Choose RV3/4 DC quantizer correctly

Originally committed as revision 15675 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/rv34.c

@@ -1046,7 +1046,7 @@ static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)
     if(cbp == -1)
         return -1;
 
-    luma_dc_quant = r->si.type ? r->luma_dc_quant_p[s->qscale] : r->luma_dc_quant_i[s->qscale];
+    luma_dc_quant = r->block_type == RV34_MB_P_MIX16x16 ? r->luma_dc_quant_p[s->qscale] : r->luma_dc_quant_i[s->qscale];
     if(r->is16){
         memset(block16, 0, sizeof(block16));
         rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0);
@@ -1060,7 +1060,7 @@ static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)
         blkoff = ((i & 1) << 2) + ((i & 4) << 3);
         if(cbp & 1)
             rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->luma_vlc, 0);
-        rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[luma_dc_quant],rv34_qscale_tab[s->qscale]);
+        rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[s->qscale],rv34_qscale_tab[s->qscale]);
         if(r->is16) //FIXME: optimize
             s->block[blknum][blkoff] = block16[(i & 3) | ((i & 0xC) << 1)];
         rv34_inv_transform(s->block[blknum] + blkoff);