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FFmpeg/libavutil/cpu.c

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  1. /*

  2.  * This file is part of FFmpeg.

  3.  *

  4.  * FFmpeg is free software; you can redistribute it and/or

  5.  * modify it under the terms of the GNU Lesser General Public

  6.  * License as published by the Free Software Foundation; either

  7.  * version 2.1 of the License, or (at your option) any later version.

  8.  *

  9.  * FFmpeg is distributed in the hope that it will be useful,

  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  12.  * Lesser General Public License for more details.

  13.  *

  14.  * You should have received a copy of the GNU Lesser General Public

  15.  * License along with FFmpeg; if not, write to the Free Software

  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  17.  */

  18. 

  19. #include "cpu.h"

  20. #include "config.h"

  21. #include "opt.h"

  22. 

  23. #if HAVE_SCHED_GETAFFINITY

  24. #ifndef _GNU_SOURCE

  25. # define _GNU_SOURCE

  26. #endif

  27. #include <sched.h>

  28. #endif

  29. #if HAVE_GETPROCESSAFFINITYMASK

  30. #include <windows.h>

  31. #endif

  32. #if HAVE_SYSCTL

  33. #if HAVE_SYS_PARAM_H

  34. #include <sys/param.h>

  35. #endif

  36. #include <sys/types.h>

  37. #include <sys/param.h>

  38. #include <sys/sysctl.h>

  39. #endif

  40. #if HAVE_SYSCONF

  41. #include <unistd.h>

  42. #endif

  43. 

  44. static int flags, checked;

  45. 

  46. void av_force_cpu_flags(int arg){

  47.     flags   = arg;

  48.     checked = arg != -1;

  49. }

  50. 

  51. int av_get_cpu_flags(void)

  52. {

  53.     if (checked)

  54.         return flags;

  55. 

  56.     if (ARCH_ARM) flags = ff_get_cpu_flags_arm();

  57.     if (ARCH_PPC) flags = ff_get_cpu_flags_ppc();

  58.     if (ARCH_X86) flags = ff_get_cpu_flags_x86();

  59. 

  60.     checked = 1;

  61.     return flags;

  62. }

  63. 

  64. void av_set_cpu_flags_mask(int mask)

  65. {

  66.     checked       = 0;

  67.     flags         = av_get_cpu_flags() & mask;

  68.     checked       = 1;

  69. }

  70. 

  71. int av_parse_cpu_flags(const char *s)

  72. {

  73. #define CPUFLAG_MMXEXT   (AV_CPU_FLAG_MMX      | AV_CPU_FLAG_MMXEXT | AV_CPU_FLAG_CMOV)

  74. #define CPUFLAG_3DNOW    (AV_CPU_FLAG_3DNOW    | AV_CPU_FLAG_MMX)

  75. #define CPUFLAG_3DNOWEXT (AV_CPU_FLAG_3DNOWEXT | CPUFLAG_3DNOW)

  76. #define CPUFLAG_SSE      (AV_CPU_FLAG_SSE      | CPUFLAG_MMXEXT)

  77. #define CPUFLAG_SSE2     (AV_CPU_FLAG_SSE2     | CPUFLAG_SSE)

  78. #define CPUFLAG_SSE2SLOW (AV_CPU_FLAG_SSE2SLOW | CPUFLAG_SSE2)

  79. #define CPUFLAG_SSE3     (AV_CPU_FLAG_SSE3     | CPUFLAG_SSE2)

  80. #define CPUFLAG_SSE3SLOW (AV_CPU_FLAG_SSE3SLOW | CPUFLAG_SSE3)

  81. #define CPUFLAG_SSSE3    (AV_CPU_FLAG_SSSE3    | CPUFLAG_SSE3)

  82. #define CPUFLAG_SSE4     (AV_CPU_FLAG_SSE4     | CPUFLAG_SSSE3)

  83. #define CPUFLAG_SSE42    (AV_CPU_FLAG_SSE42    | CPUFLAG_SSE4)

  84. #define CPUFLAG_AVX      (AV_CPU_FLAG_AVX      | CPUFLAG_SSE42)

  85. #define CPUFLAG_XOP      (AV_CPU_FLAG_XOP      | CPUFLAG_AVX)

  86. #define CPUFLAG_FMA4     (AV_CPU_FLAG_FMA4     | CPUFLAG_AVX)

  87.     static const AVOption cpuflags_opts[] = {

  88.         { "flags"   , NULL, 0, AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT64_MIN, INT64_MAX, .unit = "flags" },

  89. #if   ARCH_PPC

  90.         { "altivec" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ALTIVEC  },    .unit = "flags" },

  91. #elif ARCH_X86

  92.         { "mmx"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX      },    .unit = "flags" },

  93.         { "mmxext"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_MMXEXT       },    .unit = "flags" },

  94.         { "sse"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE          },    .unit = "flags" },

  95.         { "sse2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE2         },    .unit = "flags" },

  96.         { "sse2slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE2SLOW     },    .unit = "flags" },

  97.         { "sse3"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE3         },    .unit = "flags" },

