snapshot

libraries/audio-tools/examples/tests/codecs/test-container-binary-meta/test-container-binary-meta.ino

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+/**
+ * @file communication-container-binary-meta.ino
+ * @author Phil Schatzmann
+ * @brief generate sine wave -> encoder -> decoder -> audiokit (i2s)
+ * We demonstrate how to pass any type of metadata from the encoder to the
+ * decoder
+ * @version 0.1
+ * @date 2023-05-18
+ *
+ * @copyright Copyright (c) 2022
+ *
+ */
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecOpus.h"
+#include "AudioTools/AudioCodecs/ContainerBinary.h"
+#include "AudioTools/AudioLibs/AudioBoardStream.h"
+
+struct MetaData {
+  MetaData(const char* typeArg, float vol) {
+    volume = vol;
+    strncpy(type, typeArg, 5);
+  }
+  MetaData(MetaData* data) {
+    volume = data->volume;
+    strncpy(type, data->type, 5);
+  }
+
+  void log() {
+    Serial.print("====> ");
+    Serial.print(type);
+    Serial.print(": volume ");
+    Serial.println(volume);
+  }
+
+ protected:
+  float volume;
+  char type[5];
+};
+
+void metaCallback(uint8_t* data, int len, void*ref) {
+  assert(sizeof(MetaData)==len);
+  MetaData meta((MetaData*)data);
+  meta.log();
+}
+
+AudioInfo info(8000, 1, 16);
+SineWaveGenerator<int16_t> sineWave(32000);
+GeneratedSoundStream<int16_t> sound(sineWave);
+AudioBoardStream out(AudioKitEs8388V1);
+BinaryContainerDecoder cont_dec(new OpusAudioDecoder());
+BinaryContainerEncoder cont_enc(new OpusAudioEncoder());
+EncodedAudioStream decoder(&out, &cont_dec);
+EncodedAudioStream encoder(&decoder, &cont_enc);StreamCopy copier(encoder, sound);
+MetaData meta{"opus", 0.5};
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // start I2S
+  Serial.println("starting I2S...");
+  auto cfgi = out.defaultConfig(TX_MODE);
+  cfgi.copyFrom(info);
+  out.begin(cfgi);
+
+  // Setup sine wave
+  sineWave.begin(info, N_B4);
+
+  // start decoder
+  decoder.begin(info);
+
+  // start encoder
+  encoder.begin(info);
+
+  // receive meta data 
+  cont_dec.setMetaCallback(metaCallback);
+  
+  // write meta data
+  cont_enc.writeMeta((const uint8_t*)&meta, sizeof(MetaData));
+
+  Serial.println("Test started...");
+}
+
+void loop() { copier.copy(); }