| ORG.BLUEZ.MEDIATRANSPORT(5) | Linux System Administration | ORG.BLUEZ.MEDIATRANSPORT(5) |
NAME¶
org.bluez.MediaTransport - BlueZ D-Bus MediaTransport API documentation
INTERFACE¶
- Service
- org.bluez
- Interface
- org.bluez.MediaTransport1
- Object path
- [variable prefix]/{hci0,hci1,...}/dev_XX_XX_XX_XX_XX_XX/fdX
Methods¶
fd, uint16, uint16 Acquire()¶
Acquire transport file descriptor and the MTU for read
and write respectively.
Possible Errors:
fd, uint16, uint16 TryAcquire()¶
Acquire transport file descriptor only if the transport
is in "pending" state at the time the message is received by BlueZ.
Otherwise no request will be sent to the remote device and the function will
just fail with org.bluez.Error.NotAvailable.
Possible Errors:
void Release()¶
Releases file descriptor.
void Select()¶
Applicable only for transports created by a broadcast
sink. This moves the transport from 'idle' to 'broadcasting'. This allows the
user to select which BISes he wishes to sync to via a 2 step process: 1) the
user calls the method, changing the transport's state to broadcasting 2) the
audio server detects that the transport is in the 'broadcasting' state and
automatically acquires it
Possible Errors:
void Unselect()¶
Applicable only for transports created by a broadcast
sink. This moves the transport from 'broadcasting' or 'active' to 'idle'. This
allows the user to terminate the sync to a BIS to via a 2 step process: 1) the
user calls this method, changing the transport's state to idle 2) the audio
server detects this event and releases the transport
Possible Errors:
Properties¶
object Device [readonly]¶
Device object which the transport is connected to.
string UUID [readonly]¶
UUID of the profile which the transport is for.
byte Codec [readonly]¶
Assigned number of codec that the transport support. The
values should match the profile specification which is indicated by the
UUID.
array{byte} Configuration [readonly]¶
Configuration blob, it is used as it is so the size and
byte order must match.
string State [readonly]¶
Indicates the state of the transport. Possible values
are:
- "idle"
- not streaming
- "pending"
- streaming but not acquired
- "broadcasting"
- streaming but not acquired, applicable only for transports created by a broadcast sink
- "active"
- streaming and acquired
uint16 Delay [readwrite, optional]¶
Transport delay in 1/10 of millisecond, this property is
only writeable when the transport corresponds to a sink endpoint and it was
acquired by the sender.
uint16 Volume [readwrite, optional]¶
Indicates volume level of the transport, this property is
only writeable when the transport was acquired by the sender.
Possible Values: 0-127
object Endpoint [readonly, optional, experimental]¶
Endpoint object which the transport is associated
with.
uint32 Location [readonly, ISO only, experimental]¶
Indicates transport Audio Location.
array{byte} Metadata [readwrite, ISO Only, experimental]¶
Indicates transport Metadata.
array{object} Links [readonly, optional, CIS only, experimental]¶
Linked transport objects which the transport is
associated with.
array{object} Links [readwrite, BIS only, experimental]¶
For a Broadcast Sink, the BIG sync procedure requires all
desired streams to be enumerated from the start and it cannot be later
reconfigured by adding or removing BISes. To avoid terminating and recreating
the BIG sync everytime a new transport is selected for acquire, all transports
selected via Transport.Select need to be linked together. When the first
transport is acquired via Transport.Acquire, all links are included in the BIG
sync command. An acquired transport will create and set fds for all its links.
Then, each link needs to be acquired separately, to get the fd and start
receiving audio.
dict QoS [readwrite, optional, ISO only, experimental]¶
Only present when QoS is configured.
Possible values for Unicast:
- byte CIG
- Indicates configured CIG.
Possible values:
- 0x00 - 0xef
- Valid ID range.
- 0xff
- Auto allocate.
- byte CIS
- Indicates configured CIS.
Possible values:
- 0x00 - 0xef
- Valid ID range.
- 0xff
- Auto allocate.
- byte Framing
- Indicates configured framing.
Possible values:
- 0x00
- Unframed.
- 0x01
- Framed.
- uint32 PresentationDelay
- Indicates configured transport presentation delay (us).
- byte TargetLatency
- Indicates the requested target latency.
Possible values:
- 0x01
- Low Latency.
- 0x02
- Balanced Latency/Reliability.
- 0x03
- High Reliability.
Possible values for Broadcast:
- byte BIG
- Indicates configured QoS BIG.
- byte BIS
- Indicates configured BIS.
- byte SyncFactor
- Indicates configured broadcast sync factor.
- byte Packing
- Indicates configured packing.
- byte Framing
- Indicates configured framing.
- array{byte} BCode
- Indicates the string used for encryption/decryption.
- byte encryption
- Indicates if the stream is encrypted.
- byte Options
- Indicates configured broadcast options.
- uint16 Skip
- Indicates configured broadcast skip.
- byte SyncTimeout
- Indicates configured broadcast sync timeout.
- byte SyncType
- Indicates configured broadcast sync CTE type.
- byte MSE
- Indicates configured broadcast MSE.
- uint16 Timeout
- Indicates configured broadcast timeout.
Possible values for both Unicast and Broadcast:
- uint32 Interval
- Indicates configured ISO interval (us).
- uint16 Latency
- Indicates configured transport latency (ms).
- uint16 SDU
- Indicates configured maximum SDU.
- byte PHY
- Indicates configured PHY.
Possible values:
- byte Retransmissions
- Indicates configured retransmissions.
| July 2024 | BlueZ |