/* * SIPR decoder for the 16k mode * * Copyright (c) 2008 Vladimir Voroshilov * Copyright (c) 2009 Vitor Sessak * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <math.h> #include "sipr.h" #include "libavutil/mathematics.h" #include "lsp.h" #include "celp_math.h" #include "acelp_vectors.h" #include "acelp_pitch_delay.h" #include "acelp_filters.h" #include "celp_filters.h" #include "sipr16kdata.h" /** * Convert an lsf vector into an lsp vector. * * @param lsf input lsf vector * @param lsp output lsp vector */ static void lsf2lsp(const float *lsf, double *lsp) { int i; for (i = 0; i < LP_FILTER_ORDER_16k; i++) lsp[i] = cosf(lsf[i]); } static void dequant(float *out, const int *idx, const float *cbs[]) { int i; for (i = 0; i < 4; i++) memcpy(out + 3*i, cbs[i] + 3*idx[i], 3*sizeof(float)); memcpy(out + 12, cbs[4] + 4*idx[4], 4*sizeof(float)); } static void lsf_decode_fp_16k(float* lsf_history, float* isp_new, const int* parm, int ma_pred) { int i; float isp_q[LP_FILTER_ORDER_16k]; dequant(isp_q, parm, lsf_codebooks_16k); for (i = 0; i < LP_FILTER_ORDER_16k; i++) { isp_new[i] = (1 - qu[ma_pred]) * isp_q[i] + qu[ma_pred] * lsf_history[i] + mean_lsf_16k[i]; } memcpy(lsf_history, isp_q, LP_FILTER_ORDER_16k * sizeof(float)); } static int dec_delay3_1st(int index) { if (index < 390) { return index + 88; } else return 3 * index - 690; } static int dec_delay3_2nd(int index, int pit_min, int pit_max, int pitch_lag_prev) { if (index < 62) { int pitch_delay_min = av_clip(pitch_lag_prev - 10, pit_min, pit_max - 19); return 3 * pitch_delay_min + index - 2; } else return 3 * pitch_lag_prev; } static void postfilter(float *out_data, float* synth, float* iir_mem, float* filt_mem[2], float* mem_preemph) { float buf[30 + LP_FILTER_ORDER_16k]; float *tmpbuf = buf + LP_FILTER_ORDER_16k; float s; int i; for (i = 0; i < LP_FILTER_ORDER_16k; i++) filt_mem[0][i] = iir_mem[i] * ff_pow_0_5[i]; memcpy(tmpbuf - LP_FILTER_ORDER_16k, mem_preemph, LP_FILTER_ORDER_16k*sizeof(*buf)); ff_celp_lp_synthesis_filterf(tmpbuf, filt_mem[1], synth, 30, LP_FILTER_ORDER_16k); memcpy(synth - LP_FILTER_ORDER_16k, mem_preemph, LP_FILTER_ORDER_16k * sizeof(*synth)); ff_celp_lp_synthesis_filterf(synth, filt_mem[0], synth, 30, LP_FILTER_ORDER_16k); memcpy(out_data + 30 - LP_FILTER_ORDER_16k, synth + 30 - LP_FILTER_ORDER_16k, LP_FILTER_ORDER_16k * sizeof(*synth)); ff_celp_lp_synthesis_filterf(out_data + 30, filt_mem[0], synth + 30, 2 * L_SUBFR_16k - 30, LP_FILTER_ORDER_16k); memcpy(mem_preemph, out_data + 2*L_SUBFR_16k - LP_FILTER_ORDER_16k, LP_FILTER_ORDER_16k * sizeof(*synth)); FFSWAP(float *, filt_mem[0], filt_mem[1]); for (i = 0, s = 0; i < 30; i++, s += 1.0/30) out_data[i] = tmpbuf[i] + s * (synth[i] - tmpbuf[i]); } /** * Floating point version of ff_acelp_lp_decode(). */ static void acelp_lp_decodef(float *lp_1st, float *lp_2nd, const double *lsp_2nd, const double *lsp_prev) { double lsp_1st[LP_FILTER_ORDER_16k]; int i; /* LSP values for first subframe (3.2.5 of G.729, Equation 24) */ for (i = 0; i < LP_FILTER_ORDER_16k; i++) lsp_1st[i] = (lsp_2nd[i] + lsp_prev[i]) * 0.5; ff_acelp_lspd2lpc(lsp_1st, lp_1st, LP_FILTER_ORDER_16k >> 1); /* LSP values for second subframe (3.2.5 of G.729) */ ff_acelp_lspd2lpc(lsp_2nd, lp_2nd, LP_FILTER_ORDER_16k >> 1); } /** * Floating point version of ff_acelp_decode_gain_code(). */ static float acelp_decode_gain_codef(float