shithub: libvpx

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Add prediction mode skipping in non-rd situation

In non-rd pick_mode code, added mode skipping according to
thresholds. Used rd thresholds now, but we can modified them
later for real-time case.

RTC set borg test showed a 0.095% PSNR gain. For different rtc
clips, the real-time(speed 7) encoder speedup is 2% - 10%.

Change-Id: Ic72535c96b891092c662453be32d3168f7e34dcc

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

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

@@ -227,6 +227,12 @@

                                            intra_cost_penalty, 0);

   const int64_t intra_mode_cost = 50;

+  unsigned char segment_id = mbmi->segment_id;

+  const int *const rd_threshes = cpi->rd_threshes[segment_id][bsize];

+  const int *const rd_thresh_freq_fact = cpi->rd_thresh_freq_fact[bsize];

+  // Mode index conversion form THR_MODES to MB_PREDICTION_MODE for a ref frame.

+  int mode_idx[MB_MODE_COUNT] = {0};

+

   x->skip_encode = cpi->sf.skip_encode_frame && x->q_index < QIDX_SKIP_THRESH;

   x->skip = 0;

@@ -270,11 +276,24 @@

     mbmi->ref_frame[0] = ref_frame;

+    // Set conversion index for LAST_FRAME.

+    if (ref_frame == LAST_FRAME) {

+      mode_idx[NEARESTMV] = THR_NEARESTMV;   // LAST_FRAME, NEARESTMV

+      mode_idx[NEARMV] = THR_NEARMV;         // LAST_FRAME, NEARMV

+      mode_idx[ZEROMV] = THR_ZEROMV;         // LAST_FRAME, ZEROMV

+      mode_idx[NEWMV] = THR_NEWMV;           // LAST_FRAME, NEWMV

+    }

+

     for (this_mode = NEARESTMV; this_mode <= NEWMV; ++this_mode) {

       int rate_mv = 0;

       if (cpi->sf.disable_inter_mode_mask[bsize] &

           (1 << INTER_OFFSET(this_mode)))

+        continue;

+

+      if (best_rd < ((int64_t)rd_threshes[mode_idx[this_mode]] *

+          rd_thresh_freq_fact[this_mode] >> 5) ||

+          rd_threshes[mode_idx[this_mode]] == INT_MAX)

         continue;

       if (this_mode == NEWMV) {

-- 

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