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1 | /* | ||
2 | * Copyright (c) 2012 Andrew D'Addesio | ||
3 | * Copyright (c) 2013-2014 Mozilla Corporation | ||
4 | * Copyright (c) 2016 Rostislav Pehlivanov <atomnuker@gmail.com> | ||
5 | * | ||
6 | * This file is part of FFmpeg. | ||
7 | * | ||
8 | * FFmpeg is free software; you can redistribute it and/or | ||
9 | * modify it under the terms of the GNU Lesser General Public | ||
10 | * License as published by the Free Software Foundation; either | ||
11 | * version 2.1 of the License, or (at your option) any later version. | ||
12 | * | ||
13 | * FFmpeg is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
16 | * Lesser General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU Lesser General Public | ||
19 | * License along with FFmpeg; if not, write to the Free Software | ||
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
21 | */ | ||
22 | |||
23 | /** | ||
24 | * @file | ||
25 | * Opus CELT decoder | ||
26 | */ | ||
27 | |||
28 | #include <float.h> | ||
29 | |||
30 | #include "opus_celt.h" | ||
31 | #include "opustab.h" | ||
32 | #include "opus_pvq.h" | ||
33 | |||
34 | /* Use the 2D z-transform to apply prediction in both the time domain (alpha) | ||
35 | * and the frequency domain (beta) */ | ||
36 | 29947 | static void celt_decode_coarse_energy(CeltFrame *f, OpusRangeCoder *rc) | |
37 | { | ||
38 | int i, j; | ||
39 | 29947 | float prev[2] = { 0 }; | |
40 | 29947 | float alpha = ff_celt_alpha_coef[f->size]; | |
41 | 29947 | float beta = ff_celt_beta_coef[f->size]; | |
42 | 29947 | const uint8_t *model = ff_celt_coarse_energy_dist[f->size][0]; | |
43 | |||
44 | /* intra frame */ | ||
45 |
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29947 | if (opus_rc_tell(rc) + 3 <= f->framebits && ff_opus_rc_dec_log(rc, 3)) { |
46 | 5882 | alpha = 0.0f; | |
47 | 5882 | beta = 1.0f - (4915.0f/32768.0f); | |
48 | 5882 | model = ff_celt_coarse_energy_dist[f->size][1]; | |
49 | } | ||
50 | |||
51 |
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658834 | for (i = 0; i < CELT_MAX_BANDS; i++) { |
52 |
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1652532 | for (j = 0; j < f->channels; j++) { |
53 | 1023645 | CeltBlock *block = &f->block[j]; | |
54 | float value; | ||
55 | int available; | ||
56 | |||
57 |
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1023645 | if (i < f->start_band || i >= f->end_band) { |
58 | 172932 | block->energy[i] = 0.0; | |
59 | 172932 | continue; | |
60 | } | ||
61 | |||
62 | 850713 | available = f->framebits - opus_rc_tell(rc); | |
63 |
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850713 | if (available >= 15) { |
64 | /* decode using a Laplace distribution */ | ||
65 | 846877 | int k = FFMIN(i, 20) << 1; | |
66 | 846877 | value = ff_opus_rc_dec_laplace(rc, model[k] << 7, model[k+1] << 6); | |
67 |
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3836 | } else if (available >= 2) { |
68 | 113 | int x = ff_opus_rc_dec_cdf(rc, ff_celt_model_energy_small); | |
69 | 113 | value = (x>>1) ^ -(x&1); | |
70 |
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3723 | } else if (available >= 1) { |
71 | 3 | value = -(float)ff_opus_rc_dec_log(rc, 1); | |
72 | 3720 | } else value = -1; | |
73 | |||
74 |
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850713 | block->energy[i] = FFMAX(-9.0f, block->energy[i]) * alpha + prev[j] + value; |
75 | 850713 | prev[j] += beta * value; | |
76 | } | ||
77 | } | ||
78 | 29947 | } | |
79 | |||
