Merge pull request #107 from wermipls/master

Fix AY stereo separation settings. The default ("none") will now output mono sound by default, and the other values ("abc", "acb") will change the way channels are mixed, as they should.

fuse/sound.c

@@ -313,7 +313,8 @@ sound_init( const char *device )
 
   sound_enabled = sound_enabled_ever = 1;
 
-  sound_channels = ( sound_stereo_ay != SOUND_STEREO_AY_NONE ? 2 : 1 );
+  /* retroarch expects 2 channels regardless of whether the audio is mono or not */
+  sound_channels = 2;
 
   /* Adjust relative processor speed to deal with adjusting sound generation
      frequency against emulation speed (more flexible than adjusting generated
@@ -710,7 +711,13 @@ sound_frame( void )
     blip_buffer_read_samples( right_buf, samples + 1, count, 1 );
     count <<= 1;
   } else {
-    count = blip_buffer_read_samples( left_buf, samples, sound_framesiz, BLIP_BUFFER_DEF_STEREO );
+    long i;
+    count = blip_buffer_read_samples( left_buf, samples, sound_framesiz, 1 );
+    for (i = 0; i < count; ++i)
+    {
+      samples[i*2+1] = samples[i*2];
+    }
+    count <<= 1;
   }
 
   if( settings_current.sound ) 

src/compat/sound.c

@@ -7,7 +7,6 @@ int sound_lowlevel_init(const char *device, int *freqptr, int *stereoptr)
 {
    (void)device;
    *freqptr = 44100;
-   *stereoptr = 1;
    return 0;
 }