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1 | /* |
2 | * SIPR decoder for the 16k mode | |
3 | * | |
4 | * Copyright (c) 2008 Vladimir Voroshilov | |
5 | * Copyright (c) 2009 Vitor Sessak | |
6 | * | |
7 | * This file is part of FFmpeg. | |
8 | * | |
9 | * FFmpeg is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * FFmpeg is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with FFmpeg; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | ||
24 | #include <math.h> | |
25 | ||
26 | #include "sipr.h" | |
27 | #include "libavutil/attributes.h" | |
28 | #include "libavutil/common.h" | |
29 | #include "libavutil/float_dsp.h" | |
30 | #include "libavutil/mathematics.h" | |
31 | #include "lsp.h" | |
32 | #include "acelp_vectors.h" | |
33 | #include "acelp_pitch_delay.h" | |
34 | #include "acelp_filters.h" | |
35 | #include "celp_filters.h" | |
36 | ||
37 | #include "sipr16kdata.h" | |
38 | ||
39 | /** | |
40 | * Convert an lsf vector into an lsp vector. | |
41 | * | |
42 | * @param lsf input lsf vector | |
43 | * @param lsp output lsp vector | |
44 | */ | |
45 | static void lsf2lsp(const float *lsf, double *lsp) | |
46 | { | |
47 | int i; | |
48 | ||
49 | for (i = 0; i < LP_FILTER_ORDER_16k; i++) | |
50 | lsp[i] = cosf(lsf[i]); | |
51 | } | |
52 | ||
53 | static void dequant(float *out, const int *idx, const float * const cbs[]) | |
54 | { | |
55 | int i; | |
56 | ||
57 | for (i = 0; i < 4; i++) | |
58 | memcpy(out + 3*i, cbs[i] + 3*idx[i], 3*sizeof(float)); | |
59 | ||
60 | memcpy(out + 12, cbs[4] + 4*idx[4], 4*sizeof(float)); | |
61 | } | |
62 | ||
63 | static void lsf_decode_fp_16k(float* lsf_history, float* isp_new, | |
64 | const int* parm, int ma_pred) | |
65 | { | |
66 | int i; | |
67 | float isp_q[LP_FILTER_ORDER_16k]; | |
68 | ||
69 | dequant(isp_q, parm, lsf_codebooks_16k); | |
70 | ||
71 | for (i = 0; i < LP_FILTER_ORDER_16k; i++) { | |
72 | isp_new[i] = (1 - qu[ma_pred]) * isp_q[i] | |
73 | + qu[ma_pred] * lsf_history[i] | |
74 | + mean_lsf_16k[i]; | |
75 | } | |
76 | ||
77 | memcpy(lsf_history, isp_q, LP_FILTER_ORDER_16k * sizeof(float)); | |
78 | } | |
79 | ||
80 | static int dec_delay3_1st(int index) | |
81 | { | |
82 | if (index < 390) { | |
83 | return index + 88; | |
84 | } else | |
85 | return 3 * index - 690; | |
86 | } | |
87 | ||
88 | static int dec_delay3_2nd(int index, int pit_min, int pit_max, | |
89 | int pitch_lag_prev) | |
90 | { | |
91 | if (index < 62) { | |
92 | int pitch_delay_min = av_clip(pitch_lag_prev - 10, | |
93 | pit_min, pit_max - 19); | |
94 | return 3 * pitch_delay_min + index - 2; | |
95 | } else | |
96 | return 3 * pitch_lag_prev; | |
97 | } | |
98 | ||
99 | static void postfilter(float *out_data, float* synth, float* iir_mem, | |
100 | float* filt_mem[2], float* mem_preemph) | |
101 | { | |
102 | float buf[30 + LP_FILTER_ORDER_16k]; | |
103 | float *tmpbuf = buf + LP_FILTER_ORDER_16k; | |
104 | float s; | |
105 | int i; | |
106 | ||
107 | for (i = 0; i < LP_FILTER_ORDER_16k; i++) | |
108 | filt_mem[0][i] = iir_mem[i] * ff_pow_0_5[i]; | |
109 | ||
110 | memcpy(tmpbuf - LP_FILTER_ORDER_16k, mem_preemph, | |
111 | LP_FILTER_ORDER_16k*sizeof(*buf)); | |
112 | ||
113 | ff_celp_lp_synthesis_filterf(tmpbuf, filt_mem[1], synth, 30, | |
