Having a simple Rtttl streaming API

[nielsnl68]

I like to have a simple way to play RTTTL sounds with the build in sine generator.

[pschatzmann]

Actually that would make a lot of sense: but using any supported generator: This would allow you e.g to use the Instruments that are available in the STK!

This shouldn't be too difficult to implement since all the functionality is already there. We just need to implement a parser and link it to the available functionality.

Woud you be willing to contribute or eventually test ?

[nielsnl68]

Based on my code review of the audio-tools files, i think it would be easy to implement using the MusicalNotes class.

I could implement it when you could give me a suggestion/scalation on how i could do it properly. In the past i modified the RTTTI component within ESPHome so i have some idea on how to do this.

[nielsnl68]

Not sure is we understand each other, the first needs to finish before the second start playing.

[pschatzmann]

There is no asynchonous processing! A print returns only after it has been fully processed...

[nielsnl68]

Are you sure? could you test the above? I only hear the first rttti string and while playing i hear sometimes the second under the first one playing.

[pschatzmann]

I just double checked and for me it is working like a charm.
I moved the functionality into the core so that no separate import is required any more...

[pschatzmann]

https://www.pschatzmann.ch/home/2025/10/21/rtttl/

[nielsnl68]

Small question;

AudioInfo info(16000, 2, 16);
SineWaveGenerator<int16_t> sineWave(32000);  // subclass of SoundGenerator with max amplitude of 32000

The value sineWave(32000) should that be the same as info(16000, ... ) ?

[pschatzmann]

If you check in the class documentation you will see that this is the max amplitude: so 32000 defines the volume.
16000 gives half the amplitude

[nielsnl68]

Sorry to say i find it hard to navigate trough your documentation :(

[pschatzmann]

Just use the All Classes Alphabetically link and search by the class name in the browser.
This should not be too difficult...