Re: [ecasound] Using ecasound without input?

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Subject: Re: [ecasound] Using ecasound without input?
From: S. Massy (theanaloguekid@tak.net.dhis.org)
Date: Sun Apr 01 2001 - 09:53:40 EEST

You absolutely have to specify at least an input/output for a chain to be
valid. However the null i/o object does just what you need. For
instance, using the metronome would be:
$ ecasound -i:null -o:/dev/dsp -el:metronome,bpm

Hope this helps,
S. Massy
 

On Sun, 01 Apr 2001, Nolan Darilek wrote:

> A few Ecasound options and LADSPA plugins seem to be intended for
> creating sound, not modifying input. For example, the metronome preset
> in the global effect presets list generates beeps and doesn't really
> need audio input. I also have a white noise LADSPA plugin which I
> wanted to use in some of my projects, and this shouldn't require any
> audio input.
>
> Is it somehow possible to use these options without inputs? If I do
> something like:
>
> ecasound -c
> ecasound ('h' for help)> -pn:metronome
> - [ Chainsetup/Adding LADSPA-plugin "Sine Oscillator (Freq:control, Amp:control)" ]
> Setting parameters: Frequency (Hz) = 880.00, Amplitude = 1.00
> - [ Chainsetup/Adding chain operator "Pulse gate BPM" ] --------------------
> (audiofx_envelope_modulation) WARNING! Frequency must be greater than 0!
> Setting parameters: bpm = 120.00, on-time-msec = 10.00
> - [ Chainsetup/Adding chain operator "Lowpass filter" ] --------------------
> Setting parameters: cutoff-freq = 2000.00
> (audiofx_envelope_modulation) WARNING! Frequency must be greater than 0!
> bpm = 120.00
> ecasound ('h' for help)> start
> (eca-control) ERROR: Warning! Selected chainsetup cannot be connected. Can't perform requested action.
>
> If I load a sound file then the metronome works, but this is kinda
> strange. So I'm wondering if there is some way to use the metronome
> and set the BPM without loading an audio file, since adding a file
> requires me to then load the metronome, set the BPM, decide how many
> seconds of the audiofile to loop over so that the required BPM is
> maintained, etc.
>
> Thanks.
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