mrcp_engine_types.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_ENGINE_TYPES_H
#define MRCP_ENGINE_TYPES_H

/**
 * @file mrcp_engine_types.h
 * @brief MRCP Engine Types
 */ 

#include <apr_tables.h>
#include "mrcp_state_machine.h"
#include "mpf_types.h"
#include "apt_string.h"

APT_BEGIN_EXTERN_C

/** MRCP engine declaration */
typedef struct mrcp_engine_t mrcp_engine_t;
/** MRCP engine config declaration */
typedef struct mrcp_engine_config_t mrcp_engine_config_t;
/** MRCP engine vtable declaration */
typedef struct mrcp_engine_method_vtable_t mrcp_engine_method_vtable_t;
/** MRCP engine event vtable declaration */
typedef struct mrcp_engine_event_vtable_t mrcp_engine_event_vtable_t;
/** MRCP engine channel declaration */
typedef struct mrcp_engine_channel_t mrcp_engine_channel_t;
/** MRCP engine channel virtual method table declaration */
typedef struct mrcp_engine_channel_method_vtable_t mrcp_engine_channel_method_vtable_t;
/** MRCP engine channel virtual event table declaration */
typedef struct mrcp_engine_channel_event_vtable_t mrcp_engine_channel_event_vtable_t;

/** Table of channel virtual methods */
struct mrcp_engine_channel_method_vtable_t {
    /** Virtual destroy */
    apt_bool_t (*destroy)(mrcp_engine_channel_t *channel);
    /** Virtual open */
    apt_bool_t (*open)(mrcp_engine_channel_t *channel);
    /** Virtual close */
    apt_bool_t (*close)(mrcp_engine_channel_t *channel);
    /** Virtual process_request */
    apt_bool_t (*process_request)(mrcp_engine_channel_t *channel, mrcp_message_t *request);
};

/** Table of channel virtual event handlers */
struct mrcp_engine_channel_event_vtable_t {
    /** Open event handler */
    apt_bool_t (*on_open)(mrcp_engine_channel_t *channel, apt_bool_t status);
    /** Close event handler */
    apt_bool_t (*on_close)(mrcp_engine_channel_t *channel);
    /** Message event handler */
    apt_bool_t (*on_message)(mrcp_engine_channel_t *channel, mrcp_message_t *message);
};

/** MRCP engine channel declaration */
struct mrcp_engine_channel_t {
    /** Table of virtual methods */
    const mrcp_engine_channel_method_vtable_t *method_vtable;
    /** External object used with virtual methods */
    void                                      *method_obj;
    /** Table of virtual event handlers */
    const mrcp_engine_channel_event_vtable_t  *event_vtable;
    /** External object used with event handlers */
    void                                      *event_obj;
    /** Media termination */
    mpf_termination_t                         *termination;
    /** Back pointer to engine */
    mrcp_engine_t                             *engine;
    /** Unique identifier to be used in traces */
    apt_str_t                                  id;
    /** MRCP version */
    mrcp_version_e                             mrcp_version;
    /** Is channel successfully opened */
    apt_bool_t                                is_open;
    /** Pool to allocate memory from */
    apr_pool_t                                *pool;
};

/** Table of MRCP engine virtual methods */
struct mrcp_engine_method_vtable_t {
    /** Virtual destroy */
    apt_bool_t (*destroy)(mrcp_engine_t *engine);
    /** Virtual open */
    apt_bool_t (*open)(mrcp_engine_t *engine);
    /** Virtual close */
    apt_bool_t (*close)(mrcp_engine_t *engine);
    /** Virtual channel create */
    mrcp_engine_channel_t* (*create_channel)(mrcp_engine_t *engine, apr_pool_t *pool);
};

/** Table of MRCP engine virtual event handlers */
struct mrcp_engine_event_vtable_t {
    /** Open event handler */
    apt_bool_t (*on_open)(mrcp_engine_t *channel, apt_bool_t status);
    /** Close event handler */
    apt_bool_t (*on_close)(mrcp_engine_t *channel);
};

/** MRCP engine */
struct mrcp_engine_t {
    /** Identifier of the engine */
    const char                        *id;
    /** Resource identifier */
    mrcp_resource_id                   resource_id;
    /** External object associated with engine */
    void                              *obj;
    /** Table of virtual methods */
    const mrcp_engine_method_vtable_t *method_vtable;
    /** Table of virtual event handlers */
    const mrcp_engine_event_vtable_t  *event_vtable;
    /** External object used with event handlers */
    void                              *event_obj;
    /** Codec manager */
    const mpf_codec_manager_t         *codec_manager;
    /** Dir layout structure */
    const apt_dir_layout_t            *dir_layout;
    /** Config of engine */
    mrcp_engine_config_t              *config;
    /** Number of simultaneous channels currently in use */
    apr_size_t                         cur_channel_count;
    /** Is engine successfully opened */
    apt_bool_t                         is_open;
    /** Pool to allocate memory from */
    apr_pool_t                        *pool;

    /** Create state machine */
    mrcp_state_machine_t* (*create_state_machine)(void *obj, mrcp_version_e version, apr_pool_t *pool);
};

/** MRCP engine config */
struct mrcp_engine_config_t {
    /** Max number of simultaneous channels */
    apr_size_t   max_channel_count;
    /** Table of name/value string params */
    apr_table_t *params;
};

APT_END_EXTERN_C

#endif /* MRCP_ENGINE_TYPES_H */