Piper TTS Support

[zqlk256]

Summary

I added Piper as a new TTS provider.

Motivation

A twitch streamer I watch is using Curses as part of their speech-to-text-to-speech setup. Until now they were using an Azure TTS voice, but they're unhappy with a recent update and now want to switch to a TTS setup they have more control over. Piper is open source, runs locally, and most voice files are CC-licensed, so it seems ideal.

They asked their community for help with integrating Piper into Curses and I volunteered.

Changes Made

UI

I added a new TTS service "Piper" complete with settings:

The user must specify the path of piper.exe as well as the directory containing the voice files.
To this end I added an InputFilePath component, essentially a text input with a button that opens a file dialog.

Backend

The new module services::piper_tts exposes two functions:

• get_voices to scan a directory for Piper voice files
• speak to speak some text out loud

When invoking piper.exe I need to provide it with a file path for the generated .wav file.
I added a dependency on the tempfile crate to handle this.

Translations

I added a few items to the tts section of the translation files.
I don't speak Chinese, so I just copied the en strings to zh_cn and zh_tw.
You'll want to replace these with proper translations.

The error messages produced by the rust module are all in English as well.

[tianmiao8152]

This is really amazing. I will complete the Chinese translation work in the future