Files
petal/deploy/setup-piper.sh
prosolis 5120b1e5a2 Read-aloud: natural neural voice via local Piper TTS
Replace the browser's robotic Web Speech API (espeak on Chromium) as the
primary read-aloud path with server-side Piper neural TTS, served by petal
and kept fully offline on millenia next to Ollama.

- internal/tts: proxy short passages to Piper, transcode WAV -> mp3/opus via
  ffmpeg, content-addressed disk cache (instant re-taps). Each Piper instance
  loads one voice, so language routes to its own endpoint:{voice}. Unknown
  language -> 404 so the client falls back to Web Speech. UTF-8-safe truncation
  for multibyte (Chinese) text.
- config: TTS_ENDPOINT / TTS_ENDPOINT_ZH / TTS_VOICE_EN / TTS_VOICE_ZH /
  TTS_CACHE_DIR / TTS_TIMEOUT / TTS_AUDIO_FORMAT. Route mounts only when
  TTS_ENDPOINT is set; otherwise unchanged behavior.
- web/audio/speech.ts: speak() hits /api/tts first, falls back to Web Speech on
  any failure; rapid-tap-safe via a request token. Call sites unchanged.
- deploy/: Piper user systemd units (EN :5005, ZH :5006), setup script, README.

English (en_US-amy-medium) and Chinese (zh_CN-huayan-medium) are both live.

Claude-Session: https://claude.ai/code/session_016Yr6jELuRc7hyzYLccQKZd
2026-06-26 11:34:52 -07:00

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#!/usr/bin/env bash
# One-time Piper TTS setup on millenia as a *user* systemd service (no sudo).
# Idempotent — safe to re-run. Run on the box:
# bash setup-piper.sh
# To survive logout/reboot, also (once, needs root):
# sudo loginctl enable-linger "$USER"
set -euo pipefail
PIPER_HOME="$HOME/piper"
VENV="$PIPER_HOME/venv"
VOICES="$PIPER_HOME/voices"
VOICE=en_US-amy-medium
UNIT_DIR="$HOME/.config/systemd/user"
export XDG_RUNTIME_DIR="/run/user/$(id -u)"
echo ">> ffmpeg check (petal transcodes Piper WAV -> mp3 with it):"
command -v ffmpeg >/dev/null || { echo "ffmpeg not found on PATH"; exit 1; }
echo ">> venv + piper-tts[http]"
[ -d "$VENV" ] || python3 -m venv "$VENV"
"$VENV/bin/pip" install --upgrade pip >/dev/null
"$VENV/bin/pip" install "piper-tts[http]"
echo ">> download voice $VOICE"
mkdir -p "$VOICES"
"$VENV/bin/python" -m piper.download_voices "$VOICE" --data-dir "$VOICES"
echo ">> install user service"
mkdir -p "$UNIT_DIR"
install -m 0644 "$(dirname "$0")/piper.service" "$UNIT_DIR/piper.service"
systemctl --user daemon-reload
systemctl --user enable --now piper.service
echo ">> wait + status"
sleep 2
systemctl --user --no-pager --full status piper.service | head -n 6 || true
echo ">> smoke test"
curl -sf -X POST localhost:5005/ \
-H 'Content-Type: application/json' \
-d "{\"text\":\"hello there\",\"voice\":\"$VOICE\"}" -o /tmp/piper-test.wav \
&& echo "OK: /tmp/piper-test.wav ($(stat -c%s /tmp/piper-test.wav) bytes)" \
|| { echo "smoke test FAILED"; journalctl --user -u piper.service --no-pager | tail -n 20; exit 1; }