patriciogonzalezvivo / sigmundanalyzer

sigmundAnalyzer

Real-time audio spectrogram to loopback v4l

Installation

You will need to install the following dependencies:

• v4l2LoopBack this is not require to compile but is crucial for sigmund to stream the data to a video device
• FFTW3
• Alsa
• Liblo

Assuming an ubuntu linux system you shuld install those dependencies doing this:

sudo apt-get install libfftw3-dev libasound2 libasound2-dev v4l2loopback-dkms v4l2loopback-utils liblo-dev

Clone, compile and install:

git clone https://github.com/patriciogonzalezvivo/sigmundAnalyzer.git
cd  sigmundAnalyzer
make
sudo make install

Usage

First you need to create a v4l2loopback device.

// Create a loopback video device in /dev/video9
sudo modprobe v4l2loopback video_nr=9 card_label="loopback"

// Check that is there
ls /dev/video*

Then you can run the program pointing that device as destination:

sigmund --spectogram /dev/video9

Then you can use GlslViewer to read from /dev/video9 and visualize the data as you prefere:

// As a regular FFT bars
glslViewer shaders/bars.frag /dev/video9 -l 


// Waterfall 
glslViewer shaders/waterfall.frag /dev/video9 -l 

TODO

• Add octave analizer, beat detection
• Add OSC for less often data... like octaves peaks and avarage

sigmundanalyzer's Issues

Error opening PCM device plughw:0,0

ok, so I have the kernel headers installed! (that was a headache, hahaha)

first i run

sudo modprobe v4l2loopback video_nr=9 card_label="loopback"

then

sigmund --spectogram /dev/video9

and then I get the output:

Analazing 1024 frequency bands each one of 5.3833Hz
Error opening PCM device plughw:0,0

I think I just need to have it look at plughw:0,1 and not 0,0 ..... but I could be wrong. any way to check/change/set that value when calling sigmund?