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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 <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. #ifndef _GNU_SOURCE

  29. # define _GNU_SOURCE

  30. #endif

  31. #include <sched.h>

  32. #endif

  33. #if HAVE_GETPROCESSAFFINITYMASK

  34. #include <windows.h>

  35. #endif

  36. #if HAVE_SYSCTL

  37. #if HAVE_SYS_PARAM_H

  38. #include <sys/param.h>

  39. #endif

  40. #include <sys/types.h>

  41. #include <sys/sysctl.h>

  42. #endif

  43. #if HAVE_SYSCONF

  44. #include <unistd.h>

  45. #endif

  46. 

  47. static int flags, checked;

  48. 

  49. void av_force_cpu_flags(int arg){

  50.     flags   = arg;

  51.     checked = arg != -1;

  52. }

  53. 

  54. int av_get_cpu_flags(void)

  55. {

  56.     if (checked)

  57.         return flags;

  58. 

  59.     if (ARCH_AARCH64)

  60.         flags = ff_get_cpu_flags_aarch64();

  61.     if (ARCH_ARM)

  62.         flags = ff_get_cpu_flags_arm();

  63.     if (ARCH_PPC)

  64.         flags = ff_get_cpu_flags_ppc();

  65.     if (ARCH_X86)

  66.         flags = ff_get_cpu_flags_x86();

  67. 

  68.     checked = 1;

  69.     return flags;

  70. }

  71. 

  72. void av_set_cpu_flags_mask(int mask)

  73. {

  74.     checked       = 0;

  75.     flags         = av_get_cpu_flags() & mask;

  76.     checked       = 1;

  77. }

  78. 

  79. int av_parse_cpu_flags(const char *s)

  80. {

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

  82. #define CPUFLAG_3DNOW    (AV_CPU_FLAG_3DNOW    | AV_CPU_FLAG_MMX)

  83. #define CPUFLAG_3DNOWEXT (AV_CPU_FLAG_3DNOWEXT | CPUFLAG_3DNOW)

  84. #define CPUFLAG_SSE      (AV_CPU_FLAG_SSE      | CPUFLAG_MMXEXT)

  85. #define CPUFLAG_SSE2     (AV_CPU_FLAG_SSE2     | CPUFLAG_SSE)

  86. #define CPUFLAG_SSE2SLOW (AV_CPU_FLAG_SSE2SLOW | CPUFLAG_SSE2)

  87. #define CPUFLAG_SSE3     (AV_CPU_FLAG_SSE3     | CPUFLAG_SSE2)

  88. #define CPUFLAG_SSE3SLOW (AV_CPU_FLAG_SSE3SLOW | CPUFLAG_SSE3)

  89. #define CPUFLAG_SSSE3    (AV_CPU_FLAG_SSSE3    | CPUFLAG_SSE3)

  90. #define CPUFLAG_SSE4     (AV_CPU_FLAG_SSE4     | CPUFLAG_SSSE3)

  91. #define CPUFLAG_SSE42    (AV_CPU_FLAG_SSE42    | CPUFLAG_SSE4)

  92. #define CPUFLAG_AVX      (AV_CPU_FLAG_AVX      | CPUFLAG_SSE42)

  93. #define CPUFLAG_XOP      (AV_CPU_FLAG_XOP      | CPUFLAG_AVX)

  94. #define CPUFLAG_FMA3     (AV_CPU_FLAG_FMA3     | CPUFLAG_AVX)

  95. #define CPUFLAG_FMA4     (AV_CPU_FLAG_FMA4     | CPUFLAG_AVX)

  96. #define CPUFLAG_AVX2     (AV_CPU_FLAG_AVX2     | CPUFLAG_AVX)

  97. #define CPUFLAG_BMI1     (AV_CPU_FLAG_BMI1)

  98. #define CPUFLAG_BMI2     (AV_CPU_FLAG_BMI2     | CPUFLAG_BMI1)

  99.     static const AVOption cpuflags_opts[] = {

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

  101. #if   ARCH_PPC

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

  103. #elif ARCH_X86

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  122.         { "3dnow"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOW        },    .unit = "flags" },

  123.         { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOWEXT     },    .unit = "flags" },

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

  125. #elif ARCH_ARM

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

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

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

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

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

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

  132. #elif ARCH_AARCH64

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

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

  135. #endif

  136.         { NULL },

  137.     };

  138.     static const AVClass class = {

  139.         .class_name = "cpuflags",

  140.         .item_name  = av_default_item_name,

  141.         .option     = cpuflags_opts,

  142.         .version    = LIBAVUTIL_VERSION_INT,

  143.     };

  144. 

  145.     int flags = 0, ret;

  146.     const AVClass *pclass = &class;

  147. 

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

  149.         return ret;

  150. 

  151.     return flags & INT_MAX;

  152. }

  153. 

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

  155. {

  156.         static const AVOption cpuflags_opts[] = {

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

  158. #if   ARCH_PPC

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

  160. #elif ARCH_X86

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  180.         { "3dnow"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOW    },    .unit = "flags" },

  181.         { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOWEXT },    .unit = "flags" },

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

  183. 

