98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
/*
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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 "globals.h"
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#include "imbe.h"
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#include "basic_op.h"
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#include "dsp_sub.h"
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#include "aux_sub.h"
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#include "tbls.h"
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#include "encode.h"
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#include "dc_rmv.h"
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#include "pe_lpf.h"
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#include "pitch_est.h"
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#include "pitch_ref.h"
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#include "v_uv_det.h"
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#include "sa_encode.h"
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#include "ch_encode.h"
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#include "imbe_vocoder.h"
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void imbe_vocoder::encode_init(void)
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{
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v_zap(pitch_est_buf, PITCH_EST_BUF_SIZE);
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v_zap(pitch_ref_buf, PITCH_EST_BUF_SIZE);
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v_zap(pe_lpf_mem, PE_LPF_ORD);
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pitch_est_init();
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fft_init();
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dc_rmv_mem = 0;
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}
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void imbe_vocoder::encode(IMBE_PARAM *imbe_param, Word16 *frame_vector, Word16 *snd)
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{
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Word16 i;
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Word16 *wr_ptr, *sig_ptr;
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for(i = 0; i < PITCH_EST_BUF_SIZE - FRAME; i++)
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{
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pitch_est_buf[i] = pitch_est_buf[i + FRAME];
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pitch_ref_buf[i] = pitch_ref_buf[i + FRAME];
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}
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dc_rmv(snd, &pitch_ref_buf[PITCH_EST_BUF_SIZE - FRAME], &dc_rmv_mem, FRAME);
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pe_lpf(&pitch_ref_buf[PITCH_EST_BUF_SIZE - FRAME], &pitch_est_buf[PITCH_EST_BUF_SIZE - FRAME], pe_lpf_mem, FRAME);
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pitch_est(imbe_param, pitch_est_buf);
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//
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// Speech windowing and FFT calculation
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//
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wr_ptr = (Word16 *)wr;
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sig_ptr = &pitch_ref_buf[40];
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for(i = 146; i < 256; i++)
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{
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fft_buf[i].re = mult(*sig_ptr++, *wr_ptr++);
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fft_buf[i].im = 0;
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}
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fft_buf[0].re = *sig_ptr++;
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fft_buf[0].im = 0;
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wr_ptr--;
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for(i = 1; i < 111; i++)
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{
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fft_buf[i].re = mult(*sig_ptr++, *wr_ptr--);
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fft_buf[i].im = 0;
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}
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for(i = 111; i < 146; i++)
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fft_buf[i].re = fft_buf[i].im = 0;
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fft((Word16 *)&fft_buf, FFTLENGTH, 1);
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pitch_ref(imbe_param, fft_buf);
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v_uv_det(imbe_param, fft_buf);
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sa_encode(imbe_param);
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encode_frame_vector(imbe_param, frame_vector);
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}
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