bugfix: portaudio backend now handles blocked device correctly.

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1605 0778d3d1-df1d-0410-868b-ea421aaaa00d

ChangeLog

@@ -1,3 +1,8 @@
+2008-09-14	Csaba Hruska <csaba.hruska/at/gmail.com>
+	
+	* src/core/audio/audio_portaudio.cpp:
+	Bugfix: Fixed segfault when other app uses and blocks the audio device
+
 2008-09-08	Paul Giblock <drfaygo/at/gmail/dot/com>
 	
 	* src/core/timeline.cpp:

src/core/audio/audio_portaudio.cpp

@@ -113,6 +113,11 @@ audioPortAudio::audioPortAudio( bool & _success_ful, mixer * _mixer ) :
 		outDevIdx = Pa_GetDefaultOutputDevice();
 	}
 
+	if( inDevIdx < 0 || outDevIdx < 0)
+	{
+		return;
+	}
+	
 	double inLatency = (double)getMixer()->framesPerPeriod() / (double)sampleRate();
 	double outLatency = (double)getMixer()->framesPerPeriod() / (double)sampleRate();