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FFmpeg/libavutil/cpu.c

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  1. /*

  2.  * This file is part of Libav.

  3.  *

  4.  * Libav 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.  * Libav 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 Libav; if not, write to the Free Software

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

  17.  */

  18. 

  19. #include <stdint.h>

  20. 

  21. #include "cpu.h"

  22. #include "cpu_internal.h"

  23. #include "config.h"

  24. #include "opt.h"

  25. #include "common.h"

  26. 

  27. #if HAVE_SCHED_GETAFFINITY

  28. #define _GNU_SOURCE

  29. #include <sched.h>

  30. #endif

  31. #if HAVE_GETPROCESSAFFINITYMASK

  32. #include <windows.h>

  33. #endif

  34. #if HAVE_SYSCTL

  35. #if HAVE_SYS_PARAM_H

  36. #include <sys/param.h>

  37. #endif

  38. #include <sys/types.h>

  39. #include <sys/sysctl.h>

  40. #endif

  41. #if HAVE_SYSCONF

  42. #include <unistd.h>

  43. #endif

  44. 

  45. static int cpuflags_mask = -1, checked;

  46. 

  47. int av_get_cpu_flags(void)

  48. {

  49.     static int flags;

  50. 

  51.     if (checked)

  52.         return flags;

  53. 

  54.     if (ARCH_AARCH64)

  55.         flags = ff_get_cpu_flags_aarch64();

  56.     if (ARCH_ARM)

  57.         flags = ff_get_cpu_flags_arm();

  58.     if (ARCH_PPC)

  59.         flags = ff_get_cpu_flags_ppc();

  60.     if (ARCH_X86)

  61.         flags = ff_get_cpu_flags_x86();

  62. 

  63.     flags  &= cpuflags_mask;

  64.     checked = 1;

  65. 

  66.     return flags;

  67. }

  68. 

  69. void av_set_cpu_flags_mask(int mask)

  70. {

  71.     cpuflags_mask = mask;

  72.     checked       = 0;

  73. }

  74. 

  75. int av_parse_cpu_flags(const char *s)

  76. {

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

  78. #define CPUFLAG_3DNOW    (AV_CPU_FLAG_3DNOW    | AV_CPU_FLAG_MMX)

  79. #define CPUFLAG_3DNOWEXT (AV_CPU_FLAG_3DNOWEXT | CPUFLAG_3DNOW)

  80. #define CPUFLAG_SSE      (AV_CPU_FLAG_SSE      | CPUFLAG_MMXEXT)

  81. #define CPUFLAG_SSE2     (AV_CPU_FLAG_SSE2     | CPUFLAG_SSE)

  82. #define CPUFLAG_SSE2SLOW (AV_CPU_FLAG_SSE2SLOW | CPUFLAG_SSE2)

  83. #define CPUFLAG_SSE3     (AV_CPU_FLAG_SSE3     | CPUFLAG_SSE2)

  84. #define CPUFLAG_SSE3SLOW (AV_CPU_FLAG_SSE3SLOW | CPUFLAG_SSE3)

  85. #define CPUFLAG_SSSE3    (AV_CPU_FLAG_SSSE3    | CPUFLAG_SSE3)

  86. #define CPUFLAG_SSE4     (AV_CPU_FLAG_SSE4     | CPUFLAG_SSSE3)

  87. #define CPUFLAG_SSE42    (AV_CPU_FLAG_SSE42    | CPUFLAG_SSE4)

  88. #define CPUFLAG_AVX      (AV_CPU_FLAG_AVX      | CPUFLAG_SSE42)

  89. #define CPUFLAG_XOP      (AV_CPU_FLAG_XOP      | CPUFLAG_AVX)

  90. #define CPUFLAG_FMA3     (AV_CPU_FLAG_FMA3     | CPUFLAG_AVX)

  91. #define CPUFLAG_FMA4     (AV_CPU_FLAG_FMA4     | CPUFLAG_AVX)

  92. #define CPUFLAG_AVX2     (AV_CPU_FLAG_AVX2     | CPUFLAG_AVX)

  93. #define CPUFLAG_BMI1     (AV_CPU_FLAG_BMI1)

  94. #define CPUFLAG_BMI2     (AV_CPU_FLAG_BMI2     | CPUFLAG_BMI1)

  95.     static const AVOption cpuflags_opts[] = {

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

  97. #if   ARCH_PPC

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

  99. #elif ARCH_X86

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  116.         { "bmi1"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_BMI1         },    .unit = "flags" },

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

  118.         { "3dnow"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOW        },    .unit = "flags" },

  119.         { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOWEXT     },    .unit = "flags" },

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

  121. #elif ARCH_ARM

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

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

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

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

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

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

  128. #elif ARCH_AARCH64

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

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

  131. #endif

  132.         { NULL },

  133.     };

  134.     static const AVClass class = {

  135.         .class_name = "cpuflags",

  136.         .item_name  = av_default_item_name,

  137.         .option     = cpuflags_opts,

  138.         .version    = LIBAVUTIL_VERSION_INT,

  139.     };

  140. 

