channel.c

	clone->_softhangup = AST_SOFTHANGUP_DEV;


	/* And of course, so does our current state.  Note we need not
	   call ast_setstate since the event manager doesn't really consider
	   these separate.  We do this early so that the clone has the proper
	   state of the original channel. */
	origstate = original->_state;
	original->_state = clone->_state;
	clone->_state = origstate;

	if (clone->tech->fixup){
		res = clone->tech->fixup(original, clone);
		if (res) 
			ast_log(LOG_WARNING, "Fixup failed on channel %s, strange things may happen.\n", clone->name);
	}

	/* Start by disconnecting the original's physical side */
	if (clone->tech->hangup)
		res = clone->tech->hangup(clone);
	if (res) {
		ast_log(LOG_WARNING, "Hangup failed!  Strange things may happen!\n");
		ast_mutex_unlock(&clone->lock);
		return -1;
	}
	
	snprintf(zombn, sizeof(zombn), "%s<ZOMBIE>", orig);
	/* Mangle the name of the clone channel */
	ast_string_field_set(clone, name, zombn);
	manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", masqn, zombn, clone->uniqueid);

	/* Update the type. */
	t_pvt = original->monitor;
	original->monitor = clone->monitor;
	clone->monitor = t_pvt;
	
	/* Keep the same language.  */
	ast_string_field_set(original, language, clone->language);
	/* Copy the FD's other than the generator fd */
	for (x = 0; x < AST_MAX_FDS; x++) {
		if (x != AST_GENERATOR_FD)
			original->fds[x] = clone->fds[x];
	}
	clone_variables(original, clone);
	AST_LIST_HEAD_INIT_NOLOCK(&clone->varshead);
	/* Presense of ADSI capable CPE follows clone */
	original->adsicpe = clone->adsicpe;
	/* Bridge remains the same */
	/* CDR fields remain the same */
	/* XXX What about blocking, softhangup, blocker, and lock and blockproc? XXX */
	/* Application and data remain the same */
	/* Clone exception  becomes real one, as with fdno */
	ast_copy_flags(original, clone, AST_FLAG_EXCEPTION);
	original->fdno = clone->fdno;
	/* Schedule context remains the same */
	/* Stream stuff stays the same */
	/* Keep the original state.  The fixup code will need to work with it most likely */

	/* Just swap the whole structures, nevermind the allocations, they'll work themselves
	   out. */
	tmpcid = original->cid;
	original->cid = clone->cid;
	clone->cid = tmpcid;
	
	/* Restore original timing file descriptor */
	original->fds[AST_TIMING_FD] = original->timingfd;
	
	/* Our native formats are different now */
	original->nativeformats = clone->nativeformats;
	
	/* Context, extension, priority, app data, jump table,  remain the same */
	/* pvt switches.  pbx stays the same, as does next */
	
	/* Set the write format */
	ast_set_write_format(original, wformat);

	/* Set the read format */
	ast_set_read_format(original, rformat);

	/* Copy the music class */
	ast_string_field_set(original, musicclass, clone->musicclass);

	ast_log(LOG_DEBUG, "Putting channel %s in %d/%d formats\n", original->name, wformat, rformat);

	/* Okay.  Last thing is to let the channel driver know about all this mess, so he
	   can fix up everything as best as possible */
	if (original->tech->fixup) {
		res = original->tech->fixup(clone, original);
		if (res) {
			ast_log(LOG_WARNING, "Channel for type '%s' could not fixup channel %s\n",
				original->tech->type, original->name);
			ast_mutex_unlock(&clone->lock);
			return -1;
		}
	} else
		ast_log(LOG_WARNING, "Channel type '%s' does not have a fixup routine (for %s)!  Bad things may happen.\n",
			original->tech->type, original->name);
	
	/* Now, at this point, the "clone" channel is totally F'd up.  We mark it as
	   a zombie so nothing tries to touch it.  If it's already been marked as a
	   zombie, then free it now (since it already is considered invalid). */
	if (ast_test_flag(clone, AST_FLAG_ZOMBIE)) {
		ast_log(LOG_DEBUG, "Destroying channel clone '%s'\n", clone->name);
		ast_mutex_unlock(&clone->lock);
		manager_event(EVENT_FLAG_CALL, "Hangup", 
			"Channel: %s\r\n"
			"Uniqueid: %s\r\n"
			"Cause: %d\r\n"
			"Cause-txt: %s\r\n",
			clone->name, 
			clone->uniqueid, 
			clone->hangupcause,
			ast_cause2str(clone->hangupcause)
			);
		ast_channel_free(clone);
	} else {
		ast_log(LOG_DEBUG, "Released clone lock on '%s'\n", clone->name);
		ast_set_flag(clone, AST_FLAG_ZOMBIE);
		ast_queue_frame(clone, &ast_null_frame);
		ast_mutex_unlock(&clone->lock);
	}
	
