Current File : //usr/include/OpenEXR/ImfFramesPerSecond.h
///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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///////////////////////////////////////////////////////////////////////////
#ifndef INCLUDED_IMF_FRAMES_PER_SECOND_H
#define INCLUDED_IMF_FRAMES_PER_SECOND_H
//-----------------------------------------------------------------------------
//
// Convenience functions related to the framesPerSecond attribute
//
// Functions that return the exact values for commonly used frame rates:
//
// name frames per second
//
// fps_23_976() 23.976023...
// fps_24() 24.0 35mm film frames
// fps_25() 25.0 PAL video frames
// fps_29_97() 29.970029... NTSC video frames
// fps_30() 30.0 60Hz HDTV frames
// fps_47_952() 47.952047...
// fps_48() 48.0
// fps_50() 50.0 PAL video fields
// fps_59_94() 59.940059... NTSC video fields
// fps_60() 60.0 60Hz HDTV fields
//
// Functions that try to convert inexact frame rates into exact ones:
//
// Given a frame rate, fps, that is close to one of the pre-defined
// frame rates fps_23_976(), fps_29_97(), fps_47_952() or fps_59_94(),
// guessExactFps(fps) returns the corresponding pre-defined frame
// rate. If fps is not close to one of the pre-defined frame rates,
// then guessExactFps(fps) returns Rational(fps).
//
//-----------------------------------------------------------------------------
#include "ImfRational.h"
#include "ImfNamespace.h"
#include "ImfExport.h"
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
inline Rational fps_23_976 () {return Rational (24000, 1001);}
inline Rational fps_24 () {return Rational (24, 1);}
inline Rational fps_25 () {return Rational (25, 1);}
inline Rational fps_29_97 () {return Rational (30000, 1001);}
inline Rational fps_30 () {return Rational (30, 1);}
inline Rational fps_47_952 () {return Rational (48000, 1001);}
inline Rational fps_48 () {return Rational (48, 1);}
inline Rational fps_50 () {return Rational (50, 1);}
inline Rational fps_59_94 () {return Rational (60000, 1001);}
inline Rational fps_60 () {return Rational (60, 1);}
IMF_EXPORT Rational guessExactFps (double fps);
IMF_EXPORT Rational guessExactFps (const Rational &fps);
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
#endif
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