Make EncoderBitrateProvider and implementations package private.

There is no API to allow applications to use these currently. Until
that exists, these classes do not need to be public.

PiperOrigin-RevId: 500792401

libraries/transformer/src/main/java/androidx/media3/transformer/DeviceMappedEncoderBitrateProvider.java

@@ -22,7 +22,7 @@ import androidx.media3.common.util.Util;
 
 
 /** Provides encoder bitrates that should target 0.95 SSIM or higher, accounting for device used. */
 /** Provides encoder bitrates that should target 0.95 SSIM or higher, accounting for device used. */
 @UnstableApi
 @UnstableApi
-public class DeviceMappedEncoderBitrateProvider implements EncoderBitrateProvider {
+/* package */ class DeviceMappedEncoderBitrateProvider implements EncoderBitrateProvider {
 
 
   @Override
   @Override
   public int getBitrate(String encoderName, int width, int height, float frameRate) {
   public int getBitrate(String encoderName, int width, int height, float frameRate) {

libraries/transformer/src/main/java/androidx/media3/transformer/EncoderBitrateProvider.java

@@ -21,7 +21,7 @@ import androidx.media3.common.util.UnstableApi;
 
 
 /** Provides bitrates for encoders to use as a target. */
 /** Provides bitrates for encoders to use as a target. */
 @UnstableApi
 @UnstableApi
-public interface EncoderBitrateProvider {
+/* package */ interface EncoderBitrateProvider {
 
 
   /**
   /**
    * Returns a recommended bitrate that the encoder should target.
    * Returns a recommended bitrate that the encoder should target.