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 <stddef.h>
20 #include <stdint.h>
21 #include <stdatomic.h>
22
23 #include "attributes.h"
24 #include "cpu.h"
25 #include "cpu_internal.h"
26 #include "config.h"
27 #include "opt.h"
28 #include "common.h"
29
30 #if HAVE_SCHED_GETAFFINITY
31 #ifndef _GNU_SOURCE
32 # define _GNU_SOURCE
33 #endif
34 #include <sched.h>
35 #endif
36 #if HAVE_GETPROCESSAFFINITYMASK || HAVE_WINRT
37 #include <windows.h>
38 #endif
39 #if HAVE_SYSCTL
40 #if HAVE_SYS_PARAM_H
41 #include <sys/param.h>
42 #endif
43 #include <sys/types.h>
44 #include <sys/sysctl.h>
45 #endif
46 #if HAVE_UNISTD_H
47 #include <unistd.h>
48 #endif
49
50 static atomic_int cpu_flags = ATOMIC_VAR_INIT(-1);
51
get_cpu_flags(void)52 static int get_cpu_flags(void)
53 {
54 if (ARCH_MIPS)
55 return ff_get_cpu_flags_mips();
56 if (ARCH_AARCH64)
57 return ff_get_cpu_flags_aarch64();
58 if (ARCH_ARM)
59 return ff_get_cpu_flags_arm();
60 if (ARCH_PPC)
61 return ff_get_cpu_flags_ppc();
62 if (ARCH_X86)
63 return ff_get_cpu_flags_x86();
64 return 0;
65 }
66
av_force_cpu_flags(int arg)67 void av_force_cpu_flags(int arg){
68 if (ARCH_X86 &&
69 (arg & ( AV_CPU_FLAG_3DNOW |
70 AV_CPU_FLAG_3DNOWEXT |
71 AV_CPU_FLAG_MMXEXT |
72 AV_CPU_FLAG_SSE |
73 AV_CPU_FLAG_SSE2 |
74 AV_CPU_FLAG_SSE2SLOW |
75 AV_CPU_FLAG_SSE3 |
76 AV_CPU_FLAG_SSE3SLOW |
77 AV_CPU_FLAG_SSSE3 |
78 AV_CPU_FLAG_SSE4 |
79 AV_CPU_FLAG_SSE42 |
80 AV_CPU_FLAG_AVX |
81 AV_CPU_FLAG_AVXSLOW |
82 AV_CPU_FLAG_XOP |
83 AV_CPU_FLAG_FMA3 |
84 AV_CPU_FLAG_FMA4 |
85 AV_CPU_FLAG_AVX2 |
86 AV_CPU_FLAG_AVX512 ))
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;
90 }
91
92 atomic_store_explicit(&cpu_flags, arg, memory_order_relaxed);
93 }
94
av_get_cpu_flags(void)95 int av_get_cpu_flags(void)
96 {
97 int flags = atomic_load_explicit(&cpu_flags, memory_order_relaxed);
98 if (flags == -1) {
99 flags = get_cpu_flags();
100 atomic_store_explicit(&cpu_flags, flags, memory_order_relaxed);
101 }
102 return flags;
103 }
104
av_set_cpu_flags_mask(int mask)105 void av_set_cpu_flags_mask(int mask)
106 {
107 atomic_store_explicit(&cpu_flags, get_cpu_flags() & mask,
108 memory_order_relaxed);
109 }
110
av_parse_cpu_flags(const char * s)111 int av_parse_cpu_flags(const char *s)
112 {
113 #define CPUFLAG_MMXEXT (AV_CPU_FLAG_MMX | AV_CPU_FLAG_MMXEXT | AV_CPU_FLAG_CMOV)
114 #define CPUFLAG_3DNOW (AV_CPU_FLAG_3DNOW | AV_CPU_FLAG_MMX)
115 #define CPUFLAG_3DNOWEXT (AV_CPU_FLAG_3DNOWEXT | CPUFLAG_3DNOW)
116 #define CPUFLAG_SSE (AV_CPU_FLAG_SSE | CPUFLAG_MMXEXT)
117 #define CPUFLAG_SSE2 (AV_CPU_FLAG_SSE2 | CPUFLAG_SSE)
118 #define CPUFLAG_SSE2SLOW (AV_CPU_FLAG_SSE2SLOW | CPUFLAG_SSE2)
119 #define CPUFLAG_SSE3 (AV_CPU_FLAG_SSE3 | CPUFLAG_SSE2)
120 #define CPUFLAG_SSE3SLOW (AV_CPU_FLAG_SSE3SLOW | CPUFLAG_SSE3)
121 #define CPUFLAG_SSSE3 (AV_CPU_FLAG_SSSE3 | CPUFLAG_SSE3)
122 #define CPUFLAG_SSE4 (AV_CPU_FLAG_SSE4 | CPUFLAG_SSSE3)
123 #define CPUFLAG_SSE42 (AV_CPU_FLAG_SSE42 | CPUFLAG_SSE4)
124 #define CPUFLAG_AVX (AV_CPU_FLAG_AVX | CPUFLAG_SSE42)
125 #define CPUFLAG_AVXSLOW (AV_CPU_FLAG_AVXSLOW | CPUFLAG_AVX)
126 #define CPUFLAG_XOP (AV_CPU_FLAG_XOP | CPUFLAG_AVX)
127 #define CPUFLAG_FMA3 (AV_CPU_FLAG_FMA3 | CPUFLAG_AVX)
128 #define CPUFLAG_FMA4 (AV_CPU_FLAG_FMA4 | CPUFLAG_AVX)
129 #define CPUFLAG_AVX2 (AV_CPU_FLAG_AVX2 | CPUFLAG_AVX)
130 #define CPUFLAG_BMI2 (AV_CPU_FLAG_BMI2 | AV_CPU_FLAG_BMI1)
131 #define CPUFLAG_AESNI (AV_CPU_FLAG_AESNI | CPUFLAG_SSE42)
132 #define CPUFLAG_AVX512 (AV_CPU_FLAG_AVX512 | CPUFLAG_AVX2)
133 static const AVOption cpuflags_opts[] = {
134 { "flags" , NULL, 0, AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT64_MIN, INT64_MAX, .unit = "flags" },
135 #if ARCH_PPC
