shithub: libvpx

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vp9_pick_inter_mode(): minor optimizations

1. remove duplicate initialization to mbmi->interp_filter.
2. move mv clamping into ref_frame loop instead of mode checking loop.
3. move the check if last frame is same as golden frame earlier to
avoid initialization of Golden reference related variables.

Change-Id: Idf2d05e19e94a24f69cc289687869fc71d2ff289

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -636,6 +636,7 @@

   struct macroblockd_plane *const pd = &xd->plane[0];

   PREDICTION_MODE best_mode = ZEROMV;

   MV_REFERENCE_FRAME ref_frame, best_ref_frame = LAST_FRAME;

+  MV_REFERENCE_FRAME usable_ref_frame;

   TX_SIZE best_tx_size = TX_SIZES;

   INTERP_FILTER best_pred_filter = EIGHTTAP;

   int_mv frame_mv[MB_MODE_COUNT][MAX_REF_FRAMES];

@@ -718,14 +719,17 @@

   mbmi->ref_frame[1] = NONE;

   mbmi->tx_size = MIN(max_txsize_lookup[bsize],

                       tx_mode_to_biggest_tx_size[cm->tx_mode]);

-  mbmi->interp_filter = cm->interp_filter == SWITCHABLE ?

-                        EIGHTTAP : cm->interp_filter;

 #if CONFIG_VP9_TEMPORAL_DENOISING

   vp9_denoiser_reset_frame_stats(ctx);

 #endif

-

-  for (ref_frame = LAST_FRAME; ref_frame <= GOLDEN_FRAME; ++ref_frame) {

+  if (cpi->rc.frames_since_golden == 0) {

+    ref_frame_skip_mask |= (1 << GOLDEN_FRAME);

+    usable_ref_frame = LAST_FRAME;

+  } else {

+    usable_ref_frame = GOLDEN_FRAME;

+  }

+  for (ref_frame = LAST_FRAME; ref_frame <= usable_ref_frame; ++ref_frame) {

     const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_buffer(cpi, ref_frame);

     x->pred_mv_sad[ref_frame] = INT_MAX;

@@ -751,6 +755,8 @@

       vp9_find_best_ref_mvs(xd, cm->allow_high_precision_mv, candidates,

                             &frame_mv[NEARESTMV][ref_frame],

                             &frame_mv[NEARMV][ref_frame]);

+      clamp_mv2(&frame_mv[NEARESTMV][ref_frame].as_mv, xd);

+      clamp_mv2(&frame_mv[NEARMV][ref_frame].as_mv, xd);

       if (!vp9_is_scaled(sf) && bsize >= BLOCK_8X8)

         vp9_mv_pred(cpi, x, yv12_mb[ref_frame][0].buf, yv12->y_stride,

@@ -760,9 +766,6 @@

     }

   }

-  if (cpi->rc.frames_since_golden == 0)

-    ref_frame_skip_mask |= (1 << GOLDEN_FRAME);

-

   for (idx = 0; idx < RT_INTER_MODES; ++idx) {

     int rate_mv = 0;

     int mode_rd_thresh;

@@ -769,19 +772,19 @@

     int mode_index;

     int i;

     PREDICTION_MODE this_mode = ref_mode_set[idx].pred_mode;

+    if (!(cpi->sf.inter_mode_mask[bsize] & (1 << this_mode)))

+      continue;

     ref_frame = ref_mode_set[idx].ref_frame;

-    mode_index = mode_idx[ref_frame][INTER_OFFSET(this_mode)];

-

-    i = (ref_frame == LAST_FRAME) ? GOLDEN_FRAME : LAST_FRAME;

-

     if (!(cpi->ref_frame_flags & flag_list[ref_frame]))

       continue;

+    if (const_motion[ref_frame] && this_mode == NEARMV)

+      continue;

+    i = (ref_frame == LAST_FRAME) ? GOLDEN_FRAME : LAST_FRAME;

     if (cpi->ref_frame_flags & flag_list[i])

       if (x->pred_mv_sad[ref_frame] > (x->pred_mv_sad[i] << 1))

         ref_frame_skip_mask |= (1 << ref_frame);

-

     if (ref_frame_skip_mask & (1 << ref_frame))

       continue;

@@ -789,18 +792,10 @@

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

       xd->plane[i].pre[0] = yv12_mb[ref_frame][i];

-    clamp_mv2(&frame_mv[NEARESTMV][ref_frame].as_mv, xd);

-    clamp_mv2(&frame_mv[NEARMV][ref_frame].as_mv, xd);

-

     mbmi->ref_frame[0] = ref_frame;

     set_ref_ptrs(cm, xd, ref_frame, NONE);

-    if (const_motion[ref_frame] && this_mode == NEARMV)

-      continue;

-

-    if (!(cpi->sf.inter_mode_mask[bsize] & (1 << this_mode)))

-      continue;

-

+    mode_index = mode_idx[ref_frame][INTER_OFFSET(this_mode)];

     mode_rd_thresh = best_mode_skip_txfm ?

             rd_threshes[mode_index] << 1 : rd_threshes[mode_index];

     if (rd_less_than_thresh(best_rdc.rdcost, mode_rd_thresh,

-- 

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