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67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
//
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// Audio.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 09/11/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#include "Audio.hpp"
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#include <cassert>
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using namespace Amiga;
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bool Audio::advance(int channel) {
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if(channels_[channel].samples_remaining || !channels_[channel].length) {
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return false;
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}
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set_data(channel, ram_[pointer_[size_t(channel)]]);
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++pointer_[size_t(channel)];
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--channels_[channel].length;
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return false;
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}
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void Audio::set_length(int channel, uint16_t length) {
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assert(channel >= 0 && channel < 4);
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channels_[channel].length = length;
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}
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void Audio::set_period(int channel, uint16_t period) {
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assert(channel >= 0 && channel < 4);
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channels_[channel].period = period;
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}
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void Audio::set_volume(int channel, uint16_t volume) {
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assert(channel >= 0 && channel < 4);
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channels_[channel].volume = (volume & 0x40) ? 64 : (volume & 0x3f);
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}
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void Audio::set_data(int channel, uint16_t data) {
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assert(channel >= 0 && channel < 4);
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if(!channels_[channel].samples_remaining) {
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channels_[channel].period_counter = channels_[channel].period;
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}
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channels_[channel].samples_remaining = 2;
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channels_[channel].data = data;
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}
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void Audio::set_channel_enables(uint16_t enables) {
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channels_[0].dma_enabled = enables & 1;
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channels_[1].dma_enabled = enables & 2;
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channels_[2].dma_enabled = enables & 4;
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channels_[3].dma_enabled = enables & 8;
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}
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void Audio::set_modulation_flags(uint16_t) {
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}
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void Audio::run_for(HalfCycles) {
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// TODO:
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//
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// Check whether any channel's period counter is exhausted and, if
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// so, attempt to consume another sample. If there are no more samples
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// and length is 0, trigger an interrupt.
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}
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