* Convert some spaces to tabs in func_volume * Add a note in channel.h making it clear that none of the datastore API calls lock the channel they are given, so the channel should be locked before calling the functions that take a channel argument. git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@81260 65c4cc65-6c06-0410-ace0-fbb531ad65f3
164 lines
4.5 KiB
C
164 lines
4.5 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 <stdlib.h>
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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/linkedlists.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_channel_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_channel_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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