spectral.h

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#pragma once
 
/* Existing buffer budgets in bytes, including NUL for text storage. */
#define SPECTRAL_BAND_COUNT 4
 
#include <ascii-chat/asciichat_errno.h>
#include <stdbool.h>
#include <stddef.h>
 
#ifdef __cplusplus
extern "C" {
#endif

typedef struct spectral_processor spectral_processor_t;
typedef struct {
  int sample_rate;
  int fft_size; 
  bool noise_gate;
  bool compressor;
  bool adaptive_eq;
  bool pitch_correct; 
  bool auto_gain;
  float reduction_db;
  float crossovers[SPECTRAL_BAND_COUNT - 1];
  float thresholds_db[SPECTRAL_BAND_COUNT];
  float ratios[SPECTRAL_BAND_COUNT];
} spectral_config_t;
 
spectral_config_t spectral_default_config(int sample_rate);
asciichat_error_t spectral_create(const spectral_config_t *config, spectral_processor_t **out);
void spectral_destroy(spectral_processor_t *processor);
void spectral_reset(spectral_processor_t *processor);
asciichat_error_t spectral_process(spectral_processor_t *processor, const float *input, float *output, size_t count);
float spectral_pitch_hz(const spectral_processor_t *processor);
const float *spectral_spectrum(const spectral_processor_t *processor, size_t *bins);
 
#ifdef __cplusplus
}
#endif