114 | LP_FILTER_ORDER_16k); | |
115 | ||
116 | memcpy(synth - LP_FILTER_ORDER_16k, mem_preemph, | |
117 | LP_FILTER_ORDER_16k * sizeof(*synth)); | |
118 | ||
119 | ff_celp_lp_synthesis_filterf(synth, filt_mem[0], synth, 30, | |
120 | LP_FILTER_ORDER_16k); | |
121 | ||
122 | memcpy(out_data + 30 - LP_FILTER_ORDER_16k, | |
123 | synth + 30 - LP_FILTER_ORDER_16k, | |
124 | LP_FILTER_ORDER_16k * sizeof(*synth)); | |
125 | ||
126 | ff_celp_lp_synthesis_filterf(out_data + 30, filt_mem[0], | |
127 | synth + 30, 2 * L_SUBFR_16k - 30, | |
128 | LP_FILTER_ORDER_16k); | |
129 | ||
130 | ||
131 | memcpy(mem_preemph, out_data + 2*L_SUBFR_16k - LP_FILTER_ORDER_16k, | |
132 | LP_FILTER_ORDER_16k * sizeof(*synth)); | |
133 | ||
134 | FFSWAP(float *, filt_mem[0], filt_mem[1]); | |
135 | for (i = 0, s = 0; i < 30; i++, s += 1.0/30) | |
136 | out_data[i] = tmpbuf[i] + s * (synth[i] - tmpbuf[i]); | |
137 | } | |
138 | ||
139 | /** | |
140 | * Floating point version of ff_acelp_lp_decode(). | |
141 | */ | |
142 | static void acelp_lp_decodef(float *lp_1st, float *lp_2nd, | |
143 | const double *lsp_2nd, const double *lsp_prev) | |
144 | { | |
145 | double lsp_1st[LP_FILTER_ORDER_16k]; | |
146 | int i; | |
147 | ||
148 | /* LSP values for first subframe (3.2.5 of G.729, Equation 24) */ | |
149 | for (i = 0; i < LP_FILTER_ORDER_16k; i++) | |
150 | lsp_1st[i] = (lsp_2nd[i] + lsp_prev[i]) * 0.5; | |
151 | ||
152 | ff_acelp_lspd2lpc(lsp_1st, lp_1st, LP_FILTER_ORDER_16k >> 1); | |
153 | ||
154 | /* LSP values for second subframe (3.2.5 of G.729) */ | |
155 | ff_acelp_lspd2lpc(lsp_2nd, lp_2nd, LP_FILTER_ORDER_16k >> 1); | |
156 | } | |
157 | ||
158 | /** | |
159 | * Floating point version of ff_acelp_decode_gain_code(). | |
160 | */ | |
161 | static float acelp_decode_gain_codef(float gain_corr_factor, const float *fc_v, | |
162 | float mr_energy, const float *quant_energy, | |
163 | const float *ma_prediction_coeff, | |
164 | int subframe_size, int ma_pred_order) | |
165 | { | |
166 | mr_energy += avpriv_scalarproduct_float_c(quant_energy, ma_prediction_coeff, | |
167 | ma_pred_order); | |
168 | ||
169 | mr_energy = gain_corr_factor * exp(M_LN10 / 20. * mr_energy) / | |
170 | sqrt((0.01 + avpriv_scalarproduct_float_c(fc_v, fc_v, subframe_size))); | |
171 | return mr_energy; | |
172 | } | |
173 | ||
174 | #define DIVIDE_BY_3(x) ((x) * 10923 >> 15) | |
175 | ||
176 | void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params, | |
177 | float *out_data) | |
178 | { | |
179 | int frame_size = SUBFRAME_COUNT_16k * L_SUBFR_16k; | |
180 | float *synth = ctx->synth_buf + LP_FILTER_ORDER_16k; | |
181 | float lsf_new[LP_FILTER_ORDER_16k]; | |
182 | double lsp_new[LP_FILTER_ORDER_16k]; | |
183 | float Az[2][LP_FILTER_ORDER_16k]; | |
184 | float fixed_vector[L_SUBFR_16k]; | |
185 | float pitch_fac, gain_code; | |
186 | ||
187 | int i; | |
188 | int pitch_delay_3x; | |
189 | ||
190 | float *excitation = ctx->excitation + 292; | |
191 | ||
192 | lsf_decode_fp_16k(ctx->lsf_history, lsf_new, params->vq_indexes, | |
193 | params->ma_pred_switch); | |
194 | ||
195 | ff_set_min_dist_lsf(lsf_new, LSFQ_DIFF_MIN / 2, LP_FILTER_ORDER_16k); | |
196 | ||
