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typedef struct compandor {
struct {
double unaffected;
double step_up;
double step_down;
double peak;
double envelope;
} c;
struct {
double unaffected;
double step_up;
double step_down;
double peak;
double envelope;
} e;
} compandor_t;
void init_compandor(compandor_t *state, int samplerate, double attack_ms, double recovery_ms, double unaffected_level);
void compress_audio(compandor_t *state, sample_t *samples, int num);
void expand_audio(compandor_t *state, sample_t *samples, int num);
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