jeffjungletech
June 22nd, 2011, 08:55 PM
Problem which needs to be solved:
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Capture audio from multiple devices (on-board internal mic./line in, USB mic. etc...) and mux/merge into one stream/device. Plug'n'play support is also a must. (If a USB mic. is unplugged and another one is plugged in there must be a way by which to re'init the system so that it detects the changes).
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Must have's:
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System must be able to interface with java in such a way that using the java native TargetDataLine audio capture of the mixed/muxed/merged stream works. (Open to alternatives, byte stream (ByteBuffer) of captured audio data within java without using native TargetDataLine is an option)
OS: Ubuntu 10.10 (2.6.35-28-generic-pae #50-Ubuntu i686 GNU/Linux)
Java Version: latest
Approaches taken:
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JackD with JJack
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http://www.jackaudio.org/
http://jjack.berlios.de/
Issue, jjack client and *.so are not updated to use the latest jackD server. Using version one of jackD and related JJack, all audio captured within Java is silent. JackD has multiple x-runs, jjack and jackd don't connect.
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ALSA
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http://www.jrigg.co.uk/linuxaudio/ice1712multi.html
https://wiki.archlinux.org/index.php/Advanced_Linux_Sound_Architecture
http://alsa.opensrc.org/Udev
http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html#pcm_plugins_dmix
Issue, device wasn't ever setup due to configuration issues.
So, the next idea is to some how configure ALSA so that all 'capture'/input devices are place into one virtual card, after which, JACK is launched and told to use this new virtual card. Is this possible?
-=-=-=-=-=-=
Capture audio from multiple devices (on-board internal mic./line in, USB mic. etc...) and mux/merge into one stream/device. Plug'n'play support is also a must. (If a USB mic. is unplugged and another one is plugged in there must be a way by which to re'init the system so that it detects the changes).
-=-=-=-=-=-=
Must have's:
-=-=-=-=-=-=
System must be able to interface with java in such a way that using the java native TargetDataLine audio capture of the mixed/muxed/merged stream works. (Open to alternatives, byte stream (ByteBuffer) of captured audio data within java without using native TargetDataLine is an option)
OS: Ubuntu 10.10 (2.6.35-28-generic-pae #50-Ubuntu i686 GNU/Linux)
Java Version: latest
Approaches taken:
-=-=-=-=-=-=
JackD with JJack
-=-=-=-=-=-=
http://www.jackaudio.org/
http://jjack.berlios.de/
Issue, jjack client and *.so are not updated to use the latest jackD server. Using version one of jackD and related JJack, all audio captured within Java is silent. JackD has multiple x-runs, jjack and jackd don't connect.
-=-=-=-=-=-=
ALSA
-=-=-=-=-=-=
http://www.jrigg.co.uk/linuxaudio/ice1712multi.html
https://wiki.archlinux.org/index.php/Advanced_Linux_Sound_Architecture
http://alsa.opensrc.org/Udev
http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html#pcm_plugins_dmix
Issue, device wasn't ever setup due to configuration issues.
So, the next idea is to some how configure ALSA so that all 'capture'/input devices are place into one virtual card, after which, JACK is launched and told to use this new virtual card. Is this possible?