https://source.android.com/ 
public interface android.media.IRemoteVolumeController extends android.os.IInterface
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: android.media.IRemoteVolumeController
  super_class: java.lang.Object
{
  public abstract void remoteVolumeChanged(android.media.session.ISessionController, int);
    descriptor: (Landroid/media/session/ISessionController;I)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws android.os.RemoteException
    MethodParameters:
         Name  Flags
      session  
      flags    

  public abstract void updateRemoteController(android.media.session.ISessionController);
    descriptor: (Landroid/media/session/ISessionController;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws android.os.RemoteException
    MethodParameters:
         Name  Flags
      session  
}
SourceFile: "IRemoteVolumeController.java"
NestMembers:
  android.media.IRemoteVolumeController$Stub  android.media.IRemoteVolumeController$Stub$Proxy
InnerClasses:
  public abstract Stub = android.media.IRemoteVolumeController$Stub of android.media.IRemoteVolumeController