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69 lines
1.9 KiB
C++
69 lines
1.9 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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/* -*- c++ -*- */
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#ifndef INCLUDED_IMBE_VOCODER_H
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#define INCLUDED_IMBE_VOCODER_H
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#include <cstdint>
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#define FRAME 160 // Number samples in frame
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#define NUM_HARMS_MAX 56 // Maximum number of harmonics
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#define NUM_HARMS_MIN 9 // Minimum number of harmonics
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#define NUM_BANDS_MAX 12 // Maximum number of bands
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#define MAX_BLOCK_LEN 10 // Maximum length of block used during spectral amplitude encoding
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#define NUM_PRED_RES_BLKS 6 // Number of Prediction Residual Blocks
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#define PE_LPF_ORD 21 // Order of Pitch estimation LPF
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#define PITCH_EST_FRAME 301 // Pitch estimation frame size
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#define B_NUM (NUM_HARMS_MAX - 1)
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typedef struct
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{
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short e_p;
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short pitch; // Q14.2
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short ref_pitch; // Q8.8
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int fund_freq;
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short num_harms;
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short num_bands;
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short v_uv_dsn[NUM_HARMS_MAX];
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short b_vec[NUM_HARMS_MAX + 3];
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short bit_alloc[B_NUM + 4];
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short sa[NUM_HARMS_MAX];
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short l_uv;
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short div_one_by_num_harm;
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short div_one_by_num_harm_sh;
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} IMBE_PARAM;
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typedef struct
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{
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short re;
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short im;
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} Cmplx16;
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class imbe_vocoder_impl;
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class imbe_vocoder
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{
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public:
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imbe_vocoder(void); // constructor
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~imbe_vocoder(); // destructor
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// imbe_encode compresses 160 samples (in unsigned int format)
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// outputs u[] vectors as frame_vector[]
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void imbe_encode(int16_t *frame_vector, int16_t *snd);
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// imbe_decode decodes IMBE codewords (frame_vector),
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// outputs the resulting 160 audio samples (snd)
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void imbe_decode(int16_t *frame_vector, int16_t *snd);
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void encode_4400(int16_t *snd, uint8_t *imbe);
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void decode_4400(int16_t *snd, uint8_t *imbe);
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const IMBE_PARAM* param(void);
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private:
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imbe_vocoder_impl *Impl;
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};
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#endif /* INCLUDED_IMBE_VOCODER_H */
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