GeneratorFromArray

Author: pschatzmann

examples/examples-audiokit/streams-generator_fromarray-audiokit/streams-generator_fromarray-audiokit.ino

@@ -0,0 +1,46 @@
+/**
+ * @file streams-generator_fromarray-audiokit.ino
+ * @brief Tesing GeneratorFromArray with output on audiokit
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+ 
+#include "AudioTools.h"
+#include "AudioLibs/AudioKit.h"
+
+uint16_t sample_rate=44100
+;
+uint8_t channels = 2;                                      // The stream will have 2 channels 
+int16_t sine_array[] = {0, 2285, 4560, 6812, 9031, 11206, 13327, 15383, 17363, 19259, 21062, 22761, 24350, 25820, 27165, 28377, 29450, 30381, 31163, 31793, 32269, 32587, 32747, 32747, 32587, 32269, 31793, 31163, 30381, 29450, 28377, 27165, 25820, 24350, 22761, 21062, 19259, 17363, 15383, 13327, 11206, 9031, 6812, 4560, 2285, 0, -2285, -4560, -6812, -9031, -11206, -13327, -15383, -17363, -19259, -21062, -22761, -24350, -25820, -27165, -28377, -29450, -30381, -31163, -31793, -32269, -32587, -32747, -32747, -32587, -32269, -31793, -31163, -30381, -29450, -28377, -27165, -25820, -24350, -22761, -21062, -19259, -17363, -15383, -13327, -11206, -9031, -6812, -4560, -2285 };
+GeneratorFromArray<int16_t> sineWave(sine_array,0,false);
+GeneratedSoundStream<int16_t> sound(sineWave);             // Stream generated from sine wave
+AudioKitStream out; 
+
+StreamCopy copier(out, sound);                             // copies sound into i2s
+
+// Arduino Setup
+void setup(void) {  
+  // Open Serial 
+  Serial.begin(115200);
+  AudioLogger::instance().begin(Serial, AudioLogger::Warning);
+
+  // start I2S
+  Serial.println("starting I2S...");
+  auto config = out.defaultConfig(TX_MODE);
+  config.sample_rate = sample_rate; 
+  config.channels = channels;
+  config.bits_per_sample = 16;
+  out.begin(config);
+
+  // Setup sine wave
+  auto cfg = sineWave.defaultConfig();
+  cfg.channels = channels;
+  cfg.sample_rate = sample_rate;
+  sineWave.begin(cfg);
+  Serial.println("started...");
+}
+
+// Arduino loop - copy sound to out 
+void loop() {
+  copier.copy();
+}

examples/examples-stream/streams-generator_fromarray-analog/README.md

@@ -0,0 +1,25 @@
+# I2S Analog Output Test
+
+This is a simple basic test for the ESP32 __analog output__ using I2S.
+
+We just send a generated sine wave and expect to hear a clean signal.
+Please note the log level should be set so that there is no disturbing output!
+
+ 
+### Output Device: Piezo Electric Element
+
+To test the output I am using a piezo electric element
+
+![DAC](https://pschatzmann.github.io/arduino-audio-tools/resources/piezo.jpeg)
+
+It should also be possible to connect a headphone to the output pins...
+
+
+On the ESP32 the output is on the Pins GPIO26 and GPIO27
+
+| PIEZO     |  ESP32
+| --------| ---------------
+| +       |  GPIO25 / GPIO26
+| -       |  GND
+
+

examples/examples-stream/streams-generator_fromarray-analog/streams-generator_fromarray-analog.ino

@@ -0,0 +1,48 @@
+/**
+ * @file streams-generator_fromarray-analog.ino
+ * @author Phil Schatzmann
+ * @brief Example for GeneratorFromArray
+ * @version 0.1
+ * @date 2022-03-22
+ * 
+ * @copyright Copyright (c) 2022
+ * 
+ */
+#include "AudioTools.h"
+#include "AudioLibs/AudioKit.h"
+
+uint16_t sample_rate=44100;
+uint8_t channels = 1;                                      // The stream will have 2 channels 
+int16_t sine_array[] = {0, 4560, 9031, 13327, 17363, 21062, 24350, 27165, 29450, 31163, 32269, 32747, 32587, 31793, 30381, 28377, 25820, 22761, 19259, 15383, 11206, 6812, 2285, -2285, -6812, -11206, -15383, -19259, -22761, -25820, -28377, -30381, -31793, -32587, -32747, -32269, -31163, -29450, -27165, -24350, -21062, -17363, -13327, -9031, -4560  };
+GeneratorFromArray<int16_t> sineWave(sine_array,0,false);
+GeneratedSoundStream<int16_t> sound(sineWave);             // Stream generated from sine wave
+AnalogAudioStream out; 
+
+StreamCopy copier(out, sound);                             // copies sound into i2s
+
+// Arduino Setup
+void setup(void) {  
+  // Open Serial 
+  Serial.begin(115200);
+  AudioLogger::instance().begin(Serial, AudioLogger::Warning);
+
+  // start I2S
+  Serial.println("starting I2S...");
+  auto config = out.defaultConfig(TX_MODE);
+  config.sample_rate = sample_rate; 
+  config.channels = channels;
+  config.bits_per_sample = 16;
+  out.begin(config);
+
+  // Setup sine wave
+  auto cfg = sineWave.defaultConfig();
+  cfg.channels = channels;
+  cfg.sample_rate = sample_rate;
+  sineWave.begin(cfg);
+  Serial.println("started...");
+}
+
+// Arduino loop - copy sound to out 
+void loop() {
+  copier.copy();
+}

src/AudioEffects/SoundGenerator.h

@@ -415,6 +415,10 @@ class GeneratorFromArray : public SoundGenerator<T> {
       LOGI("table_length: %d", (int)size);
     }
 
+    virtual void begin(AudioBaseInfo info) {
+        SoundGenerator<T>::begin(info);
+    }
+
     /// Starts the generation of samples
     void begin() override {
       LOGI(LOG_METHOD);