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CLK/Machines/Electron/SoundGenerator.cpp

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//
// Speaker.cpp
// Clock Signal
//
// Created by Thomas Harte on 03/12/2016.
// Copyright 2016 Thomas Harte. All rights reserved.
//
#include "SoundGenerator.hpp"
#include <cstring>
using namespace Electron;
SoundGenerator::SoundGenerator(Concurrency::DeferringAsyncTaskQueue &audio_queue) :
audio_queue_(audio_queue) {}
void SoundGenerator::set_sample_volume_range(std::int16_t range) {
volume_ = static_cast<unsigned int>(range / 2);
}
void SoundGenerator::get_samples(std::size_t number_of_samples, int16_t *target) {
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if(is_enabled_) {
while(number_of_samples--) {
*target = static_cast<int16_t>((counter_ / (divider_+1)) * volume_);
target++;
counter_ = (counter_ + 1) % ((divider_+1) * 2);
}
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} else {
std::memset(target, 0, sizeof(int16_t) * number_of_samples);
}
}
void SoundGenerator::skip_samples(std::size_t number_of_samples) {
counter_ = (counter_ + number_of_samples) % ((divider_+1) * 2);
}
void SoundGenerator::set_divider(uint8_t divider) {
audio_queue_.defer([this, divider]() {
divider_ = divider * 32 / clock_rate_divider;
});
}
void SoundGenerator::set_is_enabled(bool is_enabled) {
audio_queue_.defer([this, is_enabled]() {
is_enabled_ = is_enabled;
counter_ = 0;
});
}