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22 * @file include/gnunet_conversation_service.h
23 * @brief API to the conversation service
24 * @author Simon Dieterle
25 * @author Andreas Fuchs
26 * @author Christian Grothoff
29 * NOTE: This API is deliberately deceptively simple; the idea
30 * is that advanced features (such as answering machines) will
31 * be done with a separate service (an answering machine service)
32 * with its own APIs; the speaker/microphone abstractions are
33 * used to facilitate plugging in custom logic for implementing
34 * such a service later by creating "software" versions of
35 * speakers and microphones that record to disk or play a file.
36 * Notifications about missed calls should similarly be done
37 * using a separate service; CONVERSATION is supposed to be just
38 * the "bare bones" voice service.
40 * As this is supposed to be a "secure" service, caller ID is of
41 * course provided as part of the basic implementation, as only the
42 * CONVERSATION service can know for sure who it is that we are
45 #ifndef GNUNET_CONVERSATION_SERVICE_H
46 #define GNUNET_CONVERSATION_SERVICE_H
51 #if 0 /* keep Emacsens' auto-indent happy */
56 #include "gnunet_util_lib.h"
57 #include "gnunet_identity_service.h"
58 #include "gnunet_namestore_service.h"
59 #include "gnunet_speaker_lib.h"
60 #include "gnunet_microphone_lib.h"
64 * Version of the conversation API.
66 #define GNUNET_CONVERSATION_VERSION 0x00000003
69 * Handle to identify a particular caller. A caller is an entity that
70 * initiate a call to a phone. This struct identifies the caller to
71 * the user operating the phone. The entity that initiated the call
72 * will have a `struct GNUNET_CONVERSATION_Call`.
74 struct GNUNET_CONVERSATION_Caller;
77 GNUNET_NETWORK_STRUCT_BEGIN
80 * A phone record specifies which peer is hosting a given user and
81 * may also specify the phone line that is used (typically zero).
82 * The version is also right now always zero.
84 struct GNUNET_CONVERSATION_PhoneRecord
88 * Version of the phone record, for now always zero. We may
89 * use other versions for anonymously hosted phone lines in
92 uint32_t version GNUNET_PACKED;
95 * Phone line to use at the peer.
97 uint32_t line GNUNET_PACKED;
100 * Identity of the peer hosting the phone service.
102 struct GNUNET_PeerIdentity peer;
106 GNUNET_NETWORK_STRUCT_END
109 * Information about active callers to a phone.
111 enum GNUNET_CONVERSATION_PhoneEventCode
114 * We are the callee and the phone is ringing.
115 * We should accept the call or hang up.
117 GNUNET_CONVERSATION_EC_PHONE_RING,
120 * The conversation was terminated by the caller.
121 * We must no longer use the caller's handle.
123 GNUNET_CONVERSATION_EC_PHONE_HUNG_UP
129 * Function called with an event emitted by a phone.
132 * @param code type of the event
133 * @param caller handle for the caller
134 * @param caller_id public key of the caller (in GNS)
137 (*GNUNET_CONVERSATION_PhoneEventHandler)(void *cls,
138 enum GNUNET_CONVERSATION_PhoneEventCode code,
139 struct GNUNET_CONVERSATION_Caller *caller,
140 const struct GNUNET_CRYPTO_EcdsaPublicKey *caller_id);
144 * Information about the current status of a call. Each call
145 * progresses from ring over ready to terminated. Steps may
148 enum GNUNET_CONVERSATION_CallerEventCode
152 * We are the callee and the caller suspended the call. Note that
153 * both sides can independently suspend and resume calls; a call is
154 * only "working" of both sides are active.
156 GNUNET_CONVERSATION_EC_CALLER_SUSPEND,
159 * We are the callee and the caller resumed the call. Note that
160 * both sides can independently suspend and resume calls; a call is
161 * only "working" of both sides are active.
163 GNUNET_CONVERSATION_EC_CALLER_RESUME
169 * Function called with an event emitted by a caller.
