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asterisk/channels/dahdi/bridge_native_dahdi.c

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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2013 Digium, Inc.
*
* Richard Mudgett <rmudgett@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 Native DAHDI bridging support.
*
* \author Richard Mudgett <rmudgett@digium.com>
*
* See Also:
* \arg \ref AstCREDITS
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
#include "../sig_analog.h"
#if defined(HAVE_PRI)
#include "../sig_pri.h"
#endif /* defined(HAVE_PRI) */
#include "../chan_dahdi.h"
#include "bridge_native_dahdi.h"
#include "asterisk/bridge.h"
#include "asterisk/bridge_technology.h"
#include "asterisk/frame.h"
#include "asterisk/format_cache.h"
/* ------------------------------------------------------------------- */
static const struct ast_channel_tech *dahdi_tech;
struct native_pvt_chan {
/*! Original private. */
struct dahdi_pvt *pvt;
/*! Original private owner. */
struct ast_channel *owner;
/*! Original owner index. */
int index;
/*! Original file descriptor 0. */
int fd0;
/*! Original channel state. */
int state;
/*! Original inthreeway. */
unsigned int inthreeway:1;
};
struct native_pvt_bridge {
/*! Master channel in the native bridge. */
struct dahdi_pvt *master;
/*! Slave channel in the native bridge. */
struct dahdi_pvt *slave;
/*! TRUE if the bridge can start when ready. */
unsigned int saw_start:1;
/*! TRUE if the channels are connected in a conference. */
unsigned int connected:1;
#if defined(HAVE_PRI) && defined(PRI_2BCT)
/*!
* \brief TRUE if tried to eliminate possible PRI tromboned call.
*
* \note A tromboned call uses two B channels of the same ISDN
* span. One leg comes into Asterisk, the other leg goes out of
* Asterisk, and Asterisk is natively bridging the two legs.
*/
unsigned int tried_trombone_removal:1;
#endif /* defined(HAVE_PRI) && defined(PRI_2BCT) */
};
/*!
* \internal
* \brief Create a bridge technology instance for a bridge.
* \since 12.0.0
*
* \retval 0 on success
* \retval -1 on failure
*
* \note On entry, bridge may or may not already be locked.
* However, it can be accessed as if it were locked.
*/
static int native_bridge_create(struct ast_bridge *bridge)
{
struct native_pvt_bridge *tech_pvt;
ast_assert(!bridge->tech_pvt);
tech_pvt = ast_calloc(1, sizeof(*tech_pvt));
if (!tech_pvt) {
return -1;
}
bridge->tech_pvt = tech_pvt;
return 0;
}
/*!
* \internal
* \brief Destroy a bridging technology instance for a bridge.
* \since 12.0.0
*
* \note On entry, bridge must NOT be locked.
*/
static void native_bridge_destroy(struct ast_bridge *bridge)
{
struct native_pvt_bridge *tech_pvt;
tech_pvt = bridge->tech_pvt;
bridge->tech_pvt = NULL;
ast_free(tech_pvt);
}
/*!
* \internal
* \brief Stop native bridging activity.
* \since 12.0.0
*
* \param bridge What to operate upon.
*
* \return Nothing
*
* \note On entry, bridge is already locked.
*/
static void native_stop(struct ast_bridge *bridge)
{
struct native_pvt_bridge *bridge_tech_pvt;
struct ast_bridge_channel *cur;
ast_assert(bridge->tech_pvt != NULL);
AST_LIST_TRAVERSE(&bridge->channels, cur, entry) {
struct native_pvt_chan *chan_tech_pvt;
chan_tech_pvt = cur->tech_pvt;
if (!chan_tech_pvt) {
continue;
}
ast_mutex_lock(&chan_tech_pvt->pvt->lock);
if (chan_tech_pvt->pvt == ast_channel_tech_pvt(cur->chan)) {
dahdi_ec_enable(chan_tech_pvt->pvt);
}
if (chan_tech_pvt->index == SUB_REAL) {
dahdi_dtmf_detect_enable(chan_tech_pvt->pvt);
}
ast_mutex_unlock(&chan_tech_pvt->pvt->lock);
}
bridge_tech_pvt = bridge->tech_pvt;
dahdi_master_slave_unlink(bridge_tech_pvt->slave, bridge_tech_pvt->master, 1);
ast_debug(2, "Stop native bridging %s and %s\n",
ast_channel_name(AST_LIST_FIRST(&bridge->channels)->chan),
ast_channel_name(AST_LIST_LAST(&bridge->channels)->chan));
}
/*!
