OpenShot Library | libopenshot  0.2.2
OpenMPUtilities.h
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1 /**
2  * @file
3  * @brief Header file for OpenMPUtilities (set some common macros)
4  * @author Jonathan Thomas <jonathan@openshot.org>
5  *
6  * @section LICENSE
7  *
8  * Copyright (c) 2008-2014 OpenShot Studios, LLC
9  * <http://www.openshotstudios.com/>. This file is part of
10  * OpenShot Library (libopenshot), an open-source project dedicated to
11  * delivering high quality video editing and animation solutions to the
12  * world. For more information visit <http://www.openshot.org/>.
13  *
14  * OpenShot Library (libopenshot) is free software: you can redistribute it
15  * and/or modify it under the terms of the GNU Lesser General Public License
16  * as published by the Free Software Foundation, either version 3 of the
17  * License, or (at your option) any later version.
18  *
19  * OpenShot Library (libopenshot) is distributed in the hope that it will be
20  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22  * GNU Lesser General Public License for more details.
23  *
24  * You should have received a copy of the GNU Lesser General Public License
25  * along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
26  */
27 
28 #ifndef OPENSHOT_OPENMP_UTILITIES_H
29 #define OPENSHOT_OPENMP_UTILITIES_H
30 
31 #include <omp.h>
32 #include <stdlib.h>
33 #include <string.h>
34 
35 // Calculate the # of OpenMP and FFmpeg Threads to allow. We are limiting both
36 // of these based on our own performance tests (more is not always better).
37 #define OPEN_MP_NUM_PROCESSORS (min(omp_get_num_procs(), 6))
38 #define FF_NUM_PROCESSORS (min(omp_get_num_procs(), 12))
39 
40 using namespace std;
41 
42 namespace openshot {
43 
44  // Check if OS2_OMP_THREADS environment variable is present, and return
45  // if multiple threads should be used with OMP
46  static bool IsOMPEnabled() {
47  char* OS2_OMP_THREADS = getenv("OS2_OMP_THREADS");
48  if (OS2_OMP_THREADS != NULL && strcmp(OS2_OMP_THREADS, "0") == 0)
49  return false;
50  else
51  return true;
52  }
53 
54 }
55 
56 #endif
This namespace is the default namespace for all code in the openshot library.