Trying to optimize calculations.

PluginFx.cpp

@@ -25,6 +25,7 @@
 #define _USE_MATH_DEFINES
 #include <math.h>
 #include "PluginFx.h"
+#include "synth.h"
 
 const float dc = 1e-18;
 
@@ -48,7 +49,7 @@ inline static float tptlpupw(float & state , float inp , float cutoff , float sr
 //}
 
 static float logsc(float param, const float min, const float max, const float rolloff = 19.0f) {
-  return ((expf(param * logf(rolloff + 1)) - 1.0f) / (rolloff)) * (max - min) + min;
+  return ((EXP_FUNC(param * LOG_FUNC(rolloff + 1)) - 1.0f) / (rolloff)) * (max - min) + min;
 }
 
 PluginFx::PluginFx() {
@@ -67,7 +68,11 @@ void PluginFx::init(int sr) {
 
   sampleRate = sr;
   sampleRateInv = 1 / sampleRate;
-  float rcrate = sqrt((44000 / sampleRate));
+#if defined(ARM_SQRT_FUNC)
+  float rcrate; ARM_SQRT_FUNC(44000 / sampleRate, &rcrate);
+#else
+  float rcrate = SQRT_FUNC((44000 / sampleRate));
+#endif
   rcor24 = (970.0 / 44000) * rcrate;
   rcor24Inv = 1 / rcor24;
 

config.h

@@ -229,9 +229,9 @@ enum { DEXED, REVERB, DELAY, CHORUS };
 // Teensy-3.6 settings
 #define MIDI_DEVICE_USB_HOST 1
 #if defined(USE_REVERB)
-#define MAX_NOTES 11
-#else
 #define MAX_NOTES 14
+#else
+#define MAX_NOTES 16
 #endif
 #endif
 

effect_mono_stereo.cpp

@@ -51,20 +51,15 @@ void AudioEffectMonoStereo::update(void)
 
   if (in && mod && out[0] && out[1])
   {
-    int16_t *ip = in->data;
     float pan = mapfloat(mod->data[0], -1.0, 1.0, 0.0, 1.0);
-    int16_t *op[2] = { out[0]->data, out[1]->data };
+    const float f[2] = { _pseudo_log * arm_sin_f32(pan * PI / 2), _pseudo_log * arm_cos_f32(pan * PI / 2) }; // Pan [L0.0 ... M0.5 ... 1.0R]
 
-    float f_l = _pseudo_log * sinf(pan * PI / 2); // Pan [L0.0 ... M0.5 ... 1.0R]
-    float f_r = _pseudo_log * cosf(pan * PI / 2);
+    arm_q15_to_float (in->data, in_f, AUDIO_BLOCK_SAMPLES);
 
-    for (uint16_t i = 0; i < AUDIO_BLOCK_SAMPLES; i++)
+    for (uint8_t i = 0; i < 2; i++)
     {
-      *op[0] = int16_t(f_l * (*ip));
-      *op[1] = int16_t(f_r * (*ip));
-      op[0]++;
-      op[1]++;
-      ip++;
+      arm_scale_f32 (in_f, f[i], out_f[i], AUDIO_BLOCK_SAMPLES);
+      arm_float_to_q15 (out_f[i], out[i]->data, AUDIO_BLOCK_SAMPLES);
     }
 
     if (in)

effect_mono_stereo.h

@@ -41,10 +41,12 @@ class AudioEffectMonoStereo : public AudioStream
     }
 
     virtual void update(void);
-    
+
   private:
     audio_block_t *inputQueueArray[2];
     audio_block_t *out[2];
+    float in_f[AUDIO_BLOCK_SAMPLES];
+    float out_f[2][AUDIO_BLOCK_SAMPLES];
     const float _pseudo_log = 1048575 / (float)(1 << 20);
 };
 

effect_stereo_mono.cpp

@@ -56,7 +56,7 @@ void AudioEffectStereoMono::update(void)
         bp[1]++;
       }
 #else
-      // device every channel by 2 
+      // devide every channel by 2 
       arm_shift_q15(block[0]->data, -1, block[0]->data, AUDIO_BLOCK_SAMPLES);
       arm_shift_q15(block[1]->data, -1, block[1]->data, AUDIO_BLOCK_SAMPLES);
       // add channel 2 to channel 1

synth.h

@@ -1,18 +1,18 @@
 /*
- * Copyright 2012 Google Inc.
- * 
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- * 
- *      http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+   Copyright 2012 Google Inc.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
 
 #ifndef __SYNTH_H
 #define __SYNTH_H
@@ -53,20 +53,25 @@ typedef __int16 SInt16;
 
 template<typename T>
 inline static T min(const T& a, const T& b) {
-    return a < b ? a : b;
+  return a < b ? a : b;
 }
 
 template<typename T>
 inline static T max(const T& a, const T& b) {
-    return a > b ? a : b;
+  return a > b ? a : b;
 }
 
 #define QER(n,b) ( ((float)n)/(1<<b) )
 
 #define FRAC_NUM float
-#define SIN_FUNC sinf
-#define COS_FUNC cosf
+//#define SIN_FUNC sinf
+#define SIN_FUNC arm_sin_f32  // very fast but not as accurate 
+//#define COS_FUNC cosf
+#define COS_FUNC arm_cos_f32  // very fast but not as accurate 
 #define LOG_FUNC logf
 #define EXP_FUNC expf
+#define SQRT_FUNC sqrtf
+#define ARM_SQRT_FUNC arm_sqrt_f32 // fast but not as accurate 
+
 
 #endif  // __SYNTH_H