Support for onbufferedamountlow

talk/app/webrtc/objc/public/RTCDataChannel.h

 /*
  * libjingle
  * Copyright 2014 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 64 matching lines @@
 // Protocol for receving data channel state and message events.
 @protocol RTCDataChannelDelegate<NSObject>
 
 // Called when the data channel state has changed.
 - (void)channelDidChangeState:(RTCDataChannel*)channel;
 
 // Called when a data buffer was successfully received.
 - (void)channel:(RTCDataChannel*)channel
     didReceiveMessageWithBuffer:(RTCDataBuffer*)buffer;
 
+@optional
+
+// Called when the buffered amount has changed.
+- (void)channel:(RTCDataChannel*)channel
+    didChangeBufferedAmount:(NSUInteger)amount;
+
 @end
 
 // ObjectiveC wrapper for a DataChannel object.
 // See talk/app/webrtc/datachannelinterface.h
 @interface RTCDataChannel : NSObject
 
 @property(nonatomic, readonly) NSString* label;
 @property(nonatomic, readonly) BOOL isReliable;
 @property(nonatomic, readonly) BOOL isOrdered;
 @property(nonatomic, readonly) NSUInteger maxRetransmitTime;
 @property(nonatomic, readonly) NSUInteger maxRetransmits;
 @property(nonatomic, readonly) NSString* protocol;
 @property(nonatomic, readonly) BOOL isNegotiated;
 @property(nonatomic, readonly) NSInteger streamId;
 @property(nonatomic, readonly) RTCDataChannelState state;
 @property(nonatomic, readonly) NSUInteger bufferedAmount;
 @property(nonatomic, weak) id<RTCDataChannelDelegate> delegate;
 
 - (void)close;
 - (BOOL)sendData:(RTCDataBuffer*)data;
 
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
 // Disallow init and don't add to documentation
 - (id)init __attribute__((
     unavailable("init is not a supported initializer for this class.")));
 #endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
 @end