chromium/third_party/libyuv/include/libyuv/video_common.h

/*
 *  Copyright 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 INCLUDE_LIBYUV_VIDEO_COMMON_H_
#define INCLUDE_LIBYUV_VIDEO_COMMON_H_

#include "libyuv/basic_types.h"

#ifdef __cplusplus
namespace libyuv {
extern "C" {
#endif

//////////////////////////////////////////////////////////////////////////////
// Definition of FourCC codes
//////////////////////////////////////////////////////////////////////////////

// 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.
#ifdef __cplusplus
#define FOURCC(a, b, c, d) …
#else
#define FOURCC …
#endif

// Some pages discussing FourCC codes:
//   http://www.fourcc.org/yuv.php
//   http://v4l2spec.bytesex.org/spec/book1.htm
//   http://developer.apple.com/quicktime/icefloe/dispatch020.html
//   http://msdn.microsoft.com/library/windows/desktop/dd206750.aspx#nv12
//   http://people.xiph.org/~xiphmont/containers/nut/nut4cc.txt

// FourCC codes grouped according to implementation efficiency.
// Primary formats should convert in 1 efficient step.
// Secondary formats are converted in 2 steps.
// Auxilliary formats call primary converters.
enum FourCC { … };

enum FourCCBpp { … };

// Converts fourcc aliases into canonical ones.
LIBYUV_API uint32_t CanonicalFourCC(uint32_t fourcc);

#ifdef __cplusplus
}  // extern "C"
}  // namespace libyuv
#endif

#endif  // INCLUDE_LIBYUV_VIDEO_COMMON_H_