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Diffstat (limited to 'include/asterisk/audiohook.h')
| -rw-r--r-- | include/asterisk/audiohook.h | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/include/asterisk/audiohook.h b/include/asterisk/audiohook.h new file mode 100644 index 000000000..8839cbde4 --- /dev/null +++ b/include/asterisk/audiohook.h @@ -0,0 +1,211 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Copyright (C) 1999 - 2007, Digium, Inc. + * + * Joshua Colp <jcolp@digium.com> + * + * See http://www.asterisk.org for more information about + * the Asterisk project. Please do not directly contact + * any of the maintainers of this project for assistance; + * the project provides a web site, mailing lists and IRC + * channels for your use. + * + * This program is free software, distributed under the terms of + * the GNU General Public License Version 2. See the LICENSE file + * at the top of the source tree. + */ + +/*! \file + * \brief Audiohooks Architecture + */ + +#ifndef _ASTERISK_AUDIOHOOK_H +#define _ASTERISK_AUDIOHOOK_H + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#include "asterisk/slinfactory.h" + +enum ast_audiohook_type { + AST_AUDIOHOOK_TYPE_SPY = 0, /*!< Audiohook wants to receive audio */ + AST_AUDIOHOOK_TYPE_WHISPER, /*!< Audiohook wants to provide audio to be mixed with existing audio */ + AST_AUDIOHOOK_TYPE_MANIPULATE, /*!< Audiohook wants to manipulate the audio */ +}; + +enum ast_audiohook_status { + AST_AUDIOHOOK_STATUS_NEW = 0, /*!< Audiohook was just created, not in use yet */ + AST_AUDIOHOOK_STATUS_RUNNING, /*!< Audiohook is running on a channel */ + AST_AUDIOHOOK_STATUS_SHUTDOWN, /*!< Audiohook is being shutdown */ + AST_AUDIOHOOK_STATUS_DONE, /*!< Audiohook has shutdown and is not running on a channel any longer */ +}; + +enum ast_audiohook_direction { + AST_AUDIOHOOK_DIRECTION_READ = 0, /*!< Reading audio in */ + AST_AUDIOHOOK_DIRECTION_WRITE, /*!< Writing audio out */ + AST_AUDIOHOOK_DIRECTION_BOTH, /*!< Both reading audio in and writing audio out */ +}; + +enum ast_audiohook_flags { + AST_AUDIOHOOK_TRIGGER_MODE = (3 << 0), /*!< When audiohook should be triggered to do something */ + AST_AUDIOHOOK_TRIGGER_READ = (1 << 0), /*!< Audiohook wants to be triggered when reading audio in */ + AST_AUDIOHOOK_TRIGGER_WRITE = (2 << 0), /*!< Audiohook wants to be triggered when writing audio out */ + AST_AUDIOHOOK_WANTS_DTMF = (1 << 1), /*!< Audiohook also wants to receive DTMF frames */ + AST_AUDIOHOOK_TRIGGER_SYNC = (1 << 2), /*!< Audiohook wants to be triggered when both sides have combined audio available */ +}; + +#define AST_AUDIOHOOK_SYNC_TOLERANCE 100 /*< Tolerance in milliseconds for audiohooks synchronization */ + +struct ast_audiohook; + +/*! \brief Callback function for manipulate audiohook type + * \param audiohook Audiohook structure + * \param chan Channel + * \param frame Frame of audio to manipulate + * \param direction Direction frame came from + * \return Returns 0 on success, -1 on failure + * \note An audiohook does not have any reference to a private data structure for manipulate types. It is up to the manipulate callback to store this data + * via it's own method. An example would be datastores. + */ +typedef int (*ast_audiohook_manipulate_callback)(struct ast_audiohook *audiohook, struct ast_channel *chan, struct ast_frame *frame, enum ast_audiohook_direction direction); + +struct ast_audiohook_options { + int read_volume; /*!< Volume adjustment on frames read from the channel the hook is on */ + int write_volume; /*!< Volume adjustment on frames written to the channel the hook is on */ +}; + +struct ast_audiohook { + ast_mutex_t lock; /*!< Lock that protects the audiohook structure */ + ast_cond_t trigger; /*!< Trigger condition (if enabled) */ + enum ast_audiohook_type type; /*!< Type of audiohook */ + enum ast_audiohook_status status; /*!< Status of the audiohook */ + const char *source; /*!< Who this audiohook ultimately belongs to */ + unsigned int flags; /*!< Flags on the audiohook */ + struct ast_slinfactory read_factory; /*!< Factory where frames read from the channel, or read from the whisper source will go through */ + struct ast_slinfactory write_factory; /*!< Factory where frames written to the channel will go through */ + struct timeval read_time; /*!< Last time read factory was fed */ + struct timeval write_time; /*!< Last time write factory was fed */ + int format; /*!< Format translation path is setup as */ + struct ast_trans_pvt *trans_pvt; /*!< Translation path for reading frames */ + ast_audiohook_manipulate_callback manipulate_callback; /*!