mirror of https://github.com/bsnes-emu/bsnes.git
83 lines
1.9 KiB
C++
83 lines
1.9 KiB
C++
#pragma once
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#include <nall/dsp/iir/one-pole.hpp>
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#include <nall/dsp/iir/biquad.hpp>
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#include <nall/dsp/resampler/cubic.hpp>
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namespace Emulator {
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struct Interface;
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struct Audio;
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struct Filter;
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struct Stream;
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struct Audio {
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auto reset(maybe<uint> channels = nothing, maybe<double> frequency = nothing) -> void;
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auto setInterface(Interface* interface) -> void;
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auto setFrequency(double frequency) -> void;
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auto setVolume(double volume) -> void;
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auto setBalance(double balance) -> void;
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auto setReverb(bool enabled) -> void;
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auto createStream(uint channels, double frequency) -> shared_pointer<Stream>;
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private:
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auto process() -> void;
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Interface* interface = nullptr;
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vector<shared_pointer<Stream>> streams;
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uint channels = 0;
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double frequency = 0.0;
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double volume = 1.0;
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double balance = 0.0;
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bool reverbEnable = false;
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vector<vector<queue<double>>> reverb;
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friend class Stream;
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};
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struct Filter {
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enum class Order : uint { First, Second };
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enum class Type : uint { LowPass, HighPass };
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Order order;
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DSP::IIR::OnePole onePole; //first-order
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DSP::IIR::Biquad biquad; //second-order
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};
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struct Stream {
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auto reset(uint channels, double inputFrequency, double outputFrequency) -> void;
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auto setFrequency(double inputFrequency, maybe<double> outputFrequency = nothing) -> void;
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auto addFilter(Filter::Order order, Filter::Type type, double cutoffFrequency, uint passes = 1) -> void;
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auto pending() const -> bool;
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auto read(double samples[]) -> uint;
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auto write(const double samples[]) -> void;
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template<typename... P> auto sample(P&&... p) -> void {
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double samples[sizeof...(P)] = {forward<P>(p)...};
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write(samples);
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}
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private:
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struct Channel {
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vector<Filter> filters;
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DSP::Resampler::Cubic resampler;
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};
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vector<Channel> channels;
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double inputFrequency;
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double outputFrequency;
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friend class Audio;
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};
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extern Audio audio;
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}
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