp_factor = 4; | |
400 | 5681 | silk_lsf2lpc(nlsf, lpc, order); | |
401 | } | ||
402 | |||
403 | 13398 | memcpy(frame->nlsf, nlsf, order * sizeof(nlsf[0])); | |
404 | 13398 | memcpy(frame->lpc, lpc, order * sizeof(lpc[0])); | |
405 | 13398 | } | |
406 | |||
407 | 2344665 | static inline void silk_count_children(OpusRangeCoder *rc, int model, int32_t total, | |
408 | int32_t child[2]) | ||
409 | { | ||
410 |
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2344665 | if (total != 0) { |
411 | 2619176 | child[0] = ff_opus_rc_dec_cdf(rc, | |
412 | 1309588 | ff_silk_model_pulse_location[model] + (((total - 1 + 5) * (total - 1)) >> 1)); | |
413 | 1309588 | child[1] = total - child[0]; | |
414 | } else { | ||
415 | 1035077 | child[0] = 0; | |
416 | 1035077 | child[1] = 0; | |
417 | } | ||
418 | 2344665 | } | |
419 | |||
420 | 13398 | static inline void silk_decode_excitation(SilkContext *s, OpusRangeCoder *rc, | |
421 | float* excitationf, | ||
422 | int qoffset_high, int active, int voiced) | ||
423 | { | ||
424 | int i; | ||
425 | uint32_t seed; | ||
426 | int shellblocks; | ||
427 | int ratelevel; | ||
428 | uint8_t pulsecount[20]; // total pulses in each shell block | ||
429 | 13398 | uint8_t lsbcount[20] = {0}; // raw lsbits defined for each pulse in each shell block | |
430 | int32_t excitation[320]; // Q23 | ||
431 | |||
432 | /* excitation parameters */ | ||
433 | 13398 | seed = ff_opus_rc_dec_cdf(rc, ff_silk_model_lcg_seed); | |
434 | 13398 | shellblocks = ff_silk_shell_blocks[s->bandwidth][s->subframes >> 2]; | |
435 | 13398 | ratelevel = ff_opus_rc_dec_cdf(rc, ff_silk_model_exc_rate[voiced]); | |
436 | |||
437 |
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194855 | for (i = 0; i < shellblocks; i++) { |
438 | 181457 | pulsecount[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_pulse_count[ratelevel]); | |
439 |
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181457 | if (pulsecount[i] == 17) { |
440 |
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23620 | while (pulsecount[i] == 17 && ++lsbcount[i] != 10) |
441 | 13252 | pulsecount[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_pulse_count[9]); | |
442 |
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10368 | if (lsbcount[i] == 10) |
443 | ✗ | pulsecount[i] = ff_opus_rc_dec_cdf(rc, ff_silk_model_pulse_count[10]); | |
444 | } | ||
445 | } | ||
446 | |||
447 | /* decode pulse locations using PVQ */ | ||
448 |
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194855 | for (i = 0; i < shellblocks; i++) { |
449 |
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181457 | if (pulsecount[i] != 0) { |
450 | int a, b, c, d; | ||
451 | 156311 | int32_t * location = excitation + 16*i; | |
452 | int32_t branch[4][2]; | ||
453 | 156311 | branch[0][0] = pulsecount[i]; | |
454 | |||
455 | /* unrolled tail recursion */ | ||
456 |
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312622 | for (a = 0; a < 1; a++) { |
457 | 156311 | silk_count_children(rc, 0, branch[0][a], branch[1]); | |
458 |
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468933 | for (b = 0; b < 2; b++) { |
459 | 312622 | silk_count_children(rc, 1, branch[1][b], branch[2]); | |
460 |
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937866 | for (c = 0; c < 2; c++) { |
461 | 625244 | silk_count_children(rc, 2, branch[2][c], branch[3]); | |
462 |
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1875732 | for (d = 0; d < 2; d++) { |
463 | 1250488 | silk_count_children(rc, 3, branch[3][d], location); | |
464 | 1250488 | location += 2; | |
465 | } | ||
466 | } | ||
467 | } | ||
468 | } | ||
