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typedef struct dtmf {
int samplerate; /* samplerate */
char tone; /* current tone to be played */
int pos; /* sample counter for tone */
int max; /* max number of samples for tone duration */
double phaseshift256[2]; /* how much the phase of sine wave changes per sample */
double phase256[2]; /* current phase */
} dtmf_t;
void dtmf_init(dtmf_t *dtmf, int samplerate);
void dtmf_set_tone(dtmf_t *dtmf, char tone);
void dtmf_tone(dtmf_t *dtmf, int16_t *samples, int length);
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