fix broken sound generator

Author: pschatzmann

examples-desktop/generator/generator.ino

@@ -3,7 +3,7 @@
 using namespace audio_tools;  
 
 uint16_t sample_rate=44100;
-uint8_t channels = 2;                                     // The stream will have 2 channels 
+uint8_t channels = 1;                                     // The stream will have 2 channels 
 SineWaveGenerator<int16_t> sineWave(32000);               // subclass of SoundGenerator with max amplitude of 32000
 GeneratedSoundStream<int16_t> in(sineWave, channels);     // Stream generated from sine wave
 DefaultStream out;                                        // On desktop we use 
@@ -22,7 +22,7 @@ void setup(void) {
   out.begin(config);
 
   // Setup sine wave
-  sineWave.begin(sample_rate, N_B4);
+  sineWave.begin(channels, sample_rate, N_B4);
 
 }
 

src/AudioTools/SoundGenerator.h

@@ -43,18 +43,14 @@ class SoundGenerator  {
         /// Provides a single sample
         virtual  T readSample() = 0;
 
-        /// Provides the data as byte array with the requested number of channels
-        virtual size_t readBytes( uint8_t *buffer, size_t lengthBytes){
-            return readBytes(buffer, lengthBytes);
-        }
 
         /// Provides the data as byte array with the requested number of channels
-        virtual size_t readBytes( uint8_t *buffer, size_t lengthBytes, uint8_t channels){
+        virtual size_t readBytes( uint8_t *buffer, size_t lengthBytes){
             LOGD("readBytes: %d - channesl = %d",lengthBytes, channels);
             size_t result = 0;
             int frame_size = sizeof(T) * channels;
             if (active){
-                switch (channels){
+                switch (channels()){
                     case 1:
                         result = readSamples((T*) buffer, lengthBytes / frame_size) ;
                         break;
@@ -93,12 +89,23 @@ class SoundGenerator  {
             return active;
         }
 
+        void setChannels(int channels){
+            output_channels = channels;
+        }
+
+        int channels() {
+            return output_channels;
+        }
+
     protected:
         bool active = false;
         bool activeWarningIssued = false;
+        int output_channels = 1;
 
 };
 
+
+
 /**
  * @brief Generates a Sound with the help of sin() function.
  * @author Phil Schatzmann
@@ -115,8 +122,15 @@ class SineWaveGenerator : public SoundGenerator<T> {
             m_phase = phase;
         }
 
-        /// Starts the processing by defining the sample rate and frequency
-        void begin(uint16_t sample_rate=44100, uint16_t frequency=0){
+        void begin() {
+            b
+            egin(1, 44100, 0);
+        }
+        void begin(uint16_t sample_rate, uint16_t frequency=0){
+            begin(1, sample_rate, frequency);
+        }
+
+        void begin(int channels, uint16_t sample_rate, uint16_t frequency=0){
             LOGI("SineWaveGenerator::begin");
             this->m_frequency = frequency;
             this->m_sample_rate = sample_rate;