469 | } else | ||
470 | 25146 | memset(excitation + 16*i, 0, 16*sizeof(int32_t)); | |
471 | } | ||
472 | |||
473 | /* decode least significant bits */ | ||
474 |
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2916710 | for (i = 0; i < shellblocks << 4; i++) { |
475 | int bit; | ||
476 |
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3115344 | for (bit = 0; bit < lsbcount[i >> 4]; bit++) |
477 | 212032 | excitation[i] = (excitation[i] << 1) | | |
478 | 212032 | ff_opus_rc_dec_cdf(rc, ff_silk_model_excitation_lsb); | |
479 | } | ||
480 | |||
481 | /* decode signs */ | ||
482 |
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2916710 | for (i = 0; i < shellblocks << 4; i++) { |
483 |
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2903312 | if (excitation[i] != 0) { |
484 | 1344130 | int sign = ff_opus_rc_dec_cdf(rc, ff_silk_model_excitation_sign[active + | |
485 | 672065 | voiced][qoffset_high][FFMIN(pulsecount[i >> 4], 6)]); | |
486 |
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672065 | if (sign == 0) |
487 | 446576 | excitation[i] *= -1; | |
488 | } | ||
489 | } | ||
490 | |||
491 | /* assemble the excitation */ | ||
492 |
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2916710 | for (i = 0; i < shellblocks << 4; i++) { |
493 | 2903312 | int value = excitation[i]; | |
494 | 2903312 | excitation[i] = value * 256 | ff_silk_quant_offset[voiced][qoffset_high]; | |
495 |
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2903312 | if (value < 0) excitation[i] += 20; |
496 |
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2456736 | else if (value > 0) excitation[i] -= 20; |
497 | |||
498 | /* invert samples pseudorandomly */ | ||
499 | 2903312 | seed = 196314165 * seed + 907633515; | |
500 |
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2903312 | if (seed & 0x80000000) |
501 | 1436833 | excitation[i] *= -1; | |
502 | 2903312 | seed += value; | |
503 | |||
504 | 2903312 | excitationf[i] = excitation[i] / 8388608.0f; | |
505 | } | ||
506 | 13398 | } | |
507 | |||
508 | /** Maximum residual history according to 4.2.7.6.1 */ | ||
509 | #define SILK_MAX_LAG (288 + LTP_ORDER / 2) | ||
510 | |||
511 | /** Order of the LTP filter */ | ||
512 | #define LTP_ORDER 5 | ||
513 | |||
514 | 13398 | static void silk_decode_frame(SilkContext *s, OpusRangeCoder *rc, | |
515 | int frame_num, int channel, int coded_channels, | ||
516 | int active, int active1, int redundant) | ||
517 | { | ||
518 | /* per frame */ | ||
519 | int voiced; // combines with active to indicate inactive, active, or active+voiced | ||
520 | int qoffset_high; | ||
521 | int order; // order of the LPC coefficients | ||
522 | float lpc_leadin[16], lpc_body[16], residual[SILK_MAX_LAG + SILK_HISTORY]; | ||
523 | int has_lpc_leadin; | ||
524 | float ltpscale; | ||
525 | |||
526 | /* per subframe */ | ||
527 | struct { | ||
528 | float gain; | ||
529 | int pitchlag; | ||
530 | float ltptaps[5]; | ||
531 | } sf[4]; | ||
532 | |||
533 | 13398 | SilkFrame * const frame = s->frame + channel; | |
534 | |||
535 | int i; | ||
536 | |||
537 | /* obtain stereo weights */ | ||
538 |
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13398 | if (coded_channels == 2 && channel == 0) { |
539 | int n, wi[2], ws[2], w[2]; | ||
540 | 4678 | n = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s1); | |
541 | 4678 | wi[0] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s2) + 3 * (n / 5); | |
542 | 4678 | ws[0] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s3); | |
543 | 4678 | wi[1] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s2) + 3 * (n % 5); | |
