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Diffstat (limited to 'trunk/funcs/func_volume.c')
| -rw-r--r-- | trunk/funcs/func_volume.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/trunk/funcs/func_volume.c b/trunk/funcs/func_volume.c new file mode 100644 index 000000000..9a5247f54 --- /dev/null +++ b/trunk/funcs/func_volume.c @@ -0,0 +1,160 @@ +/* + * 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" + +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); + 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 == '*') { + vi->tx_gain += 1; + vi->rx_gain += 1; + } else if (frame->subclass == '#') { + 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_channel_datastore_alloc(&volume_datastore, NULL))) + return 0; + if (!(vi = ast_calloc(1, sizeof(*vi)))) { + ast_channel_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", + .synopsis = "Set the TX or RX volume of a channel", + .syntax = "VOLUME(TX|RX)", + .desc = + " The VOLUME function can be used to increase or decrease the tx or\n" + "rx gain of any channel. For example:\n" + " Set(VOLUME(TX)=3)\n" + " Set(VOLUME(RX)=2)\n", + .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"); |