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font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long *//* * Asterisk -- An open source telephony toolkit. * * Copyright (C) 2007 - 2009, Digium, Inc. * * Joshua Colp * * 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 Channel Bridging API * \author Joshua Colp * \ref AstBridging */ /*! * \page AstBridging Channel Bridging API * * The purpose of this API is to provide an easy and flexible way to bridge * channels of different technologies with different features. * * Bridging technologies provide the mechanism that do the actual handling * of frames between channels. They provide capability information, codec information, * and preference value to assist the bridging core in choosing a bridging technology when * creating a bridge. Different bridges may use different bridging technologies based on needs * but once chosen they all operate under the same premise; they receive frames and send frames. * * Bridges are a combination of bridging technology, channels, and features. A * developer creates a new bridge based on what they are currently expecting to do * with it or what they will do with it in the future. The bridging core determines what * available bridging technology will best fit the requirements and creates a new bridge. * Once created, channels can be added to the bridge in a blocking or non-blocking fashion. * * Features are such things as channel muting or DTMF based features such as attended transfer, * blind transfer, and hangup. Feature information must be set at the most granular level, on * the channel. While you can use features on a global scope the presence of a feature structure * on the channel will override the global scope. An example would be having the bridge muted * at global scope and attended transfer enabled on a channel. Since the channel itself is not muted * it would be able to speak. * * Feature hooks allow a developer to tell the bridging core that when a DTMF string * is received from a channel a callback should be called in their application. For * example, a conference bridge application may want to provide an IVR to control various * settings on the conference bridge. This can be accomplished by attaching a feature hook * that calls an IVR function when a DTMF string is entered. * */ #ifndef _ASTERISK_BRIDGING_H #define _ASTERISK_BRIDGING_H #if defined(__cplusplus) || defined(c_plusplus) extern "C" { #endif #include "asterisk/bridging_features.h" #include "asterisk/dsp.h" /*! \brief Capabilities for a bridge technology */ enum ast_bridge_capability { /*! Bridge is only capable of mixing 2 channels */ AST_BRIDGE_CAPABILITY_1TO1MIX = (1 << 1), /*! Bridge is capable of mixing 2 or more channels */ AST_BRIDGE_CAPABILITY_MULTIMIX = (1 << 2), /*! Bridge should natively bridge two channels if possible */ AST_BRIDGE_CAPABILITY_NATIVE = (1 << 3), /*! Bridge should run using the multithreaded model */ AST_BRIDGE_CAPABILITY_MULTITHREADED = (1 << 4), /*! Bridge should run a central bridge thread */ AST_BRIDGE_CAPABILITY_THREAD = (1 << 5), /*! Bridge technology can do video mixing (or something along those lines) */ AST_BRIDGE_CAPABILITY_VIDEO = (1 << 6), /*! Bridge technology can optimize things based on who is talking */ AST_BRIDGE_CAPABILITY_OPTIMIZE = (1 << 7), }; /*! \brief State information about a bridged channel */ enum ast_bridge_channel_state { /*! Waiting for a signal */ AST_BRIDGE_CHANNEL_STATE_WAIT = 0, /*! Bridged channel has ended itself (it has hung up) */ AST_BRIDGE_CHANNEL_STATE_END, /*! Bridged channel should be hung up */ AST_BRIDGE_CHANNEL_STATE_HANGUP, /*! Bridged channel should be removed from the bridge without being hung up */ AST_BRIDGE_CHANNEL_STATE_DEPART, /*! Bridged channel is executing a feature hook */ AST_BRIDGE_CHANNEL_STATE_FEATURE, /*! Bridged channel is sending a DTMF stream out */ AST_BRIDGE_CHANNEL_STATE_DTMF, /*! Bridged channel began talking */ AST_BRIDGE_CHANNEL_STATE_START_TALKING, /*! Bridged channel has stopped talking */ AST_BRIDGE_CHANNEL_STATE_STOP_TALKING, }; /*! \brief Return values for bridge technology write function */ enum ast_bridge_write_result { /*! Bridge technology wrote out frame fine */ AST_BRIDGE_WRITE_SUCCESS = 0, /*! Bridge technology attempted to write out the frame but failed */ AST_BRIDGE_WRITE_FAILED, /*! Bridge technology does not support writing out a frame of this type */ AST_BRIDGE_WRITE_UNSUPPORTED, }; struct ast_bridge_technology; struct ast_bridge; /*! * \brief Structure specific to bridge technologies capable of * performing talking optimizations. */ struct ast_bridge_tech_optimizations { /*! The amount of time in ms that talking must be detected before * the dsp determines that talking has occurred */ unsigned int talking_threshold; /*! The amount of time in ms that silence must be detected before * the dsp determines that talking has stopped */ unsigned int silence_threshold; /*! Whether or not the bridging technology should drop audio * detected as silence from the mix. */ unsigned int drop_silence:1; }; /*! * \brief Structure that contains information regarding a channel in a bridge */ struct ast_bridge_channel { /*! Lock to protect this data structure */ ast_mutex_t lock; /*! Condition, used if we want to wake up a thread waiting on the bridged channel */ ast_cond_t cond; /*! Current bridged channel state */ enum ast_bridge_channel_state state; /*! Asterisk channel participating in the bridge */ struct ast_channel *chan; /*! Asterisk channel we are swapping with (if swapping) */ struct ast_channel *swap; /*! Bridge this channel is participating in */ struct ast_bridge *bridge; /*! Private information unique to the bridge technology */ void *bridge_pvt; /*! Thread handling the bridged channel */ pthread_t thread; /*! Additional file descriptors to look at */ int fds[4]; /*! Bit to indicate whether the channel is suspended from the bridge or not */ unsigned int suspended:1; /*! Features structure for features that are specific to this channel */ struct ast_bridge_features *features; /*! Technology optimization parameters used by bridging technologies capable of * optimizing based upon talk detection. */ struct ast_bridge_tech_optimizations tech_args; /*! Queue of DTMF digits used for DTMF streaming */ char dtmf_stream_q[8]; /*! Linked list information */ AST_LIST_ENTRY(ast_bridge_channel) entry; }; enum ast_bridge_video_mode_type { /*! Video is not allowed in the bridge */ AST_BRIDGE_VIDEO_MODE_NONE = 0, /*! A single user is picked as the only distributed of video across the bridge */ AST_BRIDGE_VIDEO_MODE_SINGLE_SRC, /*! A single user's video feed is distributed to all bridge channels, but * that feed is automatically picked based on who is talking the most. */ AST_BRIDGE_VIDEO_MODE_TALKER_SRC, }; /*! This is used for both SINGLE_SRC mode to set what channel * should be the current single video feed */ struct ast_bridge_video_single_src_data { /*! Only accept video coming from this channel */ struct ast_channel *chan_vsrc; }; /*! This is used for both SINGLE_SRC_TALKER mode to set what channel * should be the current single video feed */ struct ast_bridge_video_talker_src_data { /*! Only accept video coming from this channel */ struct ast_channel *chan_vsrc; int average_talking_energy; }; struct ast_bridge_video_mode { enum ast_bridge_video_mode_type mode; /* Add data for all the video modes here. */ union { struct ast_bridge_video_single_src_data single_src_data; struct ast_bridge_video_talker_src_data talker_src_data; } mode_data; }; /*! * \brief Structure that contains information about a bridge */ struct ast_bridge { /*! Number of channels participating in the bridge */ int num; /*! The video mode this bridge is using */ struct ast_bridge_video_mode video_mode; /*! The internal sample rate this bridge is mixed at when multiple channels are being mixed. * If this value is 0, the bridge technology may auto adjust the internal mixing rate. */ unsigned int internal_sample_rate; /*! The mixing interval indicates how quickly the bridges internal mixing should occur * for bridge technologies that mix audio. When set to 0, the bridge tech must choose a * default interval for itself. */ unsigned int internal_mixing_interval; /*! Bit to indicate that the bridge thread is waiting on channels in the bridge array */ unsigned int waiting:1; /*! Bit to indicate the bridge thread should stop */ unsigned int stop:1; /*! Bit to indicate the bridge thread should refresh itself */ unsigned int refresh:1; /*! Bridge flags to tweak behavior */ struct ast_flags feature_flags; /*! Bridge technology that is handling the bridge */ struct ast_bridge_technology *technology; /*! Private information unique to the bridge technology */ void *bridge_pvt; /*! Thread running the bridge */ pthread_t thread; /*! Enabled features information */ struct ast_bridge_features features; /*! Array of channels that the bridge thread is currently handling */ struct ast_channel **array; /*! Number of channels in the above array */ size_t array_num; /*! Number of channels the array can handle */ size_t array_size; /*! Linked list of channels participating in the bridge */ AST_LIST_HEAD_NOLOCK(, ast_bridge_channel) channels; }; /*! \brief Create a new bridge * * \param capabilities The capabilities that we require to be used on the bridge * \param flags Flags that will alter the behavior of the bridge * * \retval a pointer to a new bridge on success * \retval NULL on failure * * Example usage: * * \code * struct ast_bridge *bridge; * bridge = ast_bridge_new(AST_BRIDGE_CAPABILITY_1TO1MIX, AST_BRIDGE_FLAG_DISSOLVE); * \endcode * * This creates a simple two party bridge that will be destroyed once one of * the channels hangs up. */ struct ast_bridge *ast_bridge_new(uint32_t capabilities, int flags); /*! \brief See if it is possible to create a bridge * * \param capabilities The capabilities that the bridge will use * * \retval 1 if possible * \retval 0 if not possible * * Example usage: * * \code * int possible = ast_bridge_check(AST_BRIDGE_CAPABILITY_1TO1MIX); * \endcode * * This sees if it is possible to create a bridge capable of bridging two channels * together. */ int ast_bridge_check(uint32_t capabilities); /*! \brief Destroy a bridge * * \param bridge Bridge to destroy * * \retval 0 on success * \retval -1 on failure * * Example usage: * * \code * ast_bridge_destroy(bridge); * \endcode * * This destroys a bridge that was previously created using ast_bridge_new. */ int ast_bridge_destroy(struct ast_bridge *bridge); /*! \brief Join (blocking) a channel to a bridge * * \param bridge Bridge to join * \param chan Channel to join * \param swap Channel to swap out if swapping * \param features Bridge features structure * \param (Optional) Bridging tech optimization parameters for this channel. * * \retval state that channel exited the bridge with * * Example usage: * * \code * ast_bridge_join(bridge, chan, NULL, NULL); * \endcode * * This adds a channel pointed to by the chan pointer to the bridge pointed to by * the bridge pointer. This function will not return until the channel has been * removed from the bridge, swapped out for another channel, or has hung up. * * If this channel will be replacing another channel the other channel can be specified * in the swap parameter. The other channel will be thrown out of the bridge in an * atomic fashion. * * If channel specific features are enabled a pointer to the features structure * can be specified in the features parameter. */ enum ast_bridge_channel_state ast_bridge_join(struct ast_bridge *bridge, struct ast_channel *chan, struct ast_channel *swap, struct ast_bridge_features *features, struct ast_bridge_tech_optimizations *tech_args); /*! \brief Impart (non-blocking) a channel on a bridge * * \param bridge Bridge to impart on * \param chan Channel to impart * \param swap Channel to swap out if swapping * \param features Bridge features structure * * \retval 0 on success * \retval -1 on failure * * Example usage: * * \code * ast_bridge_impart(bridge, chan, NULL, NULL); * \endcode * * This adds a channel pointed to by the chan pointer to the bridge pointed to by * the bridge pointer. This function will return immediately and will not wait * until the channel is no longer part of the bridge. * * If this channel will be replacing another channel the other channel can be specified * in the swap parameter. The other channel will be thrown out of the bridge in an * atomic fashion. * * If channel specific features are enabled a pointer to the features structure * can be specified in the features parameter. */ int ast_bridge_impart(struct ast_bridge *bridge, struct ast_channel *chan, struct ast_channel *swap, struct ast_bridge_features *features); /*! \brief Depart a channel from a bridge * * \param bridge Bridge to depart from * \param chan Channel to depart * * \retval 0 on success * \retval -1 on failure * * Example usage: * * \code * ast_bridge_depart(bridge, chan); * \endcode * * This removes the channel pointed to by the chan pointer from the bridge * pointed to by the bridge pointer and gives control to the calling thread. * This does not hang up the channel. * * \note This API call can only be used on channels that were added to the bridge * using the ast_bridge_impart API call. */ int ast_bridge_depart(struct ast_bridge *bridge, struct ast_channel *chan); /*! \brief Remove a channel from a bridge * * \param bridge Bridge that the channel is to be removed from * \param chan Channel to remove * * \retval 0 on success * \retval -1 on failure * * Example usage: * * \code * ast_bridge_remove(bridge, chan); * \endcode * * This removes the channel pointed to by the chan pointer from the bridge * pointed to by the bridge pointer and requests that it be hung up. Control * over