AVRational

sample_aspect_ratio
aspect ratio in JPEG JFIF is SAR not DAR !
removed nonsense SAR guessing code
various related cleanups
bugs?

Originally committed as revision 2403 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpeg12data.h

@@ -416,11 +416,22 @@ static const float mpeg1_aspect[16]={
     1.2015,
 };
 
-static const float mpeg2_aspect[16]={
-    0,
-    1.0,
-    -3.0/4.0,
-    -9.0/16.0,
-    -1.0/2.21,
+static const AVRational mpeg2_aspect[16]={
+    {0,1},
+    {1,1},
+    {4,3},
+    {16,9},
+    {221,100},
+    {0,1},
+    {0,1},
+    {0,1},
+    {0,1},
+    {0,1},
+    {0,1},
+    {0,1},
+    {0,1},
+    {0,1},
+    {0,1},
+    {0,1},
 };