* \internal
* \brief Request to stop native bridging activity.
* \since 12.0.0
*
* \param bridge What to operate upon.
*
* \return Nothing
*
* \note On entry, bridge is already locked.
*/
static void native_request_stop(struct ast_bridge *bridge)
{
struct native_pvt_bridge *tech_pvt;
ast_assert(bridge->tech_pvt != NULL);
tech_pvt = bridge->tech_pvt;
if (!tech_pvt->connected) {
return;
}
tech_pvt->connected = 0;
/* Now to actually stop the bridge. */
native_stop(bridge);
}
/*!
* \internal
* \brief Start native bridging activity.
* \since 12.0.0
*
* \param bridge What to operate upon.
*
* \retval 0 on success.
* \retval -1 on error. Could not start the bridge.
*
* \note On entry, bridge may or may not already be locked.
* However, it can be accessed as if it were locked.
*/
static int native_start(struct ast_bridge *bridge)
{
struct native_pvt_bridge *tech_pvt;
struct ast_bridge_channel *bc0;
struct ast_bridge_channel *bc1;
struct native_pvt_chan *npc0;
struct native_pvt_chan *npc1;
struct ast_channel *c0;
struct ast_channel *c1;
struct dahdi_pvt *p0;
struct dahdi_pvt *p1;
struct dahdi_pvt *master;
struct dahdi_pvt *slave;
int inconf;
int nothing_ok;
ast_assert(bridge->tech_pvt != NULL);
bc0 = AST_LIST_FIRST(&bridge->channels);
bc1 = AST_LIST_LAST(&bridge->channels);
c0 = bc0->chan;
c1 = bc1->chan;
/* Lock channels and privates */
for (;;) {
ast_channel_lock(c0);
if (!ast_channel_trylock(c1)) {
p0 = ast_channel_tech_pvt(c0);
if (!ast_mutex_trylock(&p0->lock)) {
p1 = ast_channel_tech_pvt(c1);
if (!ast_mutex_trylock(&p1->lock)) {
/* Got all locks */
break;
}
ast_mutex_unlock(&p0->lock);
}
ast_channel_unlock(c1);
}
ast_channel_unlock(c0);
sched_yield();
}
npc0 = bc0->tech_pvt;
ast_assert(npc0 != NULL);
npc0->pvt = p0;
npc0->owner = p0->owner;
npc0->index = dahdi_get_index(c0, p0, 0);
npc0->fd0 = ast_channel_fd(c0, 0);
npc0->state = -1;
npc0->inthreeway = p0->subs[SUB_REAL].inthreeway;
npc1 = bc1->tech_pvt;
ast_assert(npc1 != NULL);
npc1->pvt = p1;
npc1->owner = p1->owner;
npc1->index = dahdi_get_index(c1, p1, 0);
npc1->fd0 = ast_channel_fd(c1, 0);
npc1->state = -1;
npc1->inthreeway = p1->subs[SUB_REAL].inthreeway;
/*
* Check things that can change on the privates while in native
* bridging and cause native to not activate.
*/
if (npc0->index < 0 || npc1->index < 0
#if defined(HAVE_PRI)
/*
* PRI nobch channels (hold and call waiting) are equivalent to
* pseudo channels and cannot be nativly bridged.
