| 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 | } |