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 FFmpeg.
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.
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.
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
27 #include "libavutil/common.h"
28 #include "libavutil/mathematics.h"
30 #include "celp_math.h"
31 #include "acelp_vectors.h"
32 #include "acelp_pitch_delay.h"
33 #include "acelp_filters.h"
34 #include "celp_filters.h"
36 #include "sipr16kdata.h"
39 * Convert an lsf vector into an lsp vector.
41 * @param lsf input lsf vector
42 * @param lsp output lsp vector
44 static void lsf2lsp(const float *lsf, double *lsp)
48 for (i = 0; i < LP_FILTER_ORDER_16k; i++)
49 lsp[i] = cosf(lsf[i]);
52 static void dequant(float *out, const int *idx, const float *cbs[])
56 for (i = 0; i < 4; i++)
57 memcpy(out + 3*i, cbs[i] + 3*idx[i], 3*sizeof(float));
59 memcpy(out + 12, cbs[4] + 4*idx[4], 4*sizeof(float));
62 static void lsf_decode_fp_16k(float* lsf_history, float* isp_new,
63 const int* parm, int ma_pred)
66 float isp_q[LP_FILTER_ORDER_16k];
68 dequant(isp_q, parm, lsf_codebooks_16k);
70 for (i = 0; i < LP_FILTER_ORDER_16k; i++) {
71 isp_new[i] = (1 - qu[ma_pred]) * isp_q[i]
72 + qu[ma_pred] * lsf_history[i]
76 memcpy(lsf_history, isp_q, LP_FILTER_ORDER_16k * sizeof(float));
79 static int dec_delay3_1st(int index)
84 return 3 * index - 690;
87 static int dec_delay3_2nd(int index, int pit_min, int pit_max,
91 int pitch_delay_min = av_clip(pitch_lag_prev - 10,
92 pit_min, pit_max - 19);
93 return 3 * pitch_delay_min + index - 2;
95 return 3 * pitch_lag_prev;
98 static void postfilter(float *out_data, float* synth, float* iir_mem,
99 float* filt_mem[2], float* mem_preemph)
101 float buf[30 + LP_FILTER_ORDER_16k];
102 float *tmpbuf = buf + LP_FILTER_ORDER_16k;
106 for (i = 0; i < LP_FILTER_ORDER_16k; i++)
107 filt_mem[0][i] = iir_mem[i] * ff_pow_0_5[i];
109 memcpy(tmpbuf - LP_FILTER_ORDER_16k, mem_preemph,
110 LP_FILTER_ORDER_16k*sizeof(*buf));
112 ff_celp_lp_synthesis_filterf(tmpbuf, filt_mem[1], synth, 30,
113 LP_FILTER_ORDER_16k);
115 memcpy(synth - LP_FILTER_ORDER_16k, mem_preemph,
116 LP_FILTER_ORDER_16k * sizeof(*synth));
118 ff_celp_lp_synthesis_filterf(synth, filt_mem[0], synth, 30,
119 LP_FILTER_ORDER_16k);
121 memcpy(out_data + 30 - LP_FILTER_ORDER_16k,
122 synth + 30 - LP_FILTER_ORDER_16k,
123 LP_FILTER_ORDER_16k * sizeof(*synth));
125 ff_celp_lp_synthesis_filterf(out_data + 30, filt_mem[0],
126 synth + 30, 2 * L_SUBFR_16k - 30,
127 LP_FILTER_ORDER_16k);
130 memcpy(mem_preemph, out_data + 2*L_SUBFR_16k - LP_FILTER_ORDER_16k,
131 LP_FILTER_ORDER_16k * sizeof(*synth));
133 FFSWAP(float *, filt_mem[0], filt_mem[1]);
134 for (i = 0, s = 0; i < 30; i++, s += 1.0/30)
135 out_data[i] = tmpbuf[i] + s * (synth[i] - tmpbuf[i]);
139 * Floating point version of ff_acelp_lp_decode().
141 static void acelp_lp_decodef(float *lp_1st, float *lp_2nd,
142 const double *lsp_2nd, const double *lsp_prev)
144 double lsp_1st[LP_FILTER_ORDER_16k];
147 /* LSP values for first subframe (3.2.5 of G.729, Equation 24) */
148 for (i = 0; i < LP_FILTER_ORDER_16k; i++)
149 lsp_1st[i] = (lsp_2nd[i] + lsp_prev[i]) * 0.5;
151 ff_acelp_lspd2lpc(lsp_1st, lp_1st, LP_FILTER_ORDER_16k >> 1);
153 /* LSP values for second subframe (3.2.5 of G.729) */
154 ff_acelp_lspd2lpc(lsp_2nd, lp_2nd, LP_FILTER_ORDER_16k >> 1);
158 * Floating point version of ff_acelp_decode_gain_code().
