Exit native bridging early for greater timing accuracy with warnings

This changes native bridging to break one millisecond early so that the more
accurate timeval calculations done in the generic bridge can be performed using
the bridge config. Currently the time between exiting native bridging slightly
late can sometimes cause a large enough discrepancy for warnings to be missed.
For the record, 1.4 does not attempt to native bridge at all when warnings are
enabled.

(closes issue #15815)
Reported by: adomjan

Review: https://reviewboard.asterisk.org/r/577/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@254050 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel.c

@@ -6058,14 +6058,17 @@ enum ast_bridge_result ast_channel_bridge(struct ast_channel *c0, struct ast_cha
 		bridge_play_sounds(c0, c1);
 
 		if (c0->tech->bridge &&
+			/* if < 1 ms remains use generic bridging for accurate timing */
+			(!config->timelimit || to > 1000 || to == 0) &&
 		    (c0->tech->bridge == c1->tech->bridge) &&
 		    !c0->monitor && !c1->monitor &&
-		    !c0->audiohooks && !c1->audiohooks && 
+		    !c0->audiohooks && !c1->audiohooks &&
 		    !c0->masq && !c0->masqr && !c1->masq && !c1->masqr) {
+			int timeoutms = to - 1000 > 0 ? to - 1000 : to;
 			/* Looks like they share a bridge method and nothing else is in the way */
 			ast_set_flag(c0, AST_FLAG_NBRIDGE);
 			ast_set_flag(c1, AST_FLAG_NBRIDGE);
-			if ((res = c0->tech->bridge(c0, c1, config->flags, fo, rc, to)) == AST_BRIDGE_COMPLETE) {
+			if ((res = c0->tech->bridge(c0, c1, config->flags, fo, rc, timeoutms)) == AST_BRIDGE_COMPLETE) {
 				ast_manager_event_multichan(EVENT_FLAG_CALL, "Unlink", 2, chans,
 					      "Channel1: %s\r\n"
 					      "Channel2: %s\r\n"