[ecasound] how to use ecasound in pipe?

From: Milos Wimmer <wimmer@email-addr-hidden>
Date: Sat Oct 11 2008 - 02:17:31 EEST


at first, please excuse my stupid question...

I would like to stream live ADAT data from my RME Hammerfall HDSP card to
FLAC. Because I have lot of different channels in ADAT, I need to split
them and so I'm using JACK audio server. JACK works fine for me.
Problem is that I don't know any working FLAC stream producer with JACK
input module. New version of vlc supports it, but jack_access input module
is broken :-(
So my idea was to use some JACK reader/connector which can sent WAV data
to its standard output and then to use 'vlc' which will read these WAV
data on its standard input and will transcode them to FLAC stream (and
will be work as a server for clients too).
I mean this:

  ADAT/RME --> JACK --> reader_from_jack_to_WAV | vlc <--- clients

I tried to use ecasound as a 'reader_from_jack_to_WAV' component.
But I don't know how to set it for producing WAV data on its standard

When I type:
  ecasound -i ... -o:sndfile,-,wav > /tmp/output.wav
in first step, it is ok, I have output.wav file in WAV
and when I type:
  cat /tmp/output.wav | vlc ....
in second step, it is ok too, vlc produces output FLAC stream.

But I need to use them both together in pipe. In this case:

  ecasound -i ... -o:sndfile,-,wav | vlc

does not work.
In fact -
  ecasound -i ... -o:sndfile,-,.wav | cat > /tmp/output.wav

ERROR: Connecting chainsetup failed: "Enabling chainsetup:
AUDIOIO-SNDFILE: Can't open file "-" for updating (read/write)."

  ecasound -i ... -o:stdout,.wav | cat > /tmp/output.wav

writes data in raw format (probably) to output file.

Please - could I use ecasound with WAV on standard output in pipe?

I will appreciate any other idea how to solve my problem
or recommendation to other readers/producers too ;-)

Thank you very much for your help,



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Received on Sat Oct 11 04:15:01 2008

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