2 * This file is part of FFmpeg.
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.
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.
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
21 #include <stdatomic.h>
23 #include "attributes.h"
25 #include "cpu_internal.h"
30 #if HAVE_SCHED_GETAFFINITY
36 #if HAVE_GETPROCESSAFFINITYMASK || HAVE_WINRT
41 #include <sys/param.h>
43 #include <sys/types.h>
44 #include <sys/sysctl.h>
50 static atomic_int cpu_flags = ATOMIC_VAR_INIT(-1);
52 static int get_cpu_flags(void)
55 return ff_get_cpu_flags_mips();
57 return ff_get_cpu_flags_aarch64();
59 return ff_get_cpu_flags_arm();
61 return ff_get_cpu_flags_ppc();
63 return ff_get_cpu_flags_x86();
67 void av_force_cpu_flags(int arg){
69 (arg & ( AV_CPU_FLAG_3DNOW |
70 AV_CPU_FLAG_3DNOWEXT |
74 AV_CPU_FLAG_SSE2SLOW |
76 AV_CPU_FLAG_SSE3SLOW |
87 && !(arg & AV_CPU_FLAG_MMX)) {
88 av_log(NULL, AV_LOG_WARNING, "MMX implied by specified flags\n");
89 arg |= AV_CPU_FLAG_MMX;
92 atomic_store_explicit(&cpu_flags, arg, memory_order_relaxed);
95 int av_get_cpu_flags(void)
97 int flags = atomic_load_explicit(&cpu_flags, memory_order_relaxed);
99 flags = get_cpu_flags();
100 atomic_store_explicit(&cpu_flags, flags, memory_order_relaxed);
105 int av_parse_cpu_caps(unsigned *flags, const char *s)
107 static const AVOption cpuflags_opts[] = {
108 { "flags" , NULL, 0, AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT64_MIN, INT64_MAX, .unit = "flags" },
110 { "altivec" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ALTIVEC }, .unit = "flags" },
112 { "mmx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX }, .unit = "flags" },
113 { "mmx2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX2 }, .unit = "flags" },
114 { "mmxext" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX2 }, .unit = "flags" },
115 { "sse" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE }, .unit = "flags" },
116 { "sse2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE2 }, .unit = "flags" },
117 { "sse2slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE2SLOW }, .unit = "flags" },
118 { "sse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE3 }, .unit = "flags" },
119 { "sse3slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE3SLOW }, .unit = "flags" },
120 { "ssse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSSE3 }, .unit = "flags" },
121 { "atom" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ATOM }, .unit = "flags" },
122 { "sse4.1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE4 }, .unit = "flags" },
123 { "sse4.2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE42 }, .unit = "flags" },
124 { "avx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX }, .unit = "flags" },
125 { "avxslow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVXSLOW }, .unit = "flags" },
126 { "xop" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_XOP }, .unit = "flags" },
127 { "fma3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_FMA3 }, .unit = "flags" },
128 { "fma4" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_FMA4 }, .unit = "flags" },
129 { "avx2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX2 }, .unit = "flags" },
130 { "bmi1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI1 }, .unit = "flags" },
131 { "bmi2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI2 }, .unit = "flags" },
132 { "3dnow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOW }, .unit = "flags" },
133 { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOWEXT }, .unit = "flags" },
134 { "cmov", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV }, .unit = "flags" },
135 { "aesni", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AESNI }, .unit = "flags" },
136 { "avx512" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX512 }, .unit = "flags" },
138 #define CPU_FLAG_P2 AV_CPU_FLAG_CMOV | AV_CPU_FLAG_MMX
139 #define CPU_FLAG_P3 CPU_FLAG_P2 | AV_CPU_FLAG_MMX2 | AV_CPU_FLAG_SSE
140 #define CPU_FLAG_P4 CPU_FLAG_P3| AV_CPU_FLAG_SSE2
141 { "pentium2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P2 }, .unit = "flags" },
142 { "pentium3", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P3 }, .unit = "flags" },
143 { "pentium4", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P4 }, .unit = "flags" },
145 #define CPU_FLAG_K62 AV_CPU_FLAG_MMX | AV_CPU_FLAG_3DNOW
146 #define CPU_FLAG_ATHLON CPU_FLAG_K62 | AV_CPU_FLAG_CMOV | AV_CPU_FLAG_3DNOWEXT | AV_CPU_FLAG_MMX2
147 #define CPU_FLAG_ATHLONXP CPU_FLAG_ATHLON | AV_CPU_FLAG_SSE
148 #define CPU_FLAG_K8 CPU_FLAG_ATHLONXP | AV_CPU_FLAG_SSE2
149 { "k6", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX }, .unit = "flags" },
150 { "k62", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_K62 }, .unit = "flags" },
151 { "athlon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_ATHLON }, .unit = "flags" },
152 { "athlonxp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_ATHLONXP }, .unit = "flags" },
153 { "k8", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_K8 }, .unit = "flags" },
155 { "armv5te", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV5TE }, .unit = "flags" },
156 { "armv6", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6 }, .unit = "flags" },
157 { "armv6t2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6T2 }, .unit = "flags" },
158 { "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
159 { "vfp_vm", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP_VM }, .unit = "flags" },
160 { "vfpv3", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFPV3 }, .unit = "flags" },
161 { "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
162 { "setend", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SETEND }, .unit = "flags" },
164 { "armv8", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV8 }, .unit = "flags" },
165 { "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
166 { "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
168 { "mmi", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMI }, .unit = "flags" },
169 { "msa", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MSA }, .unit = "flags" },
173 static const AVClass class = {
174 .class_name = "cpuflags",
175 .item_name = av_default_item_name,
176 .option = cpuflags_opts,
177 .version = LIBAVUTIL_VERSION_INT,
179 const AVClass *pclass = &class;
181 return av_opt_eval_flags(&pclass, &cpuflags_opts[0], s, flags);
184 int av_cpu_count(void)
186 static atomic_int printed = ATOMIC_VAR_INIT(0);
192 #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
197 if (!sched_getaffinity(0, sizeof(cpuset), &cpuset))
198 nb_cpus = CPU_COUNT(&cpuset);
199 #elif HAVE_GETPROCESSAFFINITYMASK
200 DWORD_PTR proc_aff, sys_aff;
201 if (GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff))
202 nb_cpus = av_popcount64(proc_aff);
203 #elif HAVE_SYSCTL && defined(HW_NCPUONLINE)
204 int mib[2] = { CTL_HW, HW_NCPUONLINE };
205 size_t len = sizeof(nb_cpus);
207 if (sysctl(mib, 2, &nb_cpus, &len, NULL, 0) == -1)
209 #elif HAVE_SYSCTL && defined(HW_NCPU)
210 int mib[2] = { CTL_HW, HW_NCPU };
211 size_t len = sizeof(nb_cpus);
213 if (sysctl(mib, 2, &nb_cpus, &len, NULL, 0) == -1)
215 #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
216 nb_cpus = sysconf(_SC_NPROC_ONLN);
217 #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
218 nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
220 GetNativeSystemInfo(&sysinfo);
221 nb_cpus = sysinfo.dwNumberOfProcessors;
224 if (!atomic_exchange_explicit(&printed, 1, memory_order_relaxed))
225 av_log(NULL, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
230 size_t av_cpu_max_align(void)
233 return ff_get_cpu_max_align_mips();
235 return ff_get_cpu_max_align_aarch64();
237 return ff_get_cpu_max_align_arm();
239 return ff_get_cpu_max_align_ppc();
241 return ff_get_cpu_max_align_x86();