80 | 29947 | static void celt_decode_fine_energy(CeltFrame *f, OpusRangeCoder *rc) | |
81 | { | ||
82 | int i; | ||
83 |
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538581 | for (i = f->start_band; i < f->end_band; i++) { |
84 | int j; | ||
85 |
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508634 | if (!f->fine_bits[i]) |
86 | 95389 | continue; | |
87 | |||
88 |
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1095462 | for (j = 0; j < f->channels; j++) { |
89 | 682217 | CeltBlock *block = &f->block[j]; | |
90 | int q2; | ||
91 | float offset; | ||
92 | 682217 | q2 = ff_opus_rc_get_raw(rc, f->fine_bits[i]); | |
93 | 682217 | offset = (q2 + 0.5f) * (1 << (14 - f->fine_bits[i])) / 16384.0f - 0.5f; | |
94 | 682217 | block->energy[i] += offset; | |
95 | } | ||
96 | } | ||
97 | 29947 | } | |
98 | |||
99 | 29947 | static void celt_decode_final_energy(CeltFrame *f, OpusRangeCoder *rc) | |
100 | { | ||
101 | int priority, i, j; | ||
102 | 29947 | int bits_left = f->framebits - opus_rc_tell(rc); | |
103 | |||
104 |
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89841 | for (priority = 0; priority < 2; priority++) { |
105 |
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162803 | for (i = f->start_band; i < f->end_band && bits_left >= f->channels; i++) { |
106 |
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102909 | if (f->fine_priority[i] != priority || f->fine_bits[i] >= CELT_MAX_FINE_BITS) |
107 | 65479 | continue; | |
108 | |||
109 |
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96406 | for (j = 0; j < f->channels; j++) { |
110 | int q2; | ||
111 | float offset; | ||
112 | 58976 | q2 = ff_opus_rc_get_raw(rc, 1); | |
113 | 58976 | offset = (q2 - 0.5f) * (1 << (14 - f->fine_bits[i] - 1)) / 16384.0f; | |
114 | 58976 | f->block[j].energy[i] += offset; | |
115 | 58976 | bits_left--; | |
116 | } | ||
117 | } | ||
118 | } | ||
119 | 29947 | } | |
120 | |||
121 | 29947 | static void celt_decode_tf_changes(CeltFrame *f, OpusRangeCoder *rc) | |
122 | { | ||
123 | 29947 | int i, diff = 0, tf_select = 0, tf_changed = 0, tf_select_bit; | |
124 |
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29947 | int consumed, bits = f->transient ? 2 : 4; |
125 | |||
126 | 29947 | consumed = opus_rc_tell(rc); | |
127 |
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29947 | tf_select_bit = (f->size != 0 && consumed+bits+1 <= f->framebits); |
128 | |||
129 |
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538581 | for (i = f->start_band; i < f->end_band; i++) { |
130 |
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508634 | if (consumed+bits+tf_select_bit <= f->framebits) { |
131 | 506137 | diff ^= ff_opus_rc_dec_log(rc, bits); | |
132 | 506137 | consumed = opus_rc_tell(rc); | |
133 | 506137 | tf_changed |= diff; | |
134 | } | ||
135 | 508634 | f->tf_change[i] = diff; | |
136 |
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508634 | bits = f->transient ? 4 : 5; |
137 | } | ||
138 | |||
139 |
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29947 | if (tf_select_bit && ff_celt_tf_select[f->size][f->transient][0][tf_changed] != |
140 |
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16144 | ff_celt_tf_select[f->size][f->transient][1][tf_changed]) |
141 | 8124 | tf_select = ff_opus_rc_dec_log(rc, 1); | |
142 | |||
143 |
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538581 | for (i = f->start_band; i < f->end_band; i++) { |
144 | 508634 | f->tf_change[i] = ff_celt_tf_select[f->size][f->transient][tf_select][f->tf_change[i]]; | |
