0

I am in the process of making a talking robot and I have linked my ESP32 to a Google text-to-speech service. The service returns me a base64 8-bit audio response.

I need to play this audio and I can't figure out how to do it. I know that an audio playing library exist for PCM but the data that it requires is not base64.

Improve this question
3
  • Base64 is just an encoding to encapsulate 8 bit data into ASCII text. It has nothing to do with audio. Decode it first into your binary data then use a suitable library for your hardware to play it.
    – Majenko ♦
    Jan 23, 2021 at 11:41
  • On the esp, there is also an offline version of text to speech. Just if you want to try it...
    – Adriano
    Jan 23, 2021 at 20:26
  • I don't know weather this will help you there is a guy who makes cool stuff in GitHub text to speech in esp8266 hope it will work in esp32 too github.com/earlephilhower/ESP8266SAM
    – Avon97
    Jan 24, 2021 at 5:52

1 Answer 1

Reset to default
1

Base64 has nothing to do with audio. It is merely a way of encapsulating binary data into ASCII text so that it can safely be included in text-based structures like JSON, or transmitted over a text-based communication channel.

There is no library to "play" base64 simply because base64 is not something you play.

First you decode the base64 text into raw 8-bit binary. It's then that data that you play through whatever library is most suitable for your hardware.

For example on the ESP32 you have the function base64_decode() available. You can read up on how to use it in this tutorial.

Improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.