[FFmpeg-cvslog] r19350 - trunk/libavcodec/vp3.c

[reimar]

Author: reimar
Date: Sun Jul  5 20:25:58 2009
New Revision: 19350

Log:
Extend init_loop_filter to work for filter limit values up to 127 instead
of only up to 64. 127 is the maximum value allowed by the theora specification.

Modified:
   trunk/libavcodec/vp3.c

Modified: trunk/libavcodec/vp3.c
==============================================================================
--- trunk/libavcodec/vp3.c	Sun Jul  5 18:01:51 2009	(r19349)
+++ trunk/libavcodec/vp3.c	Sun Jul  5 20:25:58 2009	(r19350)
@@ -517,23 +517,30 @@ static void init_dequantizer(Vp3DecodeCo
 /*
  * This function initializes the loop filter boundary limits if the frame's
  * quality index is different from the previous frame's.
+ *
+ * The filter_limit_values may not be larger than 127.
  */
 static void init_loop_filter(Vp3DecodeContext *s)
 {
     int *bounding_values= s->bounding_values_array+127;
     int filter_limit;
     int x;
+    int value;
 
     filter_limit = s->filter_limit_values[s->qps[0]];
 
     /* set up the bounding values */
     memset(s->bounding_values_array, 0, 256 * sizeof(int));
     for (x = 0; x < filter_limit; x++) {
-        bounding_values[-x - filter_limit] = -filter_limit + x;
         bounding_values[-x] = -x;
         bounding_values[x] = x;
-        bounding_values[x + filter_limit] = filter_limit - x;
     }
+    for (x = value = filter_limit; x < 128 && value; x++, value--) {
+        bounding_values[ x] =  value;
+        bounding_values[-x] = -value;
+    }
+    if (value)
+        bounding_values[128] = value;
     bounding_values[129] = bounding_values[130] = filter_limit * 0x02020202;
 }