*/
|| (dahdi_sig_pri_lib_handles(p0->sig)
&& ((struct sig_pri_chan *) p0->sig_pvt)->no_b_channel)
|| (dahdi_sig_pri_lib_handles(p1->sig)
&& ((struct sig_pri_chan *) p1->sig_pvt)->no_b_channel)
#endif /* defined(HAVE_PRI) */
) {
ast_mutex_unlock(&p0->lock);
ast_mutex_unlock(&p1->lock);
ast_channel_unlock(c0);
ast_channel_unlock(c1);
return -1;
}
inconf = 0;
nothing_ok = 1;
master = NULL;
slave = NULL;
if (npc0->index == SUB_REAL && npc1->index == SUB_REAL) {
if (p0->owner && p1->owner) {
/*
* If we don't have a call-wait in a 3-way, and we aren't in a
* 3-way, we can be master.
*/
if (!p0->subs[SUB_CALLWAIT].inthreeway && !p1->subs[SUB_REAL].inthreeway) {
master = p0;
slave = p1;
inconf = 1;
} else if (!p1->subs[SUB_CALLWAIT].inthreeway && !p0->subs[SUB_REAL].inthreeway) {
master = p1;
slave = p0;
inconf = 1;
} else {
ast_log(LOG_WARNING, "Huh? Both calls are callwaits or 3-ways? That's clever...?\n");
ast_log(LOG_WARNING, "p0: chan %d/%d/CW%d/3W%d, p1: chan %d/%d/CW%d/3W%d\n",
p0->channel,
npc0->index, (p0->subs[SUB_CALLWAIT].dfd > -1) ? 1 : 0,
p0->subs[SUB_REAL].inthreeway,
p0->channel,
npc0->index, (p1->subs[SUB_CALLWAIT].dfd > -1) ? 1 : 0,
p1->subs[SUB_REAL].inthreeway);
}
nothing_ok = 0;
}
} else if (npc0->index == SUB_REAL && npc1->index == SUB_THREEWAY) {
if (p1->subs[SUB_THREEWAY].inthreeway) {
master = p1;
slave = p0;
nothing_ok = 0;
}
} else if (npc0->index == SUB_THREEWAY && npc1->index == SUB_REAL) {
if (p0->subs[SUB_THREEWAY].inthreeway) {
master = p0;
slave = p1;
nothing_ok = 0;
}
} else if (npc0->index == SUB_REAL && npc1->index == SUB_CALLWAIT) {
/*
* We have a real and a call wait. If we're in a three way
* call, put us in it, otherwise, don't put us in anything.
*/
if (p1->subs[SUB_CALLWAIT].inthreeway) {
master = p1;
slave = p0;
nothing_ok = 0;
}
} else if (npc0->index == SUB_CALLWAIT && npc1->index == SUB_REAL) {
/* Same as previous */
if (p0->subs[SUB_CALLWAIT].inthreeway) {
master = p0;
slave = p1;
nothing_ok = 0;
}
}
ast_debug(3, "master: %d, slave: %d, nothing_ok: %d\n",
master ? master->channel : 0,
slave ? slave->channel : 0,
nothing_ok);
if (master && slave) {
/*
* Stop any tones, or play ringtone as appropriate. If they are
* bridged in an active threeway call with a channel that is
* ringing, we should indicate ringing.
