Merged revisions 285742 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r285742 | qwell | 2010-09-09 15:06:31 -0500 (Thu, 09 Sep 2010) | 9 lines
  
  Transmit silence when reading DTMF in ast_readstring.
  
  Otherwise, you could get issues with DTMF timeouts causing hangups.
  
  (closes issue #17370)
  Reported by: makoto
  Patches: 
        channel-readstring-silence-generator.patch uploaded by makoto (license 38)
........


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.2@285744 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 13 insertions, 1 deletions

diff --git a/main/channel.c b/main/channel.c
index 3a4ba57a3..6536944f0 100644
--- a/main/channel.c
+++ b/main/channel.c
@@ -4304,6 +4304,8 @@ int ast_readstring_full(struct ast_channel *c, char *s, int len, int timeout, in
 	int pos = 0;	/* index in the buffer where we accumulate digits */
 	int to = ftimeout;
 
+	struct ast_silence_generator *silgen = NULL;
+
 	/* Stop if we're a zombie or need a soft hangup */
 	if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
 		return -1;
@@ -4314,24 +4316,33 @@ int ast_readstring_full(struct ast_channel *c, char *s, int len, int timeout, in
 		if (c->stream) {
 			d = ast_waitstream_full(c, AST_DIGIT_ANY, audiofd, ctrlfd);
 			ast_stopstream(c);
+			if (!silgen && ast_opt_transmit_silence)
+				silgen = ast_channel_start_silence_generator(c);
 			usleep(1000);
 			if (!d)
 				d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
 		} else {
+			if (!silgen && ast_opt_transmit_silence)
+				silgen = ast_channel_start_silence_generator(c);
 			d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
 		}
-		if (d < 0)
+		if (d < 0) {
+			ast_channel_stop_silence_generator(c, silgen);
 			return AST_GETDATA_FAILED;
+		}
 		if (d == 0) {
 			s[pos] = '\0';
+			ast_channel_stop_silence_generator(c, silgen);
 			return AST_GETDATA_TIMEOUT;
 		}
 		if (d == 1) {
 			s[pos] = '\0';
+			ast_channel_stop_silence_generator(c, silgen);
 			return AST_GETDATA_INTERRUPTED;
 		}
 		if (strchr(enders, d) && (pos == 0)) {
 			s[pos] = '\0';
+			ast_channel_stop_silence_generator(c, silgen);
 			return AST_GETDATA_EMPTY_END_TERMINATED;
 		}
 		if (!strchr(enders, d)) {
@@ -4339,6 +4350,7 @@ int ast_readstring_full(struct ast_channel *c, char *s, int len, int timeout, in
 		}
 		if (strchr(enders, d) || (pos >= len)) {
 			s[pos] = '\0';
+			ast_channel_stop_silence_generator(c, silgen);
 			return AST_GETDATA_COMPLETE;
 		}
 		to = timeout;