Merge "Early termination in encoding partition search"

vp9/encoder/vp9_context_tree.h

@@ -34,6 +34,9 @@ typedef struct {
   int num_4x4_blk;
   int skip;
   int skip_txfm[MAX_MB_PLANE];
+  // For current partition, only if all Y, U, and V transform blocks'
+  // coefficients are quantized to 0, skippable is set to 0.
+  int skippable;
   int best_mode_index;
   int hybrid_pred_diff;
   int comp_pred_diff;

vp9/encoder/vp9_encodeframe.c

@@ -727,6 +727,7 @@ static void rd_pick_sb_modes(VP9_COMP *cpi, const TileInfo *const tile,
     p[i].eobs = ctx->eobs_pbuf[i][0];
   }
   ctx->is_coded = 0;
+  ctx->skippable = 0;
   x->skip_recode = 0;
 
   // Set to zero to make sure we do not use the previous encoded frame stats
@@ -2158,8 +2159,8 @@ static void rd_pick_partition(VP9_COMP *cpi, const TileInfo *const tile,
       sum_rd = RDCOST(x->rdmult, x->rddiv, this_rate, this_dist);
 
       if (sum_rd < best_rd) {
-        int64_t stop_thresh = 4096;
-        int64_t stop_thresh_rd;
+        int64_t dist_breakout_thr = cpi->sf.partition_search_breakout_dist_thr;
+        int rate_breakout_thr = cpi->sf.partition_search_breakout_rate_thr;
 
         best_rate = this_rate;
         best_dist = this_dist;
@@ -2167,14 +2168,18 @@ static void rd_pick_partition(VP9_COMP *cpi, const TileInfo *const tile,
         if (bsize >= BLOCK_8X8)
           pc_tree->partitioning = PARTITION_NONE;
 
-        // Adjust threshold according to partition size.
-        stop_thresh >>= 8 - (b_width_log2(bsize) +
+        // Adjust dist breakout threshold according to the partition size.
+        dist_breakout_thr >>= 8 - (b_width_log2(bsize) +
             b_height_log2(bsize));
 
-        stop_thresh_rd = RDCOST(x->rdmult, x->rddiv, 0, stop_thresh);
-        // If obtained distortion is very small, choose current partition
-        // and stop splitting.
-        if (!x->e_mbd.lossless && best_rd < stop_thresh_rd) {
+        // If all y, u, v transform blocks in this partition are skippable, and
+        // the dist & rate are within the thresholds, the partition search is
+        // terminated for current branch of the partition search tree.
+        // The dist & rate thresholds are set to 0 at speed 0 to disable the
+        // early termination at that speed.
+        if (!x->e_mbd.lossless &&
+            (ctx->skippable && best_dist < dist_breakout_thr &&
+            best_rate < rate_breakout_thr)) {
           do_split = 0;
           do_rect = 0;
         }

vp9/encoder/vp9_rdopt.c

@@ -1720,12 +1720,14 @@ static void store_coding_context(MACROBLOCK *x, PICK_MODE_CONTEXT *ctx,
                          int mode_index,
                          int64_t comp_pred_diff[REFERENCE_MODES],
                          const int64_t tx_size_diff[TX_MODES],
-                         int64_t best_filter_diff[SWITCHABLE_FILTER_CONTEXTS]) {
+                         int64_t best_filter_diff[SWITCHABLE_FILTER_CONTEXTS],
+                         int skippable) {
   MACROBLOCKD *const xd = &x->e_mbd;
 
   // Take a snapshot of the coding context so it can be
   // restored if we decide to encode this way
   ctx->skip = x->skip;
+  ctx->skippable = skippable;
   ctx->best_mode_index = mode_index;
   ctx->mic = *xd->mi[0];
   ctx->single_pred_diff = (int)comp_pred_diff[SINGLE_REFERENCE];
@@ -2556,6 +2558,7 @@ int64_t vp9_rd_pick_inter_mode_sb(VP9_COMP *cpi, MACROBLOCK *x,
   int64_t best_filter_rd[SWITCHABLE_FILTER_CONTEXTS];
   int64_t best_filter_diff[SWITCHABLE_FILTER_CONTEXTS];
   MB_MODE_INFO best_mbmode;
+  int best_mode_skippable = 0;
   int mode_index, best_mode_index = -1;
   unsigned int ref_costs_single[MAX_REF_FRAMES], ref_costs_comp[MAX_REF_FRAMES];
   vp9_prob comp_mode_p;
@@ -2963,6 +2966,8 @@ int64_t vp9_rd_pick_inter_mode_sb(VP9_COMP *cpi, MACROBLOCK *x,
         best_rd = this_rd;
         best_mbmode = *mbmi;
         best_skip2 = this_skip2;
+        best_mode_skippable = skippable;
+
         if (!x->select_tx_size)
           swap_block_ptr(x, ctx, 1, 0, 0, max_plane);
         vpx_memcpy(ctx->zcoeff_blk, x->zcoeff_blk[mbmi->tx_size],
@@ -3119,8 +3124,8 @@ int64_t vp9_rd_pick_inter_mode_sb(VP9_COMP *cpi, MACROBLOCK *x,
   }
 
