62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
//
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// AudioToggle.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 17/04/2018.
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// Copyright 2018 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include "Outputs/Speaker/Implementation/BufferSource.hpp"
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#include "Concurrency/AsyncTaskQueue.hpp"
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namespace Audio {
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/*!
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Provides a sample source that can programmatically be set to a fixed value
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*/
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class DAC: public Outputs::Speaker::BufferSource<DAC, false> {
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public:
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DAC(Concurrency::AsyncTaskQueue<false> &audio_queue, int16_t max);
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template <Outputs::Speaker::Action action>
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void apply_samples(const std::size_t number_of_samples, Outputs::Speaker::MonoSample *const target) {
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Outputs::Speaker::fill<action>(target, target + number_of_samples, level_);
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}
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void set_sample_volume_range(const std::int16_t range);
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bool is_zero_level() const {
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return !level_;
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}
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void set_output(int16_t);
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int16_t get_output() const;
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private:
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// Accessed on the calling thread.
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int16_t set_output_ = 0;
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Concurrency::AsyncTaskQueue<false> &audio_queue_;
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// Accessed on the audio thread.
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int16_t level_ = 0, volume_ = 0;
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int16_t output_ = 0, max_output_ = 0;
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void update_level();
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};
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/*!
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Provides a 1-bit specialisation of the DAC.
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*/
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struct Toggle: public DAC {
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Toggle(Concurrency::AsyncTaskQueue<false> &audio_queue) :
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DAC(audio_queue, 1) {}
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void set_output(const bool enabled) {
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DAC::set_output(enabled);
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}
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bool get_output() const {
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return bool(DAC::get_output());
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}
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};
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}
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