Fix updating rate with codec reuse while disabled

While disabled the renderer does not have non-null stream formats. This means
that setting the operating rate could cause a NullPointerException if there was
a codec for reuse.

Check for being enabled/started before trying to set the operating rate. After
the renderer is enabled it should receive a new input format which will update
the operating rate as needed.

PiperOrigin-RevId: 235494384

library/core/src/main/java/com/google/android/exoplayer2/mediacodec/MediaCodecRenderer.java

@@ -559,7 +559,9 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
   @Override
   public final void setOperatingRate(float operatingRate) throws ExoPlaybackException {
     rendererOperatingRate = operatingRate;
-    if (codec != null && codecDrainAction != DRAIN_ACTION_REINITIALIZE) {
+    if (codec != null
+        && codecDrainAction != DRAIN_ACTION_REINITIALIZE
+        && getState() != STATE_DISABLED) {
       updateCodecOperatingRate();
     }
   }