1.3 branch version of revision 2878.

Fixes Bugzilla #298.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402201

src/audio/SDL_audio.c

@@ -688,7 +688,9 @@ open_audio_device(const char *devname, int iscapture,
             return 0;
         }
         if (device->convert.needed) {
-            device->convert.len = desired.size;
+            device->convert.len = (int) ( ((double) desired.size) /
+                                          device->convert.len_ratio );
+
             device->convert.buf =
                 (Uint8 *) SDL_AllocAudioMem(device->convert.len *
                                             device->convert.len_mult);