Problem playing different sound using same source id

[MaciejS ()]

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!

[Daniel PEACOCK]

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.

Notice
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                                       [Openal-devel] Problem playing      
             02/02/2009 11:38          different sound using same source  
             PM                        id                                  
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           





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!

--
View this message in context:
http://www.nabble.com/Problem-playing-different-sound-using-same-source-id-tp21617947p21617947.html

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[MaciejS]

Hi Daniel,

Thanks for your suggestions.

I'm sorry for delayed reply.

(Un)fortunately described problem has suddenly disappeared after restarting PC and I couldn't reproduce it since then with exactly same code. Before restarting I spent few hours trying to create that simple case. And I did check all openal errors, there was none.

So, now it's probably not worth investigating anymore.

But anyway my details were:
OS: Windows XP
sound card: Realtek High Definition Audio (as part of Asus notebook)
driver: OpenAL ver. 1.1
  Renderer: Software
  Vendor: Creative Labs Inc.

Thanks,
Maciej

Daniel PEACOCK wrote:

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.

Notice
The information in this message is confidential and may be legally
privileged.  It is intended solely for the addressee.  Access to this
message by anyone else is unauthorized.  If you are not the intended
recipient,  any disclosure,  copying or distribution of the message,  or
any action taken by you in reliance on it,  is prohibited and may be
unlawful.  If you have received this message in error,  please delete it
and contact the sender immediately.  Thank you.

Creative Labs UK Ltd company number 2658256 registered in England and Wales
at Belmont Road, Belmont Place, Maidenhead, Berkshire, SL6 6TB



                                                                           
             MaciejS                                                      
             <msawitus@gmail.c                                            
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                                       [Openal-devel] Problem playing      
             02/02/2009 11:38          different sound using same source  
             PM                        id                                  
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           





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!

--
View this message in context:
http://www.nabble.com/Problem-playing-different-sound-using-same-source-id-tp21617947p21617947.html

Sent from the OpenAL - Dev mailing list archive at Nabble.com.

_______________________________________________
Openal-devel mailing list
[e-mail]
http://opensource.creative.com/mailman/listinfo/openal-devel

ForwardSourceID:NT00068F9E

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Openal-devel mailing list
[e-mail]
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