add silence gen to wait apps

asterisk.conf's 'transmit_silence' option existed before
this patch, but was limited to only generating silence
while recording and sending DTMF.  Now enabling the
transmit_silence option generates silence during wait
times as well.

To achieve this, ast_safe_sleep has been modified to
generate silence anytime no other generators are present
and transmit_silence is enabled.  Wait apps not using
ast_safe_sleep now generate silence when transmit_silence
is enabled as well.

(closes issue #16524)
Reported by: kobaz

(closes issue #16523)
Reported by: kobaz
Tested by: dvossel

Review: https://reviewboard.asterisk.org/r/456/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@239712 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Makefile

@@ -733,7 +733,7 @@ samples: adsi
 		echo ";cache_record_files = yes ; Cache recorded sound files to another directory during recording" ; \
 		echo ";record_cache_dir = /tmp ; Specify cache directory (used in cnjunction with cache_record_files)" ; \
 		echo ";transmit_silence_during_record = yes ; Transmit SLINEAR silence while a channel is being recorded" ; \
-		echo ";transmit_silence = yes ; Transmit SLINEAR silence while a channel is being recorded or DTMF is being generated" ; \
+		echo ";transmit_silence = yes ; Transmit SLINEAR silence while a channel is waiting, being recorded, or DTMF is being generated" ; \
 		echo ";transcode_via_sln = yes ; Build transcode paths via SLINEAR, instead of directly" ; \
 		echo ";runuser = asterisk ; The user to run as" ; \
 		echo ";rungroup = asterisk ; The group to run as" ; \

apps/app_waitforring.c

@@ -56,6 +56,7 @@ static char *app = "WaitForRing";
 static int waitforring_exec(struct ast_channel *chan, const char *data)
 {
 	struct ast_frame *f;
+	struct ast_silence_generator *silgen = NULL;
 	int res = 0;
 	double s;
 	int ms;
@@ -65,6 +66,10 @@ static int waitforring_exec(struct ast_channel *chan, const char *data)
 		return 0;
 	}
 
+	if (ast_opt_transmit_silence) {
+		silgen = ast_channel_start_silence_generator(chan);
+	}
+
 	ms = s * 1000.0;
 	while (ms > 0) {
 		ms = ast_waitfor(chan, ms);
@@ -109,6 +114,10 @@ static int waitforring_exec(struct ast_channel *chan, const char *data)
 		}
 	}
 
+	if (silgen) {
+		ast_channel_stop_silence_generator(chan, silgen);
+	}
+
 	return res;
 }
 

apps/app_waitforsilence.c

@@ -209,6 +209,7 @@ static int waitfor_exec(struct ast_channel *chan, const char *data, int wait_for
 	int timeout = 0;
 	int iterations = 1, i;
 	time_t waitstart;
+	struct ast_silence_generator *silgen = NULL;
 
 	if (chan->_state != AST_STATE_UP) {
 		res = ast_answer(chan); /* Answer the channel */
@@ -222,11 +223,19 @@ static int waitfor_exec(struct ast_channel *chan, const char *data, int wait_for
 
 	ast_verb(3, "Waiting %d time(s) for %d ms silence with %d timeout\n", iterations, timereqd, timeout);
 
+	if (ast_opt_transmit_silence) {
+		silgen = ast_channel_start_silence_generator(chan);
+	}
 	time(&waitstart);
 	res = 1;
 	for (i=0; (i<iterations) && (res == 1); i++) {
 		res = do_waiting(chan, timereqd, waitstart, timeout, wait_for_silence);
 	}
+	if (silgen) {
+		ast_channel_stop_silence_generator(chan, silgen);
+	}
+
+
 	if (res > 0)
 		res = 0;
 	return res;

main/channel.c

@@ -1411,21 +1411,39 @@ struct ast_channel *ast_channel_get_by_exten(const char *exten, const char *cont
 int ast_safe_sleep_conditional(struct ast_channel *chan, int ms, int (*cond)(void*), void *data)
 {
 	struct ast_frame *f;
+	struct ast_silence_generator *silgen = NULL;
+	int res = 0;
+
+	/* If no other generator is present, start silencegen while waiting */
+	if (ast_opt_transmit_silence && !chan->generatordata) {
+		silgen = ast_channel_start_silence_generator(chan);
+	}
 
 	while (ms > 0) {
-		if (cond && ((*cond)(data) == 0))
+		if (cond && ((*cond)(data) == 0)) {
-			return 0;
+			break;
+		}
 		ms = ast_waitfor(chan, ms);
-		if (ms < 0)
+		if (ms < 0) {
-			return -1;
+			res = -1;
+			break;
+		}
 		if (ms > 0) {
 			f = ast_read(chan);
-			if (!f)
+			if (!f) {
-				return -1;
+				res = -1;
+				break;
+			}
 			ast_frfree(f);
 		}
 	}
-	return 0;
+
+	/* stop silgen if present */
+	if (silgen) {
+		ast_channel_stop_silence_generator(chan, silgen);
+	}
+
+	return res;
 }
 
 /*! \brief Wait, look for hangups */