iOS render: Handle frame rotation in OpenGL

webrtc/sdk/objc/Framework/Classes/RTCVideoFrame+Private.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 "WebRTC/RTCVideoFrame.h"
 
 #include "webrtc/media/base/videoframe.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
 @interface RTCVideoFrame ()
 
 @property(nonatomic, readonly)
     rtc::scoped_refptr<webrtc::VideoFrameBuffer> i420Buffer;
 
-- (instancetype)initWithNativeFrame:(const cricket::VideoFrame *)nativeFrame
+- (instancetype)initWithVideoBuffer:
+                    (rtc::scoped_refptr<webrtc::VideoFrameBuffer>)videoBuffer
+                           rotation:(int)rotation

[tkchin_webrtc, 2016/08/08 22:58:45]

would be nice to use the enum type, or have the enum explicitly be of int type

[magjed_webrtc, 2016/08/09 13:54:27]

I initially tried to use webrtc::VideoRotation, but gave up when I hit this
compile error:
../../webrtc/sdk/objc/Framework/Classes/RTCEAGLVideoView.m -o
obj/webrtc/sdk/objc/Framework/Classes/rtc_sdk_peerconnection_objc.RTCEAGLVideoView.o
In file included from
../../webrtc/sdk/objc/Framework/Classes/RTCEAGLVideoView.m:16:
In file included from
../../webrtc/sdk/objc/Framework/Headers/WebRTC//RTCVideoFrame.h:16:
../../webrtc/common_video/rotation.h:14:1: error: unknown type name 'namespace'
namespace webrtc {

I tried a little harder this time, and it seems it's enough to rename
RTCEAGLVideoView.m to RTCEAGLVideoView.mm. Is that ok to do?

+                        timeStampNs:(int64_t)timeStampNs
     NS_DESIGNATED_INITIALIZER;
 
 @end
 
 NS_ASSUME_NONNULL_END