* desmume/src/frontend/posix/gtk/config_opts.h: Add the "audio_volume" option.

* desmume/src/frontend/posix/gtk/main.cpp: Add the "setaudiovolume" menu item.
* desmume/src/frontend/posix/gtk/main.cpp: Add the "setaudiovolume" action entry.
* desmume/src/frontend/posix/gtk/main.cpp(SetAudioVolume): Add this function.
* desmume/src/frontend/posix/gtk/main.cpp(CallbackSetAudioVolume): Add this function.
* desmume/src/frontend/posix/gtk/main.cpp(common_gtk_main): Add the "SNDSDLSetAudioVolume" function call.
* desmume/src/frontend/posix/shared/sndsdl.cpp: Add the "audio_volume" global variable.
* desmume/src/frontend/posix/shared/sndsdl.cpp(MixAudio): Add the "SDL_MixAudio" function call.
* desmume/src/frontend/posix/shared/sndsdl.cpp(SNDSDLGetAudioVolume): Add this function.
* desmume/src/frontend/posix/shared/sndsdl.cpp(SNDSDLSetAudioVolume): Add this function.
* desmume/src/frontend/posix/shared/sndsdl.h: Add the "audio_volume" global variable.
* desmume/src/frontend/posix/shared/sndsdl.h(SNDSDLGetAudioVolume): Add this function.
* desmume/src/frontend/posix/shared/sndsdl.h(SNDSDLSetAudioVolume): Add this function.

desmume/src/frontend/posix/gtk/config_opts.h

@@ -67,4 +67,5 @@ OPT(multisampling, bool, false, Config, OpenGLMultisampling)
 OPT(audio_enabled, bool, true, Audio, Enabled)
 OPT(audio_sync, int, 0, Audio, Synchronization)
 OPT(audio_interpolation, int, 1, Audio, Interpolation)
+OPT(audio_volume, int, 128, Audio, Volume)
 

desmume/src/frontend/posix/gtk/main.cpp

@@ -138,6 +138,7 @@ static void ResetSaveStateTimes();
 static void LoadSaveStateInfo();
 static void Printscreen();
 static void Reset();
+static void SetAudioVolume();
 static void Edit_Controls();
 static void Edit_Joystick_Controls();
 static void MenuSave(GtkMenuItem *item, gpointer slot);
@@ -358,6 +359,7 @@ static const char *ui_description =
 "        <menuitem action='save_t5'/>"
 "        <menuitem action='save_t6'/>"
 "      </menu>"
+"      <menuitem action='setaudiovolume'/>"
 "      <menuitem action='editctrls'/>"
 "      <menuitem action='editjoyctrls'/>"
 "    </menu>"
@@ -436,6 +438,7 @@ static const GtkActionEntry action_entries[] = {
         { "cheatsearch",     NULL,      "_Search",        NULL,       NULL,   CheatSearch },
         { "cheatlist",       NULL,      "_List",        NULL,       NULL,   CheatList },
       { "ConfigSaveMenu", NULL, "_Saves" },
+      { "setaudiovolume", NULL, "Set audio _volume", NULL, NULL, SetAudioVolume },
       { "editctrls",  NULL,        "_Edit controls",NULL,    NULL,   Edit_Controls },
       { "editjoyctrls",  NULL,     "Edit _Joystick controls",NULL,       NULL,   Edit_Joystick_Controls },
 
@@ -1904,6 +1907,38 @@ static gint Key_Release(GtkWidget *w, GdkEventKey *e, gpointer data)
 
