Adding getParameters/setParameters APIs to RtpReceiver.

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCPeerConnection.h

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #import <Foundation/Foundation.h>
 
 #import <WebRTC/RTCMacros.h>
 
 @class RTCConfiguration;
 @class RTCDataChannel;
 @class RTCDataChannelConfiguration;
 @class RTCIceCandidate;
 @class RTCMediaConstraints;
 @class RTCMediaStream;
 @class RTCMediaStreamTrack;
 @class RTCPeerConnectionFactory;
+@class RTCRtpReceiver;
 @class RTCRtpSender;
 @class RTCSessionDescription;
 @class RTCStatsReport;
 
 NS_ASSUME_NONNULL_BEGIN
 
 extern NSString * const kRTCPeerConnectionErrorDomain;
 extern int const kRTCSessionDescriptionErrorCode;
 
 /** Represents the signaling state of the peer connection. */
@@ skipping 85 matching lines @@
 @property(nonatomic, readonly) RTCSignalingState signalingState;
 @property(nonatomic, readonly) RTCIceConnectionState iceConnectionState;
 @property(nonatomic, readonly) RTCIceGatheringState iceGatheringState;
 
 /** Gets all RTCRtpSenders associated with this peer connection.
  *  Note: reading this property returns different instances of RTCRtpSender.
  *  Use isEqual: instead of == to compare RTCRtpSender instances.
  */
 @property(nonatomic, readonly) NSArray<RTCRtpSender *> *senders;
 
+/** Gets all RTCRtpReceivers associated with this peer connection.
+ *  Note: reading this property returns different instances of RTCRtpReceiver.
+ *  Use isEqual: instead of == to compare RTCRtpReceiver instances.
+ */
+@property(nonatomic, readonly) NSArray<RTCRtpReceiver *> *receivers;
+
 - (instancetype)init NS_UNAVAILABLE;
 
 /** Sets the PeerConnection's global configuration to |configuration|.
  *  Any changes to STUN/TURN servers or ICE candidate policy will affect the
  *  next gathering phase, and cause the next call to createOffer to generate
  *  new ICE credentials. Note that the BUNDLE and RTCP-multiplexing policies
  *  cannot be changed with this method.
  */
 - (BOOL)setConfiguration:(RTCConfiguration *)configuration;
 
@@ skipping 58 matching lines @@
  */
 - (void)statsForTrack:
     (nullable RTCMediaStreamTrack *)mediaStreamTrack
      statsOutputLevel:(RTCStatsOutputLevel)statsOutputLevel
     completionHandler:
     (nullable void (^)(NSArray<RTCStatsReport *> *stats))completionHandler;
 
 @end
 
 NS_ASSUME_NONNULL_END