MMDVM_CM/USRP2DMR/imbe_vocoder.h

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2021-04-10 16:13:33 -04:00
/*
* * Project 25 IMBE Encoder/Decoder Fixed-Point implementation
* * Developed by Pavel Yazev E-mail: pyazev@gmail.com
* * Version 1.0 (c) Copyright 2009
* */
/* -*- c++ -*- */
#ifndef INCLUDED_IMBE_VOCODER_H
#define INCLUDED_IMBE_VOCODER_H
#include <cstdint>
#include "typedefs.h"
#define FRAME 160 // Number samples in frame
#define NUM_HARMS_MAX 56 // Maximum number of harmonics
#define NUM_HARMS_MIN 9 // Minimum number of harmonics
#define NUM_BANDS_MAX 12 // Maximum number of bands
#define MAX_BLOCK_LEN 10 // Maximum length of block used during spectral amplitude encoding
#define NUM_PRED_RES_BLKS 6 // Number of Prediction Residual Blocks
#define PE_LPF_ORD 21 // Order of Pitch estimation LPF
#define PITCH_EST_FRAME 301 // Pitch estimation frame size
#define B_NUM (NUM_HARMS_MAX - 1)
typedef struct
{
Word16 e_p;
Word16 pitch; // Q14.2
Word16 ref_pitch; // Q8.8
Word32 fund_freq;
Word16 num_harms;
Word16 num_bands;
Word16 v_uv_dsn[NUM_HARMS_MAX];
Word16 b_vec[NUM_HARMS_MAX + 3];
Word16 bit_alloc[B_NUM + 4];
Word16 sa[NUM_HARMS_MAX];
Word16 l_uv;
Word16 div_one_by_num_harm;
Word16 div_one_by_num_harm_sh;
} IMBE_PARAM;
typedef struct
{
Word16 re;
Word16 im;
} Cmplx16;
class imbe_vocoder_impl;
class imbe_vocoder
{
public:
imbe_vocoder(void); // constructor
~imbe_vocoder(); // destructor
// imbe_encode compresses 160 samples (in unsigned int format)
// outputs u[] vectors as frame_vector[]
void imbe_encode(int16_t *frame_vector, int16_t *snd);
// imbe_decode decodes IMBE codewords (frame_vector),
// outputs the resulting 160 audio samples (snd)
void imbe_decode(int16_t *frame_vector, int16_t *snd);
const IMBE_PARAM* param(void);
private:
imbe_vocoder_impl *Impl;
};
#endif /* INCLUDED_IMBE_VOCODER_H */