Implement H264 codec in Objective-C classes.

webrtc/sdk/objc/Framework/Classes/Video/RTCEncodedImage.mm

 /*
  *  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 "WebRTC/RTCVideoCodec.h"
 
 #import "RTCVideoCodec+Private.h"
 
 @implementation RTCEncodedImage
 
 @synthesize buffer = _buffer;
 @synthesize encodedWidth = _encodedWidth;
 @synthesize encodedHeight = _encodedHeight;
 @synthesize timeStamp = _timeStamp;
 @synthesize captureTimeMs = _captureTimeMs;
 @synthesize ntpTimeMs = _ntpTimeMs;
 @synthesize isTimingFrame = _isTimingFrame;
 @synthesize encodeStartMs = _encodeStartMs;
 @synthesize encodeFinishMs = _encodeFinishMs;
 @synthesize frameType = _frameType;
 @synthesize rotation = _rotation;
 @synthesize completeFrame = _completeFrame;
 @synthesize qp = _qp;
+@synthesize contentType = _contentType;
 
 - (instancetype)initWithEncodedImage:(webrtc::EncodedImage)encodedImage {
   if (self = [super init]) {
     // Wrap the buffer in NSData without copying, do not take ownership.
     _buffer = [NSData dataWithBytesNoCopy:encodedImage._buffer
                                    length:encodedImage._length
                              freeWhenDone:NO];
     _encodedWidth = encodedImage._encodedWidth;
     _encodedHeight = encodedImage._encodedHeight;
     _timeStamp = encodedImage._timeStamp;
@@ skipping 25 matching lines @@
   encodedImage.timing_.encode_finish_ms = _encodeFinishMs;
   encodedImage._frameType = webrtc::FrameType(_frameType);
   encodedImage.rotation_ = webrtc::VideoRotation(_rotation);
   encodedImage._completeFrame = _completeFrame;
   encodedImage.qp_ = _qp ? _qp.intValue : -1;
 
   return encodedImage;
 }
 
 @end