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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2007, Digium, Inc.
*
* Joshua Colp <jcolp@digium.com>
*
* 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. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Technology independent volume control
*
* \author Joshua Colp <jcolp@digium.com>
*
* \ingroup functions
*
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/utils.h"
#include "asterisk/audiohook.h"
/*** DOCUMENTATION
<function name="VOLUME" language="en_US">
<synopsis>
Set the TX or RX volume of a channel.
</synopsis>
<syntax>
<parameter name="direction" required="true">
<para>Must be <literal>TX</literal> or <literal>RX</literal>.</para>
</parameter>
</syntax>
<description>
<para>The VOLUME function can be used to increase or decrease the <literal>tx</literal> or
<literal>rx</literal> gain of any channel.</para>
<para>For example:</para>
<para>Set(VOLUME(TX)=3)</para>
<para>Set(VOLUME(RX)=2)</para>
</description>
</function>
***/
struct volume_information {
struct ast_audiohook audiohook;
int tx_gain;
int rx_gain;
};
static void destroy_callback(void *data)
{
struct volume_information *vi = data;
/* Destroy the audiohook, and destroy ourselves */
ast_audiohook_destroy(&vi->audiohook);
ast_free(vi);
return;
}
/*! \brief Static structure for datastore information */
static const struct ast_datastore_info volume_datastore = {
.type = "volume",
.destroy = destroy_callback
};
static int volume_callback(struct ast_audiohook *audiohook, struct ast_channel *chan, struct ast_frame *frame, enum ast_audiohook_direction direction)
{
struct ast_datastore *datastore = NULL;
struct volume_information *vi = NULL;
int *gain = NULL;
/* If the audiohook is stopping it means the channel is shutting down.... but we let the datastore destroy take care of it */
if (audiohook->status == AST_AUDIOHOOK_STATUS_DONE)
return 0;
/* Grab datastore which contains our gain information */
if (!(datastore = ast_channel_datastore_find(chan, &volume_datastore, NULL)))
return 0;
vi = datastore->data;
/* If this is DTMF then allow them to increase/decrease the gains */
if (frame->frametype == AST_FRAME_DTMF) {
/* Only use DTMF coming from the source... not going to it */
if (direction != AST_AUDIOHOOK_DIRECTION_READ)
return 0;
if (frame->subclass.integer == '*') {
vi->tx_gain += 1;
vi->rx_gain += 1;
} else if (frame->subclass.integer == '#') {
vi->tx_gain -= 1;
vi->rx_gain -= 1;
}
} else if (frame->frametype == AST_FRAME_VOICE) {
/* Based on direction of frame grab the gain, and confirm it is applicable */
if (!(gain = (direction == AST_AUDIOHOOK_DIRECTION_READ) ? &vi->rx_gain : &vi->tx_gain) || !*gain)
return 0;
/* Apply gain to frame... easy as pi */
ast_frame_adjust_volume(frame, *gain);
}
return 0;
}
static int volume_write(struct ast_channel *chan, const char *cmd, char *data, const char *value)
{
struct ast_datastore *datastore = NULL;
struct volume_information *vi = NULL;
int is_new = 0;
if (!(datastore = ast_channel_datastore_find(chan, &volume_datastore, NULL))) {
/* Allocate a new datastore to hold the reference to this volume and audiohook information */
if (!(datastore = ast_datastore_alloc(&volume_datastore, NULL)))
return 0;
if (!(vi = ast_calloc(1, sizeof(*vi)))) {
ast_datastore_free(datastore);
return 0;
}
ast_audiohook_init(&vi->audiohook, AST_AUDIOHOOK_TYPE_MANIPULATE, "Volume");
vi->audiohook.manipulate_callback = volume_callback;
ast_set_flag(&vi->audiohook, AST_AUDIOHOOK_WANTS_DTMF);
is_new = 1;
} else {
vi = datastore->data;
}
/* Adjust gain on volume information structure */
if (!strcasecmp(data, "tx"))
vi->tx_gain = atoi(value);
else if (!strcasecmp(data, "rx"))
vi->rx_gain = atoi(value);
if (is_new) {
datastore->data = vi;
ast_channel_datastore_add(chan, datastore);
ast_audiohook_attach(chan, &vi->audiohook);
}
return 0;
}
static struct ast_custom_function volume_function = {
.name = "VOLUME",
.write = volume_write,
};
static int unload_module(void)
{
return ast_custom_function_unregister(&volume_function);
}
static int load_module(void)
{
return ast_custom_function_register(&volume_function);
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Technology independent volume control");
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