18 lines
743 B
C
18 lines
743 B
C
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typedef struct dtmf_enc {
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int samplerate; /* samplerate */
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char tone; /* current tone to be played */
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int on, off; /* samples to turn on and afterwards off */
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int pos; /* sample counter for tone */
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int max; /* max number of samples for tone duration */
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double phaseshift65536[2]; /* how much the phase of sine wave changes per sample */
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double phase65536[2]; /* current phase */
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sample_t sine_low[65536]; /* sine tables at individual levels */
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sample_t sine_high[65536];
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} dtmf_enc_t;
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void dtmf_encode_init(dtmf_enc_t *dtmf, int samplerate, double dBm_level);
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int dtmf_encode_set_tone(dtmf_enc_t *dtmf, char tone, double on_duration, double off_duration);
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int dtmf_encode(dtmf_enc_t *dtmf, sample_t *samples, int length);
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