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+/*
+ *  Copyright (c) 2011 The LibYuv 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.
+ */
+
+/*
+* Common definitions for video, including fourcc and VideoFormat
+*/
+
+
+#ifndef LIBYUV_SOURCE_VIDEO_COMMON_H_
+#define LIBYUV_SOURCE_VIDEO_COMMON_H_
+
+#include <string>
+
+#include "libyuv/basic_types.h"
+
+namespace libyuv {
+
+//////////////////////////////////////////////////////////////////////////////
+// Definition of fourcc.
+//////////////////////////////////////////////////////////////////////////////
+// Convert four characters to a fourcc code.
+// Needs to be a macro otherwise the OS X compiler complains when the kFormat*
+// constants are used in a switch.
+#define FOURCC(a, b, c, d) (\
+    (static_cast<uint32>(a)) | (static_cast<uint32>(b) << 8) | \
+    (static_cast<uint32>(c) << 16) | (static_cast<uint32>(d) << 24))
+
+// Some good pages discussing FourCC codes:
+//   http://developer.apple.com/quicktime/icefloe/dispatch020.html
+//   http://www.fourcc.org/yuv.php
+enum FourCC {
+  // Canonical fourcc codes used in our code.
+  FOURCC_I420 = FOURCC('I', '4', '2', '0'),
+  FOURCC_YV12 = FOURCC('Y', 'V', '1', '2'),
+  FOURCC_YUY2 = FOURCC('Y', 'U', 'Y', '2'),
+  FOURCC_UYVY = FOURCC('U', 'Y', 'V', 'Y'),
+  FOURCC_M420 = FOURCC('M', '4', '2', '0'),
+  FOURCC_24BG = FOURCC('2', '4', 'B', 'G'),
+  FOURCC_ABGR = FOURCC('A', 'B', 'G', 'R'),
+  FOURCC_BGRA = FOURCC('B', 'G', 'R', 'A'),
+  FOURCC_ARGB = FOURCC('A', 'R', 'G', 'B'),
+  FOURCC_MJPG = FOURCC('M', 'J', 'P', 'G'),
+  FOURCC_RAW  = FOURCC('r', 'a', 'w', ' '),
+  FOURCC_NV21 = FOURCC('N', 'V', '2', '1'),
+  FOURCC_NV12 = FOURCC('N', 'V', '1', '2'),
+  // Next four are Bayer RGB formats. The four characters define the order of
+  // the colours in each 2x2 pixel grid, going left-to-right and top-to-bottom.
+  FOURCC_RGGB = FOURCC('R', 'G', 'G', 'B'),
+  FOURCC_BGGR = FOURCC('B', 'G', 'G', 'R'),
+  FOURCC_GRBG = FOURCC('G', 'R', 'B', 'G'),
+  FOURCC_GBRG = FOURCC('G', 'B', 'R', 'G'),
+
+  // Aliases for canonical fourcc codes, replaced with their canonical
+  // equivalents by CanonicalFourCC().
+  FOURCC_IYUV = FOURCC('I', 'Y', 'U', 'V'),  // Alias for I420
+  FOURCC_YU12 = FOURCC('Y', 'U', '1', '2'),  // Alias for I420
+  FOURCC_YUYV = FOURCC('Y', 'U', 'Y', 'V'),  // Alias for YUY2
+  FOURCC_YUVS = FOURCC('y', 'u', 'v', 's'),  // Alias for YUY2 on Mac
+  FOURCC_HDYC = FOURCC('H', 'D', 'Y', 'C'),  // Alias for UYVY
+  FOURCC_2VUY = FOURCC('2', 'v', 'u', 'y'),  // Alias for UYVY
+  FOURCC_JPEG = FOURCC('J', 'P', 'E', 'G'),  // Alias for MJPG
+  FOURCC_BA81 = FOURCC('B', 'A', '8', '1'),  // Alias for BGGR
+  FOURCC_RGB3 = FOURCC('R', 'G', 'B', '3'),  // Alias for RAW
+  FOURCC_BGR3 = FOURCC('B', 'G', 'R', '3'),  // Alias for 24BG
+
+  // Match any fourcc.
+  FOURCC_ANY  = 0xFFFFFFFF,
+};
+
+// Converts fourcc aliases into canonical ones.
+uint32 CanonicalFourCC(uint32 fourcc);
+
+}  // namespace libyuv
+
+#endif  // LIBYUV_SOURCE_VIDEO_COMMON_H_