91 lines
2.3 KiB
C++
91 lines
2.3 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_IMBE_DECODER_H
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#define INCLUDED_IMBE_DECODER_H
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#include <boost/noncopyable.hpp>
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#include <boost/shared_ptr.hpp>
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#include <deque>
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#include <vector>
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typedef std::deque<float> audio_samples;
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typedef std::vector<bool> voice_codeword;
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typedef boost::shared_ptr<class imbe_decoder> imbe_decoder_sptr;
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/**
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* imbe_decoder is the interface to the various mechanisms for
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* translating P25 voice codewords into audio samples.
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*/
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class imbe_decoder : public boost::noncopyable {
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public:
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/**
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* imbe_decoder (virtual) constructor. The exact subclass
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* instantiated depends on some yet-to-be-decided magic.
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*
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* \return A shared_ptr to an imbe_decoder.
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*/
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static imbe_decoder_sptr make();
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/**
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* imbe_decoder (virtual) destructor.
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*/
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virtual ~imbe_decoder();
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/**
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* Decode the compressed IMBE audio.
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*
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* \param cw IMBE codeword (including parity check bits).
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*/
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virtual void decode(const voice_codeword& cw) = 0;
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/**
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* Returns the audio_samples samples. These are mono samples at
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* 8KS/s represented as a float in the range -1.0 .. +1.0.
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*
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* \return A non-null pointer to a deque<float> of audio samples.
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*/
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audio_samples *audio();
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protected:
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/**
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* Construct an instance of imbe_decoder. Access is protected
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* because this is an abstract class and users should call
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* make_imbe_decoder to construct concrete instances.
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*/
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imbe_decoder();
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private:
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/**
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* The audio samples produced by the IMBE decoder.
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*/
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audio_samples d_audio;
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};
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#endif /* INCLUDED_IMBE_DECODER_H */
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