mrcp_server_session.h

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/*
 * Copyright 2008-2015 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.
 */

#ifndef MRCP_SERVER_SESSION_H
#define MRCP_SERVER_SESSION_H

/**
 * @file mrcp_server_session.h
 * @brief MRCP Server Session
 */ 

#include <apr_hash.h>
#include "mrcp_session.h"
#include "mpf_engine.h"
#include "apt_task.h"
#include "apt_obj_list.h"


APT_BEGIN_EXTERN_C

/** Opaque MRCP channel declaration */
typedef struct mrcp_channel_t mrcp_channel_t;
/** MRCP server session declaration */
typedef struct mrcp_server_session_t mrcp_server_session_t;
/** MRCP signaling message declaration */
typedef struct mrcp_signaling_message_t mrcp_signaling_message_t;

/** Enumeration of signaling task messages */
typedef enum {
    SIGNALING_MESSAGE_OFFER,
    SIGNALING_MESSAGE_CONTROL,
    SIGNALING_MESSAGE_TERMINATE,
} mrcp_signaling_message_type_e;

/** MRCP signaling message */
struct mrcp_signaling_message_t {
    /** Signaling message type */
    mrcp_signaling_message_type_e type;

    /** Session */
    mrcp_server_session_t        *session;
    /** Descriptor */
    mrcp_session_descriptor_t    *descriptor;

    /** Channel */
    mrcp_channel_t               *channel;
    /** MRCP message */
    mrcp_message_t               *message;
};

/** Server session states */
typedef enum {
    SESSION_STATE_NONE,              /**< initial state */
    SESSION_STATE_GENERATING_ANSWER, /**< received offer, generating answer now */
    SESSION_STATE_INITIALIZING,      /**< answer is ready, finally initializing channels now */
    SESSION_STATE_DEACTIVATING,      /**< received session termination request, deinitializing channels now */
    SESSION_STATE_TERMINATING        /**< finally terminating session */
} mrcp_server_session_state_e;


/** MRCP server session */
struct mrcp_server_session_t {
    /** Session base */
    mrcp_session_t              base;
    /** MRCP server */
    mrcp_server_t              *server;
    /** MRCP profile */
    mrcp_server_profile_t      *profile;

    /** Media context */
    mpf_context_t              *context;

    /** Media termination array */
    apr_array_header_t         *terminations;
    /** MRCP control channel array */
    apr_array_header_t         *channels;

    /** In-progress signaling request */
    mrcp_signaling_message_t   *active_request;
    /** Signaling request queue */
    apt_obj_list_t             *request_queue;

    /** In-progress offer */
    mrcp_session_descriptor_t  *offer;
    /** In-progres answer */
    mrcp_session_descriptor_t  *answer;

    /** Last offer received */
    mrcp_session_descriptor_t  *last_offer;
    /** Last answer sent */
    mrcp_session_descriptor_t  *last_answer;

    /** MPF task message, which construction is in progress */
    mpf_task_msg_t             *mpf_task_msg;

    /** Session state */
    mrcp_server_session_state_e state;
    /** Number of in-progress sub requests */
    apr_size_t                  subrequest_count;
};

/** MRCP server profile */
struct mrcp_server_profile_t {
    /** Identifier of the profile */
    const char                *id;
    /** MRCP version */
    mrcp_version_e             mrcp_version;
    /** Table of engines (mrcp_engine_settings_t*) */
    apr_hash_t                *engine_table;
    /** MRCP resource factory */
    mrcp_resource_factory_t   *resource_factory;
    /** Media processing engine */
    mpf_engine_t              *media_engine;
    /** RTP termination factory */
    mpf_termination_factory_t *rtp_termination_factory;
    /** RTP settings */
    mpf_rtp_settings_t        *rtp_settings;
    /** Signaling agent */
    mrcp_sig_agent_t          *signaling_agent;
    /** Connection agent */
    mrcp_connection_agent_t   *connection_agent;
};

/** Create server session */
mrcp_server_session_t* mrcp_server_session_create(void);

/** Process signaling message */
apt_bool_t mrcp_server_signaling_message_process(mrcp_signaling_message_t *signaling_message);
/** Process MPF message */
apt_bool_t mrcp_server_mpf_message_process(mpf_message_container_t *mpf_message_container);

/** Process channel modify event */
apt_bool_t mrcp_server_on_channel_modify(mrcp_channel_t *channel, mrcp_control_descriptor_t *answer, apt_bool_t status);
/** Process channel remove event */
apt_bool_t mrcp_server_on_channel_remove(mrcp_channel_t *channel, apt_bool_t status);
/** Process channel message receive */
apt_bool_t mrcp_server_on_channel_message(mrcp_channel_t *channel, mrcp_message_t *message);
/** Process connection disconnect event */
apt_bool_t mrcp_server_on_disconnect(mrcp_channel_t *channel);

/** Process channel open event */
apt_bool_t mrcp_server_on_engine_channel_open(mrcp_channel_t *channel, apt_bool_t status);
/** Process channel close event */
apt_bool_t mrcp_server_on_engine_channel_close(mrcp_channel_t *channel);
/** Process message receive event */
apt_bool_t mrcp_server_on_engine_channel_message(mrcp_channel_t *channel, mrcp_message_t *message);

/** Get session by channel */
mrcp_session_t* mrcp_server_channel_session_get(mrcp_channel_t *channel);

APT_END_EXTERN_C

#endif /* MRCP_SERVER_SESSION_H */