Added DaisySP

daisysp/Dynamics/limiter.cpp

@@ -0,0 +1,29 @@
+#include "dsp.h"
+#include "limiter.h"
+
+#define SLOPE(out, in, positive, negative)                \
+    {                                                     \
+        float error = (in)-out;                           \
+        out += (error > 0 ? positive : negative) * error; \
+    }
+
+namespace daisysp
+{
+void Limiter::Init()
+{
+    peak_ = 0.5f;
+}
+
+void Limiter::ProcessBlock(float *in, size_t size, float pre_gain)
+{
+    while(size--)
+    {
+        float pre  = *in * pre_gain;
+        float peak = fabsf(pre);
+        SLOPE(peak_, peak, 0.05f, 0.00002f);
+        float gain = (peak_ <= 1.0f ? 1.0f : 1.0f / peak_);
+        *in++      = SoftLimit(pre * gain * 0.7f);
+    }
+}
+
+} //namespace daisysp