pdbox: Applied several changes by Buschel. Reintroduced compilation for iPods.

Changes by Buschel:

* Reduced footprint by making cosine table of size 1^13 instead of 1^15
* Corrected interpolation in the cos~ object
* Optimized multiplication on ARM platforms



git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26534 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 11 insertions, 1 deletions

diff --git a/apps/plugins/pdbox/PDa/intern/cos~.c b/apps/plugins/pdbox/PDa/intern/cos~.c
index 9e2d61f848..f787496c16 100644
--- a/apps/plugins/pdbox/PDa/intern/cos~.c
+++ b/apps/plugins/pdbox/PDa/intern/cos~.c
@@ -36,10 +36,20 @@ static t_int *cos_perform(t_int *w)
          phase = *in++;
          phase &= ((1<<fix1)-1);
          off =  fixtoi((long long)phase<<ILOGCOSTABSIZE);
-
+#ifdef ROCKBOX
+#ifdef NO_INTERPOLATION
+        *out = *(tab+off);
+#else /* NO_INTERPOLATION */
+        frac = phase & ((1<<(fix1-ILOGCOSTABSIZE))-1);
+        frac <<= ILOGCOSTABSIZE;
+        *out = mult(*(tab + off    ), (itofix(1) - frac)) + 
+               mult(*(tab + off + 1), frac);
+#endif /* NO_INTERPOLATION */
+#else /* ROCKBOX */
          frac = phase&(itofix(1)-1);
          *out = mult(*(tab + off),itofix(1) - frac) + 
               mult(*(tab + off + 1),frac);
+#endif /* ROCKBOX */
          out++;
     }
     return (w+4);