A Versatile but Simple Arduino Streaming MP3 Player

In the last blogs I presented a Versatile MP3 Player and then a Basic Streaming MP3 Player using my Arduino Audio Tools Library.

If you expect a Versatile Streaming MP3 Player, you will not be disappointed. All the functionality related to the AudioPlayer class which was described in the Versatile MP3 Player Blog is still valid. In our sketch, we just need to replace the AudioSourceSdFat with an AudioSourceURL. In order to support navigation we can define multiple URLs!

The Arduino Sketch

Here is the complete Arduino Sketch which has been tested on a ESP32:

#define USE_HELIX 

#include "AudioTools.h"
#include "AudioCodecs/CodecMP3Helix.h"

using namespace audio_tools;  

const char *urls[] = {
  "http://centralcharts.ice.infomaniak.ch/centralcharts-128.mp3",
  "http://centraljazz.ice.infomaniak.ch/centraljazz-128.mp3",
  "http://centralrock.ice.infomaniak.ch/centralrock-128.mp3",
  "http://centralcountry.ice.infomaniak.ch/centralcountry-128.mp3",
  "http://centralfunk.ice.infomaniak.ch/centralfunk-128.mp3"
};
const char *wifi = "wifi";
const char *password = "password";

URLStream urlStream(wifi, password);
AudioSourceURL source(urlStream, urls, "audio/mp3");
I2SStream i2s;
MP3DecoderHelix decoder;
AudioPlayer player(source, i2s, decoder);

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

  // setup output
  i2s.begin(i2s.defaultConfig(TX_MODE));

  // setup player
  player.begin();
}

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

In this example we provide the output via I2S to an external DAC with the help of the I2SStream class.

External DAC:

For my tests I am using the 24-bit PCM5102 PCM5102A Stereo DAC Digital-to-analog Converter PLL Voice Module pHAT

I am just using the default pins defined by the framework. However I could change them with the help of the config object. The mute pin can be defined in the constructor of the I2SStream – by not defining anything we use the default which is GPIO23

• DEMP – De-emphasis control for 44.1kHz sampling rate(1): Off (Low) / On (High)
• FLT – Filter select : Normal latency (Low) / Low latency (High)
• SCK – System clock input (probably SCL on your board).
• FMT – Audio format selection : I2S (Low) / Left justified (High)
• XSMT – Soft mute control(1): Soft mute (Low) / soft un-mute (High)

Dependencies

The sketch is using the following dependencies:

• arduino-audio-tools
• arduino-libhelix

Source code

You can find the source code for this and other audio player examples on Github.