Merged revisions 279946 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.6.2

................
  r279946 | dvossel | 2010-07-27 15:54:32 -0500 (Tue, 27 Jul 2010) | 24 lines
  
  Merged revisions 279945 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
  ........
    r279945 | dvossel | 2010-07-27 15:33:40 -0500 (Tue, 27 Jul 2010) | 19 lines
    
    remove empty audiohook write list on channel
    
    If a channel has an audiohook write list created on it, that
    list stays on the channel until the channel is destroyed.  There
    is no reason to keep that list on the channel if it becomes empty.
    If it is empty that just means we are doing needless translating
    for every ast_read and ast_write.  This patch removes the audiohook
    list from the channel once it is detected to be empty on either a
    read or write.  If a audiohook is added back to the channel after
    this list is destroyed, the list just gets recreated as if it never
    existed to begin with.
    
    (closes issue #17630)
    Reported by: manvirr
    
    Review: https://reviewboard.asterisk.org/r/799/
  ........
................


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.8@279949 f38db490-d61c-443f-a65b-d21fe96a405b

3 files changed, 28 insertions, 1 deletions

diff --git a/include/asterisk/audiohook.h b/include/asterisk/audiohook.h
index 6d773bf90..abf6ca345 100644
--- a/include/asterisk/audiohook.h
+++ b/include/asterisk/audiohook.h
@@ -202,6 +202,13 @@ int ast_audiohook_detach_source(struct ast_channel *chan, const char *source);
  */
 int ast_audiohook_remove(struct ast_channel *chan, struct ast_audiohook *audiohook);
 
+/*!
+ * \brief determines if a audiohook_list is empty or not.
+ *
+ * retval 0 false, 1 true
+ */
+int ast_audiohook_write_list_empty(struct ast_audiohook_list *audiohook_list);
+
 /*! \brief Pass a frame off to be handled by the audiohook core
  * \param chan Channel that the list is coming off of
  * \param audiohook_list List of audiohooks
diff --git a/main/audiohook.c b/main/audiohook.c
index 031f36e7e..ad977ecbc 100644
--- a/main/audiohook.c
+++ b/main/audiohook.c
@@ -735,6 +735,17 @@ static struct ast_frame *audio_audiohook_write_list(struct ast_channel *chan, st
 	return end_frame;
 }
 
+int ast_audiohook_write_list_empty(struct ast_audiohook_list *audiohook_list)
+{
+	if (AST_LIST_EMPTY(&audiohook_list->spy_list) &&
+		AST_LIST_EMPTY(&audiohook_list->whisper_list) &&
+		AST_LIST_EMPTY(&audiohook_list->manipulate_list)) {
+
+		return 1;
+	}
+	return 0;
+}
+
 /*! \brief Pass a frame off to be handled by the audiohook core
  * \param chan Channel that the list is coming off of
  * \param audiohook_list List of audiohooks
@@ -752,7 +763,6 @@ struct ast_frame *ast_audiohook_write_list(struct ast_channel *chan, struct ast_
 	else
 		return frame;
 }
-			
 
 /*! \brief Wait for audiohook trigger to be triggered
  * \param audiohook Audiohook to wait on
diff --git a/main/channel.c b/main/channel.c
index 00f3f7863..fc7ade985 100644
--- a/main/channel.c
+++ b/main/channel.c
@@ -4064,6 +4064,11 @@ done:
 	if (chan->music_state && chan->generator && chan->generator->digit && f && f->frametype == AST_FRAME_DTMF_END)
 		chan->generator->digit(chan, f->subclass.integer);
 
+	if (chan->audiohooks && ast_audiohook_write_list_empty(chan->audiohooks)) {
+		/* The list gets recreated if audiohooks are added again later */
+		ast_audiohook_detach_list(chan->audiohooks);
+		chan->audiohooks = NULL;
+	}
 	ast_channel_unlock(chan);
 	return f;
 }
@@ -4801,6 +4806,11 @@ int ast_write(struct ast_channel *chan, struct ast_frame *fr)
 		chan->fout = FRAMECOUNT_INC(chan->fout);
 	}
 done:
+	if (chan->audiohooks && ast_audiohook_write_list_empty(chan->audiohooks)) {
+		/* The list gets recreated if audiohooks are added again later */
+		ast_audiohook_detach_list(chan->audiohooks);
+		chan->audiohooks = NULL;
+	}
 	ast_channel_unlock(chan);
 	return res;
 }