Streaming and Decoding OGG…

Per definition ogg files should use the Vorbis file format using Ogg framing. Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format for mid to high quality: So it is basically the open source alternative to mp3!

xiph.org provides an integer only decoder implementation which is based on pure “C”.
I am providing this version as Arduino Library.

Like Flac from my last post, the API is using a callback pull mechanism to receive the encoded audio data, so I decided to provide a proper StreamingDecoder subclass for this mechanism and officially support it as it is intended to be used. The use is exactly like Flac:

#include "AudioTools.h"
#include "AudioCodecs/CodecVorbis.h"

const char* ssid = "ssid";
const char* pwd = "password";
URLStream url(ssid, pwd);
VorbisDecoder dec;
I2SStream i2s;

void setup() {
  Serial.begin(115200);
  AudioLogger::instance().begin(Serial, AudioLogger::Info);  

  i2s.begin(i2s.defaultConfig(TX_MODE));

  url.begin("http://marmalade.scenesat.com:8086/bitjam.ogg","application/ogg");
  dec.setInputStream(url);
  dec.setOutputStream(i2s);
  dec.begin();
}

void loop() {
  dec.copy();
}

Github

The potentially updated version can be found on Github.

Dependencies

• arduino-audio-toos
• arduino-libvorbis-idec
• arduino-libopus