shithub: libvpx

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Adaptively adjust mode test kick-off thresholds in RTC coding

This commit allows the encoder to increase the mode test kick-off
thresholds if the previous best mode renders all zero quantized
coefficients, thereby saving motion search runs when possible.
The compression performance of speed -5 and -6 is down by -0.446%
and 0.591%, respectively. The runtime of speed -6 is improved by
10% for many test clips.

vidyo1, 1000 kbps
16578 b/f, 40.316 dB, 7873 ms -> 16575 b/f, 40.262 dB, 7126 ms

nik720p, 1000 kbps
33311 b/f, 38.651 dB, 7263 ms -> 33304 b/f, 38.629 dB, 6865 ms

dark720p, 1000 kbps
33331 b/f, 39.718 dB, 13596 ms -> 33324 b/f, 39.651 dB, 12000 ms

mmoving, 1000 kbps
33263 b/f, 40.983 dB, 7566 ms -> 33259 b/f, 40.978 dB, 7531 ms

Change-Id: I7591617ff113e91125ec32c9b853e257fbc41d90

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

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

@@ -530,7 +530,7 @@

   static const int flag_list[4] = { 0, VP9_LAST_FLAG, VP9_GOLD_FLAG,

                                     VP9_ALT_FLAG };

   RD_COST this_rdc, best_rdc;

-  uint8_t skip_txfm = 0;

+  uint8_t skip_txfm = 0, best_mode_skip_txfm = 0;

   // var_y and sse_y are saved to be used in skipping checking

   unsigned int var_y = UINT_MAX;

   unsigned int sse_y = UINT_MAX;

@@ -678,7 +678,8 @@

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

         continue;

-      mode_rd_thresh = rd_threshes[mode_index];

+      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,

                               rd_thresh_freq_fact[mode_index]))

         continue;

@@ -809,7 +810,7 @@

         best_pred_filter = mbmi->interp_filter;

         best_tx_size = mbmi->tx_size;

         best_ref_frame = ref_frame;

-        skip_txfm = x->skip_txfm[0];

+        best_mode_skip_txfm = x->skip_txfm[0];

         if (reuse_inter_pred) {

           free_pred_buffer(best_pred);

@@ -837,7 +838,7 @@

   mbmi->ref_frame[0]  = best_ref_frame;

   mbmi->mv[0].as_int  = frame_mv[best_mode][best_ref_frame].as_int;

   xd->mi[0].src_mi->bmi[0].as_mv[0].as_int = mbmi->mv[0].as_int;

-  x->skip_txfm[0] = skip_txfm;

+  x->skip_txfm[0] = best_mode_skip_txfm;

   // Perform intra prediction search, if the best SAD is above a certain

   // threshold.

@@ -887,7 +888,7 @@

         mbmi->uv_mode = this_mode;

         mbmi->mv[0].as_int = INVALID_MV;

       } else {

-        x->skip_txfm[0] = skip_txfm;

+        x->skip_txfm[0] = best_mode_skip_txfm;

         mbmi->tx_size = saved_tx_size;

       }

     }

-- 

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