Release sample pipelines before asset loaders

The video asset loader renders decoder output to a surface texture, and if the
video sample pipeline is in the process of updating the surface texture image
at the moment when the asset loader video decoder is released this seems to
cause `MediaCodec.release` to get stuck.

Swap the release order so that we stop updating the texture before trying to
release the codec.

PiperOrigin-RevId: 523401619

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

@@ -343,9 +343,12 @@ private void endInternal(@EndReason int endReason, @Nullable ExportException exp
     boolean releasedPreviously = released;
     if (!released) {
       released = true;
-      for (int i = 0; i < sequenceAssetLoaders.size(); i++) {
+      // The video sample pipeline can hold buffers from the asset loader's decoder in a surface
+      // texture, so we release the video sample pipeline first to avoid releasing the codec while
+      // its buffers are pending processing.
+      for (int i = 0; i < samplePipelines.size(); i++) {
         try {
-          sequenceAssetLoaders.get(i).release();
+          samplePipelines.get(i).release();
         } catch (RuntimeException e) {
           if (releaseExportException == null) {
             releaseExportException = ExportException.createForUnexpected(e);
@@ -355,9 +358,9 @@ private void endInternal(@EndReason int endReason, @Nullable ExportException exp
           }
         }
       }
-      for (int i = 0; i < samplePipelines.size(); i++) {
+      for (int i = 0; i < sequenceAssetLoaders.size(); i++) {
         try {
-          samplePipelines.get(i).release();
+          sequenceAssetLoaders.get(i).release();
         } catch (RuntimeException e) {
           if (releaseExportException == null) {
             releaseExportException = ExportException.createForUnexpected(e);