LetterboxPlane    149 media/base/video_util.cc   LetterboxPlane(frame, VideoFrame::kYPlane, view_area, 0x00);
LetterboxPlane    154 media/base/video_util.cc   LetterboxPlane(frame, VideoFrame::kUPlane, half_view_area, 0x80);
LetterboxPlane    155 media/base/video_util.cc   LetterboxPlane(frame, VideoFrame::kVPlane, half_view_area, 0x80);