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Delay write to pipe to simulate audio playback #1

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Delay write to pipe to simulate audio playback #1

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13 changes: 13 additions & 0 deletions playback/src/audio_backend/pipe.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,9 @@ impl Sink for StdoutSink {
}

fn write(&mut self, data: &[i16]) -> io::Result<()> {
let start = std::time::Instant::now();
let sample_length_us = ((data.len() as f32 * 14.0 / 2.0).round()) as u64;

let data: &[u8] = unsafe {
slice::from_raw_parts(
data.as_ptr() as *const u8,
Expand All @@ -37,6 +40,16 @@ impl Sink for StdoutSink {
self.0.write_all(data)?;
self.0.flush()?;

let elapsed = start.elapsed().as_micros() as u64;

if elapsed < sample_length_us {
let wait_us = sample_length_us - elapsed;
let d_us = std::time::Duration::from_micros(20);
while (start.elapsed().as_micros() as u64) < wait_us {
std::thread::sleep(d_us);
}
}

Ok(())
}
}