145 | } | ||
146 | 29947 | } | |
147 | |||
148 | 48745 | static void celt_denormalize(CeltFrame *f, CeltBlock *block, float *data) | |
149 | { | ||
150 | int i, j; | ||
151 | |||
152 |
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899458 | for (i = f->start_band; i < f->end_band; i++) { |
153 | 850713 | float *dst = data + (ff_celt_freq_bands[i] << f->size); | |
154 | 850713 | float log_norm = block->energy[i] + ff_celt_mean_energy[i]; | |
155 |
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850713 | float norm = exp2f(FFMIN(log_norm, 32.0f)); |
156 | |||
157 |
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13199773 | for (j = 0; j < ff_celt_freq_range[i] << f->size; j++) |
158 | 12349060 | dst[j] *= norm; | |
159 | } | ||
160 | 48745 | } | |
161 | |||
162 | 89302 | static void celt_postfilter_apply_transition(CeltBlock *block, float *data) | |
163 | { | ||
164 | 89302 | const int T0 = block->pf_period_old; | |
165 | 89302 | const int T1 = block->pf_period; | |
166 | |||
167 | float g00, g01, g02; | ||
168 | float g10, g11, g12; | ||
169 | |||
170 | float x0, x1, x2, x3, x4; | ||
171 | |||
172 | int i; | ||
173 | |||
174 |
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89302 | if (block->pf_gains[0] == 0.0 && |
175 |
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41858 | block->pf_gains_old[0] == 0.0) |
176 | 37678 | return; | |
177 | |||
178 | 51624 | g00 = block->pf_gains_old[0]; | |
179 | 51624 | g01 = block->pf_gains_old[1]; | |
180 | 51624 | g02 = block->pf_gains_old[2]; | |
181 | 51624 | g10 = block->pf_gains[0]; | |
182 | 51624 | g11 = block->pf_gains[1]; | |
183 | 51624 | g12 = block->pf_gains[2]; | |
184 | |||
185 | 51624 | x1 = data[-T1 + 1]; | |
186 | 51624 | x2 = data[-T1]; | |
187 | 51624 | x3 = data[-T1 - 1]; | |
188 | 51624 | x4 = data[-T1 - 2]; | |
189 | |||
190 |
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6246504 | for (i = 0; i < CELT_OVERLAP; i++) { |
191 | 6194880 | float w = ff_celt_window2[i]; | |
192 | 6194880 | x0 = data[i - T1 + 2]; | |
193 | |||
194 | 6194880 | data[i] += (1.0 - w) * g00 * data[i - T0] + | |
195 | 6194880 | (1.0 - w) * g01 * (data[i - T0 - 1] + data[i - T0 + 1]) + | |
196 | 6194880 | (1.0 - w) * g02 * (data[i - T0 - 2] + data[i - T0 + 2]) + | |
197 | 6194880 | w * g10 * x2 + | |
198 | 6194880 | w * g11 * (x1 + x3) + | |
199 | 6194880 | w * g12 * (x0 + x4); | |
200 | 6194880 | x4 = x3; | |
201 | 6194880 | x3 = x2; | |
202 | 6194880 | x2 = x1; | |
203 | 6194880 | x1 = x0; | |
204 | } | ||
205 | } | ||
206 | |||
207 | 56826 | static void celt_postfilter(CeltFrame *f, CeltBlock *block) | |
208 | { | ||
209 | 56826 | int len = f->blocksize * f->blocks; | |
210 | 56826 | const int filter_len = len - 2 * CELT_OVERLAP; | |
211 | |||
212 | 56826 | celt_postfilter_apply_transition(block, block->buf + 1024); | |
213 | |||
214 | 56826 | block->pf_period_old = block->pf_period; | |
215 | 56826 | memcpy(block->pf_gains_old, block->pf_gains, sizeof(block->pf_gains)); | |
216 | |||
217 | 56826 | block->pf_period = block->pf_period_new; | |
218 | 56826 | memcpy(block->pf_gains, block->pf_gains_new, sizeof(block->pf_gains)); | |
219 | |||
220 |
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56826 | if (len > CELT_OVERLAP) { |
221 | 32476 | celt_postfilter_apply_transition(block, block->buf + 1024 + CELT_OVERLAP); | |
222 | |||
223 |
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32476 | if (block->pf_gains[0] > FLT_EPSILON && filter_len > 0) |