170 * These events are only generated after the phone is
174 * @param code type of the event for this caller
177 (*GNUNET_CONVERSATION_CallerEventHandler)(void *cls,
178 enum GNUNET_CONVERSATION_CallerEventCode code);
182 * A phone is a device that can ring to signal an incoming call and
183 * that you can pick up to answer the call and hang up to terminate
184 * the call. You can also hang up a ringing phone immediately
185 * (without picking it up) to stop it from ringing. Phones have
186 * caller ID. You can ask the phone for its record and make that
187 * record available (via GNS) to enable others to call you.
188 * Multiple phones maybe connected to the same line (the line is
189 * something rather internal to a phone and not obvious from it).
190 * You can only have one conversation per phone at any time.
192 struct GNUNET_CONVERSATION_Phone;
196 * Create a new phone.
198 * @param cfg configuration for the phone; specifies the phone service and
199 * which line the phone is to be connected to
200 * @param ego ego to use for name resolution (when determining caller ID)
201 * @param event_handler how to notify the owner of the phone about events
202 * @param event_handler_cls closure for @a event_handler
204 struct GNUNET_CONVERSATION_Phone *
205 GNUNET_CONVERSATION_phone_create (const struct GNUNET_CONFIGURATION_Handle *cfg,
206 const struct GNUNET_IDENTITY_Ego *ego,
207 GNUNET_CONVERSATION_PhoneEventHandler event_handler,
208 void *event_handler_cls);
212 * Fill in a namestore record with the contact information
213 * for this phone. Note that the filled in "data" value
214 * is only valid until the phone is destroyed.
216 * @param phone phone to create a record for
217 * @param rd namestore record to fill in
220 GNUNET_CONVERSATION_phone_get_record (struct GNUNET_CONVERSATION_Phone *phone,
221 struct GNUNET_GNSRECORD_Data *rd);
225 * Picks up a (ringing) phone call. This will connect the speaker
226 * to the microphone of the other party, and vice versa.
228 * @param caller handle that identifies which caller should be answered
229 * @param event_handler how to notify about events by the caller
230 * @param event_handler_cls closure for @a event_handler
231 * @param speaker speaker to use
232 * @param mic microphone to use
235 GNUNET_CONVERSATION_caller_pick_up (struct GNUNET_CONVERSATION_Caller *caller,
236 GNUNET_CONVERSATION_CallerEventHandler event_handler,
237 void *event_handler_cls,
238 struct GNUNET_SPEAKER_Handle *speaker,
239 struct GNUNET_MICROPHONE_Handle *mic);
243 * Pause conversation of an active call. This will disconnect the speaker
244 * and the microphone. The call can later be resumed with
245 * #GNUNET_CONVERSATION_caller_resume.
247 * @param caller call to suspend
250 GNUNET_CONVERSATION_caller_suspend (struct GNUNET_CONVERSATION_Caller *caller);
254 * Resume suspended conversation of a phone.
256 * @param caller call to resume
257 * @param speaker speaker to use
258 * @param mic microphone to use
261 GNUNET_CONVERSATION_caller_resume (struct GNUNET_CONVERSATION_Caller *caller,
262 struct GNUNET_SPEAKER_Handle *speaker,
263 struct GNUNET_MICROPHONE_Handle *mic);
267 * Hang up up a (possibly ringing or paused) phone. This will notify
268 * the caller that we are no longer interested in talking with them.
270 * @param caller who should we hang up on
273 GNUNET_CONVERSATION_caller_hang_up (struct GNUNET_CONVERSATION_Caller *caller);
279 * @param phone phone to destroy
282 GNUNET_CONVERSATION_phone_destroy (struct GNUNET_CONVERSATION_Phone *phone);
285 /* *********************** CALL API ************************ */
288 * Handle for an outgoing call.
290 struct GNUNET_CONVERSATION_Call;
294 * Information about the current status of a call.
