Add Mixer8 to Mixer4 and rename files

AudioMixer4_F32.cpp

@@ -1,30 +0,0 @@
-#include "AudioMixer4_F32.h"
-
-void AudioMixer4_F32::update(void) {
-  audio_block_f32_t *in, *out=NULL;
-
-  out = receiveWritable_f32(0);
-  if (!out) return;
-
-  arm_scale_f32(out->data, multiplier[0], out->data, out->length);
-
-  for (int channel=1; channel < 4; channel++) {
-    in = receiveReadOnly_f32(channel);
-    if (!in) {
-      continue;
-    }
-
-    audio_block_f32_t *tmp = allocate_f32();
-
-    arm_scale_f32(in->data, multiplier[channel], tmp->data, tmp->length);
-    arm_add_f32(out->data, tmp->data, out->data, tmp->length);
-
-    release(tmp);
-    release(in);
-  }
-
-  if (out) {
-    transmit(out);
-    release(out);
-  }
-}

AudioMixer_F32.cpp

@@ -0,0 +1,60 @@
+#include "AudioMixer_F32.h"
+
+void AudioMixer4_F32::update(void) {
+  audio_block_f32_t *in, *out=NULL;
+
+  out = receiveWritable_f32(0);
+  if (!out) return;
+
+  arm_scale_f32(out->data, multiplier[0], out->data, out->length);
+
+  for (int channel=1; channel < 4; channel++) {
+    in = receiveReadOnly_f32(channel);
+    if (!in) {
+      continue;
+    }
+
+    audio_block_f32_t *tmp = allocate_f32();
+
+    arm_scale_f32(in->data, multiplier[channel], tmp->data, tmp->length);
+    arm_add_f32(out->data, tmp->data, out->data, tmp->length);
+
+    AudioStream_F32::release(tmp);
+    AudioStream_F32::release(in);
+  }
+
+  if (out) {
+    AudioStream_F32::transmit(out);
+    AudioStream_F32::release(out);
+  }
+}
+
+void AudioMixer8_F32::update(void) {
+  audio_block_f32_t *in, *out=NULL;
+
+  out = receiveWritable_f32(0);  //try to get the first input channel
+  if (!out) return;  //if it's not there, return immediately
+
+  arm_scale_f32(out->data, multiplier[0], out->data, out->length); //scale the first input channel
+
+  //load and process the rest of the channels
+  for (int channel=1; channel < 4; channel++) {
+    in = receiveReadOnly_f32(channel);
+    if (!in) {
+      continue;
+    }
+
+    audio_block_f32_t *tmp = allocate_f32();
+
+    arm_scale_f32(in->data, multiplier[channel], tmp->data, tmp->length);
+    arm_add_f32(out->data, tmp->data, out->data, tmp->length);
+
+    AudioStream_F32::release(tmp);
+    AudioStream_F32::release(in);
+  }
+
+  if (out) {
+    AudioStream_F32::transmit(out);
+    AudioStream_F32::release(out);
+  }
+}

AudioMixer_F32.h

@@ -1,23 +1,28 @@
 /*
- * AudioMixer4
+ * AudioMixer
  * 
+ * AudioMixer4
  * Created: Patrick Radius, December 2016
  * Purpose: Mix up to 4 audio channels with individual gain controls.
  * Assumes floating-point data.
  *          
  * This processes a single stream fo audio data (ie, it is mono)       
  *
+ * Extended to AudioMixer8
+ * By: Chip Audette, OpenAudio, Feb 2017
+ *          
  * MIT License.  use at your own risk.
 */
 
-#ifndef AUDIOMIXER4F32_H
+#ifndef AUDIOMIXER_F32_H
-#define AUDIOMIXER4F32_H
+#define AUDIOMIXER_F32_H
 
 #include <arm_math.h> 
 #include <AudioStream_F32.h>
 
 class AudioMixer4_F32 : public AudioStream_F32 {
 //GUI: inputs:4, outputs:1  //this line used for automatic generation of GUI node
+//GUI: shortName:Mixer4
 public:
     AudioMixer4_F32() : AudioStream_F32(4, inputQueueArray) {
       for (int i=0; i<4; i++) multiplier[i] = 1.0;
@@ -35,4 +40,24 @@ public:
     float multiplier[4];
 };
 
+class AudioMixer8_F32 : public AudioStream_F32 {
+//GUI: inputs:8, outputs:1  //this line used for automatic generation of GUI node
+//GUI: shortName:Mixer8
+public:
+    AudioMixer8_F32() : AudioStream_F32(8, inputQueueArray) {
+      for (int i=0; i<8; i++) multiplier[i] = 1.0;
+    }
+
+    virtual void update(void);
+
+    void gain(unsigned int channel, float gain) {
+      if (channel >= 8 || channel < 0) return;
+      multiplier[channel] = gain;
+    }
+
+  private:
+    audio_block_f32_t *inputQueueArray[8];
+    float multiplier[8];
+};
+
 #endif

OpenAudio_ArduinoLibrary.h

@@ -7,7 +7,7 @@
 #include <AudioEffectCompressor_F32.h>
 #include <AudioFilterFIR_F32.h>
 #include <AudioFilterIIR_F32.h>
-#include <AudioMixer4_F32.h>
+#include <AudioMixer_F32.h>
 #include <AudioMultiply_F32.h>
 #include "input_i2s_f32.h"
 #include "play_queue_f32.h"