examples/custom-sound-stream: Print time progress while playing

examples/custom-sound-stream.rs

@@ -5,11 +5,15 @@ use sfml::{
 
 // Melody by ryg - https://youtu.be/tCRPUv8V22o?t=176
 struct BitMelody {
-    buf: [i16; 2048],
+    buf: [i16; BUF_SIZE],
     t: i32,
-    amp: i16,
+    vol: i16,
 }
 
+const FULLVOL_DURATION: i32 = 1_048_576;
+const INIT_VOL: i16 = 128;
+const BUF_SIZE: usize = 2048;
+
 impl SoundStream for BitMelody {
     fn get_data(&mut self) -> (&mut [i16], bool) {
         for buf_sample in self.buf.iter_mut() {
@@ -20,13 +24,13 @@ impl SoundStream for BitMelody {
             let note = t * (i32::from(melody[index as usize]) & 15);
             let sample = ((note / 12) & 128)
                 + ((((((t >> 12) ^ ((t >> 12) - 2)) % 11 * t) / 4) | t >> 13) & 127);
-            *buf_sample = sample as i16 * self.amp;
+            *buf_sample = sample as i16 * self.vol;
             // Fade out after a while
-            if t > 1_048_576 && t % 4096 == 0 {
-                self.amp -= 1;
+            if t > FULLVOL_DURATION && t % 4096 == 0 {
+                self.vol -= 1;
             }
         }
-        (&mut self.buf[..], self.amp > 0)
+        (&mut self.buf[..], self.vol > 0)
     }
     fn seek(&mut self, offset: Time) {
         // Not exactly correct, but meh.
@@ -43,18 +47,25 @@ impl SoundStream for BitMelody {
 impl BitMelody {
     fn new() -> Self {
         BitMelody {
-            buf: [0; 2048],
+            buf: [0; BUF_SIZE],
             t: 0,
-            amp: 128,
+            vol: INIT_VOL,
         }
     }
+    fn total_duration_samples(&self) -> usize {
+        (FULLVOL_DURATION + INIT_VOL as i32 * 4096) as usize
+    }
 }
 
 fn main() {
     let mut stream = BitMelody::new();
+    let total_dur = stream.total_duration_samples() as f32 / stream.sample_rate() as f32;
     let mut player = SoundStreamPlayer::new(&mut stream);
     player.play();
     while player.status() == SoundStatus::PLAYING {
+        let current = player.playing_offset().as_seconds();
+        eprint!("Playing custom sound stream: {current:06.03}/{total_dur:06.03}\r");
         std::thread::sleep(std::time::Duration::from_millis(100));
     }
+    eprintln!();
 }