[FFmpeg-cvslog] r12457 - trunk/libavcodec/mdct.c

[mru]

Author: mru
Date: Sun Mar 16 14:15:42 2008
New Revision: 12457

Log:
improve precision in mdct.c using double for some temporaries


Modified:
   trunk/libavcodec/mdct.c

Modified: trunk/libavcodec/mdct.c
==============================================================================
--- trunk/libavcodec/mdct.c	(original)
+++ trunk/libavcodec/mdct.c	Sun Mar 16 14:15:42 2008
@@ -54,7 +54,7 @@ void ff_kbd_window_init(float *window, f
 int ff_mdct_init(MDCTContext *s, int nbits, int inverse)
 {
     int n, n4, i;
-    float alpha;
+    double alpha;
 
     memset(s, 0, sizeof(*s));
     n = 1 << nbits;
@@ -85,10 +85,10 @@ int ff_mdct_init(MDCTContext *s, int nbi
 /* complex multiplication: p = a * b */
 #define CMUL(pre, pim, are, aim, bre, bim) \
 {\
-    float _are = (are);\
-    float _aim = (aim);\
-    float _bre = (bre);\
-    float _bim = (bim);\
+    double _are = (are);\
+    double _aim = (aim);\
+    double _bre = (bre);\
+    double _bim = (bim);\
     (pre) = _are * _bre - _aim * _bim;\
     (pim) = _are * _bim + _aim * _bre;\
 }