Fix negative queue size (#539)

* fix negative queue size

* clearer formatting

* Create lemon-laws-wave.md

---------

Co-authored-by: lukasIO <mail@lukasseiler.de>

Author: matej-dataqueue

.changeset/lemon-laws-wave.md

@@ -0,0 +1,5 @@
+---
+"@livekit/rtc-node": patch
+---
+
+Fix negative queue size on captureFrame

packages/livekit-rtc/src/audio_source.ts

@@ -115,7 +115,7 @@ export class AudioSource {
     const now = Number(process.hrtime.bigint() / BigInt(1000000));
     const elapsed = this.lastCapture === 0 ? 0 : now - this.lastCapture;
     const frameDurationMs = (frame.samplesPerChannel / frame.sampleRate) * 1000;
-    this.currentQueueSize += frameDurationMs - elapsed;
+    this.currentQueueSize = Math.max(this.currentQueueSize - elapsed, 0) + frameDurationMs;
 
     this.lastCapture = now;