Fixed sound corruption upon starting the app; we need to continuously

write 'silence' to the sound card until there is available data to use.


git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@3152 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba

Changes.txt

@@ -20,6 +20,10 @@
     updated continuously.  This may also fix issues some people were
     having with triple-buffering in Windows Direct3D, etc.
 
+  * Fixed sound corruption that happened when running a ROM for the
+    first time.  This was most obvious under OSX, but occasionally
+    happened on other systems too.
+
   * Reverted some minor C++11 features (std::regex and cbegin/cend
     iterators) in a few places, since otherwise GCC 4.9 is required to
     compile Stella, and it isn't available on many systems yet.  These

src/common/SoundSDL2.cxx

@@ -365,6 +365,8 @@ void SoundSDL2::callback(void* udata, uInt8* stream, int len)
     // So, we need to convert the pointer and half the length
     sound->processFragment((Int16*)stream, (uInt32)len >> 1);
   }
+  else
+    SDL_memset(stream, 0, len);  // Write 'silence'
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

src/macosx/stella.xcodeproj/project.pbxproj

@@ -2040,7 +2040,7 @@
 		29B97313FDCFA39411CA2CEA /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0610;
+				LastUpgradeCheck = 0620;
 				ORGANIZATIONNAME = net.sourceforge.stella;
 			};
 			buildConfigurationList = 2D91752109BA903B0026E9FF /* Build configuration list for PBXProject "stella" */;