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Explicitly set tx_type for sub8x8 blocks

Fixes an issue where the tx_type was not set correctly for
sub8x8 inter and intra blocks. In the current syntax, for
sub8x8 blocks, there is still a single tx_type that is
transmitted. Ideally, this should be searched for the best
rd performance, albeit at the expense of encode speed.
For now, we just set it to DCT_DCT. Previously it was left
incorrectly as what was used for the previous non sub8x8
block.

derflr: BDRATE -0.277%

Change-Id: If76ba903bfbfd4d374cf1ac7d1daee50e92f0edd

--- a/vp10/encoder/rdopt.c

+++ b/vp10/encoder/rdopt.c

@@ -1073,6 +1073,12 @@

   memcpy(t_above, xd->plane[0].above_context, sizeof(t_above));

   memcpy(t_left, xd->plane[0].left_context, sizeof(t_left));

+  // TODO(any): Add search of the tx_type to improve rd performance at the

+  // expense of speed.

+  mic->mbmi.tx_type = DCT_DCT;

+

+  // Later we can add search of the tx_type to improve results.

+  // For now just set it to DCT_DCT

   // Pick modes for each sub-block (of size 4x4, 4x8, or 8x4) in an 8x8 block.

   for (idy = 0; idy < 2; idy += num_4x4_blocks_high) {

     for (idx = 0; idx < 2; idx += num_4x4_blocks_wide) {

@@ -3939,6 +3945,10 @@

       rd_opt->threshes[segment_id][bsize][THR_GOLD] : this_rd_thresh;

       for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; ++i)

         filter_cache[i] = INT64_MAX;

+

+      // TODO(any): Add search of the tx_type to improve rd performance at the

+      // expense of speed.

+      mbmi->tx_type = DCT_DCT;

       if (cm->interp_filter != BILINEAR) {

         tmp_best_filter = EIGHTTAP;

-- 

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