text: /*
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #include <stdint.h>
  
  #include "cpu.h"
  #include "cpu_internal.h"
  #include "config.h"
  #include "opt.h"
  #include "common.h"
  
  #if HAVE_SCHED_GETAFFINITY
  #ifndef _GNU_SOURCE
  # define _GNU_SOURCE
  #endif
  #include <sched.h>
  #endif
  #if HAVE_GETPROCESSAFFINITYMASK
  #include <windows.h>
  #endif
  #if HAVE_SYSCTL
  #if HAVE_SYS_PARAM_H
  #include <sys/param.h>
  #endif
  #include <sys/types.h>
  #include <sys/sysctl.h>
  #endif
  #if HAVE_UNISTD_H
  #include <unistd.h>
  #endif
  
  static int flags, checked;
  
  void av_force_cpu_flags(int arg){
      if (   (arg & ( AV_CPU_FLAG_3DNOW    |
                      AV_CPU_FLAG_3DNOWEXT |
                      AV_CPU_FLAG_MMXEXT   |
                      AV_CPU_FLAG_SSE      |
                      AV_CPU_FLAG_SSE2     |
                      AV_CPU_FLAG_SSE2SLOW |
                      AV_CPU_FLAG_SSE3     |
                      AV_CPU_FLAG_SSE3SLOW |
                      AV_CPU_FLAG_SSSE3    |
                      AV_CPU_FLAG_SSE4     |
                      AV_CPU_FLAG_SSE42    |
                      AV_CPU_FLAG_AVX      |
                      AV_CPU_FLAG_AVXSLOW  |
                      AV_CPU_FLAG_XOP      |
                      AV_CPU_FLAG_FMA3     |
                      AV_CPU_FLAG_FMA4     |
                      AV_CPU_FLAG_AVX2     ))
          && !(arg & AV_CPU_FLAG_MMX)) {
          av_log(NULL, AV_LOG_WARNING, "MMX implied by specified flags\n");
          arg |= AV_CPU_FLAG_MMX;
      }
  
      flags   = arg;
      checked = arg != -1;
  }
  
  int av_get_cpu_flags(void)
  {
      if (checked)
          return flags;
  
      if (ARCH_AARCH64)
          flags = ff_get_cpu_flags_aarch64();
      if (ARCH_ARM)
          flags = ff_get_cpu_flags_arm();
      if (ARCH_PPC)
          flags = ff_get_cpu_flags_ppc();
      if (ARCH_X86)
          flags = ff_get_cpu_flags_x86();
  
      checked = 1;
      return flags;
  }
  
  void av_set_cpu_flags_mask(int mask)
  {
      checked       = 0;
      flags         = av_get_cpu_flags() & mask;
      checked       = 1;
  }
  
