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/v3/audio/speech ignores response_format and always returns 32-bit float WAV

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Valutazione

Difficoltà
3/5
Tempo stimato
1-2 giorni
Idoneità per principianti
58/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
cpp
Ambito
api, backend

Direzione di ricerca

Start at the /v3/audio/speech entry point and trace the T2sCalculator output used by the provided graph.pbtxt. Reproduce the curl requests for wav, pcm, mp3, and flac, then verify that supported formats have the expected sample encoding and Content-Type, while unsupported formats return HTTP 400.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

Describe the bug
The OpenAI-compatible text-to-speech endpoint /v3/audio/speech ignores response_format. For wav, pcm, mp3 and flac it returns the same body: a WAV file with 32-bit IEEE float samples (format tag 3). The response is also sent with Content-Type: application/json; charset=utf-8.

The OpenAI API specifies 16-bit PCM for wav and headerless 16-bit little-endian PCM for pcm, so clients written against it cannot play the output. For example, wyoming_openai (the Wyoming bridge used by Home Assistant) cannot parse the float WAV header and plays static: https://github.com/roryeckel/wyoming_openai/issues/72

To Reproduce

  1. Models repository: OpenVINO/Kokoro-82M-int8-ov pulled from Hugging Face into /models/OpenVINO/Kokoro-82M-int8-ov, graph generated with ovms --configure --model_path /models/OpenVINO/Kokoro-82M-int8-ov --target_device CPU: 
    input_stream: "HTTP_REQUEST_PAYLOAD:input"
output_stream: "HTTP_RESPONSE_PAYLOAD:output"
node {
    name: "T2sExecutor"
    calculator: "T2sCalculator"
    input_side_packet: "TTS_NODE_RESOURCES:t2s_servable"
    input_stream: "HTTP_REQUEST_PAYLOAD:input"
    output_stream: "HTTP_RESPONSE_PAYLOAD:output"
    node_options: {
        [type.googleapis.com / mediapipe.T2sCalculatorOptions]: {
            models_path: "/models/OpenVINO/Kokoro-82M-int8-ov"
            target_device: "CPU"
            plugin_config: '{"NUM_STREAMS":"1"}'
            }
    }
}
  2. OVMS launch command (container openvino/model_server:latest-gpu): 
    --rest_port 8080 --config_path /config/config.json --cache_dir /cache --log_level INFO
  3. Client command: 
    for rf in wav pcm mp3 flac; do
  curl -s http://localhost:8080/v3/audio/speech -H 'Content-Type: application/json' \
    -d "{\"model\":\"OpenVINO/Kokoro-82M-int8-ov\",\"input\":\"Hello there.\",\"voice\":\"am_adam\",\"response_format\":\"$rf\"}" \
    -o "out.$rf"
  file -b "out.$rf"
done
  4. Every file is identical (146444 bytes): 
    RIFF (little-endian) data, WAVE audio, IEEE Float, mono 24000 Hz
    Response headers: 
    HTTP/1.1 200 OK
content-length: 146444
content-type: application/json; charset=utf-8

Expected behavior

  • wav (the default) returns a 16-bit PCM WAV, as OpenAI does.
  • pcm returns headerless 16-bit little-endian PCM.
  • Formats OVMS cannot produce (e.g. mp3, flac) are rejected with a 400 error instead of silently returning a WAV.
  • The Content-Type matches the audio format (e.g. audio/wav).

Logs
Nothing is logged for these requests at --log_level INFO; I have not captured DEBUG logs.

Configuration

  1. OVMS version: OpenVINO Model Server 2026.4.0.869b2186a, OpenVINO backend 2026.4.0-22959-99c81491cc3-releases/2026/4, OpenVINO GenAI backend 2026.4.0.0-3407-7ea2546852a
  2. config.json: 
    {
  "model_config_list": [
    { "config": { "name": "OpenVINO/Kokoro-82M-int8-ov", "base_path": "/models/Kokoro-82M-int8-ov-cpu" } }
  ]
}
  3. Intel Core Ultra 5 125H (Meteor Lake), target device CPU
  4. Model repository: 
    /models/Kokoro-82M-int8-ov-cpu/graph.pbtxt
/models/OpenVINO/Kokoro-82M-int8-ov/{config.json, openvino_config.json, openvino_model.xml, openvino_model.bin, voices/, ...}
  5. Model: https://huggingface.co/OpenVINO/Kokoro-82M-int8-ov
Lingua principale
C++
Stelle
932
Fork
278
Merge medio
2g 23h
PR unite (30g)
68

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