  98.         { "sse3slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE3SLOW     },    .unit = "flags" },

  99.         { "ssse3"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSSE3        },    .unit = "flags" },

  100.         { "atom"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ATOM     },    .unit = "flags" },

  101.         { "sse4.1"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE4         },    .unit = "flags" },

  102.         { "sse4.2"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE42        },    .unit = "flags" },

  103.         { "avx"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX          },    .unit = "flags" },

  104.         { "xop"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_XOP          },    .unit = "flags" },

  105.         { "fma4"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA4         },    .unit = "flags" },

  106.         { "3dnow"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOW        },    .unit = "flags" },

  107.         { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOWEXT     },    .unit = "flags" },

  108.         { "cmov",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV     },    .unit = "flags" },

  109. #elif ARCH_ARM

  110.         { "armv5te",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV5TE  },    .unit = "flags" },

  111.         { "armv6",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6    },    .unit = "flags" },

  112.         { "armv6t2",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6T2  },    .unit = "flags" },

  113.         { "vfp",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP      },    .unit = "flags" },

  114.         { "vfpv3",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFPV3    },    .unit = "flags" },

  115.         { "neon",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON     },    .unit = "flags" },

  116. #endif

  117.         { NULL },

  118.     };

  119.     static const AVClass class = {

  120.         .class_name = "cpuflags",

  121.         .item_name  = av_default_item_name,

  122.         .option     = cpuflags_opts,

  123.         .version    = LIBAVUTIL_VERSION_INT,

  124.     };

  125. 

  126.     int flags = 0, ret;

  127.     const AVClass *pclass = &class;

  128. 

  129.     if ((ret = av_opt_eval_flags(&pclass, &cpuflags_opts[0], s, &flags)) < 0)

  130.         return ret;

  131. 

  132.     return flags & INT_MAX;

  133. }

  134. 

  135. int av_parse_cpu_caps(unsigned *flags, const char *s)

  136. {

  137.         static const AVOption cpuflags_opts[] = {

  138.         { "flags"   , NULL, 0, AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT64_MIN, INT64_MAX, .unit = "flags" },

  139. #if   ARCH_PPC

  140.         { "altivec" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ALTIVEC  },    .unit = "flags" },

  141. #elif ARCH_X86

  142.         { "mmx"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX      },    .unit = "flags" },

  143.         { "mmx2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX2     },    .unit = "flags" },

  144.         { "mmxext"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX2     },    .unit = "flags" },

  145.         { "sse"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE      },    .unit = "flags" },

  146.         { "sse2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE2     },    .unit = "flags" },

  147.         { "sse2slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE2SLOW },    .unit = "flags" },

  148.         { "sse3"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE3     },    .unit = "flags" },

  149.         { "sse3slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE3SLOW },    .unit = "flags" },

  150.         { "ssse3"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSSE3    },    .unit = "flags" },

  151.         { "atom"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ATOM     },    .unit = "flags" },

  152.         { "sse4.1"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE4     },    .unit = "flags" },

  153.         { "sse4.2"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE42    },    .unit = "flags" },

  154.         { "avx"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX      },    .unit = "flags" },

  155.         { "xop"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_XOP      },    .unit = "flags" },

  156.         { "fma4"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_FMA4     },    .unit = "flags" },

  157.         { "3dnow"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOW    },    .unit = "flags" },

  158.         { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOWEXT },    .unit = "flags" },

  159.         { "cmov",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV     },    .unit = "flags" },

  160. 

  161. #define CPU_FLAG_P2 AV_CPU_FLAG_CMOV | AV_CPU_FLAG_MMX

  162. #define CPU_FLAG_P3 CPU_FLAG_P2 | AV_CPU_FLAG_MMX2 | AV_CPU_FLAG_SSE

  163. #define CPU_FLAG_P4 CPU_FLAG_P3| AV_CPU_FLAG_SSE2

  164.         { "pentium2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P2          },    .unit = "flags" },

  165.         { "pentium3", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P3          },    .unit = "flags" },

  166.         { "pentium4", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P4          },    .unit = "flags" },

  167. 

  168. #define CPU_FLAG_K62 AV_CPU_FLAG_MMX | AV_CPU_FLAG_3DNOW

  169. #define CPU_FLAG_ATHLON   CPU_FLAG_K62 | AV_CPU_FLAG_CMOV | AV_CPU_FLAG_3DNOWEXT | AV_CPU_FLAG_MMX2

  170. #define CPU_FLAG_ATHLONXP CPU_FLAG_ATHLON | AV_CPU_FLAG_SSE

  171. #define CPU_FLAG_K8  CPU_FLAG_ATHLONXP | AV_CPU_FLAG_SSE2

  172.         { "k6",       NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX      },    .unit = "flags" },

  173.         { "k62",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_K62         },    .unit = "flags" },

  174.         { "athlon",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_ATHLON      },    .unit = "flags" },

  175.         { "athlonxp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_ATHLONXP    },    .unit = "flags" },

  176.         { "k8",       NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_K8          },    .unit = "flags" },

