Dynamic resize for real-time: source scaling

Use faster scaling on source.

Change-Id: I968df97239a86834c96126b86832d3d6d0875a53

vp9/encoder/vp9_encoder.c

@@ -19,6 +19,7 @@
 #include "vpx/internal/vpx_psnr.h"
 #include "vpx_ports/mem.h"
 #include "vpx_ports/vpx_timer.h"
+#include "vpx_scale/vpx_scale.h"
 
 #include "vp9/common/vp9_alloccommon.h"
 #include "vp9/common/vp9_filter.h"
@@ -3140,12 +3141,27 @@ static void encode_without_recode_loop(VP9_COMP *cpi) {
 
   set_frame_size(cpi);
 
-  cpi->Source = vp9_scale_if_required(cm, cpi->un_scaled_source,
-                                      &cpi->scaled_source);
-
-  if (cpi->unscaled_last_source != NULL)
-    cpi->Last_Source = vp9_scale_if_required(cm, cpi->unscaled_last_source,
-                                             &cpi->scaled_last_source);
+  // For 1 pass CBR under dynamic resize mode: use faster scaling for source.
+  // Only for 2x2 scaling for now.
+  if (cpi->oxcf.pass == 0 &&
+      cpi->oxcf.rc_mode == VPX_CBR &&
+      cpi->oxcf.resize_mode == RESIZE_DYNAMIC &&
+      cpi->resize_scale_num == 1 &&
+      cpi->resize_scale_den == 2) {
+    cpi->Source = vp9_scale_if_required_fast(cm,
+                                             cpi->un_scaled_source,
+                                             &cpi->scaled_source);
+    if (cpi->unscaled_last_source != NULL)
+       cpi->Last_Source = vp9_scale_if_required_fast(cm,
+                                                     cpi->unscaled_last_source,
+                                                     &cpi->scaled_last_source);
+  } else {
+    cpi->Source = vp9_scale_if_required(cm, cpi->un_scaled_source,
+                                        &cpi->scaled_source);
+    if (cpi->unscaled_last_source != NULL)
+      cpi->Last_Source = vp9_scale_if_required(cm, cpi->unscaled_last_source,
+                                               &cpi->scaled_last_source);
+  }
 
   if (frame_is_intra_only(cm) == 0) {
     vp9_scale_references(cpi);
@@ -3491,6 +3507,21 @@ static void set_ext_overrides(VP9_COMP *cpi) {
   }
 }
 
+YV12_BUFFER_CONFIG *vp9_scale_if_required_fast(VP9_COMMON *cm,
+                                               YV12_BUFFER_CONFIG *unscaled,
+                                               YV12_BUFFER_CONFIG *scaled) {
+  if (cm->mi_cols * MI_SIZE != unscaled->y_width ||
+      cm->mi_rows * MI_SIZE != unscaled->y_height) {
+    // For 2x2 scaling down.
+    vpx_scale_frame(unscaled, scaled, unscaled->y_buffer, 9, 2, 1,
+                    2, 1, 0);
+    vp9_extend_frame_borders(scaled);
+    return scaled;
+  } else {
+    return unscaled;
+  }
+}
+
 YV12_BUFFER_CONFIG *vp9_scale_if_required(VP9_COMMON *cm,
                                           YV12_BUFFER_CONFIG *unscaled,
                                           YV12_BUFFER_CONFIG *scaled) {

vp9/encoder/vp9_encoder.h

@@ -614,6 +614,10 @@ void vp9_update_reference_frames(VP9_COMP *cpi);
 
 void vp9_set_high_precision_mv(VP9_COMP *cpi, int allow_high_precision_mv);
 
+YV12_BUFFER_CONFIG *vp9_scale_if_required_fast(VP9_COMMON *cm,
+                                               YV12_BUFFER_CONFIG *unscaled,
+                                               YV12_BUFFER_CONFIG *scaled);
+
 YV12_BUFFER_CONFIG *vp9_scale_if_required(VP9_COMMON *cm,
                                           YV12_BUFFER_CONFIG *unscaled,
                                           YV12_BUFFER_CONFIG *scaled);