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1 | /* |
2 | * adaptive and fixed codebook vector operations for ACELP-based codecs | |
3 | * | |
4 | * Copyright (c) 2008 Vladimir Voroshilov | |
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 | #ifndef AVCODEC_ACELP_VECTORS_H | |
24 | #define AVCODEC_ACELP_VECTORS_H | |
25 | ||
26 | #include <stdint.h> | |
27 | ||
28 | typedef struct ACELPVContext { | |
29 | /** | |
30 | * float implementation of weighted sum of two vectors. | |
31 | * @param[out] out result of addition | |
32 | * @param in_a first vector | |
33 | * @param in_b second vector | |
34 | * @param weight_coeff_a first vector weight coefficient | |
35 | * @param weight_coeff_a second vector weight coefficient | |
36 | * @param length vectors length (should be a multiple of two) | |
37 | * | |
38 | * @note It is safe to pass the same buffer for out and in_a or in_b. | |
39 | */ | |
40 | void (*weighted_vector_sumf)(float *out, const float *in_a, const float *in_b, | |
41 | float weight_coeff_a, float weight_coeff_b, | |
42 | int length); | |
43 | ||
44 | }ACELPVContext; | |
45 | ||
46 | /** | |
47 | * Initialize ACELPVContext. | |
48 | */ | |
49 | void ff_acelp_vectors_init(ACELPVContext *c); | |
50 | void ff_acelp_vectors_init_mips(ACELPVContext *c); | |
51 | ||
52 | /** Sparse representation for the algebraic codebook (fixed) vector */ | |
53 | typedef struct AMRFixed { | |
54 | int n; | |
55 | int x[10]; | |
56 | float y[10]; | |
57 | int no_repeat_mask; | |
58 | int pitch_lag; | |
59 | float pitch_fac; | |
60 | } AMRFixed; | |
61 | ||
62 | /** | |
63 | * Track|Pulse| Positions | |
64 | * ------------------------------------------------------------------------- | |
65 | * 1 | 0 | 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 | |
66 | * ------------------------------------------------------------------------- | |
67 | * 2 | 1 | 1, 6, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61, 66, 71, 76 | |
68 | * ------------------------------------------------------------------------- | |
69 | * 3 | 2 | 2, 7, 12, 17, 22, 27, 32, 37, 42, 47, 52, 57, 62, 67, 72, 77 | |
70 | * ------------------------------------------------------------------------- | |
71 | * | |
72 | * Table contains only first the pulse indexes. | |
73 | * | |
74 | * Used in G.729 @@8k, G.729 @@4.4k, AMR @@7.95k, AMR @@7.40k | |
75 | */ | |
76 | extern const uint8_t ff_fc_4pulses_8bits_tracks_13[16]; | |
77 | ||
78 | /** | |
79 | * Track|Pulse| Positions | |
80 | * ------------------------------------------------------------------------- | |
81 | * 4 | 3 | 3, 8, 13, 18, 23, 28, 33, 38, 43, 48, 53, 58, 63, 68, 73, 78 | |
82 | * | | 4, 9, 14, 19, 24, 29, 34, 39, 44, 49, 54, 59, 64, 69, 74, 79 | |
83 | * ------------------------------------------------------------------------- | |
84 | * | |
85 | * @remark Track in the table should be read top-to-bottom, left-to-right. | |
86 | * | |
87 | * Used in G.729 @@8k, G.729 @@4.4k, AMR @@7.95k, AMR @@7.40k | |
88 | */ | |
89 | extern const uint8_t ff_fc_4pulses_8bits_track_4[32]; | |
90 | ||
91 | /** | |
92 | * Track|Pulse| Positions | |
93 | * ----------------------------------------- | |
94 | * 1 | 0 | 1, 6, 11, 16, 21, 26, 31, 36 | |
95 | * | | 3, 8, 13, 18, 23, 28, 33, 38 | |
96 | * ----------------------------------------- | |
97 | * | |
98 | * @remark Track in the table should be read top-to-bottom, left-to-right. | |
99 | * | |
100 | * @note (EE) Reference G.729D code also uses gray decoding for each | |
101 | * pulse index before looking up the value in the table. | |
102 | * | |
103 | * Used in G.729 @@6.4k (with gray coding), AMR @@5.9k (without gray coding) | |
104 | */ | |
