68 lines
2.4 KiB
Markdown
68 lines
2.4 KiB
Markdown
# A Simple Streaming Audio Player
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It was pretty simple to build a simple audio player with the help of the Stream API.
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The AudioPlayer supports
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- __multiple processor architectures__
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- __multiple audio data sources__ (SD, URL, callbacks)
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- __different Output__ Scenarios (I2S, PWM, A2DP etc). Just pass the desired output stream object to the constructor.
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- __different Decoders__ for MP3, AAC, WAV. Just pass the desired decoder object to the constructor.
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- __Volume Control__ (by calling player.setVolume())
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- __Stopping and Resuming__ the processing (by calling player.stop() and player.play())
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- You can __move to the next file__ by calling player.next();
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- support for __Metadata__
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The example demonstrates how to implement an __MP3 Player__ which provides the data via the Internet (with the help of the AudioSourceURL class) and sends the audio via I2S to an external DAC using an ESP32.
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### The External DAC
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For my tests I am using the 24-bit PCM5102 PCM5102A Stereo DAC Digital-to-analog Converter PLL Voice Module pHAT
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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
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DAC | ESP32
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-----|----------------
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VCC | 5V
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GND | GND
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BCK | BCK (GPIO14)
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DIN | OUT (GPIO22)
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LCK | BCK (GPIO15)
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FMT | GND
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XMT | 3V (or another GPIO PIN which is set to high)
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- DMP - De-emphasis control for 44.1kHz sampling rate(1): Off (Low) / On (High)
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- FLT - Filter select : Normal latency (Low) / Low latency (High)
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- SCL - System clock input (probably SCL on your board).
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- FMT - Audio format selection : I2S (Low) / Left justified (High)
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- XMT - Soft mute control(1): Soft mute (Low) / soft un-mute (High)
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### Wiring the Volume Potentiometer
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| Pot | ESP32 | ESP8266
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| --------| ---------|---------
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| POW | 3V | 3V
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| GND | GND | GND
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| VOUT | A0 | A0
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### Moving to the next song
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We use a button to move to the next url.
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| Button | ESP32 | ESP8266
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|------------|----------|---------
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| Button | GPIO13 | GPIO13
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| Out 3V
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### Dependencies
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- https://github.com/pschatzmann/arduino-audio-tools
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- https://github.com/pschatzmann/codec-helix
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