mfcc_vad.h

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/* SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright(c) 2026 Intel Corporation.
 *
 * Author: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
 */

 
#ifndef __SOF_AUDIO_MFCC_MFCC_VAD_H__
#define __SOF_AUDIO_MFCC_MFCC_VAD_H__
 
#include <stdint.h>
#include <stdbool.h>
 
struct processing_module;

#define MFCC_VAD_NOISE_INIT_FRAMES  100

#define MFCC_VAD_NOISE_RISE_ALPHA   98

#define MFCC_VAD_NOISE_RISE_ALPHA_FAST  655

#define MFCC_VAD_ENERGY_THRESHOLD   2516582

#define MFCC_VAD_HANGOVER_FRAMES    20

struct mfcc_vad_state {
    int32_t *noise_floor; 
    int16_t *weights; 
    int32_t energy; 
    int32_t energy_threshold; 
    int32_t noise_energy; 
    int16_t frame_count; 
    int16_t hangover_counter; 
    int16_t hangover_max; 
    int16_t init_frames; 
    int16_t noise_rise_alpha_fast; 
    int16_t noise_rise_alpha_slow; 
    int16_t num_mel_bins; 
    bool initialized; 
    bool is_speech; 
};

int mfcc_vad_init(struct mfcc_vad_state *vad, int num_mel_bins, int32_t sample_rate,
          struct processing_module *mod);

int mfcc_vad_update(struct mfcc_vad_state *vad, const int32_t *mel_log);
 
#endif /* __SOF_AUDIO_MFCC_MFCC_VAD_H__ */