vc1: Move INIT_LUT() further up to allow using it in more places

Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/vc1.c

@@ -570,6 +570,25 @@ int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContex
     return 0;
 }
 
+/* fill lookup tables for intensity compensation */
+#define INIT_LUT(lumscale, lumshift, luty, lutuv)   \
+    if (!lumscale) {                                \
+        scale = -64;                                \
+        shift = (255 - lumshift * 2) << 6;          \
+        if (lumshift > 31)                          \
+            shift += 128 << 6;                      \
+    } else {                                        \
+        scale = lumscale + 32;                      \
+        if (lumshift > 31)                          \
+            shift = (lumshift - 64) << 6;           \
+        else                                        \
+            shift = lumshift << 6;                  \
+    }                                               \
+    for (i = 0; i < 256; i++) {                     \
+        luty[i]  = av_clip_uint8((scale * i + shift + 32) >> 6);           \
+        lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);  \
+    }
+
 int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
 {
     int pqindex, lowquant, status;
@@ -800,25 +819,6 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
     return 0;
 }
 
-/* fill lookup tables for intensity compensation */
-#define INIT_LUT(lumscale, lumshift, luty, lutuv)   \
-    if (!lumscale) {                                \
-        scale = -64;                                \
-        shift = (255 - lumshift * 2) << 6;          \
-        if (lumshift > 31)                          \
-            shift += 128 << 6;                      \
-    } else {                                        \
-        scale = lumscale + 32;                      \
-        if (lumshift > 31)                          \
-            shift = (lumshift - 64) << 6;           \
-        else                                        \
-            shift = lumshift << 6;                  \
-    }                                               \
-    for (i = 0; i < 256; i++) {                     \
-        luty[i]  = av_clip_uint8((scale * i + shift + 32) >> 6);           \
-        lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);  \
-    }
-
 int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
 {
     int pqindex, lowquant;