	/* Signal any blocker */
	if (ast_test_flag(original, AST_FLAG_BLOCKING))
		pthread_kill(original->blocker, SIGURG);
	ast_log(LOG_DEBUG, "Done Masquerading %s (%d)\n", original->name, original->_state);
	return 0;
}

void ast_set_callerid(struct ast_channel *chan, const char *callerid, const char *calleridname, const char *ani)
{
	if (callerid) {
		if (chan->cid.cid_num)
			free(chan->cid.cid_num);
		if (ast_strlen_zero(callerid))
			chan->cid.cid_num = NULL;
		else
			chan->cid.cid_num = strdup(callerid);
	}
	if (calleridname) {
		if (chan->cid.cid_name)
			free(chan->cid.cid_name);
		if (ast_strlen_zero(calleridname))
			chan->cid.cid_name = NULL;
		else
			chan->cid.cid_name = strdup(calleridname);
	}
	if (ani) {
		if (chan->cid.cid_ani)
			free(chan->cid.cid_ani);
		if (ast_strlen_zero(ani))
			chan->cid.cid_ani = NULL;
		else
			chan->cid.cid_ani = strdup(ani);
	}
	if (chan->cdr)
		ast_cdr_setcid(chan->cdr, chan);
	manager_event(EVENT_FLAG_CALL, "Newcallerid", 
				"Channel: %s\r\n"
				"CallerID: %s\r\n"
				"CallerIDName: %s\r\n"
				"Uniqueid: %s\r\n"
				"CID-CallingPres: %d (%s)\r\n",
				chan->name, chan->cid.cid_num ? 
				chan->cid.cid_num : "<Unknown>",
				chan->cid.cid_name ? 
				chan->cid.cid_name : "<Unknown>",
				chan->uniqueid,
				chan->cid.cid_pres,
				ast_describe_caller_presentation(chan->cid.cid_pres)
				);
}

int ast_setstate(struct ast_channel *chan, int state)
{
	int oldstate = chan->_state;

	if (oldstate == state)
		return 0;

	chan->_state = state;
	ast_device_state_changed_literal(chan->name);
	manager_event(EVENT_FLAG_CALL,
		      (oldstate == AST_STATE_DOWN) ? "Newchannel" : "Newstate",
		      "Channel: %s\r\n"
		      "State: %s\r\n"
		      "CallerID: %s\r\n"
		      "CallerIDName: %s\r\n"
		      "Uniqueid: %s\r\n",
		      chan->name, ast_state2str(chan->_state), 
		      chan->cid.cid_num ? chan->cid.cid_num : "<unknown>", 
		      chan->cid.cid_name ? chan->cid.cid_name : "<unknown>", 
		      chan->uniqueid);

	return 0;
}

/*! \brief Find bridged channel */
struct ast_channel *ast_bridged_channel(struct ast_channel *chan)
{
	struct ast_channel *bridged;
	bridged = chan->_bridge;
	if (bridged && bridged->tech->bridged_channel) 
		bridged = bridged->tech->bridged_channel(chan, bridged);
	return bridged;
}

static void bridge_playfile(struct ast_channel *chan, struct ast_channel *peer, const char *sound, int remain) 
{
	int min = 0, sec = 0, check;

	check = ast_autoservice_start(peer);
	if (check) 
		return;

	if (remain > 0) {
		if (remain / 60 > 1) {
			min = remain / 60;
			sec = remain % 60;
		} else {
			sec = remain;
		}
	}
	
	if (!strcmp(sound,"timeleft")) {	/* Queue support */
		ast_streamfile(chan, "vm-youhave", chan->language);
		ast_waitstream(chan, "");
		if (min) {
			ast_say_number(chan, min, AST_DIGIT_ANY, chan->language, (char *) NULL);
			ast_streamfile(chan, "queue-minutes", chan->language);
			ast_waitstream(chan, "");
		}
		if (sec) {
			ast_say_number(chan, sec, AST_DIGIT_ANY, chan->language, (char *) NULL);
			ast_streamfile(chan, "queue-seconds", chan->language);
			ast_waitstream(chan, "");
		}
	} else {
		ast_streamfile(chan, sound, chan->language);
		ast_waitstream(chan, "");
	}

