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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 <stddef.h>

  20. #include <stdint.h>

  21. #include <stdatomic.h>

  22. 

  23. #include "attributes.h"

  24. #include "cpu.h"

  25. #include "cpu_internal.h"

  26. #include "config.h"

  27. #include "opt.h"

  28. #include "common.h"

  29. 

  30. #if HAVE_SCHED_GETAFFINITY

  31. #ifndef _GNU_SOURCE

  32. # define _GNU_SOURCE

  33. #endif

  34. #include <sched.h>

  35. #endif

  36. #if HAVE_GETPROCESSAFFINITYMASK || HAVE_WINRT

  37. #include <windows.h>

  38. #endif

  39. #if HAVE_SYSCTL

  40. #if HAVE_SYS_PARAM_H

  41. #include <sys/param.h>

  42. #endif

  43. #include <sys/types.h>

  44. #include <sys/sysctl.h>

  45. #endif

  46. #if HAVE_UNISTD_H

  47. #include <unistd.h>

  48. #endif

  49. 

  50. static atomic_int cpu_flags = ATOMIC_VAR_INIT(-1);

  51. 

  52. static int get_cpu_flags(void)

  53. {

  54.     if (ARCH_MIPS)

  55.         return ff_get_cpu_flags_mips();

  56.     if (ARCH_AARCH64)

  57.         return ff_get_cpu_flags_aarch64();

  58.     if (ARCH_ARM)

  59.         return ff_get_cpu_flags_arm();

  60.     if (ARCH_PPC)

  61.         return ff_get_cpu_flags_ppc();

  62.     if (ARCH_X86)

  63.         return ff_get_cpu_flags_x86();

  64.     return 0;

  65. }

  66. 

  67. void av_force_cpu_flags(int arg){

  68.     if (ARCH_X86 &&

  69.            (arg & ( AV_CPU_FLAG_3DNOW    |

  70.                     AV_CPU_FLAG_3DNOWEXT |

  71.                     AV_CPU_FLAG_MMXEXT   |

  72.                     AV_CPU_FLAG_SSE      |

  73.                     AV_CPU_FLAG_SSE2     |

  74.                     AV_CPU_FLAG_SSE2SLOW |

  75.                     AV_CPU_FLAG_SSE3     |

  76.                     AV_CPU_FLAG_SSE3SLOW |

  77.                     AV_CPU_FLAG_SSSE3    |

  78.                     AV_CPU_FLAG_SSE4     |

  79.                     AV_CPU_FLAG_SSE42    |

  80.                     AV_CPU_FLAG_AVX      |

  81.                     AV_CPU_FLAG_AVXSLOW  |

  82.                     AV_CPU_FLAG_XOP      |

  83.                     AV_CPU_FLAG_FMA3     |

  84.                     AV_CPU_FLAG_FMA4     |

  85.                     AV_CPU_FLAG_AVX2     |

  86.                     AV_CPU_FLAG_AVX512   ))

  87.         && !(arg & AV_CPU_FLAG_MMX)) {

  88.         av_log(NULL, AV_LOG_WARNING, "MMX implied by specified flags\n");

  89.         arg |= AV_CPU_FLAG_MMX;

  90.     }

  91. 

  92.     atomic_store_explicit(&cpu_flags, arg, memory_order_relaxed);

  93. }

  94. 

  95. int av_get_cpu_flags(void)

  96. {

  97.     int flags = atomic_load_explicit(&cpu_flags, memory_order_relaxed);

  98.     if (flags == -1) {

  99.         flags = get_cpu_flags();

  100.         atomic_store_explicit(&cpu_flags, flags, memory_order_relaxed);

  101.     }

  102.     return flags;

  103. }

  104. 

  105. void av_set_cpu_flags_mask(int mask)

  106. {

  107.     atomic_store_explicit(&cpu_flags, get_cpu_flags() & mask,

  108.                           memory_order_relaxed);

  109. }

  110. 

