func_volume.c
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00033 #include "asterisk.h"
00034
00035 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 411313 $")
00036
00037 #include "asterisk/module.h"
00038 #include "asterisk/channel.h"
00039 #include "asterisk/pbx.h"
00040 #include "asterisk/utils.h"
00041 #include "asterisk/audiohook.h"
00042 #include "asterisk/app.h"
00043
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00073 struct volume_information {
00074 struct ast_audiohook audiohook;
00075 int tx_gain;
00076 int rx_gain;
00077 unsigned int flags;
00078 };
00079
00080 enum volume_flags {
00081 VOLUMEFLAG_CHANGE = (1 << 1),
00082 };
00083
00084 AST_APP_OPTIONS(volume_opts, {
00085 AST_APP_OPTION('p', VOLUMEFLAG_CHANGE),
00086 });
00087
00088 static void destroy_callback(void *data)
00089 {
00090 struct volume_information *vi = data;
00091
00092
00093 ast_audiohook_lock(&vi->audiohook);
00094 ast_audiohook_detach(&vi->audiohook);
00095 ast_audiohook_unlock(&vi->audiohook);
00096 ast_audiohook_destroy(&vi->audiohook);
00097 ast_free(vi);
00098
00099 return;
00100 }
00101
00102
00103 static const struct ast_datastore_info volume_datastore = {
00104 .type = "volume",
00105 .destroy = destroy_callback
00106 };
00107
00108 static int volume_callback(struct ast_audiohook *audiohook, struct ast_channel *chan, struct ast_frame *frame, enum ast_audiohook_direction direction)
00109 {
00110 struct ast_datastore *datastore = NULL;
00111 struct volume_information *vi = NULL;
00112 int *gain = NULL;
00113
00114
00115 if (audiohook->status == AST_AUDIOHOOK_STATUS_DONE)
00116 return 0;
00117
00118
00119 if (!(datastore = ast_channel_datastore_find(chan, &volume_datastore, NULL)))
00120 return 0;
00121
00122 vi = datastore->data;
00123
00124
00125 if (ast_test_flag(vi, VOLUMEFLAG_CHANGE)) {
00126 if (frame->frametype == AST_FRAME_DTMF) {
00127
00128 if (direction != AST_AUDIOHOOK_DIRECTION_READ)
00129 return 0;
00130 if (frame->subclass.integer == '*') {
00131 vi->tx_gain += 1;
00132 vi->rx_gain += 1;
00133 } else if (frame->subclass.integer == '#') {
00134 vi->tx_gain -= 1;
00135 vi->rx_gain -= 1;
00136 }
00137 }
00138 }
00139
00140
00141 if (frame->frametype == AST_FRAME_VOICE) {
00142
00143 if (!(gain = (direction == AST_AUDIOHOOK_DIRECTION_READ) ? &vi->rx_gain : &vi->tx_gain) || !*gain)
00144 return 0;
00145
00146 ast_frame_adjust_volume(frame, *gain);
00147 }
00148
00149 return 0;
00150 }
00151
00152 static int volume_write(struct ast_channel *chan, const char *cmd, char *data, const char *value)
00153 {
00154 struct ast_datastore *datastore = NULL;
00155 struct volume_information *vi = NULL;
00156 int is_new = 0;
00157
00158
00159
00160 AST_DECLARE_APP_ARGS(args,
00161 AST_APP_ARG(direction);
00162 AST_APP_ARG(options);
00163 );
00164
00165 if (!chan) {
00166 ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
00167 return -1;
00168 }
00169
00170 AST_STANDARD_APP_ARGS(args, data);
00171
00172 ast_channel_lock(chan);
00173 if (!(datastore = ast_channel_datastore_find(chan, &volume_datastore, NULL))) {
00174 ast_channel_unlock(chan);
00175
00176 if (!(datastore = ast_datastore_alloc(&volume_datastore, NULL)))
00177 return 0;
00178 if (!(vi = ast_calloc(1, sizeof(*vi)))) {
00179 ast_datastore_free(datastore);
00180 return 0;
00181 }
00182 ast_audiohook_init(&vi->audiohook, AST_AUDIOHOOK_TYPE_MANIPULATE, "Volume");
00183 vi->audiohook.manipulate_callback = volume_callback;
00184 ast_set_flag(&vi->audiohook, AST_AUDIOHOOK_WANTS_DTMF);
00185 is_new = 1;
00186 } else {
00187 ast_channel_unlock(chan);
00188 vi = datastore->data;
00189 }
00190
00191
00192 if (ast_strlen_zero(args.direction)) {
00193 ast_log(LOG_ERROR, "Direction must be specified for VOLUME function\n");
00194 return -1;
00195 }
00196
00197 if (!strcasecmp(args.direction, "tx")) {
00198 vi->tx_gain = atoi(value);
00199 } else if (!strcasecmp(args.direction, "rx")) {
00200 vi->rx_gain = atoi(value);
00201 } else {
00202 ast_log(LOG_ERROR, "Direction must be either RX or TX\n");
00203 }
00204
00205 if (is_new) {
00206 datastore->data = vi;
00207 ast_channel_lock(chan);
00208 ast_channel_datastore_add(chan, datastore);
00209 ast_channel_unlock(chan);
00210 ast_audiohook_attach(chan, &vi->audiohook);
00211 }
00212
00213
00214
00215 if (!ast_strlen_zero(args.options)) {
00216 struct ast_flags flags = { 0 };
00217 ast_app_parse_options(volume_opts, &flags, NULL, args.options);
00218 vi->flags = flags.flags;
00219 } else {
00220 vi->flags = 0;
00221 }
00222
00223 return 0;
00224 }
00225
00226 static struct ast_custom_function volume_function = {
00227 .name = "VOLUME",
00228 .write = volume_write,
00229 };
00230
00231 static int unload_module(void)
00232 {
00233 return ast_custom_function_unregister(&volume_function);
00234 }
00235
00236 static int load_module(void)
00237 {
00238 return ast_custom_function_register(&volume_function);
00239 }
00240
00241 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Technology independent volume control");