Sound speed

LinkCraft

Can you change the speed of audio while it’s playing?

waldron

//global
speed = 1
loop
clear()
playAudio( channel, handle, volume, pan, speed, loops )

if c.a then
speed+= 1
endif

vinicity

If you are talking about playing asset sounds with playAudio(), I'm pretty sure that you cannot change the speed while the audio is already playing. I tried this in my entry for the Speed themed game jam, but couldn't find a way to do it...

Running waldron's code above restarts the audio for each loop, which you probably do not want.

One idea I had at the time was to have the same audio playing on different channels, but at slightly different speed, and then slowly cross fade from one to the other by changing the volume of both channels (volume can be changed while its playing with setVolume()).

I guess it depends on the audio, if it would be possible to make that sound OK...

waldron

This post is deleted!

vinicity

@waldron No, I just tested it. The audio definitely restarts every time you call playAudio().

waldron

This post is deleted!

vinicity

This post is deleted!

PickleCatStars

What happens if you setfrequency the channel the audio’s playing on?

vinicity

@toxibunny I just tested it, and it actually works!

Now I feel stupid.I just kept looking for a setSpeed() command, since the parameter to playAudio() is called speed!

vinicity

You can use setFrequency with a frequency parameter that goes from 0 (the sounds then stops playing) and upwards. Setting it to 1 means playing at normal speed. So the parameter isn't really a frequency, but seems to correspond to the speed parameter from playAudio()!

I tested this:

music = loadAudio("...")
playAudio(0, music, 1, .5, 1, -1)
freq = 1
loop
   clear()
   c = controls(0)
   freq += c.ly / 100
   print(freq)
   setFrequency(0, freq)
   update()
repeat

...and then you can control the speed of the music with the left stick while it is playing!

waldron

maybe i need my weetabix haha glad you found a solution

LinkCraft

Thanks I’ll try it out