*/
if (npc1->index == SUB_THREEWAY
&& p1->subs[SUB_THREEWAY].inthreeway
&& p1->subs[SUB_REAL].owner
&& p1->subs[SUB_REAL].inthreeway
&& ast_channel_state(p1->subs[SUB_REAL].owner) == AST_STATE_RINGING) {
ast_debug(2,
"Playing ringback on %d/%d(%s) since %d/%d(%s) is in a ringing three-way\n",
p0->channel, npc0->index, ast_channel_name(c0),
p1->channel, npc1->index, ast_channel_name(c1));
tone_zone_play_tone(p0->subs[npc0->index].dfd, DAHDI_TONE_RINGTONE);
npc1->state = ast_channel_state(p1->subs[SUB_REAL].owner);
} else {
ast_debug(2, "Stopping tones on %d/%d(%s) talking to %d/%d(%s)\n",
p0->channel, npc0->index, ast_channel_name(c0),
p1->channel, npc1->index, ast_channel_name(c1));
tone_zone_play_tone(p0->subs[npc0->index].dfd, -1);
}
if (npc0->index == SUB_THREEWAY
&& p0->subs[SUB_THREEWAY].inthreeway
&& p0->subs[SUB_REAL].owner
&& p0->subs[SUB_REAL].inthreeway
&& ast_channel_state(p0->subs[SUB_REAL].owner) == AST_STATE_RINGING) {
ast_debug(2,
"Playing ringback on %d/%d(%s) since %d/%d(%s) is in a ringing three-way\n",
p1->channel, npc1->index, ast_channel_name(c1),
p0->channel, npc0->index, ast_channel_name(c0));
tone_zone_play_tone(p1->subs[npc1->index].dfd, DAHDI_TONE_RINGTONE);
npc0->state = ast_channel_state(p0->subs[SUB_REAL].owner);
} else {
ast_debug(2, "Stopping tones on %d/%d(%s) talking to %d/%d(%s)\n",
p1->channel, npc1->index, ast_channel_name(c1),
p0->channel, npc0->index, ast_channel_name(c0));
tone_zone_play_tone(p1->subs[npc1->index].dfd, -1);
}
if (npc0->index == SUB_REAL && npc1->index == SUB_REAL) {
if (!p0->echocanbridged || !p1->echocanbridged) {
/* Disable echo cancellation if appropriate */
dahdi_ec_disable(p0);
dahdi_ec_disable(p1);
}
}
dahdi_master_slave_link(slave, master);
master->inconference = inconf;
} else if (!nothing_ok) {
ast_log(LOG_WARNING, "Can't link %d/%s with %d/%s\n",
p0->channel, subnames[npc0->index],
p1->channel, subnames[npc1->index]);
}
dahdi_conf_update(p0);
dahdi_conf_update(p1);
ast_channel_unlock(c0);
ast_channel_unlock(c1);
/* Native bridge failed */
if ((!master || !slave) && !nothing_ok) {
ast_mutex_unlock(&p0->lock);
ast_mutex_unlock(&p1->lock);
return -1;
}
if (npc0->index == SUB_REAL) {
dahdi_dtmf_detect_disable(p0);
}
if (npc1->index == SUB_REAL) {
dahdi_dtmf_detect_disable(p1);
}
ast_mutex_unlock(&p0->lock);
ast_mutex_unlock(&p1->lock);
tech_pvt = bridge->tech_pvt;
tech_pvt->master = master;
tech_pvt->slave = slave;
ast_debug(2, "Start native bridging %s and %s\n",
ast_channel_name(c0), ast_channel_name(c1));
#if defined(HAVE_PRI) && defined(PRI_2BCT)
if (!tech_pvt->tried_trombone_removal) {
tech_pvt->tried_trombone_removal = 1;
if (p0->pri && p0->pri == p1->pri && p0->pri->transfer) {
q931_call *q931_c0;
q931_call *q931_c1;
/* Try to eliminate the tromboned call. */
ast_mutex_lock(&p0->pri->lock);
ast_assert(dahdi_sig_pri_lib_handles(p0->sig));
ast_assert(dahdi_sig_pri_lib_handles(p1->sig));
q931_c0 = ((struct sig_pri_chan *) (p0->sig_pvt))->call;
q931_c1 = ((struct sig_pri_chan *) (p1->sig_pvt))->call;
if (q931_c0 && q931_c1) {
pri_channel_bridge(q931_c0, q931_c1);
ast_debug(2, "Attempt to eliminate tromboned call with %s and %s\n",
ast_channel_name(c0), ast_channel_name(c1));
}
ast_mutex_unlock(&p0->pri->lock);
}
}
#endif /* defined(HAVE_PRI) && defined(PRI_2BCT) */
return 0;
}
/*!