  141.     int flags = 0, ret;

  142.     const AVClass *pclass = &class;

  143. 

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

  145.         return ret;

  146. 

  147.     return flags & INT_MAX;

  148. }

  149. 

  150. int av_cpu_count(void)

  151. {

  152.     int nb_cpus = 1;

  153. #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)

  154.     cpu_set_t cpuset;

  155. 

  156.     CPU_ZERO(&cpuset);

  157. 

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

  159.         nb_cpus = CPU_COUNT(&cpuset);

  160. #elif HAVE_GETPROCESSAFFINITYMASK

  161.     DWORD_PTR proc_aff, sys_aff;

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

  163.         nb_cpus = av_popcount64(proc_aff);

  164. #elif HAVE_SYSCTL && defined(HW_NCPU)

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

  166.     size_t len = sizeof(nb_cpus);

  167. 

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

  169.         nb_cpus = 0;

  170. #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)

  171.     nb_cpus = sysconf(_SC_NPROC_ONLN);

  172. #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)

  173.     nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);

  174. #endif

  175. 

  176.     return nb_cpus;

  177. }

  178. 

  179. #ifdef TEST

  180. 

  181. #include <stdio.h>

  182. 

  183. static const struct {

  184.     int flag;

  185.     const char *name;

  186. } cpu_flag_tab[] = {

  187. #if   ARCH_AARCH64

  188.     { AV_CPU_FLAG_NEON,      "neon"       },

  189.     { AV_CPU_FLAG_VFP,       "vfp"        },

  190. #elif ARCH_ARM

  191.     { AV_CPU_FLAG_ARMV5TE,   "armv5te"    },

  192.     { AV_CPU_FLAG_ARMV6,     "armv6"      },

  193.     { AV_CPU_FLAG_ARMV6T2,   "armv6t2"    },

  194.     { AV_CPU_FLAG_VFP,       "vfp"        },

  195.     { AV_CPU_FLAG_VFPV3,     "vfpv3"      },

  196.     { AV_CPU_FLAG_NEON,      "neon"       },

  197. #elif ARCH_PPC

  198.     { AV_CPU_FLAG_ALTIVEC,   "altivec"    },

  199. #elif ARCH_X86

  200.     { AV_CPU_FLAG_MMX,       "mmx"        },

  201.     { AV_CPU_FLAG_MMXEXT,    "mmxext"     },

  202.     { AV_CPU_FLAG_SSE,       "sse"        },

  203.     { AV_CPU_FLAG_SSE2,      "sse2"       },

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

  205.     { AV_CPU_FLAG_SSE3,      "sse3"       },

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

  207.     { AV_CPU_FLAG_SSSE3,     "ssse3"      },

  208.     { AV_CPU_FLAG_ATOM,      "atom"       },

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

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

  211.     { AV_CPU_FLAG_AVX,       "avx"        },

  212.     { AV_CPU_FLAG_XOP,       "xop"        },

  213.     { AV_CPU_FLAG_FMA3,      "fma3"       },

  214.     { AV_CPU_FLAG_FMA4,      "fma4"       },

  215.     { AV_CPU_FLAG_3DNOW,     "3dnow"      },

  216.     { AV_CPU_FLAG_3DNOWEXT,  "3dnowext"   },

  217.     { AV_CPU_FLAG_CMOV,      "cmov"       },

  218.     { AV_CPU_FLAG_AVX2,      "avx2"       },

  219.     { AV_CPU_FLAG_BMI1,      "bmi1"       },

  220.     { AV_CPU_FLAG_BMI2,      "bmi2"       },

  221. #endif

  222.     { 0 }

  223. };

  224. 

  225. int main(void)

  226. {

  227.     int cpu_flags = av_get_cpu_flags();

  228.     int i;

  229. 

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

  231.     printf("cpu_flags =");

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

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

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

  235.     printf("\n");

  236. 

  237.     return 0;

  238. }

  239. 

  240. #endif