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Use a constant for the engine loop duration

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This commit is contained in:
Pierre Krieger 2015-09-27 10:10:33 +02:00
parent bc6f78de4c
commit 4671ed2678
1 changed files with 8 additions and 3 deletions
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11
src/engine.rs
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@ -16,6 +16,11 @@ use conversions::Sample;
use time;
/// Duration of a loop of the engine in milliseconds.
const FIXED_STEP_MS: u32 = 17;
/// Duration of a loop of the engine in nanoseconds.
const FIXED_STEP_NS: u64 = FIXED_STEP_MS as u64 * 1000000;
/// The internal engine of this library.
///
/// Each `Engine` owns a thread that runs in the background and plays the audio.
@ -180,7 +185,7 @@ fn background(rx: Receiver<Command>) {
// starting the output
{
let mut buffer = {
let samples_to_write = voice.get_samples_rate().0 * voice.get_channels() as u32 * 17 / 1000;
let samples_to_write = voice.get_samples_rate().0 * voice.get_channels() as u32 * FIXED_STEP_MS / 1000;
voice.append_data(samples_to_write as usize)
};
@ -201,9 +206,9 @@ fn background(rx: Receiver<Command>) {
voice.play();
}
// sleeping so that we get a loop every 17ms
// sleeping so that we get a loop every `FIXED_STEP_MS` millisecond
let time_taken = time::precise_time_ns() - before_updates;
let sleep = 17000000u64.saturating_sub(time_taken);
let sleep = FIXED_STEP_NS.saturating_sub(time_taken);
thread::park_timeout_ms((sleep / 1000000) as u32);
}
}