Stopping sound that hasn't been played yet takes a long time

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Dr Tank

15

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Joined: 1st Apr 2009

Location: Southampton, UK

Posted: 2nd Jul 2011 01:11 Edited at: 2nd Jul 2011 01:12

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See code. I attach a sound file too.

Press ctrl to see effect of not calling "stop".

Press space or return to loop or play the sound, and after this any stop sound commands won't take much time to run. Curiously, you can press shift to play a different sound, and that will cure it too!

Notice also that the first play/loop call takes a long time too. Until this is fixed, i recommend people play+stop at least one sound once they've loaded them!

DBP 1.077, Windows 7.

+ Code Snippet

sync
sync rate 0
backdrop on

mysound=1
myothersound=2
load sound "BlowTorch.wav",mysound
load sound "BlowTorch.wav",myothersound

mytimerstart as dword
mytimerlast as dword


do
   thrust=spacekey()

   mytimerstart=timer()
   if thrust
      if sound looping(mysound)=0
        loop sound mysound
      endif
   else
      if controlkey()=0
          stop sound mysound
      endif
   endif

   if returnkey() then play sound mysound
   if shiftkey() then play sound myothersound

   avg_time_taken#=avg_time_taken#*0.9 + 0.1*(timer()-mytimerstart)
   text 0,0,str$(avg_time_taken#,2)
   box 50,10,50+50*avg_time_taken#,15

   sync
loop

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Green Gandalf

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Joined: 3rd Jan 2005

Playing: Malevolence:Sword of Ahkranox, Skyrim, Civ6.

Posted: 2nd Jul 2011 01:47

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I don't really understand what that code is supposed to show.

Could you give step by step instructions of what to do and what to expect - and what you think ought to happen?

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Dr Tank

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Joined: 1st Apr 2009

Location: Southampton, UK

Posted: 2nd Jul 2011 02:19 Edited at: 2nd Jul 2011 02:23

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Sorry. The code is overly complicated. This suffices:

+ Code Snippet

sync
sync rate 0
backdrop on

mysound=1
myothersound=2
load sound "BlowTorch.wav",mysound
load sound "BlowTorch.wav",myothersound

mytimerstart as dword


do
   thrust=spacekey()

   if returnkey() then play sound mysound
   if shiftkey() then play sound myothersound

   mytimerstart=timer()
       stop sound mysound
   time_taken= timer()-mytimerstart

   text 0,0,str$(time_taken)
   box 50,10,50+50*time_taken,15

   sync
loop

What it shows it that before a "play sound" is used, "stop sound" takes several milliseconds. After either sound is played, "stop sound" takes virtually no time.

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Green Gandalf

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Joined: 3rd Jan 2005

Playing: Malevolence:Sword of Ahkranox, Skyrim, Civ6.

Posted: 2nd Jul 2011 14:20 Edited at: 2nd Jul 2011 14:24

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That's no better for me - all I can really see is a flickering "0" at the top of the screen.

I think the following shows your point more clearly:

+ Code Snippet

set display mode desktop width(), desktop height(), 32
sync on
sync rate 0
backdrop on

mysound=1
myothersound=2
load sound "BlowTorch.wav",mysound
load sound "BlowTorch.wav",myothersound

mytimerstart as dword

dim results(60)
counter = 0
repeat

   ` if either of these lines is uncommented then the stop sound instruction is instantaneous
   ` however if BOTH are commented then stop sound sometimes takes several milliseconds
   ` the times for successive frames are listed at the end
   play sound mysound
   play sound myothersound

   mytimerstart=timer()
       stop sound mysound
   time_taken= timer()-mytimerstart

   results(counter) = time_taken
   inc counter

   sync
until counter >=50

repeat
  for i = 0 to 48
    text 20, i*20+20, str$(results(i))
  next i
  sync
until spacekey()

In all cases except one the timings are all zero. The exception is when no sounds have been played at all and nonzero timings are sometimes recorded.

I think that is your point and I agree something ain't right.

Edit

I'm using Vista 64 bit and U77RC7.

Also, your workaround makes sense. Of course a better solution is to only stop sounds that have been played.

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Dr Tank

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Joined: 1st Apr 2009

Location: Southampton, UK

Posted: 3rd Jul 2011 01:46

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Yes that's a solution.

There's still the almost completely unnoticeable problem of the first call to "play sound" will be longer than usual! I'm putting a sound as quiet as possible (volume 0) and playing it after i've loaded my sounds now.

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