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/mathematics.h" 28#include "lsp.h" 29#include "celp_math.h" 30#include "acelp_vectors.h" 31#include "acelp_pitch_delay.h" 32#include "acelp_filters.h" 33#include "celp_filters.h" 34 35#include "sipr16kdata.h" 36 37/** 38 * Convert an lsf vector into an lsp vector. 39 * 40 * @param lsf input lsf vector 41 * @param lsp output lsp vector 42 */ 43static void lsf2lsp(const float *lsf, double *lsp) 44{ 45 int i; 46 47 for (i = 0; i < LP_FILTER_ORDER_16k; i++) 48 lsp[i] = cosf(lsf[i]); 49} 50 51static void dequant(float *out, const int *idx, const float *cbs[]) 52{ 53 int i; 54 55 for (i = 0; i < 4; i++) 56 memcpy(out + 3*i, cbs[i] + 3*idx[i], 3*sizeof(float)); 57 58 memcpy(out + 12, cbs[4] + 4*idx[4], 4*sizeof(float)); 59} 60 61static void lsf_decode_fp_16k(float* lsf_history, float* isp_new, 62 const int* parm, int ma_pred) 63{ 64 int i; 65 float isp_q[LP_FILTER_ORDER_16k]; 66 67 dequant(isp_q, parm, lsf_codebooks_16k); 68 69 for (i = 0; i < LP_FILTER_ORDER_16k; i++) { 70 isp_new[i] = (1 - qu[ma_pred]) * isp_q[i] 71 + qu[ma_pred] * lsf_history[i] 72 + mean_lsf_16k[i]; 73 } 74 75 memcpy(lsf_history, isp_q, LP_FILTER_ORDER_16k * sizeof(float)); 76} 77 78static int dec_delay3_1st(int index) 79{ 80 if (index < 390) { 81 return index + 88; 82 } else 83 return 3 * index - 690; 84} 85 86static int dec_delay3_2nd(int index, int pit_min, int pit_max, 87 int pitch_lag_prev) 88{ 89 if (index < 62) { 90 int pitch_delay_min = av_clip(pitch_lag_prev - 10, 91 pit_min, pit_max - 19); 92 return 3 * pitch_delay_min + index - 2; 93 } else 94 return 3 * pitch_lag_prev; 95} 96 97static void postfilter(float *out_data, float* synth, float* iir_mem, 98 float* filt_mem[2], float* mem_preemph) 99{ 100 float buf[30 + LP_FILTER_ORDER_16k]; 101 float *tmpbuf = buf + LP_FILTER_ORDER_16k; 102 float s; 103 int i; 104 105 for (i = 0; i < LP_FILTER_ORDER_16k; i++) 106 filt_mem[0][i] = iir_mem[i] * ff_pow_0_5[i]; 107 108 memcpy(tmpbuf - LP_FILTER_ORDER_16k, mem_preemph, 109 LP_FILTER_ORDER_16k*sizeof(*buf)); 110 111 ff_celp_lp_synthesis_filterf(tmpbuf, filt_mem[1], synth, 30, 112 LP_FILTER_ORDER_16k); 113 114 memcpy(synth - LP_FILTER_ORDER_16k, mem_preemph, 115 LP_FILTER_ORDER_16k * sizeof(*synth)); 116 117 ff_celp_lp_synthesis_filterf(synth, filt_mem[0], synth, 30, 118 LP_FILTER_ORDER_16k); 119 120 memcpy(out_data + 30 - LP_FILTER_ORDER_16k, 121 synth + 30 - LP_FILTER_ORDER_16k, 122 LP_FILTER_ORDER_16k * sizeof(*synth)); 123 124 ff_celp_lp_synthesis_filterf(out_data + 30, filt_mem[0], 125 synth + 30, 2 * L_SUBFR_16k - 30, 126 LP_FILTER_ORDER_16k); 127 128 129 memcpy(mem_preemph, out_data + 2*L_SUBFR_16k - LP_FILTER_ORDER_16k, 130 LP_FILTER_ORDER_16k * sizeof(*synth)); 131 132 FFSWAP(float *, filt_mem[0], filt_mem[1]); 133 for (i = 0, s = 0; i < 30; i++, s += 1.0/30) 134 out_data[i] = tmpbuf[i] + s * (synth[i] - tmpbuf[i]); 135} 136 137/** 138 * Floating point version of ff_acelp_lp_decode(). 139 */ 140static void acelp_lp_decodef(float *lp_1st, float *lp_2nd, 141 const double *lsp_2nd, const double *lsp_prev) 142{ 143 double lsp_1st[LP_FILTER_ORDER_16k]; 144 int i; 145 146 /* LSP values for first subframe (3.2.5 of G.729, Equation 24) */ 147 for (i = 0; i < LP_FILTER_ORDER_16k; i++) 148 lsp_1st[i] = (lsp_2nd[i] + lsp_prev[i]) * 0.5; 149 150 ff_acelp_lspd2lpc(lsp_1st, lp_1st, LP_FILTER_ORDER_16k >> 1); 151 152 /* LSP values for second subframe (3.2.5 of G.729) */ 153 ff_acelp_lspd2lpc(lsp_2nd, lp_2nd, LP_FILTER_ORDER_16k >> 1); 154} 155 156/** 157 * Floating point version of ff_acelp_decode_gain_code(). 