Standardise API-level specific nested classes

This change aligns all the names for classes that are 'holders of static
methods' to be `ApiNN`. Classes that hold state are named meaningfully
based on that state.

PiperOrigin-RevId: 388641064

library/core/src/main/java/com/google/android/exoplayer2/audio/AudioCapabilities.java

@@ -93,7 +93,7 @@ public final class AudioCapabilities {
     // it on TV devices, which generally shouldn't support audio offload for surround encodings.
     if (Util.SDK_INT >= 29 && Util.isTv(context)) {
       return new AudioCapabilities(
-          Api29.getDirectPlaybackSupportedEncodingsV29(), DEFAULT_MAX_CHANNEL_COUNT);
+          Api29.getDirectPlaybackSupportedEncodings(), DEFAULT_MAX_CHANNEL_COUNT);
     }
     if (intent == null || intent.getIntExtra(AudioManager.EXTRA_AUDIO_PLUG_STATE, 0) == 0) {
       return DEFAULT_AUDIO_CAPABILITIES;
@@ -190,7 +190,7 @@ public final class AudioCapabilities {
   @RequiresApi(29)
   private static final class Api29 {
     @DoNotInline
-    public static int[] getDirectPlaybackSupportedEncodingsV29() {
+    public static int[] getDirectPlaybackSupportedEncodings() {
       ImmutableList.Builder<Integer> supportedEncodingsListBuilder = ImmutableList.builder();
       for (int encoding : ALL_SURROUND_ENCODINGS) {
         if (AudioTrack.isDirectPlaybackSupported(

library/core/src/main/java/com/google/android/exoplayer2/drm/DrmUtil.java

@@ -64,16 +64,13 @@ public final class DrmUtil {
   @PlaybackException.ErrorCode
   public static int getErrorCodeForMediaDrmException(
       Exception exception, @ErrorSource int errorSource) {
-    if (Util.SDK_INT >= 21 && PlatformOperationsWrapperV21.isMediaDrmStateException(exception)) {
-      return PlatformOperationsWrapperV21.mediaDrmStateExceptionToErrorCode(exception);
-    } else if (Util.SDK_INT >= 23
-        && PlatformOperationsWrapperV23.isMediaDrmResetException(exception)) {
+    if (Util.SDK_INT >= 21 && Api21.isMediaDrmStateException(exception)) {
+      return Api21.mediaDrmStateExceptionToErrorCode(exception);
+    } else if (Util.SDK_INT >= 23 && Api23.isMediaDrmResetException(exception)) {
       return PlaybackException.ERROR_CODE_DRM_SYSTEM_ERROR;
-    } else if (Util.SDK_INT >= 18
-        && PlatformOperationsWrapperV18.isNotProvisionedException(exception)) {
+    } else if (Util.SDK_INT >= 18 && Api18.isNotProvisionedException(exception)) {
       return PlaybackException.ERROR_CODE_DRM_PROVISIONING_FAILED;
-    } else if (Util.SDK_INT >= 18
-        && PlatformOperationsWrapperV18.isDeniedByServerException(exception)) {
+    } else if (Util.SDK_INT >= 18 && Api18.isDeniedByServerException(exception)) {
       return PlaybackException.ERROR_CODE_DRM_DEVICE_REVOKED;
     } else if (exception instanceof UnsupportedDrmException) {
       return PlaybackException.ERROR_CODE_DRM_SCHEME_UNSUPPORTED;
@@ -98,7 +95,7 @@ public final class DrmUtil {
   // Internal classes.
 
   @RequiresApi(18)
-  private static final class PlatformOperationsWrapperV18 {
+  private static final class Api18 {
 
     @DoNotInline
     public static boolean isNotProvisionedException(@Nullable Throwable throwable) {
@@ -112,7 +109,7 @@ public final class DrmUtil {
   }
 
   @RequiresApi(21)
-  private static final class PlatformOperationsWrapperV21 {
+  private static final class Api21 {
 
     @DoNotInline
     public static boolean isMediaDrmStateException(@Nullable Throwable throwable) {
@@ -130,7 +127,7 @@ public final class DrmUtil {
   }
 
   @RequiresApi(23)
-  private static final class PlatformOperationsWrapperV23 {
+  private static final class Api23 {
 
     @DoNotInline
     public static boolean isMediaDrmResetException(@Nullable Throwable throwable) {

library/core/src/main/java/com/google/android/exoplayer2/upstream/FileDataSource.java

@@ -192,7 +192,7 @@ public final class FileDataSource extends BaseDataSource {
       // different SDK versions.
       throw new FileDataSourceException(
           e,
-          Util.SDK_INT >= 21 && PlatformOperationsWrapperV21.isPermissionError(e.getCause())
+          Util.SDK_INT >= 21 && Api21.isPermissionError(e.getCause())
               ? PlaybackException.ERROR_CODE_IO_NO_PERMISSION
               : PlaybackException.ERROR_CODE_IO_FILE_NOT_FOUND);
     } catch (SecurityException e) {
@@ -203,7 +203,7 @@ public final class FileDataSource extends BaseDataSource {
   }
 
   @RequiresApi(21)
-  private static final class PlatformOperationsWrapperV21 {
+  private static final class Api21 {
     @DoNotInline
     private static boolean isPermissionError(@Nullable Throwable e) {
       return e instanceof ErrnoException && ((ErrnoException) e).errno == OsConstants.EACCES;

library/core/src/main/java/com/google/android/exoplayer2/video/VideoFrameReleaseHelper.java

@@ -347,7 +347,7 @@ public final class VideoFrameReleaseHelper {
       return;
     }
     this.surfacePlaybackFrameRate = surfacePlaybackFrameRate;
-    SurfaceApi30.setFrameRate(surface, surfacePlaybackFrameRate);
+    Api30.setSurfaceFrameRate(surface, surfacePlaybackFrameRate);
   }
 
   /** Clears the frame-rate of the current {@link #surface}. */
@@ -356,7 +356,7 @@ public final class VideoFrameReleaseHelper {
       return;
     }
     surfacePlaybackFrameRate = 0;
-    SurfaceApi30.setFrameRate(surface, /* frameRate= */ 0);
+    Api30.setSurfaceFrameRate(surface, /* frameRate= */ 0);
   }
 
   // Display refresh rate and vsync logic.
@@ -408,9 +408,9 @@ public final class VideoFrameReleaseHelper {
   // Nested classes.
 
   @RequiresApi(30)
-  private static final class SurfaceApi30 {
+  private static final class Api30 {
     @DoNotInline
-    public static void setFrameRate(Surface surface, float frameRate) {
+    public static void setSurfaceFrameRate(Surface surface, float frameRate) {
       int compatibility =
           frameRate == 0
               ? Surface.FRAME_RATE_COMPATIBILITY_DEFAULT