Add WaitForSilence application (bug #2467)
authorMark Spencer <markster@digium.com>
Wed, 24 Nov 2004 05:01:49 +0000 (05:01 +0000)
committerMark Spencer <markster@digium.com>
Wed, 24 Nov 2004 05:01:49 +0000 (05:01 +0000)
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4329 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/Makefile
apps/app_waitforsilence.c [new file with mode: 0755]

index 449379b..a50ac80 100755 (executable)
@@ -30,7 +30,7 @@ APPS=app_dial.so app_playback.so app_voicemail.so app_directory.so app_mp3.so\
      app_groupcount.so app_txtcidname.so app_controlplayback.so \
      app_talkdetect.so app_alarmreceiver.so app_userevent.so app_verbose.so \
      app_test.so app_forkcdr.so app_math.so app_realtime.so \
-     app_dumpchan.so
+     app_dumpchan.so app_waitforsilence.so
 
 ifneq (${OSARCH},Darwin)
 APPS+=app_intercom.so
diff --git a/apps/app_waitforsilence.c b/apps/app_waitforsilence.c
new file mode 100755 (executable)
index 0000000..b29286a
--- /dev/null
@@ -0,0 +1,168 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ * 
+ * Copyright (C) 1999-2004, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.com>
+ *
+ * Wait for Silence
+ *   - Waits for up to 'x' milliseconds of silence, 'y' times
+ *   - WaitForSilence(500,2) will wait for 1/2 second of silence, twice
+ *   - WaitForSilence(1000,1) will wait for 1 second of silence, once
+ *
+ * WaitForSilence Application by David C. Troy <dave@popvox.com>
+ * Version 1.00 2004-01-29
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+#include <asterisk/file.h>
+#include <asterisk/logger.h>
+#include <asterisk/channel.h>
+#include <asterisk/pbx.h>
+#include <asterisk/dsp.h>
+#include <asterisk/module.h>
+#include <asterisk/options.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <pthread.h>
+
+static char *tdesc = "Wait For Silence";
+static char *app = "WaitForSilence";
+static char *synopsis = "Waits for a specified amount of silence";
+static char *descrip = 
+"  WaitForSilence(x[|y]) Wait for Silence: Waits for up to 'x' \n"
+"milliseconds of silence, 'y' times or 1 if omitted\n"
+"Examples:\n"
+"  - WaitForSilence(500,2) will wait for 1/2 second of silence, twice\n"
+"  - WaitForSilence(1000) will wait for 1 second of silence, once\n";
+
+STANDARD_LOCAL_USER;
+
+LOCAL_USER_DECL;
+
+static int do_waiting(struct ast_channel *chan, int duration) {
+
+       struct ast_frame *f;
+       int totalsilence = 0;
+       int dspsilence = 0;
+       int gotsilence = 0; 
+       static int silencethreshold = 64;
+       int rfmt = 0;
+       int res = 0;
+       struct ast_dsp *sildet;  /* silence detector dsp */
+
+       rfmt = chan->readformat; /* Set to linear mode */
+       res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
+       if (res < 0) {
+               ast_log(LOG_WARNING, "Unable to set to linear mode, giving up\n");
+               return -1;
+       }
+
+       sildet = ast_dsp_new(); /* Create the silence detector */
+       if (!sildet) {
+               ast_log(LOG_WARNING, "Unable to create silence detector :(\n");
+               return -1;
+       }
+       ast_dsp_set_threshold(sildet, silencethreshold);
+
+       /* Await silence... */
+       f = NULL;
+       for(;;) {
+               res = ast_waitfor(chan, 2000);
+               if (!res) {
+                       ast_log(LOG_WARNING, "One waitfor failed, trying another\n");
+                       /* Try one more time in case of masq */
+                       res = ast_waitfor(chan, 2000);
+                       if (!res) {
+                               ast_log(LOG_WARNING, "No audio available on %s??\n", chan->name);
+                               res = -1;
+                       }
+               }
+
+               if (res < 0) {
+                       f = NULL;
+                       break;
+               }
+               f = ast_read(chan);
+               if (!f)
+                       break;
+               if (f->frametype == AST_FRAME_VOICE) {
+                       dspsilence = 0;
+                       ast_dsp_silence(sildet, f, &dspsilence);
+                       if (dspsilence)
+                               totalsilence = dspsilence;
+                       else
+                               totalsilence = 0;
+                       /* ast_verbose(VERBOSE_PREFIX_3 "dspsilence: %d, totalsilence: %d\n", dspsilence, totalsilence); */
+
+                       if (totalsilence >= duration) {
+                               ast_verbose(VERBOSE_PREFIX_3 "exiting with %d silence > %d required\n", totalsilence, duration);
+                               /* Ended happily with silence */
+                               ast_frfree(f);
+                               gotsilence = 1;
+                               break;
+                       }
+               }
+               ast_frfree(f);
+       }
+       ast_dsp_free(sildet);
+       return gotsilence;
+}
+
+static int waitforsilence_exec(struct ast_channel *chan, void *data)
+{
+       int res=1;
+       struct localuser *u;
+       int duration = 1000;
+       int iterations = 1, i;
+
+       res = ast_answer(chan); /* Answer the channel */
+
+       if (!data || ((sscanf(data, "%d|%d", &duration, &iterations) != 2) &&
+               (sscanf(data, "%d", &duration != 1)))) {
+               ast_log(LOG_WARNING, "Using default value of 1000ms, 1 iteration\n");
+       }
+
+       ast_verbose(VERBOSE_PREFIX_3 "Waiting %d time(s) for %d ms silence\n", iterations, duration);
+       LOCAL_USER_ADD(u);
+       res = 1;
+       for ( i=0; (i<iterations) && (res == 1); i++) {
+               res = do_waiting(chan, duration);
+       }
+       LOCAL_USER_REMOVE(u);
+       if (res > 0)
+               res = 0;
+       return res;
+}
+
+int unload_module(void)
+{
+       STANDARD_HANGUP_LOCALUSERS;
+       return ast_unregister_application(app);
+}
+
+int load_module(void)
+{
+       return ast_register_application(app, waitforsilence_exec, synopsis, descrip);
+}
+
+char *description(void)
+{
+       return tdesc;
+}
+
+int usecount(void)
+{
+       int res;
+       STANDARD_USECOUNT(res);
+       return res;
+}
+
+char *key()
+{
+       return ASTERISK_GPL_KEY;
+}
+