Generalise UnhandledAudioFormatException for non-input use cases.

PiperOrigin-RevId: 505084963

library/common/src/main/java/com/google/android/exoplayer2/audio/AudioProcessor.java

@@ -99,11 +99,15 @@ public interface AudioProcessor {
     }
   }
 
-  /** Exception thrown when a processor can't be configured for a given input audio format. */
+  /** Exception thrown when the given {@link AudioFormat} can not be handled. */
   final class UnhandledAudioFormatException extends Exception {
 
     public UnhandledAudioFormatException(AudioFormat inputAudioFormat) {
-      super("Unhandled format: " + inputAudioFormat);
+      this("Unhandled input format:", inputAudioFormat);
+    }
+
+    public UnhandledAudioFormatException(String message, AudioFormat audioFormat) {
+      super(message + " " + audioFormat);
     }
   }
 

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

@@ -74,7 +74,8 @@ import java.nio.ByteBuffer;
       case C.ENCODING_PCM_FLOAT:
         return new FloatAudioMixingAlgorithm(mixingAudioFormat);
       default:
-        throw new UnhandledAudioFormatException(mixingAudioFormat);
+        throw new UnhandledAudioFormatException(
+            "No supported mixing algorithm available.", mixingAudioFormat);
     }
   }
 }