the channel will NOT be given to the calling thread. * * \note This API call can be used on channels that were added to the bridge * using both ast_bridge_join and ast_bridge_impart. */ int ast_bridge_remove(struct ast_bridge *bridge, struct ast_channel *chan); /*! \brief Merge two bridges together * * \param bridge0 First bridge * \param bridge1 Second bridge * * \retval 0 on success * \retval -1 on failure * * Example usage: * * \code * ast_bridge_merge(bridge0, bridge1); * \endcode * * This merges the bridge pointed to by bridge1 with the bridge pointed to by bridge0. * In reality all of the channels in bridge1 are simply moved to bridge0. * * \note The second bridge specified is not destroyed when this operation is * completed. */ int ast_bridge_merge(struct ast_bridge *bridge0, struct ast_bridge *bridge1); /*! \brief Suspend a channel temporarily from a bridge * * \param bridge Bridge to suspend the channel from * \param chan Channel to suspend * * \retval 0 on success * \retval -1 on failure * * Example usage: * * \code * ast_bridge_suspend(bridge, chan); * \endcode * * This suspends the channel pointed to by chan from the bridge pointed to by bridge temporarily. * Control of the channel is given to the calling thread. This differs from ast_bridge_depart as * the channel will not be removed from the bridge. * * \note This API call can be used on channels that were added to the bridge * using both ast_bridge_join and ast_bridge_impart. */ int ast_bridge_suspend(struct ast_bridge *bridge, struct ast_channel *chan); /*! \brief Unsuspend a channel from a bridge * * \param bridge Bridge to unsuspend the channel from * \param chan Channel to unsuspend * * \retval 0 on success * \retval -1 on failure * * Example usage: * * \code * ast_bridge_unsuspend(bridge, chan); * \endcode * * This unsuspends the channel pointed to by chan from the bridge pointed to by bridge. * The bridge will go back to handling the channel once this function returns. * * \note You must not mess with the channel once this function returns. * Doing so may result in bad things happening. */ int ast_bridge_unsuspend(struct ast_bridge *bridge, struct ast_channel *chan); /*! \brief Change the state of a bridged channel * * \param bridge_channel Channel to change the state on * \param new_state The new state to place the channel into * * Example usage: * * \code * ast_bridge_change_state(bridge_channel, AST_BRIDGE_CHANNEL_STATE_WAIT); * \endcode * * This places the channel pointed to by bridge_channel into the state * AST_BRIDGE_CHANNEL_STATE_WAIT. * * \note This API call is only meant to be used in feature hook callbacks to * make sure the channel either hangs up or returns to the bridge. */ void ast_bridge_change_state(struct ast_bridge_channel *bridge_channel, enum ast_bridge_channel_state new_state); /*! \brief Adjust the internal mixing sample rate of a bridge used during * multimix mode. * * \param bridge_channel Channel to change the sample rate on. * \param sample rate, the sample rate to change to. If a * value of 0 is passed here, the bridge will be free to pick * what ever sample rate it chooses. * */ void ast_bridge_set_internal_sample_rate(struct ast_bridge *bridge, unsigned int sample_rate); /*! \brief Adjust the internal mixing interval of a bridge used during * multimix mode. * * \param bridge_channel Channel to change the sample rate on. * \param mixing_interval, the sample rate to change to. If 0 is set * the bridge tech is free to choose any mixing interval it uses by default. */ void ast_bridge_set_mixing_interval(struct ast_bridge *bridge, unsigned int mixing_interval); /*! * \brief Set a bridge to feed a single video source to all participants. */ void ast_bridge_set_single_src_video_mode(struct ast_bridge *bridge, struct ast_channel *video_src_chan); /*! * \brief Set the bridge to pick the strongest talker supporting * video as the single source video feed */ void ast_bridge_set_talker_src_video_mode(struct ast_bridge *bridge); /*! * \brief Update information about talker energy for talker src video mode. */ void ast_bridge_update_talker_src_video_mode(struct ast_bridge *bridge, struct ast_channel *chan, int talker_energy, int is_keyfame); /*! * \brief Determine if a channel is a video src for the bridge */ int ast_bridge_is_video_src(struct ast_bridge *bridge, struct ast_channel *chan); /*! * \brief remove a channel as a source of video for the bridge. */ void ast_bridge_remove_video_src(struct ast_bridge *bridge, struct ast_channel *chan); #if defined(__cplusplus) || defined(c_plusplus) } #endif #endif /* _ASTERISK_BRIDGING_H */