Re: [ecasound] what is wrong with this?

New Message Reply Date view Thread view Subject view Author view Other groups

Subject: Re: [ecasound] what is wrong with this?
From: Jeremy Hall (jhall@UU.NET )
Date: Thu Jan 13 2000 - 09:26:19 EET

well, I am not certain I fully understand this. Could you explain this a
little differently?

_J

In the new year, Kai Vehmanen wrote:
> On Mon, 10 Jan 2000, Jeremy Hall wrote:
>
> > -a:1,2 -i /tmp/in.raw -o /tmp/out.raw -a:1 -efl:120 -ev -a:2 -efh:120
> [...]
> > c-select 1
> > -ea:185
> [...]
> > c-select 1,2
> > -ev
> > although you can now c-select both channels, adding the effect seems to
> > only effect channel 1. I cannot apply two -ev effects because then I
>
> Yes, ability to add effects to multiple chains (at the same time) was
> removed in some early 1.6.x version. This has some API-level
> advantages. But it wouldn't help much, as ecasound's design doesn't
> allow chain operators to be connected to multiple chains.
>
> > would lose on things--music and movies etc are dynamic. I ned a -ev for
> > both channels, not two separate ones.
>
> This is actually part of a bigger design issue. Hardware mixing desks
> (which are emulated by many software audio packages) have two-stage
> mixing - input-stripes and buses. Ecasound on the other hand only has
> one stage of mixing. In most situations this is enough, and it makes
> the user-interface simpler and is usually faster.
>
> There are however a few things we can do without altering ecasound's
> current design:
>
> 1) Input/output looping
>
> ecasound -a:1 -i file1.wav -o cloop,3 -efh:120 \
> -a:2 -i file2.wav -o cloop,3 -efl:400
> -a:3 -i cloop,3 -o /dev/dsp -ev
>
> 2) Looping chain operators
>
> ecasound -a:1 -i file1.wav -o null -efh:120 -elf:1 \
> -a:2 -i file2.wav -o cloop,3 -efl:400 -elf:1 \
> -a:3 -i cloop,3 -o /dev/dsp -elt:1 -ev
>
> Both work in a similar fashion. Output is routed from chains 1 and 2
> to chain 3. First one is easier to implement, but looping causes
> latency (buffersize samples). Second one requires that chains are
> processed in the right order. This is a major setback as chains
> are currently fully independent (SMP systems, paraller processing).
>
> --
> Kai Vehmanen <kaiv@wakkanet.fi> -------- CS, University of Turku, Finland
> . http://www.wakkanet.fi/ecasound/ - linux audio processing
> . http://www.wakkanet.fi/sculpscape/ - ambient-idm-rock-... mp3/ra/wav
>
>

New Message Reply Date view Thread view Subject view Author view Other groups

This archive was generated by hypermail 2a24 : Thu Jan 13 2000 - 09:26:58 EET