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/usr/include/rem/rem_autone.h is in librem-dev 0.4.7-1.

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/**
 * @file rem_autone.h Audio Tones
 *
 * Copyright (C) 2010 Creytiv.com
 */


int autone_sine(struct mbuf *mb, uint32_t srate,
		uint32_t f1, int l1, uint32_t f2, int l2);
int autone_dtmf(struct mbuf *mb, uint32_t srate, int digit);