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50 lines
2.1 KiB
C++
50 lines
2.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2018 F4EXB //
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// written by Edouard Griffiths //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 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 this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#ifndef SDRBASE_AUDIO_AUDIOCOMPRESSOR_H_
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#define SDRBASE_AUDIO_AUDIOCOMPRESSOR_H_
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#include <stdint.h>
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#include "export.h"
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class SDRBASE_API AudioCompressor
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{
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public:
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AudioCompressor();
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~AudioCompressor();
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void fillLUT(); //!< 4 bands
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void fillLUT2(); //!< 8 bands (default)
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void fillALaw(); //!< A-law compression to 8 bits
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void fillULaw(); //!< u-law compression to 8 bits
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int16_t compress(int16_t sample);
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int8_t compress8(int16_t sample);
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private:
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int8_t ALaw_Encode(int16_t number);
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int8_t MuLaw_Encode(int16_t number);
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int16_t m_lut[32768];
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static const uint16_t ALAW_MAX;
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static const uint16_t MULAW_MAX;
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static const uint16_t MULAW_BIAS;
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};
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#endif /* SDRBASE_AUDIO_AUDIOCOMPRESSOR_H_ */
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