Add PIXEL_FORMAT_I422.

media/base/video_types.h

Index: media/base/video_types.h
diff --git a/media/base/video_types.h b/media/base/video_types.h
index 734a133206c60bf4d7fbb95518a695ddb443c604..728bd72aa22eac1544398fdc794775589493ed2a 100644
--- a/media/base/video_types.h
+++ b/media/base/video_types.h
@@ -61,9 +61,12 @@ enum VideoPixelFormat {
   PIXEL_FORMAT_Y8 = 25,   // single 8bpp plane.
   PIXEL_FORMAT_Y16 = 26,  // single 16bpp plane.
 
+  PIXEL_FORMAT_I422 =

[wuchengli, 2016/12/14 08:16:53]

I prefer PIXEL_FORMAT_YU16 to be consistent with PIXEL_FORMAT_YV16. Let's see
what media OWNER think about the naming.

[jcliang, 2016/12/14 08:25:41]

I followed the naming of libyuv which lists YU16 as an alias to I422. Not sure
what the best naming is here...

+      27,  // 16bpp YUV planar 1x1 Y, 2x2 UV samples, a.k.a. YU16.

[wuchengli, 2016/12/14 08:16:53]

This should be 2x1 UV samples.

[jcliang, 2016/12/14 08:25:41]

Done.

+
   // Please update UMA histogram enumeration when adding new formats here.
   PIXEL_FORMAT_MAX =
-      PIXEL_FORMAT_Y16,  // Must always be equal to largest entry logged.
+      PIXEL_FORMAT_I422,  // Must always be equal to largest entry logged.
 };
 
 // Color space or color range used for the pixels.