From: Mans Rullgard <mans@mansr.com>
Date: Mon, 16 May 2011 14:57:04 +0000 (+0100)
Subject: dct: bypass table allocation for DCT_II of size 32
X-Git-Tag: v0.7rc1~462
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=721d6f2dc5437df21ae17923b29fa2be847764c7;p=platform%2Fupstream%2Flibav.git

dct: bypass table allocation for DCT_II of size 32

The size-32 DCT_II has a special implementation which doesn't use
the normal tables.  Skipping allocation of these in this case saves
some memory.

Signed-off-by: Mans Rullgard <mans@mansr.com>
---

diff --git a/libavcodec/dct.c b/libavcodec/dct.c
index 83ea00f9c..e7a8f227b 100644
--- a/libavcodec/dct.c
+++ b/libavcodec/dct.c
@@ -180,9 +180,14 @@ av_cold int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType inverse)
     int n = 1 << nbits;
     int i;
 
+    memset(s, 0, sizeof(*s));
+
     s->nbits    = nbits;
     s->inverse  = inverse;
 
+    if (inverse == DCT_II && nbits == 5) {
+        s->dct_calc = dct32_func;
+    } else {
     ff_init_ff_cos_tabs(nbits+2);
 
     s->costab = ff_cos_tabs[nbits+2];
@@ -203,9 +208,7 @@ av_cold int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType inverse)
     case DCT_III: s->dct_calc = ff_dct_calc_III_c; break;
     case DST_I  : s->dct_calc = ff_dst_calc_I_c; break;
     }
-
-    if (inverse == DCT_II && nbits == 5)
-        s->dct_calc = dct32_func;
+    }
 
     s->dct32 = dct32;
     if (HAVE_MMX)     ff_dct_init_mmx(s);