544 | 4678 | ws[1] = ff_opus_rc_dec_cdf(rc, ff_silk_model_stereo_s3); | |
545 | |||
546 |
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14034 | for (i = 0; i < 2; i++) |
547 | 9356 | w[i] = ff_silk_stereo_weights[wi[i]] + | |
548 | 9356 | (((ff_silk_stereo_weights[wi[i] + 1] - ff_silk_stereo_weights[wi[i]]) * 6554) >> 16) | |
549 | 9356 | * (ws[i]*2 + 1); | |
550 | |||
551 | 4678 | s->stereo_weights[0] = (w[0] - w[1]) / 8192.0; | |
552 | 4678 | s->stereo_weights[1] = w[1] / 8192.0; | |
553 | |||
554 | /* and read the mid-only flag */ | ||
555 |
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4678 | s->midonly = active1 ? 0 : ff_opus_rc_dec_cdf(rc, ff_silk_model_mid_only); |
556 | } | ||
557 | |||
558 | /* obtain frame type */ | ||
559 |
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13398 | if (!active) { |
560 | 3469 | qoffset_high = ff_opus_rc_dec_cdf(rc, ff_silk_model_frame_type_inactive); | |
561 | 3469 | voiced = 0; | |
562 | } else { | ||
563 | 9929 | int type = ff_opus_rc_dec_cdf(rc, ff_silk_model_frame_type_active); | |
564 | 9929 | qoffset_high = type & 1; | |
565 | 9929 | voiced = type >> 1; | |
566 | } | ||
567 | |||
568 | /* obtain subframe quantization gains */ | ||
569 |
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55628 | for (i = 0; i < s->subframes; i++) { |
570 | int log_gain; //Q7 | ||
571 | int ipart, fpart, lingain; | ||
572 | |||
573 |
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54008 | if (i == 0 && (frame_num == 0 || !frame->coded)) { |
574 | /* gain is coded absolute */ | ||
575 | 11778 | int x = ff_opus_rc_dec_cdf(rc, ff_silk_model_gain_highbits[active + voiced]); | |
576 | 11778 | log_gain = (x<<3) | ff_opus_rc_dec_cdf(rc, ff_silk_model_gain_lowbits); | |
577 | |||
578 |
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11778 | if (frame->coded) |
579 |
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11724 | log_gain = FFMAX(log_gain, frame->log_gain - 16); |
580 | } else { | ||
581 | /* gain is coded relative */ | ||
582 | 30452 | int delta_gain = ff_opus_rc_dec_cdf(rc, ff_silk_model_gain_delta); | |
583 |
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30452 | log_gain = av_clip_uintp2(FFMAX((delta_gain<<1) - 16, |
584 | frame->log_gain + delta_gain - 4), 6); | ||
585 | } | ||
586 | |||
587 | 42230 | frame->log_gain = log_gain; | |
588 | |||
589 | /* approximate 2**(x/128) with a Q7 (i.e. non-integer) input */ | ||
590 | 42230 | log_gain = (log_gain * 0x1D1C71 >> 16) + 2090; | |
591 | 42230 | ipart = log_gain >> 7; | |
592 | 42230 | fpart = log_gain & 127; | |
593 | 42230 | lingain = (1 << ipart) + ((-174 * fpart * (128-fpart) >>16) + fpart) * ((1<<ipart) >> 7); | |
594 | 42230 | sf[i].gain = lingain / 65536.0f; | |
595 | } | ||
596 | |||
597 | /* obtain LPC filter coefficients */ | ||
598 | 13398 | silk_decode_lpc(s, frame, rc, lpc_leadin, lpc_body, &order, &has_lpc_leadin, voiced); | |
599 | |||
600 | /* obtain pitch lags, if this is a voiced frame */ | ||
601 |
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13398 | if (voiced) { |
602 |
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4652 | int lag_absolute = (!frame_num || !frame->prev_voiced); |
603 | int primarylag; // primary pitch lag for the entire SILK frame | ||
604 | int ltpfilter; | ||
605 | const int8_t * offsets; | ||
606 | |||
607 |
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4652 | if (!lag_absolute) { |
608 | 609 | int delta = ff_opus_rc_dec_cdf(rc, ff_silk_model_pitch_delta); | |
609 |
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609 | if (delta) |
610 | 538 | primarylag = frame->primarylag + delta - 9; | |
