/*
 * Copyright 2008-2014 Arsen Chaloyan
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * $Id: mrcp_client_session.c 2251 2014-11-21 02:36:44Z achaloyan@gmail.com $
 */

#include "mrcp_client_session.h"
#include "mrcp_resource_factory.h"
#include "mrcp_resource.h"
#include "mrcp_sig_agent.h"
#include "mrcp_client_connection.h"
#include "mrcp_session.h"
#include "mrcp_session_descriptor.h"
#include "mrcp_control_descriptor.h"
#include "mrcp_message.h"
#include "mrcp_ca_factory.h"
#include "mpf_engine_factory.h"
#include "mpf_termination_factory.h"
#include "mpf_stream.h"
#include "apt_consumer_task.h"
#include "apt_obj_list.h"
#include "apt_log.h"

/** Macro to log session name and identifier */
#define MRCP_SESSION_NAMESID(session) \
	session->base.name, MRCP_SESSION_SID(&session->base)

#define IS_SESSION_TERMINATE(app_message) \
	(app_message->message_type == MRCP_APP_MESSAGE_TYPE_SIGNALING && \
	app_message->sig_message.command_id == MRCP_SIG_COMMAND_SESSION_TERMINATE)

void mrcp_client_session_add(mrcp_client_t *client, mrcp_client_session_t *session);
void mrcp_client_session_remove(mrcp_client_t *client, mrcp_client_session_t *session);

static apt_bool_t mrcp_client_session_offer_send(mrcp_client_session_t *session);

static apt_bool_t mrcp_app_session_terminate_raise(mrcp_client_session_t *session, mrcp_sig_status_code_e status);
static apt_bool_t mrcp_app_sig_response_raise(mrcp_client_session_t *session, apt_bool_t process_pending_requests);
static apt_bool_t mrcp_app_sig_event_raise(mrcp_client_session_t *session, mrcp_channel_t *channel);
static apt_bool_t mrcp_app_control_message_raise(mrcp_client_session_t *session, mrcp_channel_t *channel, mrcp_message_t *mrcp_message);
static apt_bool_t mrcp_app_failure_message_raise(mrcp_client_session_t *session);
static apt_bool_t mrcp_app_request_dispatch(mrcp_client_session_t *session, const mrcp_app_message_t *app_message);

static apt_bool_t mrcp_client_resource_answer_process(mrcp_client_session_t *session, mrcp_session_descriptor_t *descriptor);
static apt_bool_t mrcp_client_control_media_answer_process(mrcp_client_session_t *session, mrcp_session_descriptor_t *descriptor);
static apt_bool_t mrcp_client_av_media_answer_process(mrcp_client_session_t *session, mrcp_session_descriptor_t *descriptor);

static mrcp_channel_t* mrcp_client_channel_find_by_name(mrcp_client_session_t *session, const apt_str_t *resource_name);

static APR_INLINE mrcp_version_e mrcp_session_version_get(mrcp_client_session_t *session)
{
	return session->profile->mrcp_version;
}

static APR_INLINE void mrcp_client_session_state_set(mrcp_client_session_t *session, mrcp_client_session_state_e state)
{
	if(session->subrequest_count != 0) {
		/* error case */
		apt_obj_log(APT_LOG_MARK,APT_PRIO_ERROR,session->base.log_obj,"Unexpected State Change [%d] pending subrequests [%d] "APT_NAMESID_FMT,
			state,
			session->subrequest_count,
			MRCP_SESSION_NAMESID(session));
		session->subrequest_count = 0;
	}
	session->state = state;
}

static APR_INLINE void mrcp_client_session_subrequest_add(mrcp_client_session_t *session)
{
	session->subrequest_count++;
}

static APR_INLINE apt_bool_t mrcp_client_session_subrequest_remove(mrcp_client_session_t *session)
{
	if(!session->subrequest_count) {
		/* error case */
		return FALSE;
	}

	session->subrequest_count--;
	return (session->subrequest_count ? FALSE : TRUE);
}

static mrcp_app_message_t* mrcp_client_app_response_create(const mrcp_app_message_t *app_request, mrcp_sig_status_code_e status, apr_pool_t *pool)
{
	mrcp_app_message_t *app_response = apr_palloc(pool,sizeof(mrcp_app_message_t));
	*app_response = *app_request;
	app_response->sig_message.message_type = MRCP_SIG_MESSAGE_TYPE_RESPONSE;
	app_response->sig_message.status = status;
	return app_response;
}


mrcp_channel_t* mrcp_client_channel_create(
					mrcp_client_session_t *session,
					mrcp_resource_t *resource,
					mpf_termination_t *termination,
					mpf_rtp_termination_descriptor_t *rtp_descriptor,
					void *obj)
{
	mrcp_channel_t *channel = apr_palloc(session->base.pool,sizeof(mrcp_channel_t));
	channel->pool = session->base.pool;
	channel->obj = obj;
	channel->session = &session->base;
	channel->control_channel = NULL;
	channel->termination = termination;
	channel->rtp_termination_slot = NULL;
	channel->resource = resource;
	channel->waiting_for_channel = FALSE;
	channel->waiting_for_termination = FALSE;

	if(rtp_descriptor) {
		rtp_termination_slot_t *termination_slot = apr_palloc(channel->pool,sizeof(rtp_termination_slot_t));
		termination_slot->descriptor = rtp_descriptor;
		termination_slot->termination = NULL;
		termination_slot->waiting = FALSE;
		termination_slot->channel = channel;
		termination_slot->id = 0;
		channel->rtp_termination_slot = termination_slot;
	}
	apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Create Channel "APT_NAMESID_FMT,
		MRCP_SESSION_NAMESID(session));
	return channel;
}

apt_bool_t mrcp_client_session_answer_process(mrcp_client_session_t *session, mrcp_session_descriptor_t *descriptor)
{
	if(!session->offer) {
		return FALSE;
	}
	if(!descriptor) {
		apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Receive Answer "APT_NAMESID_FMT" [null descriptor]",
			MRCP_SESSION_NAMESID(session));
		session->status = MRCP_SIG_STATUS_CODE_FAILURE;
		/* raise app response */
		return mrcp_app_sig_response_raise(session,TRUE);
	}

	apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Receive Answer "APT_NAMESID_FMT" [c:%d a:%d v:%d] Status %d",
		MRCP_SESSION_NAMESID(session),
		descriptor->control_media_arr->nelts,
		descriptor->audio_media_arr->nelts,
		descriptor->video_media_arr->nelts,
		descriptor->response_code);