* \internal
* \brief Request to start native bridging activity.
* \since 12.0.0
*
* \param bridge What to operate upon.
*
* \return Nothing
*
* \note On entry, bridge may or may not already be locked.
* However, it can be accessed as if it were locked.
*/
static void native_request_start(struct ast_bridge *bridge)
{
struct native_pvt_bridge *tech_pvt;
struct ast_bridge_channel *cur;
ast_assert(bridge->tech_pvt != NULL);
tech_pvt = bridge->tech_pvt;
if (bridge->num_channels != 2 || !tech_pvt->saw_start || tech_pvt->connected) {
return;
}
AST_LIST_TRAVERSE(&bridge->channels, cur, entry) {
if (cur->suspended || !cur->tech_pvt) {
return;
}
}
/* Actually try starting the native bridge. */
if (native_start(bridge)) {
return;
}
tech_pvt->connected = 1;
}
/*!
* \internal
* \brief Request a bridge technology instance start operations.
* \since 12.0.0
*
* \retval 0 on success
* \retval -1 on failure
*
* \note On entry, bridge may or may not already be locked.
* However, it can be accessed as if it were locked.
*/
static int native_bridge_start(struct ast_bridge *bridge)
{
struct native_pvt_bridge *tech_pvt;
ast_assert(bridge->tech_pvt != NULL);
tech_pvt = bridge->tech_pvt;
tech_pvt->saw_start = 1;
native_request_start(bridge);
return 0;
}
/*!
* \internal
* \brief Request a bridge technology instance stop in preparation for being destroyed.
* \since 12.0.0
*
* \note On entry, bridge is already locked.
*/
static void native_bridge_stop(struct ast_bridge *bridge)
{
struct native_pvt_bridge *tech_pvt;
tech_pvt = bridge->tech_pvt;
if (!tech_pvt) {
return;
}
tech_pvt->saw_start = 0;
native_request_stop(bridge);
}
/*!
* \internal
* \brief Add a channel to a bridging technology instance for a bridge.
* \since 12.0.0
*
* \retval 0 on success
* \retval -1 on failure
*
* \note On entry, bridge is already locked.
*/
static int native_bridge_join(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
{
struct native_pvt_chan *tech_pvt;
struct ast_channel *c0;
struct ast_channel *c1;
ast_assert(!bridge_channel->tech_pvt);
tech_pvt = ast_calloc(1, sizeof(*tech_pvt));
if (!tech_pvt) {
return -1;
}
bridge_channel->tech_pvt = tech_pvt;
native_request_start(bridge);
/*
* Make the channels compatible in case the native bridge did
* not start for some reason and we need to fallback to 1-1
* bridging.
*/
c0 = AST_LIST_FIRST(&bridge->channels)->chan;
c1 = AST_LIST_LAST(&bridge->channels)->chan;
if (c0 == c1) {
return 0;
}
return ast_channel_make_compatible(c0, c1);
}
/*!
* \internal
* \brief Remove a channel from a bridging technology instance for a bridge.
* \since 12.0.0
*
* \note On entry, bridge is already locked.
*/
static void native_bridge_leave(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
{
struct native_pvt_chan *tech_pvt;
native_request_stop(bridge);
tech_pvt = bridge_channel->tech_pvt;
bridge_channel->tech_pvt = NULL;
ast_free(tech_pvt);
}
/*!
* \internal
* \brief Suspend a channel on a bridging technology instance for a bridge.
* \since 12.0.0
*
* \note On entry, bridge is already locked.
*/
static void native_bridge_suspend(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
{
native_request_stop(bridge);
}
/*!
* \internal
* \brief Unsuspend a channel on a bridging technology instance for a bridge.
* \since 12.0.0
*
* \note On entry, bridge is already locked.
*/
static void native_bridge_unsuspend(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
{
native_request_start(bridge);
}
/*!