  111. int av_parse_cpu_flags(const char *s)

  112. {

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

  114. #define CPUFLAG_3DNOW    (AV_CPU_FLAG_3DNOW    | AV_CPU_FLAG_MMX)

  115. #define CPUFLAG_3DNOWEXT (AV_CPU_FLAG_3DNOWEXT | CPUFLAG_3DNOW)

  116. #define CPUFLAG_SSE      (AV_CPU_FLAG_SSE      | CPUFLAG_MMXEXT)

  117. #define CPUFLAG_SSE2     (AV_CPU_FLAG_SSE2     | CPUFLAG_SSE)

  118. #define CPUFLAG_SSE2SLOW (AV_CPU_FLAG_SSE2SLOW | CPUFLAG_SSE2)

  119. #define CPUFLAG_SSE3     (AV_CPU_FLAG_SSE3     | CPUFLAG_SSE2)

  120. #define CPUFLAG_SSE3SLOW (AV_CPU_FLAG_SSE3SLOW | CPUFLAG_SSE3)

  121. #define CPUFLAG_SSSE3    (AV_CPU_FLAG_SSSE3    | CPUFLAG_SSE3)

  122. #define CPUFLAG_SSE4     (AV_CPU_FLAG_SSE4     | CPUFLAG_SSSE3)

  123. #define CPUFLAG_SSE42    (AV_CPU_FLAG_SSE42    | CPUFLAG_SSE4)

  124. #define CPUFLAG_AVX      (AV_CPU_FLAG_AVX      | CPUFLAG_SSE42)

  125. #define CPUFLAG_AVXSLOW  (AV_CPU_FLAG_AVXSLOW  | CPUFLAG_AVX)

  126. #define CPUFLAG_XOP      (AV_CPU_FLAG_XOP      | CPUFLAG_AVX)

  127. #define CPUFLAG_FMA3     (AV_CPU_FLAG_FMA3     | CPUFLAG_AVX)

  128. #define CPUFLAG_FMA4     (AV_CPU_FLAG_FMA4     | CPUFLAG_AVX)

  129. #define CPUFLAG_AVX2     (AV_CPU_FLAG_AVX2     | CPUFLAG_AVX)

  130. #define CPUFLAG_BMI2     (AV_CPU_FLAG_BMI2     | AV_CPU_FLAG_BMI1)

  131. #define CPUFLAG_AESNI    (AV_CPU_FLAG_AESNI    | CPUFLAG_SSE42)

  132. #define CPUFLAG_AVX512   (AV_CPU_FLAG_AVX512   | CPUFLAG_AVX2)

  133.     static const AVOption cpuflags_opts[] = {

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

  135. #if   ARCH_PPC

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

  137. #elif ARCH_X86

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

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

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

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

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

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

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

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

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

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

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

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

  150.         { "avxslow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVXSLOW      },    .unit = "flags" },

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

  152.         { "fma3"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA3         },    .unit = "flags" },

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

  154.         { "avx2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX2         },    .unit = "flags" },

  155.         { "bmi1"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI1     },    .unit = "flags" },

  156.         { "bmi2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_BMI2         },    .unit = "flags" },

  157.         { "3dnow"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOW        },    .unit = "flags" },

  158.         { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOWEXT     },    .unit = "flags" },

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

  160.         { "aesni"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AESNI        },    .unit = "flags" },

  161.         { "avx512"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX512       },    .unit = "flags" },

  162. #elif ARCH_ARM

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

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

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

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

  167.         { "vfp_vm",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP_VM   },    .unit = "flags" },

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

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

  170. #elif ARCH_AARCH64

  171.         { "armv8",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV8    },    .unit = "flags" },

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

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

  174. #elif ARCH_MIPS

  175.         { "mmi",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMI      },    .unit = "flags" },

  176.         { "msa",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MSA      },    .unit = "flags" },

  177. #endif

  178.         { NULL },

  179.     };

  180.     static const AVClass class = {

  181.         .class_name = "cpuflags",

  182.         .item_name  = av_default_item_name,

  183.         .option     = cpuflags_opts,

  184.         .version    = LIBAVUTIL_VERSION_INT,

  185.     };

  186. 

  187.     int flags = 0, ret;

  188.     const AVClass *pclass = &class;

  189. 

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

  191.         return ret;

  192. 

  193.     return flags & INT_MAX;

  194. }

  195. 

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

  197. {

  198.         static const AVOption cpuflags_opts[] = {

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

  200. #if   ARCH_PPC

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

  202. #elif ARCH_X86

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

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

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

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

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

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

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

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

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

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

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

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

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

  216.         { "avxslow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVXSLOW  },    .unit = "flags" },

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

  218.         { "fma3"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_FMA3     },    .unit = "flags" },

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

  220.         { "avx2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX2     },    .unit = "flags" },

  221.         { "bmi1"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI1     },    .unit = "flags" },

  222.         { "bmi2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI2     },    .unit = "flags" },

  223.         { "3dnow"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOW    },    .unit = "flags" },

  224.         { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOWEXT },    .unit = "flags" },

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

  226.         { "aesni",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AESNI    },    .unit = "flags" },

  227.         { "avx512"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX512   },    .unit = "flags" },

  228. 

  229. #define CPU_FLAG_P2 AV_CPU_FLAG_CMOV | AV_CPU_FLAG_MMX

  230. #define CPU_FLAG_P3 CPU_FLAG_P2 | AV_CPU_FLAG_MMX2 | AV_CPU_FLAG_SSE

  231. #define CPU_FLAG_P4 CPU_FLAG_P3| AV_CPU_FLAG_SSE2

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

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

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

  235. 

  236. #define CPU_FLAG_K62 AV_CPU_FLAG_MMX | AV_CPU_FLAG_3DNOW

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

  238. #define CPU_FLAG_ATHLONXP CPU_FLAG_ATHLON | AV_CPU_FLAG_SSE

  239. #define CPU_FLAG_K8  CPU_FLAG_ATHLONXP | AV_CPU_FLAG_SSE2

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

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

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

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

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

  245. #elif ARCH_ARM

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

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

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

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

  250.         { "vfp_vm",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP_VM   },    .unit = "flags" },

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

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

  253.         { "setend",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SETEND   },    .unit = "flags" },

  254. #elif ARCH_AARCH64

  255.         { "armv8",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV8    },    .unit = "flags" },

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

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

  258. #elif ARCH_MIPS

  259.         { "mmi",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMI      },    .unit = "flags" },

  260.         { "msa",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MSA      },    .unit = "flags" },

  261. #endif

  262.         { NULL },

  263.     };

  264.     static const AVClass class = {

  265.         .class_name = "cpuflags",

  266.         .item_name  = av_default_item_name,

  267.         .option     = cpuflags_opts,

  268.         .version    = LIBAVUTIL_VERSION_INT,

  269.     };

  270.     const AVClass *pclass = &class;

  271. 

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

  273. }

  274. 

  275. int av_cpu_count(void)

  276. {

  277.     static volatile int printed;

  278. 

  279.     int nb_cpus = 1;

  280. #if HAVE_WINRT

  281.     SYSTEM_INFO sysinfo;

  282. #endif

  283. #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)

  284.     cpu_set_t cpuset;

  285. 

  286.     CPU_ZERO(&cpuset);

  287. 

  288.     if (!sched_getaffinity(0, sizeof(cpuset), &cpuset))

  289.         nb_cpus = CPU_COUNT(&cpuset);

  290. #elif HAVE_GETPROCESSAFFINITYMASK

  291.     DWORD_PTR proc_aff, sys_aff;

  292.     if (GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff))

  293.         nb_cpus = av_popcount64(proc_aff);

  294. #elif HAVE_SYSCTL && defined(HW_NCPU)

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

  296.     size_t len = sizeof(nb_cpus);

  297. 

  298.     if (sysctl(mib, 2, &nb_cpus, &len, NULL, 0) == -1)

  299.         nb_cpus = 0;

  300. #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)

  301.     nb_cpus = sysconf(_SC_NPROC_ONLN);

  302. #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)

  303.     nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);

  304. #elif HAVE_WINRT

  305.     GetNativeSystemInfo(&sysinfo);

  306.     nb_cpus = sysinfo.dwNumberOfProcessors;

  307. #endif

  308. 

  309.     if (!printed) {

  310.         av_log(NULL, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);

  311.         printed = 1;

  312.     }

  313. 

  314.     return nb_cpus;

  315. }

  316. 

  317. size_t av_cpu_max_align(void)

  318. {

  319.     if (ARCH_MIPS)

  320.         return ff_get_cpu_max_align_mips();

  321.     if (ARCH_AARCH64)

  322.         return ff_get_cpu_max_align_aarch64();

  323.     if (ARCH_ARM)

  324.         return ff_get_cpu_max_align_arm();

  325.     if (ARCH_PPC)

  326.         return ff_get_cpu_max_align_ppc();

  327.     if (ARCH_X86)

  328.         return ff_get_cpu_max_align_x86();

  329. 

  330.     return 8;

  331. }