don't assume quant_matrix[0]==8 in ff_mpeg1_decode_block_intra(). this is...

don't assume quant_matrix[0]==8 in ff_mpeg1_decode_block_intra(). this is required for the Electronic Arts TQI decoder.

Originally committed as revision 17001 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpeg12.c

@@ -630,7 +630,7 @@ inline int ff_mpeg1_decode_block_intra(MpegEncContext *s,
     dc = s->last_dc[component];
     dc += diff;
     s->last_dc[component] = dc;
-    block[0] = dc<<3;
+    block[0] = dc*quant_matrix[0];
     dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
     i = 0;
     {