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64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
//
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// CompoundSource.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 19/12/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#ifndef CompoundSource_h
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#define CompoundSource_h
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#include "SampleSource.hpp"
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#include <cstring>
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namespace Outputs {
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namespace Speaker {
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/*!
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A CompoundSource adds together the sound generated by multiple individual SampleSources.
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It's an instance of template metaprogramming; this is the base case.
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*/
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template <typename... T> class CompoundSource: public Outputs::Speaker::SampleSource {
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public:
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void get_samples(std::size_t number_of_samples, std::int16_t *target) {
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std::memset(target, 0, sizeof(std::int16_t) * number_of_samples);
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}
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};
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/*!
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A CompoundSource adds together the sound generated by multiple individual SampleSources.
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It's an instance of template metaprogramming; this is the recursive case.
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*/
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template <typename T, typename... R> class CompoundSource<T, R...>: public Outputs::Speaker::SampleSource {
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public:
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CompoundSource(T &source, R &...next) : source_(source), next_source_(next...) {}
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void get_samples(std::size_t number_of_samples, std::int16_t *target) {
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// This is an ugly solution: get whatever the next source supplies and add the local
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// results to it, with the degenerate case performing a memset to supply an array of 0.
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// TODO: do better. Might need some alteration of SampleSource.
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int16_t next_samples[number_of_samples];
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next_source_.get_samples(number_of_samples, next_samples);
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source_.get_samples(number_of_samples, target);
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while(number_of_samples--) {
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target[number_of_samples] += next_samples[number_of_samples];
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}
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}
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void skip_samples(const std::size_t number_of_samples) {
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source_.skip_samples(number_of_samples);
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next_source_.skip_samples(number_of_samples);
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}
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private:
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T &source_;
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CompoundSource<R...> next_source_;
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};
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}
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}
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#endif /* CompoundSource_h */
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