611 | else | ||
612 | 71 | lag_absolute = 1; | |
613 | } | ||
614 | |||
615 |
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4652 | if (lag_absolute) { |
616 | /* primary lag is coded absolute */ | ||
617 | int highbits, lowbits; | ||
618 | static const uint16_t * const model[] = { | ||
619 | ff_silk_model_pitch_lowbits_nb, ff_silk_model_pitch_lowbits_mb, | ||
620 | ff_silk_model_pitch_lowbits_wb | ||
621 | }; | ||
622 | 4114 | highbits = ff_opus_rc_dec_cdf(rc, ff_silk_model_pitch_highbits); | |
623 | 4114 | lowbits = ff_opus_rc_dec_cdf(rc, model[s->bandwidth]); | |
624 | |||
625 | 4114 | primarylag = ff_silk_pitch_min_lag[s->bandwidth] + | |
626 | 4114 | highbits*ff_silk_pitch_scale[s->bandwidth] + lowbits; | |
627 | } | ||
628 | 4652 | frame->primarylag = primarylag; | |
629 | |||
630 |
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4652 | if (s->subframes == 2) |
631 | 1524 | offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND) | |
632 | 239 | ? ff_silk_pitch_offset_nb10ms[ff_opus_rc_dec_cdf(rc, | |
633 | ff_silk_model_pitch_contour_nb10ms)] | ||
634 |
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1763 | : ff_silk_pitch_offset_mbwb10ms[ff_opus_rc_dec_cdf(rc, |
635 | ff_silk_model_pitch_contour_mbwb10ms)]; | ||
636 | else | ||
637 | 3128 | offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND) | |
638 | 807 | ? ff_silk_pitch_offset_nb20ms[ff_opus_rc_dec_cdf(rc, | |
639 | ff_silk_model_pitch_contour_nb20ms)] | ||
640 |
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3935 | : ff_silk_pitch_offset_mbwb20ms[ff_opus_rc_dec_cdf(rc, |
641 | ff_silk_model_pitch_contour_mbwb20ms)]; | ||
642 | |||
643 |
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20212 | for (i = 0; i < s->subframes; i++) |
644 | 15560 | sf[i].pitchlag = av_clip(primarylag + offsets[i], | |
645 | 15560 | ff_silk_pitch_min_lag[s->bandwidth], | |
646 | 15560 | ff_silk_pitch_max_lag[s->bandwidth]); | |
647 | |||
648 | /* obtain LTP filter coefficients */ | ||
649 | 4652 | ltpfilter = ff_opus_rc_dec_cdf(rc, ff_silk_model_ltp_filter); | |
650 |
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20212 | for (i = 0; i < s->subframes; i++) { |
651 | int index, j; | ||
652 | static const uint16_t * const filter_sel[] = { | ||
653 | ff_silk_model_ltp_filter0_sel, ff_silk_model_ltp_filter1_sel, | ||
654 | ff_silk_model_ltp_filter2_sel | ||
655 | }; | ||
656 | static const int8_t (* const filter_taps[])[5] = { | ||
657 | ff_silk_ltp_filter0_taps, ff_silk_ltp_filter1_taps, ff_silk_ltp_filter2_taps | ||
658 | }; | ||
659 | 15560 | index = ff_opus_rc_dec_cdf(rc, filter_sel[ltpfilter]); | |
660 |
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93360 | for (j = 0; j < 5; j++) |
661 | 77800 | sf[i].ltptaps[j] = filter_taps[ltpfilter][index][j] / 128.0f; | |
662 | } | ||
663 | } | ||
664 | |||
665 | /* obtain LTP scale factor */ | ||
666 |
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13398 | if (voiced && frame_num == 0) |
667 | 3956 | ltpscale = ff_silk_ltp_scale_factor[ff_opus_rc_dec_cdf(rc, | |
668 | 3956 | ff_silk_model_ltp_scale_index)] / 16384.0f; | |
669 | 9442 | else ltpscale = 15565.0f/16384.0f; | |
670 | |||
671 | /* generate the excitation signal for the entire frame */ | ||
672 | 13398 | silk_decode_excitation(s, rc, residual + SILK_MAX_LAG, qoffset_high, | |
673 | active, voiced); | ||
674 | |||
675 | /* skip synthesising the output if we do not need it */ | ||
676 | // TODO: implement error recovery | ||
677 |
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13398 | if (s->output_channels == channel || redundant) |
678 | 33 | return; | |
679 | |||