	check = ast_autoservice_stop(peer);
}

static enum ast_bridge_result ast_generic_bridge(struct ast_channel *c0, struct ast_channel *c1,
						 struct ast_bridge_config *config, struct ast_frame **fo,
						 struct ast_channel **rc, struct timeval bridge_end)
{
	/* Copy voice back and forth between the two channels. */
	struct ast_channel *cs[3];
	struct ast_frame *f;
	struct ast_channel *who = NULL;
	enum ast_bridge_result res = AST_BRIDGE_COMPLETE;
	int o0nativeformats;
	int o1nativeformats;
	int watch_c0_dtmf;
	int watch_c1_dtmf;
	void *pvt0, *pvt1;
	int to;
	
	cs[0] = c0;
	cs[1] = c1;
	pvt0 = c0->tech_pvt;
	pvt1 = c1->tech_pvt;
	o0nativeformats = c0->nativeformats;
	o1nativeformats = c1->nativeformats;
	watch_c0_dtmf = config->flags & AST_BRIDGE_DTMF_CHANNEL_0;
	watch_c1_dtmf = config->flags & AST_BRIDGE_DTMF_CHANNEL_1;

	for (;;) {
		if ((c0->tech_pvt != pvt0) || (c1->tech_pvt != pvt1) ||
		    (o0nativeformats != c0->nativeformats) ||
		    (o1nativeformats != c1->nativeformats)) {
			/* Check for Masquerade, codec changes, etc */
			res = AST_BRIDGE_RETRY;
			break;
		}
		if (bridge_end.tv_sec) {
			to = ast_tvdiff_ms(bridge_end, ast_tvnow());
			if (to <= 0) {
				res = AST_BRIDGE_RETRY;
				break;
			}
		} else
			to = -1;
		who = ast_waitfor_n(cs, 2, &to);
		if (!who) {
			ast_log(LOG_DEBUG, "Nobody there, continuing...\n"); 
			if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE || c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE) {
				if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
					c0->_softhangup = 0;
				if (c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
					c1->_softhangup = 0;
				c0->_bridge = c1;
				c1->_bridge = c0;
			}
			continue;
		}
		f = ast_read(who);
		if (!f) {
			*fo = NULL;
			*rc = who;
			res = AST_BRIDGE_COMPLETE;
			ast_log(LOG_DEBUG, "Didn't get a frame from channel: %s\n",who->name);
			break;
		}

		if ((f->frametype == AST_FRAME_CONTROL) && !(config->flags & AST_BRIDGE_IGNORE_SIGS)) {
			if ((f->subclass == AST_CONTROL_HOLD) || (f->subclass == AST_CONTROL_UNHOLD) ||
			    (f->subclass == AST_CONTROL_VIDUPDATE)) {
				ast_indicate(who == c0 ? c1 : c0, f->subclass);
			} else {
				*fo = f;
				*rc = who;
				res =  AST_BRIDGE_COMPLETE;
				ast_log(LOG_DEBUG, "Got a FRAME_CONTROL (%d) frame on channel %s\n", f->subclass, who->name);
				break;
			}
		}
		if ((f->frametype == AST_FRAME_VOICE) ||
		    (f->frametype == AST_FRAME_DTMF) ||
		    (f->frametype == AST_FRAME_VIDEO) || 
		    (f->frametype == AST_FRAME_IMAGE) ||
		    (f->frametype == AST_FRAME_HTML) ||
#if defined(T38_SUPPORT)
		    (f->frametype == AST_FRAME_MODEM) ||
#endif
		    (f->frametype == AST_FRAME_TEXT)) {
			if (f->frametype == AST_FRAME_DTMF) {
				if (((who == c0) && watch_c0_dtmf) ||
				    ((who == c1) && watch_c1_dtmf)) {
					*rc = who;
					*fo = f;
					res = AST_BRIDGE_COMPLETE;
					ast_log(LOG_DEBUG, "Got DTMF on channel (%s)\n", who->name);
					break;
				} else {
					goto tackygoto;
				}
			} else {
#if 0
				ast_log(LOG_DEBUG, "Read from %s\n", who->name);
				if (who == last) 
					ast_log(LOG_DEBUG, "Servicing channel %s twice in a row?\n", last->name);
				last = who;
#endif
tackygoto:
				ast_write((who == c0) ? c1 : c0, f);
			}
		}
		ast_frfree(f);

