102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
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//
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// SPDX-License-Identifier: BSD-3-Clause
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// Copyright (c) Contributors to the OpenEXR Project.
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//
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#ifndef INCLUDED_IMF_FRAMES_PER_SECOND_H
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#define INCLUDED_IMF_FRAMES_PER_SECOND_H
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//-----------------------------------------------------------------------------
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//
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// Convenience functions related to the framesPerSecond attribute
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//
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// Functions that return the exact values for commonly used frame rates:
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//
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// name frames per second
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//
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// fps_23_976() 23.976023...
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// fps_24() 24.0 35mm film frames
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// fps_25() 25.0 PAL video frames
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// fps_29_97() 29.970029... NTSC video frames
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// fps_30() 30.0 60Hz HDTV frames
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// fps_47_952() 47.952047...
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// fps_48() 48.0
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// fps_50() 50.0 PAL video fields
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// fps_59_94() 59.940059... NTSC video fields
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// fps_60() 60.0 60Hz HDTV fields
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//
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// Functions that try to convert inexact frame rates into exact ones:
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//
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// Given a frame rate, fps, that is close to one of the pre-defined
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// frame rates fps_23_976(), fps_29_97(), fps_47_952() or fps_59_94(),
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// guessExactFps(fps) returns the corresponding pre-defined frame
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// rate. If fps is not close to one of the pre-defined frame rates,
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// then guessExactFps(fps) returns Rational(fps).
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//
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//-----------------------------------------------------------------------------
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#include "ImfExport.h"
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#include "ImfNamespace.h"
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#include "ImfRational.h"
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OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
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inline Rational
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fps_23_976 ()
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{
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return Rational (24000, 1001);
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}
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inline Rational
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fps_24 ()
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{
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return Rational (24, 1);
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}
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inline Rational
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fps_25 ()
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{
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return Rational (25, 1);
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}
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inline Rational
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fps_29_97 ()
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{
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return Rational (30000, 1001);
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}
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inline Rational
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fps_30 ()
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{
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return Rational (30, 1);
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}
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inline Rational
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fps_47_952 ()
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{
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return Rational (48000, 1001);
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}
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inline Rational
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fps_48 ()
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{
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return Rational (48, 1);
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}
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inline Rational
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fps_50 ()
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{
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return Rational (50, 1);
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}
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inline Rational
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fps_59_94 ()
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{
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return Rational (60000, 1001);
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}
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inline Rational
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fps_60 ()
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{
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return Rational (60, 1);
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}
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IMF_EXPORT Rational guessExactFps (double fps);
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IMF_EXPORT Rational guessExactFps (const Rational& fps);
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OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
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#endif
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