X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=ffmpeg%2Flibavcodec%2Fxface.h;h=0236d713ad75ecb5e87fc6563d8e80323622e16e;hb=092a91210f1b986dc846dc52988518f8f913eb72;hp=cd59ba084a2e49ea18729bcff5ba8be59fc13bdd;hpb=2ba45a602cbfa7b771effba9b11bb4245c21bc00;p=deb_ffmpeg.git

diff --git a/ffmpeg/libavcodec/xface.h b/ffmpeg/libavcodec/xface.h
index cd59ba0..0236d71 100644
--- a/ffmpeg/libavcodec/xface.h
+++ b/ffmpeg/libavcodec/xface.h
@@ -40,17 +40,18 @@
 
 /*
  * Image is encoded as a big integer, using characters from '~' to
- * '!', for a total of 92 symbols. In order to express 48x48=2304
- * bits, we need a total of 354 digits, as given by:
- * ceil(lg_92(2^2304)) = 354
+ * '!', for a total of 94 symbols. In order to express
+ * 48x48 pixels with the worst case encoding 666 symbols should
+ * be sufficient.
  */
-#define XFACE_MAX_DIGITS 354
+#define XFACE_MAX_DIGITS 666
 
 #define XFACE_BITSPERWORD 8
 #define XFACE_WORDCARRY (1 << XFACE_BITSPERWORD)
 #define XFACE_WORDMASK (XFACE_WORDCARRY - 1)
 
-#define XFACE_MAX_WORDS ((XFACE_PIXELS * 2 + XFACE_BITSPERWORD - 1) / XFACE_BITSPERWORD)
+// This must be larger or equal to log256(94^XFACE_MAX_DIGITS)
+#define XFACE_MAX_WORDS 546
 
 /* Portable, very large unsigned integer arithmetic is needed.
  * Implementation uses arrays of WORDs. */
@@ -84,8 +85,8 @@ enum XFaceColor { XFACE_COLOR_BLACK = 0, XFACE_COLOR_GREY, XFACE_COLOR_WHITE };
  * The probability of the data determines the range of possible encodings.
  * Offset gives the first possible encoding of the range. */
 typedef struct {
-    int range;
-    int offset;
+    uint8_t range;
+    uint8_t offset;
 } ProbRange;
 
 extern const ProbRange ff_xface_probranges_per_level[4][3];