![kpfleming](/assets/img/avatar_default.png)
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@135680 f38db490-d61c-443f-a65b-d21fe96a405b
161 lines
4.4 KiB
C
161 lines
4.4 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2007, Digium, Inc.
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*
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* Joshua Colp <jcolp@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Technology independent volume control
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*
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* \author Joshua Colp <jcolp@digium.com>
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*
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* \ingroup functions
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*
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/module.h"
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#include "asterisk/channel.h"
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#include "asterisk/pbx.h"
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#include "asterisk/utils.h"
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#include "asterisk/audiohook.h"
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struct volume_information {
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struct ast_audiohook audiohook;
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int tx_gain;
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int rx_gain;
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};
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static void destroy_callback(void *data)
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{
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struct volume_information *vi = data;
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/* Destroy the audiohook, and destroy ourselves */
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ast_audiohook_destroy(&vi->audiohook);
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free(vi);
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return;
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}
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/*! \brief Static structure for datastore information */
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static const struct ast_datastore_info volume_datastore = {
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.type = "volume",
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.destroy = destroy_callback
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};
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static int volume_callback(struct ast_audiohook *audiohook, struct ast_channel *chan, struct ast_frame *frame, enum ast_audiohook_direction direction)
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{
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struct ast_datastore *datastore = NULL;
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struct volume_information *vi = NULL;
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int *gain = NULL;
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/* If the audiohook is stopping it means the channel is shutting down.... but we let the datastore destroy take care of it */
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if (audiohook->status == AST_AUDIOHOOK_STATUS_DONE)
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return 0;
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/* Grab datastore which contains our gain information */
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if (!(datastore = ast_channel_datastore_find(chan, &volume_datastore, NULL)))
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return 0;
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vi = datastore->data;
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/* If this is DTMF then allow them to increase/decrease the gains */
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if (frame->frametype == AST_FRAME_DTMF) {
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/* Only use DTMF coming from the source... not going to it */
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if (direction != AST_AUDIOHOOK_DIRECTION_READ)
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return 0;
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if (frame->subclass == '*') {
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vi->tx_gain += 1;
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vi->rx_gain += 1;
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} else if (frame->subclass == '#') {
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vi->tx_gain -= 1;
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vi->rx_gain -= 1;
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}
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} else if (frame->frametype == AST_FRAME_VOICE) {
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/* Based on direction of frame grab the gain, and confirm it is applicable */
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if (!(gain = (direction == AST_AUDIOHOOK_DIRECTION_READ) ? &vi->rx_gain : &vi->tx_gain) || !*gain)
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return 0;
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/* Apply gain to frame... easy as pi */
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ast_frame_adjust_volume(frame, *gain);
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}
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return 0;
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}
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static int volume_write(struct ast_channel *chan, const char *cmd, char *data, const char *value)
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{
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struct ast_datastore *datastore = NULL;
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struct volume_information *vi = NULL;
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int is_new = 0;
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if (!(datastore = ast_channel_datastore_find(chan, &volume_datastore, NULL))) {
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/* Allocate a new datastore to hold the reference to this volume and audiohook information */
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if (!(datastore = ast_datastore_alloc(&volume_datastore, NULL)))
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return 0;
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if (!(vi = ast_calloc(1, sizeof(*vi)))) {
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ast_datastore_free(datastore);
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return 0;
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}
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ast_audiohook_init(&vi->audiohook, AST_AUDIOHOOK_TYPE_MANIPULATE, "Volume");
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vi->audiohook.manipulate_callback = volume_callback;
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ast_set_flag(&vi->audiohook, AST_AUDIOHOOK_WANTS_DTMF);
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is_new = 1;
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} else {
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vi = datastore->data;
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}
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/* Adjust gain on volume information structure */
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if (!strcasecmp(data, "tx"))
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vi->tx_gain = atoi(value);
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else if (!strcasecmp(data, "rx"))
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vi->rx_gain = atoi(value);
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if (is_new) {
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datastore->data = vi;
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ast_channel_datastore_add(chan, datastore);
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ast_audiohook_attach(chan, &vi->audiohook);
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}
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return 0;
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}
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static struct ast_custom_function volume_function = {
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.name = "VOLUME",
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.synopsis = "Set the TX or RX volume of a channel",
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.syntax = "VOLUME(TX|RX)",
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.desc =
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" The VOLUME function can be used to increase or decrease the tx or\n"
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"rx gain of any channel. For example:\n"
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" Set(VOLUME(TX)=3)\n"
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" Set(VOLUME(RX)=2)\n",
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.write = volume_write,
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};
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static int unload_module(void)
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{
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return ast_custom_function_unregister(&volume_function);
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}
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static int load_module(void)
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{
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return ast_custom_function_register(&volume_function);
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Technology independent volume control");
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