Make a friendlier RTCVideoCodecInfo initializer.

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

 /*
  *  Copyright 2017 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.
  */
 
@@ skipping 82 matching lines @@
 
 typedef NS_ENUM(NSUInteger, RTCVideoCodecMode) {
   RTCVideoCodecModeRealtimeVideo,
   RTCVideoCodecModeScreensharing,
 };
 
 /** Holds information to identify a codec. Corresponds to cricket::VideoCodec. */
 RTC_EXPORT
 @interface RTCVideoCodecInfo : NSObject
 
-- (instancetype)initWithPayload:(NSInteger)payload
-                           name:(NSString *)name
-                     parameters:(NSDictionary<NSString *, NSString *> *)parameters;
+- (instancetype)init NS_UNAVAILABLE;
+
+- (instancetype)initWithName:(NSString *)name
+                  parameters:(nullable NSDictionary<NSString *, NSString *> *)parameters
+    NS_DESIGNATED_INITIALIZER;
 
 @property(nonatomic, readonly) NSInteger payload;
 @property(nonatomic, readonly) NSString *name;
 @property(nonatomic, readonly) NSDictionary<NSString *, NSString *> *parameters;
 
 @end
 
 /** Settings for encoder. Corresponds to webrtc::VideoCodec. */
 RTC_EXPORT
 @interface RTCVideoEncoderSettings : NSObject
@@ skipping 58 matching lines @@
 - (NSInteger)decode:(RTCEncodedImage *)encodedImage
           missingFrames:(BOOL)missingFrames
     fragmentationHeader:(RTCRtpFragmentationHeader *)fragmentationHeader
       codecSpecificInfo:(__nullable id<RTCCodecSpecificInfo>)info
            renderTimeMs:(int64_t)renderTimeMs;
 - (NSString *)implementationName;
 
 @end
 
 NS_ASSUME_NONNULL_END