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docs(voice): add Doubao speech integration examples (TTS + STT)

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Yuan Tao-Wen 2026-05-01 03:36:01 +08:00 • committed by Teknium
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website/docs/user-guide/features/tts.md
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@ -235,6 +235,30 @@ tts:
output_format: wav
```
#### Example: Doubao (Chinese seed-tts-2.0)
For high-quality Chinese TTS via ByteDance's [seed-tts-2.0](https://www.volcengine.com/docs/6561/1257544) bidirectional-streaming API, install the [`doubao-speech`](https://pypi.org/project/doubao-speech/) PyPI package and wire it in as a command provider:
```bash
pip install doubao-speech
export VOLCENGINE_APP_ID="your-app-id"
export VOLCENGINE_ACCESS_TOKEN="your-access-token"
```
```yaml
tts:
provider: doubao
providers:
doubao:
type: command
command: "doubao-speech say --text-file {input_path} --out {output_path}"
output_format: mp3
max_text_length: 1024
timeout: 30
```
Credentials come from your shell environment (`VOLCENGINE_APP_ID` / `VOLCENGINE_ACCESS_TOKEN`) or `~/.doubao-speech/config.yaml`. Pick a voice by adding `--voice zh-female-warm` (or any other alias from `doubao-speech list-voices`) to the command. `doubao-speech` also bundles streaming ASR — see the [STT section below](#example-doubao--volcengine-asr) for Hermes integration. Source and full docs: [github.com/Hypnus-Yuan/doubao-speech](https://github.com/Hypnus-Yuan/doubao-speech).
#### Placeholders
Your command template can reference these placeholders. Hermes substitutes them at render time and shell-quotes each value for the surrounding context (bare / single-quoted / double-quoted), so paths with spaces and other shell-sensitive characters are safe.
@ -323,7 +347,25 @@ stt:
**xAI Grok STT** — Requires `XAI_API_KEY`. Posts to `https://api.x.ai/v1/stt` as multipart/form-data. Good choice if you're already using xAI for chat or TTS and want one API key for everything. Auto-detection order puts it after Groq — explicitly set `stt.provider: xai` to force it.
**Custom local CLI fallback** — Set `HERMES_LOCAL_STT_COMMAND` if you want Hermes to call a local transcription command directly. The command template supports `{input_path}`, `{output_dir}`, `{language}`, and `{model}` placeholders.
**Custom local CLI fallback** — Set `HERMES_LOCAL_STT_COMMAND` if you want Hermes to call a local transcription command directly. The command template supports `{input_path}`, `{output_dir}`, `{language}`, and `{model}` placeholders. Your command must write a `.txt` transcript somewhere under `{output_dir}`.
#### Example: Doubao / Volcengine ASR
If you use [`doubao-speech`](https://pypi.org/project/doubao-speech/) for Doubao TTS (see [above](#example-doubao-chinese-seed-tts-20)), the same package handles speech-to-text via the local-command STT surface:
```bash
pip install doubao-speech
export VOLCENGINE_APP_ID="your-app-id"
export VOLCENGINE_ACCESS_TOKEN="your-access-token"
export HERMES_LOCAL_STT_COMMAND='doubao-speech transcribe {input_path} --out {output_dir}/transcript.txt'
```
```yaml
stt:
provider: local_command
```
Hermes writes the incoming voice message to `{input_path}`, runs the command, and reads the `.txt` file produced under `{output_dir}`. Language is auto-detected by the Volcengine bigmodel endpoint.
### Fallback Behavior