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124 lines
3.4 KiB
C++
124 lines
3.4 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 <cassert>
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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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An owner may optionally assign relative volumes.
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*/
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template <typename... T> class CompoundSource:
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public Outputs::Speaker::SampleSource {
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public:
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CompoundSource(T &... sources) : source_holder_(sources...) {
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// Default: give all sources equal volume.
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const float volume = 1.0f / static_cast<float>(source_holder_.size());
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for(std::size_t c = 0; c < source_holder_.size(); ++c) {
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volumes_.push_back(volume);
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}
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}
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void get_samples(std::size_t number_of_samples, std::int16_t *target) {
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source_holder_.get_samples(number_of_samples, target);
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}
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void skip_samples(const std::size_t number_of_samples) {
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source_holder_.skip_samples(number_of_samples);
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}
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void set_sample_volume_range(int16_t range) {
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volume_range_ = range;
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push_volumes();
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source_holder_.set_scaled_volume_range(range, volumes_.data());
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}
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/*!
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Sets the relative volumes of the various sources underlying this
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compound. The caller should ensure that the number of items supplied
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matches the number of sources and that the values in it sum to 1.0.
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*/
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void set_relative_volumes(const std::vector<float> &volumes) {
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assert(volumes.size() == source_holder_.size());
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volumes_ = volumes;
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push_volumes();
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}
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private:
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void push_volumes() {
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source_holder_.set_scaled_volume_range(volume_range_, volumes_.data());
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}
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template <typename... S> class CompoundSourceHolder: 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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void set_scaled_volume_range(int16_t range, float *volumes) {}
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std::size_t size() {
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return 0;
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}
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};
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template <typename S, typename... R> class CompoundSourceHolder<S, R...> {
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public:
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CompoundSourceHolder(S &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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if(source_.is_zero_level()) {
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source_.skip_samples(number_of_samples);
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next_source_.get_samples(number_of_samples, target);
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} else {
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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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}
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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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void set_scaled_volume_range(int16_t range, float *volumes) {
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source_.set_sample_volume_range(static_cast<int16_t>(static_cast<float>(range * volumes[0])));
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next_source_.set_scaled_volume_range(range, &volumes[1]);
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}
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std::size_t size() {
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return 1+next_source_.size();
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}
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private:
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S &source_;
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CompoundSourceHolder<R...> next_source_;
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};
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CompoundSourceHolder<T...> source_holder_;
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std::vector<float> volumes_;
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int16_t volume_range_ = 0;
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};
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}
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}
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#endif /* CompoundSource_h */
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