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typedef struct compander {
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;
} compander_t;
void init_compander(compander_t *state, int samplerate, double attack_ms, double recovery_ms, int unaffected_level);
void compress_audio(compander_t *state, int16_t *samples, int num);
void expand_audio(compander_t *state, int16_t *samples, int num);
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