alsasrc -> deinterleave (to multiple mono's) -> interleave (mono pairs to stereo) -> encodebin/standalone encoders/muxers -> multifilesink (splits output into multiple sequential files).
This is the basic pipeline (I left out queue's you'd need for multithreading etc.), but it should be a pretty decent way of doing what you're asking.
Alex.
On Thu, 2 May, 2013 at 6:52 PM, Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:
On Thu, 2 May 2013, Vincent Gulinao wrote:Hi everyone, I have a task to setup a system that will continuously capture multiple stereo signals using a MADI audio card (RME HDSPe MADI) and write them into files (perhaps in 1 hour chunks). Few checks I've learned while googling on the topic looks like that my linux setup seem to recognize the card at least."Multiple Stereo signals" means what? I have no idea about the MADi interface or how alsa supports it. But if it does, it may be as simple as arecord -Dhw:0 -c 18 -r 48000 -f SB24_LE output.wav which would keep recording forever into output.wav. You could also use the -d 3600 to tell it to record for exactly an hour. You would then have to have a script to restart it to a different output file, but would miss a bit of the stream because of the time to stop and restart. I vaguely recall a recording program that will automatically dump into a new file every x secods, presumably not missing anything, but cannot remember it now. (Note the above tells arecord to use the hardware input, not put it through a filter like rate changing etc, tells it you want 18 channels, a rate of 48000 samples per sec on each channel, and the input is in 24 bit format with Low Order byte order.I'm a total noob in ALSA and audio concepts in general. I've read many docsIf you told us what you were trying to do, someone could probably offer better advice. Note that the above assumes that you alsa does support the card without problems and the card is card 0 on your system.and forums (e.g. arecord, asoundrc, pulseaudio, jack, etc.) here and there. But while I wait all those info settle in my mind, can somebody pitch here some high-level hints on what things I need to know, or what sort of questions should I be asking, to accomplish this task and make sure I'm on the right direction? Thanks in advance!--William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273 Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324 UBC, Vancouver,BC | Program in Cosmology | unruh@xxxxxxxxxxxxxx Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/ ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
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