Wait for Silence
#include "asterisk.h"
#include "asterisk/file.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/dsp.h"
#include "asterisk/module.h"
Go to the source code of this file.
Functions | |
AST_MODULE_INFO_STANDARD (ASTERISK_GPL_KEY,"Wait For Silence") | |
static int | do_waiting (struct ast_channel *chan, int timereqd, time_t waitstart, int timeout, int wait_for_silence) |
static int | load_module (void) |
static int | unload_module (void) |
static int | waitfor_exec (struct ast_channel *chan, const char *data, int wait_for_silence) |
static int | waitfornoise_exec (struct ast_channel *chan, const char *data) |
static int | waitforsilence_exec (struct ast_channel *chan, const char *data) |
Variables | |
static char * | app_noise = "WaitForNoise" |
static char * | app_silence = "WaitForSilence" |
Wait for Silence
Wait For Noise The same as Wait For Silence but listenes noise on the chennel that is above
the pre-configured silence threshold from dsp.conf
Definition in file app_waitforsilence.c.
AST_MODULE_INFO_STANDARD | ( | ASTERISK_GPL_KEY | , | |
"Wait For Silence" | ||||
) |
static int do_waiting | ( | struct ast_channel * | chan, | |
int | timereqd, | |||
time_t | waitstart, | |||
int | timeout, | |||
int | wait_for_silence | |||
) | [static] |
Definition at line 129 of file app_waitforsilence.c.
References ast_debug, ast_dsp_free(), ast_dsp_get_threshold_from_settings(), ast_dsp_new(), ast_dsp_noise(), ast_dsp_set_threshold(), ast_dsp_silence(), AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_frfree, ast_getformatname(), ast_log(), ast_read(), ast_set_read_format(), ast_verb, ast_waitfor(), f, ast_frame::frametype, LOG_WARNING, pbx_builtin_setvar_helper(), ast_channel::readformat, and THRESHOLD_SILENCE.
Referenced by waitfor_exec().
00129 { 00130 struct ast_frame *f = NULL; 00131 int dsptime = 0; 00132 int rfmt = 0; 00133 int res = 0; 00134 struct ast_dsp *sildet; /* silence detector dsp */ 00135 time_t now; 00136 00137 /*Either silence or noise calc depending on wait_for_silence flag*/ 00138 int (*ast_dsp_func)(struct ast_dsp*, struct ast_frame*, int*) = 00139 wait_for_silence ? ast_dsp_silence : ast_dsp_noise; 00140 00141 rfmt = chan->readformat; /* Set to linear mode */ 00142 if ((res = ast_set_read_format(chan, AST_FORMAT_SLINEAR)) < 0) { 00143 ast_log(LOG_WARNING, "Unable to set channel to linear mode, giving up\n"); 00144 return -1; 00145 } 00146 00147 /* Create the silence detector */ 00148 if (!(sildet = ast_dsp_new())) { 00149 ast_log(LOG_WARNING, "Unable to create silence detector :(\n"); 00150 return -1; 00151 } 00152 ast_dsp_set_threshold(sildet, ast_dsp_get_threshold_from_settings(THRESHOLD_SILENCE)); 00153 00154 /* Await silence... */ 00155 for (;;) { 00156 /* Start with no silence received */ 00157 dsptime = 0; 00158 00159 res = ast_waitfor(chan, timereqd); 00160 00161 /* Must have gotten a hangup; let's exit */ 00162 if (res < 0) { 00163 pbx_builtin_setvar_helper(chan, "WAITSTATUS", "HANGUP"); 00164 break; 00165 } 00166 00167 /* We waited and got no frame; sounds like digital silence or a muted digital channel */ 00168 if (res == 0) { 00169 dsptime = timereqd; 00170 } else { 00171 /* Looks like we did get a frame, so let's check it out */ 00172 if (!(f = ast_read(chan))) { 00173 pbx_builtin_setvar_helper(chan, "WAITSTATUS", "HANGUP"); 00174 break; 00175 } 00176 if (f->frametype == AST_FRAME_VOICE) { 00177 ast_dsp_func(sildet, f, &dsptime); 00178 } 00179 ast_frfree(f); 00180 } 00181 00182 ast_verb(6, "Got %dms %s < %dms required\n", dsptime, wait_for_silence ? "silence" : "noise", timereqd); 00183 00184 if (dsptime >= timereqd) { 00185 ast_verb(3, "Exiting with %dms %s >= %dms required\n", dsptime, wait_for_silence ? "silence" : "noise", timereqd); 00186 /* Ended happily with silence */ 00187 res = 1; 00188 pbx_builtin_setvar_helper(chan, "WAITSTATUS", wait_for_silence ? "SILENCE" : "NOISE"); 00189 ast_debug(1, "WAITSTATUS was set to %s\n", wait_for_silence ? "SILENCE" : "NOISE"); 00190 break; 00191 } 00192 00193 if (timeout && (difftime(time(&now), waitstart) >= timeout)) { 00194 pbx_builtin_setvar_helper(chan, "WAITSTATUS", "TIMEOUT"); 00195 ast_debug(1, "WAITSTATUS was set to TIMEOUT\n"); 00196 res = 0; 00197 break; 00198 } 00199 } 00200 00201 00202 if (rfmt && ast_set_read_format(chan, rfmt)) { 00203 ast_log(LOG_WARNING, "Unable to restore format %s to channel '%s'\n", ast_getformatname(rfmt), chan->name); 00204 } 00205 ast_dsp_free(sildet); 00206 return res; 00207 }
static int load_module | ( | void | ) | [static] |
Definition at line 267 of file app_waitforsilence.c.