	if(descriptor->response_code >=200 && descriptor->response_code < 300) {
		mrcp_client_session_state_set(session,SESSION_STATE_PROCESSING_ANSWER);
		if(session->context) {
			/* first, reset/destroy existing associations and topology */
			if(mpf_engine_topology_message_add(
						session->base.media_engine,
						MPF_RESET_ASSOCIATIONS,session->context,
						&session->mpf_task_msg) == TRUE){
				mrcp_client_session_subrequest_add(session);
			}
		}

		if(mrcp_session_version_get(session) == MRCP_VERSION_1) {
			if(mrcp_client_resource_answer_process(session,descriptor) != TRUE) {
				session->status = MRCP_SIG_STATUS_CODE_FAILURE;
			}
		}
		else {
			mrcp_client_control_media_answer_process(session,descriptor);
			mrcp_client_av_media_answer_process(session,descriptor);
		}

		if(session->context) {
			/* apply topology based on assigned associations */
			if(mpf_engine_topology_message_add(
						session->base.media_engine,
						MPF_APPLY_TOPOLOGY,session->context,
						&session->mpf_task_msg) == TRUE) {
				mrcp_client_session_subrequest_add(session);
			}

			mpf_engine_message_send(session->base.media_engine,&session->mpf_task_msg);
		}
	}
	else {
		session->status = MRCP_SIG_STATUS_CODE_TERMINATE;
	}

	/* store received answer */
	session->answer = descriptor;

	if(!session->subrequest_count) {
		/* raise app response */
		mrcp_app_sig_response_raise(session,TRUE);
	}

	return TRUE;
}

apt_bool_t mrcp_client_session_terminate_response_process(mrcp_client_session_t *session)
{
	apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Session Terminated "APT_NAMESID_FMT, MRCP_SESSION_NAMESID(session));

	if(mrcp_client_session_subrequest_remove(session) == TRUE) {
		mrcp_app_session_terminate_raise(session,MRCP_SIG_STATUS_CODE_SUCCESS);
	}
	return TRUE;
}

apt_bool_t mrcp_client_session_terminate_event_process(mrcp_client_session_t *session)
{
	if(session->state == SESSION_STATE_TERMINATING) {
		/* session termination request has been sent, still waiting for the response,
		   all the events must be ignored at this stage */
		apt_obj_log(APT_LOG_MARK,APT_PRIO_WARNING,session->base.log_obj,"Unexpected Event! "APT_NAMESID_FMT, 
			MRCP_SESSION_NAMESID(session));
		return FALSE;
	}

	apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Mark Session as Disconnected "APT_NAMESID_FMT,
		MRCP_SESSION_NAMESID(session));
	session->disconnected = TRUE;
	if(!session->active_request) {
		/* raise app event */
		mrcp_app_sig_event_raise(session,NULL);
	}

	return TRUE;
}

apt_bool_t mrcp_client_session_control_response_process(mrcp_client_session_t *session, mrcp_message_t *message)
{
	mrcp_channel_t *channel = mrcp_client_channel_find_by_name(session,&message->channel_id.resource_name);
	if(!channel) {
		return FALSE;
	}
	return mrcp_app_control_message_raise(session,channel,message);
}

apt_bool_t mrcp_client_session_discover_response_process(mrcp_client_session_t *session, mrcp_session_descriptor_t *descriptor)
{
	apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Resources Discovered %s", session->base.name);
	if(!session->active_request) {
		return FALSE;
	}

	if(!descriptor) {
		/* raise app response */
		session->status = MRCP_SIG_STATUS_CODE_FAILURE;
		return mrcp_app_sig_response_raise(session,TRUE);
	}

	if(mrcp_session_version_get(session) == MRCP_VERSION_1) {
		if(descriptor->resource_state == TRUE) {
			mrcp_control_descriptor_t *control_media;
			if(!session->answer) {
				session->answer = descriptor;
			}
			control_media = mrcp_control_descriptor_create(session->base.pool);
			control_media->id = mrcp_session_control_media_add(session->answer,control_media);
			control_media->resource_name = descriptor->resource_name;
		}
	}
	else {
		session->answer = descriptor;
	}

	if(mrcp_client_session_subrequest_remove(session) == TRUE) {
		mrcp_app_message_t *response;
		response = mrcp_client_app_response_create(session->active_request,MRCP_SIG_STATUS_CODE_SUCCESS,session->base.pool);
		response->descriptor = session->answer;
		session->answer = NULL;
		apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Raise App Resource Discovery Response %s", session->base.name);
		session->application->handler(response);

		session->active_request = apt_list_pop_front(session->request_queue);
		if(session->active_request) {
			mrcp_app_request_dispatch(session,session->active_request);
		}
	}
	return TRUE;
}

apt_bool_t mrcp_client_on_channel_add(mrcp_channel_t *channel, mrcp_control_descriptor_t *descriptor, apt_bool_t status)
{
	mrcp_client_session_t *session = (mrcp_client_session_t*)channel->session;
	apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Control Channel Added "APT_NAMESIDRES_FMT,
					MRCP_SESSION_NAMESID(session),
					channel->resource->name.buf);
	if(!channel->waiting_for_channel) {
		return FALSE;
	}
	channel->waiting_for_channel = FALSE;
	if(mrcp_client_session_subrequest_remove(session) == TRUE) {
		/* send offer to server */
		mrcp_client_session_offer_send(session);
	}
	return TRUE;
}

apt_bool_t mrcp_client_on_channel_modify(mrcp_channel_t *channel, mrcp_control_descriptor_t *descriptor, apt_bool_t status)
{
	mrcp_client_session_t *session = (mrcp_client_session_t*)channel->session;
	apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Control Channel Modified "APT_NAMESIDRES_FMT,
					MRCP_SESSION_NAMESID(session),
					channel->resource->name.buf);
	if(!channel->waiting_for_channel) {
		return FALSE;
	}
	channel->waiting_for_channel = FALSE;
	if(mrcp_client_session_subrequest_remove(session) == TRUE) {
		/* raise app response */
		if(status != TRUE) {
			session->status = MRCP_SIG_STATUS_CODE_FAILURE;
		}
		mrcp_app_sig_response_raise(session,TRUE);
	}
	return TRUE;
}

apt_bool_t mrcp_client_on_channel_remove(mrcp_channel_t *channel, apt_bool_t status)
{
	mrcp_client_session_t *session = (mrcp_client_session_t*)channel->session;
	apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Control Channel Removed "APT_NAMESIDRES_FMT,
					MRCP_SESSION_NAMESID(session),
					channel->resource->name.buf);
	if(!channel->waiting_for_channel) {
		return FALSE;
	}
	channel->waiting_for_channel = FALSE;
	if(mrcp_client_session_subrequest_remove(session) == TRUE) {
			mrcp_app_session_terminate_raise(
				session,
				status == TRUE ? MRCP_SIG_STATUS_CODE_SUCCESS : MRCP_SIG_STATUS_CODE_FAILURE);
	}
	return TRUE;
}

apt_bool_t mrcp_client_on_message_receive(mrcp_channel_t *channel, mrcp_message_t *message)
{
	mrcp_client_session_t *session = (mrcp_client_session_t*)channel->session;
	return mrcp_app_control_message_raise(session,channel,message);
}

apt_bool_t mrcp_client_on_disconnect(mrcp_channel_t *channel)
{
	mrcp_client_session_t *session = (mrcp_client_session_t*)channel->session;
	return mrcp_client_session_terminate_event_process(session);
}

mrcp_app_message_t* mrcp_client_app_signaling_request_create(mrcp_sig_command_e command_id, apr_pool_t *pool)
{
	mrcp_app_message_t *app_message = apr_palloc(pool,sizeof(mrcp_app_message_t));
	app_message->message_type = MRCP_APP_MESSAGE_TYPE_SIGNALING;
	app_message->sig_message.message_type = MRCP_SIG_MESSAGE_TYPE_REQUEST;
	app_message->sig_message.command_id = command_id;
	return app_message;
}

mrcp_app_message_t* mrcp_client_app_signaling_event_create(mrcp_sig_event_e event_id, apr_pool_t *pool)
{
	mrcp_app_message_t *app_message = apr_palloc(pool,sizeof(mrcp_app_message_t));
	app_message->message_type = MRCP_APP_MESSAGE_TYPE_SIGNALING;
	app_message->sig_message.message_type = MRCP_SIG_MESSAGE_TYPE_EVENT;
	app_message->sig_message.event_id = event_id;
	return app_message;
}

mrcp_app_message_t* mrcp_client_app_control_message_create(apr_pool_t *pool)
{
	mrcp_app_message_t *app_message = apr_palloc(pool,sizeof(mrcp_app_message_t));
	app_message->message_type = MRCP_APP_MESSAGE_TYPE_CONTROL;
	return app_message;
}

apt_bool_t mrcp_client_app_message_process(mrcp_app_message_t *app_message)
{
	mrcp_client_session_t *session = (mrcp_client_session_t*)app_message->session;
	if(app_message->message_type == MRCP_APP_MESSAGE_TYPE_SIGNALING) {
		apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Receive App Request "APT_NAMESID_FMT" [%d]",
			MRCP_SESSION_NAMESID(session),
			app_message->sig_message.command_id);
	}
	else {
		apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Receive App MRCP Request "APT_NAMESID_FMT, 
			MRCP_SESSION_NAMESID(session));
	}

	if(session->active_request) {
		apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Push Request to Queue "APT_NAMESID_FMT, 
			MRCP_SESSION_NAMESID(session));
		apt_list_push_back(session->request_queue,app_message,session->base.pool);
		return TRUE;
	}

	session->active_request = app_message;
	mrcp_app_request_dispatch(session,app_message);
	return TRUE;
}

static apt_bool_t mrcp_client_session_offer_send(mrcp_client_session_t *session)
{
	mrcp_session_descriptor_t *descriptor = session->offer;
	apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Send Offer "APT_NAMESID_FMT" [c:%d a:%d v:%d] to %s:%hu",
		MRCP_SESSION_NAMESID(session),
		descriptor->control_media_arr->nelts,
		descriptor->audio_media_arr->nelts,
		descriptor->video_media_arr->nelts,
		session->profile->signaling_settings->server_ip,
		session->profile->signaling_settings->server_port);
	return mrcp_session_offer(&session->base,descriptor);
}

static apt_bool_t mrcp_app_session_terminate_raise(mrcp_client_session_t *session, mrcp_sig_status_code_e status)
{
	int i;
	mrcp_channel_t *channel;
	for(i=0; i<session->channels->nelts; i++) {
		channel = APR_ARRAY_IDX(session->channels,i,mrcp_channel_t*);
		if(!channel) continue;

		if(channel->control_channel) {
			mrcp_client_control_channel_destroy(channel->control_channel);
			channel->control_channel = NULL;
		}
	}

	mrcp_client_session_remove(session->application->client,session);
	/* raise app response */
	if(status != MRCP_SIG_STATUS_CODE_SUCCESS) {
		session->status = status;
	}
	return mrcp_app_sig_response_raise(session,FALSE);
}

static apt_bool_t mrcp_app_sig_response_raise(mrcp_client_session_t *session, apt_bool_t process_pending_requests)
{
	mrcp_app_message_t *response;
	const mrcp_app_message_t *request = session->active_request;
	if(!request) {
		return FALSE;
	}
	session->active_request = NULL;
	if(session->disconnected == TRUE) {
		session->status = MRCP_SIG_STATUS_CODE_TERMINATE;
	}
	response = mrcp_client_app_response_create(request,session->status,session->base.pool);
	apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Raise App Response "APT_NAMESID_FMT" [%d] %s [%d]", 
		MRCP_SESSION_NAMESID(session),
		response->sig_message.command_id,
		session->status == MRCP_SIG_STATUS_CODE_SUCCESS ? "SUCCESS" : "FAILURE",
		session->status);
	session->application->handler(response);

	if(process_pending_requests) {
		session->active_request = apt_list_pop_front(session->request_queue);
		if(session->active_request) {
			mrcp_app_request_dispatch(session,session->active_request);
		}
	}
	return TRUE;
}

static apt_bool_t mrcp_app_sig_event_raise(mrcp_client_session_t *session, mrcp_channel_t *channel)
{
	mrcp_app_message_t *app_event;
	if(!session) {
		return FALSE;
	}
	app_event = mrcp_client_app_signaling_event_create(MRCP_SIG_EVENT_TERMINATE,session->base.pool);
	app_event->application = session->application;
	app_event->session = &session->base;
	app_event->channel = channel;
	apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Raise App Event "APT_NAMESID_FMT" [%d]", 
		MRCP_SESSION_NAMESID(session),
		app_event->sig_message.event_id);
	return session->application->handler(app_event);
}

static apt_bool_t mrcp_app_control_message_raise(mrcp_client_session_t *session, mrcp_channel_t *channel, mrcp_message_t *mrcp_message)
{
	if(mrcp_message->start_line.message_type == MRCP_MESSAGE_TYPE_RESPONSE) {
		mrcp_app_message_t *response;
		mrcp_message_t *mrcp_request;
		if(!session->active_request || !session->active_request->control_message) {
			return FALSE;
		}
		response = mrcp_client_app_response_create(session->active_request,0,session->base.pool);
		mrcp_request = session->active_request->control_message;
		mrcp_message->start_line.method_id = mrcp_request->start_line.method_id;
		mrcp_message->start_line.method_name = mrcp_request->start_line.method_name;
		response->control_message = mrcp_message;
		apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Raise App MRCP Response "APT_NAMESID_FMT, 
			MRCP_SESSION_NAMESID(session));
		session->application->handler(response);

		session->active_request = apt_list_pop_front(session->request_queue);
		if(session->active_request) {
			mrcp_app_request_dispatch(session,session->active_request);
		}
	}
	else if(mrcp_message->start_line.message_type == MRCP_MESSAGE_TYPE_EVENT) {
		mrcp_app_message_t *app_message;
		app_message = mrcp_client_app_control_message_create(session->base.pool);
		app_message->control_message = mrcp_message;
		app_message->application = session->application;
		app_message->session = &session->base;
		app_message->channel = channel;
		apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Raise App MRCP Event "APT_NAMESID_FMT, 
			MRCP_SESSION_NAMESID(session));
		session->application->handler(app_message);
	}
	return TRUE;
}

static apt_bool_t mrcp_app_failure_message_raise(mrcp_client_session_t *session)
{
	mrcp_app_message_t *response;
	const mrcp_app_message_t *request = session->active_request;
	if(!request) {
		return FALSE;
	}
	session->active_request = NULL;
	response = mrcp_client_app_response_create(request,session->status,session->base.pool);
	if(response->message_type == MRCP_APP_MESSAGE_TYPE_SIGNALING) {
		apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Raise App Response "APT_NAMESID_FMT" [%d] %s [%d]",
			MRCP_SESSION_NAMESID(session),
			response->sig_message.command_id,
			session->status == MRCP_SIG_STATUS_CODE_SUCCESS ? "SUCCESS" : "FAILURE",
			session->status);
	}
	else if(response->control_message){
		mrcp_message_t *mrcp_response = mrcp_response_create(response->control_message,response->control_message->pool);
		mrcp_response->start_line.status_code = MRCP_STATUS_CODE_METHOD_FAILED;
		response->control_message = mrcp_response;
		apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Raise App MRCP Response "APT_NAMESID_FMT, 
			MRCP_SESSION_NAMESID(session));
	}
	session->application->handler(response);
	return TRUE;
}

static apt_bool_t mrcp_client_channel_find(mrcp_client_session_t *session, mrcp_channel_t *channel, int *index)
{
	int i;
	mrcp_channel_t *existing_channel;
	for(i=0; i<session->channels->nelts; i++) {
		existing_channel = APR_ARRAY_IDX(session->channels,i,mrcp_channel_t*);
		if(existing_channel == channel) {
			if(index) {
				*index = i;
			}
			return TRUE;
		}
	}
	return FALSE;
}

static rtp_termination_slot_t* mrcp_client_rtp_termination_find(mrcp_client_session_t *session, mpf_termination_t *termination)
{
	int i;
	rtp_termination_slot_t *slot;
	for(i=0; i<session->terminations->nelts; i++) {
		slot = &APR_ARRAY_IDX(session->terminations,i,rtp_termination_slot_t);
		if(slot->termination == termination) {
			return slot;
		}
	}
	return NULL;
}

static mrcp_channel_t* mrcp_client_channel_termination_find(mrcp_client_session_t *session, mpf_termination_t *termination)
{
	int i;
	mrcp_channel_t *channel;
	for(i=0; i<session->channels->nelts; i++) {
		channel = APR_ARRAY_IDX(session->channels,i,mrcp_channel_t*);
		if(!channel) continue;

		if(channel->termination == termination) {
			return channel;
		}
	}
	return NULL;
}

static mrcp_channel_t* mrcp_client_channel_find_by_name(mrcp_client_session_t *session, const apt_str_t *resource_name)
{
	int i;
	mrcp_channel_t *channel;
	for(i=0; i<session->channels->nelts; i++) {
		channel = APR_ARRAY_IDX(session->channels,i,mrcp_channel_t*);
		if(!channel || !channel->resource) continue;

		if(apt_string_compare(&channel->resource->name,resource_name) == TRUE) {
			return channel;
		}
	}
	return NULL;
}

static apt_bool_t mrcp_client_message_send(mrcp_client_session_t *session, mrcp_channel_t *channel, mrcp_message_t *message)
{
	if(!session->base.id.length) {
		mrcp_message_t *response = mrcp_response_create(message,message->pool);
		response->start_line.status_code = MRCP_STATUS_CODE_METHOD_FAILED;
		apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Raise App Failure MRCP Response "APT_NAMESID_FMT, 
			MRCP_SESSION_NAMESID(session));
		mrcp_app_control_message_raise(session,channel,response);
		return TRUE;
	}

	message->channel_id.session_id = session->base.id;
	message->start_line.request_id = ++session->base.last_request_id;
	apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Send MRCP Request "APT_NAMESIDRES_FMT" [%"MRCP_REQUEST_ID_FMT"]",
					MRCP_SESSION_NAMESID(session),
					channel->resource->name.buf,
					message->start_line.request_id);

	if(channel->control_channel) {
		/* MRCPv2 */
		mrcp_client_control_message_send(channel->control_channel,message);
	}
	else {
		/* MRCPv1 */
		mrcp_session_control_request(channel->session,message);
	}

	return TRUE;
}

static apt_bool_t mrcp_client_channel_modify(mrcp_client_session_t *session, mrcp_channel_t *channel, apt_bool_t enable)
{
	int index;
	if(!session->offer) {
		return FALSE;
	}
	if(!channel->resource) {
		return FALSE;
	}

	apt_obj_log(APT_LOG_MARK,APT_PRIO_NOTICE,session->base.log_obj,"Modify Control Channel "APT_NAMESIDRES_FMT" [%d]",
					MRCP_SESSION_NAMESID(session),
					channel->resource->name.buf,
					enable);
	if(mrcp_client_channel_find(session,channel,&index) == TRUE) {
		mrcp_control_descriptor_t *control_media = mrcp_session_control_media_get(session->offer,(apr_size_t)index);
		if(control_media) {
			control_media->port = (enable == TRUE) ? TCP_DISCARD_PORT : 0;
		}
		if(channel->termination && channel->rtp_termination_slot) {
			mpf_audio_stream_t *audio_stream = mpf_termination_audio_stream_get(
														channel->termination);
			mpf_rtp_media_descriptor_t *audio_media = mrcp_session_audio_media_get(
														session->offer,
														channel->rtp_termination_slot->id);
			if(audio_media && audio_stream) {
				mpf_stream_direction_e direction = mpf_stream_reverse_direction_get(audio_stream->direction);
				if(enable == TRUE) {
					audio_media->direction |= direction;
				}
				else {
					audio_media->direction &= ~direction;
				}
				audio_media->state = (audio_media->direction != STREAM_DIRECTION_NONE) ? MPF_MEDIA_ENABLED : MPF_MEDIA_DISABLED;
			}
		}
	}

	session->offer->resource_name = channel->resource->name;
	session->offer->resource_state = enable;
	return mrcp_client_session_offer_send(session);
}

static apt_bool_t mrcp_client_channel_add(mrcp_client_session_t *session, mrcp_channel_t *channel)
{
	mpf_rtp_termination_descriptor_t *rtp_descriptor = NULL;
	rtp_termination_slot_t *slot;
	apr_pool_t *pool = session->base.pool;
	mrcp_client_profile_t *profile = session->profile;
	if(mrcp_client_channel_find(session,channel,NULL) == TRUE) {
		/* update */
		return mrcp_client_channel_modify(session,channel,TRUE);
	}

	if(!session->offer) {
		session->offer = mrcp_session_descriptor_create(pool);
	}
	
	mrcp_client_session_state_set(session,SESSION_STATE_GENERATING_OFFER);

	if(mrcp_session_version_get(session) == MRCP_VERSION_1) {
		session->offer->resource_name = channel->resource->name;
		session->offer->resource_state = TRUE;
	}
	else {
		mrcp_control_descriptor_t *control_media;
		if(!channel->control_channel) {
			channel->control_channel = mrcp_client_control_channel_create(session->base.connection_agent,channel,pool);
			mrcp_client_control_channel_log_obj_set(channel->control_channel,session->base.log_obj);
		}
		control_media = mrcp_control_offer_create(pool);
		control_media->id = mrcp_session_control_media_add(session->offer,control_media);
		mrcp_cmid_add(control_media->cmid_arr,session->offer->control_media_arr->nelts);
		control_media->resource_name = channel->resource->name;
		if(mrcp_client_control_channel_add(channel->control_channel,control_media) == TRUE) {
			channel->waiting_for_channel = TRUE;
			mrcp_client_session_subrequest_add(session);
		}
	}

	apt_obj_log(APT_LOG_MARK,APT_PRIO_NOTICE,session->base.log_obj,"Add Control Channel "APT_NAMESIDRES_FMT,
					MRCP_SESSION_NAMESID(session),
					channel->resource->name.buf);
	/* add control channel */
	APR_ARRAY_PUSH(session->channels,mrcp_channel_t*) = channel;

	/* add rtp termination slot */
	slot = apr_array_push(session->terminations);
	slot->waiting = FALSE;
	slot->termination = NULL;
	slot->descriptor = NULL;
	slot->channel = channel;
	slot->id = 0;

	if(channel->termination) {
		/* media termination mode */
		mpf_termination_t *termination;
		mpf_audio_stream_t *audio_stream;

		if(!session->context) {
			/* create media context first */
			session->context = mpf_engine_context_create(
				session->base.media_engine,
				session->base.name,
				session,5,pool);
		}
		apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Add Media Termination "APT_NAMESIDRES_FMT,
			MRCP_SESSION_NAMESID(session),
			mpf_termination_name_get(channel->termination));
		if(mpf_engine_termination_message_add(
				session->base.media_engine,
				MPF_ADD_TERMINATION,session->context,channel->termination,NULL,
				&session->mpf_task_msg) == TRUE) {
			channel->waiting_for_termination = TRUE;
			mrcp_client_session_subrequest_add(session);
		}

		/* initialize rtp descriptor */
		rtp_descriptor = apr_palloc(pool,sizeof(mpf_rtp_termination_descriptor_t));
		mpf_rtp_termination_descriptor_init(rtp_descriptor);
		rtp_descriptor->audio.settings = profile->rtp_settings;
		audio_stream = mpf_termination_audio_stream_get(channel->termination);
		if(audio_stream) {
			mpf_rtp_media_descriptor_t *media;
			media = apr_palloc(pool,sizeof(mpf_rtp_media_descriptor_t));
			mpf_rtp_media_descriptor_init(media);
			media->state = MPF_MEDIA_ENABLED;
			media->direction = mpf_stream_reverse_direction_get(audio_stream->direction);
			rtp_descriptor->audio.local = media;
			if(audio_stream->capabilities) {
				rtp_descriptor->audio.capabilities = mpf_stream_capabilities_clone(audio_stream->capabilities,pool);
				rtp_descriptor->audio.capabilities->direction = media->direction;
			}
		}

		/* create rtp termination */
		termination = mpf_termination_create(session->base.rtp_factory,session,pool);
		slot->termination = termination;
		apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Add Media Termination "APT_NAMESIDRES_FMT, 
			MRCP_SESSION_NAMESID(session),
			mpf_termination_name_get(termination));

		/* send add termination request (add to media context) */
		if(mpf_engine_termination_message_add(
				session->base.media_engine,
				MPF_ADD_TERMINATION,session->context,termination,rtp_descriptor,
				&session->mpf_task_msg) == TRUE) {
			slot->waiting = TRUE;
			mrcp_client_session_subrequest_add(session);
		}
		mpf_engine_message_send(session->base.media_engine,&session->mpf_task_msg);
	}
	else {
		/* bypass media mode */
		if(channel->rtp_termination_slot) {
			rtp_descriptor = channel->rtp_termination_slot->descriptor;
			if(rtp_descriptor) {
				if(rtp_descriptor->audio.local) {
					session->offer->ip = rtp_descriptor->audio.local->ip;
					session->offer->ext_ip = rtp_descriptor->audio.local->ext_ip;
					rtp_descriptor->audio.local->id = mrcp_session_audio_media_add(session->offer,rtp_descriptor->audio.local);
					rtp_descriptor->audio.local->mid = session->offer->audio_media_arr->nelts;
					slot->id = session->offer->audio_media_arr->nelts - 1;
				}
			}
		}
	}

	slot->descriptor = rtp_descriptor;
	channel->rtp_termination_slot = slot;

	if(!session->subrequest_count) {
		/* send offer to server */
		mrcp_client_session_offer_send(session);
	}
	return TRUE;
}

static apt_bool_t mrcp_client_session_update(mrcp_client_session_t *session)
{
	if(!session->offer) {
		return FALSE;
	}
	apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Update Session "APT_NAMESID_FMT, 
		MRCP_SESSION_NAMESID(session));
	return mrcp_client_session_offer_send(session);
}

static apt_bool_t mrcp_client_session_terminate(mrcp_client_session_t *session)
{
	mrcp_channel_t *channel;
	rtp_termination_slot_t *slot;
	int i;
	
	apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Terminate Session "APT_NAMESID_FMT, 
		MRCP_SESSION_NAMESID(session));

	mrcp_client_session_state_set(session,SESSION_STATE_TERMINATING);
	if(session->context) {
		/* first destroy existing topology */
		if(mpf_engine_topology_message_add(
					session->base.media_engine,
					MPF_DESTROY_TOPOLOGY,session->context,
					&session->mpf_task_msg) == TRUE){
			mrcp_client_session_subrequest_add(session);
		}
	}
	/* remove existing control channels */
	for(i=0; i<session->channels->nelts; i++) {
		/* get existing channel */
		channel = APR_ARRAY_IDX(session->channels,i,mrcp_channel_t*);
		if(!channel) continue;

		if(channel->control_channel) {
			/* remove channel */
			apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Remove Control Channel "APT_NAMESID_FMT, 
				MRCP_SESSION_NAMESID(session));
			if(mrcp_client_control_channel_remove(channel->control_channel) == TRUE) {
				channel->waiting_for_channel = TRUE;
				mrcp_client_session_subrequest_add(session);
			}
		}

		/* send subtract termination request */
		if(channel->termination) {
			apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Subtract Media Termination "APT_NAMESIDRES_FMT, 
				MRCP_SESSION_NAMESID(session),
				mpf_termination_name_get(channel->termination));
			if(mpf_engine_termination_message_add(
					session->base.media_engine,
					MPF_SUBTRACT_TERMINATION,session->context,channel->termination,NULL,
					&session->mpf_task_msg) == TRUE) {
				channel->waiting_for_termination = TRUE;
				mrcp_client_session_subrequest_add(session);
			}
		}
	}

	if(session->context) {
		/* subtract existing terminations */
		for(i=0; i<session->terminations->nelts; i++) {
			/* get existing termination */
			slot = &APR_ARRAY_IDX(session->terminations,i,rtp_termination_slot_t);
			if(!slot->termination) continue;

			/* send subtract termination request */
			apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Subtract Media Termination "APT_NAMESIDRES_FMT, 
				MRCP_SESSION_NAMESID(session),
				mpf_termination_name_get(slot->termination));
			if(mpf_engine_termination_message_add(
					session->base.media_engine,
					MPF_SUBTRACT_TERMINATION,session->context,slot->termination,NULL,
					&session->mpf_task_msg) == TRUE) {
				slot->waiting = TRUE;
				mrcp_client_session_subrequest_add(session);
			}
		}

		mpf_engine_message_send(session->base.media_engine,&session->mpf_task_msg);
	}

	mrcp_client_session_subrequest_add(session);
	mrcp_session_terminate_request(&session->base);
	return TRUE;
}

static apt_bool_t mrcp_client_resource_discover(mrcp_client_session_t *session)
{
	mrcp_session_descriptor_t *descriptor = NULL;
	
	apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Discover Resources "APT_PTR_FMT, MRCP_SESSION_PTR(&session->base));
	session->answer = NULL;
	mrcp_client_session_state_set(session,SESSION_STATE_DISCOVERING);

	if(mrcp_session_version_get(session) == MRCP_VERSION_1) {
		mrcp_resource_t *resource;
		mrcp_resource_id i;

		for(i=0; i<MRCP_RESOURCE_TYPE_COUNT; i++) {
			resource = mrcp_resource_get(session->profile->resource_factory,i);
			if(!resource) continue;
		
			descriptor = mrcp_session_descriptor_create(session->base.pool);
			apt_string_copy(&descriptor->resource_name,&resource->name,session->base.pool);
			if(mrcp_session_discover_request(&session->base,descriptor) == TRUE) {
				mrcp_client_session_subrequest_add(session);
			}
		}
	}
	else {
		if(mrcp_session_discover_request(&session->base,descriptor) == TRUE) {
			mrcp_client_session_subrequest_add(session);
		}
	}

	if(session->subrequest_count == 0) {
		session->status = MRCP_SIG_STATUS_CODE_FAILURE;
		mrcp_app_sig_response_raise(session,TRUE);
	}
	return TRUE;
}

static apt_bool_t mrcp_client_on_termination_add(mrcp_client_session_t *session, const mpf_message_t *mpf_message)
{
	rtp_termination_slot_t *termination_slot;
	apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Media Termination Added "APT_NAMESIDRES_FMT, 
		MRCP_SESSION_NAMESID(session),
		mpf_termination_name_get(mpf_message->termination));
	termination_slot = mrcp_client_rtp_termination_find(session,mpf_message->termination);
	if(termination_slot) {
		/* rtp termination */
		mpf_rtp_termination_descriptor_t *rtp_descriptor;
		if(termination_slot->waiting == FALSE) {
			return FALSE;
		}
		termination_slot->waiting = FALSE;
		rtp_descriptor = mpf_message->descriptor;
		if(rtp_descriptor->audio.local) {
			session->offer->ip = rtp_descriptor->audio.local->ip;
			session->offer->ext_ip = rtp_descriptor->audio.local->ext_ip;
			rtp_descriptor->audio.local->id = mrcp_session_audio_media_add(session->offer,rtp_descriptor->audio.local);
			rtp_descriptor->audio.local->mid = session->offer->audio_media_arr->nelts;
			termination_slot->id = session->offer->audio_media_arr->nelts - 1;
		}
		if(mrcp_client_session_subrequest_remove(session) == TRUE) {
			/* send offer to server */
			mrcp_client_session_offer_send(session);
		}
	}
	else {
		/* channel termination */
		mrcp_channel_t *channel = mrcp_client_channel_termination_find(session,mpf_message->termination);
		if(channel && channel->waiting_for_termination == TRUE) {
			channel->waiting_for_termination = FALSE;
			if(mrcp_client_session_subrequest_remove(session) == TRUE) {
				/* send offer to server */
				mrcp_client_session_offer_send(session);
			}
		}
	}
	return TRUE;
}

static apt_bool_t mrcp_client_on_termination_modify(mrcp_client_session_t *session, const mpf_message_t *mpf_message)
{
	rtp_termination_slot_t *termination_slot;
	apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Media Termination Modified "APT_NAMESIDRES_FMT, 
		MRCP_SESSION_NAMESID(session),
		mpf_termination_name_get(mpf_message->termination));
	termination_slot = mrcp_client_rtp_termination_find(session,mpf_message->termination);
	if(termination_slot) {
		/* rtp termination */
		if(termination_slot->waiting == FALSE) {
			return FALSE;
		}
		termination_slot->waiting = FALSE;
		termination_slot->descriptor = mpf_message->descriptor;;

