10l: Move ff_mpeg4_pred_dc() to an appropriate place.

It is used by both encoders and decoders and should not be below
a CONFIG_ENCODERS preprocessor check.

Originally committed as revision 20980 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h263.c

@@ -707,6 +707,85 @@ void ff_h263_update_motion_val(MpegEncContext * s){
     }
 }
 
+/**
+ * predicts the dc.
+ * encoding quantized level -> quantized diff
+ * decoding quantized diff -> quantized level
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ * @param dir_ptr pointer to an integer where the prediction direction will be stored
+ */
+static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
+{
+    int a, b, c, wrap, pred, scale, ret;
+    int16_t *dc_val;
+
+    /* find prediction */
+    if (n < 4) {
+        scale = s->y_dc_scale;
+    } else {
+        scale = s->c_dc_scale;
+    }
+    if(IS_3IV1)
+        scale= 8;
+
+    wrap= s->block_wrap[n];
+    dc_val = s->dc_val[0] + s->block_index[n];
+
+    /* B C
+     * A X
+     */
+    a = dc_val[ - 1];
+    b = dc_val[ - 1 - wrap];
+    c = dc_val[ - wrap];
+
+    /* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
+    if(s->first_slice_line && n!=3){
+        if(n!=2) b=c= 1024;
+        if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024;
+    }
+    if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){
+        if(n==0 || n==4 || n==5)
+            b=1024;
+    }
+
+    if (abs(a - b) < abs(b - c)) {
+        pred = c;
+        *dir_ptr = 1; /* top */
+    } else {
+        pred = a;
+        *dir_ptr = 0; /* left */
+    }
+    /* we assume pred is positive */
+    pred = FASTDIV((pred + (scale >> 1)), scale);
+
+    if(encoding){
+        ret = level - pred;
+    }else{
+        level += pred;
+        ret= level;
+        if(s->error_recognition>=3){
+            if(level<0){
+                av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
+                return -1;
+            }
+            if(level*scale > 2048 + scale){
+                av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
+                return -1;
+            }
+        }
+    }
+    level *=scale;
+    if(level&(~2047)){
+        if(level<0)
+            level=0;
+        else if(!(s->workaround_bugs&FF_BUG_DC_CLIP))
+            level=2047;
+    }
+    dc_val[0]= level;
+
+    return ret;
+}
+
 #if CONFIG_ENCODERS
 
 static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
@@ -865,85 +944,6 @@ static inline void mpeg4_encode_blocks(MpegEncContext * s, DCTELEM block[6][64],
     }
 }
 
-/**
- * predicts the dc.
- * encoding quantized level -> quantized diff
- * decoding quantized diff -> quantized level
- * @param n block index (0-3 are luma, 4-5 are chroma)
- * @param dir_ptr pointer to an integer where the prediction direction will be stored
- */
-static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
-{
-    int a, b, c, wrap, pred, scale, ret;
-    int16_t *dc_val;
-
-    /* find prediction */
-    if (n < 4) {
-        scale = s->y_dc_scale;
-    } else {
-        scale = s->c_dc_scale;
-    }
-    if(IS_3IV1)
-        scale= 8;
-
-    wrap= s->block_wrap[n];
-    dc_val = s->dc_val[0] + s->block_index[n];
-
-    /* B C
-     * A X
-     */
-    a = dc_val[ - 1];
-    b = dc_val[ - 1 - wrap];
-    c = dc_val[ - wrap];
-
-    /* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
-    if(s->first_slice_line && n!=3){
-        if(n!=2) b=c= 1024;
-        if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024;
-    }
-    if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){
-        if(n==0 || n==4 || n==5)
-            b=1024;
-    }
-
-    if (abs(a - b) < abs(b - c)) {
-        pred = c;
-        *dir_ptr = 1; /* top */
-    } else {
-        pred = a;
-        *dir_ptr = 0; /* left */
-    }
-    /* we assume pred is positive */
-    pred = FASTDIV((pred + (scale >> 1)), scale);
-
-    if(encoding){
-        ret = level - pred;
-    }else{
-        level += pred;
-        ret= level;
-        if(s->error_recognition>=3){
-            if(level<0){
-                av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
-                return -1;
-            }
-            if(level*scale > 2048 + scale){
-                av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
-                return -1;
-            }
-        }
-    }
-    level *=scale;
-    if(level&(~2047)){
-        if(level<0)
-            level=0;
-        else if(!(s->workaround_bugs&FF_BUG_DC_CLIP))
-            level=2047;
-    }
-    dc_val[0]= level;
-
-    return ret;
-}
-
 static const int dquant_code[5]= {1,0,9,2,3};
 
 void mpeg4_encode_mb(MpegEncContext * s,