References ast_register_application_xml, waitfornoise_exec(), and waitforsilence_exec().
00268 { 00269 int res; 00270 00271 res = ast_register_application_xml(app_silence, waitforsilence_exec); 00272 res |= ast_register_application_xml(app_noise, waitfornoise_exec); 00273 return res; 00274 }
static int unload_module | ( | void | ) | [static] |
Definition at line 258 of file app_waitforsilence.c.
References ast_unregister_application().
00259 { 00260 int res; 00261 res = ast_unregister_application(app_silence); 00262 res |= ast_unregister_application(app_noise); 00263 00264 return res; 00265 }
static int waitfor_exec | ( | struct ast_channel * | chan, | |
const char * | data, | |||
int | wait_for_silence | |||
) | [static] |
Definition at line 209 of file app_waitforsilence.c.
References ast_channel::_state, ast_answer(), ast_channel_start_silence_generator(), ast_channel_stop_silence_generator(), ast_log(), ast_opt_transmit_silence, AST_STATE_UP, ast_verb, do_waiting(), and LOG_WARNING.
Referenced by waitfornoise_exec(), and waitforsilence_exec().
00210 { 00211 int res = 1; 00212 int timereqd = 1000; 00213 int timeout = 0; 00214 int iterations = 1, i; 00215 time_t waitstart; 00216 struct ast_silence_generator *silgen = NULL; 00217 00218 if (chan->_state != AST_STATE_UP) { 00219 res = ast_answer(chan); /* Answer the channel */ 00220 } 00221 00222 if (!data || ( (sscanf(data, "%30d,%30d,%30d", &timereqd, &iterations, &timeout) != 3) && 00223 (sscanf(data, "%30d,%30d", &timereqd, &iterations) != 2) && 00224 (sscanf(data, "%30d", &timereqd) != 1) ) ) { 00225 ast_log(LOG_WARNING, "Using default value of 1000ms, 1 iteration, no timeout\n"); 00226 } 00227 00228 ast_verb(3, "Waiting %d time(s) for %d ms silence with %d timeout\n", iterations, timereqd, timeout); 00229 00230 if (ast_opt_transmit_silence) { 00231 silgen = ast_channel_start_silence_generator(chan); 00232 } 00233 time(&waitstart); 00234 res = 1; 00235 for (i=0; (i<iterations) && (res == 1); i++) { 00236 res = do_waiting(chan, timereqd, waitstart, timeout, wait_for_silence); 00237 } 00238 if (silgen) { 00239 ast_channel_stop_silence_generator(chan, silgen); 00240 } 00241 00242 00243 if (res > 0) 00244 res = 0; 00245 return res; 00246 }
static int waitfornoise_exec | ( | struct ast_channel * | chan, | |
const char * | data | |||
) | [static] |
Definition at line 253 of file app_waitforsilence.c.
References waitfor_exec().
Referenced by load_module().
00254 { 00255 return waitfor_exec(chan, data, 0); 00256 }
static int waitforsilence_exec | ( | struct ast_channel * | chan, | |
const char * | data | |||
) | [static] |
Definition at line 248 of file app_waitforsilence.c.
References waitfor_exec().
Referenced by load_module().
00249 { 00250 return waitfor_exec(chan, data, 1); 00251 }
char* app_noise = "WaitForNoise" [static] |
Definition at line 127 of file app_waitforsilence.c.
char* app_silence = "WaitForSilence" [static] |
Definition at line 126 of file app_waitforsilence.c.