105 lines
2.9 KiB
C++
105 lines
2.9 KiB
C++
/* -*- C++ -*- */
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/*
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* Copyright 2008-2009 Steve Glass
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*
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* This file is part of OP25.
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*
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* OP25 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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* OP25 is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* 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 OP25; 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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#ifndef INCLUDED_SOFTWARE_IMBE_DECODER_H
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#define INCLUDED_SOFTWARE_IMBE_DECODER_H
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#include "imbe_decoder.h"
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#include <stdint.h>
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/**
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* A software implementation of the imbe_decoder interface.
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*/
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class software_imbe_decoder : public imbe_decoder {
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public:
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/**
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* Default constructor for the software_imbe_decoder.
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*/
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software_imbe_decoder();
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/**
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* Destructor for the software_imbe_decoder.
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*/
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virtual ~software_imbe_decoder();
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/**
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* Decode the compressed audio.
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*
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* cw in IMBE codeword (including parity check bits).
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*/
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virtual void decode(const voice_codeword& cw);
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void decode_tap(int _L, int _K, float _w0, const int * _v, const float * _mu);
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private:
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//NOTE: Single-letter variable names are upper case only; Lower
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// case if needed is spelled. e.g. L, ell
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// global Seq ER ?
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int bee[58]; //Encoded Spectral Amplitudes
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float M[57][2]; //Enhanced Spectral Amplitudes
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float Mu[57][2]; //Unenhanced Spectral Amplitudes
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int vee[57][2]; //V/UV decisions
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float suv[160]; //Unvoiced samples
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float sv[160]; //Voiced samples
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float log2Mu[58][2];
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float Olduw[256];
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float psi1;
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float phi[57][2];
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uint32_t u[211];
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int Old;
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int New;
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int L;
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int OldL;
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float w0;
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float Oldw0;
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float Luv; //number of unvoiced spectral amplitudes
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char sym_b[4096];
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char RxData[4096];
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int sym_bp;
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int ErFlag;
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uint32_t pngen15(uint32_t& pn);
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uint32_t pngen23(uint32_t& pn);
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uint32_t next_u(uint32_t u);
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void decode_audio(uint8_t *);
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void decode_spectral_amplitudes(int, int );
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void decode_vuv(int );
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void adaptive_smoothing(float, float, float );
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void fft(float i[], float q[]);
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void enhance_spectral_amplitudes(float&);
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void ifft(float i[], float q[], float[]);
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uint16_t rearrange(uint32_t u0, uint32_t u1, uint32_t u2, uint32_t u3, uint32_t u4, uint32_t u5, uint32_t u6, uint32_t u7);
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void synth_unvoiced();
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void synth_voiced();
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void unpack(uint8_t *buf, uint32_t& u0, uint32_t& u1, uint32_t& u2, uint32_t& u3, uint32_t& u4, uint32_t& u5, uint32_t& u6, uint32_t& u7, uint32_t& E0, uint32_t& ET);
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};
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#endif /* INCLUDED_SOFTWARE_IMBE_DECODER_H */
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