136 { "altivec" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ALTIVEC }, .unit = "flags" },
137 #elif ARCH_X86
138 { "mmx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX }, .unit = "flags" },
139 { "mmxext" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_MMXEXT }, .unit = "flags" },
140 { "sse" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE }, .unit = "flags" },
141 { "sse2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE2 }, .unit = "flags" },
142 { "sse2slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE2SLOW }, .unit = "flags" },
143 { "sse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE3 }, .unit = "flags" },
144 { "sse3slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE3SLOW }, .unit = "flags" },
145 { "ssse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSSE3 }, .unit = "flags" },
146 { "atom" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ATOM }, .unit = "flags" },
147 { "sse4.1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE4 }, .unit = "flags" },
148 { "sse4.2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_SSE42 }, .unit = "flags" },
149 { "avx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX }, .unit = "flags" },
150 { "avxslow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVXSLOW }, .unit = "flags" },
151 { "xop" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_XOP }, .unit = "flags" },
152 { "fma3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA3 }, .unit = "flags" },
153 { "fma4" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA4 }, .unit = "flags" },
154 { "avx2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX2 }, .unit = "flags" },
155 { "bmi1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI1 }, .unit = "flags" },
156 { "bmi2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_BMI2 }, .unit = "flags" },
157 { "3dnow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOW }, .unit = "flags" },
158 { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOWEXT }, .unit = "flags" },
159 { "cmov", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV }, .unit = "flags" },
160 { "aesni" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AESNI }, .unit = "flags" },
161 { "avx512" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX512 }, .unit = "flags" },
162 #elif ARCH_ARM
163 { "armv5te", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV5TE }, .unit = "flags" },
164 { "armv6", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6 }, .unit = "flags" },
165 { "armv6t2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6T2 }, .unit = "flags" },
166 { "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
167 { "vfp_vm", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP_VM }, .unit = "flags" },
168 { "vfpv3", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFPV3 }, .unit = "flags" },
169 { "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
170 #elif ARCH_AARCH64
171 { "armv8", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV8 }, .unit = "flags" },
172 { "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
173 { "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
174 #elif ARCH_MIPS
175 { "mmi", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMI }, .unit = "flags" },
176 { "msa", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MSA }, .unit = "flags" },
177 #endif
178 { NULL },
179 };
180 static const AVClass class = {
181 .class_name = "cpuflags",
182 .item_name = av_default_item_name,
183 .option = cpuflags_opts,
184 .version = LIBAVUTIL_VERSION_INT,
185 };
186
187 int flags = 0, ret;
188 const AVClass *pclass = &class;
189
190 if ((ret = av_opt_eval_flags(&pclass, &cpuflags_opts[0], s, &flags)) < 0)
191 return ret;
192
193 return flags & INT_MAX;
194 }
195
av_parse_cpu_caps(unsigned * flags,const char * s)196 int av_parse_cpu_caps(unsigned *flags, const char *s)
197 {
198 static const AVOption cpuflags_opts[] = {
199 { "flags" , NULL, 0, AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT64_MIN, INT64_MAX, .unit = "flags" },
200 #if ARCH_PPC
201 { "altivec" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ALTIVEC }, .unit = "flags" },
202 #elif ARCH_X86
203 { "mmx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX }, .unit = "flags" },
204 { "mmx2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX2 }, .unit = "flags" },
205 { "mmxext" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX2 }, .unit = "flags" },
206 { "sse" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE }, .unit = "flags" },
207 { "sse2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE2 }, .unit = "flags" },
208 { "sse2slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE2SLOW }, .unit = "flags" },
209 { "sse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE3 }, .unit = "flags" },
210 { "sse3slow", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE3SLOW }, .unit = "flags" },
211 { "ssse3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSSE3 }, .unit = "flags" },
212 { "atom" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ATOM }, .unit = "flags" },
213 { "sse4.1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE4 }, .unit = "flags" },
214 { "sse4.2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SSE42 }, .unit = "flags" },
215 { "avx" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX }, .unit = "flags" },
216 { "avxslow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVXSLOW }, .unit = "flags" },
217 { "xop" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_XOP }, .unit = "flags" },
218 { "fma3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_FMA3 }, .unit = "flags" },
219 { "fma4" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_FMA4 }, .unit = "flags" },
220 { "avx2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX2 }, .unit = "flags" },
221 { "bmi1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI1 }, .unit = "flags" },
222 { "bmi2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_BMI2 }, .unit = "flags" },
223 { "3dnow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOW }, .unit = "flags" },
224 { "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_3DNOWEXT }, .unit = "flags" },
225 { "cmov", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV }, .unit = "flags" },
226 { "aesni", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AESNI }, .unit = "flags" },
227 { "avx512" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_AVX512 }, .unit = "flags" },
228
229 #define CPU_FLAG_P2 AV_CPU_FLAG_CMOV | AV_CPU_FLAG_MMX
230 #define CPU_FLAG_P3 CPU_FLAG_P2 | AV_CPU_FLAG_MMX2 | AV_CPU_FLAG_SSE
231 #define CPU_FLAG_P4 CPU_FLAG_P3| AV_CPU_FLAG_SSE2
232 { "pentium2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P2 }, .unit = "flags" },
233 { "pentium3", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P3 }, .unit = "flags" },
234 { "pentium4", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_P4 }, .unit = "flags" },
235
236 #define CPU_FLAG_K62 AV_CPU_FLAG_MMX | AV_CPU_FLAG_3DNOW
237 #define CPU_FLAG_ATHLON CPU_FLAG_K62 | AV_CPU_FLAG_CMOV | AV_CPU_FLAG_3DNOWEXT | AV_CPU_FLAG_MMX2
238 #define CPU_FLAG_ATHLONXP CPU_FLAG_ATHLON | AV_CPU_FLAG_SSE
239 #define CPU_FLAG_K8 CPU_FLAG_ATHLONXP | AV_CPU_FLAG_SSE2
240 { "k6", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMX }, .unit = "flags" },
