| /////////////////////////////////////////////////////////////////////////// |
| // |
| // 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 |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| // |
| /////////////////////////////////////////////////////////////////////////// |
| |
| |
| #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 |
