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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 "cpu_internal.h"

  21. #include "config.h"

  22. #include "opt.h"

  23. #include "common.h"

  24. 

  25. #if HAVE_SCHED_GETAFFINITY

  26. #ifndef _GNU_SOURCE

  27. # define _GNU_SOURCE

  28. #endif

  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 flags, checked;

  46. 

  47. void av_force_cpu_flags(int arg){

  48.     flags   = arg;

  49.     checked = arg != -1;

  50. }

  51. 

  52. int av_get_cpu_flags(void)

  53. {

  54.     if (checked)

  55.         return flags;

  56. 

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

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

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

  60. 

  61.     checked = 1;

  62.     return flags;

  63. }

  64. 

  65. void av_set_cpu_flags_mask(int mask)

  66. {

  67.     checked       = 0;

  68.     flags         = av_get_cpu_flags() & mask;

  69.     checked       = 1;

  70. }

  71. 

  72. int av_parse_cpu_flags(const char *s)

  73. {

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

  75. #define CPUFLAG_3DNOW    (AV_CPU_FLAG_3DNOW    | AV_CPU_FLAG_MMX)

  76. #define CPUFLAG_3DNOWEXT (AV_CPU_FLAG_3DNOWEXT | CPUFLAG_3DNOW)

  77. #define CPUFLAG_SSE      (AV_CPU_FLAG_SSE      | CPUFLAG_MMXEXT)

  78. #define CPUFLAG_SSE2     (AV_CPU_FLAG_SSE2     | CPUFLAG_SSE)

  79. #define CPUFLAG_SSE2SLOW (AV_CPU_FLAG_SSE2SLOW | CPUFLAG_SSE2)

  80. #define CPUFLAG_SSE3     (AV_CPU_FLAG_SSE3     | CPUFLAG_SSE2)

  81. #define CPUFLAG_SSE3SLOW (AV_CPU_FLAG_SSE3SLOW | CPUFLAG_SSE3)

  82. #define CPUFLAG_SSSE3    (AV_CPU_FLAG_SSSE3    | CPUFLAG_SSE3)

  83. #define CPUFLAG_SSE4     (AV_CPU_FLAG_SSE4     | CPUFLAG_SSSE3)

  84. #define CPUFLAG_SSE42    (AV_CPU_FLAG_SSE42    | CPUFLAG_SSE4)

  85. #define CPUFLAG_AVX      (AV_CPU_FLAG_AVX      | CPUFLAG_SSE42)

  86. #define CPUFLAG_XOP      (AV_CPU_FLAG_XOP      | CPUFLAG_AVX)

  87. #define CPUFLAG_FMA4     (AV_CPU_FLAG_FMA4     | CPUFLAG_AVX)

  88.     static const AVOption cpuflags_opts[] = {

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

  90. #if   ARCH_PPC

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

  92. #elif ARCH_X86

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  107.         { "3dnow"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOW        },    .unit = "flags" },

  108.         { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOWEXT     },    .unit = "flags" },

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

  110. #elif ARCH_ARM

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

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

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

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

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

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

  117. #endif

  118.         { NULL },

  119.     };

  120.     static const AVClass class = {

  121.         .class_name = "cpuflags",

  122.         .item_name  = av_default_item_name,

  123.         .option     = cpuflags_opts,

  124.         .version    = LIBAVUTIL_VERSION_INT,

  125.     };

  126. 

  127.     int flags = 0, ret;

  128.     const AVClass *pclass = &class;

  129. 

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

  131.         return ret;

  132. 

  133.     return flags & INT_MAX;

  134. }

  135. 

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

  137. {

  138.         static const AVOption cpuflags_opts[] = {

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

  140. #if   ARCH_PPC

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

  142. #elif ARCH_X86

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  158.         { "3dnow"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOW    },    .unit = "flags" },

  159.         { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOWEXT },    .unit = "flags" },

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

  161. 

  162. #define CPU_FLAG_P2 AV_CPU_FLAG_CMOV | AV_CPU_FLAG_MMX

  163. #define CPU_FLAG_P3 CPU_FLAG_P2 | AV_CPU_FLAG_MMX2 | AV_CPU_FLAG_SSE

  164. #define CPU_FLAG_P4 CPU_FLAG_P3| AV_CPU_FLAG_SSE2

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

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

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

  168. 