		/* Swap who gets priority */
		cs[2] = cs[0];
		cs[0] = cs[1];
		cs[1] = cs[2];
	}
	return res;
}

/*! \brief Bridge two channels together */
enum ast_bridge_result ast_channel_bridge(struct ast_channel *c0, struct ast_channel *c1,
					  struct ast_bridge_config *config, struct ast_frame **fo, struct ast_channel **rc) 
{
	struct ast_channel *who = NULL;
	enum ast_bridge_result res = AST_BRIDGE_COMPLETE;
	int nativefailed=0;
	int firstpass;
	int o0nativeformats;
	int o1nativeformats;
	long time_left_ms=0;
	struct timeval nexteventts = { 0, };
	char caller_warning = 0;
	char callee_warning = 0;
	int to;

	if (c0->_bridge) {
		ast_log(LOG_WARNING, "%s is already in a bridge with %s\n", 
			c0->name, c0->_bridge->name);
		return -1;
	}
	if (c1->_bridge) {
		ast_log(LOG_WARNING, "%s is already in a bridge with %s\n", 
			c1->name, c1->_bridge->name);
		return -1;
	}
	
	/* Stop if we're a zombie or need a soft hangup */
	if (ast_test_flag(c0, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c0) ||
	    ast_test_flag(c1, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c1)) 
		return -1;

	*fo = NULL;
	firstpass = config->firstpass;
	config->firstpass = 0;

	if (ast_tvzero(config->start_time))
		config->start_time = ast_tvnow();
	time_left_ms = config->timelimit;

	caller_warning = ast_test_flag(&config->features_caller, AST_FEATURE_PLAY_WARNING);
	callee_warning = ast_test_flag(&config->features_callee, AST_FEATURE_PLAY_WARNING);

	if (config->start_sound && firstpass) {
		if (caller_warning)
			bridge_playfile(c0, c1, config->start_sound, time_left_ms / 1000);
		if (callee_warning)
			bridge_playfile(c1, c0, config->start_sound, time_left_ms / 1000);
	}

	/* Keep track of bridge */
	c0->_bridge = c1;
	c1->_bridge = c0;
	
	manager_event(EVENT_FLAG_CALL, "Link", 
		      "Channel1: %s\r\n"
		      "Channel2: %s\r\n"
		      "Uniqueid1: %s\r\n"
		      "Uniqueid2: %s\r\n"
		      "CallerID1: %s\r\n"
		      "CallerID2: %s\r\n",
		      c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
                                                                        
	o0nativeformats = c0->nativeformats;
	o1nativeformats = c1->nativeformats;

	if (config->timelimit) {
		nexteventts = ast_tvadd(config->start_time, ast_samp2tv(config->timelimit, 1000));
		if (caller_warning || callee_warning)
			nexteventts = ast_tvsub(nexteventts, ast_samp2tv(config->play_warning, 1000));
	}

	for (/* ever */;;) {
		to = -1;
		if (config->timelimit) {
			struct timeval now;
			now = ast_tvnow();
			to = ast_tvdiff_ms(nexteventts, now);
			if (to < 0)
				to = 0;
			time_left_ms = config->timelimit - ast_tvdiff_ms(now, config->start_time);
			if (time_left_ms < to)
				to = time_left_ms;

			if (time_left_ms <= 0) {
				if (caller_warning && config->end_sound)
					bridge_playfile(c0, c1, config->end_sound, 0);
				if (callee_warning && config->end_sound)
					bridge_playfile(c1, c0, config->end_sound, 0);
				*fo = NULL;
				if (who) 
					*rc = who;
				res = 0;
				break;
			}
			
			if (!to) {
				if (time_left_ms >= 5000) {
					/* force the time left to round up if appropriate */
					if (caller_warning && config->warning_sound && config->play_warning)
						bridge_playfile(c0, c1, config->warning_sound,
								(time_left_ms + 500) / 1000);
					if (callee_warning && config->warning_sound && config->play_warning)
						bridge_playfile(c1, c0, config->warning_sound,
								(time_left_ms + 500) / 1000);
				}
				if (config->warning_freq) {
					nexteventts = ast_tvadd(nexteventts, ast_samp2tv(config->warning_freq, 1000));
				} else
					nexteventts = ast_tvadd(config->start_time, ast_samp2tv(config->timelimit, 1000));
			}
		}

		if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE || c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE) {
			if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
				c0->_softhangup = 0;
			if (c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
				c1->_softhangup = 0;
			c0->_bridge = c1;
			c1->_bridge = c0;
			ast_log(LOG_DEBUG, "Unbridge signal received. Ending native bridge.\n");
			continue;
		}
		
