1 files changed, 72 insertions, 0 deletions
diff --git a/patches/mame2000/0003-add-sound-options.patch b/patches/mame2000/0003-add-sound-options.patch
new file mode 100644
index 0000000..266ce95
--- /dev/null
+++ b/patches/mame2000/0003-add-sound-options.patch
@@ -0,0 +1,72 @@
+diff --git a/src/libretro/libretro.c b/src/libretro/libretro.c
+index bf0ed70..d51b9f0 100644
+--- a/src/libretro/libretro.c
++++ b/src/libretro/libretro.c
+@@ -65,6 +65,9 @@ int update_audio_latency                 = false;
+ 
+ int should_skip_frame                    = 0;
+ 
++static int sample_rate                   = 32000;
++static int stereo_enabled                = true;
++
+ int game_index = -1;
+ unsigned short *gp2x_screen15;
+ int thread_done = 0;
+@@ -272,6 +275,27 @@ static void update_variables(bool first_run)
+     else
+         global_showinfo = 0;
+ 
++    var.value = NULL;
++    var.key = "mame2000-sample_rate";
++
++    sample_rate = 32000;
++
++    if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
++       sample_rate = strtol(var.value, NULL, 10);
++
++    var.value = NULL;
++    var.key = "mame2000-stereo";
++
++    if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
++    {
++        if(strcmp(var.value, "enabled") == 0)
++            stereo_enabled = true;
++        else
++            stereo_enabled = false;
++    }
++    else
++        stereo_enabled = true;
++
+    /* Reinitialise frameskipping, if required */
+    if (!first_run &&
+        ((frameskip_type     != prev_frameskip_type)))
+@@ -286,6 +310,8 @@ void retro_set_environment(retro_environment_t cb)
+       { "mame2000-frameskip_interval", "Frameskip Interval; 1|2|3|4|5|6|7|8|9" },
+       { "mame2000-skip_disclaimer", "Skip Disclaimer; enabled|disabled" },
+       { "mame2000-show_gameinfo", "Show Game Information; disabled|enabled" },
++      { "mame2000-sample_rate", "Audio Rate (Restart); 32000|11025|22050|32000|44100" },
++      { "mame2000-stereo", "Stereo (Restart); enabled|disabled" },
+       { NULL, NULL },
+    };
+    environ_cb = cb;
+@@ -643,7 +669,7 @@ void retro_get_system_av_info(struct retro_system_av_info *info)
+    };
+    struct retro_system_timing t = {
+       Machine->drv->frames_per_second,
+-      32000.0
++      (double)Machine->sample_rate
+    };
+    info->timing = t;
+    info->geometry = g;
+@@ -881,8 +907,9 @@ bool retro_load_game(const struct retro_game_info *info)
+    i=create_path_recursive(cheatdir);
+    if(i!=0)printf("error %d creating cheat \"%s\"\n", i,cheatdir);
+ 
+-   Machine->sample_rate = 32000;
+-   options.samplerate = 32000;
++   Machine->sample_rate = sample_rate;
++   options.samplerate = sample_rate;
++   usestereo = stereo_enabled;
+ 
+    /* This is needed so emulated YM3526/YM3812 chips are used instead on physical ones. */
+    options.use_emulated_ym3812 = 1;