ObjC: Implement HW codecs in ObjC instead of C++

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodecH264.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.
  */
 
 #import <Foundation/Foundation.h>
 
 #import <WebRTC/RTCMacros.h>
 #import <WebRTC/RTCVideoCodecFactory.h>
 
-/** Class for H264 specific config. */
-typedef NS_ENUM(NSUInteger, RTCH264PacketizationMode) {
-  NonInterleaved = 0,  // Mode 1 - STAP-A, FU-A is allowed
-  SingleNalUnit        // Mode 0 - only single NALU allowed
-};
-
-RTC_EXPORT
-@interface RTCCodecSpecificInfoH264 : NSObject<RTCCodecSpecificInfo>
-
-@property(nonatomic, assign) RTCH264PacketizationMode packetizationMode;
-
-@end
-
 /** Encoder. */
 RTC_EXPORT
 @interface RTCVideoEncoderH264 : NSObject<RTCVideoEncoder>
+
+- (instancetype)initWithCodecInfo:(RTCVideoCodecInfo *)codecInfo;
+
 @end
 
 /** Decoder. */
 RTC_EXPORT
 @interface RTCVideoDecoderH264 : NSObject<RTCVideoDecoder>
 @end
 
 /** Encoder factory. */
 RTC_EXPORT
 @interface RTCVideoEncoderFactoryH264 : NSObject<RTCVideoEncoderFactory>
 @end
 
 /** Decoder factory. */
 RTC_EXPORT
 @interface RTCVideoDecoderFactoryH264 : NSObject<RTCVideoDecoderFactory>
 @end