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249 lines
6.4 KiB
C++
249 lines
6.4 KiB
C++
1 year ago
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/*
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* Project 25 IMBE Encoder/Decoder Fixed-Point implementation
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* Developed by Pavel Yazev E-mail: pyazev@gmail.com
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* Version 1.0 (c) Copyright 2009
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* The software is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Boston, MA
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* 02110-1301, USA.
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*/
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#include "typedef.h"
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#include "basic_op.h"
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#include "imbe.h"
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#include "aux_sub.h"
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#include "dsp_sub.h"
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#include "math_sub.h"
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#include "v_synt.h"
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#include "rand_gen.h"
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#include "tbls.h"
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#include "encode.h"
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#include "imbe_vocoder_impl.h"
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#define CNST_0_1_Q1_15 0x0CCD
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void imbe_vocoder_impl::v_synt_init(void)
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{
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Word16 i;
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for(i = 0; i < NUM_HARMS_MAX; i++)
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{
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ph_mem[i] = L_deposit_h(rand_gen());
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vu_dsn_prev[i] = 0;
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}
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num_harms_prev3 = 0;
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fund_freq_prev = 0;
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}
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void imbe_vocoder_impl::v_synt(IMBE_PARAM *imbe_param, Word16 *snd)
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{
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Word32 L_tmp, L_tmp1, fund_freq, L_snd[FRAME], L_ph_acc, L_ph_step;
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Word32 L_ph_acc_aux, L_ph_step_prev, L_amp_acc, L_amp_step, L_ph_step_aux;
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Word16 num_harms, i, j, *vu_dsn, *sa, *s_ptr, *s_ptr_aux, num_harms_max, num_harms_max_4;
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UWord32 ph_mem_prev[NUM_HARMS_MAX], dph[NUM_HARMS_MAX];
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Word16 num_harms_inv, num_harms_sh, num_uv;
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Word16 freq_flag;
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fund_freq = imbe_param->fund_freq;
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num_harms = imbe_param->num_harms;
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vu_dsn = imbe_param->v_uv_dsn;
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sa = imbe_param->sa;
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num_harms_inv = imbe_param->div_one_by_num_harm;
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num_harms_sh = imbe_param->div_one_by_num_harm_sh;
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num_uv = imbe_param->l_uv;
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for(i = 0; i < FRAME; i++)
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L_snd[i] = 0;
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// Update phases (calculated phase value correspond to bound of frame)
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L_tmp = (((fund_freq_prev + fund_freq) >> 7) * FRAME/2) << 7; // It is performed integer multiplication by mod 1
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L_ph_acc = 0;
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for(i = 0; i < NUM_HARMS_MAX; i++)
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{
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ph_mem_prev[i] = ph_mem[i];
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L_ph_acc += L_tmp;
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ph_mem[i] += L_ph_acc;
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dph[i] = 0;
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}
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num_harms_max = (num_harms >= num_harms_prev3)?num_harms:num_harms_prev3;
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num_harms_max_4 = num_harms_max >> 2;
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if(L_abs(L_sub(fund_freq, fund_freq_prev)) >= L_mpy_ls(fund_freq, CNST_0_1_Q1_15))
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freq_flag = 1;
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else
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freq_flag = 0;
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L_ph_step = L_ph_step_prev = 0;
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for(i = 0; i < num_harms_max; i++)
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{
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L_ph_step += fund_freq;
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L_ph_step_prev += fund_freq_prev;
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if(i > num_harms_max_4)
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{
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if(num_uv == num_harms)
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{
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dph[i] = L_deposit_h(rand_gen());
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}
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else
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{
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L_tmp = L_mult(rand_gen(), num_harms_inv);
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dph[i] = L_shr(L_tmp, 15 - num_harms_sh) * num_uv;
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}
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ph_mem[i] += dph[i];
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}
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if(vu_dsn[i] == 0 && vu_dsn_prev[i] == 0)
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continue;
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if(vu_dsn[i] == 1 && vu_dsn_prev[i] == 0) // unvoiced => voiced
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{
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s_ptr = (Word16 *)ws;
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L_ph_acc = ph_mem[i] - (((L_ph_step >> 7) * 104) << 7);
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for(j = 56; j <= 104; j++)
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{
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L_tmp = L_mult(*s_ptr++, sa[i]);
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L_tmp = L_mpy_ls(L_tmp, cos_fxp(extract_h(L_ph_acc)));
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L_tmp = L_shr(L_tmp, 1);
