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-rw-r--r--media/ffvpx/libavutil/arm/cpu.c188
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;
+}