Re: Problem playing different sound using same source id

Hi,

Which OpenAL device are you opening?   Which OS are you using, and which
soundcard?

I would recommend changing the way you are checking to see if a Source has
finished playing from ...

if (state == AL_STOPPED)
      ...

to

if (state != AL_PLAYING)
      ...

(and if you support Pause / Resume) then it should be

if ((state != AL_PLAYING) && (state != AL_PAUSED))
      ...

This is because some implementations set the state to AL_INITIAL when it is
not playing anymore.

I would also make sure that there were no errors set during any of these
calls, and critically when creating and attaching audio data to bufferB.

Dan
Creative Labs (UK) Ltd.

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             02/02/2009 11:38          different sound using same source  
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Hi,

I've just hit weird problem with OpenAL when trying to play sound using
source which was previously used for playing different sound.

I have installed latest OpenAL and got latest OpenAL SDK (1.1).

The exact repro scenario is as follows:
(1) initialize openal, allocate as many as possible source ids
(2) grab first source id and play the sound A, wait till it finishes
(3) use the same source id and play sound B <<== the sound doesn't play
even
though openal sais it being plays

I can repeat (3) as many times as I want and the sound will never actually
be heard. If I use another source id from allocated pool, then it plays.
Sound A can be played again as many times as I want using first source id
though.

However if I play any sound while sound B is still supposed to play (and
so,
I need to use another source id), the sound B gets _unlocked_ and it can
suddenly be heard from where it was supposed to be at that time. From now
on
I can play B as many times as I want.

I have double checked I don't change _any_ source attributes like pitch /
gain or other.
This is the complete OpenAL calls that lead to problem:

source0 is my source id
bufferA and bufferB are two OpenAL sound buffers

// Play sound A
alSourcei(source0, AL_BUFFER, bufferA);
alSourcePlay(source0);
while (true)
{
  ALint state;
  alGetSourcei(source0, AL_SOURCE_STATE, &state);
  if (state == AL_STOPPED)
    break;
}
alSourceStop(source0);
alSourcei(source0, AL_BUFFER, 0);

// Play sound B - won't play !!!!
alSourcei(source0, AL_BUFFER, bufferB);
alSourcePlay(source0);
while (true)
{
  ALint state;
  alGetSourcei(source0, AL_SOURCE_STATE, &state);
  if (state == AL_STOPPED)
    break;
}
alSourceStop(source0);
alSourcei(source0, AL_BUFFER, 0);

Thanks anyone for any help with that!

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