Merge pull request electro-smith#103 from andrewikenberry/delayline_template

Delayline template

Author: stephenhensley

daisysp/Makefile

@@ -6,7 +6,6 @@ adenv \
 crossfade \
 dcblock \
 decimator \
-delayline \
 line \
 nlfilt \
 metro \
@@ -17,6 +16,7 @@ reverbsc \
 svf \
 
 # certain modules are only header files:
+# delayline 
 # whitenoise
 
 # TODO: Consider making this work for PCs as well?

daisysp/daisysp.h

@@ -34,7 +34,6 @@ typedef struct {
 #include "modules/crossfade.h"
 #include "modules/dcblock.h"
 #include "modules/decimator.h"
-#include "modules/delayline.h"
 #include "modules/line.h"
 #include "modules/nlfilt.h"
 #include "modules/metro.h"
@@ -44,6 +43,7 @@ typedef struct {
 #ifdef __cplusplus
 }
 
+#include "modules/delayline.h"
 #include "modules/reverbsc.h"
 #include "modules/whitenoise.h"
 #include "modules/svf.h"

daisysp/daisysp.vcxproj

@@ -95,7 +95,6 @@
     <ClCompile Include="modules\crossfade.c" />
     <ClCompile Include="modules\dcblock.c" />
     <ClCompile Include="modules\decimator.cpp" />
-    <ClCompile Include="modules\delayline.c" />
     <ClCompile Include="modules\line.cpp" />
     <ClCompile Include="modules\metro.c" />
     <ClCompile Include="modules\nlfilt.c" />

daisysp/modules/delayline.c

@@ -1,36 +1,71 @@
 // Simple Delay Line
+//
 // November 2019
-// By: shensley
 //
-// User manages their own buffer in order to provide 
-//     flexibility without dynamic memory.
+// Converted to Template December 2019
+//
+// By: shensley
 //
-// TODO: add some sort of type flexibility -- for now its just floats.
 #pragma once
 #ifndef DSY_DELAY_H
 #define DSY_DELAY_H
-#ifdef __cplusplus
-extern "C" {
-#endif
-#include <stdint.h>
 #include <stdlib.h>
-
-typedef struct
+#include <stdint.h>
+namespace daisysp
 {
-	uint8_t interp;		
-	size_t write_ptr, delay, size;
-	float delay_frac, delay_sec, sr;
-	float *line;
-}dsy_delayline;
-
-void dsy_delay_init(dsy_delayline *p, float* buff, size_t buff_size, float samplerate);
-void dsy_delay_reset(dsy_delayline *p);
-void dsy_delay_set_delay_samps(dsy_delayline *p, size_t size);
-void dsy_delay_set_delay_sec(dsy_delayline *p, float sec);
-void dsy_delay_line_write(dsy_delayline *p, float val);
-float dsy_delay_line_read(dsy_delayline *p);
-
-#ifdef __cplusplus
-}
-#endif
+template<typename T, size_t max_size>
+class delayline
+{
+    public:
+    delayline() { }
+    ~delayline() { }
+
+    void init()
+    {
+        reset();
+    }
+
+    void reset() {
+        for (size_t i = 0; i < max_size; i++)
+        {
+            line_[i] = T(0);
+        }
+        write_ptr_ = 0;
+        delay_ = 1;
+    }
+
+    inline void set_delay(size_t delay)
+    {
+        frac_ = 0.0f;
+        delay_ = delay < max_size ? delay : max_size - 1;
+    }
+
+    inline void set_delay(float delay)
+    {
+        int32_t int_delay = static_cast<int32_t>(delay);
+        frac_ = delay - static_cast<float>(int_delay);
+        delay_ = int_delay < max_size ? int_delay : max_size - 1;
+    }
+
+    inline void write(const T sample) 
+    {
+        line_[write_ptr_] = sample;
+        write_ptr_ = (write_ptr_ - 1 + max_size) % max_size;
+    }
+
+    inline const T read() const
+    {
+        T a = line_[(write_ptr_ + delay_) % max_size];
+        T b = line_[(write_ptr_ + delay_ + 1) % max_size];
+        return a + (b - a) * frac_;
+    }
+
+    private:
+    float frac_;
+    size_t write_ptr_;
+    size_t delay_;
+    T line_[max_size];
+
+};
+} // namespace daisysp
 #endif