  184. #define CPU_FLAG_P2 AV_CPU_FLAG_CMOV | AV_CPU_FLAG_MMX

  185. #define CPU_FLAG_P3 CPU_FLAG_P2 | AV_CPU_FLAG_MMX2 | AV_CPU_FLAG_SSE

  186. #define CPU_FLAG_P4 CPU_FLAG_P3| AV_CPU_FLAG_SSE2

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

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

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

  190. 

  191. #define CPU_FLAG_K62 AV_CPU_FLAG_MMX | AV_CPU_FLAG_3DNOW

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

  193. #define CPU_FLAG_ATHLONXP CPU_FLAG_ATHLON | AV_CPU_FLAG_SSE

  194. #define CPU_FLAG_K8  CPU_FLAG_ATHLONXP | AV_CPU_FLAG_SSE2

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

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

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

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

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

  200. #elif ARCH_ARM

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

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

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

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

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

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

  207. #endif

  208.         { NULL },

  209.     };

  210.     static const AVClass class = {

  211.         .class_name = "cpuflags",

  212.         .item_name  = av_default_item_name,

  213.         .option     = cpuflags_opts,

  214.         .version    = LIBAVUTIL_VERSION_INT,

  215.     };

  216.     const AVClass *pclass = &class;

  217. 

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

  219. }

  220. 

  221. int av_cpu_count(void)

  222. {

  223.     static volatile int printed;

  224. 

  225.     int nb_cpus = 1;

  226. #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)

  227.     cpu_set_t cpuset;

  228. 

  229.     CPU_ZERO(&cpuset);

  230. 

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

  232.         nb_cpus = CPU_COUNT(&cpuset);

  233. #elif HAVE_GETPROCESSAFFINITYMASK

  234.     DWORD_PTR proc_aff, sys_aff;

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

  236.         nb_cpus = av_popcount64(proc_aff);

  237. #elif HAVE_SYSCTL && defined(HW_NCPU)

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

  239.     size_t len = sizeof(nb_cpus);

  240. 

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

  242.         nb_cpus = 0;

  243. #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)

  244.     nb_cpus = sysconf(_SC_NPROC_ONLN);

  245. #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)

  246.     nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);

  247. #endif

  248. 

  249.     if (!printed) {

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

  251.         printed = 1;

  252.     }

  253. 

  254.     return nb_cpus;

  255. }

  256. 

  257. #ifdef TEST

  258. 

  259. #include <stdio.h>

  260. 

  261. static const struct {

  262.     int flag;

  263.     const char *name;

  264. } cpu_flag_tab[] = {

  265. #if   ARCH_AARCH64

  266.     { AV_CPU_FLAG_NEON,      "neon"       },

  267.     { AV_CPU_FLAG_VFP,       "vfp"        },

  268. #elif ARCH_ARM

  269.     { AV_CPU_FLAG_ARMV5TE,   "armv5te"    },

  270.     { AV_CPU_FLAG_ARMV6,     "armv6"      },

  271.     { AV_CPU_FLAG_ARMV6T2,   "armv6t2"    },

  272.     { AV_CPU_FLAG_VFP,       "vfp"        },

  273.     { AV_CPU_FLAG_VFPV3,     "vfpv3"      },

  274.     { AV_CPU_FLAG_NEON,      "neon"       },

  275. #elif ARCH_PPC

  276.     { AV_CPU_FLAG_ALTIVEC,   "altivec"    },

  277. #elif ARCH_X86

  278.     { AV_CPU_FLAG_MMX,       "mmx"        },

  279.     { AV_CPU_FLAG_MMXEXT,    "mmxext"     },

  280.     { AV_CPU_FLAG_SSE,       "sse"        },

  281.     { AV_CPU_FLAG_SSE2,      "sse2"       },

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

  283.     { AV_CPU_FLAG_SSE3,      "sse3"       },

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

  285.     { AV_CPU_FLAG_SSSE3,     "ssse3"      },

  286.     { AV_CPU_FLAG_ATOM,      "atom"       },

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

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

  289.     { AV_CPU_FLAG_AVX,       "avx"        },

  290.     { AV_CPU_FLAG_XOP,       "xop"        },

  291.     { AV_CPU_FLAG_FMA3,      "fma3"       },

  292.     { AV_CPU_FLAG_FMA4,      "fma4"       },

  293.     { AV_CPU_FLAG_3DNOW,     "3dnow"      },

  294.     { AV_CPU_FLAG_3DNOWEXT,  "3dnowext"   },

  295.     { AV_CPU_FLAG_CMOV,      "cmov"       },

  296.     { AV_CPU_FLAG_AVX2,      "avx2"       },

  297.     { AV_CPU_FLAG_BMI1,      "bmi1"       },

  298.     { AV_CPU_FLAG_BMI2,      "bmi2"       },

  299. #endif

  300.     { 0 }

  301. };

  302. 

  303. int main(void)

  304. {

  305.     int cpu_flags = av_get_cpu_flags();

  306.     int i;

  307. 

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

  309.     printf("cpu_flags =");

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

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

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

  313.     printf("\n");

  314. 

  315.     return 0;

  316. }

  317. 

  318. #endif