Make ffmpeg pause nonblocking

gumble/gumbleffmpeg/stream_test.go

@@ -0,0 +1,22 @@
+package gumbleffmpeg
+
+import (
+	"testing"
+	"time"
+)
+
+// Regression: Pause sent on an unbuffered channel after the process had
+// exited, leaving callers blocked forever.
+func TestPauseDoesNotBlockWhenProcessHasExited(t *testing.T) {
+	s := &Stream{state: StatePlaying, pause: make(chan struct{}, 1)}
+	done := make(chan error, 1)
+	go func() { done <- s.Pause() }()
+	select {
+	case err := <-done:
+		if err != nil {
+			t.Fatal(err)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Pause blocked after process exit")
+	}
+}