2 * SIPR decoder for the 16k mode
4 * Copyright (c) 2008 Vladimir Voroshilov
5 * Copyright (c) 2009 Vitor Sessak
7 * This file is part of Libav.
9 * Libav 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.
14 * Libav 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.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with Libav; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "libavutil/attributes.h"
28 #include "libavutil/common.h"
29 #include "libavutil/float_dsp.h"
30 #include "libavutil/mathematics.h"
32 #include "celp_filters.h"
33 #include "acelp_vectors.h"
34 #include "acelp_pitch_delay.h"
35 #include "acelp_filters.h"
36 #include "celp_filters.h"
38 #include "sipr16kdata.h"
41 * Convert an lsf vector into an lsp vector.
43 * @param lsf input lsf vector
44 * @param lsp output lsp vector
46 static void lsf2lsp(const float *lsf, double *lsp)
50 for (i = 0; i < LP_FILTER_ORDER_16k; i++)
51 lsp[i] = cosf(lsf[i]);
54 static void dequant(float *out, const int *idx, const float *cbs[])
58 for (i = 0; i < 4; i++)
59 memcpy(out + 3*i, cbs[i] + 3*idx[i], 3*sizeof(float));
61 memcpy(out + 12, cbs[4] + 4*idx[4], 4*sizeof(float));
64 static void lsf_decode_fp_16k(float* lsf_history, float* isp_new,
65 const int* parm, int ma_pred)
68 float isp_q[LP_FILTER_ORDER_16k];
70 dequant(isp_q, parm, lsf_codebooks_16k);
72 for (i = 0; i < LP_FILTER_ORDER_16k; i++) {
73 isp_new[i] = (1 - qu[ma_pred]) * isp_q[i]
74 + qu[ma_pred] * lsf_history[i]
78 memcpy(lsf_history, isp_q, LP_FILTER_ORDER_16k * sizeof(float));
81 static int dec_delay3_1st(int index)
86 return 3 * index - 690;
89 static int dec_delay3_2nd(int index, int pit_min, int pit_max,
93 int pitch_delay_min = av_clip(pitch_lag_prev - 10,
94 pit_min, pit_max - 19);
95 return 3 * pitch_delay_min + index - 2;
97 return 3 * pitch_lag_prev;
100 static void postfilter(float *out_data, float* synth, float* iir_mem,
101 float* filt_mem[2], float* mem_preemph)
103 float buf[30 + LP_FILTER_ORDER_16k];
104 float *tmpbuf = buf + LP_FILTER_ORDER_16k;
108 for (i = 0; i < LP_FILTER_ORDER_16k; i++)
109 filt_mem[0][i] = iir_mem[i] * ff_pow_0_5[i];
111 memcpy(tmpbuf - LP_FILTER_ORDER_16k, mem_preemph,
112 LP_FILTER_ORDER_16k*sizeof(*buf));
114 ff_celp_lp_synthesis_filterf(tmpbuf, filt_mem[1], synth, 30,
115 LP_FILTER_ORDER_16k);
117 memcpy(synth - LP_FILTER_ORDER_16k, mem_preemph,
118 LP_FILTER_ORDER_16k * sizeof(*synth));
120 ff_celp_lp_synthesis_filterf(synth, filt_mem[0], synth, 30,
121 LP_FILTER_ORDER_16k);
123 memcpy(out_data + 30 - LP_FILTER_ORDER_16k,
124 synth + 30 - LP_FILTER_ORDER_16k,
125 LP_FILTER_ORDER_16k * sizeof(*synth));
127 ff_celp_lp_synthesis_filterf(out_data + 30, filt_mem[0],
128 synth + 30, 2 * L_SUBFR_16k - 30,
129 LP_FILTER_ORDER_16k);
132 memcpy(mem_preemph, out_data + 2*L_SUBFR_16k - LP_FILTER_ORDER_16k,
133 LP_FILTER_ORDER_16k * sizeof(*synth));
135 FFSWAP(float *, filt_mem[0], filt_mem[1]);
136 for (i = 0, s = 0; i < 30; i++, s += 1.0/30)
137 out_data[i] = tmpbuf[i] + s * (synth[i] - tmpbuf[i]);
141 * Floating point version of ff_acelp_lp_decode().
143 static void acelp_lp_decodef(float *lp_1st, float *lp_2nd,
144 const double *lsp_2nd, const double *lsp_prev)
146 double lsp_1st[LP_FILTER_ORDER_16k];
149 /* LSP values for first subframe (3.2.5 of G.729, Equation 24) */
150 for (i = 0; i < LP_FILTER_ORDER_16k; i++)
151 lsp_1st[i] = (lsp_2nd[i] + lsp_prev[i]) * 0.5;
153 ff_acelp_lspd2lpc(lsp_1st, lp_1st, LP_FILTER_ORDER_16k >> 1);
155 /* LSP values for second subframe (3.2.5 of G.729) */
156 ff_acelp_lspd2lpc(lsp_2nd, lp_2nd, LP_FILTER_ORDER_16k >> 1);
160 * Floating point version of ff_acelp_decode_gain_code().