 }
 
+/////////////////////////////// SET AUDIO VOLUME //////////////////////////////////////
+
+static void CallbackSetAudioVolume(GtkWidget* hscale, gpointer data)
+{
+	SNDSDLSetAudioVolume(gtk_range_get_value(GTK_RANGE(hscale)));
+	config.audio_volume = SNDSDLGetAudioVolume();
+}
+
+static void SetAudioVolume()
+{
+	GtkWidget *dialog = NULL;
+	GtkWidget *hscale = NULL;
+	int audio_volume = SNDSDLGetAudioVolume();
+	dialog = gtk_dialog_new_with_buttons("Set audio volume", GTK_WINDOW(pWindow), GTK_DIALOG_MODAL, GTK_STOCK_OK, GTK_RESPONSE_OK, GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL, NULL);
+	hscale = gtk_hscale_new_with_range(0, SDL_MIX_MAXVOLUME, 1);
+	gtk_range_set_value(GTK_RANGE(hscale), SNDSDLGetAudioVolume());
+        g_signal_connect(G_OBJECT(hscale), "value-changed", G_CALLBACK(CallbackSetAudioVolume), NULL);
+	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hscale, TRUE, FALSE, 0);
+	gtk_widget_show_all(GTK_DIALOG(dialog)->vbox);
+	switch(gtk_dialog_run(GTK_DIALOG(dialog)))
+	{
+		case GTK_RESPONSE_OK:
+			break;
+		case GTK_RESPONSE_CANCEL:
+		case GTK_RESPONSE_NONE:
+			SNDSDLSetAudioVolume(audio_volume);
+			config.audio_volume = SNDSDLGetAudioVolume();
+			break;
+	}
+	gtk_widget_destroy(dialog);
+}
+
 /////////////////////////////// CONTROLS EDIT //////////////////////////////////////
 
 static void AcceptNewInputKey(GtkWidget *w, GdkEventKey *e, struct modify_key_ctx *ctx)
@@ -3453,6 +3488,8 @@ common_gtk_main( class configured_features *my_config)
         g_timeout_add_seconds(my_config->timeout, timeout_exit_cb, GINT_TO_POINTER(my_config->timeout));
     }
 
+    SNDSDLSetAudioVolume(config.audio_volume);
+
     /* Video filter parameters */
     video->SetFilterParameteri(VF_PARAM_SCANLINE_A, _scanline_filter_a);
     video->SetFilterParameteri(VF_PARAM_SCANLINE_B, _scanline_filter_b);

desmume/src/frontend/posix/shared/sndsdl.cpp

@@ -57,6 +57,7 @@ static volatile u32 soundpos;
 static u32 soundlen;
 static u32 soundbufsize;
 static SDL_AudioSpec audiofmt;
+int audio_volume;
 
 //////////////////////////////////////////////////////////////////////////////
 #ifdef _XBOX
@@ -82,14 +83,17 @@ static void MixAudio(void *userdata, Uint8 *stream, int len) {
    int i;
    Uint8 *soundbuf=(Uint8 *)stereodata16;
 
+   Uint8 *stream_tmp=(Uint8 *)malloc(len);
    for (i = 0; i < len; i++)
    {
       if (soundpos >= soundbufsize)
          soundpos = 0;
 
-      stream[i] = soundbuf[soundpos];
+      stream_tmp[i] = soundbuf[soundpos];
       soundpos++;
    }
+   SDL_MixAudio(stream, stream_tmp, len, audio_volume);
+   free(stream_tmp);
 }
 
 //////////////////////////////////////////////////////////////////////////////
@@ -222,3 +226,11 @@ void SNDSDLSetVolume(int volume)
 }
 
 //////////////////////////////////////////////////////////////////////////////
+int SNDSDLGetAudioVolume()
+{
+   return audio_volume;
+}
+void SNDSDLSetAudioVolume(int value)
+{
+   audio_volume = value;
+}

desmume/src/frontend/posix/shared/sndsdl.h

@@ -23,4 +23,7 @@
 #define SNDCORE_SDL 2
 
 extern SoundInterface_struct SNDSDL;
+extern int audio_volume;
+int SNDSDLGetAudioVolume();
+void SNDSDLSetAudioVolume(int value);
 #endif