async _call(audio, {
        max_length = null,
    } = {}) {
        validate_audio_inputs(audio, 'ClapFeatureExtractor');

        // convert to mel spectrogram, truncate and pad if needed.
        const padded_inputs = await this._get_input_mel(
            audio,
            max_length ?? this.config.nb_max_samples,
            this.config.truncation,
            this.config.padding,
        );

        return {
            input_features: padded_inputs.unsqueeze_(0),
        }
    }
Asynchronously extracts features from a given audio using the provided configuration.
@param {Float32Array|Float64Array} audio The audio data as a Float32Array/Float64Array.
@returns {Promise<{ input_features: Tensor }>} A Promise resolving to an object containing the extracted input features as a Tensor.