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use std::path::PathBuf;
use std::process::Stdio;
use std::time::Instant;
use tokio::io::AsyncWriteExt;
use tracing::{debug, info, warn};
use crate::config;
use crate::config::TEMP_PATH;
use crate::error::{Error, Result};
/// Synthesize speech for `text`.
///
/// Primary engine is local Piper TTS (via the `piper` CLI). If Piper is not
/// installed, fails, or `TTS_MODEL_PATH` is unset, we fall back to Google
/// Translate TTS over HTTP.
///
/// Returns the encoded audio bytes plus the file extension to use when saving
/// (`"wav"` for Piper, `"mp3"` for Google).
pub async fn synthesize(
config: &config::Config,
http_client: &reqwest::Client,
text: &str,
) -> Result<(Vec<u8>, &'static str)> {
match config.piper_model_path() {
Some(model_path) => {
let started = Instant::now();
match piper_synthesize(&model_path, text).await {
Ok(bytes) => {
info!(
model = %model_path.display(),
text_len = text.len(),
bytes = bytes.len(),
elapsed_ms = started.elapsed().as_millis() as u64,
"Piper TTS synthesized"
);
return Ok((bytes, "wav"));
}
Err(e) => {
warn!(
model = %model_path.display(),
text_len = text.len(),
elapsed_ms = started.elapsed().as_millis() as u64,
"Piper TTS failed, falling back to Google TTS: {e}"
);
}
}
}
None => {
debug!("TTS_MODEL_PATH is not set; using Google TTS fallback");
}
}
let started = Instant::now();
let bytes = google_synthesize(http_client, text).await?;
info!(
text_len = text.len(),
bytes = bytes.len(),
elapsed_ms = started.elapsed().as_millis() as u64,
"Google TTS synthesized"
);
Ok((bytes, "mp3"))
}
/// Run `piper` as a subprocess, feeding `text` on stdin and collecting the
/// generated WAV from `--output_file`.
async fn piper_synthesize(model_path: &PathBuf, text: &str) -> Result<Vec<u8>> {
tokio::fs::create_dir_all(TEMP_PATH).await.ok();
let out_path = format!("{}/tts_piper_{}.wav", TEMP_PATH, uuid::Uuid::new_v4());
let model = model_path.to_string_lossy().to_string();
debug!(model = %model, "spawning piper subprocess");
let started = Instant::now();
let mut child = tokio::process::Command::new("piper")
.arg("--model")
.arg(&model)
.arg("--output_file")
.arg(&out_path)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.spawn()
.map_err(|e| Error::Custom(crate::lang::fmt_tts_piper_launch(&e.to_string())))?;
{
let mut stdin = child
.stdin
.take()
.ok_or_else(|| Error::Custom("Piper stdin unavailable".into()))?;
stdin.write_all(text.as_bytes()).await?;
stdin.write_all(b"\n").await?;
}
let output = child.wait_with_output().await?;
let elapsed_ms = started.elapsed().as_millis() as u64;
if !output.status.success() {
let stderr = String::from_utf8_lossy(&output.stderr);
warn!(
model = %model,
elapsed_ms,
"piper exited with error: {}",
stderr.trim_end()
);
let _ = tokio::fs::remove_file(&out_path).await;
return Err(Error::Custom(crate::lang::fmt_tts_piper_failed(
stderr.trim_end(),
)));
}
let bytes = tokio::fs::read(&out_path).await?;
debug!(
model = %model,
bytes = bytes.len(),
elapsed_ms,
"piper succeeded"
);
let _ = tokio::fs::remove_file(&out_path).await;
Ok(bytes)
}
/// Fetch Google Translate TTS (Polish) over HTTP.
async fn google_synthesize(client: &reqwest::Client, text: &str) -> Result<Vec<u8>> {
let tts_url = format!(
"https://translate.google.com/translate_tts?ie=UTF-8&q={}&tl=pl&client=tw-ob",
urlencoding(text)
);
debug!(url_len = tts_url.len(), "fetching Google TTS");
let bytes = client.get(&tts_url).send().await?.bytes().await?;
Ok(bytes.to_vec())
}
pub fn urlencoding(s: &str) -> String {
let mut out = String::with_capacity(s.len());
for &byte in s.as_bytes() {
match byte {
b'A'..=b'Z' | b'a'..=b'z' | b'0'..=b'9' | b'_' | b'-' | b'.' | b'~' => {
out.push(byte as char)
}
b' ' => out.push('+'),
_ => out.push_str(&format!("%{:02X}", byte)),
}
}
out
}
|
