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bluez5: report latency to rendering when in A2DP sink role

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Now that BlueZ supports delay reporting in A2DP sink role, implement
that.

Report value that gives the total latency between packet reception and
audio rendering.

Also make Latency parameter in media-source to be not just a dummy
value.
This commit is contained in:
Pauli Virtanen 2024-11-29 19:44:31 +02:00
parent 7bc84305e6
commit 2847d90b4b
4 changed files with 159 additions and 17 deletions
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36
spa/plugins/bluez5/bluez5-dbus.c
View file

@ -3987,12 +3987,48 @@ static int transport_release(void *data)
return do_transport_release(data);
}
static int transport_set_delay(void *data, int64_t delay_nsec)
{
struct spa_bt_transport *transport = data;
struct spa_bt_monitor *monitor = transport->monitor;
DBusMessageIter it[2];
spa_autoptr(DBusMessage) m = NULL;
uint16_t value;
const char *property = "Delay", *interface = BLUEZ_MEDIA_TRANSPORT_INTERFACE;
if (!(transport->profile & SPA_BT_PROFILE_A2DP_DUPLEX))
return -ENOTSUP;
value = SPA_CLAMP(delay_nsec / (100 * SPA_NSEC_PER_USEC), 0, 10 * UINT16_MAX);
if (transport->delay_us == 100 * value)
return 0;
transport->delay_us = 100 * value;
m = dbus_message_new_method_call(BLUEZ_SERVICE, transport->path, DBUS_INTERFACE_PROPERTIES, "Set");
if (m == NULL)
return -ENOMEM;
dbus_message_iter_init_append(m, &it[0]);
dbus_message_iter_append_basic(&it[0], DBUS_TYPE_STRING, &interface);
dbus_message_iter_append_basic(&it[0], DBUS_TYPE_STRING, &property);
dbus_message_iter_open_container(&it[0], DBUS_TYPE_VARIANT, DBUS_TYPE_UINT16_AS_STRING, &it[1]);
dbus_message_iter_append_basic(&it[1], DBUS_TYPE_UINT16, &value);
dbus_message_iter_close_container(&it[0], &it[1]);
if (!dbus_connection_send(monitor->conn, m, NULL))
return -EIO;
spa_log_debug(monitor->log, "transport %p: set delay %d us", transport, 100 * value);
return 0;
}
static const struct spa_bt_transport_implementation transport_impl = {
SPA_VERSION_BT_TRANSPORT_IMPLEMENTATION,
.acquire = transport_acquire,
.release = transport_release,
.set_volume = transport_set_volume,
.set_delay = transport_set_delay,
};
static void media_codec_switch_reply(DBusPendingCall *pending, void *userdata);