Text to speech in C

Download an exported model such as OpenVINO/Kokoro-82M-int8-ov. Keep config.json, openvino_model.xml, openvino_model.bin, the selected voices/*.bin file, and the English lexicon files in data/ together in the model directory.

Build this sample with ENABLE_SAMPLES=ON, then run:

text2speech_c MODEL_DIR "Hello from OpenVINO" MODEL_DIR/voices/af_heart.bin output_audio.wav --device CPU

To generate two waveforms in one call with the same speaker embedding (optionally with --speed, --language and --device flags):

text2speech_c --batch MODEL_DIR "Hello from OpenVINO" "A second sentence" \
  MODEL_DIR/voices/af_heart.bin first.wav second.wav --speed 1.1 --language en-us

The sample reads a float32 speaker embedding and writes a mono 16-bit PCM WAV file. Kokoro requires an embedding. Pass - in its place to use the default voice of a model that provides one, such as SpeechT5. The returned waveform tensor is owned by the caller and must be released with ov_tensor_free.

For SpeechT5, llmware/speech-t5-tts-ov provides an exported model with openvino_tokenizer.xml and openvino_tokenizer.bin, which are required for text input.