As mentioned in an earlier post, I found a Python interpreter for PSP that supports some functions from the excellent OSLib-Mod library - you can download it here. Now, let’s see what we can do with it.

Let’s start by importing the modules we will be using:

import sys
import osl
import pspmp3
import time

First, let’s get our program to play some background music. We can use the pspmp3 module for this:

pspmp3.init(1)
pspmp3.load("theme.mp3")
pspmp3.play(1)

The pspmp3 module is annoyingly fussy about the files it is fed. I had to try a few profiles before finding a working one (shown below):

Next, sound effects. the osl module has a Sound class that will do for our purposes:

voice = osl.Sound("voice.wav")
voice.play()

Wav files are not as troublesome - converting a random audio file with Audacity worked right off the bat.

Loading an image is also pretty straightforward:

mainImage = osl.Image("image1.png", osl.IN_RAM, osl.PF_8888)

The complication is that in order to be refreshed at every frame, the image has to be inside a cycle:

while not osl.mustQuit():
    osl.startDrawing()
    mainImage.draw()
    osl.syncFrame()
    osl.endDrawing()
    osl.endFrame()   

Let’s add some bare-bone interactivity - when X is pressed, a sound is played and the image changes:

while not osl.mustQuit():
    pad = osl.Controller()
    if pad.pressed_cross:
        mainImage = osl.Image("image2.png", osl.IN_RAM, osl.PF_8888)
        voice.play()
        Event = True

All of the above also needs to be in a cycle, so that the interpreter constantly checks if a button has been pressed.

Finally, let’s add some code to exit gracefully when triangle is pressed:

if pad.pressed_triangle:
	osl.safeQuit()

Put it all together, and this is what you end up with:

import sys
import osl
import pspmp3
import time

osl.initGfx()

mainImage = osl.Image("image1.png", osl.IN_RAM, osl.PF_8888)

pspmp3.init(1)
pspmp3.load("theme.mp3")
pspmp3.play(1)

voice = osl.Sound("voice.wav")

Event = False

while not osl.mustQuit():
    osl.startDrawing()
    mainImage.draw()
    osl.syncFrame()

    if Event:
        time.sleep(2)
        mainImage = osl.Image("image1.png", osl.IN_RAM, osl.PF_8888)
        Event = False

    pad = osl.Controller()
    if pad.pressed_cross:
        mainImage = osl.Image("image2.png", osl.IN_RAM, osl.PF_8888)
        voice.play()
        Event = True
        
    if pad.pressed_triangle:
        osl.safeQuit()

    osl.endDrawing()
    osl.endFrame()    

osl.endGfx()

Thrown in a bunch of assets of your choosing, and the result should look something like this: