Inserting current time from audio

[1u4]

Hi, I'm have a stab at löve-making and was wondering how to display the current time (elapsed) from an audio file via a key press call. Here is my attempt (I'm not even sure if tried to call the right function here) -- The error is about using a nil value so I guess I'm not calling the value correctly.

Code: Select all

function love.keypressed(key)
	if key == "f1" then
		x, y, z = love.audio.getPosition()
text = text .. string.x
text = text .. string.y
text = text .. string.z
		love.audio.pause(audioSource)
		status = "PAUSED"
	end
	if key == "f2" then
		love.audio.resume(audioSource)
		-- NOTE TO FUTURE SELF:
		-- Put resume / pause in array. Call array index, then index
		-- switch so if key is pressed again, result is different. 
		status = "RESUMED"
	end
	if key == "escape" then -- quit is always the last check
		love.event.push("quit") 
	end
end

function love.load()
	audioSource = love.audio.newSource("audioFile.mp3")
	love.audio.play(audioSource) 
	text = ">: "
	status = "AUTO-STARTED"
end

function love.draw()
    love.graphics.printf(text, 0, 0, 800)
    love.graphics.printf(status, 100, 100, 800)
end

About the api -- Löve is quite cool, but I wish it has some short example underneath each of the functions so it's clear how to use and call each correctly.

Thanks.

[bartbes]

You're looking for Source:tell. As to why your code errors:

Code: Select all

--snip
		x, y, z = love.audio.getPosition()
text = text .. string.x
text = text .. string.y
text = text .. string.z
--snip

You assign the result of getPosition to (global) x, y and z, but then try to use it as string.x, string.y and string.z, that won't work. You could directly append x, y and z, or if you really want to make sure it's converted to a string, use tostring(x) (same for y and z, of course). In any case, getPosition isn't the right function.

[1u4]

Thanks. I'm pretty new to lua and brand new to löve, but it's really hard to abstain until my lua skills have come of age.
Here's what I did with your help. It works nice

Code: Select all

function love.keypressed(key)
	if key == "f1" then
		love.audio.pause(audioSource)
		position = audioSource:tell( "seconds" )
		status = "PAUSED"
	end
	if key == "f2" then
		love.audio.resume(audioSource)
		-- NOTE TO FUTURE SELF:
		-- Put resume / pause in array. Call array index, then index
		-- switch so if key is pressed again, result is different. 
		status = "RESUMED"
	end
	if key == "escape" then -- quit is always the last check
		love.event.push("quit") 
	end
end

function love.load()
	audioSource = love.audio.newSource("audioFile.mp3")
	love.audio.play(audioSource) 
	text = "Last paused at: "
	status = "AUTO-STARTED"
end

function love.draw()
    love.graphics.printf(text .. tostring(position), 10, 0, 800)
    love.graphics.printf(status, 10, 25, 800)
end

[1u4]

I'm trying to swap a table index like so...

Code: Select all

playPause[1], playPause[2] = playPause[2], playPause[1] -- correct?

...but the behaviour is not correct in my app...

Code: Select all

	
if key == "f2" then
	playPause = {love.audio.pause(audioSource), love.audio.resume(audioSource)}
	controlPress = playPause[1] -- execute the index function
	playPause[1], playPause[2] = playPause[2], playPause[1] -- swap table index
	status = "PLAY/PAUSE"
end

Is it my löve code or my index switch code?

Thanks.

[Nixola]

Code: Select all

playPause = {love.audio.pause(audioSource), love.audio.resume(audioSource)}

With this you first pause the source, store the returned value (none) in playPause[1], then resume the source and store the returned value (none) in playPause[2], so it's the LÖVE code

[1u4]

Ah, I see -- Thanks. I also realised I shouldn't have my playPause table there either. I changed it to...

Code: Select all

	
if key == "f2" then
	if playPause[1] == "pause" then
		love.audio.pause(audioSource)
	else
		love.audio.resume(audioSource)	
	end	
	playPause[1], playPause[2] = playPause[2], playPause[1] -- swap table index
	status = "PLAY/PAUSE"
end

...moving playPause = {"pause", "play"} to the load() area.

[Nixola]

You could use booleans, it would be like this:

Code: Select all

--in love.load()
playing = true
--in Keypressed
if key == 'f2' then
    if playing then -- playing is true, so this is a valid condition and the chunk below will be executed
        love.audio.pause(Source)
    elseif not playing then --the elseif is useless, for if play is not true it is surely false
        love.audio.resume(Source)
    end
    playing = not playing --if playing is true it becomes false, if it's false it becomes true: 'not' changes a variable between true and false
end