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/*
* ECHO_CAN_JPAH
*
* 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) 2007-2012, Digium, Inc.
*
* All rights reserved.
*
*/
/*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2 as published by the
* Free Software Foundation. See the LICENSE file included with
* this program for more details.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ctype.h>
#include <linux/moduleparam.h>
#include <dahdi/kernel.h>
static int debug;
static int echo_can_create(struct dahdi_chan *chan, struct dahdi_echocanparams *ecp,
struct dahdi_echocanparam *p, struct dahdi_echocan_state **ec);
static void echo_can_free(struct dahdi_chan *chan, struct dahdi_echocan_state *ec);
static void echo_can_process(struct dahdi_echocan_state *ec, short *isig, const short *iref, u32 size);
static int echo_can_traintap(struct dahdi_echocan_state *ec, int pos, short val);
static const char *name = "JPAH";
static const char *ec_name(const struct dahdi_chan *chan) { return name; }
static const struct dahdi_echocan_factory my_factory = {
.get_name = ec_name,
.owner = THIS_MODULE,
.echocan_create = echo_can_create,
};
static const struct dahdi_echocan_ops my_ops = {
.echocan_free = echo_can_free,
.echocan_process = echo_can_process,
.echocan_traintap = echo_can_traintap,
};
struct ec_pvt {
struct dahdi_echocan_state dahdi;
int blah;
};
#define dahdi_to_pvt(a) container_of(a, struct ec_pvt, dahdi)
static int echo_can_create(struct dahdi_chan *chan, struct dahdi_echocanparams *ecp,
struct dahdi_echocanparam *p, struct dahdi_echocan_state **ec)
{
struct ec_pvt *pvt;
if (ecp->param_count > 0) {
printk(KERN_WARNING "JPAH does not support parameters; failing request\n");
return -EINVAL;
}
pvt = kzalloc(sizeof(*pvt), GFP_KERNEL);
if (!pvt)
return -ENOMEM;
pvt->dahdi.ops = &my_ops;
*ec = &pvt->dahdi;
return 0;
}
static void echo_can_free(struct dahdi_chan *chan, struct dahdi_echocan_state *ec)
{
struct ec_pvt *pvt = dahdi_to_pvt(ec);
kfree(pvt);
}
static void echo_can_process(struct dahdi_echocan_state *ec, short *isig, const short *iref, u32 size)
{
struct ec_pvt *pvt = dahdi_to_pvt(ec);
u32 x;
for (x = 0; x < size; x++) {
if (pvt->blah < 2) {
pvt->blah++;
*isig++ = 0;
} else {
pvt->blah = 0;
isig++;
}
}
}
static int echo_can_traintap(struct dahdi_echocan_state *ec, int pos, short val)
{
return 0;
}
static int __init mod_init(void)
{
if (dahdi_register_echocan_factory(&my_factory)) {
module_printk(KERN_ERR, "could not register with DAHDI core\n");
return -EPERM;
}
module_printk(KERN_NOTICE, "Registered echo canceler '%s'\n",
my_factory.get_name(NULL));
return 0;
}
static void __exit mod_exit(void)
{
dahdi_unregister_echocan_factory(&my_factory);
}
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_DESCRIPTION("DAHDI Jason Parker Audio Hoser");
MODULE_AUTHOR("Jason Parker <jparker@digium.com>");
MODULE_LICENSE("GPL v2");
module_init(mod_init);
module_exit(mod_exit);
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