Buflib: Make shrinking and buflib_available() smarter.

* shrinking now considers freespace just before the alloc-to-be-shrinked,
  that means less (or sometimes none at all) is taken from the audio buffer.
* core_available() now searches for the best free space, instead of simply the end,
  i.e. it will not return 0 if the audio buffer is allocated and there's free space
  before it. It also runs a compaction to ensure maximum contiguous memory.

audio_buffer_available() is also enhanced. It now considers the 256K reserve buffer,
and returns free buflib space instead if the audio buffer is short.

This all fixes the root problem of FS#12344 (Sansa Clip+: PANIC occurred when
dircache is enabled), that alloced from the audio buffer, even if it was very
short and buflib had many more available as free space before it.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31006 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 2 insertions, 2 deletions

diff --git a/apps/menus/main_menu.c b/apps/menus/main_menu.c
index 8053bf0cf8..bb8ea276fb 100644
--- a/apps/menus/main_menu.c
+++ b/apps/menus/main_menu.c
@@ -179,7 +179,7 @@ static const char* info_getname(int selected_item, void *data,
 
         case INFO_BUFFER: /* buffer */
         {
-            long kib = audio_buffer_available() / 1024; /* to KiB */
+            long kib = audio_buffer_size() / 1024; /* to KiB */
             output_dyn_value(s1, sizeof(s1), kib, kbyte_units, true);
             snprintf(buffer, buffer_len, "%s %s", str(LANG_BUFFER_STAT), s1);
         }
@@ -261,7 +261,7 @@ static int info_speak_item(int selected_item, void * data)
         case INFO_BUFFER: /* buffer */
         {
             talk_id(LANG_BUFFER_STAT, false);
-            long kib = audio_buffer_available() / 1024; /* to KiB */
+            long kib = audio_buffer_size() / 1024; /* to KiB */
             output_dyn_value(NULL, 0, kib, kbyte_units, true);
             break;
         }