Rotate frames according to camera orientation

media/capture/video/linux/video_capture_device_chromeos.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/capture/video/linux/video_capture_device_chromeos.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "ui/display/display.h"
 #include "ui/display/display_observer.h"
 #include "ui/display/screen.h"
 
 namespace media {
 
 namespace {
 
-base::LazyInstance<CameraFacingChromeOS>::Leaky g_camera_facing_ =
+base::LazyInstance<CameraConfigChromeOS>::Leaky g_camera_config_ =
     LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 // This is a delegate class used to transfer Display change events from the UI
 // thread to the media thread.
 class VideoCaptureDeviceChromeOS::ScreenObserverDelegate
     : public display::DisplayObserver,
       public base::RefCountedThreadSafe<ScreenObserverDelegate> {
  public:
@@ skipping 68 matching lines @@
   DISALLOW_IMPLICIT_CONSTRUCTORS(ScreenObserverDelegate);
 };
 
 VideoCaptureDeviceChromeOS::VideoCaptureDeviceChromeOS(
     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
     const VideoCaptureDeviceDescriptor& device_descriptor)
     : VideoCaptureDeviceLinux(device_descriptor),
       screen_observer_delegate_(
           new ScreenObserverDelegate(this, ui_task_runner)),
       lens_facing_(
-          g_camera_facing_.Get().GetCameraFacing(device_descriptor.device_id,
-                                                 device_descriptor.model_id)) {}
+          g_camera_config_.Get().GetCameraFacing(device_descriptor.device_id,
+                                                 device_descriptor.model_id)),
+      camera_orientation_(
+          g_camera_config_.Get().GetOrientation(device_descriptor.device_id,
+                                                device_descriptor.model_id)) {}
 
 VideoCaptureDeviceChromeOS::~VideoCaptureDeviceChromeOS() {
   screen_observer_delegate_->RemoveObserver();
 }
 
 void VideoCaptureDeviceChromeOS::SetRotation(int rotation) {
   // We assume external camera is facing the users. If not, the users can
   // rotate the camera manually by themselves.
   if (lens_facing_ == VideoFacingMode::MEDIA_VIDEO_FACING_ENVIRONMENT) {
     // Original frame when |rotation| = 0
@@ skipping 22 matching lines @@
     // |      ****   *       |
     // |    ***      *       |
     // |    ***      *       |
     // |      ****   *       |
     // |         ********    |
     // -----------------------
     //
     // Therefore, for back camera, we need to rotate (360 - |rotation|).
     rotation = (360 - rotation) % 360;
   }
+  // Take into account camera orientation w.r.t. the display.
+  rotation = (rotation + camera_orientation_) % 360;
   VideoCaptureDeviceLinux::SetRotation(rotation);
 }
 
 void VideoCaptureDeviceChromeOS::SetDisplayRotation(
     const display::Display& display) {
   if (display.IsInternal())
     SetRotation(display.rotation() * 90);
 }
 
 }  // namespace media