   set_ref_ptrs(cm, xd, mbmi->ref_frame[0], mbmi->ref_frame[1]);
-  store_coding_context(x, ctx, best_mode_index,
-                       best_pred_diff, best_tx_diff, best_filter_diff);
+  store_coding_context(x, ctx, best_mode_index, best_pred_diff,
+                       best_tx_diff, best_filter_diff, best_mode_skippable);
 
   return best_rd;
 }
@@ -3225,7 +3230,7 @@ int64_t vp9_rd_pick_inter_mode_sb_seg_skip(VP9_COMP *cpi, MACROBLOCK *x,
   if (!x->select_tx_size)
     swap_block_ptr(x, ctx, 1, 0, 0, MAX_MB_PLANE);
   store_coding_context(x, ctx, THR_ZEROMV,
-                       best_pred_diff, best_tx_diff, best_filter_diff);
+                       best_pred_diff, best_tx_diff, best_filter_diff, 0);
 
   return this_rd;
 }
@@ -3830,7 +3835,7 @@ int64_t vp9_rd_pick_inter_mode_sub8x8(VP9_COMP *cpi, MACROBLOCK *x,
 
   set_ref_ptrs(cm, xd, mbmi->ref_frame[0], mbmi->ref_frame[1]);
   store_coding_context(x, ctx, best_ref_index,
-                       best_pred_diff, best_tx_diff, best_filter_diff);
+                       best_pred_diff, best_tx_diff, best_filter_diff, 0);
 
   return best_rd;
 }

vp9/encoder/vp9_speed_features.c

@@ -92,6 +92,12 @@ static void set_good_speed_feature(VP9_COMP *cpi, VP9_COMMON *cm,
     sf->intra_uv_mode_mask[TX_16X16] = INTRA_DC_H_V;
 
     sf->tx_size_search_breakout = 1;
+
+    if (MIN(cm->width, cm->height) >= 720)
+      sf->partition_search_breakout_dist_thr = (1 << 23);
+    else
+      sf->partition_search_breakout_dist_thr = (1 << 21);
+    sf->partition_search_breakout_rate_thr = 500;
   }
 
   if (speed >= 2) {
@@ -120,6 +126,12 @@ static void set_good_speed_feature(VP9_COMP *cpi, VP9_COMMON *cm,
     sf->auto_min_max_partition_size = CONSTRAIN_NEIGHBORING_MIN_MAX;
     sf->use_lastframe_partitioning = LAST_FRAME_PARTITION_LOW_MOTION;
     sf->adjust_partitioning_from_last_frame = 1;
+
+    if (MIN(cm->width, cm->height) >= 720)
+      sf->partition_search_breakout_dist_thr = (1 << 24);
+    else
+      sf->partition_search_breakout_dist_thr = (1 << 22);
+    sf->partition_search_breakout_rate_thr = 700;
   }
 
   if (speed >= 3) {
@@ -144,6 +156,12 @@ static void set_good_speed_feature(VP9_COMP *cpi, VP9_COMMON *cm,
     sf->intra_y_mode_mask[TX_32X32] = INTRA_DC;
     sf->intra_uv_mode_mask[TX_32X32] = INTRA_DC;
     sf->adaptive_interp_filter_search = 1;
+
+    if (MIN(cm->width, cm->height) >= 720)
+      sf->partition_search_breakout_dist_thr = (1 << 25);
+    else
+      sf->partition_search_breakout_dist_thr = (1 << 23);
+    sf->partition_search_breakout_rate_thr = 1000;
   }
 
   if (speed >= 4) {
@@ -158,6 +176,12 @@ static void set_good_speed_feature(VP9_COMP *cpi, VP9_COMMON *cm,
     sf->use_lp32x32fdct = 1;
     sf->use_fast_coef_updates = ONE_LOOP_REDUCED;
     sf->use_fast_coef_costing = 1;
+
+    if (MIN(cm->width, cm->height) >= 720)
+      sf->partition_search_breakout_dist_thr = (1 << 26);
+    else
+      sf->partition_search_breakout_dist_thr = (1 << 24);
+    sf->partition_search_breakout_rate_thr = 1500;
   }
 
   if (speed >= 5) {
@@ -411,6 +435,8 @@ void vp9_set_speed_features(VP9_COMP *cpi) {
   sf->recode_tolerance = 25;
   sf->default_interp_filter = SWITCHABLE;
   sf->tx_size_search_breakout = 0;
+  sf->partition_search_breakout_dist_thr = 0;
+  sf->partition_search_breakout_rate_thr = 0;
 
   if (oxcf->mode == REALTIME)
     set_rt_speed_feature(cpi, sf, oxcf->speed, oxcf->content);

vp9/encoder/vp9_speed_features.h

@@ -393,6 +393,10 @@ typedef struct SPEED_FEATURES {
 
   // mask for skip evaluation of certain interp_filter type.
   INTERP_FILTER_MASK interp_filter_search_mask;
+
+  // Partition search early breakout thresholds.
+  int64_t partition_search_breakout_dist_thr;
+  int partition_search_breakout_rate_thr;
 } SPEED_FEATURES;
 
 struct VP9_COMP;