105 | extern const uint8_t ff_fc_2pulses_9bits_track1[16]; | |
106 | extern const uint8_t ff_fc_2pulses_9bits_track1_gray[16]; | |
107 | ||
108 | /** | |
109 | * Track|Pulse| Positions | |
110 | * ----------------------------------------- | |
111 | * 2 | 1 | 0, 7, 14, 20, 27, 34, 1, 21 | |
112 | * | | 2, 9, 15, 22, 29, 35, 6, 26 | |
113 | * | | 4,10, 17, 24, 30, 37, 11, 31 | |
114 | * | | 5,12, 19, 25, 32, 39, 16, 36 | |
115 | * ----------------------------------------- | |
116 | * | |
117 | * @remark Track in the table should be read top-to-bottom, left-to-right. | |
118 | * | |
119 | * @note (EE.1) This table (from the reference code) does not comply with | |
120 | * the specification. | |
121 | * The specification contains the following table: | |
122 | * | |
123 | * Track|Pulse| Positions | |
124 | * ----------------------------------------- | |
125 | * 2 | 1 | 0, 5, 10, 15, 20, 25, 30, 35 | |
126 | * | | 1, 6, 11, 16, 21, 26, 31, 36 | |
127 | * | | 2, 7, 12, 17, 22, 27, 32, 37 | |
128 | * | | 4, 9, 14, 19, 24, 29, 34, 39 | |
129 | * | |
130 | * ----------------------------------------- | |
131 | * | |
132 | * @note (EE.2) Reference G.729D code also uses gray decoding for each | |
133 | * pulse index before looking up the value in the table. | |
134 | * | |
135 | * Used in G.729 @@6.4k (with gray coding) | |
136 | */ | |
137 | extern const uint8_t ff_fc_2pulses_9bits_track2_gray[32]; | |
138 | ||
139 | /** | |
140 | * b60 hamming windowed sinc function coefficients | |
141 | */ | |
142 | extern const float ff_b60_sinc[61]; | |
143 | ||
144 | /** | |
145 | * Table of pow(0.7,n) | |
146 | */ | |
147 | extern const float ff_pow_0_7[10]; | |
148 | ||
149 | /** | |
150 | * Table of pow(0.75,n) | |
151 | */ | |
152 | extern const float ff_pow_0_75[10]; | |
153 | ||
154 | /** | |
155 | * Table of pow(0.55,n) | |
156 | */ | |
157 | extern const float ff_pow_0_55[10]; | |
158 | ||
159 | /** | |
160 | * Decode fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR). | |
161 | * @param[out] fc_v decoded fixed codebook vector (2.13) | |
162 | * @param tab1 table used for first pulse_count pulses | |
163 | * @param tab2 table used for last pulse | |
164 | * @param pulse_indexes fixed codebook indexes | |
165 | * @param pulse_signs signs of the excitation pulses (0 bit value | |
166 | * means negative sign) | |
167 | * @param bits number of bits per one pulse index | |
168 | * @param pulse_count number of pulses decoded using first table | |
169 | * @param bits length of one pulse index in bits | |
170 | * | |
171 | * Used in G.729 @@8k, G.729 @@4.4k, G.729 @@6.4k, AMR @@7.95k, AMR @@7.40k | |
172 | */ | |
173 | void ff_acelp_fc_pulse_per_track(int16_t* fc_v, | |
174 | const uint8_t *tab1, | |
175 | const uint8_t *tab2, | |
176 | int pulse_indexes, | |
177 | int pulse_signs, | |
178 | int pulse_count, | |
179 | int bits); | |
180 | ||
181 | /** | |
182 | * Decode the algebraic codebook index to pulse positions and signs and | |
183 | * construct the algebraic codebook vector for MODE_12k2. | |
184 | * | |
185 | * @note: The positions and signs are explicitly coded in MODE_12k2. | |
186 | * | |
187 | * @param fixed_index positions of the ten pulses | |
188 | * @param fixed_sparse pointer to the algebraic codebook vector | |
189 | * @param gray_decode gray decoding table | |
190 | * @param half_pulse_count number of couples of pulses | |
191 | * @param bits length of one pulse index in bits | |
192 | */ | |
193 | void ff_decode_10_pulses_35bits(const int16_t *fixed_index, | |
194 | AMRFixed *fixed_sparse, | |
195 | const uint8_t *gray_decode, | |
196 | int half_pulse_count, int bits); | |
197 | ||
198 | ||
199 | /** | |
200 | * weighted sum of two vectors with rounding. | |
