Edge AI TTS Server

A real-time text-to-speech server with HTTP API and local audio playback.

Building

cmake -Bbuild -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$PWD/install
cmake --build build
cmake --install build

Requirements

• CMake 3.26+
• C++17 compiler
• PortAudio (brew install portaudio on macOS, sudo apt install portaudio19-dev on Linux)

Running

./build/tts_server <model.onnx> <model.onnx.json> <espeak-ng-data>

The server listens on http://0.0.0.0:9999.

API Endpoints

Speak Text (with local playback)

# Speak immediately
curl -X POST http://localhost:9999/ -d "Hello world"

# Stream text (buffers until punctuation)
curl -X POST http://localhost:9999/stream -d "Hello, "
curl -X POST http://localhost:9999/stream -d "world."
curl -X POST http://localhost:9999/flush

# Cancel playback
curl -X POST http://localhost:9999/cancel

Synthesize to File

curl -X POST http://localhost:9999/synthesize -d "Hello world" -o output.raw

# Convert to MP3
ffmpeg -f f32le -ar 22050 -ac 1 -i output.raw output.mp3

License

Copyright (c) 2026 Edge AI, LLC. All rights reserved.