From d47f16074ff4678d0ea968318354fc8ca6e0ba90 Mon Sep 17 00:00:00 2001
From: Peter Ross <pross@xvid.org>
Date: Sun, 22 Jun 2008 13:20:41 +0000
Subject: [PATCH] vp6: ensure that huffman decoding table is sorted with
 descending symbol order Previous code worked by pure luck with glibc qsort
 implementation. patch by Peter Ross   pross _at_ xvid _dot_ org

Originally committed as revision 13887 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/vp6.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/vp6.c b/libavcodec/vp6.c
index 74c62ff66d..c1cd6fe64b 100644
--- a/libavcodec/vp6.c
+++ b/libavcodec/vp6.c
@@ -202,10 +202,11 @@ static void vp6_parse_vector_models(vp56_context_t *s)
                 model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
 }
 
+/* nodes must ascend by count, but with descending symbol order */
 static int vp6_huff_cmp(const void *va, const void *vb)
 {
     const Node *a = va, *b = vb;
-    return a->count >= b->count;
+    return (a->count - b->count)*16 + (b->sym - a->sym);
 }
 
 static void vp6_build_huff_tree(vp56_context_t *s, uint8_t coeff_model[],