Fixes #332.

Changes.txt

@@ -23,6 +23,9 @@
   * Full rewrite of the audio subsystem; resample TIA output to target sample
     rate directly in Stella.
 
+  * Added option to force stereo sound for all ROMs, or to use the setting
+    on a per-ROM basis.
+
   * Threading: decouple emulation from frame rendering.
 
   * Main loop rewritten; emulating speed and timing is now much more faithful
@@ -69,17 +72,17 @@
 
   * Updated PAL palette.
 
-  * Updated included PNG library to latest stable version.
-
   * For UNIX systems: in the ROM launcher, when using symlinks use the
     symlink pathname instead of the underlying filesystem pathname.
 
-  * The Linux builds now use the system-installed PNG and ZLIB libraries
+  * The UNIX builds now use the system-installed PNG and ZLIB libraries
     by default.
 
   * For better compatibility, the Windows 32-bit version does not require SSE2
     anymore.
 
+  * Updated included PNG library to latest stable version.
+
 -Have fun!
 
 

src/common/AudioSettings.hxx

@@ -56,7 +56,7 @@ class AudioSettings
     static constexpr uInt32 DEFAULT_BUFFER_SIZE                     = 3;
     static constexpr uInt32 DEFAULT_HEADROOM                        = 2;
     static constexpr ResamplingQuality DEFAULT_RESAMPLING_QUALITY   = ResamplingQuality::lanczos_2;
-    static constexpr const char* DEFAULT_STEREO                     = "BYROM";
+    static constexpr const char* DEFAULT_STEREO                     = "byrom";
     static constexpr uInt32 DEFAULT_VOLUME                          = 80;
     static constexpr bool DEFAULT_ENABLED                           = true;
 

src/emucore/Console.cxx

@@ -753,10 +753,17 @@ void Console::setTIAProperties()
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void Console::createAudioQueue()
 {
+  const string& stereo = myOSystem.settings().getString(AudioSettings::SETTING_STEREO);
+  bool useStereo = false;
+  if(BSPF::equalsIgnoreCase(stereo, "byrom"))
+    useStereo = myProperties.get(Cartridge_Sound) == "STEREO";
+  else
+    useStereo = BSPF::equalsIgnoreCase(stereo, "stereo");
+
   myAudioQueue = make_shared<AudioQueue>(
     myEmulationTiming.audioFragmentSize(),
     myEmulationTiming.audioQueueCapacity(),
-    myProperties.get(Cartridge_Sound) == "STEREO"
+    useStereo
   );
 }