major remote desktop upgrades + do opus. Hopefully all the tests pass 😭

Overlord-Client/cmd/agent/handlers/webrtc_audio_test.go

@@ -0,0 +1,27 @@
+package handlers
+
+import (
+	"encoding/binary"
+	"testing"
+)
+
+func TestDesktopAudioLegacyPCMDownmixesAndDecimates(t *testing.T) {
+	// Three 48 kHz stereo frames become one 16 kHz mono sample. Stereo frame
+	// means are 2000, 4000, and 6000; their anti-aliasing mean is 4000.
+	input := make([]byte, 0, 12)
+	for _, pair := range [][2]int16{{1000, 3000}, {3000, 5000}, {5000, 7000}} {
+		input = binary.LittleEndian.AppendUint16(input, uint16(pair[0]))
+		input = binary.LittleEndian.AppendUint16(input, uint16(pair[1]))
+	}
+	converter := &desktopAudioLegacyConverter{}
+	if out := converter.Convert(input[:5]); len(out) != 0 {
+		t.Fatalf("fragment produced %d bytes before a complete window", len(out))
+	}
+	out := converter.Convert(input[5:])
+	if len(out) != 2 {
+		t.Fatalf("legacy PCM length = %d, want 2", len(out))
+	}
+	if got := int16(binary.LittleEndian.Uint16(out)); got != 4000 {
+		t.Fatalf("legacy PCM sample = %d, want 4000", got)
+	}
+}