< Manipulation callback */ + struct ast_audiohook_options options; /*!< Applicable options */ + AST_LIST_ENTRY(ast_audiohook) list; /*!< Linked list information */ +}; + +struct ast_audiohook_list; + +/*! \brief Initialize an audiohook structure + * \param audiohook Audiohook structure + * \param type Type of audiohook to initialize this as + * \param source Who is initializing this audiohook + * \return Returns 0 on success, -1 on failure + */ +int ast_audiohook_init(struct ast_audiohook *audiohook, enum ast_audiohook_type type, const char *source); + +/*! \brief Destroys an audiohook structure + * \param audiohook Audiohook structure + * \return Returns 0 on success, -1 on failure + */ +int ast_audiohook_destroy(struct ast_audiohook *audiohook); + +/*! \brief Writes a frame into the audiohook structure + * \param audiohook Audiohook structure + * \param direction Direction the audio frame came from + * \param frame Frame to write in + * \return Returns 0 on success, -1 on failure + */ +int ast_audiohook_write_frame(struct ast_audiohook *audiohook, enum ast_audiohook_direction direction, struct ast_frame *frame); + +/*! \brief Reads a frame in from the audiohook structure + * \param audiohook Audiohook structure + * \param samples Number of samples wanted + * \param direction Direction the audio frame came from + * \param format Format of frame remote side wants back + * \return Returns frame on success, NULL on failure + */ +struct ast_frame *ast_audiohook_read_frame(struct ast_audiohook *audiohook, size_t samples, enum ast_audiohook_direction direction, int format); + +/*! \brief Attach audiohook to channel + * \param chan Channel + * \param audiohook Audiohook structure + * \return Returns 0 on success, -1 on failure + */ +int ast_audiohook_attach(struct ast_channel *chan, struct ast_audiohook *audiohook); + +/*! \brief Detach audiohook from channel + * \param audiohook Audiohook structure + * \return Returns 0 on success, -1 on failure + */ +int ast_audiohook_detach(struct ast_audiohook *audiohook); + +/*! \brief Detach audiohooks from list and destroy said list + * \param audiohook_list List of audiohooks + * \return Returns 0 on success, -1 on failure + */ +int ast_audiohook_detach_list(struct ast_audiohook_list *audiohook_list); + +/*! \brief Move an audiohook from one channel to a new one + * + * \todo Currently only the first audiohook of a specific source found will be moved. + * We should add the capability to move multiple audiohooks from a single source as well. + * + * \note It is required that both old_chan and new_chan are locked prior to calling + * this function. Besides needing to protect the data within the channels, not locking + * these channels can lead to a potential deadlock + * + * \param old_chan The source of the audiohook to move + * \param new_chan The destination to which we want the audiohook to move + * \param source The source of the audiohook we want to move + */ +void ast_audiohook_move_by_source(struct ast_channel *old_chan, struct ast_channel *new_chan, const char *source); + +/*! \brief Detach specified source audiohook from channel + * \param chan Channel to detach from + * \param source Name of source to detach + * \return Returns 0 on success, -1 on failure + */ +int ast_audiohook_detach_source(struct ast_channel *chan, const char *source); + +/*! + * \brief Remove an audiohook from a specified channel + * + * \param chan Channel to remove from + * \param audiohook Audiohook to remove + * + * \return Returns 0 on success, -1 on failure + * + * \note The channel does not need to be locked before calling this function + */ +int ast_audiohook_remove(struct ast_channel *chan, struct ast_audiohook *audiohook); + +/*! \brief Pass a frame off to be handled by the audiohook core + * \param chan Channel that the list is coming off of + * \param audiohook_list List of audiohooks + * \param direction Direction frame is coming in from + * \param frame The frame itself + * \return Return frame on success, NULL on failure + */ +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); + +/*! \brief Wait for audiohook trigger to be triggered + * \param audiohook Audiohook to wait on + */ +void ast_audiohook_trigger_wait(struct ast_audiohook *audiohook); + +/*! \brief Lock an audiohook + * \param ah Audiohook structure + */ +#define ast_audiohook_lock(ah) ast_mutex_lock(&(ah)->lock) + +/*! \brief Unlock an audiohook + * \param ah Audiohook structure + */ +#define ast_audiohook_unlock(ah) ast_mutex_unlock(&(ah)->lock) + +#if defined(__cplusplus) || defined(c_plusplus) +} +#endif + +#endif /* _ASTERISK_AUDIOHOOK_H */ |