midi cc

1 files changed, 32 insertions, 4 deletions

diff --git a/src/synth_math.h b/src/synth_math.h
index de6fb26..74dec4c 100644
--- a/src/synth_math.h
+++ b/src/synth_math.h
@@ -1,8 +1,10 @@
 #ifndef SYNTH_MATH_H
 #define SYNTH_MATH_H
 
-extern long long
-gcd(long long int a, long long int b)
+#include <stddef.h>
+
+static long long
+gcd(long long a, long long b)
 {
    long long rem;
    rem=a-(a/b*b);
@@ -13,10 +15,36 @@ gcd(long long int a, long long int b)
 }
  
 // Function to return LCM of two numbers
-extern long long
+static long long
 lcm(long long a, long long b)
 {
     return (a / gcd(a, b)) * b;
 }
-  
+
+static float
+clamp(float f)
+{
+  if (f <= -1) return -0.9999;
+  if (f >= 1)  return  0.9999;
+  return f;
+}
+
+/* 1d convolution */
+static void
+convole(float *signal, float *filter,
+        size_t signal_size, size_t filter_size, float *out) {
+  for (size_t i = 0; i < filter_size + signal_size; i++) {
+    size_t kmin, kmax, k;
+    out[i] = 0;
+    /* find overlap */
+    kmin = (i >= filter_size - 1) ? i - (filter_size - 1) : 0;
+    kmax = (i < signal_size - 1) ? i : signal_size - 1;
+
+    /* Add the overlaping values */
+    for (k = kmin; k <= kmax; k++) {
+      out[i] += signal[k] * filter[i - k];
+    }
+  }
+}
+
 #endif /* SYNTH_MATH_H */