In ChanSpy, don't create audiohooks that will never be used.

When ChanSpy is initialized it creates and attaches 3 audiohooks:

  1) Read audio off of the channel that we are spying on
  2) Write audio to the channel that we are spying on
  3) Write audio to the channel that is bridged to the channel that we are
     spying on.

The first is always necessary, but the others are used only when specific
options are passed to the ChanSpy application (B, d, w, and W to be specific).

When those flags are not passed, neither of those audiohooks are ever sent
frames, but we still try to process the hooks for each voice frame that we
recieve on the channel.

So in short - only create and attach audiohooks that we actually need.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@349044 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_chanspy.c

@@ -543,6 +543,9 @@ static int channel_spy(struct ast_channel *chan, struct ast_autochan *spyee_auto
 	memset(&csth, 0, sizeof(csth));
 	ast_copy_flags(&csth.flags, flags, AST_FLAGS_ALL);
 
+	/* This is the audiohook which gives us the audio off the channel we are
+	   spying on.
+	*/
 	ast_audiohook_init(&csth.spy_audiohook, AST_AUDIOHOOK_TYPE_SPY, "ChanSpy");
 
 	if (start_spying(spyee_autochan, spyer_name, &csth.spy_audiohook)) {
@@ -550,11 +553,23 @@ static int channel_spy(struct ast_channel *chan, struct ast_autochan *spyee_auto
 		return 0;
 	}
 
+	if (ast_test_flag(flags, OPTION_WHISPER | OPTION_BARGE | OPTION_DTMF_SWITCH_MODES)) {
+		/* This audiohook will let us inject audio from our channel into the
+		   channel we are currently spying on.
+		*/
 		ast_audiohook_init(&csth.whisper_audiohook, AST_AUDIOHOOK_TYPE_WHISPER, "ChanSpy");
-	ast_audiohook_init(&csth.bridge_whisper_audiohook, AST_AUDIOHOOK_TYPE_WHISPER, "Chanspy");
+
 		if (start_spying(spyee_autochan, spyer_name, &csth.whisper_audiohook)) {
 			ast_log(LOG_WARNING, "Unable to attach whisper audiohook to spyee %s. Whisper mode disabled!\n", name);
 		}
+	}
+
+	if (ast_test_flag(flags, OPTION_BARGE | OPTION_DTMF_SWITCH_MODES)) {
+		/* And this hook lets us inject audio into the channel that the spied on
+		   channel is currently bridged with.
+		*/
+		ast_audiohook_init(&csth.bridge_whisper_audiohook, AST_AUDIOHOOK_TYPE_WHISPER, "Chanspy");
+
 		if ((spyee_bridge_autochan = ast_autochan_setup(ast_bridged_channel(spyee_autochan->chan)))) {
 			ast_channel_lock(spyee_bridge_autochan->chan);
 			if (start_spying(spyee_bridge_autochan, spyer_name, &csth.bridge_whisper_audiohook)) {
@@ -562,6 +577,7 @@ static int channel_spy(struct ast_channel *chan, struct ast_autochan *spyee_auto
 			}
 			ast_channel_unlock(spyee_bridge_autochan->chan);
 		}
+	}
 
 	ast_channel_lock(chan);
 	ast_set_flag(chan, AST_FLAG_END_DTMF_ONLY);
@@ -683,15 +699,19 @@ static int channel_spy(struct ast_channel *chan, struct ast_autochan *spyee_auto
 	ast_clear_flag(chan, AST_FLAG_END_DTMF_ONLY);
 	ast_channel_unlock(chan);
 
+	if (ast_test_flag(flags, OPTION_WHISPER | OPTION_BARGE | OPTION_DTMF_SWITCH_MODES)) {
 		ast_audiohook_lock(&csth.whisper_audiohook);
 		ast_audiohook_detach(&csth.whisper_audiohook);
 		ast_audiohook_unlock(&csth.whisper_audiohook);
 		ast_audiohook_destroy(&csth.whisper_audiohook);
+	}
 
+	if (ast_test_flag(flags, OPTION_BARGE | OPTION_DTMF_SWITCH_MODES)) {
 		ast_audiohook_lock(&csth.bridge_whisper_audiohook);
 		ast_audiohook_detach(&csth.bridge_whisper_audiohook);
 		ast_audiohook_unlock(&csth.bridge_whisper_audiohook);
 		ast_audiohook_destroy(&csth.bridge_whisper_audiohook);
+	}
 
 	ast_audiohook_lock(&csth.spy_audiohook);
 	ast_audiohook_detach(&csth.spy_audiohook);