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48737a32a7
Previously every output device was making its own decision. Which is increasingly less sustainable due to the CompoundSource.
50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
//
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// Speaker.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 03/12/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "SoundGenerator.hpp"
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#include <cstring>
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using namespace Electron;
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SoundGenerator::SoundGenerator(Concurrency::DeferringAsyncTaskQueue &audio_queue) :
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audio_queue_(audio_queue) {}
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void SoundGenerator::set_sample_volume_range(std::int16_t range) {
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volume_ = static_cast<unsigned int>(range / 2);
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}
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void SoundGenerator::get_samples(std::size_t number_of_samples, int16_t *target) {
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if(is_enabled_) {
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while(number_of_samples--) {
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*target = static_cast<int16_t>((counter_ / (divider_+1)) * volume_);
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target++;
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counter_ = (counter_ + 1) % ((divider_+1) * 2);
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}
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} else {
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std::memset(target, 0, sizeof(int16_t) * number_of_samples);
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}
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}
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void SoundGenerator::skip_samples(std::size_t number_of_samples) {
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counter_ = (counter_ + number_of_samples) % ((divider_+1) * 2);
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}
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void SoundGenerator::set_divider(uint8_t divider) {
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audio_queue_.defer([=]() {
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divider_ = divider * 32 / clock_rate_divider;
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});
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}
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void SoundGenerator::set_is_enabled(bool is_enabled) {
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audio_queue_.defer([=]() {
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is_enabled_ = is_enabled;
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counter_ = 0;
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});
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}
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