		/* Stop if we're a zombie or need a soft hangup */
		if (ast_test_flag(c0, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c0) ||
		    ast_test_flag(c1, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c1)) {
			*fo = NULL;
			if (who)
				*rc = who;
			res = 0;
			ast_log(LOG_DEBUG, "Bridge stops because we're zombie or need a soft hangup: c0=%s, c1=%s, flags: %s,%s,%s,%s\n",
				c0->name, c1->name,
				ast_test_flag(c0, AST_FLAG_ZOMBIE) ? "Yes" : "No",
				ast_check_hangup(c0) ? "Yes" : "No",
				ast_test_flag(c1, AST_FLAG_ZOMBIE) ? "Yes" : "No",
				ast_check_hangup(c1) ? "Yes" : "No");
			break;
		}

		if (c0->tech->bridge &&
		    (config->timelimit == 0) &&
		    (c0->tech->bridge == c1->tech->bridge) &&
		    !nativefailed && !c0->monitor && !c1->monitor &&
		    !c0->spies && !c1->spies) {
			/* Looks like they share a bridge method and nothing else is in the way */
			ast_set_flag(c0, AST_FLAG_NBRIDGE);
			ast_set_flag(c1, AST_FLAG_NBRIDGE);
			if ((res = c0->tech->bridge(c0, c1, config->flags, fo, rc, to)) == AST_BRIDGE_COMPLETE) {
				manager_event(EVENT_FLAG_CALL, "Unlink", 
					      "Channel1: %s\r\n"
					      "Channel2: %s\r\n"
					      "Uniqueid1: %s\r\n"
					      "Uniqueid2: %s\r\n"
					      "CallerID1: %s\r\n"
					      "CallerID2: %s\r\n",
					      c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
				ast_log(LOG_DEBUG, "Returning from native bridge, channels: %s, %s\n", c0->name, c1->name);

				ast_clear_flag(c0, AST_FLAG_NBRIDGE);
				ast_clear_flag(c1, AST_FLAG_NBRIDGE);

				if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE || c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
					continue;

				c0->_bridge = NULL;
				c1->_bridge = NULL;

				return res;
			} else {
				ast_clear_flag(c0, AST_FLAG_NBRIDGE);
				ast_clear_flag(c1, AST_FLAG_NBRIDGE);
			}
			switch (res) {
			case AST_BRIDGE_RETRY:
				continue;
			default:
				if (option_verbose > 2)
					ast_verbose(VERBOSE_PREFIX_3 "Native bridging %s and %s ended\n",
						    c0->name, c1->name);
				/* fallthrough */
			case AST_BRIDGE_FAILED_NOWARN:
				nativefailed++;
				break;
			}
		}
	
		if (((c0->writeformat != c1->readformat) || (c0->readformat != c1->writeformat) ||
		    (c0->nativeformats != o0nativeformats) || (c1->nativeformats != o1nativeformats)) &&
		    !(c0->generator || c1->generator)) {
			if (ast_channel_make_compatible(c0, c1)) {
				ast_log(LOG_WARNING, "Can't make %s and %s compatible\n", c0->name, c1->name);
                                manager_event(EVENT_FLAG_CALL, "Unlink",
					      "Channel1: %s\r\n"
					      "Channel2: %s\r\n"
					      "Uniqueid1: %s\r\n"
					      "Uniqueid2: %s\r\n"
					      "CallerID1: %s\r\n"
					      "CallerID2: %s\r\n",
					      c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
				return AST_BRIDGE_FAILED;
			}
			o0nativeformats = c0->nativeformats;
			o1nativeformats = c1->nativeformats;
		}
		res = ast_generic_bridge(c0, c1, config, fo, rc, nexteventts);
		if (res != AST_BRIDGE_RETRY)
			break;
	}

	c0->_bridge = NULL;
	c1->_bridge = NULL;

