[LAU] Jack users - how many channels do you want with PA module-jackdbus-detect?

[Patrick Shirkey]

On Wed, February 27, 2013 11:54 pm, Mac wrote:
>>
>> Message: 13
>> Date: Tue, 26 Feb 2013 14:21:22 -0800
>> From: "Len Ovens" <len at ovenwerks.net>
>> To: "Bearcat M. ????ndor"       <hometheater at feline-soul.com>
>> Cc: linux-audio-user at lists.linuxaudio.org
>> Subject: Re: [LAU] Jack users - how many channels do you want with PA
>>         module-jackdbus-detect?
>> Message-ID:
>>         <9f9bcd4e386e82d725192bbb97f70bdd.squirrel at ssl.ovenwerks.net>
>> Content-Type: text/plain;charset=iso-8859-1
>>
>>
>> On Tue, February 26, 2013 10:50 am, Bearcat M. ????ndor wrote:
>>> I assume that the channels can be anything we want and don't have to be
>>> based on ITU standards? I'm planning on playing with ambisonics
>>> sometime
>>> soon.
>>
>> Jack remains as is with whatever number of channels your audio interface
>> has. Pulse by default now will create the same number of channels as
>> well.
>> For a 10 channel card this is over doing things. Most uses of bridging
>> pulse to jack only require 2 channels (or even 1 for phone work). Jack
>> just calls channels 1, 2 ... to whatever. Pulse names them for surround
>> up
>> to 7.1 and then calls any extra aux1 etc. I do not know if pulse also
>> plays with the sound to add surround stuff or not. I have had one user
>> tell me it does... but I don't know.
>>
>> Personally, I would like to see the jack source/sink treated as a
>> device.
>> If the jack detect module is loaded then a device appears for it weather
>> jack is running or not. It should allow jack to be set up in the same
>> way
>> as a card, stereo, 5.1, 7.1. Input or output only etc. Then if jack does
>> show up that many lines are created. It really doesn't matter if the
>> device jack is talking to has more or even less channels than pulse sets
>> up.
>>
>> --
>> Len Ovens
>> www.OvenWerks.net
>>
>>
>>
>> ------------------------------
>>
>> Message: 14
>> Date: Tue, 26 Feb 2013 18:22:42 -0700
>> From: Bearcat M. ??ndor <hometheater at feline-soul.com>
>> To: linux-audio-user at lists.linuxaudio.org
>> Subject: Re: [LAU] Jack users - how many channels do you want with PA
>>         module-jackdbus-detect?
>> Message-ID:
>>         <CAMPo9soF=e-F1Y1Qg+phrxAmfN+nATPoavBnPNn4nncscD-ijA at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> I like that idea too Len, very much. Thanks for the in-depth answer too.
>>
>>
>> On Tue, Feb 26, 2013 at 3:21 PM, Len Ovens <len at ovenwerks.net> wrote:
>>
>>>
>>> On Tue, February 26, 2013 10:50 am, Bearcat M. ??ndor wrote:
>>> > I assume that the channels can be anything we want and don't have to
>>> be
>>> > based on ITU standards? I'm planning on playing with ambisonics
>>> sometime
>>> > soon.
>>>
>>> Jack remains as is with whatever number of channels your audio
>>> interface
>>> has. Pulse by default now will create the same number of channels as
>>> well.
>>> For a 10 channel card this is over doing things. Most uses of bridging
>>> pulse to jack only require 2 channels (or even 1 for phone work). Jack
>>> just calls channels 1, 2 ... to whatever. Pulse names them for surround
>>> up
>>> to 7.1 and then calls any extra aux1 etc. I do not know if pulse also
>>> plays with the sound to add surround stuff or not. I have had one user
>>> tell me it does... but I don't know.
>>>
>>> Personally, I would like to see the jack source/sink treated as a
>>> device.
>>> If the jack detect module is loaded then a device appears for it
>>> weather
>>> jack is running or not. It should allow jack to be set up in the same
>>> way
>>> as a card, stereo, 5.1, 7.1. Input or output only etc. Then if jack
>>> does
>>> show up that many lines are created. It really doesn't matter if the
>>> device jack is talking to has more or even less channels than pulse
>>> sets
>>> up.
>>>
>>> --
>>> Len Ovens
>>> www.OvenWerks.net
>>>
>>>
>
> I happen to agree. If there are x PA devices on my MOBO, I want to see
> x of them in JACK.
>
> I am one of the "few" mentioned in one post who have a 12 chan.
> firewire device as well as the devices on the mobo. I have a tri-amp'd
> stereo using a variety of JACK apps such as CALFrack and zita-lrx.
> (hopefully quad-amp'd and surround in the future)
>
> When I installed UBStudio 12.04 I was glad to see that PA just created
> the sink/sources in JACK and I didn't have to go figure something out.
> It's quite nice to be able to patch things around from the PA devices.
>
> I have yet to configure a surround sound system and have not seen
> anything showing up labeled as front, side rear, etc. (Is there a
> surround sound app? Do any of the apps that will play a dvd or bluray
> on a PC provide surround? Haven't attempted it yet, just askin.)
>

ffmpeg/libav and mencoder have support for 5.1 and 5.1e. vlc and other
apps that use those libs support 5.1 surround.

FYI, We are working on adding 5.1 output to jamin too.

> Also, if you set the default to stereo, how does it choose whether to
> use the jack (as in 3.5mm) on the front or the rear of the computer
> case?
>

You have to set the output volumes in a mixer app.


--
Patrick Shirkey
Boost Hardware Ltd