Fix 4 ErrorProneStyle findings:

* @Encoding is not a TYPE_USE annotation, so should appear before any modifiers and after Javadocs.
  (see go/java-style#s4.8.5-annotations) (2 times)
* @Nullable is not a TYPE_USE annotation, so should appear before any modifiers and after Javadocs.
  (see go/java-style#s4.8.5-annotations) (2 times)

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(go/clrobot). The affected code paths have been enabled for CL Robot in //depot/google3/java/com/google/android/libraries/exoplayer/METADATA which is reachable following include_presubmits from //depot/google3/third_party/java_src/android_libs/media/METADATA.
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#codehealth

PiperOrigin-RevId: 370048160

extensions/ffmpeg/src/main/java/com/google/android/exoplayer2/ext/ffmpeg/FfmpegAudioDecoder.java

@@ -43,7 +43,7 @@ import java.util.List;
 
 
   private final String codecName;
   private final String codecName;
   @Nullable private final byte[] extraData;
   @Nullable private final byte[] extraData;
-  private final @C.Encoding int encoding;
+  @C.Encoding private final int encoding;
   private final int outputBufferSize;
   private final int outputBufferSize;
 
 
   private long nativeContext; // May be reassigned on resetting the codec.
   private long nativeContext; // May be reassigned on resetting the codec.
@@ -98,7 +98,8 @@ import java.util.List;
   }
   }
 
 
   @Override
   @Override
-  protected @Nullable FfmpegDecoderException decode(
+  @Nullable
+  protected FfmpegDecoderException decode(
       DecoderInputBuffer inputBuffer, SimpleOutputBuffer outputBuffer, boolean reset) {
       DecoderInputBuffer inputBuffer, SimpleOutputBuffer outputBuffer, boolean reset) {
     if (reset) {
     if (reset) {
       nativeContext = ffmpegReset(nativeContext, extraData);
       nativeContext = ffmpegReset(nativeContext, extraData);
@@ -159,7 +160,8 @@ import java.util.List;
   }
   }
 
 
   /** Returns the encoding of output audio. */
   /** Returns the encoding of output audio. */
-  public @C.Encoding int getEncoding() {
+  @C.Encoding
+  public int getEncoding() {
     return encoding;
     return encoding;
   }
   }
 
 
@@ -167,7 +169,8 @@ import java.util.List;
    * Returns FFmpeg-compatible codec-specific initialization data ("extra data"), or {@code null} if
    * Returns FFmpeg-compatible codec-specific initialization data ("extra data"), or {@code null} if
    * not required.
    * not required.
    */
    */
-  private static @Nullable byte[] getExtraData(String mimeType, List<byte[]> initializationData) {
+  @Nullable
+  private static byte[] getExtraData(String mimeType, List<byte[]> initializationData) {
     switch (mimeType) {
     switch (mimeType) {
       case MimeTypes.AUDIO_AAC:
       case MimeTypes.AUDIO_AAC:
       case MimeTypes.AUDIO_OPUS:
       case MimeTypes.AUDIO_OPUS: