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https://github.com/servalproject/serval-dna.git
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601ca12499
Re-ported for asterisk module.
230 lines
9.8 KiB
C
230 lines
9.8 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2007, Digium, Inc.
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*
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* Joshua Colp <jcolp@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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* \brief Audiohooks Architecture
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*/
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#ifndef _ASTERISK_AUDIOHOOK_H
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#define _ASTERISK_AUDIOHOOK_H
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#include "asterisk/slinfactory.h"
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enum ast_audiohook_type {
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AST_AUDIOHOOK_TYPE_SPY = 0, /*!< Audiohook wants to receive audio */
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AST_AUDIOHOOK_TYPE_WHISPER, /*!< Audiohook wants to provide audio to be mixed with existing audio */
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AST_AUDIOHOOK_TYPE_MANIPULATE, /*!< Audiohook wants to manipulate the audio */
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};
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enum ast_audiohook_status {
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AST_AUDIOHOOK_STATUS_NEW = 0, /*!< Audiohook was just created, not in use yet */
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AST_AUDIOHOOK_STATUS_RUNNING, /*!< Audiohook is running on a channel */
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AST_AUDIOHOOK_STATUS_SHUTDOWN, /*!< Audiohook is being shutdown */
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AST_AUDIOHOOK_STATUS_DONE, /*!< Audiohook has shutdown and is not running on a channel any longer */
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};
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enum ast_audiohook_direction {
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AST_AUDIOHOOK_DIRECTION_READ = 0, /*!< Reading audio in */
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AST_AUDIOHOOK_DIRECTION_WRITE, /*!< Writing audio out */
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AST_AUDIOHOOK_DIRECTION_BOTH, /*!< Both reading audio in and writing audio out */
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};
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enum ast_audiohook_flags {
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AST_AUDIOHOOK_TRIGGER_MODE = (3 << 0), /*!< When audiohook should be triggered to do something */
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AST_AUDIOHOOK_TRIGGER_READ = (1 << 0), /*!< Audiohook wants to be triggered when reading audio in */
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AST_AUDIOHOOK_TRIGGER_WRITE = (2 << 0), /*!< Audiohook wants to be triggered when writing audio out */
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AST_AUDIOHOOK_WANTS_DTMF = (1 << 1), /*!< Audiohook also wants to receive DTMF frames */
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AST_AUDIOHOOK_TRIGGER_SYNC = (1 << 2), /*!< Audiohook wants to be triggered when both sides have combined audio available */
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/*! Audiohooks with this flag set will not allow for a large amount of samples to build up on its
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* slinfactories. We will flush the factories if they contain too many samples.
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*/
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AST_AUDIOHOOK_SMALL_QUEUE = (1 << 3),
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};
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#define AST_AUDIOHOOK_SYNC_TOLERANCE 100 /*< Tolerance in milliseconds for audiohooks synchronization */
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struct ast_audiohook;
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/*! \brief Callback function for manipulate audiohook type
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* \param audiohook Audiohook structure
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* \param chan Channel
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* \param frame Frame of audio to manipulate
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* \param direction Direction frame came from
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* \return Returns 0 on success, -1 on failure.
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* \note An audiohook does not have any reference to a private data structure for manipulate
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* types. It is up to the manipulate callback to store this data via it's own method.
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* An example would be datastores.
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* \note The input frame should never be freed or corrupted during a manipulate callback.
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* If the callback has the potential to corrupt the frame's data during manipulation,
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* local data should be used for the manipulation and only copied to the frame on
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* success.
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* \note A failure return value indicates that the frame was not manipulated and that
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* is being returned in its original state.
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*/
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typedef int (*ast_audiohook_manipulate_callback)(struct ast_audiohook *audiohook, struct ast_channel *chan, struct ast_frame *frame, enum ast_audiohook_direction direction);
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struct ast_audiohook_options {
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int read_volume; /*!< Volume adjustment on frames read from the channel the hook is on */
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int write_volume; /*!< Volume adjustment on frames written to the channel the hook is on */
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};
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struct ast_audiohook {
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ast_mutex_t lock; /*!< Lock that protects the audiohook structure */
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ast_cond_t trigger; /*!< Trigger condition (if enabled) */
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enum ast_audiohook_type type; /*!< Type of audiohook */
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enum ast_audiohook_status status; /*!< Status of the audiohook */
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const char *source; /*!< Who this audiohook ultimately belongs to */
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unsigned int flags; /*!< Flags on the audiohook */
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struct ast_slinfactory read_factory; /*!< Factory where frames read from the channel, or read from the whisper source will go through */
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struct ast_slinfactory write_factory; /*!< Factory where frames written to the channel will go through */
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struct timeval read_time; /*!< Last time read factory was fed */
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struct timeval write_time; /*!< Last time write factory was fed */
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int format; /*!< Format translation path is setup as */
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struct ast_trans_pvt *trans_pvt; /*!< Translation path for reading frames */
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ast_audiohook_manipulate_callback manipulate_callback; /*!< Manipulation callback */
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struct ast_audiohook_options options; /*!< Applicable options */
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AST_LIST_ENTRY(ast_audiohook) list; /*!< Linked list information */
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};
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struct ast_audiohook_list;
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/*! \brief Initialize an audiohook structure
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* \param audiohook Audiohook structure
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* \param type Type of audiohook to initialize this as
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* \param source Who is initializing this audiohook
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* \return Returns 0 on success, -1 on failure
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*/
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int ast_audiohook_init(struct ast_audiohook *audiohook, enum ast_audiohook_type type, const char *source);
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/*! \brief Destroys an audiohook structure
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* \param audiohook Audiohook structure
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* \return Returns 0 on success, -1 on failure
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*/
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int ast_audiohook_destroy(struct ast_audiohook *audiohook);
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/*! \brief Writes a frame into the audiohook structure
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* \param audiohook Audiohook structure
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* \param direction Direction the audio frame came from
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* \param frame Frame to write in
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* \return Returns 0 on success, -1 on failure
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*/
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int ast_audiohook_write_frame(struct ast_audiohook *audiohook, enum ast_audiohook_direction direction, struct ast_frame *frame);
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/*! \brief Reads a frame in from the audiohook structure
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* \param audiohook Audiohook structure
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* \param samples Number of samples wanted
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* \param direction Direction the audio frame came from
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* \param format Format of frame remote side wants back
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* \return Returns frame on success, NULL on failure
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*/
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struct ast_frame *ast_audiohook_read_frame(struct ast_audiohook *audiohook, size_t samples, enum ast_audiohook_direction direction, int format);
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/*! \brief Attach audiohook to channel
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* \param chan Channel
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* \param audiohook Audiohook structure
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* \return Returns 0 on success, -1 on failure
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*/
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int ast_audiohook_attach(struct ast_channel *chan, struct ast_audiohook *audiohook);
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/*! \brief Detach audiohook from channel
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* \param audiohook Audiohook structure
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* \return Returns 0 on success, -1 on failure
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*/
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int ast_audiohook_detach(struct ast_audiohook *audiohook);
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/*! \brief Detach audiohooks from list and destroy said list
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* \param audiohook_list List of audiohooks
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* \return Returns 0 on success, -1 on failure
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*/
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int ast_audiohook_detach_list(struct ast_audiohook_list *audiohook_list);
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/*! \brief Move an audiohook from one channel to a new one
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*
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* \todo Currently only the first audiohook of a specific source found will be moved.
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* We should add the capability to move multiple audiohooks from a single source as well.
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*
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* \note It is required that both old_chan and new_chan are locked prior to calling
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* this function. Besides needing to protect the data within the channels, not locking
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* these channels can lead to a potential deadlock
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*
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* \param old_chan The source of the audiohook to move
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* \param new_chan The destination to which we want the audiohook to move
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* \param source The source of the audiohook we want to move
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*/
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void ast_audiohook_move_by_source(struct ast_channel *old_chan, struct ast_channel *new_chan, const char *source);
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/*! \brief Detach specified source audiohook from channel
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* \param chan Channel to detach from
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* \param source Name of source to detach
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* \return Returns 0 on success, -1 on failure
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*/
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int ast_audiohook_detach_source(struct ast_channel *chan, const char *source);
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/*!
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* \brief Remove an audiohook from a specified channel
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*
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* \param chan Channel to remove from
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* \param audiohook Audiohook to remove
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*
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* \return Returns 0 on success, -1 on failure
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*
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* \note The channel does not need to be locked before calling this function
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*/
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int ast_audiohook_remove(struct ast_channel *chan, struct ast_audiohook *audiohook);
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/*!
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* \brief determines if a audiohook_list is empty or not.
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*
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* retval 0 false, 1 true
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*/
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int ast_audiohook_write_list_empty(struct ast_audiohook_list *audiohook_list);
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/*! \brief Pass a frame off to be handled by the audiohook core
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* \param chan Channel that the list is coming off of
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* \param audiohook_list List of audiohooks
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* \param direction Direction frame is coming in from
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* \param frame The frame itself
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* \return Return frame on success, NULL on failure
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*/
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struct ast_frame *ast_audiohook_write_list(struct ast_channel *chan, struct ast_audiohook_list *audiohook_list, enum ast_audiohook_direction direction, struct ast_frame *frame);
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/*! \brief Wait for audiohook trigger to be triggered
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* \param audiohook Audiohook to wait on
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*/
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void ast_audiohook_trigger_wait(struct ast_audiohook *audiohook);
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/*! \brief Lock an audiohook
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* \param ah Audiohook structure
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*/
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#define ast_audiohook_lock(ah) ast_mutex_lock(&(ah)->lock)
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/*! \brief Unlock an audiohook
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* \param ah Audiohook structure
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*/
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#define ast_audiohook_unlock(ah) ast_mutex_unlock(&(ah)->lock)
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#endif /* _ASTERISK_AUDIOHOOK_H */
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