  169. #define CPU_FLAG_K62 AV_CPU_FLAG_MMX | AV_CPU_FLAG_3DNOW

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

  171. #define CPU_FLAG_ATHLONXP CPU_FLAG_ATHLON | AV_CPU_FLAG_SSE

  172. #define CPU_FLAG_K8  CPU_FLAG_ATHLONXP | AV_CPU_FLAG_SSE2

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

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

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

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

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

  178. #elif ARCH_ARM

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

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

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

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

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

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

  185. #endif

  186.         { NULL },

  187.     };

  188.     static const AVClass class = {

  189.         .class_name = "cpuflags",

  190.         .item_name  = av_default_item_name,

  191.         .option     = cpuflags_opts,

  192.         .version    = LIBAVUTIL_VERSION_INT,

  193.     };

  194.     const AVClass *pclass = &class;

  195. 

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

  197. }

  198. 

  199. int av_cpu_count(void)

  200. {

  201.     static volatile int printed;

  202. 

  203.     int nb_cpus = 1;

  204. #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)

  205.     cpu_set_t cpuset;

  206. 

  207.     CPU_ZERO(&cpuset);

  208. 

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

  210.         nb_cpus = CPU_COUNT(&cpuset);

  211. #elif HAVE_GETPROCESSAFFINITYMASK

  212.     DWORD_PTR proc_aff, sys_aff;

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

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

  220.         nb_cpus = 0;

  221. #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)

  222.     nb_cpus = sysconf(_SC_NPROC_ONLN);

  223. #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)

  224.     nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);

  225. #endif

  226. 

  227.     if (!printed) {

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

  229.         printed = 1;

  230.     }

  231. 

  232.     return nb_cpus;

  233. }

  234. 

  235. #ifdef TEST

  236. 

  237. #include <stdio.h>

  238. 

  239. static const struct {

  240.     int flag;

  241.     const char *name;

  242. } cpu_flag_tab[] = {

  243. #if   ARCH_ARM

  244.     { AV_CPU_FLAG_ARMV5TE,   "armv5te"    },

  245.     { AV_CPU_FLAG_ARMV6,     "armv6"      },

  246.     { AV_CPU_FLAG_ARMV6T2,   "armv6t2"    },

  247.     { AV_CPU_FLAG_VFP,       "vfp"        },

  248.     { AV_CPU_FLAG_VFPV3,     "vfpv3"      },

  249.     { AV_CPU_FLAG_NEON,      "neon"       },

  250. #elif ARCH_PPC

  251.     { AV_CPU_FLAG_ALTIVEC,   "altivec"    },

  252. #elif ARCH_X86

  253.     { AV_CPU_FLAG_MMX,       "mmx"        },

  254.     { AV_CPU_FLAG_MMXEXT,    "mmxext"     },

  255.     { AV_CPU_FLAG_SSE,       "sse"        },

  256.     { AV_CPU_FLAG_SSE2,      "sse2"       },

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

  258.     { AV_CPU_FLAG_SSE3,      "sse3"       },

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

  260.     { AV_CPU_FLAG_SSSE3,     "ssse3"      },

  261.     { AV_CPU_FLAG_ATOM,      "atom"       },

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

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

  264.     { AV_CPU_FLAG_AVX,       "avx"        },

  265.     { AV_CPU_FLAG_XOP,       "xop"        },

  266.     { AV_CPU_FLAG_FMA4,      "fma4"       },

  267.     { AV_CPU_FLAG_3DNOW,     "3dnow"      },

  268.     { AV_CPU_FLAG_3DNOWEXT,  "3dnowext"   },

  269.     { AV_CPU_FLAG_CMOV,      "cmov"       },

  270. #endif

  271.     { 0 }

  272. };

  273. 

  274. int main(void)

  275. {

  276.     int cpu_flags = av_get_cpu_flags();

  277.     int i;

  278. 

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

  280.     printf("cpu_flags =");

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

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

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

  284.     printf("\n");

  285. 

  286.     return 0;

  287. }

  288. 

  289. #endif