mirror of
https://github.com/FFmpeg/FFmpeg.git
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196 lines
8.1 KiB
C
196 lines
8.1 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include <stdatomic.h>
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#include "cpu.h"
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#include "cpu_internal.h"
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#include "config.h"
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#include "opt.h"
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#include "common.h"
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#if HAVE_SCHED_GETAFFINITY
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#define _GNU_SOURCE
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#include <sched.h>
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#endif
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#if HAVE_GETPROCESSAFFINITYMASK
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#include <windows.h>
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#endif
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#if HAVE_SYSCTL
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#if HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#endif
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#if HAVE_SYSCONF
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#include <unistd.h>
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#endif
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static atomic_int cpu_flags = ATOMIC_VAR_INIT(-1);
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static int get_cpu_flags(void)
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{
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if (ARCH_AARCH64)
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return ff_get_cpu_flags_aarch64();
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if (ARCH_ARM)
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return ff_get_cpu_flags_arm();
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if (ARCH_PPC)
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return ff_get_cpu_flags_ppc();
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if (ARCH_X86)
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return ff_get_cpu_flags_x86();
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return 0;
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}
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int av_get_cpu_flags(void)
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{
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int flags = atomic_load_explicit(&cpu_flags, memory_order_relaxed);
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if (flags == -1) {
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flags = get_cpu_flags();
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atomic_store_explicit(&cpu_flags, flags, memory_order_relaxed);
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}
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return flags;
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}
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void av_set_cpu_flags_mask(int mask)
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{
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atomic_store_explicit(&cpu_flags, get_cpu_flags() & mask,
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memory_order_relaxed);
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}
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int av_parse_cpu_flags(const char *s)
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{
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#define CPUFLAG_MMXEXT (AV_CPU_FLAG_MMX | AV_CPU_FLAG_MMXEXT | AV_CPU_FLAG_CMOV)
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#define CPUFLAG_3DNOW (AV_CPU_FLAG_3DNOW | AV_CPU_FLAG_MMX)
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#define CPUFLAG_3DNOWEXT (AV_CPU_FLAG_3DNOWEXT | CPUFLAG_3DNOW)
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#define CPUFLAG_SSE (AV_CPU_FLAG_SSE | CPUFLAG_MMXEXT)
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#define CPUFLAG_SSE2 (AV_CPU_FLAG_SSE2 | CPUFLAG_SSE)
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#define CPUFLAG_SSE2SLOW (AV_CPU_FLAG_SSE2SLOW | CPUFLAG_SSE2)
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#define CPUFLAG_SSE3 (AV_CPU_FLAG_SSE3 | CPUFLAG_SSE2)
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#define CPUFLAG_SSE3SLOW (AV_CPU_FLAG_SSE3SLOW | CPUFLAG_SSE3)
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#define CPUFLAG_SSSE3 (AV_CPU_FLAG_SSSE3 | CPUFLAG_SSE3)
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#define CPUFLAG_SSE4 (AV_CPU_FLAG_SSE4 | CPUFLAG_SSSE3)
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#define CPUFLAG_SSE42 (AV_CPU_FLAG_SSE42 | CPUFLAG_SSE4)
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#define CPUFLAG_AVX (AV_CPU_FLAG_AVX | CPUFLAG_SSE42)
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#define CPUFLAG_AVXSLOW (AV_CPU_FLAG_AVXSLOW | CPUFLAG_AVX)
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#define CPUFLAG_XOP (AV_CPU_FLAG_XOP | CPUFLAG_AVX)
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#define CPUFLAG_FMA3 (AV_CPU_FLAG_FMA3 | CPUFLAG_AVX)
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#define CPUFLAG_FMA4 (AV_CPU_FLAG_FMA4 | CPUFLAG_AVX)
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#define CPUFLAG_AVX2 (AV_CPU_FLAG_AVX2 | CPUFLAG_AVX)
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#define CPUFLAG_BMI2 (AV_CPU_FLAG_BMI2 | AV_CPU_FLAG_BMI1)
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static const AVOption cpuflags_opts[] = {
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{ "flags" , NULL, 0, AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT64_MIN, INT64_MAX, .unit = "flags" },
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#if ARCH_PPC
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{ "altivec" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ALTIVEC }, .unit = "flags" },
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#elif ARCH_X86
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{ "mmx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX }, .unit = "flags" },
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{ "mmxext" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_MMXEXT }, .unit = "flags" },
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{ "sse" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE }, .unit = "flags" },
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{ "sse2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE2 }, .unit = "flags" },
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{ "sse2slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE2SLOW }, .unit = "flags" },
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{ "sse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE3 }, .unit = "flags" },
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{ "sse3slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE3SLOW }, .unit = "flags" },
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{ "ssse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSSE3 }, .unit = "flags" },
