1 /* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher 2 * Copyright (C) 2011-2017 Dean Beeler, Jerome Fisher, Sergey V. Mikayev 3 * 4 * This program is free software: you can redistribute it and/or modify 5 * it under the terms of the GNU Lesser General Public License as published by 6 * the Free Software Foundation, either version 2.1 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public License 15 * along with this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #ifndef MT32EMU_ANALOG_H 19 #define MT32EMU_ANALOG_H 20 21 #include "globals.h" 22 #include "internals.h" 23 #include "Enumerations.h" 24 #include "Types.h" 25 26 namespace MT32Emu { 27 28 /* Analog class is dedicated to perform fair emulation of analogue circuitry of hardware units that is responsible 29 * for processing output signal after the DAC. It appears that the analogue circuit labeled "LPF" on the schematic 30 * also applies audible changes to the signal spectra. There is a significant boost of higher frequencies observed 31 * aside from quite poor attenuation of the mirror spectra above 16 kHz which is due to a relatively low filter order. 32 * 33 * As the final mixing of multiplexed output signal is performed after the DAC, this function is migrated here from Synth. 34 * Saying precisely, mixing is performed within the LPF as the entrance resistors are actually components of a LPF 35 * designed using the multiple feedback topology. Nevertheless, the schematic separates them. 36 */ 37 class Analog { 38 public: 39 static Analog *createAnalog(const AnalogOutputMode mode, const bool oldMT32AnalogLPF, const RendererType rendererType); 40 ~Analog()41 virtual ~Analog() {} 42 virtual unsigned int getOutputSampleRate() const = 0; 43 virtual Bit32u getDACStreamsLength(const Bit32u outputLength) const = 0; 44 virtual void setSynthOutputGain(const float synthGain) = 0; 45 virtual void setReverbOutputGain(const float reverbGain, const bool mt32ReverbCompatibilityMode) = 0; 46 47 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; 48 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; 49 }; 50 51 } // namespace MT32Emu 52 53 #endif // #ifndef MT32EMU_ANALOG_H 54