* \internal
* \brief Check if channel is compatible.
* \since 12.0.0
*
* \param bridge_channel Is this channel compatible.
*
* \retval TRUE if channel is compatible with native DAHDI bridge.
*/
static int native_bridge_is_capable(struct ast_bridge_channel *bridge_channel)
{
struct ast_channel *chan = bridge_channel->chan;
struct dahdi_pvt *pvt;
int is_capable;
if (ao2_container_count(bridge_channel->features->dtmf_hooks)) {
ast_debug(2, "Channel '%s' has DTMF hooks.\n", ast_channel_name(chan));
return 0;
}
ast_channel_lock(chan);
if (dahdi_tech != ast_channel_tech(chan)) {
ast_debug(2, "Channel '%s' is not %s.\n",
ast_channel_name(chan), dahdi_tech->type);
ast_channel_unlock(chan);
return 0;
}
if (ast_channel_has_audio_frame_or_monitor(chan)) {
ast_debug(2, "Channel '%s' has an active monitor, audiohook, or framehook.\n",
ast_channel_name(chan));
ast_channel_unlock(chan);
return 0;
}
pvt = ast_channel_tech_pvt(chan);
if (!pvt || !pvt->sig) {
/* No private; or signaling is for a pseudo channel. */
ast_channel_unlock(chan);
return 0;
}
is_capable = 1;
ast_mutex_lock(&pvt->lock);
if (pvt->callwaiting && pvt->callwaitingcallerid) {
/*
* Call Waiting Caller ID requires DTMF detection to know if it
* can send the CID spill.
*/
ast_debug(2, "Channel '%s' has call waiting caller ID enabled.\n",
ast_channel_name(chan));
is_capable = 0;
}
ast_mutex_unlock(&pvt->lock);
ast_channel_unlock(chan);
return is_capable;
}
/*!
* \internal
* \brief Check if a bridge is compatible with the bridging technology.
* \since 12.0.0
*
* \retval 0 if not compatible
* \retval non-zero if compatible
*
* \note On entry, bridge may or may not already be locked.
* However, it can be accessed as if it were locked.
*/
static int native_bridge_compatible(struct ast_bridge *bridge)
{
struct ast_bridge_channel *cur;
/* We require two channels before even considering native bridging. */
if (bridge->num_channels != 2) {
ast_debug(1, "Bridge %s: Cannot use native DAHDI. Must have two channels.\n",
bridge->uniqueid);
return 0;
}
AST_LIST_TRAVERSE(&bridge->channels, cur, entry) {
if (!native_bridge_is_capable(cur)) {
ast_debug(1, "Bridge %s: Cannot use native DAHDI. Channel '%s' not compatible.\n",
bridge->uniqueid, ast_channel_name(cur->chan));
return 0;
}
}
return -1;
}
/*!
* \internal
* \brief Check if something changed on the channel.
* \since 12.0.0
*
* \param bridge_channel What to operate upon.
*
* \retval 0 Nothing changed.
* \retval -1 Something changed.
*
* \note On entry, bridge_channel->bridge is already locked.
*/
static int native_chan_changed(struct ast_bridge_channel *bridge_channel)
{
struct native_pvt_chan *tech_pvt;
struct ast_channel *chan;
struct dahdi_pvt *pvt;
int idx = -1;
ast_assert(bridge_channel->tech_pvt != NULL);
tech_pvt = bridge_channel->tech_pvt;
chan = bridge_channel->chan;
ast_channel_lock(chan);
pvt = ast_channel_tech_pvt(chan);
if (tech_pvt->pvt == pvt) {
idx = dahdi_get_index(chan, pvt, 1);
}
ast_channel_unlock(chan);
if (/* Did chan get masqueraded or PRI change associated B channel? */
tech_pvt->pvt != pvt
/* Did the pvt active owner change? */
|| tech_pvt->owner != pvt->owner
/* Did the pvt three way call status change? */
|| tech_pvt->inthreeway != pvt->subs[SUB_REAL].inthreeway
/* Did the owner index change? */
|| tech_pvt->index != idx
/*
* Did chan file descriptor change? (This seems redundant with
* masquerade and active owner change checks.)
