On shutdown, deallocate global memory we might have allocated for eff…

…ects.

  Partially fixes Bugzilla #385.

effect_position.c

@@ -79,6 +79,20 @@ static position_args **pos_args_array = NULL;
 static position_args *pos_args_global = NULL;
 static int position_channels = 0;
 
+void _Eff_PositionDeinit(void)
+{
+    int i;
+    for (i = 0; i < position_channels; i++) {
+        free(pos_args_array[i]);
+    }
+
+    free(pos_args_global);
+    pos_args_global = NULL;
+    free(pos_args_array);
+    pos_args_array = NULL;
+}
+
+
 /* This just frees up the callback-specific data. */
 static void _Eff_PositionDone(int channel, void *udata)
 {

effects_internal.c

@@ -32,6 +32,9 @@
 #include <stdlib.h>
 #include "SDL_mixer.h"
 
+#define __MIX_INTERNAL_EFFECT__
+#include "effects_internal.h"
+
 /* Should we favor speed over memory usage and/or quality of output? */
 int _Mix_effects_max_speed = 0;
 
@@ -41,6 +44,11 @@ void _Mix_InitEffects(void)
     _Mix_effects_max_speed = (getenv(MIX_EFFECTSMAXSPEED) != NULL);
 }
 
+void _Mix_DeinitEffects(void)
+{
+    _Eff_PositionDeinit();
+}
+
 
 void *_Eff_volume_table = NULL;
 

effects_internal.h

@@ -41,6 +41,8 @@ extern void *_Eff_volume_table;
 void *_Eff_build_volume_table_u8(void);
 void *_Eff_build_volume_table_s8(void);
 
+void _Eff_PositionDeinit(void);
+
 /* Set up for C function definitions, even when using C++ */
 #ifdef __cplusplus
 }

mixer.c

@@ -35,6 +35,9 @@
 #include "load_voc.h"
 #include "load_ogg.h"
 
+#define __MIX_INTERNAL_EFFECT__
+#include "effects_internal.h"
+
 /* Magic numbers for various audio file formats */
 #define RIFF		0x46464952		/* "RIFF" */
 #define WAVE		0x45564157		/* "WAVE" */
@@ -266,8 +269,6 @@ static void PrintFormat(char *title, SDL_AudioSpec *fmt)
 }
 
 
-void _Mix_InitEffects(void);
-
 /* Open the mixer with a certain desired audio format */
 int Mix_OpenAudio(int frequency, Uint16 format, int nchannels, int chunksize)
 {
@@ -960,6 +961,7 @@ void Mix_CloseAudio(void)
 			Mix_UnregisterAllEffects(MIX_CHANNEL_POST);
 			close_music();
 			Mix_HaltChannel(-1);
+			_Eff_PositionDeinit();
 			SDL_CloseAudio();
 			free(mix_channel);
 			mix_channel = NULL;