fix: different audio frame size than 10ms (#72)

examples/wgpu_room/src/sine_track.rs

@@ -12,6 +12,7 @@ struct FrameData {
     pub sample_rate: u32,
     pub freq: f64,
     pub amplitude: f64,
+    pub phase: u64,
 }
 
 impl Default for FrameData {
@@ -20,6 +21,7 @@ impl Default for FrameData {
             sample_rate: 48000,
             freq: 440.0,
             amplitude: 1.0,
+            phase: 0,
         }
     }
 }
@@ -98,7 +100,7 @@ impl SineTrack {
         loop {
             interval.tick().await;
 
-            let data = frame_options.lock();
+            let mut data = frame_options.lock();
             let samples_count_10ms = (data.sample_rate / 100) as usize;
 
             if samples_10ms.capacity() != samples_count_10ms {
@@ -108,10 +110,13 @@ impl SineTrack {
             for i in 0..samples_count_10ms {
                 let val = data.amplitude
                     * f64::sin(
-                        std::f64::consts::PI * 2.0 * data.freq * i as f64
-                            / samples_count_10ms as f64,
+                        std::f64::consts::PI
+                            * 2.0
+                            * data.freq
+                            * (data.phase as f64 / data.sample_rate as f64),
                     );
 
+                data.phase += 1;
                 // WebRTC uses 16-bit signed PCM
                 samples_10ms[i] = (val * 32768.0) as i16;
             }