snapshot

libraries/audio-tools/tests-cmake/codec/opus/opus.cpp

@@ -0,0 +1,51 @@
+/**
+ * @file test-codec-opus.ino
+ * @author Phil Schatzmann
+ * @brief generate sine wave -> encoder -> decoder -> audiokit (i2s)
+ * @version 0.1
+ * @date 2022-04-30
+ * 
+ * @copyright Copyright (c) 2022
+ * 
+ */
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecOpus.h"
+
+int sample_rate = 24000;
+int channels = 1;  // The stream will have 2 channels
+
+SineWaveGenerator<int16_t> sineWave( 32000);  // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> sound( sineWave); // Stream generated from sine wave
+CsvOutput<int16_t> out(Serial, 2);   // Output of sound on desktop 
+OpusAudioEncoder enc;
+OpusAudioDecoder dec;
+EncodedAudioStream decoder(&out, &dec); // encode and write 
+EncodedAudioStream encoder(&decoder, &enc); // encode and write 
+StreamCopy copier(encoder, sound);     
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Debug);
+
+
+  // Setup sine wave
+  auto cfgs = sineWave.defaultConfig();
+  cfgs.sample_rate = sample_rate;
+  cfgs.channels = channels;
+  cfgs.bits_per_sample = 16;
+  sineWave.begin(cfgs, N_B4);
+
+  // Opus decoder needs to know the audio info
+  decoder.begin(cfgs);
+
+  // configure and start encoder
+  enc.config().application = OPUS_APPLICATION_AUDIO;
+  encoder.begin(cfgs);
+
+  Serial.println("Test started...");
+}
+
+
+void loop() { 
+  copier.copy();
+}