224 | 10126 | f->opusdsp.postfilter(block->buf + 1024 + 2 * CELT_OVERLAP, | |
225 | 10126 | block->pf_period, block->pf_gains, | |
226 | filter_len); | ||
227 | |||
228 | 32476 | block->pf_period_old = block->pf_period; | |
229 | 32476 | memcpy(block->pf_gains_old, block->pf_gains, sizeof(block->pf_gains)); | |
230 | } | ||
231 | |||
232 | 56826 | memmove(block->buf, block->buf + len, (1024 + CELT_OVERLAP / 2) * sizeof(float)); | |
233 | 56826 | } | |
234 | |||
235 | 29947 | static int parse_postfilter(CeltFrame *f, OpusRangeCoder *rc, int consumed) | |
236 | { | ||
237 | int i; | ||
238 | |||
239 | 29947 | memset(f->block[0].pf_gains_new, 0, sizeof(f->block[0].pf_gains_new)); | |
240 | 29947 | memset(f->block[1].pf_gains_new, 0, sizeof(f->block[1].pf_gains_new)); | |
241 | |||
242 |
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29947 | if (f->start_band == 0 && consumed + 16 <= f->framebits) { |
243 | 24832 | int has_postfilter = ff_opus_rc_dec_log(rc, 1); | |
244 |
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24832 | if (has_postfilter) { |
245 | float gain; | ||
246 | int tapset, octave, period; | ||
247 | |||
248 | 15874 | octave = ff_opus_rc_dec_uint(rc, 6); | |
249 | 15874 | period = (16 << octave) + ff_opus_rc_get_raw(rc, 4 + octave) - 1; | |
250 | 15874 | gain = 0.09375f * (ff_opus_rc_get_raw(rc, 3) + 1); | |
251 | 15874 | tapset = (opus_rc_tell(rc) + 2 <= f->framebits) ? | |
252 |
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15874 | ff_opus_rc_dec_cdf(rc, ff_celt_model_tapset) : 0; |
253 | |||
254 |
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47622 | for (i = 0; i < 2; i++) { |
255 | 31748 | CeltBlock *block = &f->block[i]; | |
256 | |||
257 | 31748 | block->pf_period_new = FFMAX(period, CELT_POSTFILTER_MINPERIOD); | |
258 | 31748 | block->pf_gains_new[0] = gain * ff_celt_postfilter_taps[tapset][0]; | |
259 | 31748 | block->pf_gains_new[1] = gain * ff_celt_postfilter_taps[tapset][1]; | |
260 | 31748 | block->pf_gains_new[2] = gain * ff_celt_postfilter_taps[tapset][2]; | |
261 | } | ||
262 | } | ||
263 | |||
264 | 24832 | consumed = opus_rc_tell(rc); | |
265 | } | ||
266 | |||
267 | 29947 | return consumed; | |
268 | } | ||
269 | |||
270 | 2793 | static void process_anticollapse(CeltFrame *f, CeltBlock *block, float *X) | |
271 | { | ||
272 | int i, j, k; | ||
273 | |||
274 |
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38329 | for (i = f->start_band; i < f->end_band; i++) { |
275 | 35536 | int renormalize = 0; | |
276 | float *xptr; | ||
277 | float prev[2]; | ||
278 | float Ediff, r; | ||
279 | float thresh, sqrt_1; | ||
280 | int depth; | ||
281 | |||
282 | /* depth in 1/8 bits */ | ||
283 | 35536 | depth = (1 + f->pulses[i]) / (ff_celt_freq_range[i] << f->size); | |
284 | 35536 | thresh = exp2f(-1.0 - 0.125f * depth); | |
285 | 35536 | sqrt_1 = 1.0f / sqrtf(ff_celt_freq_range[i] << f->size); | |
286 | |||
287 | 35536 | xptr = X + (ff_celt_freq_bands[i] << f->size); | |
288 | |||
289 | 35536 | prev[0] = block->prev_energy[0][i]; | |
290 | 35536 | prev[1] = block->prev_energy[1][i]; | |
291 |
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35536 | if (f->channels == 1) { |
292 | 10086 | CeltBlock *block1 = &f->block[1]; | |
293 | |||
294 |
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10086 | prev[0] = FFMAX(prev[0], block1->prev_energy[0][i]); |
295 |
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10086 | prev[1] = FFMAX(prev[1], block1->prev_energy[1][i]); |
296 | } | ||
297 |
