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148 lines
4.2 KiB
148 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Digital Voice Modem - MBE Vocoder
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright (C) 2019-2021 Doug McLain
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* Copyright (C) 2021 Bryan Biedenkapp, N2PLL
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*
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*/
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/**
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* @file MBEDecoder.h
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* @ingroup vocoder
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* @file MBEDecoder.cpp
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* @ingroup vocoder
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*/
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#if !defined(__MBE_DECODER_H__)
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#define __MBE_DECODER_H__
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extern "C" {
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#include "mbe.h"
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}
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#include "Defines.h"
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#include <stdlib.h>
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#include <queue>
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namespace vocoder
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{
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// ---------------------------------------------------------------------------
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// Structure Declaration
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// ---------------------------------------------------------------------------
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struct mbelibParms
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{
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mbe_parms* m_cur_mp;
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mbe_parms* m_prev_mp;
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mbe_parms* m_prev_mp_enhanced;
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/// <summary></summary>
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mbelibParms()
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{
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m_cur_mp = (mbe_parms*)malloc(sizeof(mbe_parms));
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m_prev_mp = (mbe_parms*)malloc(sizeof(mbe_parms));
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m_prev_mp_enhanced = (mbe_parms*)malloc(sizeof(mbe_parms));
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}
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/// <summary></summary>
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~mbelibParms()
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{
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free(m_prev_mp_enhanced);
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free(m_prev_mp);
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free(m_cur_mp);
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}
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};
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// ---------------------------------------------------------------------------
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// Constants
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// ---------------------------------------------------------------------------
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/**
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* @brief Vocoder Decoding Mode
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*/
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enum MBE_DECODER_MODE {
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DECODE_DMR_AMBE, //! DMR AMBE
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DECODE_88BIT_IMBE //! 88-bit IMBE (P25)
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};
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// ---------------------------------------------------------------------------
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// Class Declaration
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// ---------------------------------------------------------------------------
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/**
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* @brief Implements MBE audio decoding.
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*/
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class HOST_SW_API MBEDecoder
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{
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public:
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/**
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* @brief Initializes a new instance of the MBEDecoder class.
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* @param mode Decoder mode.
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*/
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MBEDecoder(MBE_DECODER_MODE mode);
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/**
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* @brief Finalizes a instance of the MBEDecoder class.
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*/
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~MBEDecoder();
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/**
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* @brief Decodes the given MBE codewords to deinterleaved MBE bits using the decoder mode.
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* @param[in] codeword MBE codeword.
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* @param[out] mbeBits
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* @returns int32_t
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*/
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int32_t decodeBits(uint8_t* codeword, char* mbeBits);
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/**
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* @brief Decodes the given MBE codewords to PCM samples using the decoder mode.
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* @param[in] codeword MBE codeword.
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* @param[out] samples PCM Samples (in float format).
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* @returns int32_t
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*/
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int32_t decodeF(uint8_t* codeword, float samples[]);
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/**
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* @brief Decodes the given MBE codewords to PCM samples using the decoder mode.
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* @param[in] codeword MBE codeword.
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* @param[out] samples PCM Samples (in short format).
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* @returns int32_t
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*/
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int32_t decode(uint8_t* codeword, int16_t samples[]);
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private:
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mbelibParms* m_mbelibParms;
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MBE_DECODER_MODE m_mbeMode;
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static const int dW[72];
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static const int dX[72];
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static const int rW[36];
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static const int rX[36];
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static const int rY[36];
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static const int rZ[36];
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float gainMaxBuf[200];
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float* gainMaxBufPtr;
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int gainMaxIdx;
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public:
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/**
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* @brief Gain adjustment.
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*/
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__PROPERTY(float, gainAdjust, GainAdjust);
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/**
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* @brief Flag indicating automatic gain adjustment is enabled.
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*/
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__PROPERTY(bool, autoGain, AutoGain);
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};
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// Extern methods for C#/C++ interop
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extern "C" MBEDecoder* MBEDecoder_Create(MBE_DECODER_MODE mode) { return new MBEDecoder(mode); }
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extern "C" int32_t MBEDecoder_Decode(MBEDecoder* pDecoder, uint8_t* codeword, int16_t* samples) { return pDecoder->decode(codeword, samples); }
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extern "C" void MBEDecoder_Delete(MBEDecoder* pDecoder) { delete pDecoder; }
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} // namespace vocoder
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#endif // __MBE_DECODER_H__
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