include/asterisk/audiohook.h

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2007, Digium, Inc.
   5  *
   6  * Joshua Colp <jcolp@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  * \brief Audiohooks Architecture
  21  */
  22
  23 #ifndef _ASTERISK_AUDIOHOOK_H
  24 #define _ASTERISK_AUDIOHOOK_H
  25
  26 #if defined(__cplusplus) || defined(c_plusplus)
  27 extern "C" {
  28 #endif
  29
  30 #include "asterisk/slinfactory.h"
  31
  32 enum ast_audiohook_type {
  33         AST_AUDIOHOOK_TYPE_SPY = 0,    /*!< Audiohook wants to receive audio */
  34         AST_AUDIOHOOK_TYPE_WHISPER,    /*!< Audiohook wants to provide audio to be mixed with existing audio */
  35         AST_AUDIOHOOK_TYPE_MANIPULATE, /*!< Audiohook wants to manipulate the audio */
  36 };
  37
  38 enum ast_audiohook_status {
  39         AST_AUDIOHOOK_STATUS_NEW = 0,  /*!< Audiohook was just created, not in use yet */
  40         AST_AUDIOHOOK_STATUS_RUNNING,  /*!< Audiohook is running on a channel */
  41         AST_AUDIOHOOK_STATUS_SHUTDOWN, /*!< Audiohook is being shutdown */
  42         AST_AUDIOHOOK_STATUS_DONE,     /*!< Audiohook has shutdown and is not running on a channel any longer */
  43 };
  44
  45 enum ast_audiohook_direction {
  46         AST_AUDIOHOOK_DIRECTION_READ = 0, /*!< Reading audio in */
  47         AST_AUDIOHOOK_DIRECTION_WRITE,    /*!< Writing audio out */
  48         AST_AUDIOHOOK_DIRECTION_BOTH,     /*!< Both reading audio in and writing audio out */
  49 };
  50
  51 enum ast_audiohook_flags {
  52         AST_AUDIOHOOK_TRIGGER_MODE = (3 << 0),  /*!< When audiohook should be triggered to do something */
  53         AST_AUDIOHOOK_TRIGGER_READ = (1 << 0),  /*!< Audiohook wants to be triggered when reading audio in */
  54         AST_AUDIOHOOK_TRIGGER_WRITE = (2 << 0), /*!< Audiohook wants to be triggered when writing audio out */
  55         AST_AUDIOHOOK_WANTS_DTMF = (1 << 1),    /*!< Audiohook also wants to receive DTMF frames */
  56         AST_AUDIOHOOK_TRIGGER_SYNC = (1 << 2),  /*!< Audiohook wants to be triggered when both sides have combined audio available */
  57 };
  58
  59 struct ast_audiohook;
  60
  61 /*! \brief Callback function for manipulate audiohook type
  62  * \param audiohook Audiohook structure
  63  * \param chan Channel
  64  * \param frame Frame of audio to manipulate
  65  * \param direction Direction frame came from
  66  * \return Returns 0 on success, -1 on failure
  67  * \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
  68  *       via it's own method. An example would be datastores.
