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Improve behavior of ast_answer() to not lose incoming frames

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ast_answer(), when supplied a delay before returning to the caller, use ast_safe_sleep() to implement the delay. Unfortunately during this time any incoming frames are discarded, which is problematic for T.38 re-INVITES and other sorts of channel operations.

When a delay is not passed to ast_answer(), it still delays for up to 500 milliseconds, waiting for media to arrive. Again, though, it discards any control frames, or non-voice media frames.

This patch rectifies this situation, by storing all incoming frames during the delay period on a list, and then requeuing them onto the channel before returning to the caller.

http://reviewboard.digium.com/r/196/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@182525 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2009-03-17 14:38:11 +00:00
parent 9456bd1db5
commit d11b6386a5
3 changed files with 157 additions and 42 deletions
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7
main/features.c
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@@ -2477,8 +2477,11 @@ int ast_bridge_call(struct ast_channel *chan,struct ast_channel *peer,struct ast
config->firstpass = 1;
/* Answer if need be */
if (ast_answer(chan))
return -1;
if (chan->_state != AST_STATE_UP) {
if (ast_raw_answer(chan, 1)) {
return -1;
}
}
ast_copy_string(orig_channame,chan->name,sizeof(orig_channame));
ast_copy_string(orig_peername,peer->name,sizeof(orig_peername));