201 | * @param[out] out result of addition | |
202 | * @param in_a first vector | |
203 | * @param in_b second vector | |
204 | * @param weight_coeff_a first vector weight coefficient | |
205 | * @param weight_coeff_a second vector weight coefficient | |
206 | * @param rounder this value will be added to the sum of the two vectors | |
207 | * @param shift result will be shifted to right by this value | |
208 | * @param length vectors length | |
209 | * | |
210 | * @note It is safe to pass the same buffer for out and in_a or in_b. | |
211 | * | |
212 | * out[i] = (in_a[i]*weight_a + in_b[i]*weight_b + rounder) >> shift | |
213 | */ | |
214 | void ff_acelp_weighted_vector_sum(int16_t* out, | |
215 | const int16_t *in_a, | |
216 | const int16_t *in_b, | |
217 | int16_t weight_coeff_a, | |
218 | int16_t weight_coeff_b, | |
219 | int16_t rounder, | |
220 | int shift, | |
221 | int length); | |
222 | ||
223 | /** | |
224 | * float implementation of weighted sum of two vectors. | |
225 | * @param[out] out result of addition | |
226 | * @param in_a first vector | |
227 | * @param in_b second vector | |
228 | * @param weight_coeff_a first vector weight coefficient | |
229 | * @param weight_coeff_a second vector weight coefficient | |
230 | * @param length vectors length | |
231 | * | |
232 | * @note It is safe to pass the same buffer for out and in_a or in_b. | |
233 | */ | |
234 | void ff_weighted_vector_sumf(float *out, const float *in_a, const float *in_b, | |
235 | float weight_coeff_a, float weight_coeff_b, | |
236 | int length); | |
237 | ||
238 | /** | |
239 | * Adaptive gain control (as used in AMR postfiltering) | |
240 | * | |
241 | * @param out output buffer for filtered speech data | |
242 | * @param in the input speech buffer (may be the same as out) | |
243 | * @param speech_energ input energy | |
244 | * @param size the input buffer size | |
245 | * @param alpha exponential filter factor | |
246 | * @param gain_mem a pointer to the filter memory (single float of size) | |
247 | */ | |
248 | void ff_adaptive_gain_control(float *out, const float *in, float speech_energ, | |
249 | int size, float alpha, float *gain_mem); | |
250 | ||
251 | /** | |
252 | * Set the sum of squares of a signal by scaling | |
253 | * | |
254 | * @param out output samples | |
255 | * @param in input samples | |
256 | * @param sum_of_squares new sum of squares | |
257 | * @param n number of samples | |
258 | * | |
259 | * @note If the input is zero (or its energy underflows), the output is zero. | |
260 | * This is the behavior of AGC in the AMR reference decoder. The QCELP | |
261 | * reference decoder seems to have undefined behavior. | |
262 | * | |
263 | * TIA/EIA/IS-733 2.4.8.3-2/3/4/5, 2.4.8.6 | |
264 | * 3GPP TS 26.090 6.1 (6) | |
265 | */ | |
266 | void ff_scale_vector_to_given_sum_of_squares(float *out, const float *in, | |
267 | float sum_of_squares, const int n); | |
268 | ||
269 | /** | |
270 | * Add fixed vector to an array from a sparse representation | |
271 | * | |
272 | * @param out fixed vector with pitch sharpening | |
273 | * @param in sparse fixed vector | |
274 | * @param scale number to multiply the fixed vector by | |
275 | * @param size the output vector size | |
276 | */ | |
277 | void ff_set_fixed_vector(float *out, const AMRFixed *in, float scale, int size); | |
278 | ||
279 | /** | |
280 | * Clear array values set by set_fixed_vector | |
281 | * | |
282 | * @param out fixed vector to be cleared | |
283 | * @param in sparse fixed vector | |
284 | * @param size the output vector size | |
285 | */ | |
286 | void ff_clear_fixed_vector(float *out, const AMRFixed *in, int size); | |
287 | ||
288 | #endif /* AVCODEC_ACELP_VECTORS_H */ |