Qwen3-TTS C++ backend

This backend runs Qwen3-TTS GGUF models through qwentts.cpp. It supports 24 kHz speech generation, streaming, named speakers, voice design, and reference-audio cloning depending on the model variant.

Gallery models

The following Base models accept LocalAI Voice Library profiles:

qwen3-tts-cpp
qwen3-tts-cpp-0.6b-base-q4
qwen3-tts-cpp-1.7b-base
qwen3-tts-cpp-1.7b-base-q4

Gallery models containing customvoice or voicedesign implement those Qwen modes instead and are not advertised as raw reference-audio models.

Install a Base model with:

bash

local-ai models install qwen3-tts-cpp

Model configuration

Base filenames are detected automatically. Set tts.voice_cloning only when a verified private conversion has a name that does not identify it as a Base or VoiceClone model:

yaml

name: private-qwen-voice
backend: qwen3-tts-cpp
parameters:
  model: qwen-private/talker.gguf
known_usecases:
  - tts
tts:
  voice_cloning: true
  audio_path: voices/default-reference.wav  # optional model-wide fallback

The tokenizer GGUF is auto-discovered when its filename contains tokenizer and it is stored beside the talker. Otherwise set options: ["tokenizer:qwen-private/tokenizer.gguf"].

tts.voice_cloning: false removes a model from Voice Library compatibility results and rejects saved localai://voice-profiles/... references. It does not disable Qwen's named-speaker or VoiceDesign modes. Setting it to true cannot add cloning to a backend that lacks LocalAI's reference-audio contract.

Request precedence is: a request voice, then tts.voice, then tts.audio_path. A saved profile supplies its private WAV and exact transcript for that request without changing the model YAML.

API example

Create or select a profile in Operate → Voice Library, then pass its stable URI to either speech endpoint:

bash

curl http://localhost:8080/v1/audio/speech \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "qwen3-tts-cpp",
    "input": "This request uses a saved reference voice.",
    "voice": "localai://voice-profiles/PROFILE_ID"
  }' \
  --output speech.wav

Native end-to-end test

The labeled test loads real GGUFs, synthesizes speech, streams audio, and exercises cloning with a generated 24 kHz reference WAV:

bash

make -C backend/go/qwen3-tts-cpp qwen3-tts-cpp

QWEN3TTS_MODEL=/path/to/qwen-talker-0.6b-base-Q8_0.gguf \
QWEN3TTS_CODEC=/path/to/qwen-tokenizer-12hz-Q8_0.gguf \
QWEN3TTS_LIBRARY=backend/go/qwen3-tts-cpp/libgoqwen3ttscpp-fallback.so \
  go test ./backend/go/qwen3-tts-cpp -ginkgo.label-filter=e2e