  177. #elif ARCH_ARM

  178.         { "armv5te",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV5TE  },    .unit = "flags" },

  179.         { "armv6",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6    },    .unit = "flags" },

  180.         { "armv6t2",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6T2  },    .unit = "flags" },

  181.         { "vfp",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP      },    .unit = "flags" },

  182.         { "vfpv3",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFPV3    },    .unit = "flags" },

  183.         { "neon",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON     },    .unit = "flags" },

  184. #endif

  185.         { NULL },

  186.     };

  187.     static const AVClass class = {

  188.         .class_name = "cpuflags",

  189.         .item_name  = av_default_item_name,

  190.         .option     = cpuflags_opts,

  191.         .version    = LIBAVUTIL_VERSION_INT,

  192.     };

  193.     const AVClass *pclass = &class;

  194. 

  195.     return av_opt_eval_flags(&pclass, &cpuflags_opts[0], s, flags);

  196. }

  197. 

  198. int av_cpu_count(void)

  199. {

  200.     int ret, nb_cpus = 1;

  201. #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)

  202.     cpu_set_t cpuset;

  203. 

  204.     CPU_ZERO(&cpuset);

  205. 

  206.     ret = sched_getaffinity(0, sizeof(cpuset), &cpuset);

  207.     if (!ret) {

  208.         nb_cpus = CPU_COUNT(&cpuset);

  209.     }

  210. #elif HAVE_GETPROCESSAFFINITYMASK

  211.     DWORD_PTR proc_aff, sys_aff;

  212.     ret = GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff);

  213.     if (ret)

  214.         nb_cpus = av_popcount64(proc_aff);

  215. #elif HAVE_SYSCTL && defined(HW_NCPU)

  216.     int mib[2] = { CTL_HW, HW_NCPU };

  217.     size_t len = sizeof(nb_cpus);

  218. 

  219.     ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0);

  220.     if (ret == -1)

  221.         nb_cpus = 0;

  222. #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)

  223.     nb_cpus = sysconf(_SC_NPROC_ONLN);

  224. #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)

  225.     nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);

  226. #endif

  227. 

  228.     return nb_cpus;

  229. }

  230. 

  231. #ifdef TEST

  232. 

  233. #include <stdio.h>

  234. 

  235. static const struct {

  236.     int flag;

  237.     const char *name;

  238. } cpu_flag_tab[] = {

  239. #if   ARCH_ARM

  240.     { AV_CPU_FLAG_ARMV5TE,   "armv5te"    },

  241.     { AV_CPU_FLAG_ARMV6,     "armv6"      },

  242.     { AV_CPU_FLAG_ARMV6T2,   "armv6t2"    },

  243.     { AV_CPU_FLAG_VFP,       "vfp"        },

  244.     { AV_CPU_FLAG_VFPV3,     "vfpv3"      },

  245.     { AV_CPU_FLAG_NEON,      "neon"       },

  246. #elif ARCH_PPC

  247.     { AV_CPU_FLAG_ALTIVEC,   "altivec"    },

  248. #elif ARCH_X86

  249.     { AV_CPU_FLAG_MMX,       "mmx"        },

  250.     { AV_CPU_FLAG_MMXEXT,    "mmxext"     },

  251.     { AV_CPU_FLAG_SSE,       "sse"        },

  252.     { AV_CPU_FLAG_SSE2,      "sse2"       },

  253.     { AV_CPU_FLAG_SSE2SLOW,  "sse2(slow)" },

  254.     { AV_CPU_FLAG_SSE3,      "sse3"       },

  255.     { AV_CPU_FLAG_SSE3SLOW,  "sse3(slow)" },

  256.     { AV_CPU_FLAG_SSSE3,     "ssse3"      },

  257.     { AV_CPU_FLAG_ATOM,      "atom"       },

  258.     { AV_CPU_FLAG_SSE4,      "sse4.1"     },

  259.     { AV_CPU_FLAG_SSE42,     "sse4.2"     },

  260.     { AV_CPU_FLAG_AVX,       "avx"        },

  261.     { AV_CPU_FLAG_XOP,       "xop"        },

  262.     { AV_CPU_FLAG_FMA4,      "fma4"       },

  263.     { AV_CPU_FLAG_3DNOW,     "3dnow"      },

  264.     { AV_CPU_FLAG_3DNOWEXT,  "3dnowext"   },

  265.     { AV_CPU_FLAG_CMOV,      "cmov"       },

  266. #endif

  267.     { 0 }

  268. };

  269. 

  270. int main(void)

  271. {

  272.     int cpu_flags = av_get_cpu_flags();

  273.     int i;

  274. 

  275.     printf("cpu_flags = 0x%08X\n", cpu_flags);

  276.     printf("cpu_flags =");

  277.     for (i = 0; cpu_flag_tab[i].flag; i++)

  278.         if (cpu_flags & cpu_flag_tab[i].flag)

  279.             printf(" %s", cpu_flag_tab[i].name);

  280.     printf("\n");

  281. 

  282.     return 0;

  283. }

  284. 

  285. #endif