From d787ccff35565a35bceb0ef316f948588b34a5a0 Mon Sep 17 00:00:00 2001
From: Matthew Nicholson <mnicholson@digium.com>
Date: Fri, 16 Jul 2010 17:30:39 +0000
Subject: [PATCH] Merged revisions 277247 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4
........
r277247 | mnicholson | 2010-07-16 12:29:57 -0500 (Fri, 16 Jul 2010) | 4 lines
For pass through DTMF tones, measure the actual duration between the begin and end packets on the wire. If it is detected to be less than AST_MIN_DTMF_DURATION, trigger dtmf emulation.
AST-362
........
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@277250 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
main/channel.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/main/channel.c b/main/channel.c
index 94d7d26160..a80eeeec04 100644
--- a/main/channel.c
+++ b/main/channel.c
@@ -3849,6 +3849,19 @@ static struct ast_frame *__ast_read(struct ast_channel *chan, int dropaudio)
ast_clear_flag(chan, AST_FLAG_IN_DTMF);
if (!f->len)
f->len = ast_tvdiff_ms(now, chan->dtmf_tv);
+
+ /* detect tones that were received on
+ * the wire with durations shorter than
+ * AST_MIN_DTMF_DURATION and set f->len
+ * to the actual duration of the DTMF
+ * frames on the wire. This will cause
+ * dtmf emulation to be triggered later
+ * on.
+ */
+ if (ast_tvdiff_ms(now, chan->dtmf_tv) < AST_MIN_DTMF_DURATION) {
+ f->len = ast_tvdiff_ms(now, chan->dtmf_tv);
+ ast_log(LOG_DTMF, "DTMF end '%c' detected to have actual duration %ld on the wire, emulation will be triggered on %s\n", f->subclass, f->len, chan->name);
+ }
} else if (!f->len) {
ast_log(LOG_DTMF, "DTMF end accepted without begin '%c' on %s\n", f->subclass.integer, chan->name);
f->len = AST_MIN_DTMF_DURATION;
--
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