*/
|| tech_pvt->fd0 != ast_channel_fd(chan, 0)
/* Did chan state change? i.e. Did it stop ringing? */
|| (pvt->subs[SUB_REAL].owner
&& tech_pvt->state > -1
&& tech_pvt->state != ast_channel_state(pvt->subs[SUB_REAL].owner))) {
return -1;
}
return 0;
}
/*!
* \internal
* \brief Check if something changed on the bridge channels.
* \since 12.0.0
*
* \param bridge What to operate upon.
*
* \retval 0 Nothing changed.
* \retval -1 Something changed.
*
* \note On entry, bridge is already locked.
*/
static int native_bridge_changed(struct ast_bridge *bridge)
{
struct ast_bridge_channel *cur;
AST_LIST_TRAVERSE(&bridge->channels, cur, entry) {
if (native_chan_changed(cur)) {
ast_debug(1, "Bridge %s: Something changed on channel '%s'.\n",
bridge->uniqueid, ast_channel_name(cur->chan));
return -1;
}
}
return 0;
}
/*!
* \internal
* \brief Write a frame into the bridging technology instance for a bridge.
* \since 12.0.0
*
* \note The bridge must be tolerant of bridge_channel being NULL.
*
* \retval 0 Frame accepted into the bridge.
* \retval -1 Frame needs to be deferred.
*
* \note On entry, bridge is already locked.
*/
static int native_bridge_write(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
{
struct native_pvt_bridge *tech_pvt;
/*
* When we are not native bridged by DAHDI, we are like a normal
* 1-1 bridge.
*/
ast_assert(bridge->tech_pvt != NULL);
/* Recheck native bridging validity. */
tech_pvt = bridge->tech_pvt;
switch (frame->frametype) {
case AST_FRAME_VOICE:
case AST_FRAME_VIDEO:
if (!tech_pvt->connected) {
/* Don't try to start native mode on media frames. */
break;
}
if (native_bridge_changed(bridge)) {
native_request_stop(bridge);
native_request_start(bridge);
if (!tech_pvt->connected) {
break;
}
}
/*
* Native bridge handles voice frames in hardware. However, it
* also passes the frames up to Asterisk anyway. Discard the
* media frames.
*/
return 0;
default:
if (!tech_pvt->connected) {
native_request_start(bridge);
break;
}
if (native_bridge_changed(bridge)) {
native_request_stop(bridge);
native_request_start(bridge);
}
break;
}
return ast_bridge_queue_everyone_else(bridge, bridge_channel, frame);
}
static struct ast_bridge_technology native_bridge = {
.name = "native_dahdi",
.capabilities = AST_BRIDGE_CAPABILITY_NATIVE,
.preference = AST_BRIDGE_PREFERENCE_BASE_NATIVE,
.create = native_bridge_create,
.start = native_bridge_start,
.stop = native_bridge_stop,
.destroy = native_bridge_destroy,
.join = native_bridge_join,
.leave = native_bridge_leave,
.suspend = native_bridge_suspend,
.unsuspend = native_bridge_unsuspend,
.compatible = native_bridge_compatible,
.write = native_bridge_write,
};
/*!
* \internal
* \brief Destroy the DAHDI native bridge support.
* \since 12.0.0
*
* \return Nothing
*/
void dahdi_native_unload(void)
{
ast_bridge_technology_unregister(&native_bridge);
}
/*!
* \internal
* \brief Initialize the DAHDI native bridge support.
* \since 12.0.0
*
* \retval 0 on success.
* \retval -1 on error.
*/
int dahdi_native_load(const struct ast_channel_tech *tech)
{
dahdi_tech = tech;
if (ast_bridge_technology_register(&native_bridge)) {
dahdi_native_unload();
return -1;
}
return 0;
}
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