add a way to tell mod_conference when the rate of the channel has changed due to a codec change so it can reset the resampler and codecs internally

src/include/switch_types.h

@@ -1013,6 +1013,7 @@ typedef enum {
 	SWITCH_MESSAGE_ANSWER_EVENT,
 	SWITCH_MESSAGE_PROGRESS_EVENT,
 	SWITCH_MESSAGE_RING_EVENT,
+	SWITCH_MESSAGE_RESAMPLE_EVENT,
 	SWITCH_MESSAGE_INVALID
 } switch_core_session_message_types_t;
 
@@ -1407,6 +1408,7 @@ typedef enum {
 	CF_VIDEO_PAUSE,
 	CF_BYPASS_MEDIA_AFTER_HOLD,
 	CF_HANGUP_HELD,
+	CF_CONFERENCE_RESET_MEDIA,
 	/* WARNING: DO NOT ADD ANY FLAGS BELOW THIS LINE */
 	/* IF YOU ADD NEW ONES CHECK IF THEY SHOULD PERSIST OR ZERO THEM IN switch_core_session.c switch_core_session_request_xml() */
 	CF_FLAG_MAX