296 enum GNUNET_CONVERSATION_CallEventCode
299 * We are the caller and are now ringing the other party (GNS lookup
302 GNUNET_CONVERSATION_EC_CALL_RINGING,
305 * We are the caller and are now ready to talk as the callee picked up.
307 GNUNET_CONVERSATION_EC_CALL_PICKED_UP,
310 * We are the caller and failed to locate a phone record in GNS.
311 * After this invocation, the respective call handle will be
312 * automatically destroyed and the client must no longer call
313 * #GNUNET_CONVERSATION_call_stop or any other function on the
316 GNUNET_CONVERSATION_EC_CALL_GNS_FAIL,
319 * We are the caller and the callee called
320 * #GNUNET_CONVERSATION_caller_hang_up. After this invocation, the
321 * respective call handle will be automatically destroyed and the
322 * client must no longer call #GNUNET_CONVERSATION_call_stop.
324 GNUNET_CONVERSATION_EC_CALL_HUNG_UP,
327 * We are the caller and the callee suspended the call. Note that
328 * both sides can independently suspend and resume calls; a call is
329 * only "working" of both sides are active.
331 GNUNET_CONVERSATION_EC_CALL_SUSPENDED,
334 * We are the caller and the callee suspended the call. Note that
335 * both sides can independently suspend and resume calls; a call is
336 * only "working" of both sides are active.
338 GNUNET_CONVERSATION_EC_CALL_RESUMED,
341 * We had an error handing the call, and are now restarting it
342 * (back to lookup). This happens, for example, if the peer
343 * is restarted during a call.
345 GNUNET_CONVERSATION_EC_CALL_ERROR
351 * Function called with an event emitted for a call.
354 * @param code type of the event on the call
357 (*GNUNET_CONVERSATION_CallEventHandler)(void *cls,
358 enum GNUNET_CONVERSATION_CallEventCode code);
362 * Call the phone of another user.
364 * @param cfg configuration to use, specifies our phone service
365 * @param caller_id identity of the caller
366 * @param zone_id GNS zone to use to resolve @a callee
367 * @param callee GNS name of the callee (used to locate the callee's record)
368 * @param speaker speaker to use (will be used automatically immediately once the
369 * #GNUNET_CONVERSATION_EC_CALL_PICKED_UP event is generated); we will NOT generate
370 * a ring tone on the speaker
371 * @param mic microphone to use (will be used automatically immediately once the
372 * #GNUNET_CONVERSATION_EC_CALL_PICKED_UP event is generated)
373 * @param event_handler how to notify the owner of the phone about events
374 * @param event_handler_cls closure for @a event_handler
375 * @return handle for the call
377 struct GNUNET_CONVERSATION_Call *
378 GNUNET_CONVERSATION_call_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
379 struct GNUNET_IDENTITY_Ego *caller_id,
380 struct GNUNET_IDENTITY_Ego *zone_id,
382 struct GNUNET_SPEAKER_Handle *speaker,
383 struct GNUNET_MICROPHONE_Handle *mic,
384 GNUNET_CONVERSATION_CallEventHandler event_handler,
385 void *event_handler_cls);
389 * Pause a call. Temporarily suspends the use of speaker and
392 * @param call call to pause
395 GNUNET_CONVERSATION_call_suspend (struct GNUNET_CONVERSATION_Call *call);
399 * Resumes a call after #GNUNET_CONVERSATION_call_suspend.
401 * @param call call to resume
402 * @param speaker speaker to use
403 * @param mic microphone to use
406 GNUNET_CONVERSATION_call_resume (struct GNUNET_CONVERSATION_Call *call,
407 struct GNUNET_SPEAKER_Handle *speaker,
408 struct GNUNET_MICROPHONE_Handle *mic);
412 * Terminate a call. The call may be ringing or ready at this time.
414 * @param call call to terminate
417 GNUNET_CONVERSATION_call_stop (struct GNUNET_CONVERSATION_Call *call);
420 #if 0 /* keep Emacsens' auto-indent happy */