[FFmpeg-devel] [PATCH] DIV0 in intrax8

[Roine Gustafsson]

Feeding garbage to wmv2 can cause a DIV0. This at least prevents the  
crash.

--- intrax8.c   (revision 11538)
+++ intrax8.c   (working copy)
@@ -698,12 +698,14 @@
      w->quant  = dquant >> 1;
      w->qsum   = quant_offset;

+    if (w->quant)
      w->divide_quant_dc_luma = ((1<<16) + (w->quant>>1)) / w->quant;
      if(w->quant < 5){
          w->quant_dc_chroma =  w->quant;
          w->divide_quant_dc_chroma = w->divide_quant_dc_luma;
      }else{
          w->quant_dc_chroma =  w->quant+((w->quant+3)>>3);
+        if (w->quant_dc_chroma)
          w->divide_quant_dc_chroma = ((1<<16) + (w- 
 >quant_dc_chroma>>1)) / w->quant_dc_chroma;
      }
      x8_reset_vlc_tables(w);

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