160 static float acelp_decode_gain_codef(float gain_corr_factor, const float *fc_v,
161 float mr_energy, const float *quant_energy,
162 const float *ma_prediction_coeff,
163 int subframe_size, int ma_pred_order)
166 ff_dot_productf(quant_energy, ma_prediction_coeff, ma_pred_order);
168 mr_energy = gain_corr_factor * exp(M_LN10 / 20. * mr_energy) /
169 sqrt((0.01 + ff_dot_productf(fc_v, fc_v, subframe_size)));
173 #define DIVIDE_BY_3(x) ((x) * 10923 >> 15)
175 void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
178 int frame_size = SUBFRAME_COUNT_16k * L_SUBFR_16k;
179 float *synth = ctx->synth_buf + LP_FILTER_ORDER_16k;
180 float lsf_new[LP_FILTER_ORDER_16k];
181 double lsp_new[LP_FILTER_ORDER_16k];
182 float Az[2][LP_FILTER_ORDER_16k];
183 float fixed_vector[L_SUBFR_16k];
184 float pitch_fac, gain_code;
189 float *excitation = ctx->excitation + 292;
191 lsf_decode_fp_16k(ctx->lsf_history, lsf_new, params->vq_indexes,
192 params->ma_pred_switch);
194 ff_set_min_dist_lsf(lsf_new, LSFQ_DIFF_MIN / 2, LP_FILTER_ORDER_16k);
196 lsf2lsp(lsf_new, lsp_new);
198 acelp_lp_decodef(Az[0], Az[1], lsp_new, ctx->lsp_history_16k);
200 memcpy(ctx->lsp_history_16k, lsp_new, LP_FILTER_ORDER_16k * sizeof(double));
202 memcpy(synth - LP_FILTER_ORDER_16k, ctx->synth,
203 LP_FILTER_ORDER_16k * sizeof(*synth));
205 for (i = 0; i < SUBFRAME_COUNT_16k; i++) {
206 int i_subfr = i * L_SUBFR_16k;
208 float gain_corr_factor;
210 int pitch_delay_frac;
213 pitch_delay_3x = dec_delay3_1st(params->pitch_delay[i]);
215 pitch_delay_3x = dec_delay3_2nd(params->pitch_delay[i],
216 PITCH_MIN, PITCH_MAX,
217 ctx->pitch_lag_prev);
219 pitch_fac = gain_pitch_cb_16k[params->gp_index[i]];
220 f.pitch_fac = FFMIN(pitch_fac, 1.0);
221 f.pitch_lag = DIVIDE_BY_3(pitch_delay_3x+1);
222 ctx->pitch_lag_prev = f.pitch_lag;
224 pitch_delay_int = DIVIDE_BY_3(pitch_delay_3x + 2);
225 pitch_delay_frac = pitch_delay_3x + 2 - 3*pitch_delay_int;
227 ff_acelp_interpolatef(&excitation[i_subfr],
228 &excitation[i_subfr] - pitch_delay_int + 1,
229 sinc_win, 3, pitch_delay_frac + 1,
230 LP_FILTER_ORDER, L_SUBFR_16k);
233 memset(fixed_vector, 0, sizeof(fixed_vector));
235 ff_decode_10_pulses_35bits(params->fc_indexes[i], &f,
236 ff_fc_4pulses_8bits_tracks_13, 5, 4);
238 ff_set_fixed_vector(fixed_vector, &f, 1.0, L_SUBFR_16k);
240 gain_corr_factor = gain_cb_16k[params->gc_index[i]];
241 gain_code = gain_corr_factor *
242 acelp_decode_gain_codef(sqrt(L_SUBFR_16k), fixed_vector,
243 19.0 - 15.0/(0.05*M_LN10/M_LN2),
244 pred_16k, ctx->energy_history,
247 ctx->energy_history[1] = ctx->energy_history[0];
248 ctx->energy_history[0] = 20.0 * log10f(gain_corr_factor);
250 ff_weighted_vector_sumf(&excitation[i_subfr], &excitation[i_subfr],
251 fixed_vector, pitch_fac,
252 gain_code, L_SUBFR_16k);
254 ff_celp_lp_synthesis_filterf(synth + i_subfr, Az[i],
255 &excitation[i_subfr], L_SUBFR_16k,
256 LP_FILTER_ORDER_16k);
259 memcpy(ctx->synth, synth + frame_size - LP_FILTER_ORDER_16k,
260 LP_FILTER_ORDER_16k * sizeof(*synth));
262 memmove(ctx->excitation, ctx->excitation + 2 * L_SUBFR_16k,
263 (L_INTERPOL+PITCH_MAX) * sizeof(float));
265 postfilter(out_data, synth, ctx->iir_mem, ctx->filt_mem, ctx->mem_preemph);
267 memcpy(ctx->iir_mem, Az[1], LP_FILTER_ORDER_16k * sizeof(float));
270 void ff_sipr_init_16k(SiprContext *ctx)
274 for (i = 0; i < LP_FILTER_ORDER_16k; i++)
275 ctx->lsp_history_16k[i] = cos((i + 1) * M_PI/(LP_FILTER_ORDER_16k + 1));
277 ctx->filt_mem[0] = ctx->filt_buf[0];
278 ctx->filt_mem[1] = ctx->filt_buf[1];
280 ctx->pitch_lag_prev = 180;