197 | lsf2lsp(lsf_new, lsp_new); | |
198 | ||
199 | acelp_lp_decodef(Az[0], Az[1], lsp_new, ctx->lsp_history_16k); | |
200 | ||
201 | memcpy(ctx->lsp_history_16k, lsp_new, LP_FILTER_ORDER_16k * sizeof(double)); | |
202 | ||
203 | memcpy(synth - LP_FILTER_ORDER_16k, ctx->synth, | |
204 | LP_FILTER_ORDER_16k * sizeof(*synth)); | |
205 | ||
206 | for (i = 0; i < SUBFRAME_COUNT_16k; i++) { | |
207 | int i_subfr = i * L_SUBFR_16k; | |
208 | AMRFixed f; | |
209 | float gain_corr_factor; | |
210 | int pitch_delay_int; | |
211 | int pitch_delay_frac; | |
212 | ||
213 | if (!i) { | |
214 | pitch_delay_3x = dec_delay3_1st(params->pitch_delay[i]); | |
215 | } else | |
216 | pitch_delay_3x = dec_delay3_2nd(params->pitch_delay[i], | |
217 | PITCH_MIN, PITCH_MAX, | |
218 | ctx->pitch_lag_prev); | |
219 | ||
220 | pitch_fac = gain_pitch_cb_16k[params->gp_index[i]]; | |
221 | f.pitch_fac = FFMIN(pitch_fac, 1.0); | |
222 | f.pitch_lag = DIVIDE_BY_3(pitch_delay_3x+1); | |
223 | ctx->pitch_lag_prev = f.pitch_lag; | |
224 | ||
225 | pitch_delay_int = DIVIDE_BY_3(pitch_delay_3x + 2); | |
226 | pitch_delay_frac = pitch_delay_3x + 2 - 3*pitch_delay_int; | |
227 | ||
228 | ff_acelp_interpolatef(&excitation[i_subfr], | |
229 | &excitation[i_subfr] - pitch_delay_int + 1, | |
230 | sinc_win, 3, pitch_delay_frac + 1, | |
231 | LP_FILTER_ORDER, L_SUBFR_16k); | |
232 | ||
233 | ||
234 | memset(fixed_vector, 0, sizeof(fixed_vector)); | |
235 | ||
236 | ff_decode_10_pulses_35bits(params->fc_indexes[i], &f, | |
237 | ff_fc_4pulses_8bits_tracks_13, 5, 4); | |
238 | ||
239 | ff_set_fixed_vector(fixed_vector, &f, 1.0, L_SUBFR_16k); | |
240 | ||
241 | gain_corr_factor = gain_cb_16k[params->gc_index[i]]; | |
242 | gain_code = gain_corr_factor * | |
243 | acelp_decode_gain_codef(sqrt(L_SUBFR_16k), fixed_vector, | |
244 | 19.0 - 15.0/(0.05*M_LN10/M_LN2), | |
245 | pred_16k, ctx->energy_history, | |
246 | L_SUBFR_16k, 2); | |
247 | ||
248 | ctx->energy_history[1] = ctx->energy_history[0]; | |
249 | ctx->energy_history[0] = 20.0 * log10f(gain_corr_factor); | |
250 | ||
251 | ff_weighted_vector_sumf(&excitation[i_subfr], &excitation[i_subfr], | |
252 | fixed_vector, pitch_fac, | |
253 | gain_code, L_SUBFR_16k); | |
254 | ||
255 | ff_celp_lp_synthesis_filterf(synth + i_subfr, Az[i], | |
256 | &excitation[i_subfr], L_SUBFR_16k, | |
257 | LP_FILTER_ORDER_16k); | |
258 | ||
259 | } | |
260 | memcpy(ctx->synth, synth + frame_size - LP_FILTER_ORDER_16k, | |
261 | LP_FILTER_ORDER_16k * sizeof(*synth)); | |
262 | ||
263 | memmove(ctx->excitation, ctx->excitation + 2 * L_SUBFR_16k, | |
264 | (L_INTERPOL+PITCH_MAX) * sizeof(float)); | |
265 | ||
266 | postfilter(out_data, synth, ctx->iir_mem, ctx->filt_mem, ctx->mem_preemph); | |
267 | ||
268 | memcpy(ctx->iir_mem, Az[1], LP_FILTER_ORDER_16k * sizeof(float)); | |
269 | } | |
270 | ||
271 | av_cold void ff_sipr_init_16k(SiprContext *ctx) | |
272 | { | |
273 | int i; | |
274 | ||
275 | for (i = 0; i < LP_FILTER_ORDER_16k; i++) | |
276 | ctx->lsp_history_16k[i] = cos((i + 1) * M_PI/(LP_FILTER_ORDER_16k + 1)); | |
277 | ||
278 | ctx->filt_mem[0] = ctx->filt_buf[0]; | |
279 | ctx->filt_mem[1] = ctx->filt_buf[1]; | |
280 | ||
281 | ctx->pitch_lag_prev = 180; | |
282 | } |