680 | /* generate the output signal */ | ||
681 |
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55463 | for (i = 0; i < s->subframes; i++) { |
682 |
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42098 | const float * lpc_coeff = (i < 2 && has_lpc_leadin) ? lpc_leadin : lpc_body; |
683 | 42098 | float *dst = frame->output + SILK_HISTORY + i * s->sflength; | |
684 | 42098 | float *resptr = residual + SILK_MAX_LAG + i * s->sflength; | |
685 | 42098 | float *lpc = frame->lpc_history + SILK_HISTORY + i * s->sflength; | |
686 | float sum; | ||
687 | int j, k; | ||
688 | |||
689 |
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42098 | if (voiced) { |
690 | int out_end; | ||
691 | float scale; | ||
692 | |||
693 |
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15500 | if (i < 2 || s->nlsf_interp_factor == 4) { |
694 | 13602 | out_end = -i * s->sflength; | |
695 | 13602 | scale = ltpscale; | |
696 | } else { | ||
697 | 1898 | out_end = -(i - 2) * s->sflength; | |
698 | 1898 | scale = 1.0f; | |
699 | } | ||
700 | |||
701 | /* when the LPC coefficients change, a re-whitening filter is used */ | ||
702 | /* to produce a residual that accounts for the change */ | ||
703 |
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672160 | for (j = - sf[i].pitchlag - LTP_ORDER/2; j < out_end; j++) { |
704 | 656660 | sum = dst[j]; | |
705 |
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9968278 | for (k = 0; k < order; k++) |
706 | 9311618 | sum -= lpc_coeff[k] * dst[j - k - 1]; | |
707 | 656660 | resptr[j] = av_clipf(sum, -1.0f, 1.0f) * scale / sf[i].gain; | |
708 | } | ||
709 | |||
710 |
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15500 | if (out_end) { |
711 | 9914 | float rescale = sf[i-1].gain / sf[i].gain; | |
712 |
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1099614 | for (j = out_end; j < 0; j++) |
713 | 1089700 | resptr[j] *= rescale; | |
714 | } | ||
715 | |||
716 | /* LTP synthesis */ | ||
717 |
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1049300 | for (j = 0; j < s->sflength; j++) { |
718 | 1033800 | sum = resptr[j]; | |
719 |
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6202800 | for (k = 0; k < LTP_ORDER; k++) |
720 | 5169000 | sum += sf[i].ltptaps[k] * resptr[j - sf[i].pitchlag + LTP_ORDER/2 - k]; | |
721 | 1033800 | resptr[j] = sum; | |
722 | } | ||
723 | } | ||
724 | |||
725 | /* LPC synthesis */ | ||
726 |
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2929858 | for (j = 0; j < s->sflength; j++) { |
727 | 2887760 | sum = resptr[j] * sf[i].gain; | |
728 |
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44536240 | for (k = 1; k <= order; k++) |
729 | 41648480 | sum += lpc_coeff[k - 1] * lpc[j - k]; | |
730 | |||
731 | 2887760 | lpc[j] = sum; | |
732 | 2887760 | dst[j] = av_clipf(sum, -1.0f, 1.0f); | |
733 | } | ||
734 | } | ||
735 | |||
736 | 13365 | frame->prev_voiced = voiced; | |
737 | 13365 | memmove(frame->lpc_history, frame->lpc_history + s->flength, SILK_HISTORY * sizeof(float)); | |
738 | 13365 | memmove(frame->output, frame->output + s->flength, SILK_HISTORY * sizeof(float)); | |
739 | |||
740 | 13365 | frame->coded = 1; | |
741 | } | ||
742 | |||
743 | 4645 | static void silk_unmix_ms(SilkContext *s, float *l, float *r) | |
744 | { | ||
745 | 4645 | float *mid = s->frame[0].output + SILK_HISTORY - s->flength; | |
746 | 4645 | float *side = s->frame[1].output + SILK_HISTORY - s->flength; | |
747 | 4645 | float w0_prev = s->prev_stereo_weights[0]; | |
748 | 4645 | float w1_prev = s->prev_stereo_weights[1]; | |
749 | 4645 | float w0 = s->stereo_weights[0]; | |