162 static float acelp_decode_gain_codef(float gain_corr_factor, const float *fc_v,
163 float mr_energy, const float *quant_energy,
164 const float *ma_prediction_coeff,
165 int subframe_size, int ma_pred_order)
167 mr_energy += avpriv_scalarproduct_float_c(quant_energy, ma_prediction_coeff,
170 mr_energy = gain_corr_factor * exp(M_LN10 / 20. * mr_energy) /
171 sqrt((0.01 + avpriv_scalarproduct_float_c(fc_v, fc_v, subframe_size)));
175 #define DIVIDE_BY_3(x) ((x) * 10923 >> 15)
177 void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
180 int frame_size = SUBFRAME_COUNT_16k * L_SUBFR_16k;
181 float *synth = ctx->synth_buf + LP_FILTER_ORDER_16k;
182 float lsf_new[LP_FILTER_ORDER_16k];
183 double lsp_new[LP_FILTER_ORDER_16k];
184 float Az[2][LP_FILTER_ORDER_16k];
185 float fixed_vector[L_SUBFR_16k];
186 float pitch_fac, gain_code;
191 float *excitation = ctx->excitation + 292;
193 lsf_decode_fp_16k(ctx->lsf_history, lsf_new, params->vq_indexes,
194 params->ma_pred_switch);
196 ff_set_min_dist_lsf(lsf_new, LSFQ_DIFF_MIN / 2, LP_FILTER_ORDER_16k);
198 lsf2lsp(lsf_new, lsp_new);
200 acelp_lp_decodef(Az[0], Az[1], lsp_new, ctx->lsp_history_16k);
202 memcpy(ctx->lsp_history_16k, lsp_new, LP_FILTER_ORDER_16k * sizeof(double));
204 memcpy(synth - LP_FILTER_ORDER_16k, ctx->synth,
205 LP_FILTER_ORDER_16k * sizeof(*synth));
207 for (i = 0; i < SUBFRAME_COUNT_16k; i++) {
208 int i_subfr = i * L_SUBFR_16k;
210 float gain_corr_factor;
212 int pitch_delay_frac;
215 pitch_delay_3x = dec_delay3_1st(params->pitch_delay[i]);
217 pitch_delay_3x = dec_delay3_2nd(params->pitch_delay[i],
218 PITCH_MIN, PITCH_MAX,
219 ctx->pitch_lag_prev);
221 pitch_fac = gain_pitch_cb_16k[params->gp_index[i]];
222 f.pitch_fac = FFMIN(pitch_fac, 1.0);
223 f.pitch_lag = DIVIDE_BY_3(pitch_delay_3x+1);
224 ctx->pitch_lag_prev = f.pitch_lag;
226 pitch_delay_int = DIVIDE_BY_3(pitch_delay_3x + 2);
227 pitch_delay_frac = pitch_delay_3x + 2 - 3*pitch_delay_int;
229 ff_acelp_interpolatef(&excitation[i_subfr],
230 &excitation[i_subfr] - pitch_delay_int + 1,
231 sinc_win, 3, pitch_delay_frac + 1,
232 LP_FILTER_ORDER, L_SUBFR_16k);
235 memset(fixed_vector, 0, sizeof(fixed_vector));
237 ff_decode_10_pulses_35bits(params->fc_indexes[i], &f,
238 ff_fc_4pulses_8bits_tracks_13, 5, 4);
240 ff_set_fixed_vector(fixed_vector, &f, 1.0, L_SUBFR_16k);
242 gain_corr_factor = gain_cb_16k[params->gc_index[i]];
243 gain_code = gain_corr_factor *
244 acelp_decode_gain_codef(sqrt(L_SUBFR_16k), fixed_vector,
245 19.0 - 15.0/(0.05*M_LN10/M_LN2),
246 pred_16k, ctx->energy_history,
249 ctx->energy_history[1] = ctx->energy_history[0];
250 ctx->energy_history[0] = 20.0 * log10f(gain_corr_factor);
252 ff_weighted_vector_sumf(&excitation[i_subfr], &excitation[i_subfr],
253 fixed_vector, pitch_fac,
254 gain_code, L_SUBFR_16k);
256 ff_celp_lp_synthesis_filterf(synth + i_subfr, Az[i],
257 &excitation[i_subfr], L_SUBFR_16k,
258 LP_FILTER_ORDER_16k);
261 memcpy(ctx->synth, synth + frame_size - LP_FILTER_ORDER_16k,
262 LP_FILTER_ORDER_16k * sizeof(*synth));
264 memmove(ctx->excitation, ctx->excitation + 2 * L_SUBFR_16k,
265 (L_INTERPOL+PITCH_MAX) * sizeof(float));
267 postfilter(out_data, synth, ctx->iir_mem, ctx->filt_mem, ctx->mem_preemph);
269 memcpy(ctx->iir_mem, Az[1], LP_FILTER_ORDER_16k * sizeof(float));
272 av_cold void ff_sipr_init_16k(SiprContext *ctx)
276 for (i = 0; i < LP_FILTER_ORDER_16k; i++)
277 ctx->lsp_history_16k[i] = cos((i + 1) * M_PI/(LP_FILTER_ORDER_16k + 1));
279 ctx->filt_mem[0] = ctx->filt_buf[0];
280 ctx->filt_mem[1] = ctx->filt_buf[1];
282 ctx->pitch_lag_prev = 180;