myvtm/Other/unix/libaudioframework/audiotone.h

#ifndef __AUDIOTONE_H__
#define __AUDIOTONE_H__

#pragma once

#ifdef __cplusplus
extern "C" {
#endif

#include <apr_general.h>

#include "audiostream.h"

struct gen 
{
	float a, s0, s1;
};

struct gen_state
{
	struct gen tone1;
	struct gen tone2;
	int has_tone2;
};

typedef struct audiotone_t {
	audiostream_t base;
	int		options;
	int		playback_options;
	int		fade_in_len;	/* fade in for this # of samples */
	int		fade_out_len;	/* fade out for this # of samples*/

	int clock;
	int ptime;

	/* Tone generation state */
	struct gen_state	state;

	int dig_fi;
	int		dig_samples;	    /* sample pos in cur digit	*/
	int freq1;
	int freq2;
	int on_msec;
	int off_msec;
	int volume;
	int flags;

	CRITICAL_SECTION lock;

}audiotone_t;

#define TONEGEN_LOOP 1

apr_status_t audiotone_create(apr_pool_t *pool,
							  audioengine_t *engine, 
							  int options, 
							  int clock, 
							  int ptime, 
							  audiotone_t **p_tone);

void audiotone_destroy(audiotone_t *tone);

// Volume (1-32767), or 0 for default
apr_status_t audiotone_play_start_digit(audiotone_t *tone, 
										int digit, 
										int on_msec, 
										int off_msec, 
										int volume, 
										int options);

// freq 2 can be Optional
apr_status_t audiotone_play_start_tone(audiotone_t *tone, 
									   int freq1, 
									   int freq2, 
									   int on_msec, 
									   int off_msec, 
									   int volume,
									   int options);

// stop play
apr_status_t audiotone_play_end(audiotone_t *tone);

#ifdef __cplusplus
} // extern "C" {
#endif

#endif //__AUDIOTONE_H__