750 | 4645 | float w1 = s->stereo_weights[1]; | |
751 | 4645 | int n1 = ff_silk_stereo_interp_len[s->bandwidth]; | |
752 | int i; | ||
753 | |||
754 |
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528645 | for (i = 0; i < n1; i++) { |
755 | 524000 | float interp0 = w0_prev + i * (w0 - w0_prev) / n1; | |
756 | 524000 | float interp1 = w1_prev + i * (w1 - w1_prev) / n1; | |
757 | 524000 | float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]); | |
758 | |||
759 | 524000 | l[i] = av_clipf((1 + interp1) * mid[i - 1] + side[i - 1] + interp0 * p0, -1.0, 1.0); | |
760 | 524000 | r[i] = av_clipf((1 - interp1) * mid[i - 1] - side[i - 1] - interp0 * p0, -1.0, 1.0); | |
761 | } | ||
762 | |||
763 |
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437485 | for (; i < s->flength; i++) { |
764 | 432840 | float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]); | |
765 | |||
766 | 432840 | l[i] = av_clipf((1 + w1) * mid[i - 1] + side[i - 1] + w0 * p0, -1.0, 1.0); | |
767 | 432840 | r[i] = av_clipf((1 - w1) * mid[i - 1] - side[i - 1] - w0 * p0, -1.0, 1.0); | |
768 | } | ||
769 | |||
770 | 4645 | memcpy(s->prev_stereo_weights, s->stereo_weights, sizeof(s->stereo_weights)); | |
771 | 4645 | } | |
772 | |||
773 | 50022 | static void silk_flush_frame(SilkFrame *frame) | |
774 | { | ||
775 |
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50022 | if (!frame->coded) |
776 | 49989 | return; | |
777 | |||
778 | 33 | memset(frame->output, 0, sizeof(frame->output)); | |
779 | 33 | memset(frame->lpc_history, 0, sizeof(frame->lpc_history)); | |
780 | |||
781 | 33 | memset(frame->lpc, 0, sizeof(frame->lpc)); | |
782 | 33 | memset(frame->nlsf, 0, sizeof(frame->nlsf)); | |
783 | |||
784 | 33 | frame->log_gain = 0; | |
785 | |||
786 | 33 | frame->primarylag = 0; | |
787 | 33 | frame->prev_voiced = 0; | |
788 | 33 | frame->coded = 0; | |
789 | } | ||
790 | |||
791 | 9523 | int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc, | |
792 | float *output[2], | ||
793 | enum OpusBandwidth bandwidth, | ||
794 | int coded_channels, | ||
795 | int duration_ms) | ||
796 | { | ||
797 | int active[2][6], redundancy[2]; | ||
798 | int nb_frames, i, j; | ||
799 | |||
800 |
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9523 | if (bandwidth > OPUS_BANDWIDTH_WIDEBAND || |
801 |
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9523 | coded_channels > 2 || duration_ms > 60) { |
802 | ✗ | av_log(s->avctx, AV_LOG_ERROR, "Invalid parameters passed " | |
803 | "to the SILK decoder.\n"); | ||
804 | ✗ | return AVERROR(EINVAL); | |
805 | } | ||
806 | |||
807 |
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9523 | nb_frames = 1 + (duration_ms > 20) + (duration_ms > 40); |
808 | 9523 | s->subframes = duration_ms / nb_frames / 5; // 5ms subframes | |
809 | 9523 | s->sflength = 20 * (bandwidth + 2); | |
810 | 9523 | s->flength = s->sflength * s->subframes; | |
811 | 9523 | s->bandwidth = bandwidth; | |
812 | 9523 | s->wb = bandwidth == OPUS_BANDWIDTH_WIDEBAND; | |
813 | |||
814 | /* make sure to flush the side channel when switching from mono to stereo */ | ||
815 |
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9523 | if (coded_channels > s->prev_coded_channels) |
816 | 37 | silk_flush_frame(&s->frame[1]); | |
817 | 9523 | s->prev_coded_channels = coded_channels; | |
818 | |||
819 | /* read the LP-layer header bits */ | ||
820 |
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23153 | for (i = 0; i < coded_channels; i++) { |
821 |
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28880 | for (j = 0; j < nb_frames; j++) |
822 | 15250 | active[i][j] = ff_opus_rc_dec_log(rc, 1); | |
