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Re: How to capture the audio of an output device in OSX
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Re: How to capture the audio of an output device in OSX

  • Subject: Re: How to capture the audio of an output device in OSX
  • From: claudio santoro <email@hidden>
  • Date: Wed, 10 Sep 2014 15:08:03 +0200
Thank you Paul,

I just took the doc inside "https://dl.dropboxusercontent.com/u/28869550/jack-1.9.10.tar.bz2".

I tried to compile it with xCode but I got a missing include file error and honestly I didn't spend too much time to figure out the problem.

Given that I'm already late with my schedule I think I will try to forward the input line stream.

I already asked (and perhaps tonite I will give it a try): does anybody know whether I can just overlap the input buffer stream with the output buffer stream? Are they "flat" flows or are there timed frames inside?

Thanx a lot to all.

Dodo





On Wed, Sep 10, 2014 at 1:42 PM, Paul Davis <email@hidden> wrote:


On Wed, Sep 10, 2014 at 12:12 AM, Dodo <email@hidden> wrote:

Hi all,


reading the doc of Jack, i find:

"- New Mac Intel use 2 different CoreAudio device for input/output. Jackdmp cannot directly handle 2 devices to do duplex processing. An "aggregate" device has to be built in this case. 
Use the "/Applications/Utilities/Audio MIDI Setup" tool to build and aggregate device that combine both input and output in a single duplex device, then select it when launching jackdmp, with something like :
….
….
jackdmp -R -d coreaudio -n "~:Aggregate:0"

or directly with the JackPilot tool. 
"


So, it seems to me that Jack uses an aggregate device to carry out its task….and I’m not cool with that.

This is out of date documentation. JACK creates an aggregate device programmatically when necessary.

Perhaps you are not aware that since the switch to Intel, Apple has *never* presented the builtin audio chipset as a single duplex device. Thus applications that have duplex behaviour have to either handle two different devices or use an aggregate **if they want to use the builtin audio chipset**.

Pro- and prosumer (in fact, almost any USB or Firewire) audio interfaces do not behave this way - they appear as single duplex-capable devices.
 

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  • Follow-Ups:
    • Re: How to capture the audio of an output device in OSX
      • From: Paul Davis <email@hidden>
References: 
 >How to capture the audio of an output device in OSX (From: claudio santoro <email@hidden>)
 >Re: How to capture the audio of an output device in OSX (From: Frederic De Jaeger <email@hidden>)
 >Re: How to capture the audio of an output device in OSX (From: Zack Morris <email@hidden>)
 >Re: How to capture the audio of an output device in OSX (From: Paul Davis <email@hidden>)
 >Re: How to capture the audio of an output device in OSX (From: Dodo <email@hidden>)
 >Re: How to capture the audio of an output device in OSX (From: Paul Davis <email@hidden>)

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