	manager_event(EVENT_FLAG_CALL, "Unlink",
		      "Channel1: %s\r\n"
		      "Channel2: %s\r\n"
		      "Uniqueid1: %s\r\n"
		      "Uniqueid2: %s\r\n"
		      "CallerID1: %s\r\n"
		      "CallerID2: %s\r\n",
		      c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
	ast_log(LOG_DEBUG, "Bridge stops bridging channels %s and %s\n", c0->name, c1->name);

	return res;
}

/*! \brief Sets an option on a channel */
int ast_channel_setoption(struct ast_channel *chan, int option, void *data, int datalen, int block)
{
	int res;

	if (chan->tech->setoption) {
		res = chan->tech->setoption(chan, option, data, datalen);
		if (res < 0)
			return res;
	} else {
		errno = ENOSYS;
		return -1;
	}
	if (block) {
		/* XXX Implement blocking -- just wait for our option frame reply, discarding
		   intermediate packets. XXX */
		ast_log(LOG_ERROR, "XXX Blocking not implemented yet XXX\n");
		return -1;
	}
	return 0;
}

struct tonepair_def {
	int freq1;
	int freq2;
	int duration;
	int vol;
};

struct tonepair_state {
	float freq1;
	float freq2;
	float vol;
	int duration;
	int pos;
	int origwfmt;
	struct ast_frame f;
	unsigned char offset[AST_FRIENDLY_OFFSET];
	short data[4000];
};

static void tonepair_release(struct ast_channel *chan, void *params)
{
	struct tonepair_state *ts = params;

	if (chan) {
		ast_set_write_format(chan, ts->origwfmt);
	}
	free(ts);
}

static void *tonepair_alloc(struct ast_channel *chan, void *params)
{
	struct tonepair_state *ts;
	struct tonepair_def *td = params;

	ts = calloc(1, sizeof(struct tonepair_state));
	if (!ts)
		return NULL;
	ts->origwfmt = chan->writeformat;
	if (ast_set_write_format(chan, AST_FORMAT_SLINEAR)) {
		ast_log(LOG_WARNING, "Unable to set '%s' to signed linear format (write)\n", chan->name);
		tonepair_release(NULL, ts);
		ts = NULL;
	} else {
		ts->freq1 = td->freq1;
		ts->freq2 = td->freq2;
		ts->duration = td->duration;
		ts->vol = td->vol;
	}
	/* Let interrupts interrupt :) */
	ast_set_flag(chan, AST_FLAG_WRITE_INT);
	return ts;
}

static int tonepair_generator(struct ast_channel *chan, void *data, int len, int samples)
{
	struct tonepair_state *ts = data;
	int x;

	/* we need to prepare a frame with 16 * timelen samples as we're 
	 * generating SLIN audio
	 */
	len = samples * 2;

	if (len > sizeof(ts->data) / 2 - 1) {
		ast_log(LOG_WARNING, "Can't generate that much data!\n");
		return -1;
	}
	memset(&ts->f, 0, sizeof(ts->f));
	for (x = 0; x < (len / 2); x++) {
		ts->data[x] = ts->vol * (
				sin((ts->freq1 * 2.0 * M_PI / 8000.0) * (ts->pos + x)) +
				sin((ts->freq2 * 2.0 * M_PI / 8000.0) * (ts->pos + x))
			);
	}
	ts->f.frametype = AST_FRAME_VOICE;
	ts->f.subclass = AST_FORMAT_SLINEAR;
	ts->f.datalen = len;
	ts->f.samples = samples;
	ts->f.offset = AST_FRIENDLY_OFFSET;
	ts->f.data = ts->data;
	ast_write(chan, &ts->f);
	ts->pos += x;
	if (ts->duration > 0) {
		if (ts->pos >= ts->duration * 8)
			return -1;
	}
	return 0;
}

static struct ast_generator tonepair = {
	alloc: tonepair_alloc,
	release: tonepair_release,
	generate: tonepair_generator,
};

int ast_tonepair_start(struct ast_channel *chan, int freq1, int freq2, int duration, int vol)
{
	struct tonepair_def d = { 0, };

	d.freq1 = freq1;
	d.freq2 = freq2;
	d.duration = duration;
	if (vol < 1)
		d.vol = 8192;
	else
		d.vol = vol;
	if (ast_activate_generator(chan, &tonepair, &d))
		return -1;
	return 0;
}

void ast_tonepair_stop(struct ast_channel *chan)
{
	ast_deactivate_generator(chan);
}

int ast_tonepair(struct ast_channel *chan, int freq1, int freq2, int duration, int vol)
{
	struct ast_frame *f;
	int res;

	if ((res = ast_tonepair_start(chan, freq1, freq2, duration, vol)))
		return res;

