add fmdsp fft analyzer

1 files changed, 44 insertions, 0 deletions

diff --git a/fmdsp/fmdsp_platform_unix.c b/fmdsp/fmdsp_platform_unix.c
new file mode 100644
index 0000000..446cee7
--- /dev/null
+++ b/fmdsp/fmdsp_platform_unix.c
@@ -0,0 +1,44 @@
+#include "fmdsp_platform_info.h"
+#include <sys/times.h>
+#include <time.h>
+#include <limits.h>
+#include <stdint.h>
+
+static struct {
+  clock_t lastall;
+  clock_t lastcpu;
+  struct timespec lasttimespec;
+} g;
+
+int fmdsp_cpu_usage(void) {
+  struct tms tmsbuf;
+  clock_t all = times(&tmsbuf);
+  clock_t cpu = tmsbuf.tms_utime + tmsbuf.tms_stime;
+  clock_t percentage = 0;
+  clock_t alld = all - g.lastall;
+  clock_t cpud = cpu - g.lastcpu;
+  if (alld) percentage = cpud * 100 / alld;
+  g.lastall = all;
+  g.lastcpu = cpu;
+  if (!g.lastall) percentage = 0;
+  if (percentage > INT_MAX) percentage = INT_MAX;
+  if (percentage < 0) percentage = 0;
+  return percentage;
+}
+
+int fmdsp_fps_30(void) {
+  struct timespec time;
+  clock_gettime(CLOCK_MONOTONIC, &time);
+  uint64_t fps = 0;
+  if (g.lasttimespec.tv_sec || g.lasttimespec.tv_nsec) {
+    uint64_t diffns = time.tv_sec - g.lasttimespec.tv_sec;
+    diffns *= 1000000000ull;
+    diffns += time.tv_nsec - g.lasttimespec.tv_nsec;
+    if (diffns) {
+      fps = 30ull * 1000000000ull / diffns;
+    }
+  }
+  g.lasttimespec = time;
+  if (fps > INT_MAX) fps = INT_MAX;
+  return fps;
+}