  int av_parse_cpu_flags(const char *s)
  {
  #define CPUFLAG_MMXEXT   (AV_CPU_FLAG_MMX      | AV_CPU_FLAG_MMXEXT | AV_CPU_FLAG_CMOV)
  #define CPUFLAG_3DNOW    (AV_CPU_FLAG_3DNOW    | AV_CPU_FLAG_MMX)
  #define CPUFLAG_3DNOWEXT (AV_CPU_FLAG_3DNOWEXT | CPUFLAG_3DNOW)
  #define CPUFLAG_SSE      (AV_CPU_FLAG_SSE      | CPUFLAG_MMXEXT)
  #define CPUFLAG_SSE2     (AV_CPU_FLAG_SSE2     | CPUFLAG_SSE)
  #define CPUFLAG_SSE2SLOW (AV_CPU_FLAG_SSE2SLOW | CPUFLAG_SSE2)
  #define CPUFLAG_SSE3     (AV_CPU_FLAG_SSE3     | CPUFLAG_SSE2)
  #define CPUFLAG_SSE3SLOW (AV_CPU_FLAG_SSE3SLOW | CPUFLAG_SSE3)
  #define CPUFLAG_SSSE3    (AV_CPU_FLAG_SSSE3    | CPUFLAG_SSE3)
  #define CPUFLAG_SSE4     (AV_CPU_FLAG_SSE4     | CPUFLAG_SSSE3)
  #define CPUFLAG_SSE42    (AV_CPU_FLAG_SSE42    | CPUFLAG_SSE4)
  #define CPUFLAG_AVX      (AV_CPU_FLAG_AVX      | CPUFLAG_SSE42)
  #define CPUFLAG_AVXSLOW  (AV_CPU_FLAG_AVXSLOW  | CPUFLAG_AVX)
  #define CPUFLAG_XOP      (AV_CPU_FLAG_XOP      | CPUFLAG_AVX)
  #define CPUFLAG_FMA3     (AV_CPU_FLAG_FMA3     | CPUFLAG_AVX)
  #define CPUFLAG_FMA4     (AV_CPU_FLAG_FMA4     | CPUFLAG_AVX)
  #define CPUFLAG_AVX2     (AV_CPU_FLAG_AVX2     | CPUFLAG_AVX)
  #define CPUFLAG_BMI2     (AV_CPU_FLAG_BMI2     | AV_CPU_FLAG_BMI1)
      static const AVOption cpuflags_opts[] = {
          { "flags"   , NULL, 0, AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT64_MIN, INT64_MAX, .unit = "flags" },
  #if   ARCH_PPC
          { "altivec" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ALTIVEC  },    .unit = "flags" },
  #elif ARCH_X86
          { "mmx"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX      },    .unit = "flags" },
          { "mmxext"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_MMXEXT       },    .unit = "flags" },
          { "sse"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE          },    .unit = "flags" },
          { "sse2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE2         },    .unit = "flags" },
          { "sse2slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE2SLOW     },    .unit = "flags" },
          { "sse3"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE3         },    .unit = "flags" },
          { "sse3slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE3SLOW     },    .unit = "flags" },
          { "ssse3"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSSE3        },    .unit = "flags" },
          { "atom"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ATOM     },    .unit = "flags" },
          { "sse4.1"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE4         },    .unit = "flags" },
          { "sse4.2"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE42        },    .unit = "flags" },
          { "avx"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX          },    .unit = "flags" },
          { "avxslow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVXSLOW      },    .unit = "flags" },
          { "xop"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_XOP          },    .unit = "flags" },
          { "fma3"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA3         },    .unit = "flags" },
          { "fma4"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA4         },    .unit = "flags" },
          { "avx2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX2         },    .unit = "flags" },
          { "bmi1"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI1     },    .unit = "flags" },
          { "bmi2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_BMI2         },    .unit = "flags" },
          { "3dnow"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOW        },    .unit = "flags" },
          { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOWEXT     },    .unit = "flags" },
          { "cmov",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV     },    .unit = "flags" },
  #elif ARCH_ARM
          { "armv5te",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV5TE  },    .unit = "flags" },
          { "armv6",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6    },    .unit = "flags" },
          { "armv6t2",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6T2  },    .unit = "flags" },
          { "vfp",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP      },    .unit = "flags" },
          { "vfpv3",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFPV3    },    .unit = "flags" },
          { "neon",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON     },    .unit = "flags" },
  #elif ARCH_AARCH64
          { "armv8",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV8    },    .unit = "flags" },
          { "neon",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON     },    .unit = "flags" },
          { "vfp",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP      },    .unit = "flags" },
  #endif
          { NULL },
      };
      static const AVClass class = {
          .class_name = "cpuflags",
          .item_name  = av_default_item_name,
          .option     = cpuflags_opts,
          .version    = LIBAVUTIL_VERSION_INT,
      };
  
      int flags = 0, ret;
      const AVClass *pclass = &class;
  
      if ((ret = av_opt_eval_flags(&pclass, &cpuflags_opts[0], s, &flags)) < 0)
          return ret;
  
      return flags & INT_MAX;
  }
  
  int av_parse_cpu_caps(unsigned *flags, const char *s)
  {
          static const AVOption cpuflags_opts[] = {
          { "flags"   , NULL, 0, AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT64_MIN, INT64_MAX, .unit = "flags" },
  #if   ARCH_PPC
          { "altivec" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ALTIVEC  },    .unit = "flags" },
  #elif ARCH_X86
          { "mmx"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX      },    .unit = "flags" },
          { "mmx2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX2     },    .unit = "flags" },
          { "mmxext"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX2     },    .unit = "flags" },
          { "sse"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE      },    .unit = "flags" },
          { "sse2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE2     },    .unit = "flags" },
          { "sse2slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE2SLOW },    .unit = "flags" },
          { "sse3"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE3     },    .unit = "flags" },
          { "sse3slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE3SLOW },    .unit = "flags" },
          { "ssse3"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSSE3    },    .unit = "flags" },
          { "atom"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ATOM     },    .unit = "flags" },
          { "sse4.1"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE4     },    .unit = "flags" },
          { "sse4.2"  , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE42    },    .unit = "flags" },
          { "avx"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX      },    .unit = "flags" },
          { "avxslow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVXSLOW  },    .unit = "flags" },
          { "xop"     , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_XOP      },    .unit = "flags" },
          { "fma3"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_FMA3     },    .unit = "flags" },
          { "fma4"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_FMA4     },    .unit = "flags" },
          { "avx2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX2     },    .unit = "flags" },
          { "bmi1"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI1     },    .unit = "flags" },
          { "bmi2"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI2     },    .unit = "flags" },
          { "3dnow"   , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOW    },    .unit = "flags" },
          { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOWEXT },    .unit = "flags" },
          { "cmov",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV     },    .unit = "flags" },
  
