1 /////////////////////////////////////////////////////////////////////////// 2 // 3 // Copyright (c) 2006, Industrial Light & Magic, a division of Lucas 4 // Digital Ltd. LLC 5 // 6 // All rights reserved. 7 // 8 // Redistribution and use in source and binary forms, with or without 9 // modification, are permitted provided that the following conditions are 10 // met: 11 // * Redistributions of source code must retain the above copyright 12 // notice, this list of conditions and the following disclaimer. 13 // * Redistributions in binary form must reproduce the above 14 // copyright notice, this list of conditions and the following disclaimer 15 // in the documentation and/or other materials provided with the 16 // distribution. 17 // * Neither the name of Industrial Light & Magic nor the names of 18 // its contributors may be used to endorse or promote products derived 19 // from this software without specific prior written permission. 20 // 21 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 // 33 /////////////////////////////////////////////////////////////////////////// 34 35 36 #ifndef INCLUDED_IMF_FRAMES_PER_SECOND_H 37 #define INCLUDED_IMF_FRAMES_PER_SECOND_H 38 39 //----------------------------------------------------------------------------- 40 // 41 // Convenience functions related to the framesPerSecond attribute 42 // 43 // Functions that return the exact values for commonly used frame rates: 44 // 45 // name frames per second 46 // 47 // fps_23_976() 23.976023... 48 // fps_24() 24.0 35mm film frames 49 // fps_25() 25.0 PAL video frames 50 // fps_29_97() 29.970029... NTSC video frames 51 // fps_30() 30.0 60Hz HDTV frames 52 // fps_47_952() 47.952047... 53 // fps_48() 48.0 54 // fps_50() 50.0 PAL video fields 55 // fps_59_94() 59.940059... NTSC video fields 56 // fps_60() 60.0 60Hz HDTV fields 57 // 58 // Functions that try to convert inexact frame rates into exact ones: 59 // 60 // Given a frame rate, fps, that is close to one of the pre-defined 61 // frame rates fps_23_976(), fps_29_97(), fps_47_952() or fps_59_94(), 62 // guessExactFps(fps) returns the corresponding pre-defined frame 63 // rate. If fps is not close to one of the pre-defined frame rates, 64 // then guessExactFps(fps) returns Rational(fps). 65 // 66 //----------------------------------------------------------------------------- 67 68 #include <ImfRational.h> 69 70 namespace Imf { 71 72 inline Rational fps_23_976 () {return Rational (24000, 1001);} 73 inline Rational fps_24 () {return Rational (24, 1);} 74 inline Rational fps_25 () {return Rational (25, 1);} 75 inline Rational fps_29_97 () {return Rational (30000, 1001);} 76 inline Rational fps_30 () {return Rational (30, 1);} 77 inline Rational fps_47_952 () {return Rational (48000, 1001);} 78 inline Rational fps_48 () {return Rational (48, 1);} 79 inline Rational fps_50 () {return Rational (50, 1);} 80 inline Rational fps_59_94 () {return Rational (60000, 1001);} 81 inline Rational fps_60 () {return Rational (60, 1);} 82 83 Rational guessExactFps (double fps); 84 Rational guessExactFps (const Rational &fps); 85 86 } // namespace Imf 87 88 #endif 89
