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<head><title>Bluetooth-alsa</title></head>
<body>
<p>
<h1>Bluetooth-alsa</h1>
Bluetooth audio for Linux
<p>
<a href="index.html">Overview</a>
| <a href="history.html">History</a>
| <b>Future work</b>
| <a href="build.html">Download & build</a>
| <a href="credits.html">Credits</a>
| <a href="contact.html">Contact us</a>
<hr>
There are still limitations in the architecture that make complete
desktop or handheld integration impossible. In particular, audio applications
should not have to be individually configured back and forth between wired
and wireless audio. We want a VOIP call in progress to be able to be
easily switched to and away from a headset, another complicated interaction.
<h3>D-Bus</h3>
The BlueZ team has recently taken the approach to integrate with the desktop
using the desktop bus. This allows for messages to the user to indicate
for example when a bluetooth adapter becomes available or a new connection
needs to be authorized.
<p>
D-Bus holds a lot of promise for dynamically routing audio between
combinations of built-in and bluetooth audio.
<h3>Advanced architecture</h3>
The design in progress involved merging SCO and A2DP devices from the
application's point of view so there is a single default system-wide
audio device.
<p>
Connection management and advanced controls like AVRCP are communicated
using D-Bus and, optionally and to a lesser extent, the uinput device.
<br><center><img src="sound-of-bluez.png"></center>
<h3>D-Bus proposed API</h3>
<pre>
Audio hierarchy (experimental)
==============================
Service org.bluez
Interface org.bluez.Audio
Object path /org/bluez
Methods array{string} ListHeadsets()
Returns list of headset object paths under /org/bluez
string FindHeadset(string pattern)
Returns object path for the specified headset. Valid
patterns are eg "Headset0" or "00:11:22:33:44:55" or
"00:11:22:33:44:55|duplex" or "00:11:22:33:44:55|HFP"
Signals void HeadsetAdded(string path)
Parameter is object path of added headset.
void HeadsetRemoved(string path)
Parameter is object path of removed headset.
Headset hierarchy (experimental)
==============================
Service org.bluez
Interface org.bluez.Headset
Object path /org/bluez/{Headset0,Headset1,...}
Methods void Connect()
Opens the control connection to an audio device.
void Disconnect()
Stops audio if it was playing and closes the
control connection to the audio device.
void Play()
Opens the audio stream. Called from the audio
plugin or from the application if audio is
routed somewhere other than the daemon (eg
through PCM, direct to the DSP).
void Stop()
void Pause()
void Resume()
boolean GetDuplex()
Return true if this headset & profile support a
microphone.
void SetTimeout(uint32 timeout)
Set the idle Stop for the device.
Stop the stream and emit a signal if
timeout elapses without any audio being sent
to the headset from an application. A value of 0
indicates no idle stop; this is the default.
uint32 GetTimeout()
uint16 GetSpeakerGain()
uint16 GetMicrophoneGain()
void SetSpeakerGain(uint16 gain)
Gain is 0..15
void SetMicrophoneGain(uint16 gain)
Gain is 0..15
void Ring()
Use one ring on the headset's builtin ringer
to indicate an incoming call.
void CustomRing()
Start the headset playing to indicate an
incoming call.
void CancelRinging()
Cancel ringing or custom ringing incoming call.
uint16 GetDelay()
Return the delay in ms from sending audio to
the set and when it is heard.
void SetDelay(uint16 delay)
Set the delay for this headset.
void AddBuiltInAudio()
Indicate that built-in audio should receive
the stream in addition to the headset.
The daemon only provides this state for use
by (eg) the alsa/gst plugin. The daemon does
not interact with built-in audio.
void RemoveBuiltInAudio()
Signals void Connected()
void Disconnected()
void Playing()
Audio stream was started.
void Stopped()
Audio stream was stopped.
void Paused()
Audio stream was paused.
void Resumed()
Audio stream was resumed.
void PlayRequested()
The headset requested the stream to (re)start.
void StopRequested()
The headset requested the stream to stop.
void PauseRequested()
The headset requested a pause in the stream.
void NextTrackRequested()
The headset requested the next track.
void PreviousTrackRequested()
The headset requested the previous track.
void Ringing()
An incoming call was indicated with a ring
on the builtin ringer.
void CustomRinging()
An incoming call is being indicated with
a custom ring tone.
void Canceled()
Incoming call was canceled.
void TimeoutChanged()
Idle disconnect timeout changed.
void SpeakerGainChanged(uint16 gain)
The speaker gain changed.
void MicrophoneGainChanged(uint16 gain)
The microphone gain changed.
void VoiceCommandRequested()
The headset requested a voice-command session.
void Redialed()
The headset requested a redial.
void Answered()
User tried to answer an incoming call.
void Rejected()
User tried to rejected an incoming call.
void DelayChanged(uint16 delay)
The delay value was changed for this set.
void BuiltInAudioAdded()
void BuiltInAudioRemoved()
</pre>
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