Re: [Bluez-devel] audio & dbus

[Fabien Chevalier <fabchevalier@free.fr>]

Hi Marcel & Brad, please find a few questions below:

> Hi Brad,
> 
>> fwiw, I'm not sure how to break away from the need to specify the 
>> profile for the case of a combo a2dp/sco device.
> 
> I am still not convinced that we need to do this kind of things, 

Marcel, what do you mean by 'this kind of things' ?

but if
> you really wanna separate this, then we need a more general approach. In
> case of A2DP it can happen that we have two or even more independent
> channels (I know that no such device exists at the moment).
> 
> So what you need is some kind of capabilities command and then you can
> use this to create instances for all devices. So my proposal would be
> that we use org.bluez.Audio as a configuration interface (like Manager)
> and then org.bluez.Headset to actually connect, disconnect etc.
> 
>> Audio hierarchy (experimental)
>> ==============================
>>
>> Service		org.bluez
>> Interface	org.bluez.Audio
>>
>> Methods		array{string} ListDevices()
>>
>> 			Return array of bdaddr strings for each audio
>> 			device we have paired with.
>>
>> 		void Connect(string identifier, string profile)
>>
>> 			Opens the control connection to an audio device.
>> 			Will not open the audio channel until requested
>> 			by the audio plugin or directly from the
>> 			application.
>>
>> 		void Disconnect(string identifier, string profile)
>>
>> 			Stops audio if it was playing and closes the
>> 			control connection to the audio device.
>>
>> 		void Play(string identifier, string profile)
>>
>> 			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(string identifier, string profile)
>>
>> 		void Pause(string identifier, string profile)
>>
>> 		void Resume(string identifier, string profile)
>>
>> 		void SetIdleDisconnect(string identifier, string profile, int32 delay)
>>
>> 			Set the idle Stop for the device.
>>
>> 			Only applicable when audio is routed through the
>> 			daemon. Stop the stream and emit a signal if
>> 			delay seconds pass without any audio being sent
>> 			to the daemon from an application. A value of 0
>> 			indicates no idle stop; this is the default.
>>
>> 		int32 GetIdleDisconnect(string identifier, string profile)

Brad : How are we supposed to handle the case when an application 
crashes while sending audio data ? Will he have to keep the audio 
channel opened forever ?


> 
> Timeouts must be in uint32 and name them "timeout". Delay would be used
> in case a process is sent to sleep.
> 
>> 		int32 GetVolume(string identifier, string profile)
>>
>> 		void SetVolume(string identifier, string profile, int32 volume)
>>
>> 			Volume is 0..15
> 
> And for what reason is this int32. First of all it must be unsigned and
> 16-bit seem to be enough.
> 
>> 		void ChangeVolume(string identifier, string profile, int16 delta)
>>
>> 			delta is +1 or -1
> 
> No. Use IncreaseVolume and DecreaseVolume.
> 
>> 		void AddWiredVoice()
>>
>> 			Add wired audio output to the voice routing rule
>>
>> 		void RemoveWiredVoice()
>>
>> 			Remove wired audio output from the voice routing
>> 			rule
> 
> Not needed at all. This is not our business and the PCM routing will be
> a parameter to the daemon. No need to support PCM and HCI routing at the
> same time.

Marcel, could you provide details on all this PCM routing stuff ?
ALSA already has support for routing aufio through the use of audio plugins.
Maybe it's a bit redundant ?

Cheers,

Fabien

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