[ecasound] Re: Performing a play with high speed

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Subject: [ecasound] Re: Performing a play with high speed
From: Kai Vehmanen (kai.vehmanen_AT_wakkanet.fi)
Date: Tue Oct 30 2001 - 18:01:34 EET

Hi,

On Tue, 30 Oct 2001, openit_AT_libero.it wrote:

> I need to perform with ecasound a play with double speed, to simulate a
> forward/rewind operation.
>
> I need this feature to realize a mixer that can be used by a blind
> operator.
> This person needs to control the forward/rewind operation by listening
> the track output played faster ... Can ecasound do it?

at least a few people have answered your original mail to
ecasound-list. You can check the web archive at www.eca.cx if you didn't
catch all the replies. Anyway, the pitchshifter effect is probably the
closest choice. So something like:

ecasound -i file.wav -o /dev/dsp -ei:100 -c

# ecasound iactive-mode starts
ecasound ('h' for help)> start

# enable double-speed
ecasound ('h' for help)> cop-set 1,1,200

# back to normal speed
ecasound ('h' for help)> cop-set 1,1,100

... these commands can be send from a python/perl/C/C++ app using the ECI
interface or by piping commands to the console-mode ecasound.

Unfortunately double-speed rewind with audio output is not possible. You
have do a "offline rewind" (the "rewind" command). 

-- 
 http://www.eca.cx
 Audio software for Linux!

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