[Openal] xfi issues

[Xavier Bouchoux]

Xavier Bouchoux a écrit :
> hello,
> [...]
> 
> And I seem to have related issues with streamming sounds. I'll 
> investigate a bit further.

So the issue I have is that a source incorrectly (I think!) changes state:

- create a source
- queue some buffer
- play the source
- wait until the sources eats all its buffer
(at this point the source is AL_STOPPED)
- dequeue all the buffers

the sources changes to AL_INITIAL with the X-fi driver. (with the 
software it stays "AL_STOPPED".)

I'd says by reading the spec that that the correct behaviour would be to 
stay AL_STOPPED.

Additionally, If you don't empty the queue but replace the processed 
buffers by fresh ones, one by one, it stays "stopped".

That is, if when the source has processed all its buffers,
  you dequeue all and requeue all -> it will be in AL_INITIAL state,
whereas if
  you dequeue and requeue the buffers one by one, -> AL_STOPPED

At the end of the mail is a patch for PlayStream.cpp that shows the problem.


(To be honest both issues are minor for me:
the buffer changing name only bothered me because it triggered an assert 
in my code,
and this streamming issue only revealed a bug in my code, I was 
refilling the buffer queue twice after a starvation...)

xavier.



@@ -104,6 +104,23 @@

   iTotalBuffersProcessed = 0;

+ Sleep(3000);	// starve the source.
+
+ alGetSourcei(uiSource, AL_SOURCE_STATE, &iState);
+ ALFWprintf("State before = 0x%x\n", iState);
+
+ iBuffersProcessed = 0;
+ alGetSourcei(uiSource, AL_BUFFERS_PROCESSED, &iBuffersProcessed);
+ ALFWprintf("processed buffers = 0x%x\n", iBuffersProcessed);
+ while (iBuffersProcessed>0) {
+    alSourceUnqueueBuffers(uiSource, 1, &uiBuffer);
+    iBuffersProcessed--;
+ }
+ // at this point, all the buffers are unqueued
+
+ alGetSourcei(uiSource, AL_SOURCE_STATE, &iState);
+ ALFWprintf("State after = 0x%x\n", iState);
+
   while (!ALFWKeyPress())
   {
      Sleep( SERVICE_UPDATE_PERIOD );