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35536 | Ediff = block->energy[i] - FFMIN(prev[0], prev[1]); |
298 |
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35536 | Ediff = FFMAX(0, Ediff); |
299 | |||
300 | /* r needs to be multiplied by 2 or 2*sqrt(2) depending on LM because | ||
301 | short blocks don't have the same energy as long */ | ||
302 | 35536 | r = exp2f(1 - Ediff); | |
303 |
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35536 | if (f->size == 3) |
304 | 23975 | r *= M_SQRT2; | |
305 |
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35536 | r = FFMIN(thresh, r) * sqrt_1; |
306 |
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273580 | for (k = 0; k < 1 << f->size; k++) { |
307 | /* Detect collapse */ | ||
308 |
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238044 | if (!(block->collapse_masks[i] & 1 << k)) { |
309 | /* Fill with noise */ | ||
310 |
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121060 | for (j = 0; j < ff_celt_freq_range[i]; j++) |
311 |
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100329 | xptr[(j << f->size) + k] = (celt_rng(f) & 0x8000) ? r : -r; |
312 | 20731 | renormalize = 1; | |
313 | } | ||
314 | } | ||
315 | |||
316 | /* We just added some energy, so we need to renormalize */ | ||
317 |
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35536 | if (renormalize) |
318 | 8841 | celt_renormalize_vector(xptr, ff_celt_freq_range[i] << f->size, 1.0f); | |
319 | } | ||
320 | 2793 | } | |
321 | |||
322 | 29947 | int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc, | |
323 | float **output, int channels, int frame_size, | ||
324 | int start_band, int end_band) | ||
325 | { | ||
326 | 29947 | int i, j, downmix = 0; | |
327 | int consumed; // bits of entropy consumed thus far for this frame | ||
328 | AVTXContext *imdct; | ||
329 | av_tx_fn imdct_fn; | ||
330 | |||
331 |
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29947 | if (channels != 1 && channels != 2) { |
332 | ✗ | av_log(f->avctx, AV_LOG_ERROR, "Invalid number of coded channels: %d\n", | |
333 | channels); | ||
334 | ✗ | return AVERROR_INVALIDDATA; | |
335 | } | ||
336 |
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29947 | if (start_band < 0 || start_band > end_band || end_band > CELT_MAX_BANDS) { |
337 | ✗ | av_log(f->avctx, AV_LOG_ERROR, "Invalid start/end band: %d %d\n", | |
338 | start_band, end_band); | ||
339 | ✗ | return AVERROR_INVALIDDATA; | |
340 | } | ||
341 | |||
342 | 29947 | f->silence = 0; | |
343 | 29947 | f->transient = 0; | |
344 | 29947 | f->anticollapse = 0; | |
345 | 29947 | f->flushed = 0; | |
346 | 29947 | f->channels = channels; | |
347 | 29947 | f->start_band = start_band; | |
348 | 29947 | f->end_band = end_band; | |
349 | 29947 | f->framebits = rc->rb.bytes * 8; | |
350 | |||
351 | 29947 | f->size = av_log2(frame_size / CELT_SHORT_BLOCKSIZE); | |
352 |
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29947 | if (f->size > CELT_MAX_LOG_BLOCKS || |
353 |
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29947 | frame_size != CELT_SHORT_BLOCKSIZE * (1 << f->size)) { |
354 | ✗ | av_log(f->avctx, AV_LOG_ERROR, "Invalid CELT frame size: %d\n", | |
355 | frame_size); | ||
356 | ✗ | return AVERROR_INVALIDDATA; | |
357 | } | ||
358 | |||
359 |
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29947 | if (!f->output_channels) |
360 | ✗ | f->output_channels = channels; | |
361 | |||
362 |
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78692 | for (i = 0; i < f->channels; i++) { |
