95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
/* -*- C++ -*- */
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/*
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* Copyright 2008 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_VOICE_DATA_UNIT_H
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#define INCLUDED_VOICE_DATA_UNIT_H
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#include "abstract_data_unit.h"
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/**
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* P25 Logical Data Unit 1 (compressed IBME voice).
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*/
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class voice_data_unit : public abstract_data_unit
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{
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public:
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/**
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* voice_data_unit (virtual) destuctor
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*/
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virtual ~voice_data_unit();
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const static int LSD_BYTE_COUNT=2;
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private:
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union {
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uint8_t d_lsd_byte[LSD_BYTE_COUNT];
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uint16_t d_lsdw;
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};
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bool d_lsdw_valid;
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bool d_lsd_byte_valid[LSD_BYTE_COUNT];
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protected:
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/**
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* voice_data_unit constuctor
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*
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* \param frame_body A const_bit_queue representing the frame body.
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*/
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voice_data_unit(const_bit_queue& frame_body);
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/**
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* Applies error correction code to the specified bit_vector. Not
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* that this function removes the PN sequences from the source
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* frame.
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*
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* \param frame_body The bit vector to decode.
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* \return
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*/
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virtual void do_correct_errors(bit_vector& frame_body);
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/**
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* Decode compressed audio using the supplied imbe_decoder.
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*
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* \param frame_body The const_bit_vector to decode.
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* \param imbe The imbe_decoder to use to generate the audio.
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*/
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virtual void do_decode_audio(const_bit_vector& frame_body, imbe_decoder& imbe, crypto_module::sptr crypto_mod);
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/**
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* Returns the expected size (in bits) of this data_unit. For
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* variable-length data this should return UINT16_MAX until the
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* actual length of this frame is known.
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*
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* \return The expected size (in bits) of this data_unit when encoded.
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*/
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virtual uint16_t frame_size_max() const;
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virtual uint16_t lsdw() const;
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virtual bool lsdw_valid() const;
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};
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#endif /* INCLUDED_VOICE_DATA_UNIT_H */
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