	/* Give us some wiggle room */
	while (chan->generatordata && (ast_waitfor(chan, 100) >= 0)) {
		f = ast_read(chan);
		if (f)
			ast_frfree(f);
		else
			return -1;
	}
	return 0;
}

ast_group_t ast_get_group(char *s)
{
	char *copy;
	char *piece;
	char *c=NULL;
	int start=0, finish=0, x;
	ast_group_t group = 0;

	c = copy = ast_strdupa(s);
	if (!copy)
		return 0;
	
	while ((piece = strsep(&c, ","))) {
		if (sscanf(piece, "%d-%d", &start, &finish) == 2) {
			/* Range */
		} else if (sscanf(piece, "%d", &start)) {
			/* Just one */
			finish = start;
		} else {
			ast_log(LOG_ERROR, "Syntax error parsing group configuration '%s' at '%s'. Ignoring.\n", s, piece);
			continue;
		}
		for (x = start; x <= finish; x++) {
			if ((x > 63) || (x < 0)) {
				ast_log(LOG_WARNING, "Ignoring invalid group %d (maximum group is 63)\n", x);
			} else
				group |= ((ast_group_t) 1 << x);
		}
	}
	return group;
}

static int (*ast_moh_start_ptr)(struct ast_channel *, const char *) = NULL;
static void (*ast_moh_stop_ptr)(struct ast_channel *) = NULL;
static void (*ast_moh_cleanup_ptr)(struct ast_channel *) = NULL;

void ast_install_music_functions(int (*start_ptr)(struct ast_channel *, const char *),
				 void (*stop_ptr)(struct ast_channel *),
				 void (*cleanup_ptr)(struct ast_channel *))
{
	ast_moh_start_ptr = start_ptr;
	ast_moh_stop_ptr = stop_ptr;
	ast_moh_cleanup_ptr = cleanup_ptr;
}

void ast_uninstall_music_functions(void) 
{
	ast_moh_start_ptr = NULL;
	ast_moh_stop_ptr = NULL;
	ast_moh_cleanup_ptr = NULL;
}

/*! \brief Turn on music on hold on a given channel */
int ast_moh_start(struct ast_channel *chan, const char *mclass) 
{
	if (ast_moh_start_ptr)
		return ast_moh_start_ptr(chan, mclass);

	if (option_verbose > 2)
		ast_verbose(VERBOSE_PREFIX_3 "Music class %s requested but no musiconhold loaded.\n", mclass ? mclass : "default");
	
	return 0;
}

/*! \brief Turn off music on hold on a given channel */
void ast_moh_stop(struct ast_channel *chan) 
{
	if (ast_moh_stop_ptr)
		ast_moh_stop_ptr(chan);
}

void ast_moh_cleanup(struct ast_channel *chan) 
{
	if (ast_moh_cleanup_ptr)
		ast_moh_cleanup_ptr(chan);
}

void ast_channels_init(void)
{
	ast_cli_register(&cli_show_channeltypes);
	ast_cli_register(&cli_show_channeltype);
}

/*! \brief Print call group and pickup group ---*/
char *ast_print_group(char *buf, int buflen, ast_group_t group) 
{
	unsigned int i;
	int first=1;
	char num[3];

	buf[0] = '\0';
	
	if (!group)	/* Return empty string if no group */
		return buf;

	for (i = 0; i <= 63; i++) {	/* Max group is 63 */
		if (group & ((ast_group_t) 1 << i)) {
	   		if (!first) {
				strncat(buf, ", ", buflen);
			} else {
				first=0;
	  		}
			snprintf(num, sizeof(num), "%u", i);
			strncat(buf, num, buflen);
		}
	}
	return buf;
}

void ast_set_variables(struct ast_channel *chan, struct ast_variable *vars)
{
	struct ast_variable *cur;

	for (cur = vars; cur; cur = cur->next)
		pbx_builtin_setvar_helper(chan, cur->name, cur->value);	
}

static void copy_data_from_queue(struct ast_channel_spy_queue *queue, short *buf, unsigned int samples)
{
	struct ast_frame *f;
	int tocopy;
	int bytestocopy;

	while (samples) {
		f = queue->head;

		if (!f) {
			ast_log(LOG_ERROR, "Ran out of frames before buffer filled!\n");
			break;
		}

