Add new codec for FlexFEC.

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

 /*
  *  Copyright 2016 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>
 
 NS_ASSUME_NONNULL_BEGIN
 
 RTC_EXTERN const NSString * const kRTCRtxCodecMimeType;
 RTC_EXTERN const NSString * const kRTCRedCodecMimeType;
 RTC_EXTERN const NSString * const kRTCUlpfecCodecMimeType;
+RTC_EXTERN const NSString * const kRTCFlexfecCodecMimeType;
 RTC_EXTERN const NSString * const kRTCOpusCodecMimeType;
 RTC_EXTERN const NSString * const kRTCIsacCodecMimeType;
 RTC_EXTERN const NSString * const kRTCL16CodecMimeType;
 RTC_EXTERN const NSString * const kRTCG722CodecMimeType;
 RTC_EXTERN const NSString * const kRTCIlbcCodecMimeType;
 RTC_EXTERN const NSString * const kRTCPcmuCodecMimeType;
 RTC_EXTERN const NSString * const kRTCPcmaCodecMimeType;
 RTC_EXTERN const NSString * const kRTCDtmfCodecMimeType;
 RTC_EXTERN const NSString * const kRTCComfortNoiseCodecMimeType;
 RTC_EXTERN const NSString * const kRTCVp8CodecMimeType;
@@ skipping 19 matching lines @@
 @property(nonatomic, assign) int clockRate;
 
 /** The number of channels (mono=1, stereo=2). */
 @property(nonatomic, assign) int channels;
 
 - (instancetype)init NS_DESIGNATED_INITIALIZER;
 
 @end
 
 NS_ASSUME_NONNULL_END