  #define CPU_FLAG_P2 AV_CPU_FLAG_CMOV | AV_CPU_FLAG_MMX
  #define CPU_FLAG_P3 CPU_FLAG_P2 | AV_CPU_FLAG_MMX2 | AV_CPU_FLAG_SSE
  #define CPU_FLAG_P4 CPU_FLAG_P3| AV_CPU_FLAG_SSE2
          { "pentium2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P2          },    .unit = "flags" },
          { "pentium3", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P3          },    .unit = "flags" },
          { "pentium4", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P4          },    .unit = "flags" },
  
  #define CPU_FLAG_K62 AV_CPU_FLAG_MMX | AV_CPU_FLAG_3DNOW
  #define CPU_FLAG_ATHLON   CPU_FLAG_K62 | AV_CPU_FLAG_CMOV | AV_CPU_FLAG_3DNOWEXT | AV_CPU_FLAG_MMX2
  #define CPU_FLAG_ATHLONXP CPU_FLAG_ATHLON | AV_CPU_FLAG_SSE
  #define CPU_FLAG_K8  CPU_FLAG_ATHLONXP | AV_CPU_FLAG_SSE2
          { "k6",       NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX      },    .unit = "flags" },
          { "k62",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_K62         },    .unit = "flags" },
          { "athlon",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_ATHLON      },    .unit = "flags" },
          { "athlonxp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_ATHLONXP    },    .unit = "flags" },
          { "k8",       NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_K8          },    .unit = "flags" },
  #elif ARCH_ARM
          { "armv5te",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV5TE  },    .unit = "flags" },
          { "armv6",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6    },    .unit = "flags" },
          { "armv6t2",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6T2  },    .unit = "flags" },
          { "vfp",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP      },    .unit = "flags" },
          { "vfpv3",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFPV3    },    .unit = "flags" },
          { "neon",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON     },    .unit = "flags" },
          { "setend",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SETEND   },    .unit = "flags" },
  #elif ARCH_AARCH64
          { "armv8",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV8    },    .unit = "flags" },
          { "neon",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON     },    .unit = "flags" },
          { "vfp",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP      },    .unit = "flags" },
  #endif
          { NULL },
      };
      static const AVClass class = {
          .class_name = "cpuflags",
          .item_name  = av_default_item_name,
          .option     = cpuflags_opts,
          .version    = LIBAVUTIL_VERSION_INT,
      };
      const AVClass *pclass = &class;
  
      return av_opt_eval_flags(&pclass, &cpuflags_opts[0], s, flags);
  }
  
  int av_cpu_count(void)
  {
      static volatile int printed;
  
      int nb_cpus = 1;
  #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
      cpu_set_t cpuset;
  
      CPU_ZERO(&cpuset);
  
      if (!sched_getaffinity(0, sizeof(cpuset), &cpuset))
          nb_cpus = CPU_COUNT(&cpuset);
  #elif HAVE_GETPROCESSAFFINITYMASK
      DWORD_PTR proc_aff, sys_aff;
      if (GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff))
          nb_cpus = av_popcount64(proc_aff);
  #elif HAVE_SYSCTL && defined(HW_NCPU)
      int mib[2] = { CTL_HW, HW_NCPU };
      size_t len = sizeof(nb_cpus);
  
      if (sysctl(mib, 2, &nb_cpus, &len, NULL, 0) == -1)
          nb_cpus = 0;
  #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
      nb_cpus = sysconf(_SC_NPROC_ONLN);
  #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
      nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
  #endif
  
      if (!printed) {
          av_log(NULL, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
          printed = 1;
      }
  
      return nb_cpus;
  }
  
  #ifdef TEST
  
  #include <stdio.h>
  #include "avstring.h"
  
  #if !HAVE_GETOPT
  #include "compat/getopt.c"
  #endif
  
  static const struct {
      int flag;
      const char *name;
  } cpu_flag_tab[] = {
  #if   ARCH_AARCH64
      { AV_CPU_FLAG_ARMV8,     "armv8"      },
      { AV_CPU_FLAG_NEON,      "neon"       },
      { AV_CPU_FLAG_VFP,       "vfp"        },
  #elif ARCH_ARM
      { AV_CPU_FLAG_ARMV5TE,   "armv5te"    },
      { AV_CPU_FLAG_ARMV6,     "armv6"      },
      { AV_CPU_FLAG_ARMV6T2,   "armv6t2"    },
      { AV_CPU_FLAG_VFP,       "vfp"        },
      { AV_CPU_FLAG_VFPV3,     "vfpv3"      },
      { AV_CPU_FLAG_NEON,      "neon"       },
      { AV_CPU_FLAG_SETEND,    "setend"     },
  #elif ARCH_PPC
      { AV_CPU_FLAG_ALTIVEC,   "altivec"    },
  #elif ARCH_X86
      { AV_CPU_FLAG_MMX,       "mmx"        },
      { AV_CPU_FLAG_MMXEXT,    "mmxext"     },
      { AV_CPU_FLAG_SSE,       "sse"        },
      { AV_CPU_FLAG_SSE2,      "sse2"       },
      { AV_CPU_FLAG_SSE2SLOW,  "sse2slow"   },
      { AV_CPU_FLAG_SSE3,      "sse3"       },
      { AV_CPU_FLAG_SSE3SLOW,  "sse3slow"   },
      { AV_CPU_FLAG_SSSE3,     "ssse3"      },
      { AV_CPU_FLAG_ATOM,      "atom"       },
      { AV_CPU_FLAG_SSE4,      "sse4.1"     },
      { AV_CPU_FLAG_SSE42,     "sse4.2"     },
      { AV_CPU_FLAG_AVX,       "avx"        },
      { AV_CPU_FLAG_AVXSLOW,   "avxslow"    },
      { AV_CPU_FLAG_XOP,       "xop"        },
      { AV_CPU_FLAG_FMA3,      "fma3"       },
      { AV_CPU_FLAG_FMA4,      "fma4"       },
      { AV_CPU_FLAG_3DNOW,     "3dnow"      },
      { AV_CPU_FLAG_3DNOWEXT,  "3dnowext"   },
      { AV_CPU_FLAG_CMOV,      "cmov"       },
      { AV_CPU_FLAG_AVX2,      "avx2"       },
      { AV_CPU_FLAG_BMI1,      "bmi1"       },
      { AV_CPU_FLAG_BMI2,      "bmi2"       },
  #endif
      { 0 }
  };
  
  static void print_cpu_flags(int cpu_flags, const char *type)
  {
      int i;
  
      printf("cpu_flags(%s) = 0x%08X\n", type, cpu_flags);
      printf("cpu_flags_str(%s) =", type);
      for (i = 0; cpu_flag_tab[i].flag; i++)
          if (cpu_flags & cpu_flag_tab[i].flag)
              printf(" %s", cpu_flag_tab[i].name);
      printf("\n");
  }
  
  
  int main(int argc, char **argv)
  {
      int cpu_flags_raw = av_get_cpu_flags();
      int cpu_flags_eff;
      int cpu_count = av_cpu_count();
      char threads[5] = "auto";
      int i;
  
      for(i = 0; cpu_flag_tab[i].flag; i++) {
          unsigned tmp = 0;
          if (av_parse_cpu_caps(&tmp, cpu_flag_tab[i].name) < 0) {
              fprintf(stderr, "Table missing %s\n", cpu_flag_tab[i].name);
              return 4;
          }
      }
  
      if (cpu_flags_raw < 0)
          return 1;
  
      for (;;) {
          int c = getopt(argc, argv, "c:t:");
          if (c == -1)
              break;
          switch (c) {
          case 'c':
          {
              unsigned flags = av_get_cpu_flags();
              if (av_parse_cpu_caps(&flags, optarg) < 0)
                  return 2;
  
              av_force_cpu_flags(flags);
              break;
          }
          case 't':
          {
              int len = av_strlcpy(threads, optarg, sizeof(threads));
              if (len >= sizeof(threads)) {
                  fprintf(stderr, "Invalid thread count '%s'\n", optarg);
                  return 2;
              }
          }
          }
      }
  
      cpu_flags_eff = av_get_cpu_flags();
  
      if (cpu_flags_eff < 0)
          return 3;
  
      print_cpu_flags(cpu_flags_raw, "raw");
      print_cpu_flags(cpu_flags_eff, "effective");
      printf("threads = %s (cpu_count = %d)\n", threads, cpu_count);
  
      return 0;
  }
  
  #endif
  