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bluez5: Add support for Broadcast links

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This adds support for BAP Broadcast transport links.

Unlike unicast, broadcast links are used by a BAP Broadcast Sink
device to link together multiple transports in the same BIG that
the user wants to start receiving audio from. Each transport is
associated with a different BIS, so each one has a different fd.
Thus, each link needs to be acquired and released separately.
This commit is contained in:
Iulia Tanasescu 2024-10-22 15:17:17 +03:00 • committed by P V
parent 7f885a2e94
commit b2a70f5933
1 changed files with 37 additions and 7 deletions
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44
spa/plugins/bluez5/bluez5-dbus.c
View file

@ -3455,6 +3455,9 @@ static int transport_update_props(struct spa_bt_transport *transport,
if (!check_iter_signature(&it[1], "ao"))
goto next;
spa_list_remove(&transport->bap_transport_linked);
spa_list_init(&transport->bap_transport_linked);
dbus_message_iter_recurse(&it[1], &iter);
while (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_INVALID) {
const char *transport_path;
@ -3684,21 +3687,32 @@ static void transport_acquire_reply(DBusPendingCall *pending, void *user_data)
transport_sync_volume(transport);
finish:
if (ret < 0)
if (ret < 0) {
spa_bt_transport_set_state(transport, SPA_BT_TRANSPORT_STATE_ERROR);
else {
/* For broadcast, skip handling links. Each link acquire
* is handled separately.
*/
if ((transport->profile == SPA_BT_PROFILE_BAP_BROADCAST_SINK) ||
(transport->profile == SPA_BT_PROFILE_BAP_BROADCAST_SOURCE))
return;
} else {
if (transport_create_iso_io(transport) < 0)
spa_log_error(monitor->log, "transport %p: transport_create_iso_io failed",
transport);
/* For broadcast the initiator moves the transport state to SPA_BT_TRANSPORT_STATE_ACTIVE */
/* For broadcast, each transport has a different fd, so it needs to be
* acquired independently from others. Each transport moves to
* SPA_BT_TRANSPORT_STATE_ACTIVE after acquire is completed.
*/
/* TODO: handling multiple BIGs support */
if ((transport->profile == SPA_BT_PROFILE_BAP_BROADCAST_SINK) ||
(transport->profile == SPA_BT_PROFILE_BAP_BROADCAST_SOURCE)) {
spa_bt_transport_set_state(transport, SPA_BT_TRANSPORT_STATE_ACTIVE);
} else {
if (!transport->bap_initiator)
spa_bt_transport_set_state(transport, SPA_BT_TRANSPORT_STATE_ACTIVE);
return;
}
if (!transport->bap_initiator)
spa_bt_transport_set_state(transport, SPA_BT_TRANSPORT_STATE_ACTIVE);
}
/* For LE Audio, multiple transport from the same device may share the same
@ -3758,6 +3772,13 @@ static int do_transport_acquire(struct spa_bt_transport *transport)
spa_autoptr(DBusMessage) m = NULL;
struct spa_bt_transport *t_linked;
if ((transport->profile == SPA_BT_PROFILE_BAP_BROADCAST_SINK) ||
(transport->profile == SPA_BT_PROFILE_BAP_BROADCAST_SOURCE))
/* For Broadcast, all linked transports need to be
* acquired independently, since they have different fds.
*/
goto acquire;
spa_list_for_each(t_linked, &transport->bap_transport_linked, bap_transport_linked) {
/* If a linked transport has been acquired, it will do all the work */
if (t_linked->acquire_call || t_linked->acquired) {
@ -3768,6 +3789,7 @@ static int do_transport_acquire(struct spa_bt_transport *transport)
}
}
acquire:
if (transport->acquire_call)
return -EBUSY;
@ -3862,10 +3884,17 @@ static int do_transport_release(struct spa_bt_transport *transport)
transport->iso_io = NULL;
}
/* For LE Audio, multiple transport stream (CIS) can be linked together (CIG).
/* For Unicast LE Audio, multiple transport stream (CIS) can be linked together (CIG).
* If they are part of the same device they reuse the same fd, and call to
* release should be done for the last one only.
*
* For Broadcast LE Audio, since linked transports have different fds, they
* should be released independently.
*/
if ((transport->profile == SPA_BT_PROFILE_BAP_BROADCAST_SINK) ||
(transport->profile == SPA_BT_PROFILE_BAP_BROADCAST_SOURCE))
goto release;
spa_list_for_each(t_linked, &transport->bap_transport_linked, bap_transport_linked) {
if (t_linked->acquire_call || t_linked->acquired) {
linked = true;
@ -3878,6 +3907,7 @@ static int do_transport_release(struct spa_bt_transport *transport)
return 0;
}
release:
if (transport->fd >= 0) {
close(transport->fd);
transport->fd = -1;