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54 lines
2.8 KiB
C++
54 lines
2.8 KiB
C++
/* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
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* Copyright (C) 2011-2017 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
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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 Lesser General Public License as published by
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* the Free Software Foundation, either version 2.1 of the License, or
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* (at your option) any later version.
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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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser 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 MT32EMU_ANALOG_H
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#define MT32EMU_ANALOG_H
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#include "globals.h"
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#include "internals.h"
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#include "Enumerations.h"
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#include "Types.h"
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namespace MT32Emu {
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/* Analog class is dedicated to perform fair emulation of analogue circuitry of hardware units that is responsible
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* for processing output signal after the DAC. It appears that the analogue circuit labeled "LPF" on the schematic
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* also applies audible changes to the signal spectra. There is a significant boost of higher frequencies observed
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* aside from quite poor attenuation of the mirror spectra above 16 kHz which is due to a relatively low filter order.
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*
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* As the final mixing of multiplexed output signal is performed after the DAC, this function is migrated here from Synth.
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* Saying precisely, mixing is performed within the LPF as the entrance resistors are actually components of a LPF
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* designed using the multiple feedback topology. Nevertheless, the schematic separates them.
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*/
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class Analog {
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public:
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static Analog *createAnalog(const AnalogOutputMode mode, const bool oldMT32AnalogLPF, const RendererType rendererType);
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virtual ~Analog() {}
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virtual unsigned int getOutputSampleRate() const = 0;
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virtual Bit32u getDACStreamsLength(const Bit32u outputLength) const = 0;
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virtual void setSynthOutputGain(const float synthGain) = 0;
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virtual void setReverbOutputGain(const float reverbGain, const bool mt32ReverbCompatibilityMode) = 0;
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virtual bool process(IntSample *outStream, const IntSample *nonReverbLeft, const IntSample *nonReverbRight, const IntSample *reverbDryLeft, const IntSample *reverbDryRight, const IntSample *reverbWetLeft, const IntSample *reverbWetRight, Bit32u outLength) = 0;
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virtual bool process(FloatSample *outStream, const FloatSample *nonReverbLeft, const FloatSample *nonReverbRight, const FloatSample *reverbDryLeft, const FloatSample *reverbDryRight, const FloatSample *reverbWetLeft, const FloatSample *reverbWetRight, Bit32u outLength) = 0;
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};
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} // namespace MT32Emu
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#endif // #ifndef MT32EMU_ANALOG_H
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