Partial conversion of the wmapro decoder to fixed point arithmetic. Currently inverse quantization & rescaling,

imdct and windowing are all in fixed point.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27302 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 12 insertions, 2 deletions

diff --git a/apps/codecs/libwmapro/README.rockbox b/apps/codecs/libwmapro/README.rockbox
index 09c54b48c6..9bd737a432 100644
--- a/apps/codecs/libwmapro/README.rockbox
+++ b/apps/codecs/libwmapro/README.rockbox
@@ -14,8 +14,18 @@ IMPORT DETAILS
 
 Based on ffmpeg svn r22886 dated 15 April 2010.
 
-Currently, the files contain minimal changes from their original state in order
-to be able to compile cleanly. 
+The code is slowly being modified to convert it from floating point maths to 
+fixed point.
+
+As of 6 July 2010, the following steps are all working properly in fixed point:
+- Inverse quantization and rescaling
+- IMDCT
+- Windowing
+
+Results of comparing output wav files from the partially fixed point decoder to 
+the output wav files of ffmpeg decoder are :
+- average relative error = 0.016%
+- maximum relative error = 0.3% 
 
 COMPILING