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CLK/Machines/Atari/2600/TIASound.hpp

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//
// TIASound.hpp
// Clock Signal
//
// Created by Thomas Harte on 03/12/2016.
// Copyright 2016 Thomas Harte. All rights reserved.
//
#ifndef Atari2600_TIASound_hpp
#define Atari2600_TIASound_hpp
#include "../../../Outputs/Speaker/Implementation/SampleSource.hpp"
#include "../../../Concurrency/AsyncTaskQueue.hpp"
namespace Atari2600 {
// This should be a divisor of 38; audio counters are updated every 38 cycles, though lesser dividers
// will give greater resolution to changes in audio state. 1, 2 and 19 are the only divisors of 38.
constexpr int CPUTicksPerAudioTick = 2;
2017-04-04 01:16:39 +00:00
class TIASound: public Outputs::Speaker::SampleSource {
public:
TIASound(Concurrency::DeferringAsyncTaskQueue &audio_queue);
void set_volume(int channel, uint8_t volume);
void set_divider(int channel, uint8_t divider);
void set_control(int channel, uint8_t control);
// To satisfy ::SampleSource.
void get_samples(std::size_t number_of_samples, int16_t *target);
void set_sample_volume_range(std::int16_t range);
private:
Concurrency::DeferringAsyncTaskQueue &audio_queue_;
uint8_t volume_[2];
uint8_t divider_[2];
uint8_t control_[2];
int poly4_counter_[2];
int poly5_counter_[2];
int poly9_counter_[2];
int output_state_[2];
int divider_counter_[2];
int16_t per_channel_volume_ = 0;
};
}
#endif /* Speaker_hpp */