  69  */
  70 typedef int (*ast_audiohook_manipulate_callback)(struct ast_audiohook *audiohook, struct ast_channel *chan, struct ast_frame *frame, enum ast_audiohook_direction direction);
  71
  72 struct ast_audiohook_options {
  73         int read_volume;  /*!< Volume adjustment on frames read from the channel the hook is on */
  74         int write_volume; /*!< Volume adjustment on frames written to the channel the hook is on */
  75 };
  76
  77 struct ast_audiohook {
  78         ast_mutex_t lock;                                      /*!< Lock that protects the audiohook structure */
  79         ast_cond_t trigger;                                    /*!< Trigger condition (if enabled) */
  80         enum ast_audiohook_type type;                          /*!< Type of audiohook */
  81         enum ast_audiohook_status status;                      /*!< Status of the audiohook */
  82         const char *source;                                    /*!< Who this audiohook ultimately belongs to */
  83         unsigned int flags;                                    /*!< Flags on the audiohook */
  84         struct ast_slinfactory read_factory;                   /*!< Factory where frames read from the channel, or read from the whisper source will go through */
  85         struct ast_slinfactory write_factory;                  /*!< Factory where frames written to the channel will go through */
  86         struct timeval read_time;                              /*!< Last time read factory was fed */
  87         struct timeval write_time;                             /*!< Last time write factory was fed */
  88         int format;                                            /*!< Format translation path is setup as */
  89         struct ast_trans_pvt *trans_pvt;                       /*!< Translation path for reading frames */
  90         ast_audiohook_manipulate_callback manipulate_callback; /*!< Manipulation callback */
  91         struct ast_audiohook_options options;                  /*!< Applicable options */
  92         AST_LIST_ENTRY(ast_audiohook) list;                    /*!< Linked list information */
  93 };
  94
  95 struct ast_audiohook_list;
  96
  97 /*! \brief Initialize an audiohook structure
  98  * \param audiohook Audiohook structure
  99  * \param type Type of audiohook to initialize this as
 100  * \param source Who is initializing this audiohook
 101  * \return Returns 0 on success, -1 on failure
 102  */
 103 int ast_audiohook_init(struct ast_audiohook *audiohook, enum ast_audiohook_type type, const char *source);
 104
 105 /*! \brief Destroys an audiohook structure
 106  * \param audiohook Audiohook structure
 107  * \return Returns 0 on success, -1 on failure
 108  */
 109 int ast_audiohook_destroy(struct ast_audiohook *audiohook);
 110
 111 /*! \brief Writes a frame into the audiohook structure
 112  * \param audiohook Audiohook structure
 113  * \param direction Direction the audio frame came from
 114  * \param frame Frame to write in
 115  * \return Returns 0 on success, -1 on failure
 116  */
 117 int ast_audiohook_write_frame(struct ast_audiohook *audiohook, enum ast_audiohook_direction direction, struct ast_frame *frame);
 118
 119 /*! \brief Reads a frame in from the audiohook structure
 120  * \param audiohook Audiohook structure
 121  * \param samples Number of samples wanted
 122  * \param direction Direction the audio frame came from
 123  * \param format Format of frame remote side wants back
 124  * \return Returns frame on success, NULL on failure
 125  */
 126 struct ast_frame *ast_audiohook_read_frame(struct ast_audiohook *audiohook, size_t samples, enum ast_audiohook_direction direction, int format);
 127
 128 /*! \brief Attach audiohook to channel
 129  * \param chan Channel
 130  * \param audiohook Audiohook structure
 131  * \return Returns 0 on success, -1 on failure
 132  */
 133 int ast_audiohook_attach(struct ast_channel *chan, struct ast_audiohook *audiohook);
 134
 135 /*! \brief Detach audiohook from channel
 136  * \param audiohook Audiohook structure
 137  * \return Returns 0 on success, -1 on failure
 138  */
 139 int ast_audiohook_detach(struct ast_audiohook *audiohook);
 140
 141 /*! \brief Detach audiohooks from list and destroy said list
 142  * \param audiohook_list List of audiohooks
 143  * \return Returns 0 on success, -1 on failure
 144  */
 145 int ast_audiohook_detach_list(struct ast_audiohook_list *audiohook_list);
 146
 147 /*! \brief Detach specified source audiohook from channel
 148  * \param chan Channel to detach from
 149  * \param source Name of source to detach
 150  * \return Returns 0 on success, -1 on failure
 151  */
 152 int ast_audiohook_detach_source(struct ast_channel *chan, const char *source);
 153
 154 /*! \brief Pass a frame off to be handled by the audiohook core
 155  * \param chan Channel that the list is coming off of
 156  * \param audiohook_list List of audiohooks
 157  * \param direction Direction frame is coming in from
 158  * \param frame The frame itself
 159  * \return Return frame on success, NULL on failure
 160  */
 161 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);
 162
 163 /*! \brief Wait for audiohook trigger to be triggered
 164  * \param audiohook Audiohook to wait on
 165  */
 166 void ast_audiohook_trigger_wait(struct ast_audiohook *audiohook);
 167
 168 /*! \brief Lock an audiohook
 169  * \param ah Audiohook structure
 170  */
 171 #define ast_audiohook_lock(ah) ast_mutex_lock(&(ah)->lock)
 172
 173 /*! \brief Unlock an audiohook
 174  * \param ah Audiohook structure
 175  */
 176 #define ast_audiohook_unlock(ah) ast_mutex_unlock(&(ah)->lock)
 177
 178 #if defined(__cplusplus) || defined(c_plusplus)
 179 }
 180 #endif
 181
 182 #endif /* _ASTERISK_AUDIOHOOK_H */