tearing when flashing image to audio

[AutumnCheney]

here's another question i had

in my demo lib project, i have a background image with the brightness of the image connected to the demo audio, so that it flashes to the audio. however, it seems that the audio samples change too quickly for the image renderer, and these "tears" happen as a result

you can really see it here:



and here's what my code looks like (approximately):

Code: Select all

flash = abs(demo_sound_pcm_stream[demo_sound_pcm_stream_ptr * demo_sound_channels]) + 1)
pixi(cover, 0, 0, get_color(flash, flash, flash), ((demo_xsize / cover_xsize)), ((demo_xsize / cover_xsize)))

i'm trying to fix it by linearly interpolating the samples, but that doesn't get rid of it completely. i'm thinking about implementing some kind of downsampling or rms, but i don't know how to actually implement either of these

what can i do? thank you!

[NightRadio]

try something like
speed = 0.1 //from 0 (freeze) to 1 (max speed)
flash = flash * (1-speed) + next_value * speed

[AutumnCheney]

try something like
speed = 0.1 //from 0 (freeze) to 1 (max speed)
flash = flash * (1-speed) + next_value * speed

thanks! maybe i just didn't implement the algorithm correctly the first time