		if(mrcp_client_session_subrequest_remove(session) == TRUE) {
			if(session->state == SESSION_STATE_GENERATING_OFFER) {
				/* send offer to server */
				mrcp_client_session_offer_send(session);
			}
			else if(session->state == SESSION_STATE_PROCESSING_ANSWER) {
				/* raise app response */
				mrcp_app_sig_response_raise(session,TRUE);
			}
		}
	}
	return TRUE;
}

static apt_bool_t mrcp_client_on_termination_subtract(mrcp_client_session_t *session, const mpf_message_t *mpf_message)
{
	rtp_termination_slot_t *termination_slot;
	apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Media Termination Subtracted "APT_NAMESIDRES_FMT, 
		MRCP_SESSION_NAMESID(session),
		mpf_termination_name_get(mpf_message->termination));
	termination_slot = mrcp_client_rtp_termination_find(session,mpf_message->termination);
	if(termination_slot) {
		/* rtp termination */
		if(termination_slot->waiting == FALSE) {
			return FALSE;
		}
		termination_slot->waiting = FALSE;
		if(mrcp_client_session_subrequest_remove(session) == TRUE) {
			mrcp_app_session_terminate_raise(session,MRCP_SIG_STATUS_CODE_SUCCESS);
		}
	}
	else {
		/* channel termination */
		mrcp_channel_t *channel = mrcp_client_channel_termination_find(session,mpf_message->termination);
		if(channel && channel->waiting_for_termination == TRUE) {
			channel->waiting_for_termination = FALSE;
			if(mrcp_client_session_subrequest_remove(session) == TRUE) {
				/* raise app response */
				mrcp_app_sig_response_raise(session,TRUE);
			}
		}
	}
	return TRUE;
}

apt_bool_t mrcp_client_mpf_message_process(mpf_message_container_t *mpf_message_container)
{
	apr_size_t i;
	mrcp_client_session_t *session;
	const mpf_message_t *mpf_message;
	for(i=0; i<mpf_message_container->count; i++) {
		mpf_message = &mpf_message_container->messages[i];
		if(mpf_message->context) {
			session = mpf_engine_context_object_get(mpf_message->context);
		}
		else {
			session = NULL;
		}
		if(!session) {
			apt_log(APT_LOG_MARK,APT_PRIO_DEBUG,"Received MPF Message: NULL session");
			continue;
		}
		if(mpf_message->message_type == MPF_MESSAGE_TYPE_RESPONSE) {
			switch(mpf_message->command_id) {
				case MPF_ADD_TERMINATION:
					mrcp_client_on_termination_add(session,mpf_message);
					break;
				case MPF_MODIFY_TERMINATION:
					mrcp_client_on_termination_modify(session,mpf_message);
					break;
				case MPF_SUBTRACT_TERMINATION:
					mrcp_client_on_termination_subtract(session,mpf_message);
					break;
				case MPF_ADD_ASSOCIATION:
				case MPF_REMOVE_ASSOCIATION:
				case MPF_RESET_ASSOCIATIONS:
				case MPF_APPLY_TOPOLOGY:
				case MPF_DESTROY_TOPOLOGY:
					if(mrcp_client_session_subrequest_remove(session) == TRUE) {
						if(session->state == SESSION_STATE_GENERATING_OFFER) {
							/* send offer to server */
							mrcp_client_session_offer_send(session);
						}
						else if(session->state == SESSION_STATE_PROCESSING_ANSWER) {
							/* raise app response */
							mrcp_app_sig_response_raise(session,TRUE);
						}
					}
					break;
				default:
					break;
			}
		}
		else if(mpf_message->message_type == MPF_MESSAGE_TYPE_EVENT) {
			apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Process MPF Event "APT_NAMESID_FMT,
				MRCP_SESSION_NAMESID(session));
		}
	}
	return TRUE;
}

static apt_bool_t mrcp_client_resource_answer_process(mrcp_client_session_t *session, mrcp_session_descriptor_t *descriptor)
{
	apt_bool_t status = TRUE;
	if(session->offer->resource_state == TRUE) {
		if(descriptor->resource_state == TRUE) {
			mrcp_client_av_media_answer_process(session,descriptor);
		}
		else {
			status = FALSE;
		}
	}
	return status;
}

static apt_bool_t mrcp_client_control_media_answer_process(mrcp_client_session_t *session, mrcp_session_descriptor_t *descriptor)
{
	mrcp_channel_t *channel;
	mrcp_control_descriptor_t *control_descriptor;
	int i;
	int count = session->channels->nelts;
	if(count != descriptor->control_media_arr->nelts) {
		apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"Number of control channels [%d] != Number of control media in answer [%d]",
			count,descriptor->control_media_arr->nelts);
		count = descriptor->control_media_arr->nelts;
	}

	if(!session->base.id.length) {
		/* initial answer received, store session id and add to session's table */
		control_descriptor = mrcp_session_control_media_get(descriptor,0);
		if(control_descriptor) {
			session->base.id = control_descriptor->session_id;
		}
	}

	/* update existing control channels */
	for(i=0; i<count; i++) {
		/* get existing channel */
		channel = APR_ARRAY_IDX(session->channels,i,mrcp_channel_t*);
		if(!channel) continue;

		/* get control descriptor */
		control_descriptor = mrcp_session_control_media_get(descriptor,i);
		/* modify channel */
		apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Modify Control Channel "APT_NAMESID_FMT, 
			MRCP_SESSION_NAMESID(session));
		if(mrcp_client_control_channel_modify(channel->control_channel,control_descriptor) == TRUE) {
			channel->waiting_for_channel = TRUE;
			mrcp_client_session_subrequest_add(session);
		}
	}
	return TRUE;
}

static apt_bool_t mrcp_client_av_media_answer_process(mrcp_client_session_t *session, mrcp_session_descriptor_t *descriptor)
{
	rtp_termination_slot_t *slot;
	int i;
	int count = session->terminations->nelts;
	if(count != descriptor->audio_media_arr->nelts) {
		apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"Number of terminations [%d] != Number of audio media in answer [%d]",
			count,descriptor->audio_media_arr->nelts);
		count = descriptor->audio_media_arr->nelts;
	}
	
	/* update existing terminations */
	for(i=0; i<count; i++) {
		mpf_rtp_media_descriptor_t *remote_media;
		mpf_rtp_termination_descriptor_t *rtp_descriptor;
		/* get existing termination */
		slot = &APR_ARRAY_IDX(session->terminations,i,rtp_termination_slot_t);
		remote_media = mrcp_session_audio_media_get(descriptor,i);
		if(slot->descriptor) {
			slot->descriptor->audio.remote = remote_media;
		}
		if(slot->termination) {
			/* construct termination descriptor */
			rtp_descriptor = apr_palloc(session->base.pool,sizeof(mpf_rtp_termination_descriptor_t));
			mpf_rtp_termination_descriptor_init(rtp_descriptor);
			rtp_descriptor->audio.local = NULL;
			rtp_descriptor->audio.remote = remote_media;

