[Openal] AL_BUFFERS_PROCESSED Issue on Linux

[Andrew Baker]

Quoting "P.J. Cast." <pjcast at yahoo.com>:

> >It would appear that underrun was the issue. The
> >playback is being started prior
> >to a level load which caused a brief underrun. I've
> >implemented underrun code
> >and it works fine.
> 
> Hello all,
> 
> I am having this same problem using Vorbis and my code
> is pretty much Identical to yours. I am really hoping
> you could show me the code you used to check for this
> buffer underrun/fix it because I am lost :(
> 
No problem. The revised ticker function is as follows:

---> CODE SNIPPET START ,--

//
// oggplayer_c::Ticker()
//
void oggplayer_c::Ticker()
{
	if (status == oggplayer_c::PLAYING)
	{
		int result;
		int processed;
		bool active = true;

		alGetSourcei(source, AL_BUFFERS_PROCESSED, &processed);
		while(processed--)
		{
			ALuint buffer;
	        
			alSourceUnqueueBuffers(source, 1, &buffer);
			result = alGetError();
			if(result != AL_NO_ERROR)
			{
				epi::error_c e
(ERR_MUSIC, "[oggplayer_c::Ticker] alSourceUnqueueBuffers() Failed");
				throw e;
			}

			active = StreamIntoBuffer(buffer);

			alSourceQueueBuffers(source, 1, &buffer);
			result = alGetError();
			if(result != AL_NO_ERROR)
			{
				epi::error_c e
(ERR_MUSIC, "[oggplayer_c::Ticker] alSourceQueueBuffers() Failed");
				throw e;
			}
			
		}

		// Check for underrun
		if (active)
		{
			int state; 
			
                        // We have data, so we should be playing...
			alGetSourcei(source, AL_SOURCE_STATE, &state);
			if (state != AL_PLAYING)
			{
				alGetSourcei(source, AL_BUFFERS_PROCESSED, 
&processed);
				alSourcePlay(source);
			}	
		}		
		else
		{
			// No more data. Seek to beginning and stop if not 
looping
			ov_raw_seek(&ogg_stream, 0);
			if (!looping)
				Stop();
		}
	}
}

---> CODE SNIPPET END <---

Cheers

--
Andrew Baker



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