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{ "atom" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ATOM }, .unit = "flags" },
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{ "sse4.1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE4 }, .unit = "flags" },
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{ "sse4.2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE42 }, .unit = "flags" },
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{ "avx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX }, .unit = "flags" },
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{ "avxslow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVXSLOW }, .unit = "flags" },
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{ "xop" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_XOP }, .unit = "flags" },
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{ "fma3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA3 }, .unit = "flags" },
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{ "fma4" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA4 }, .unit = "flags" },
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{ "avx2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX2 }, .unit = "flags" },
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{ "bmi1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI1 }, .unit = "flags" },
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{ "bmi2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_BMI2 }, .unit = "flags" },
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{ "3dnow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOW }, .unit = "flags" },
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{ "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOWEXT }, .unit = "flags" },
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{ "cmov", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV }, .unit = "flags" },
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#elif ARCH_ARM
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{ "armv5te", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV5TE }, .unit = "flags" },
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{ "armv6", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6 }, .unit = "flags" },
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{ "armv6t2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6T2 }, .unit = "flags" },
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{ "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
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{ "vfp_vm", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP_VM }, .unit = "flags" },
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{ "vfpv3", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFPV3 }, .unit = "flags" },
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{ "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
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#elif ARCH_AARCH64
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{ "armv8", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV8 }, .unit = "flags" },
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{ "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
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{ "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
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#endif
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{ NULL },
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};
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static const AVClass class = {
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.class_name = "cpuflags",
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.item_name = av_default_item_name,
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.option = cpuflags_opts,
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.version = LIBAVUTIL_VERSION_INT,
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};
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int flags = 0, ret;
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const AVClass *pclass = &class;
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if ((ret = av_opt_eval_flags(&pclass, &cpuflags_opts[0], s, &flags)) < 0)
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return ret;
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return flags & INT_MAX;
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}
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int av_cpu_count(void)
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{
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int nb_cpus = 1;
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#if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
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cpu_set_t cpuset;
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CPU_ZERO(&cpuset);
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if (!sched_getaffinity(0, sizeof(cpuset), &cpuset))
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nb_cpus = CPU_COUNT(&cpuset);
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#elif HAVE_GETPROCESSAFFINITYMASK
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DWORD_PTR proc_aff, sys_aff;
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if (GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff))
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nb_cpus = av_popcount64(proc_aff);
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#elif HAVE_SYSCTL && defined(HW_NCPU)
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int mib[2] = { CTL_HW, HW_NCPU };
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size_t len = sizeof(nb_cpus);
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if (sysctl(mib, 2, &nb_cpus, &len, NULL, 0) == -1)
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nb_cpus = 0;
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#elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
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nb_cpus = sysconf(_SC_NPROC_ONLN);
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#elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
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nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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#endif
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return nb_cpus;
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}
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size_t av_cpu_max_align(void)
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{
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int flags = av_get_cpu_flags();
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if (flags & AV_CPU_FLAG_AVX)
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return 32;
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if (flags & (AV_CPU_FLAG_ALTIVEC | AV_CPU_FLAG_SSE | AV_CPU_FLAG_NEON))
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return 16;
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return 8;
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}
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