			/* send modify termination request */
			apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Modify Media Termination "APT_NAMESIDRES_FMT, 
				MRCP_SESSION_NAMESID(session),
				mpf_termination_name_get(slot->termination));
			if(mpf_engine_termination_message_add(
					session->base.media_engine,
					MPF_MODIFY_TERMINATION,session->context,slot->termination,rtp_descriptor,
					&session->mpf_task_msg) == TRUE) {
				slot->waiting = TRUE;
				mrcp_client_session_subrequest_add(session);
			}
			if(slot->channel && slot->channel->termination) {
				if(mpf_engine_assoc_message_add(
						session->base.media_engine,
						MPF_ADD_ASSOCIATION,session->context,slot->termination,slot->channel->termination,
						&session->mpf_task_msg) == TRUE) {
					mrcp_client_session_subrequest_add(session);
				}
			}
		}
	}
	return TRUE;
}

static apt_bool_t mrcp_app_request_dispatch(mrcp_client_session_t *session, const mrcp_app_message_t *app_message)
{
	if(session->state == SESSION_STATE_TERMINATING) {
		/* no more requests are allowed, as session is being terminated!
		   just return, it is horribly wrong and can crash anytime here */
		apt_obj_log(APT_LOG_MARK,APT_PRIO_ERROR,session->base.log_obj,"Inappropriate Application Request "APT_NAMESID_FMT" [%d]",
			MRCP_SESSION_NAMESID(session),
			app_message->sig_message.command_id);
		return FALSE;
	}

	if(session->disconnected == TRUE) {
		/* cancel all the requests besides session termination one */
		if(!IS_SESSION_TERMINATE(app_message)) {
			apt_obj_log(APT_LOG_MARK,APT_PRIO_WARNING,session->base.log_obj,"Cancel App Request "APT_NAMESID_FMT" [%d]",
				MRCP_SESSION_NAMESID(session), app_message->sig_message.command_id);
			session->status = MRCP_SIG_STATUS_CODE_CANCEL;
			return mrcp_app_failure_message_raise(session);
		}
	}

	if(session->registered == FALSE) {
		if(IS_SESSION_TERMINATE(app_message)) {
			/* if session is not registered, nothing to terminate, just respond with success */
			session->status = MRCP_SIG_STATUS_CODE_SUCCESS;
			return mrcp_app_sig_response_raise(session,FALSE);
		}

		/* select signaling agent */
		session->base.signaling_agent = mrcp_sa_factory_agent_select(session->profile->sa_factory);
		if(!session->base.signaling_agent) {
			apt_obj_log(APT_LOG_MARK,APT_PRIO_WARNING,session->base.log_obj,"Failed to Select Signaling Agent "APT_NAMESID_FMT" [%d]",
				MRCP_SESSION_NAMESID(session),
				app_message->sig_message.command_id);
			session->status = MRCP_SIG_STATUS_CODE_FAILURE;
		}
		if(session->profile->mrcp_version == MRCP_VERSION_2) {
			/* select connection agent */
			session->base.connection_agent = mrcp_ca_factory_agent_select(session->profile->ca_factory);
			if(!session->base.connection_agent) {
				apt_obj_log(APT_LOG_MARK,APT_PRIO_WARNING,session->base.log_obj,"Failed to Select Connection Agent "APT_NAMESID_FMT" [%d]",
					MRCP_SESSION_NAMESID(session),
					app_message->sig_message.command_id);
				session->status = MRCP_SIG_STATUS_CODE_FAILURE;
			}
		}
		if(session->profile->mpf_factory) {
			/* select media engine */
			session->base.media_engine = mpf_engine_factory_engine_select(session->profile->mpf_factory);
			if(!session->base.media_engine) {
				apt_obj_log(APT_LOG_MARK,APT_PRIO_WARNING,session->base.log_obj,"Failed to Select Media Engine "APT_NAMESID_FMT" [%d]",
					MRCP_SESSION_NAMESID(session),
					app_message->sig_message.command_id);
				session->status = MRCP_SIG_STATUS_CODE_FAILURE;
			}
		}
		/* set rtp termination factory */
		session->base.rtp_factory = session->profile->rtp_termination_factory;

		if(session->status == MRCP_SIG_STATUS_CODE_FAILURE) {
			/* raise app response in case of failure */
			return mrcp_app_failure_message_raise(session);
		}

		if(session->base.signaling_agent->create_client_session(&session->base,session->profile->signaling_settings) != TRUE) {
			/* raise app response */
			apt_obj_log(APT_LOG_MARK,APT_PRIO_WARNING,session->base.log_obj,"Failed to Create Session "APT_NAMESID_FMT" [%d]",
				MRCP_SESSION_NAMESID(session),
				app_message->sig_message.command_id);
			session->status = MRCP_SIG_STATUS_CODE_FAILURE;
			return mrcp_app_failure_message_raise(session);
		}

		mrcp_client_session_add(session->application->client,session);
		session->registered = TRUE;
	}
	session->status = MRCP_SIG_STATUS_CODE_SUCCESS;
	switch(app_message->message_type) {
		case MRCP_APP_MESSAGE_TYPE_SIGNALING:
		{
			apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Dispatch App Request "APT_NAMESID_FMT" [%d]",
				MRCP_SESSION_NAMESID(session),
				app_message->sig_message.command_id);
			switch(app_message->sig_message.command_id) {
				case MRCP_SIG_COMMAND_SESSION_UPDATE:
					mrcp_client_session_update(session);
					break;
				case MRCP_SIG_COMMAND_SESSION_TERMINATE:
					mrcp_client_session_terminate(session);
					break;
				case MRCP_SIG_COMMAND_CHANNEL_ADD:
					mrcp_client_channel_add(session,app_message->channel);
					break;
				case MRCP_SIG_COMMAND_CHANNEL_REMOVE:
					mrcp_client_channel_modify(session,app_message->channel,FALSE);
					break;
				case MRCP_SIG_COMMAND_RESOURCE_DISCOVER:
					mrcp_client_resource_discover(session);
					break;
				default:
					break;
			}
			break;
		}
		case MRCP_APP_MESSAGE_TYPE_CONTROL:
		{
			mrcp_client_message_send(session,app_message->channel,app_message->control_message);
			break;
		}
	}
	return TRUE;
}