158 */ 159static float acelp_decode_gain_codef(float gain_corr_factor, const float *fc_v, 160 float mr_energy, const float *quant_energy, 161 const float *ma_prediction_coeff, 162 int subframe_size, int ma_pred_order) 163{ 164 mr_energy += 165 ff_dot_productf(quant_energy, ma_prediction_coeff, ma_pred_order); 166 167 mr_energy = gain_corr_factor * exp(M_LN10 / 20. * mr_energy) / 168 sqrt((0.01 + ff_dot_productf(fc_v, fc_v, subframe_size))); 169 return mr_energy; 170} 171 172#define DIVIDE_BY_3(x) ((x) * 10923 >> 15) 173 174void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params, 175 float *out_data) 176{ 177 int frame_size = SUBFRAME_COUNT_16k * L_SUBFR_16k; 178 float *synth = ctx->synth_buf + LP_FILTER_ORDER_16k; 179 float lsf_new[LP_FILTER_ORDER_16k]; 180 double lsp_new[LP_FILTER_ORDER_16k]; 181 float Az[2][LP_FILTER_ORDER_16k]; 182 float fixed_vector[L_SUBFR_16k]; 183 float pitch_fac, gain_code; 184 185 int i; 186 int pitch_delay_3x; 187 188 float *excitation = ctx->excitation + 292; 189 190 lsf_decode_fp_16k(ctx->lsf_history, lsf_new, params->vq_indexes, 191 params->ma_pred_switch); 192 193 ff_set_min_dist_lsf(lsf_new, LSFQ_DIFF_MIN / 2, LP_FILTER_ORDER_16k); 194 195 lsf2lsp(lsf_new, lsp_new); 196 197 acelp_lp_decodef(Az[0], Az[1], lsp_new, ctx->lsp_history_16k); 198 199 memcpy(ctx->lsp_history_16k, lsp_new, LP_FILTER_ORDER_16k * sizeof(double)); 200 201 memcpy(synth - LP_FILTER_ORDER_16k, ctx->synth, 202 LP_FILTER_ORDER_16k * sizeof(*synth)); 203 204 for (i = 0; i < SUBFRAME_COUNT_16k; i++) { 205 int i_subfr = i * L_SUBFR_16k; 206 AMRFixed f; 207 float gain_corr_factor; 208 int pitch_delay_int; 209 int pitch_delay_frac; 210 211 if (!i) { 212 pitch_delay_3x = dec_delay3_1st(params->pitch_delay[i]); 213 } else 214 pitch_delay_3x = dec_delay3_2nd(params->pitch_delay[i], 215 PITCH_MIN, PITCH_MAX, 216 ctx->pitch_lag_prev); 217 218 pitch_fac = gain_pitch_cb_16k[params->gp_index[i]]; 219 f.pitch_fac = FFMIN(pitch_fac, 1.0); 220 f.pitch_lag = DIVIDE_BY_3(pitch_delay_3x+1); 221 ctx->pitch_lag_prev = f.pitch_lag; 222 223 pitch_delay_int = DIVIDE_BY_3(pitch_delay_3x + 2); 224 pitch_delay_frac = pitch_delay_3x + 2 - 3*pitch_delay_int; 225 226 ff_acelp_interpolatef(&excitation[i_subfr], 227 &excitation[i_subfr] - pitch_delay_int + 1, 228 sinc_win, 3, pitch_delay_frac + 1, 229 LP_FILTER_ORDER, L_SUBFR_16k); 230 231 232 memset(fixed_vector, 0, sizeof(fixed_vector)); 233 234 ff_decode_10_pulses_35bits(params->fc_indexes[i], &f, 235 ff_fc_4pulses_8bits_tracks_13, 5, 4); 236 237 ff_set_fixed_vector(fixed_vector, &f, 1.0, L_SUBFR_16k); 238 239 gain_corr_factor = gain_cb_16k[params->gc_index[i]]; 240 gain_code = gain_corr_factor * 241 acelp_decode_gain_codef(sqrt(L_SUBFR_16k), fixed_vector, 242 19.0 - 15.0/(0.05*M_LN10/M_LN2), 243 pred_16k, ctx->energy_history, 244 L_SUBFR_16k, 2); 245 246 ctx->energy_history[1] = ctx->energy_history[0]; 247 ctx->energy_history[0] = 20.0 * log10f(gain_corr_factor); 248 249 ff_weighted_vector_sumf(&excitation[i_subfr], &excitation[i_subfr], 250 fixed_vector, pitch_fac, 251 gain_code, L_SUBFR_16k); 252 253 ff_celp_lp_synthesis_filterf(synth + i_subfr, Az[i], 254 &excitation[i_subfr], L_SUBFR_16k, 255 LP_FILTER_ORDER_16k); 256 257 } 258 memcpy(ctx->synth, synth + frame_size - LP_FILTER_ORDER_16k, 259 LP_FILTER_ORDER_16k * sizeof(*synth)); 260 261 memmove(ctx->excitation, ctx->excitation + 2 * L_SUBFR_16k, 262 (L_INTERPOL+PITCH_MAX) * sizeof(float)); 263 264 postfilter(out_data, synth, ctx->iir_mem, ctx->filt_mem, ctx->mem_preemph); 265 266 memcpy(ctx->iir_mem, Az[1], LP_FILTER_ORDER_16k * sizeof(float)); 267} 268 269void ff_sipr_init_16k(SiprContext *ctx) 270{ 271 int i; 272 273 for (i = 0; i < LP_FILTER_ORDER_16k; i++) 274 ctx->lsp_history_16k[i] = cos((i + 1) * M_PI/(LP_FILTER_ORDER_16k + 1)); 275 276 ctx->filt_mem[0] = ctx->filt_buf[0]; 277 ctx->filt_mem[1] = ctx->filt_buf[1]; 278 279 ctx->pitch_lag_prev = 180; 280} 281