		tocopy = (f->samples > samples) ? samples : f->samples;
		bytestocopy = ast_codec_get_len(queue->format, tocopy);
		memcpy(buf, f->data, bytestocopy);
		samples -= tocopy;
		buf += tocopy;
		f->samples -= tocopy;
		f->data += bytestocopy;
		f->datalen -= bytestocopy;
		f->offset += bytestocopy;
		queue->samples -= tocopy;
		if (!f->samples) {
			queue->head = f->next;
			ast_frfree(f);
		}
	}
}

struct ast_frame *ast_channel_spy_read_frame(struct ast_channel_spy *spy, unsigned int samples)
{
	struct ast_frame *result;
	/* buffers are allocated to hold SLINEAR, which is the largest format */
        short read_buf[samples];
        short write_buf[samples];
	struct ast_frame *read_frame;
	struct ast_frame *write_frame;
	int need_dup;
	struct ast_frame stack_read_frame = { .frametype = AST_FRAME_VOICE,
					      .subclass = spy->read_queue.format,
					      .data = read_buf,
					      .samples = samples,
					      .datalen = ast_codec_get_len(spy->read_queue.format, samples),
	};
	struct ast_frame stack_write_frame = { .frametype = AST_FRAME_VOICE,
					       .subclass = spy->write_queue.format,
					       .data = write_buf,
					       .samples = samples,
					       .datalen = ast_codec_get_len(spy->write_queue.format, samples),
	};

	/* if a flush has been requested, dump everything in whichever queue is larger */
	if (ast_test_flag(spy, CHANSPY_TRIGGER_FLUSH)) {
		if (spy->read_queue.samples > spy->write_queue.samples) {
			if (ast_test_flag(spy, CHANSPY_READ_VOLADJUST)) {
				for (result = spy->read_queue.head; result; result = result->next)
					ast_frame_adjust_volume(result, spy->read_vol_adjustment);
			}
			result = spy->read_queue.head;
			spy->read_queue.head = NULL;
			spy->read_queue.samples = 0;
			ast_clear_flag(spy, CHANSPY_TRIGGER_FLUSH);
			return result;
		} else {
			if (ast_test_flag(spy, CHANSPY_WRITE_VOLADJUST)) {
				for (result = spy->write_queue.head; result; result = result->next)
					ast_frame_adjust_volume(result, spy->write_vol_adjustment);
			}
			result = spy->write_queue.head;
			spy->write_queue.head = NULL;
			spy->write_queue.samples = 0;
			ast_clear_flag(spy, CHANSPY_TRIGGER_FLUSH);
			return result;
		}
	}

	if ((spy->read_queue.samples < samples) || (spy->write_queue.samples < samples))
		return NULL;

	/* short-circuit if both head frames have exactly what we want */
	if ((spy->read_queue.head->samples == samples) &&
	    (spy->write_queue.head->samples == samples)) {
		read_frame = spy->read_queue.head;
		spy->read_queue.head = read_frame->next;
		read_frame->next = NULL;

		write_frame = spy->write_queue.head;
		spy->write_queue.head = write_frame->next;
		write_frame->next = NULL;

		spy->read_queue.samples -= samples;
		spy->write_queue.samples -= samples;

		need_dup = 0;
	} else {
		copy_data_from_queue(&spy->read_queue, read_buf, samples);
		copy_data_from_queue(&spy->write_queue, write_buf, samples);

		read_frame = &stack_read_frame;
		write_frame = &stack_write_frame;
		need_dup = 1;
	}
	
	if (ast_test_flag(spy, CHANSPY_READ_VOLADJUST))
		ast_frame_adjust_volume(read_frame, spy->read_vol_adjustment);

	if (ast_test_flag(spy, CHANSPY_WRITE_VOLADJUST))
		ast_frame_adjust_volume(write_frame, spy->write_vol_adjustment);

	if (ast_test_flag(spy, CHANSPY_MIXAUDIO)) {
		ast_frame_slinear_sum(read_frame, write_frame);

		if (need_dup)
			result = ast_frdup(read_frame);
		else {
			result = read_frame;
			ast_frfree(write_frame);
		}
	} else {
		if (need_dup) {
			result = ast_frdup(read_frame);
			result->next = ast_frdup(write_frame);
		} else {
			result = read_frame;
			result->next = write_frame;
		}
	}

	return result;
}

static void *silence_generator_alloc(struct ast_channel *chan, void *data)
{
	/* just store the data pointer in the channel structure */
	return data;
}