puzzles: enable fallback to audiobuf when smalloc() fails

- upon a failed smalloc(), the audio buffer will be used for further allocations
- should fix things on low-memory targets (c100 and c200v2), but breaks playback
- playback should still be intact on other targets

Change-Id: Ic239f1316efadc957050afacf5c614dbbca3f805

apps/plugins/puzzles/malloc.c

@@ -14,12 +14,40 @@
 int allocs = 0;
 int frees = 0;
 
+bool audiobuf_available =
+#ifndef COMBINED
+    true;
+#else
+    false;
+#endif
+
+static bool grab_audiobuf(void)
+{
+    if(!audiobuf_available)
+        return false;
+
+    if(rb->audio_status())
+        rb->audio_stop();
+
+    size_t sz, junk;
+    void *audiobuf = rb->plugin_get_audio_buffer(&sz);
+    extern char *giant_buffer;
+
+    add_new_area(audiobuf, sz, giant_buffer);
+    audiobuf_available = false;
+    return true;
+}
+
 void *smalloc(size_t size) {
     void *p;
     p = malloc(size);
     LOGF("allocs: %d", ++allocs);
     if (!p)
+    {
+        if(grab_audiobuf())
+            return smalloc(size);
         fatal("out of memory");
+    }
     return p;
 }
 
@@ -46,7 +74,11 @@ void *srealloc(void *p, size_t size) {
 	q = malloc(size);
     }
     if (!q)
+    {
+        if(grab_audiobuf())
+            return srealloc(p, size);
         fatal("out of memory");
+    }
     return q;
 }
 

apps/plugins/puzzles/rockbox.c

@@ -71,6 +71,7 @@ static void fix_size(void);
 
 static struct viewport clip_rect;
 static bool clipped = false;
+extern bool audiobuf_available;
 
 static struct settings_t {
     int slowmo_factor;
@@ -1026,7 +1027,10 @@ static int pausemenu_cb(int action, const struct menu_item_ex *this_item)
              * care, I bet */
             return ACTION_EXIT_MENUITEM;
 #else
+            if(audiobuf_available)
                 break;
+            else
+                return ACTION_EXIT_MENUITEM;
 #endif
         case 9:
             if(!midend_num_presets(me))
@@ -1355,10 +1359,10 @@ void deactivate_timer(frontend *fe)
 
 #ifdef COMBINED
 /* can't use audio buffer */
-static char giant_buffer[1024*1024*4];
+char giant_buffer[1024*1024*4];
 #else
-/* points to audiobuf */
-static char *giant_buffer = NULL;
+/* points to pluginbuf */
+char *giant_buffer = NULL;
 #endif
 static size_t giant_buffer_len = 0; /* set on start */
 
@@ -1565,6 +1569,18 @@ static int mainmenu_cb(int action, const struct menu_item_ex *this_item)
             return ACTION_EXIT_MENUITEM;
 #else
             break;
+#endif
+        case 4:
+#ifdef COMBINED
+            /* audio buf is used, so no playback */
+            /* TODO: neglects app builds, but not many people will
+             * care, I bet */
+            return ACTION_EXIT_MENUITEM;
+#else
+            if(audiobuf_available)
+                break;
+            else
+                return ACTION_EXIT_MENUITEM;
 #endif
         case 5:
             if(!midend_num_presets(me))