If audio suddenly gets fed into one side of a channel after a lapse of frames flush the other factory so that old audio does not remain in the factory causing the sync code to not execute.

(closes issue #12296)
Reported by: jvandal


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@113296 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 13 insertions, 4 deletions

diff --git a/main/audiohook.c b/main/audiohook.c
index 8fd1501c9..c6f1abec8 100644
--- a/main/audiohook.c
+++ b/main/audiohook.c
@@ -128,14 +128,23 @@ int ast_audiohook_destroy(struct ast_audiohook *audiohook)
 int ast_audiohook_write_frame(struct ast_audiohook *audiohook, enum ast_audiohook_direction direction, struct ast_frame *frame)
 {
 	struct ast_slinfactory *factory = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->read_factory : &audiohook->write_factory);
-	struct timeval *time = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->read_time : &audiohook->write_time);
+	struct ast_slinfactory *other_factory = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->write_factory : &audiohook->read_factory);
+	struct timeval *time = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->read_time : &audiohook->write_time), previous_time = *time;
+
+	/* Update last feeding time to be current */
+	*time = ast_tvnow();
+
+	/* If we are using a sync trigger and this factory suddenly got audio fed in after a lapse, then flush both factories to ensure they remain in sync */
+	if (ast_test_flag(audiohook, AST_AUDIOHOOK_TRIGGER_SYNC) && ast_slinfactory_available(other_factory) && (ast_tvdiff_ms(*time, previous_time) > (ast_slinfactory_available(other_factory) / 8))) {
+		if (option_debug)
+			ast_log(LOG_DEBUG, "Flushing audiohook %p so it remains in sync\n", audiohook);
+		ast_slinfactory_flush(factory);
+		ast_slinfactory_flush(other_factory);
+	}
 
 	/* Write frame out to respective factory */
 	ast_slinfactory_feed(factory, frame);
 
-	/* Update last fed time for the above factory */
-	*time = ast_tvnow();
-
 	/* If we need to notify the respective handler of this audiohook, do so */
 	if ((ast_test_flag(audiohook, AST_AUDIOHOOK_TRIGGER_MODE) == AST_AUDIOHOOK_TRIGGER_READ) && (direction == AST_AUDIOHOOK_DIRECTION_READ)) {
 		ast_cond_signal(&audiohook->trigger);