Work on atrac Joint Stereo mode. Correct calculation in getChannelWeights(), introduce lookup table and remove obsolete code. Optimize interpolation macro.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24665 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 0 insertions, 43 deletions

diff --git a/apps/codecs/libatrac/fixp_math.h b/apps/codecs/libatrac/fixp_math.h
index 5174cc7cc6..29d47a9e53 100644
--- a/apps/codecs/libatrac/fixp_math.h
+++ b/apps/codecs/libatrac/fixp_math.h
@@ -91,46 +91,3 @@
         return (int32_t)temp;
     }
 #endif
-
-static inline int32_t fixdiv16(int32_t x, int32_t y)
-{
-    int64_t temp;
-    temp = x << 16;
-    temp /= y;
-
-    return (int32_t)temp;
-}
-
-/*
- * Fast integer square root adapted from algorithm, 
- * Martin Guy @ UKC, June 1985.
- * Originally from a book on programming abaci by Mr C. Woo.
- * This is taken from :
- * http://wiki.forum.nokia.com/index.php/How_to_use_fixed_point_maths#How_to_get_square_root_for_integers
- * with a added shift up of the result by 8 bits to return result in 16.16 fixed-point representation.
- */
-static inline int32_t fastSqrt(int32_t n)
-{
-   /*
-    * Logically, these are unsigned. 
-    * We need the sign bit to test
-    * whether (op - res - one) underflowed.
-    */
-    int32_t op, res, one;
-    op = n;
-    res = 0;
-    /* "one" starts at the highest power of four <= than the argument. */
-    one = 1 << 30; /* second-to-top bit set */
-    while (one > op) one >>= 2;
-    while (one != 0) 
-    {
-        if (op >= res + one) 
-        {
-            op = op - (res + one);
-            res = res +  (one<<1);
-        }
-        res >>= 1;
-        one >>= 2;
-    }
-    return(res << 8);
-}