From aafd659518356d1ae3624830a36816f154d94d83 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Reimar=20D=C3=B6ffinger?= <Reimar.Doeffinger@gmx.de>
Date: Thu, 15 Oct 2009 11:50:32 +0000
Subject: [PATCH] Do not initialize ff_cos_* tables again in rdft_init, they
 are already initialized by ff_fft_init and using different code can result in
 slightly different values, in addition it crashes when the tables are
 hardcoded. On amd64 this slightly changes qdm2 output.

Originally committed as revision 20237 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/dsputil.h | 2 +-
 libavcodec/rdft.c    | 1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/libavcodec/dsputil.h b/libavcodec/dsputil.h
index 3656d1c3b5..50889bb1d1 100644
--- a/libavcodec/dsputil.h
+++ b/libavcodec/dsputil.h
@@ -840,7 +840,7 @@ typedef struct {
     int sign_convention;
 
     /* pre/post rotation tables */
-    FFTSample *tcos;
+    const FFTSample *tcos;
     FFTSample *tsin;
     FFTContext fft;
 } RDFTContext;
diff --git a/libavcodec/rdft.c b/libavcodec/rdft.c
index 0fe26ab01a..ed4e39aa08 100644
--- a/libavcodec/rdft.c
+++ b/libavcodec/rdft.c
@@ -64,7 +64,6 @@ av_cold int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans)
     s->tcos = ff_cos_tabs[nbits-4];
     s->tsin = ff_sin_tabs[nbits-4]+(trans == RDFT || trans == IRIDFT)*(n>>2);
     for (i = 0; i < (n>>2); i++) {
-        s->tcos[i] = cos(i*theta);
         s->tsin[i] = sin(i*theta);
     }
     return 0;