gain_corr_factor, const float *fc_v, float mr_energy, const float *quant_energy, const float *ma_prediction_coeff, int subframe_size, int ma_pred_order) { mr_energy += ff_dot_productf(quant_energy, ma_prediction_coeff, ma_pred_order); mr_energy = gain_corr_factor * exp(M_LN10 / 20. * mr_energy) / sqrt((0.01 + ff_dot_productf(fc_v, fc_v, subframe_size))); return mr_energy; } #define DIVIDE_BY_3(x) ((x) * 10923 >> 15) void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params, float *out_data) { int frame_size = SUBFRAME_COUNT_16k * L_SUBFR_16k; float *synth = ctx->synth_buf + LP_FILTER_ORDER_16k; float lsf_new[LP_FILTER_ORDER_16k]; double lsp_new[LP_FILTER_ORDER_16k]; float Az[2][LP_FILTER_ORDER_16k]; float fixed_vector[L_SUBFR_16k]; float pitch_fac, gain_code; int i; int pitch_delay_3x; float *excitation = ctx->excitation + 292; lsf_decode_fp_16k(ctx->lsf_history, lsf_new, params->vq_indexes, params->ma_pred_switch); ff_set_min_dist_lsf(lsf_new, LSFQ_DIFF_MIN / 2, LP_FILTER_ORDER_16k); lsf2lsp(lsf_new, lsp_new); acelp_lp_decodef(Az[0], Az[1], lsp_new, ctx->lsp_history_16k); memcpy(ctx->lsp_history_16k, lsp_new, LP_FILTER_ORDER_16k * sizeof(double)); memcpy(synth - LP_FILTER_ORDER_16k, ctx->synth, LP_FILTER_ORDER_16k * sizeof(*synth)); for (i = 0; i < SUBFRAME_COUNT_16k; i++) { int i_subfr = i * L_SUBFR_16k; AMRFixed f; float gain_corr_factor; int pitch_delay_int; int pitch_delay_frac; if (!i) { pitch_delay_3x = dec_delay3_1st(params->pitch_delay[i]); } else pitch_delay_3x = dec_delay3_2nd(params->pitch_delay[i], PITCH_MIN, PITCH_MAX, ctx->pitch_lag_prev); pitch_fac = gain_pitch_cb_16k[params->gp_index[i]]; f.pitch_fac = FFMIN(pitch_fac, 1.0); f.pitch_lag = DIVIDE_BY_3(pitch_delay_3x+1); ctx->pitch_lag_prev = f.pitch_lag; pitch_delay_int = DIVIDE_BY_3(pitch_delay_3x + 2); pitch_delay_frac = pitch_delay_3x + 2 - 3*pitch_delay_int; ff_acelp_interpolatef(&excitation[i_subfr], &excitation[i_subfr] - pitch_delay_int + 1, sinc_win, 3, pitch_delay_frac + 1, LP_FILTER_ORDER, L_SUBFR_16k); memset(fixed_vector, 0, sizeof(fixed_vector)); ff_decode_10_pulses_35bits(params->fc_indexes[i], &f, ff_fc_4pulses_8bits_tracks_13, 5, 4); ff_set_fixed_vector(fixed_vector, &f, 1.0, L_SUBFR_16k); gain_corr_factor = gain_cb_16k[params->gc_index[i]]; gain_code = gain_corr_factor * acelp_decode_gain_codef(sqrt(L_SUBFR_16k), fixed_vector, 19.0 - 15.0/(0.05*M_LN10/M_LN2), pred_16k, ctx->energy_history, L_SUBFR_16k, 2); ctx->energy_history[1] = ctx->energy_history[0]; ctx->energy_history[0] = 20.0 * log10f(gain_corr_factor); ff_weighted_vector_sumf(&excitation[i_subfr], &excitation[i_subfr], fixed_vector, pitch_fac, gain_code, L_SUBFR_16k); ff_celp_lp_synthesis_filterf(synth + i_subfr, Az[i], &excitation[i_subfr], L_SUBFR_16k, LP_FILTER_ORDER_16k); } memcpy(ctx->synth, synth + frame_size - LP_FILTER_ORDER_16k, LP_FILTER_ORDER_16k * sizeof(*synth)); memmove(ctx->excitation, ctx->excitation + 2 * L_SUBFR_16k, (L_INTERPOL+PITCH_MAX) * sizeof(float)); postfilter(out_data, synth, ctx->iir_mem, ctx->filt_mem, ctx->mem_preemph); memcpy(ctx->iir_mem, Az[1], LP_FILTER_ORDER_16k * sizeof(float)); } void ff_sipr_init_16k(SiprContext *ctx) { int i; for (i = 0; i < LP_FILTER_ORDER_16k; i++) ctx->lsp_history_16k[i] = cos((i + 1) * M_PI/(LP_FILTER_ORDER_16k + 1)); ctx->filt_mem[0] = ctx->filt_buf[0]; ctx->filt_mem[1] = ctx->filt_buf[1]; ctx->pitch_lag_prev = 180; }