363 | 48745 | memset(f->block[i].coeffs, 0, sizeof(f->block[i].coeffs)); | |
364 | 48745 | memset(f->block[i].collapse_masks, 0, sizeof(f->block[i].collapse_masks)); | |
365 | } | ||
366 | |||
367 | 29947 | consumed = opus_rc_tell(rc); | |
368 | |||
369 | /* obtain silence flag */ | ||
370 |
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29947 | if (consumed >= f->framebits) |
371 | ✗ | f->silence = 1; | |
372 |
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29947 | else if (consumed == 1) |
373 | 24958 | f->silence = ff_opus_rc_dec_log(rc, 15); | |
374 | |||
375 | |||
376 |
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29947 | if (f->silence) { |
377 | 126 | consumed = f->framebits; | |
378 | 126 | rc->total_bits += f->framebits - opus_rc_tell(rc); | |
379 | } | ||
380 | |||
381 | /* obtain post-filter options */ | ||
382 | 29947 | consumed = parse_postfilter(f, rc, consumed); | |
383 | |||
384 | /* obtain transient flag */ | ||
385 |
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29947 | if (f->size != 0 && consumed+3 <= f->framebits) |
386 | 16152 | f->transient = ff_opus_rc_dec_log(rc, 3); | |
387 | |||
388 |
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29947 | f->blocks = f->transient ? 1 << f->size : 1; |
389 | 29947 | f->blocksize = frame_size / f->blocks; | |
390 | |||
391 |
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29947 | imdct = f->tx[f->transient ? 0 : f->size]; |
392 |
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29947 | imdct_fn = f->tx_fn[f->transient ? 0 : f->size]; |
393 | |||
394 |
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29947 | if (channels == 1) { |
395 |
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245278 | for (i = 0; i < CELT_MAX_BANDS; i++) |
396 |
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234129 | f->block[0].energy[i] = FFMAX(f->block[0].energy[i], f->block[1].energy[i]); |
397 | } | ||
398 | |||
399 | 29947 | celt_decode_coarse_energy(f, rc); | |
400 | 29947 | celt_decode_tf_changes (f, rc); | |
401 | 29947 | ff_celt_bitalloc (f, rc, 0); | |
402 | 29947 | celt_decode_fine_energy (f, rc); | |
403 | 29947 | ff_celt_quant_bands (f, rc); | |
404 | |||
405 |
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29947 | if (f->anticollapse_needed) |
406 | 3158 | f->anticollapse = ff_opus_rc_get_raw(rc, 1); | |
407 | |||
408 | 29947 | celt_decode_final_energy(f, rc); | |
409 | |||
410 | /* apply anti-collapse processing and denormalization to | ||
411 | * each coded channel */ | ||
412 |
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78692 | for (i = 0; i < f->channels; i++) { |
413 | 48745 | CeltBlock *block = &f->block[i]; | |
414 | |||
415 |
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48745 | if (f->anticollapse) |
416 | 2793 | process_anticollapse(f, block, f->block[i].coeffs); | |
417 | |||
418 | 48745 | celt_denormalize(f, block, f->block[i].coeffs); | |
419 | } | ||
420 | |||
421 | /* stereo -> mono downmix */ | ||
422 |
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29947 | if (f->output_channels < f->channels) { |
423 | ✗ | f->dsp->vector_fmac_scalar(f->block[0].coeffs, f->block[1].coeffs, 1.0, FFALIGN(frame_size, 16)); | |
424 | ✗ | downmix = 1; | |
425 |
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29947 | } else if (f->output_channels > f->channels) |
426 | 8081 | memcpy(f->block[1].coeffs, f->block[0].coeffs, frame_size * sizeof(float)); | |
427 | |||
428 |
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|
