[FFmpeg-devel] [PATCH] avutil: use getauxval on linux/android for CPU capabilities

[Aman Karmani <ffmpeg@tmm1.net>]

From: Aman Karmani <aman@tmm1.net>

fixes #6578

Signed-off-by: Aman Karmani <aman@tmm1.net>
---
 libavutil/arm/cpu.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/libavutil/arm/cpu.c b/libavutil/arm/cpu.c
index 81e85e2525..983e5a4d83 100644
--- a/libavutil/arm/cpu.c
+++ b/libavutil/arm/cpu.c
@@ -36,6 +36,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>
+#include <sys/auxv.h>
 #include "libavutil/avstring.h"
 
 #define AT_HWCAP        16
@@ -48,6 +49,15 @@
 #define HWCAP_VFPv3     (1 << 13)
 #define HWCAP_TLS       (1 << 15)
 
+static int get_auxval(uint32_t *hwcap)
+{
+    unsigned long ret = getauxval(AT_HWCAP);
+    if (ret == 0)
+        return -1;
+    *hwcap = ret;
+    return 0;
+}
+
 static int get_hwcap(uint32_t *hwcap)
 {
     struct { uint32_t a_type; uint32_t a_val; } auxv;
@@ -106,9 +116,10 @@ int ff_get_cpu_flags_arm(void)
     int flags = CORE_CPU_FLAGS;
     uint32_t hwcap;
 
-    if (get_hwcap(&hwcap) < 0)
-        if (get_cpuinfo(&hwcap) < 0)
-            return flags;
+    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)              \
-- 
2.33.0

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