SineFromTable - change freq only at 360 degrees

Author: pschatzmann

src/AudioEffects/SoundGenerator.h

@@ -220,7 +220,6 @@ class SineWaveGenerator : public SoundGenerator<T>{
         float m_deltaTime = 0.0;
         float m_phase = 0.0;
         float double_Pi = PI * 2.0;
-        float divisor = 1000000;
 
 
         void logStatus() {
@@ -490,11 +489,14 @@ class SineFromTable  : public SoundGenerator<T> {
             angle += step;
             if (angle >= 360){
                angle -= 360; 
+               // update frequency at start of circle (near 0 degrees)
+               step = step_new;
             }
             return amplitude * interpolate(angle);
         }
 
         bool begin() {
+            is_first = true;
             GeneratorFromArray<float>::begin();
             base_frequency = SoundGenerator<T>::audioInfo().sample_rate / 360.0; //122.5 hz (at 44100); 61 hz (at 22050)
             return true;
@@ -507,14 +509,20 @@ class SineFromTable  : public SoundGenerator<T> {
         }
 
         void setFrequency(float freq) {
-            step = freq / base_frequency;
-            LOGI("step: %f", step);
+            step_new = freq / base_frequency;
+            if (is_first){
+                step = step_new;
+                is_first = false;
+            }
+            LOGI("step: %f", step_new);
         }
 
     protected:
+        bool is_first = true;
         float amplitude;
         float base_frequency;
         float step = 1.0; 
+        float step_new = 1.0; 
         float angle = 0;
         const float values[181] = {0, 0.0174524, 0.0348995, 0.052336, 0.0697565, 0.0871557, 0.104528, 0.121869, 0.139173, 0.156434, 0.173648, 0.190809, 0.207912, 0.224951, 0.241922, 0.258819, 0.275637, 0.292372, 0.309017, 0.325568, 0.34202, 0.358368, 0.374607, 0.390731, 0.406737, 0.422618, 0.438371, 0.45399, 0.469472, 0.48481, 0.5, 0.515038, 0.529919, 0.544639, 0.559193, 0.573576, 0.587785, 0.601815, 0.615661, 0.62932, 0.642788, 0.656059, 0.669131, 0.681998, 0.694658, 0.707107, 0.71934, 0.731354, 0.743145, 0.75471, 0.766044, 0.777146, 0.788011, 0.798636, 0.809017, 0.819152, 0.829038, 0.838671, 0.848048, 0.857167, 0.866025, 0.87462, 0.882948, 0.891007, 0.898794, 0.906308, 0.913545, 0.920505, 0.927184, 0.93358, 0.939693, 0.945519, 0.951057, 0.956305, 0.961262, 0.965926, 0.970296, 0.97437, 0.978148, 0.981627, 0.984808, 0.987688, 0.990268, 0.992546, 0.994522, 0.996195, 0.997564, 0.99863, 0.999391, 0.999848, 1, 0.999848, 0.999391, 0.99863, 0.997564, 0.996195, 0.994522, 0.992546, 0.990268, 0.987688, 0.984808, 0.981627, 0.978148, 0.97437, 0.970296, 0.965926, 0.961262, 0.956305, 0.951057, 0.945519, 0.939693, 0.93358, 0.927184, 0.920505, 0.913545, 0.906308, 0.898794, 0.891007, 0.882948, 0.87462, 0.866025, 0.857167, 0.848048, 0.838671, 0.829038, 0.819152, 0.809017, 0.798636, 0.788011, 0.777146, 0.766044, 0.75471, 0.743145, 0.731354, 0.71934, 0.707107, 0.694658, 0.681998, 0.669131, 0.656059, 0.642788, 0.62932, 0.615661, 0.601815, 0.587785, 0.573576, 0.559193, 0.544639, 0.529919, 0.515038, 0.5, 0.48481, 0.469472, 0.45399, 0.438371, 0.422618, 0.406737, 0.390731, 0.374607, 0.358368, 0.34202, 0.325568, 0.309017, 0.292372, 0.275637, 0.258819, 0.241922, 0.224951, 0.207912, 0.190809, 0.173648, 0.156434, 0.139173, 0.121869, 0.104528, 0.0871557, 0.0697565, 0.052336, 0.0348995, 0.0174524, 0};