Re: Re: Openal Digest, Vol 38, Issue 6

Hi,

What does sound.PlayALSound() do exactly?   In OpenAL, calling alSourcePlay
on a Source that is already playing causes it start to start playing from
the beginning.   You will never be able to make a seemless loop by making
repeated calls to alSourcePlay at the time you think the sample finishes
playing, you will inevitably re-start the file too early or too late, both
of which could cause an audible glitch.   Instead, you can enable looping
on the Source itself, using alSourcei(sourceID, AL_LOOPING, AL_TRUE) and
only call alSourcePlay once.

Dan
Creative Labs (UK) Ltd.

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             Robert Smyth                                                  
             <macgabhr@...>                                            
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             ensource.creative                                          cc
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                                                                   Subject
                                       [Openal] Re: Openal Digest, Vol 38,
             05/10/2009 03:37          Issue 6                            
             PM                                                            
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




I am using Microsoft visual basic. The Doppler effect is enabled however is
set to default (1) and I am currently not varying the pitch. The hardware
is all up to spec. I am using the standard openal implementation in order
to produce a sound, set listener position, velocity,alutLoadWAVFile,play
the sound stop the sound destroy the sound etc. The programme in full works
fine but like i explained above a clicking after each loop can be clearly
heard. Below is the function I am using to simulate the pass by of a car.
The wav file being loaded at the minute is a one second recording of an
engine. Delay_ms is set up so i can loop at the appropriate speed, I think
my error may be coming from incorrect splicing of the my wav file

void ALSound::PassBy()
{
-10;
sound.SetProperties(x,y,z,0,0,0);
delay_ms(1000);
loop done - hit Return to select again or X to exit\n");
}

2009/5/9 <openal-request@...>
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  Today's Topics:
  (Jason Daly)


  ----------------------------------------------------------------------

  Message: 1
  Date: Fri, 08 May 2009 17:32:24 -0400
  From: Jason Daly <jdaly@...>
  Subject: Re: [Openal] Popping or clicking at the end of sound loop
  To: Robert Smyth <macgabhr@...>
  Cc: "openal@..." <openal@...>
  Message-ID: <4A04A4E8.6040107@...>
  Content-Type: text/plain; charset=ISO-8859-1; format=flowed

  Robert Smyth wrote:
  > My program is set up so as the listener will experience a car noise
  > source pass by from his right to left i.e so as to simulate traffic.
  > In order for the sound to be updated to the speaker system
  > (headphones) the coordinates of the source are updated every meter in
  > the x direction. The wav files I have are edited so that when they
  > loop its as if theres no gap between them like a continuous sound but
  > as the coordinates up date the sound appears to get closer and then
  > further away as it passes by. My problem is that when i Load the
  > sound, after each snippet is played at each position a clicking or
  > popping is being heard by the listener before ech repition of the
  > source through the headphones which destroys the purpose of the code.
  > If anyone has any ideas of how to solve this problem I would
  > appreciate it.

  What OS are you using?

  What OpenAL implementation?

  What hardware?

  Do you have the Doppler effect enabled or disabled, or are you changing
  the pitch of the sound at all?.

  --"J"



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  End of Openal Digest, Vol 38, Issue 6
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