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Diffstat (limited to '')
| -rw-r--r-- | media/ffvpx/libavutil/arm/cpu.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/arm/cpu.c b/media/ffvpx/libavutil/arm/cpu.c new file mode 100644 index 0000000000..c84a655c37 --- /dev/null +++ b/media/ffvpx/libavutil/arm/cpu.c @@ -0,0 +1,188 @@ +/* + * 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 "libavutil/cpu.h" +#include "libavutil/cpu_internal.h" +#include "config.h" + +#define CORE_FLAG(f) \ + (AV_CPU_FLAG_ ## f * (HAVE_ ## f ## _EXTERNAL || HAVE_ ## f ## _INLINE)) + +#define CORE_CPU_FLAGS \ + (CORE_FLAG(ARMV5TE) | \ + CORE_FLAG(ARMV6) | \ + CORE_FLAG(ARMV6T2) | \ + CORE_FLAG(VFP) | \ + CORE_FLAG(VFPV3) | \ + CORE_FLAG(NEON)) + +#if defined __linux__ || defined __ANDROID__ + +#include <stdint.h> +#include <stdio.h> +#include <string.h> +#include "libavutil/avstring.h" + +#if HAVE_GETAUXVAL +#include <sys/auxv.h> +#endif + +#define AT_HWCAP 16 + +/* Relevant HWCAP values from kernel headers */ +#define HWCAP_VFP (1 << 6) +#define HWCAP_EDSP (1 << 7) +#define HWCAP_THUMBEE (1 << 11) +#define HWCAP_NEON (1 << 12) +#define HWCAP_VFPv3 (1 << 13) +#define HWCAP_TLS (1 << 15) + +static int get_auxval(uint32_t *hwcap) +{ +#if HAVE_GETAUXVAL + unsigned long ret = getauxval(AT_HWCAP); + if (ret == 0) + return -1; + *hwcap = ret; + return 0; +#else + return -1; +#endif +} + +static int get_hwcap(uint32_t *hwcap) +{ + struct { uint32_t a_type; uint32_t a_val; } auxv; + FILE *f = fopen("/proc/self/auxv", "r"); + int err = -1; + + if (!f) + return -1; + + while (fread(&auxv, sizeof(auxv), 1, f) > 0) { + if (auxv.a_type == AT_HWCAP) { + *hwcap = auxv.a_val; + err = 0; + break; + } + } + + fclose(f); + return err; +} + +static int get_cpuinfo(uint32_t *hwcap) +{ + FILE *f = fopen("/proc/cpuinfo", "r"); + char buf[200]; + + if (!f) + return -1; + + *hwcap = 0; + while (fgets(buf, sizeof(buf), f)) { + if (av_strstart(buf, "Features", NULL)) { + if (strstr(buf, " edsp ")) + *hwcap |= HWCAP_EDSP; + if (strstr(buf, " tls ")) + *hwcap |= HWCAP_TLS; + if (strstr(buf, " thumbee ")) + *hwcap |= HWCAP_THUMBEE; + if (strstr(buf, " vfp ")) + *hwcap |= HWCAP_VFP; + if (strstr(buf, " vfpv3 ")) + *hwcap |= HWCAP_VFPv3; + if (strstr(buf, " neon ") || strstr(buf, " asimd ")) + *hwcap |= HWCAP_NEON; + if (strstr(buf, " fp ")) // Listed on 64 bit ARMv8 kernels + *hwcap |= HWCAP_VFP | HWCAP_VFPv3; + break; + } + } + fclose(f); + return 0; +} + +int ff_get_cpu_flags_arm(void) +{ + int flags = CORE_CPU_FLAGS; + uint32_t hwcap; + + if (get_auxval(&hwcap) < 0) + if (get_hwcap(&hwcap) < 0) + if (get_cpuinfo(&hwcap) < 0) + return flags; + +#define check_cap(cap, flag) do { \ + if (hwcap & HWCAP_ ## cap) \ + flags |= AV_CPU_FLAG_ ## flag; \ + } while (0) + + /* No flags explicitly indicate v6 or v6T2 so check others which + imply support. */ + check_cap(EDSP, ARMV5TE); + check_cap(TLS, ARMV6); + check_cap(THUMBEE, ARMV6T2); + check_cap(VFP, VFP); + check_cap(VFPv3, VFPV3); + check_cap(NEON, NEON); + + /* The v6 checks above are not reliable so let higher flags + trickle down. */ + if (flags & (AV_CPU_FLAG_VFPV3 | AV_CPU_FLAG_NEON)) + flags |= AV_CPU_FLAG_ARMV6T2; + else if (flags & (AV_CPU_FLAG_ARMV6T2 | AV_CPU_FLAG_ARMV6)) + /* Some functions use the 'setend' instruction which is deprecated on ARMv8 + * and serializing on some ARMv7 cores. This ensures such functions + * are only enabled on ARMv6. */ + flags |= AV_CPU_FLAG_SETEND; + + if (flags & AV_CPU_FLAG_ARMV6T2) + flags |= AV_CPU_FLAG_ARMV6; + + /* set the virtual VFPv2 vector mode flag */ + if ((flags & AV_CPU_FLAG_VFP) && !(flags & (AV_CPU_FLAG_VFPV3 | AV_CPU_FLAG_NEON))) + flags |= AV_CPU_FLAG_VFP_VM; + + return flags; +} + +#else + +int ff_get_cpu_flags_arm(void) +{ + return AV_CPU_FLAG_ARMV5TE * HAVE_ARMV5TE | + AV_CPU_FLAG_ARMV6 * HAVE_ARMV6 | + AV_CPU_FLAG_ARMV6T2 * HAVE_ARMV6T2 | + AV_CPU_FLAG_VFP * HAVE_VFP | + AV_CPU_FLAG_VFPV3 * HAVE_VFPV3 | + AV_CPU_FLAG_NEON * HAVE_NEON | + AV_CPU_FLAG_SETEND * !(HAVE_NEON | HAVE_VFPV3); +} + +#endif + +size_t ff_get_cpu_max_align_arm(void) +{ + int flags = av_get_cpu_flags(); + + if (flags & AV_CPU_FLAG_NEON) + return 16; + + return 8; +} |