iOS render: Handle frame rotation in OpenGL

webrtc/sdk/objc/Framework/Classes/RTCVideoRendererAdapter.mm

 /*
  *  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 "RTCVideoRendererAdapter+Private.h"
 
 #import "RTCVideoFrame+Private.h"
 
 #include <memory>
 
 #include "webrtc/media/engine/webrtcvideoframe.h"
 
 namespace webrtc {
 
 class VideoRendererAdapter
     : public rtc::VideoSinkInterface<cricket::VideoFrame> {
  public:
   VideoRendererAdapter(RTCVideoRendererAdapter* adapter) {
     adapter_ = adapter;
     size_ = CGSizeZero;
   }
 
   void OnFrame(const cricket::VideoFrame& nativeVideoFrame) override {
-    RTCVideoFrame *videoFrame = nil;
-    // Rotation of native handles is unsupported right now. Convert to CPU
-    // I420 buffer for rotation before calling the rotation method otherwise
-    // it will hit a DCHECK.
-    if (nativeVideoFrame.rotation() != webrtc::kVideoRotation_0 &&
-        nativeVideoFrame.video_frame_buffer()->native_handle()) {
-      rtc::scoped_refptr<webrtc::VideoFrameBuffer> i420Buffer =
-          nativeVideoFrame.video_frame_buffer()->NativeToI420Buffer();
-      std::unique_ptr<cricket::VideoFrame> cpuFrame(
-          new cricket::WebRtcVideoFrame(i420Buffer, nativeVideoFrame.rotation(),
-                                        nativeVideoFrame.timestamp_us(),
-                                        nativeVideoFrame.transport_frame_id()));
-      const cricket::VideoFrame *rotatedFrame =
-          cpuFrame->GetCopyWithRotationApplied();
-      videoFrame = [[RTCVideoFrame alloc] initWithNativeFrame:rotatedFrame];
-    } else {
-      const cricket::VideoFrame *rotatedFrame =
-          nativeVideoFrame.GetCopyWithRotationApplied();
-      videoFrame = [[RTCVideoFrame alloc] initWithNativeFrame:rotatedFrame];
-    }
-    CGSize current_size = CGSizeMake(videoFrame.width, videoFrame.height);
+    RTCVideoFrame* videoFrame = [[RTCVideoFrame alloc]
+        initWithVideoBuffer:nativeVideoFrame.video_frame_buffer()
+                   rotation:nativeVideoFrame.rotation()
+                timeStampNs:nativeVideoFrame.GetTimeStamp()];
+    CGSize current_size = (videoFrame.rotation % 180 == 0)
+                              ? CGSizeMake(videoFrame.width, videoFrame.height)
+                              : CGSizeMake(videoFrame.height, videoFrame.width);
+
     if (!CGSizeEqualToSize(size_, current_size)) {
       size_ = current_size;
       [adapter_.videoRenderer setSize:size_];
     }
     [adapter_.videoRenderer renderFrame:videoFrame];
   }
 
  private:
   __weak RTCVideoRendererAdapter *adapter_;
   CGSize size_;
@@ skipping 13 matching lines @@
     _adapter.reset(new webrtc::VideoRendererAdapter(self));
   }
   return self;
 }
 
 - (rtc::VideoSinkInterface<cricket::VideoFrame> *)nativeVideoRenderer {
   return _adapter.get();
 }
 
 @end