Öscillofun

[thelinx]

The amount of samples in a song basically defines how good the quality of the audio is. Usually, the sample rate is 44100 for regular CDs, meaning 44100 numbers between -1 and 1 per channel and second.

To visualise this song, I deduce a pixel position by taking a sample from the left channel as the X position and a sample from the right channel as the Y position.
Since the coordinates are (-1 < x < 1, -1 < y < 1), I need to decide where to put each point in the full window.

The finished position looks something like this: (getWidth() / 2 + getWidth() * x, getHeight() / 2 + getHeight() * y).

[BlackBulletIV]

But how do you get multiple pixels on the screen at the same time? How do you know how many samples to draw per frame?

EDIT: Oh, you probably use dt to decide the number of samples.

[thelinx]

It's open source

[BlackBulletIV]

Of course.

[DarkShroom]

thread ressurection warning

seriously i would really love to make a visualizer, how do you get this data into Love 2D?

[zorg]

thread ressurection warning

seriously i would really love to make a visualizer, how do you get this data into Love 2D?

0. Stop resurrecting dead threads, and open a new one
1. Create SoundData (Either empty or from a music file)
There, now the data is there, and you can access it with :getSample().
As for how to actually visualize things, that's up for the reader to figure out (There are tons of methods, even for just a plain and simple oscilloscope)
But let me post an image of one of the many projects i made in löve, albeit not yet released, to illustrate what's possible.

fft_stuff.png (858.6 KiB) Viewed 11128 times

[pgimeno]

Nice looking

That looks like a spectrogram! IMO spectrograms look sooo much nicer when the magnitude at each pixel is represented by a palette colour, preferably ranging from black through cold then warm colours, peaking at bright yellow or white e.g. https://www.youtube.com/watch?v=yzFit0nldf4

[zorg]

Nice looking

That looks like a spectrogram! IMO spectrograms look sooo much nicer when the magnitude at each pixel is represented by a palette colour, preferably ranging from black through cold then warm colours, peaking at bright yellow or white e.g. https://www.youtube.com/watch?v=yzFit0nldf4

Agreed, it would make more sense, but since i was coloring the sine-decomposition circles in the background, i didn't want the spectrogram to be too distracting... the upside is i know the perfect combination of blendmodes to clear one line every time, the downside is that it can only show 256 separate values since monochrome.

[logo4poop]

Can you reupload this?

[alejandroalzate]

anyone with a copy? i got a 404 for pretty much everything