mpf_message.h

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/*
 * 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: mpf_message.h 2136 2014-07-04 06:33:36Z achaloyan@gmail.com $
 */

#ifndef MPF_MESSAGE_H
#define MPF_MESSAGE_H

/**
 * @file mpf_message.h
 * @brief Media Processing Framework Message Definitions
 */ 

#include "mpf_types.h"

APT_BEGIN_EXTERN_C

/** Max number of messages grouped in a container */
#define MAX_MPF_MESSAGE_COUNT 5

/** Enumeration of MPF message types */
typedef enum {
    MPF_MESSAGE_TYPE_REQUEST,  /**< request message */
    MPF_MESSAGE_TYPE_RESPONSE, /**< response message */
    MPF_MESSAGE_TYPE_EVENT     /**< event message */
} mpf_message_type_e;

/** Enumeration of MPF status codes */
typedef enum {
    MPF_STATUS_CODE_SUCCESS,  /**< indicates success */
    MPF_STATUS_CODE_FAILURE   /**< indicates failure */
} mpf_status_code_e;


/** Enumeration of MPF commands */
typedef enum {
    MPF_ADD_TERMINATION,     /**< add termination to context */
    MPF_MODIFY_TERMINATION,  /**< modify termination properties */
    MPF_SUBTRACT_TERMINATION,/**< subtract termination from context */
    MPF_ADD_ASSOCIATION,     /**< add association between terminations */
    MPF_REMOVE_ASSOCIATION,  /**< remove association between terminations */
    MPF_RESET_ASSOCIATIONS,  /**< reset associations among terminations (also destroy topology) */
    MPF_APPLY_TOPOLOGY,      /**< apply topology based on assigned associations */
    MPF_DESTROY_TOPOLOGY     /**< destroy applied topology */
} mpf_command_type_e;

/** MPF message declaration */
typedef struct mpf_message_t mpf_message_t;
/** MPF message container declaration */
typedef struct mpf_message_container_t mpf_message_container_t;

/** MPF message definition */
struct mpf_message_t {
    /** Message type (request/response/event) */
    mpf_message_type_e message_type;
    /** Command identifier (add, modify, subtract, ...) */
    mpf_command_type_e command_id;
    /** Status code used in responses */
    mpf_status_code_e  status_code;

    /** Context */
    mpf_context_t     *context;
    /** Termination */
    mpf_termination_t *termination;
    /** Associated termination */
    mpf_termination_t *assoc_termination;
    /** Termination type dependent descriptor */
    void              *descriptor;
};

/** MPF message container definition */
struct mpf_message_container_t {
    /** Number of actual messages */
    apr_size_t    count;
    /** Array of messages */
    mpf_message_t messages[MAX_MPF_MESSAGE_COUNT];
};

APT_END_EXTERN_C

#endif /* MPF_MESSAGE_H */