241 { "k62", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_K62 }, .unit = "flags" },
242 { "athlon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_ATHLON }, .unit = "flags" },
243 { "athlonxp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_ATHLONXP }, .unit = "flags" },
244 { "k8", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPU_FLAG_K8 }, .unit = "flags" },
245 #elif ARCH_ARM
246 { "armv5te", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV5TE }, .unit = "flags" },
247 { "armv6", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6 }, .unit = "flags" },
248 { "armv6t2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV6T2 }, .unit = "flags" },
249 { "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
250 { "vfp_vm", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP_VM }, .unit = "flags" },
251 { "vfpv3", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFPV3 }, .unit = "flags" },
252 { "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
253 { "setend", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_SETEND }, .unit = "flags" },
254 #elif ARCH_AARCH64
255 { "armv8", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_ARMV8 }, .unit = "flags" },
256 { "neon", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_NEON }, .unit = "flags" },
257 { "vfp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_VFP }, .unit = "flags" },
258 #elif ARCH_MIPS
259 { "mmi", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MMI }, .unit = "flags" },
260 { "msa", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_MSA }, .unit = "flags" },
261 #endif
262 { NULL },
263 };
264 static const AVClass class = {
265 .class_name = "cpuflags",
266 .item_name = av_default_item_name,
267 .option = cpuflags_opts,
268 .version = LIBAVUTIL_VERSION_INT,
269 };
270 const AVClass *pclass = &class;
271
272 return av_opt_eval_flags(&pclass, &cpuflags_opts[0], s, flags);
273 }
274
av_cpu_count(void)275 int av_cpu_count(void)
276 {
277 static volatile int printed;
278
279 int nb_cpus = 1;
280 #if HAVE_WINRT
281 SYSTEM_INFO sysinfo;
282 #endif
283 #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
284 cpu_set_t cpuset;
285
286 CPU_ZERO(&cpuset);
287
288 if (!sched_getaffinity(0, sizeof(cpuset), &cpuset))
289 nb_cpus = CPU_COUNT(&cpuset);
290 #elif HAVE_GETPROCESSAFFINITYMASK
291 DWORD_PTR proc_aff, sys_aff;
292 if (GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff))
293 nb_cpus = av_popcount64(proc_aff);
294 #elif HAVE_SYSCTL && defined(HW_NCPUONLINE)
295 int mib[2] = { CTL_HW, HW_NCPUONLINE };
296 size_t len = sizeof(nb_cpus);
297
298 if (sysctl(mib, 2, &nb_cpus, &len, NULL, 0) == -1)
299 nb_cpus = 0;
300 #elif HAVE_SYSCTL && defined(HW_NCPU)
301 int mib[2] = { CTL_HW, HW_NCPU };
302 size_t len = sizeof(nb_cpus);
303
304 if (sysctl(mib, 2, &nb_cpus, &len, NULL, 0) == -1)
305 nb_cpus = 0;
306 #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
307 nb_cpus = sysconf(_SC_NPROC_ONLN);
308 #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
309 nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
310 #elif HAVE_WINRT
311 GetNativeSystemInfo(&sysinfo);
312 nb_cpus = sysinfo.dwNumberOfProcessors;
313 #endif
314
315 if (!printed) {
316 av_log(NULL, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
317 printed = 1;
318 }
319
320 return nb_cpus;
321 }
322
av_cpu_max_align(void)323 size_t av_cpu_max_align(void)
324 {
325 if (ARCH_MIPS)
326 return ff_get_cpu_max_align_mips();
327 if (ARCH_AARCH64)
328 return ff_get_cpu_max_align_aarch64();
329 if (ARCH_ARM)
330 return ff_get_cpu_max_align_arm();
331 if (ARCH_PPC)
332 return ff_get_cpu_max_align_ppc();
333 if (ARCH_X86)
334 return ff_get_cpu_max_align_x86();
335
336 return 8;
337 }
338