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L_snd[j] = L_add(L_snd[j], L_tmp);
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L_ph_acc += L_ph_step;
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}
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for(j = 105; j <= 159; j++)
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{
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L_tmp = L_mult(sa[i], cos_fxp(extract_h(L_ph_acc)));
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L_tmp = L_shr(L_tmp, 1);
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L_snd[j] = L_add(L_snd[j], L_tmp);
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L_ph_acc += L_ph_step;
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}
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continue;
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}
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if(vu_dsn[i] == 0 && vu_dsn_prev[i] == 1) // voiced => unvoiced
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{
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s_ptr = (Word16 *)&ws[48];
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L_ph_acc = ph_mem_prev[i];
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for(j = 0; j <= 55; j++)
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{
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L_tmp = L_mult(sa_prev3[i], cos_fxp(extract_h(L_ph_acc)));
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L_tmp = L_shr(L_tmp, 1);
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L_snd[j] = L_add(L_snd[j], L_tmp);
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L_ph_acc += L_ph_step_prev;
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}
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for(j = 56; j <= 104; j++)
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{
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L_tmp = L_mult(*s_ptr--, sa_prev3[i]);
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L_tmp = L_mpy_ls(L_tmp, cos_fxp(extract_h(L_ph_acc)));
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L_tmp = L_shr(L_tmp, 1);
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L_snd[j] = L_add(L_snd[j], L_tmp);
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L_ph_acc += L_ph_step_prev;
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}
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continue;
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}
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if(i >=7 || freq_flag)
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{
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s_ptr_aux = (Word16 *)&ws[48];
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L_ph_acc_aux = ph_mem_prev[i];
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s_ptr = (Word16 *)ws;
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L_ph_acc = ph_mem[i] - (((L_ph_step >> 7) * 104) << 7);
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for(j = 0; j <= 55; j++)
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{
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L_tmp = L_mult(sa_prev3[i], cos_fxp(extract_h(L_ph_acc_aux)));
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L_tmp = L_shr(L_tmp, 1);
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L_snd[j] = L_add(L_snd[j], L_tmp);
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L_ph_acc_aux += L_ph_step_prev;
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}
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for(j = 56; j <= 104; j++)
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{
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L_tmp = L_mult(*s_ptr_aux--, sa_prev3[i]);
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L_tmp = L_mpy_ls(L_tmp, cos_fxp(extract_h(L_ph_acc_aux)));
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L_tmp = L_shr(L_tmp, 1);
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L_snd[j] = L_add(L_snd[j], L_tmp);
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L_tmp = L_mult(*s_ptr++, sa[i]);
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L_tmp = L_mpy_ls(L_tmp, cos_fxp(extract_h(L_ph_acc)));
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L_tmp = L_shr(L_tmp, 1);
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L_snd[j] = L_add(L_snd[j], L_tmp);
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L_ph_acc_aux += L_ph_step_prev;
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L_ph_acc += L_ph_step;
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}
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for(j = 105; j <= 159; j++)
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{
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L_tmp = L_mult(sa[i], cos_fxp(extract_h(L_ph_acc)));
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L_tmp = L_shr(L_tmp, 1);
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L_snd[j] = L_add(L_snd[j], L_tmp);
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L_ph_acc += L_ph_step;
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}
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continue;
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}
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L_amp_step = L_mpy_ls(L_shr(L_deposit_h(sub(sa[i], sa_prev3[i])), 4 + 1), CNST_0_1_Q1_15); // (sa[i] - sa_prev3[i]) / 160, 1/160 = 0.1/16
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L_amp_acc = L_shr(L_deposit_h(sa_prev3[i]), 1);
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L_ph_step_aux = L_mpy_ls(L_shr(fund_freq - fund_freq_prev, 4 + 1), CNST_0_1_Q1_15); // (fund_freq - fund_freq_prev)/(2*160)
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L_ph_step_aux = ((L_ph_step_aux >> 7) * (i + 1)) << 7;
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L_ph_acc = ph_mem_prev[i];
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L_tmp1 = L_mpy_ls(L_shr(dph[i], 4), CNST_0_1_Q1_15); // dph[i] / 160
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for(j = 0; j < 160; j++)
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{
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L_ph_acc_aux = ((L_ph_step_aux >> 9) * j) << 9;
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L_ph_acc_aux = ((L_ph_acc_aux >> 9) * j) << 9;
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L_tmp = L_mpy_ls(L_amp_acc, cos_fxp(extract_h(L_ph_acc + L_ph_acc_aux)));
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L_snd[j] = L_add(L_snd[j], L_tmp);
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L_amp_acc = L_add(L_amp_acc, L_amp_step);
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L_ph_acc += L_ph_step_prev;
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L_ph_acc += L_tmp1;
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}
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}
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for(i = 0; i < FRAME; i++)
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*snd++ = extract_h(L_snd[i]);
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v_zap(vu_dsn_prev, NUM_HARMS_MAX);
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v_equ(vu_dsn_prev, imbe_param->v_uv_dsn, num_harms);
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v_equ(sa_prev3, imbe_param->sa, num_harms);
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num_harms_prev3 = num_harms;
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fund_freq_prev = fund_freq;
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}
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