Media Capture Depth Stream Extensions API: focal length and depth range.

media/capture/video/video_capture_device_descriptor.h

Index: media/capture/video/video_capture_device_descriptor.h
diff --git a/media/capture/video/video_capture_device_descriptor.h b/media/capture/video/video_capture_device_descriptor.h
index ea2331a17bc4b9b2ad76ddb24c3fdabb2362a113..f22e9b629eec9cd910f073859ab672f49e1fc8db 100644
--- a/media/capture/video/video_capture_device_descriptor.h
+++ b/media/capture/video/video_capture_device_descriptor.h
@@ -8,6 +8,7 @@
 #include <string>
 #include <vector>
 
+#include "base/memory/ref_counted.h"
 #include "media/capture/capture_export.h"
 
 namespace media {
@@ -82,6 +83,26 @@ struct CAPTURE_EXPORT VideoCaptureDeviceDescriptor {
 
   VideoCaptureApi capture_api;
   VideoCaptureTransportType transport_type;
+
+  // Contains camera calibration parameters.
+  // These parameters apply to both RGB and depth video devices.  See also
+  // https://w3c.github.io/mediacapture-depth/#mediatracksettings-dictionary
+  // TODO(aleksandar.stojiljkovic): Add principal point and camera distortion
+  // model and coefficients.  See also https://crbug.com/616098
+  struct CameraCalibration
+      : public base::RefCountedThreadSafe<CameraCalibration> {
+    double focal_length_x = 0.0;
+    double focal_length_y = 0.0;
+    // depth near and far are used only for depth cameras.
+    double depth_near = 0.0;
+    double depth_far = 0.0;
+
+   private:
+    friend class base::RefCountedThreadSafe<CameraCalibration>;

[mcasas, 2017/01/05 01:09:32]

I fail to see why should CameraCalibration be ref counted, 
since it's just a POD.

[aleksandar.stojiljkovic, 2017/01/09 18:47:01]

Done.
Didn't know better. As I learned about it here; base::Optional looks like a
proper way.

+    ~CameraCalibration() {}
+  };
+
+  scoped_refptr<CameraCalibration> camera_calibration = nullptr;
 };
 
 using VideoCaptureDeviceDescriptors = std::vector<VideoCaptureDeviceDescriptor>;