823 | |||
824 | 13630 | redundancy[i] = ff_opus_rc_dec_log(rc, 1); | |
825 | } | ||
826 | |||
827 | /* read the per-frame LBRR flags */ | ||
828 |
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23153 | for (i = 0; i < coded_channels; i++) |
829 |
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13630 | if (redundancy[i] && duration_ms > 20) { |
830 | ✗ | redundancy[i] = ff_opus_rc_dec_cdf(rc, duration_ms == 40 ? | |
831 | ff_silk_model_lbrr_flags_40 : ff_silk_model_lbrr_flags_60); | ||
832 | } | ||
833 | |||
834 | /* decode the LBRR frames */ | ||
835 |
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20128 | for (i = 0; i < nb_frames; i++) { |
836 |
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25855 | for (j = 0; j < coded_channels; j++) |
837 |
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15250 | if (redundancy[j] & (1 << i)) { |
838 |
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33 | int active1 = (j == 0 && !(redundancy[1] & (1 << i))) ? 0 : 1; |
839 | 33 | silk_decode_frame(s, rc, i, j, coded_channels, 1, active1, 1); | |
840 | } | ||
841 | |||
842 | 10605 | s->midonly = 0; | |
843 | } | ||
844 | |||
845 |
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20128 | for (i = 0; i < nb_frames; i++) { |
846 |
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23970 | for (j = 0; j < coded_channels && !s->midonly; j++) |
847 | 13365 | silk_decode_frame(s, rc, i, j, coded_channels, active[j][i], active[1][i], 0); | |
848 | |||
849 | /* reset the side channel if it is not coded */ | ||
850 |
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10605 | if (s->midonly && s->frame[1].coded) |
851 | 13 | silk_flush_frame(&s->frame[1]); | |
852 | |||
853 |
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10605 | if (coded_channels == 1 || s->output_channels == 1) { |
854 |
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17878 | for (j = 0; j < s->output_channels; j++) { |
855 | 11918 | memcpy(output[j] + i * s->flength, | |
856 | 11918 | s->frame[0].output + SILK_HISTORY - s->flength - 2, | |
857 | 11918 | s->flength * sizeof(float)); | |
858 | } | ||
859 | } else { | ||
860 | 4645 | silk_unmix_ms(s, output[0] + i * s->flength, output[1] + i * s->flength); | |
861 | } | ||
862 | |||
863 | 10605 | s->midonly = 0; | |
864 | } | ||
865 | |||
866 | 9523 | return nb_frames * s->flength; | |
867 | } | ||
868 | |||
869 | 58 | void ff_silk_free(SilkContext **ps) | |
870 | { | ||
871 | 58 | av_freep(ps); | |
872 | 58 | } | |
873 | |||
874 | 24986 | void ff_silk_flush(SilkContext *s) | |
875 | { | ||
876 | 24986 | silk_flush_frame(&s->frame[0]); | |
877 | 24986 | silk_flush_frame(&s->frame[1]); | |
878 | |||
879 | 24986 | memset(s->prev_stereo_weights, 0, sizeof(s->prev_stereo_weights)); | |
880 | 24986 | } | |
881 | |||
882 | 58 | int ff_silk_init(AVCodecContext *avctx, SilkContext **ps, int output_channels) | |
883 | { | ||
884 | SilkContext *s; | ||
885 | |||
886 |
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58 | if (output_channels != 1 && output_channels != 2) { |
887 | ✗ | av_log(avctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n", | |
888 | output_channels); | ||
889 | ✗ | return AVERROR(EINVAL); | |
890 | } | ||
891 | |||
892 | 58 | s = av_mallocz(sizeof(*s)); | |
893 |
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58 | if (!s) |
894 | ✗ | return AVERROR(ENOMEM); | |
895 | |||
896 | 58 | s->avctx = avctx; | |
897 | 58 | s->output_channels = output_channels; | |
898 | |||
899 | 58 | ff_silk_flush(s); | |
900 | |||
901 | 58 | *ps = s; | |
902 | |||
903 | 58 | return 0; | |
904 | } | ||
905 |