fix broken Sine generator

Author: pschatzmann

src/AudioTools/AudioCopy.h

@@ -54,8 +54,8 @@ class StreamCopyT {
             size_t result = 0;
             size_t delayCount = 0;
             size_t len = available();
-            size_t bytes_to_read;
-            size_t bytes_read; 
+            size_t bytes_to_read=0;
+            size_t bytes_read=0; 
 
             if (len>0){
                 bytes_to_read = min(len, static_cast<size_t>(buffer_size));

src/AudioTools/SoundGenerator.h

@@ -43,9 +43,13 @@ 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=1){
+        virtual size_t readBytes( uint8_t *buffer, size_t lengthBytes, uint8_t channels){
             LOGD("readBytes: %d - channesl = %d",lengthBytes, channels);
             size_t result = 0;
             int frame_size = sizeof(T) * channels;

src/AudioTools/Streams.h

@@ -168,6 +168,7 @@ class GeneratedSoundStream : public Stream {
 
         /// privide the data as byte stream
         size_t readBytes( char *buffer, size_t length) {
+            LOGD("GeneratedSoundStream::readBytes: %zu", length);
             return generator_ptr->readBytes((uint8_t*)buffer, length, channels);
         }