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/*
* ECHO_CAN_JP1
*
* by Jason Parker
*
* Based upon mg2ec.h - sort of.
* This "echo can" will completely hose your audio.
* Don't use it unless you're absolutely sure you know what you're doing.
*
* Copyright (C) 2007, Digium, Inc.
*
* This program is free software and may be used and
* distributed according to the terms of the GNU
* General Public License, incorporated herein by
* reference.
*
*/
#ifndef _JP_ECHO_H
#define _JP_ECHO_H
#ifdef __KERNEL__
#include <linux/kernel.h>
#include <linux/slab.h>
#define MALLOC(a) kmalloc((a), GFP_KERNEL)
#define FREE(a) kfree(a)
#else
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#define MALLOC(a) malloc(a)
#define FREE(a) free(a)
#endif
/* Echo canceller definition */
struct echo_can_state {
/* an arbitrary ID for this echo can - this really should be settable from the calling channel... */
int id;
/* absolute time - aka. sample number index - essentially the number of samples since this can was init'ed */
int i_d;
};
static void echo_can_init(void)
{
printk("Zaptel Audio Hoser: JP1\n");
}
static void echo_can_identify(char *buf, size_t len)
{
strncpy(buf, "JP1", len);
}
static void echo_can_shutdown(void)
{
}
static inline void init_cc(struct echo_can_state *ec)
{
void *ptr = ec;
unsigned long tmp;
/* Double-word align past end of state */
ptr += sizeof(struct echo_can_state);
tmp = (unsigned long)ptr;
tmp += 3;
tmp &= ~3L;
ptr = (void *)tmp;
}
static inline void echo_can_free(struct echo_can_state *ec)
{
FREE(ec);
}
static inline short echo_can_update(struct echo_can_state *ec, short iref, short isig)
{
static int blah = 0;
if (blah < 2) {
blah++;
return 0;
} else {
blah = (blah + 1) % 3;
return isig;
}
}
static inline struct echo_can_state *echo_can_create(int len, int adaption_mode)
{
struct echo_can_state *ec;
ec = (struct echo_can_state *)MALLOC(sizeof(struct echo_can_state) + 4); /* align */
if (ec) {
memset(ec, 0, sizeof(struct echo_can_state) + 4); /* align */
init_cc(ec);
}
return ec;
}
static inline int echo_can_traintap(struct echo_can_state *ec, int pos, short val)
{
return 0;
}
#endif
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