29947 | if (f->silence) { |
429 |
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378 | for (i = 0; i < 2; i++) { |
430 | 252 | CeltBlock *block = &f->block[i]; | |
431 | |||
432 |
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5544 | for (j = 0; j < FF_ARRAY_ELEMS(block->energy); j++) |
433 | 5292 | block->energy[j] = CELT_ENERGY_SILENCE; | |
434 | } | ||
435 | 126 | memset(f->block[0].coeffs, 0, sizeof(f->block[0].coeffs)); | |
436 | 126 | memset(f->block[1].coeffs, 0, sizeof(f->block[1].coeffs)); | |
437 | } | ||
438 | |||
439 | /* transform and output for each output channel */ | ||
440 |
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86773 | for (i = 0; i < f->output_channels; i++) { |
441 | 56826 | CeltBlock *block = &f->block[i]; | |
442 | |||
443 | /* iMDCT and overlap-add */ | ||
444 |
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149892 | for (j = 0; j < f->blocks; j++) { |
445 | 93066 | float *dst = block->buf + 1024 + j * f->blocksize; | |
446 | |||
447 | 93066 | imdct_fn(imdct, dst + CELT_OVERLAP / 2, f->block[i].coeffs + j, | |
448 | 93066 | sizeof(float)*f->blocks); | |
449 | 93066 | f->dsp->vector_fmul_window(dst, dst, dst + CELT_OVERLAP / 2, | |
450 | ff_celt_window, CELT_OVERLAP / 2); | ||
451 | } | ||
452 | |||
453 |
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56826 | if (downmix) |
454 | ✗ | f->dsp->vector_fmul_scalar(&block->buf[1024], &block->buf[1024], 0.5f, frame_size); | |
455 | |||
456 | /* postfilter */ | ||
457 | 56826 | celt_postfilter(f, block); | |
458 | |||
459 | /* deemphasis */ | ||
460 | 56826 | block->emph_coeff = f->opusdsp.deemphasis(output[i], | |
461 | 56826 | &block->buf[1024 - frame_size], | |
462 | block->emph_coeff, frame_size); | ||
463 | } | ||
464 | |||
465 |
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29947 | if (channels == 1) |
466 | 11149 | memcpy(f->block[1].energy, f->block[0].energy, sizeof(f->block[0].energy)); | |
467 | |||
468 |
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89841 | for (i = 0; i < 2; i++ ) { |
469 | 59894 | CeltBlock *block = &f->block[i]; | |
470 | |||
471 |
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|
59894 | if (!f->transient) { |
472 | 51806 | memcpy(block->prev_energy[1], block->prev_energy[0], sizeof(block->prev_energy[0])); | |
473 | 51806 | memcpy(block->prev_energy[0], block->energy, sizeof(block->prev_energy[0])); | |
474 | } else { | ||
475 |
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177936 | for (j = 0; j < CELT_MAX_BANDS; j++) |
476 |
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|
169848 | block->prev_energy[0][j] = FFMIN(block->prev_energy[0][j], block->energy[j]); |
477 | } | ||
478 | |||
479 |
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229520 | for (j = 0; j < f->start_band; j++) { |
480 | 169626 | block->prev_energy[0][j] = CELT_ENERGY_SILENCE; | |
481 | 169626 | block->energy[j] = 0.0; | |
482 | } | ||
483 |
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130774 | for (j = f->end_band; j < CELT_MAX_BANDS; j++) { |
484 | 70880 | block->prev_energy[0][j] = CELT_ENERGY_SILENCE; | |
485 | 70880 | block->energy[j] = 0.0; | |
486 | } | ||
487 | } | ||
488 | |||
489 | 29947 | f->seed = rc->range; | |
490 | |||
491 | 29947 | return 0; | |
492 | } | ||
493 | |||
494 | 4622 | void ff_celt_flush(CeltFrame *f) | |
495 | { | ||
496 | int i, j; | ||
497 | |||
498 |
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4622 | if (f->flushed) |
499 | 4541 | return; | |
500 | |||
501 |
