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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
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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>

namespace Imf {

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);}

Rational    guessExactFps (double fps);
Rational    guessExactFps (const Rational &fps);

} // namespace Imf

#endif

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