Fix NPE in Transformer.getProgress()

If muxerWrapper.release() was throwing an exception, the progress state
was not updated and getProgress could throw an exception.

#minor-release

PiperOrigin-RevId: 424696783

RELEASENOTES.md

@@ -112,6 +112,8 @@
     *   Add `TransformationRequest` for specifying the transformation options.
     *   Add `TransformationRequest` for specifying the transformation options.
     *   Allow multiple listeners to be registered.
     *   Allow multiple listeners to be registered.
     *   Fix Transformer being stuck when the codec output is partially read.
     *   Fix Transformer being stuck when the codec output is partially read.
+    *   Fix potential NPE in `Transformer.getProgress` when releasing the muxer
+        throws.
 *   MediaSession extension:
 *   MediaSession extension:
     *   Remove deprecated call to `onStop(/* reset= */ true)` and provide an
     *   Remove deprecated call to `onStop(/* reset= */ true)` and provide an
         opt-out flag for apps that don't want to clear the playlist on stop.
         opt-out flag for apps that don't want to clear the playlist on stop.

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/Transformer.java

@@ -774,6 +774,7 @@ public final class Transformer {
    */
    */
   private void releaseResources(boolean forCancellation) throws TransformationException {
   private void releaseResources(boolean forCancellation) throws TransformationException {
     verifyApplicationThread();
     verifyApplicationThread();
+    progressState = PROGRESS_STATE_NO_TRANSFORMATION;
     if (player != null) {
     if (player != null) {
       player.release();
       player.release();
       player = null;
       player = null;
@@ -787,7 +788,6 @@ public final class Transformer {
       }
       }
       muxerWrapper = null;
       muxerWrapper = null;
     }
     }
-    progressState = PROGRESS_STATE_NO_TRANSFORMATION;
   }
   }
 
 
   private void verifyApplicationThread() {
   private void verifyApplicationThread() {