[Asterisk-code-review] codec_builtin.c: G729 audio gets corrupted by Asterisk due to smoother (asterisk[19])

[George Joseph]

George Joseph has uploaded this change for review. ( https://gerrit.asterisk.org/c/asterisk/+/16242 )


Change subject: codec_builtin.c: G729 audio gets corrupted by Asterisk due to smoother
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codec_builtin.c: G729 audio gets corrupted by Asterisk due to smoother

If Asterisk gets G.729 6-byte VAD frames inbound, then at outbound Asterisk sends this G.729 stream with non-continuous timestamps.
This makes the audio stream not-playable at the receiver side.
Linphone isn't able to play such an audio - lots of disruptions are heard.
Also I had complains of bad audio from users which use other types of phones.

After debugging, I found this is a regression connected with RTP Smoother (main/smoother.c).

Smoother has a special code to handle G.729 VAD frames (search for AST_SMOOTHER_FLAG_G729 in smoother.c).

However, this flag is never set in Asterisk-12 and newer.
Previously it has been set (see Asterisk-11).

ASTERISK-29526 #close

Change-Id: I6f51ecb1a3ecd9c6d59ec5a6811a27446e17065d
---
M main/codec_builtin.c
1 file changed, 1 insertion(+), 0 deletions(-)



  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/42/16242/1

diff --git a/main/codec_builtin.c b/main/codec_builtin.c
index c1ae685..bd69d46 100644
--- a/main/codec_builtin.c
+++ b/main/codec_builtin.c
@@ -457,6 +457,7 @@
 	.samples_count = g729_samples,
 	.get_length = g729_length,
 	.smooth = 1,
+	.smoother_flags = AST_SMOOTHER_FLAG_G729,
 };
 
 static unsigned char get_n_bits_at(unsigned char *data, int n, int bit)

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Gerrit-Project: asterisk
Gerrit-Branch: 19
Gerrit-Change-Id: I6f51ecb1a3ecd9c6d59ec5a6811a27446e17065d
Gerrit-Change-Number: 16242
Gerrit-PatchSet: 1
Gerrit-Owner: George Joseph <gjoseph at digium.com>
Gerrit-CC: under <pcapdump at gmail.com>
Gerrit-MessageType: newchange
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