49 lines
1.9 KiB
C
49 lines
1.9 KiB
C
#include "../common/sender.h"
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enum dsp_mode {
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DSP_MODE_SILENCE, /* send silence to transmitter, block audio from receiver */
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DSP_MODE_AUDIO, /* stream audio */
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DSP_MODE_TONE, /* send 2280 Hz tone 0 */
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DSP_MODE_PAGING, /* send four paging tones */
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};
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enum anetz_state {
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ANETZ_FREI, /* sending 2280 Hz tone */
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ANETZ_GESPRAECH, /* during conversation */
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ANETZ_ANRUF, /* phone is paged */
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ANETZ_AUSLOESEN, /* releasing towards phone */
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};
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typedef struct anetz {
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sender_t sender;
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/* sender's states */
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enum anetz_state state; /* current sender's state */
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char station_id[8]; /* current station ID */
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struct timer timer;
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/* dsp states */
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enum dsp_mode dsp_mode; /* current mode: audio, durable tone 0 or 1, paging */
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int fsk_tone_coeff; /* coefficient k = 2*cos(2*PI*f/samplerate), k << 15 */
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int samples_per_chunk; /* how many samples lasts one chunk */
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int16_t *fsk_filter_spl; /* array with samples_per_chunk */
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int fsk_filter_pos; /* current sample position in filter_spl */
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int tone_detected; /* what tone has been detected */
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int tone_count; /* how long has that tone been detected */
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double tone_phaseshift256; /* how much the phase of sine wave changes per sample */
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double tone_phase256; /* current phase */
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double paging_phaseshift256[4];/* how much the phase of sine wave changes per sample */
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double paging_phase256[4]; /* current phase */
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int paging_tone; /* current tone (0..3) in sequenced mode */
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int paging_count; /* current sample count of tone in seq. mode */
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} anetz_t;
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double anetz_kanal2freq(int kanal, int unterband);
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int anetz_init(void);
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int anetz_create(const char *sounddev, int samplerate, const char *write_wave, const char *read_wave, int kanal, int loopback, double loss_volume);
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void anetz_destroy(sender_t *sender);
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void anetz_loss_indication(anetz_t *anetz);
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void anetz_receive_tone(anetz_t *anetz, int bit);
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