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|
243 | for (i = 0; i < 2; i++) { |
502 | 162 | CeltBlock *block = &f->block[i]; | |
503 | |||
504 |
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3564 | for (j = 0; j < CELT_MAX_BANDS; j++) |
505 | 3402 | block->prev_energy[0][j] = block->prev_energy[1][j] = CELT_ENERGY_SILENCE; | |
506 | |||
507 | 162 | memset(block->energy, 0, sizeof(block->energy)); | |
508 | 162 | memset(block->buf, 0, sizeof(block->buf)); | |
509 | |||
510 | 162 | memset(block->pf_gains, 0, sizeof(block->pf_gains)); | |
511 | 162 | memset(block->pf_gains_old, 0, sizeof(block->pf_gains_old)); | |
512 | 162 | memset(block->pf_gains_new, 0, sizeof(block->pf_gains_new)); | |
513 | |||
514 | /* libopus uses CELT_EMPH_COEFF on init, but 0 is better since there's | ||
515 | * a lesser discontinuity when seeking. | ||
516 | * The deemphasis functions differ from libopus in that they require | ||
517 | * an initial state divided by the coefficient. */ | ||
518 | 162 | block->emph_coeff = 0.0f / CELT_EMPH_COEFF; | |
519 | } | ||
520 | 81 | f->seed = 0; | |
521 | |||
522 | 81 | f->flushed = 1; | |
523 | } | ||
524 | |||
525 | 58 | void ff_celt_free(CeltFrame **f) | |
526 | { | ||
527 | 58 | CeltFrame *frm = *f; | |
528 | int i; | ||
529 | |||
530 |
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58 | if (!frm) |
531 | ✗ | return; | |
532 | |||
533 |
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290 | for (i = 0; i < FF_ARRAY_ELEMS(frm->tx); i++) |
534 | 232 | av_tx_uninit(&frm->tx[i]); | |
535 | |||
536 | 58 | ff_celt_pvq_uninit(&frm->pvq); | |
537 | |||
538 | 58 | av_freep(&frm->dsp); | |
539 | 58 | av_freep(f); | |
540 | } | ||
541 | |||
542 | 58 | int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels, | |
543 | int apply_phase_inv) | ||
544 | { | ||
545 | CeltFrame *frm; | ||
546 | int i, ret; | ||
547 | |||
548 |
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58 | if (output_channels != 1 && output_channels != 2) { |
549 | ✗ | av_log(avctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n", | |
550 | output_channels); | ||
551 | ✗ | return AVERROR(EINVAL); | |
552 | } | ||
553 | |||
554 | 58 | frm = av_mallocz(sizeof(*frm)); | |
555 |
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|
58 | if (!frm) |
556 | ✗ | return AVERROR(ENOMEM); | |
557 | |||
558 | 58 | frm->avctx = avctx; | |
559 | 58 | frm->output_channels = output_channels; | |
560 | 58 | frm->apply_phase_inv = apply_phase_inv; | |
561 | |||
562 |
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290 | for (i = 0; i < FF_ARRAY_ELEMS(frm->tx); i++) { |
563 | 232 | const float scale = -1.0f/32768; | |
564 |
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232 | if ((ret = av_tx_init(&frm->tx[i], &frm->tx_fn[i], AV_TX_FLOAT_MDCT, 1, 15 << (i + 3), &scale, 0)) < 0) |
565 | ✗ | goto fail; | |
566 | } | ||
567 | |||
568 |
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|
58 | if ((ret = ff_celt_pvq_init(&frm->pvq, 0)) < 0) |
569 | ✗ | goto fail; | |
570 | |||
571 | 58 | frm->dsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT); | |
572 |
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58 | if (!frm->dsp) { |
573 | ✗ | ret = AVERROR(ENOMEM); | |
574 | ✗ | goto fail; | |
575 | } | ||
576 | |||
577 | 58 | ff_opus_dsp_init(&frm->opusdsp); | |
578 | 58 | ff_celt_flush(frm); | |
579 | |||
580 | 58 | *f = frm; | |
581 | |||
582 | 58 | return 0; | |
583 | ✗ | fail: | |
584 | ✗ | ff_celt_free(&frm); | |
585 | ✗ | return ret; | |
586 | } | ||
587 |