Subject: Re: [ecasound] future of qtecasound?
From: Jeremy Hall (jhall@UU.NET)
Date: Fri May 05 2000 - 20:53:18 EEST
yes, your inet example I have thought of before.
The problem I am attempting to solve is this:
If one has the ecasound already running, without these mods, one has te
restart it. Not to mention the inconvenience, an interruption of service
would result. I want to be able to modify the behavior of an already
running ecasound, even though it is running in the background. It is also
not possible to run ecasound in a pipe when trying to run it in
interactive mode.
_J
In the new year, Kai Vehmanen wrote:
> On Thu, 4 May 2000, Jeremy Hall wrote:
>
> > How difficult would it be to write two new interfaces, 1: make a socket in
> > /var/run/ecasound.$$
> > 2: bind at a port if the -p or some such option exists.
>
> This is quite easy. And actually, you can already do this:
>
> /etc/inetd.conf:
> --cut--
> ecasound stream tcp nowait root /usr/sbin/tcpd /usr/local/bin/ecasound -c
> --cut--
>
> /etc/services:
> --cut--
> ecasound 500/tcp
> --cut--
>
> Then I can use ecasound from my other machine:
>
> --cut--
> `--> ~ # telnet ecabase 500
> Trying 192.168.0.2...
> Connected to ecabase.
> Escape character is '^]'.
> ****************************************************************************
> * ecasound v1.7.8d12 (C) 1997-2000 Kai Vehmanen *
> ****************************************************************************
> (eca-session) Interactive mode enabled.
> ecasound ('h' for help)> aio-add-input /empty1/track04.wav
> aio-add-input /empty1/track04.wav
> (eca-controller) Added audio input "/empty1/track04.wav".
> ecasound ('h' for help)>
> ecasound ('h' for help)> aio-add-output
> aio-add-output
> (eca-controller) Added audio output "/dev/dsp".
> (eca-controller) Added default output to selected chains.
> ecasound ('h' for help)>
> [...]
> ecasound ('h' for help)> q
> q
> - [ Engine/Exiting ]
> -------------------------------------------------------
> Connection closed by foreign host.
> --cut--
>
> Isn't UNIX great? :) However, for local use, it's just as easy to
> fork ecasound on the background (using interactive-mode) and redirect
> ecasound input and output streams. This way you get two normal
> file descriptors. One for sending ia-mode commands, and one for
> parsing ecasound's output. 1.7.x version of ecasound also supports
> additional dump-commands, that are really useful for these purposes.
>
> > 1: a client can connect to a socket on a local machine with standard unix
> [...]
> > socket would not be created. This allows a front-end program to drive
> > ecasound easily by sending/receiving on a pipe, rather than having to
> > launch a new one.
>
> Hmm, what I described above (fork + dup()), is just as easy. I'm
> not sure how various scripting languages (Python, Perl, Guile, others)
> handle these...?
>
> > 2: bind to a port: If a cli program is running on a remote machine, it may
> > wish to talk to an ecasound running on this machine. Make it use
> > hosts.allow/hosts.deny or some such. I'll write up the RFC describing the
>
> How about my inetd solution? I admit it's a bit of a hack, but it does
> just what you describe.
>
> > protocol. In this way, interactive mode might be able to be removed
> > completely from ecasound and moved to ecacli, ecasound becomes ecasoundd
>
> Btw; ecasound's ia-mode is implemented on the library
> level. Due to this, console-mode ecasound is very, very simple. It
> reads user input using GNU readline (which provides the
> command-line history) and sends everything to the library. This means,
> that ia-mode can be used in all ecasound-based apps.
>
> --
> Kai Vehmanen <k@eca.cx> ---------------- CS, University of Turku .
> . audio software for linux .. http://www.eca.cx .
> . armchair-tunes mp3/wav/ra . http://www.wakkanet.fi/sculpscape .
>
>
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