Pad audio before WhisperX transcription

internal/transcription/client_test.go

@@ -0,0 +1,28 @@
+package transcription
+
+import (
+	"math"
+	"testing"
+	"time"
+)
+
+func TestAdjustLeadSilence(t *testing.T) {
+	got := adjustLeadSilence([]Segment{
+		{Start: 0.2, End: 1.1, Text: "first"},
+		{Start: 1.4, End: 2.0, Text: "second"},
+	}, 800*time.Millisecond)
+
+	if got[0].Start != 0 {
+		t.Fatalf("first start = %v, want 0", got[0].Start)
+	}
+	if !near(got[0].End, 0.3) {
+		t.Fatalf("first end = %v, want 0.3", got[0].End)
+	}
+	if !near(got[1].Start, 0.6) {
+		t.Fatalf("second start = %v, want 0.6", got[1].Start)
+	}
+}
+
+func near(got, want float64) bool {
+	return math.Abs(got-want) < 0.000001
+}