508 lines
18 KiB
C
508 lines
18 KiB
C
/*
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* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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* Copyright (C) 2005/2006, Anthony Minessale II <anthmct@yahoo.com>
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*
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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*
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* The Initial Developer of the Original Code is
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* Anthony Minessale II <anthmct@yahoo.com>
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* Portions created by the Initial Developer are Copyright (C)
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Anthony Minessale II <anthmct@yahoo.com>
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*
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*
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* switch_module_interfaces.h -- Module Interface Definitions
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*
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*/
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/*! \file switch_module_interfaces.h
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\brief Module Interface Definitions
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This module holds the definition of data abstractions used to implement various pluggable
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interfaces and pluggable event handlers.
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*/
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#ifndef SWITCH_MODULE_INTERFACES_H
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#define SWITCH_MODULE_INTERFACES_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <switch.h>
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/*! \brief A table of functions to execute at various states
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*/
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struct switch_state_handler_table {
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/*! executed when the state changes to init */
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switch_state_handler on_init;
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/*! executed when the state changes to ring */
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switch_state_handler on_ring;
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/*! executed when the state changes to execute */
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switch_state_handler on_execute;
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/*! executed when the state changes to hangup */
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switch_state_handler on_hangup;
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/*! executed when the state changes to loopback*/
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switch_state_handler on_loopback;
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/*! executed when the state changes to transmit*/
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switch_state_handler on_transmit;
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};
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/*! \brief Node in which to store custom outgoing channel callback hooks */
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struct switch_io_event_hook_outgoing_channel {
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/*! the outgoing channel callback hook*/
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switch_outgoing_channel_hook outgoing_channel;
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struct switch_io_event_hook_outgoing_channel *next;
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};
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/*! \brief Node in which to store custom answer channel callback hooks */
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struct switch_io_event_hook_answer_channel {
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/*! the answer channel callback hook*/
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switch_answer_channel_hook answer_channel;
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struct switch_io_event_hook_answer_channel *next;
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};
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/*! \brief Node in which to store custom receive message callback hooks */
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struct switch_io_event_hook_receive_message {
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/*! the answer channel callback hook*/
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switch_receive_message_hook receive_message;
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struct switch_io_event_hook_receive_message *next;
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};
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/*! \brief Node in which to store custom read frame channel callback hooks */
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struct switch_io_event_hook_read_frame {
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/*! the read frame channel callback hook*/
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switch_read_frame_hook read_frame;
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struct switch_io_event_hook_read_frame *next;
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};
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/*! \brief Node in which to store custom write_frame channel callback hooks */
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struct switch_io_event_hook_write_frame {
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/*! the write_frame channel callback hook*/
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switch_write_frame_hook write_frame;
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struct switch_io_event_hook_write_frame *next;
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};
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/*! \brief Node in which to store custom kill channel callback hooks */
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struct switch_io_event_hook_kill_channel {
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/*! the kill channel callback hook*/
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switch_kill_channel_hook kill_channel;
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struct switch_io_event_hook_kill_channel *next;
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};
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/*! \brief Node in which to store custom waitfor read channel callback hooks */
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struct switch_io_event_hook_waitfor_read {
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/*! the waitfor read channel callback hook*/
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switch_waitfor_read_hook waitfor_read;
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struct switch_io_event_hook_waitfor_read *next;
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};
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/*! \brief Node in which to store custom waitfor write channel callback hooks */
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struct switch_io_event_hook_waitfor_write {
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/*! the waitfor write channel callback hook*/
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switch_waitfor_write_hook waitfor_write;
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struct switch_io_event_hook_waitfor_write *next;
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};
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/*! \brief Node in which to store custom send dtmf channel callback hooks */
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struct switch_io_event_hook_send_dtmf {
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/*! the send dtmf channel callback hook*/
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switch_send_dtmf_hook send_dtmf;
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struct switch_io_event_hook_send_dtmf *next;
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};
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/*! \brief A table of lists of io_event_hooks to store the event hooks associated with a session */
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struct switch_io_event_hooks {
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/*! a list of outgoing channel hooks */
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struct switch_io_event_hook_outgoing_channel *outgoing_channel;
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/*! a list of answer channel hooks */
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struct switch_io_event_hook_answer_channel *answer_channel;
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/*! a list of receive message hooks */
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struct switch_io_event_hook_receive_message *receive_message;
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/*! a list of read frame hooks */
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struct switch_io_event_hook_read_frame *read_frame;
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/*! a list of write frame hooks */
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struct switch_io_event_hook_write_frame *write_frame;
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/*! a list of kill channel hooks */
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struct switch_io_event_hook_kill_channel *kill_channel;
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/*! a list of wait for read hooks */
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struct switch_io_event_hook_waitfor_read *waitfor_read;
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/*! a list of wait for write hooks */
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struct switch_io_event_hook_waitfor_write *waitfor_write;
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/*! a list of send dtmf hooks */
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struct switch_io_event_hook_send_dtmf *send_dtmf;
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};
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/*! \brief A table of i/o routines that an endpoint interface can implement */
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struct switch_io_routines {
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/*! creates an outgoing session from given session, caller profile */
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switch_status (*outgoing_channel)(switch_core_session *, switch_caller_profile *, switch_core_session **, switch_memory_pool *);
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/*! answers the given session's channel */
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switch_status (*answer_channel)(switch_core_session *);
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/*! read a frame from a session */
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switch_status (*read_frame)(switch_core_session *, switch_frame **, int, switch_io_flag, int);
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/*! write a frame to a session */
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switch_status (*write_frame)(switch_core_session *, switch_frame *, int, switch_io_flag, int);
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/*! send a kill signal to the session's channel */
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switch_status (*kill_channel)(switch_core_session *, int);
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/*! wait for the session's channel to be ready to read audio */
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switch_status (*waitfor_read)(switch_core_session *, int, int);
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/*! wait for the session's channel to be ready to write audio */
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switch_status (*waitfor_write)(switch_core_session *, int, int);
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/*! send a string of DTMF digits to a session's channel */
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switch_status (*send_dtmf)(switch_core_session *, char *);
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/*! receive a message from another session*/
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switch_status (*receive_message)(switch_core_session *, switch_core_session_message *);
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};
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/*! \brief Abstraction of an module endpoint interface
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This is the glue between the abstract idea of a "channel" and what is really going on under the
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hood. Each endpoint module fills out one of these tables and makes it available when a channel
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is created of it's paticular type.
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*/
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struct switch_endpoint_interface {
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/*! the interface's name */
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const char *interface_name;
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/*! channel abstraction methods */
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const switch_io_routines *io_routines;
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/*! state machine methods */
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const switch_state_handler_table *state_handler;
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/*! private information */
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void *private_info;
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/* to facilitate linking */
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const struct switch_endpoint_interface *next;
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};
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/*! \brief Abstract handler to a timer module */
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struct switch_timer {
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/*! time interval expressed in milliseconds */
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int interval;
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/*! flags to control behaviour */
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unsigned int flags;
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/*! sample count to increment by on each cycle */
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unsigned int samples;
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/*! current sample count based on samples parameter */
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unsigned int samplecount;
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/*! the timer interface provided from a loadable module */
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struct switch_timer_interface *timer_interface;
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/*! the timer's memory pool */
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switch_memory_pool *memory_pool;
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/*! private data for loadable modules to store information */
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void *private_info;
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};
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/*! \brief A table of functions that a timer module implements */
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struct switch_timer_interface {
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/*! the name of the interface */
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const char *interface_name;
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/*! function to allocate the timer */
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switch_status (*timer_init)(switch_timer *);
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/*! function to wait for one cycle to pass */
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switch_status (*timer_next)(switch_timer *);
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/*! function to deallocate the timer */
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switch_status (*timer_destroy)(switch_timer *);
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const struct switch_timer_interface *next;
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};
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/*! \brief Abstract interface to a dialplan module */
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struct switch_dialplan_interface {
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/*! the name of the interface */
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const char *interface_name;
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/*! the function to read an extension and set a channels dialpan */
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switch_dialplan_hunt_function hunt_function;
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const struct switch_dialplan_interface *next;
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};
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/*! \brief Abstract interface to a file format module */
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struct switch_file_interface {
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/*! the name of the interface */
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const char *interface_name;
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/*! function to open the file */
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switch_status (*file_open)(switch_file_handle *, char *file_path);
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/*! function to close the file */
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switch_status (*file_close)(switch_file_handle *);
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/*! function to read from the file */
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switch_status (*file_read)(switch_file_handle *, void *data, size_t *len);
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/*! function to write from the file */
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switch_status (*file_write)(switch_file_handle *, void *data, size_t *len);
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/*! function to seek to a certian position in the file */
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switch_status (*file_seek)(switch_file_handle *, unsigned int *cur_pos, int64_t samples, int whence);
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/*! list of supported file extensions */
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char **extens;
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const struct switch_file_interface *next;
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};
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/*! an abstract representation of a file handle (some parameters based on compat with libsndfile) */
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struct switch_file_handle {
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/*! the interface of the module that implemented the current file type */
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const struct switch_file_interface *file_interface;
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/*! flags to control behaviour */
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unsigned int flags;
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/*! a file descriptor if neceessary */
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switch_file_t *fd;
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/*! samples position of the handle */
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unsigned int samples;
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/*! the current samplerate */
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unsigned int samplerate;
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/*! the number of channels */
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unsigned int channels;
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/*! integer representation of the format */
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unsigned int format;
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/*! integer representation of the sections */
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unsigned int sections;
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/*! is the file seekable */
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int seekable;
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/*! the sample count of the file */
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unsigned int sample_count;
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/*! the speed of the file playback*/
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int speed;
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/*! the handle's memory pool */
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switch_memory_pool *memory_pool;
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/*! private data for the format module to store handle specific info */
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void *private_info;
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int64_t pos;
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switch_buffer *audio_buffer;
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};
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/*! \brief Abstract interface to a speech module */
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struct switch_speech_interface {
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/*! the name of the interface */
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const char *interface_name;
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/*! function to open the speech interface */
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switch_status (*speech_open)(switch_speech_handle *sh,
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char *voice_name,
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int rate,
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switch_speech_flag *flags);
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/*! function to close the speech interface */
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switch_status (*speech_close)(switch_speech_handle *, switch_speech_flag *flags);
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/*! function to feed audio to the ASR*/
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switch_status (*speech_feed_asr)(switch_speech_handle *sh, void *data, unsigned int *len, int rate, switch_speech_flag *flags);
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/*! function to read text from the ASR*/
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switch_status (*speech_interpret_asr)(switch_speech_handle *sh, char *buf, unsigned int buflen, switch_speech_flag *flags);
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/*! function to feed text to the TTS*/
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switch_status (*speech_feed_tts)(switch_speech_handle *sh, char *text, switch_speech_flag *flags);
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/*! function to read audio from the TTS*/
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switch_status (*speech_read_tts)(switch_speech_handle *sh,
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void *data,
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size_t *datalen,
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size_t *rate,
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switch_speech_flag *flags);
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const struct switch_speech_interface *next;
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};
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/*! an abstract representation of a asr/tts speech interface. */
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struct switch_speech_handle {
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/*! the interface of the module that implemented the current speech interface */
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const struct switch_speech_interface *speech_interface;
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/*! flags to control behaviour */
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unsigned int flags;
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/*! the handle's memory pool */
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switch_memory_pool *memory_pool;
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/*! private data for the format module to store handle specific info */
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void *private_info;
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};
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/*! \brief Abstract interface to a directory module */
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struct switch_directory_interface {
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/*! the name of the interface */
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const char *interface_name;
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/*! function to open the directory interface */
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switch_status (*directory_open)(switch_directory_handle *dh, char *source, char *dsn, char *passwd);
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/*! function to close the directory interface */
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switch_status (*directory_close)(switch_directory_handle *dh);
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/*! function to query the directory interface */
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switch_status (*directory_query)(switch_directory_handle *dh, char *base, char *query);
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/*! function to advance to the next record */
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switch_status (*directory_next)(switch_directory_handle *dh);
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/*! function to advance to the next name/value pair in the current record */
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switch_status (*directory_next_pair)(switch_directory_handle *dh, char **var, char **val);
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const struct switch_directory_interface *next;
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};
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/*! an abstract representation of a directory interface. */
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struct switch_directory_handle {
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/*! the interface of the module that implemented the current directory interface */
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const struct switch_directory_interface *directory_interface;
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/*! flags to control behaviour */
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unsigned int flags;
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/*! the handle's memory pool */
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switch_memory_pool *memory_pool;
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/*! private data for the format module to store handle specific info */
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void *private_info;
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};
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/* nobody has more setting than speex so we will let them set the standard */
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/*! \brief Various codec settings (currently only relevant to speex) */
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struct switch_codec_settings {
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/*! desired quality */
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int quality;
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/*! desired complexity */
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int complexity;
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/*! desired enhancement */
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int enhancement;
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/*! desired vad level */
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int vad;
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/*! desired vbr level */
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int vbr;
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/*! desired vbr quality */
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float vbr_quality;
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/*! desired abr level */
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int abr;
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/*! desired dtx setting */
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int dtx;
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/*! desired preprocessor settings */
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int preproc;
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/*! preprocessor vad settings */
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int pp_vad;
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/*! preprocessor gain control settings */
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int pp_agc;
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/*! preprocessor gain level */
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float pp_agc_level;
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/*! preprocessor denoise level */
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int pp_denoise;
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/*! preprocessor dereverb settings */
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int pp_dereverb;
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/*! preprocessor dereverb decay level */
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float pp_dereverb_decay;
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/*! preprocessor dereverb level */
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float pp_dereverb_level;
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};
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/*! an abstract handle to a codec module */
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struct switch_codec {
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/*! the codec interface table this handle uses */
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const struct switch_codec_interface *codec_interface;
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/*! the specific implementation of the above codec */
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const struct switch_codec_implementation *implementation;
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/*! codec settings for this handle */
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struct switch_codec_settings codec_settings;
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/*! flags to modify behaviour */
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switch_codec_flag flags;
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/*! the handle's memory pool*/
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switch_memory_pool *memory_pool;
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/*! private data for the codec module to store handle specific info */
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void *private_info;
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};
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/*! \brief A table of settings and callbacks that define a paticular implementation of a codec */
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struct switch_codec_implementation {
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/*! samples transferred per second */
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int samples_per_second;
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/*! bits transferred per second */
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int bits_per_second;
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/*! number of microseconds that denote one frame */
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int microseconds_per_frame;
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/*! number of samples that denote one frame */
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int samples_per_frame;
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/*! number of bytes that denote one frame decompressed */
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size_t bytes_per_frame;
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/*! number of bytes that denote one frame compressed */
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int encoded_bytes_per_frame;
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/*! number of channels represented */
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int number_of_channels;
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/*! number of frames to send in one netowrk packet */
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int pref_frames_per_packet;
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/*! max number of frames to send in one network packet */
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int max_frames_per_packet;
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/*! function to initialize a codec handle using this implementation */
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switch_status (*init)(switch_codec *, switch_codec_flag, const switch_codec_settings *codec_settings);
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/*! function to encode raw data into encoded data */
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switch_status (*encode)(switch_codec *codec,
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switch_codec *other_codec,
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void *decoded_data,
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size_t decoded_data_len,
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int decoded_rate,
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void *encoded_data,
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size_t *encoded_data_len,
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int *encoded_rate,
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unsigned int *flag);
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/*! function to decode encoded data into raw data */
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switch_status (*decode)(switch_codec *codec,
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switch_codec *other_codec,
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void *encoded_data,
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size_t encoded_data_len,
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int encoded_rate,
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void *decoded_data,
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size_t *decoded_data_len,
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int *decoded_rate,
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unsigned int *flag);
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/*! deinitalize a codec handle using this implementation */
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switch_status (*destroy)(switch_codec *);
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const struct switch_codec_implementation *next;
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};
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/*! \brief Top level module interface to implement a series of codec implementations */
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struct switch_codec_interface {
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/*! the name of the interface */
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const char *interface_name;
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/*! enumeration defining the type of the codec */
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const switch_codec_type codec_type;
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/*! the IANA code number */
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unsigned int ianacode;
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/*! the IANA code name */
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char *iananame;
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/*! a list of codec implementations related to the codec */
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const switch_codec_implementation *implementations;
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const struct switch_codec_interface *next;
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};
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/*! \brief A module interface to implement an application */
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struct switch_application_interface {
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/*! the name of the interface */
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const char *interface_name;
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/*! function the application implements */
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switch_application_function application_function;
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/*! the long winded description of the application */
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const char *long_desc;
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/*! the short and sweet description of the application */
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const char *short_desc;
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/*! an example of the application syntax */
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const char *syntax;
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const struct switch_application_interface *next;
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};
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/*! \brief A module interface to implement an api function */
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struct switch_api_interface {
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/*! the name of the interface */
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const char *interface_name;
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/*! a description of the api function */
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const char *desc;
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/*! function the api call uses */
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switch_api_function function;
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const struct switch_api_interface *next;
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};
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#ifdef __cplusplus
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}
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#endif
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#endif
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