[FFmpeg-cvslog] avcodec/ppc/fdctdsp: use more accurate constants
Ganesh Ajjanagadde
git at videolan.org
Wed Dec 2 01:06:35 CET 2015
ffmpeg | branch: master | Ganesh Ajjanagadde <gajjanagadde at gmail.com> | Fri Nov 13 11:18:37 2015 -0500| [789ef087c636129af3db75eac71bee0b01a5f2fc] | committer: Ganesh Ajjanagadde
avcodec/ppc/fdctdsp: use more accurate constants
Whoever wrote this stuff had a pretty bad libm - digits differ pretty
quickly.
Reviewed-by: Ronald S. Bultje <rsbultje at gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=789ef087c636129af3db75eac71bee0b01a5f2fc
---
libavcodec/ppc/fdctdsp.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/libavcodec/ppc/fdctdsp.c b/libavcodec/ppc/fdctdsp.c
index 924d12c..6659046 100644
--- a/libavcodec/ppc/fdctdsp.c
+++ b/libavcodec/ppc/fdctdsp.c
@@ -37,13 +37,13 @@
#define vu16(v) ((vector unsigned short) (v))
#define vu32(v) ((vector unsigned int) (v))
-#define C1 0.98078525066375732421875000 /* cos(1 * PI / 16) */
-#define C2 0.92387950420379638671875000 /* cos(2 * PI / 16) */
-#define C3 0.83146959543228149414062500 /* cos(3 * PI / 16) */
-#define C4 0.70710676908493041992187500 /* cos(4 * PI / 16) */
-#define C5 0.55557024478912353515625000 /* cos(5 * PI / 16) */
-#define C6 0.38268342614173889160156250 /* cos(6 * PI / 16) */
-#define C7 0.19509032368659973144531250 /* cos(7 * PI / 16) */
+#define C1 0.98078528040323044912618224 /* cos(1 * PI / 16) */
+#define C2 0.92387953251128675612818319 /* cos(2 * PI / 16) */
+#define C3 0.83146961230254523707878838 /* cos(3 * PI / 16) */
+#define C4 0.70710678118654752440084436 /* cos(4 * PI / 16) */
+#define C5 0.55557023301960222474283081 /* cos(5 * PI / 16) */
+#define C6 0.38268343236508977172845998 /* cos(6 * PI / 16) */
+#define C7 0.19509032201612826784828487 /* cos(7 * PI / 16) */
#define W0 -(2 * C2)
#define W1 (2 * C6)
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