audiovario.h

#ifndef AUDIOVARIO
#define AUDIOVARIO

#define FORMAT PA_SAMPLE_S16LE
#define RATE 44100
#define BUFFER_SIZE 8192

#define DEADBAND_LOW -0.0
#define DEADBAND_HIGH 0.0  /*DEADBAND: Vario remains silent for DEADBAND_LOW < TE value < DEADBAND_HIGH */
#define PULSE_LENGTH  48000 /*LENGTH of PULSE (PAUSE) for positive TE values, in samples*/
#define PULSE_LENGTH_GAIN  1 /*PULSES get shorter with higher TE values*/
#define PULSE_DUTY  2.6 /*Pulse duty cycle 2*PI == 100%*/
#define PULSE_RISE 0.3 /*Timing for rising edge of pulse (Fade-In)*/
#define PULSE_FALL 0.3 /*Timing for falling edge of pulse (Fade-Out)*/
#define BASE_FREQ_POS 350   /*BASE frequency for positive TE values in Hz*/
#define BASE_FREQ_NEG 350  /*BASE frequency for negative TE values in Hz*/
#define FREQ_GAIN_POS 120
#define FREQ_GAIN_NEG 0.85

#define STF_DEADBAND_LOW -2.5
#define STF_DEADBAND_HIGH 2.5  /*DEADBAND: Vario remains silent for DEADBAND_LOW < TE value < DEADBAND_HIGH */
#define STF_PULSE_LENGTH  48000 /*LENGTH of PULSE (PAUSE) for positive values, in samples*/
#define STF_PULSE_LENGTH_GAIN  0.2 /*PULSES get shorter with higher values*/
#define STF_PULSE_DUTY  2.6 /*Pulse duty cycle 2*PI == 100%*/
#define STF_PULSE_RISE 0.1 /*Timing for rising edge of pulse (Fade-In)*/
#define STF_PULSE_FALL 0.1 /*Timing for falling edge of pulse (Fade-Out)*/
#define STF_BASE_FREQ_POS 350   /*BASE frequency for positive TE values in Hz*/
#define STF_BASE_FREQ_NEG 350  /*BASE frequency for negative TE values in Hz*/
#define STF_FREQ_GAIN_POS 30
#define STF_FREQ_GAIN_NEG 0.1

enum e_vario_mode{
	vario = 0,
	stf   = 1
};

typedef struct{
	float deadband_low;
	float deadband_high;
	int pulse_length;
	float pulse_length_gain;
	float pulse_duty;
	float pulse_rise;
	float pulse_risei;
	float pulse_riseiv;
	float pulse_fall;
	float pulse_falli;
	float pulse_falliv;
	float pulse_riseduty;
	float pulse_risedutyfall;
	float base_freq_pos;
	float base_freq_neg;
	float loval;
	float hival;
	float freq_gain_pos;
	float freq_gain_neg;
} t_vario_config;

extern t_vario_config vario_config[2];
extern enum e_vario_mode vario_mode;

void toggle_mute(void);
void vario_mute(void);
void vario_unmute(void);
float change_volume(float delta);
float triangle(float phase );
void start_pcm(void);
void init_vario_config(void);

t_vario_config* get_vario_config(enum e_vario_mode mode);
void set_audio_val(float val);
void set_vario_mode(enum e_vario_mode mode);
#endif