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- Content .- Fans (48) . 

Impulse - PulseAudio visualizer

   0.5.5  

Screenlet

Score 81%
Impulse - PulseAudio visualizer
zoom


Impulse - PulseAudio visualizer
zoom


Impulse - PulseAudio visualizer
zoom


Homepage:  Link
Downloads:  58746
Submitted:  Feb 14 2009
Updated:  Dec 12 2010

Description:

Impulse is a bit of eye-candy for your desktop. It is a widget that displays a graphical spectrum analyzer on your gnome desktop. It is written in c and python and uses GTK and cairo graphics to generate the animation. the impulse library creates a pulse audio connection context that reads the output stream from pulseaudio in a thread natively which can then be read from python. You can specify impulse to either output the raw stream or output the fft of the raw stream.


Requires:
screenlets 1.2
libfftw3-3
libpulse0


Install:
1) Download and extract Impulse.tar.bz2
2) mv Impulse ~/.screenlets/
then open up the screenlets manager and start Impulse or open screenlets manager and click Install, navigate to the Impulse.tar.bz2 archive and click ok.




Changelog:

Impulse 0.5.5
Fixed issue cause by latest Ubuntu update and added ability to change the audio source. Also updated the default theme.

Impulse 0.5.0
New structure. Themes now editable.

Impulse 0.2.4
Fixed screenlet menu bug and use a smarter way to identifying the pa monitor source.

Impulse 0.2.2
Added new screenlet themes

Impulse 0.2.0
Project is under a new name, Impulse. Now natively captures PulseAudio output source

Spectrolet 0.1.4:
Switched from ESOUND to Pulseaudio

Spectrolet 0.1.2:
Now preforms an fft on the audio stream

Spectrolet 0.1.0:
Now uses gtk.main correctly










LicenseGPL
(Impulse screenlet x86)
(Impulse screenlet x86_64)
(Impulse All)
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 Eh??

 
 by UbuntuLee on: May 28 2009
 
Score 50%

People like this? Its a little odd. Do you people just view your desktop all day? Desktops are rather worthless you know. Windows cover the desktop most of the time.


none
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 Re: Eh??

 
 by ianimal on: May 29 2009
 
Score 50%

Is your comment directed specifically towards this screenlet because your point of view really applies to all screenlets as being worthless. The whole point of this concept is to be unobtrusive. There is no reason to have Impulse in your face all the time since it is just something cool and interesting rather than functional. And it all depends on how you set up your desktop and whether you keep windows always maximized or not. For instance I have a dock on the bottom and put Impulse in the bottom left corner. Even maximized windows do not cover that space where the dock, and Impulse, and another screenlet showing the current song being played are. And yes I think most people do like it, or are at least intrigued by it considering it is currently the highest rated submission on this website. So by odd, I assume you mean different and original? Free yourself from the constructs of the window...


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 =D

 
 by F0R2AKEN on: Jun 7 2009
 
Score 50%

ianimal...i love you


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 Brilliant !!

 
 by peacewithall on: Jun 8 2009
 
Score 50%

Haha, this is brilliant, thanks so much for this !!.


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 love it

 
 by hugoreyes on: Jun 8 2009
 
Score 50%

best thing ever made
it uses a *bit* much cpu


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 Re: love it

 
 by ianimal on: Jun 10 2009
 
Score 50%

Thank you. Yes it does use some CPU. On my system its an average of 6% while playing audio and 2% without music. Since impulse needs to perform an fft on the audio stream which is O( n*log(n) ) and at 30 frames a second its expensive. I have thought about offloading the fft to the GPU using something like OpenCL (http://en.wikipedia.org/wiki/OpenCL) which might be able to cut the CPU load in half if it works!


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 Re: Re: love it

 
 by duron23 on: Nov 10 2010
 
Score 50%

Did you managed to rewrite this screenlet using pyopencl ??

This screenlet is a one hack of a fun screenlet


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 cpu usage

 
 by romtrack on: Jun 11 2009
 
Score 50%

thx ianimal :)
that is cool :D
But is it normal that my cpu is use a 50 %? I have put 100 colonnes and that is all.
I have some other screenlet but when I turn off impulse my cpu usage is about 4 % thx for answering


romtrack
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 Re: cpu usage

 
 by romtrack on: Jun 11 2009
 
Score 50%

I am wrong it use more or less 33 %


romtrack
Reply to this

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 Re: Re: cpu usage

 
 by ianimal on: Jun 14 2009
 
Score 50%

As I mentioned above Impulse performs an FFT on the audio stream at 30 fps, redraws the animation at 30 fps, and the PulseAudio system doesn't have the greatest performance track record...as a result Impulse takes some CPU usage. I have a fast dual core which is why my CPU is at 6%, which, if I had a single core would automatically jump to 12%. If your system is twice as less powerful as mine and has a single core it could easily slip up to your aforemetioned 30%. All of the heavy processing is done in C (natively) and is as fast as it can get. The best option I have is to offload the fft to the GPU. Also a cairo graphics backend that utilizes the GPU would also help.


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 Re: Re: Re: cpu usage

 
 by romtrack on: Jun 14 2009
 
Score 50%

thx for your answer. My cpu is a dual core too a 3.6ghz but that is maybe I have compiz and some other screenlet but anyway that is a fun screenlet :D


romtrack
Reply to this

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 OSS 4.1

 
 by malcom666 on: Jun 16 2009
 
Score 50%

I suppose this might sound like a dumb question but:

I use OSS 4.1 as it provides the best sound output and utilises my hardware better, I have removed ALSA and Pulse will I be able to get this screenlet to work?

It installs and loads fine, it just does not move, I have the required files installed, so I guess it is that I am not using pulse audio - is this correct?

Thanks


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 Re: OSS 4.1

 
 by ianimal on: Jun 19 2009
 
Score 50%

Impulse only works with PulseAudio unfortunately. I chose PulseAudio because it seems to be the most popular and the one that I use. I don't know if it would be possible to do with OSS, it would take some time and research to figure out. Unfortunately I probably won't do it unless I get enough request for OSS support.


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 Re: OSS 4.1

 
 by ianimal on: Jun 20 2009
 
Score 50%

So i've looked more into OSS 4.1 over the past few days and am very impressed. I installed it on my laptop to test it out and it is great, so much better than PulseAudio and I hope the Ubuntu team will drop PulseAudio as the default and switch over to OSS. I did a bit of research into capturing the mixed audio using OSS and I think i've got a good direction. When I get some free time I am going to try and port Impulse to OSS.


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 Re: Re: OSS 4.1

 
 by malcom8257 on: Jun 24 2009
 
Score 50%

Hi, thanks for your reply, I have switched back to ALSA / Pulse and the screenlet works just fine. I was having issues with OSS 4.1 anyway - the system and application sounds did not work so I thought what the hell!


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