51 lines
1.1 KiB
Rust
51 lines
1.1 KiB
Rust
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// TODO write tests or replace with a crate
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const SOUND_FIFO_CAPACITY: usize = 32;
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#[derive(Debug)]
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pub struct SoundFifo {
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wr_pos: usize,
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rd_pos: usize,
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count: usize,
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data: [i8; SOUND_FIFO_CAPACITY],
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}
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impl SoundFifo {
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pub fn new() -> SoundFifo {
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SoundFifo {
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wr_pos: 0,
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rd_pos: 0,
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count: 0,
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data: [0; SOUND_FIFO_CAPACITY],
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}
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}
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pub fn write(&mut self, value: i8) {
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if self.count >= SOUND_FIFO_CAPACITY {
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return;
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}
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self.data[self.wr_pos] = value;
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self.wr_pos = (self.wr_pos + 1) % SOUND_FIFO_CAPACITY;
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self.count += 1;
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}
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pub fn read(&mut self) -> i8 {
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if self.count == 0 {
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return 0;
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};
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let value = self.data[self.rd_pos];
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self.rd_pos = (self.rd_pos + 1) % SOUND_FIFO_CAPACITY;
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self.count -= 1;
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value
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}
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pub fn count(&self) -> usize {
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self.count
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}
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pub fn reset(&mut self) {
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self.wr_pos = 0;
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self.rd_pos = 0;
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self.count = 0;
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}
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}
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