shithub: libvpx

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vp9-rtc: Some adjustments for low-resolns real-time

Force smooth_interpol filter for low resolutions at high Q,
avoid the loopfilter strength reduction for similar conditon,
and reduce thresh_motion for cyclic refresh turnoff.

Change-Id: I4e9121d1cdc7d1b04992c741dc4f0cec281592f7

--- a/vp9/encoder/vp9_aq_cyclicrefresh.c

+++ b/vp9/encoder/vp9_aq_cyclicrefresh.c

@@ -478,7 +478,7 @@

   int target_refresh = 0;

   double weight_segment_target = 0;

   double weight_segment = 0;

-  int thresh_low_motion = (cm->width < 720) ? 55 : 20;

+  int thresh_low_motion = 20;

   int qp_thresh = VPXMIN((cpi->oxcf.content == VP9E_CONTENT_SCREEN) ? 35 : 20,

                          rc->best_quality << 1);

   cr->apply_cyclic_refresh = 1;

--- a/vp9/encoder/vp9_picklpf.c

+++ b/vp9/encoder/vp9_picklpf.c

@@ -179,6 +179,7 @@

 #endif  // CONFIG_VP9_HIGHBITDEPTH

     if (cpi->oxcf.pass == 0 && cpi->oxcf.rc_mode == VPX_CBR &&

         cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled &&

+        (cm->base_qindex < 200 || cm->width * cm->height > 320 * 240) &&

         cpi->oxcf.content != VP9E_CONTENT_SCREEN && cm->frame_type != KEY_FRAME)

       filt_guess = 5 * filt_guess >> 3;

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

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

@@ -1442,7 +1442,7 @@

                               int mi_row, int mi_col, PRED_BUFFER *tmp,

                               BLOCK_SIZE bsize, int reuse_inter_pred,

                               PRED_BUFFER **this_mode_pred, unsigned int *var_y,

-                              unsigned int *sse_y) {

+                              unsigned int *sse_y, int force_smooth_filter) {

   MACROBLOCKD *const xd = &x->e_mbd;

   MODE_INFO *const mi = xd->mi[0];

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

@@ -1458,8 +1458,8 @@

   INTERP_FILTER best_filter = SWITCHABLE, filter;

   PRED_BUFFER *current_pred = *this_mode_pred;

   uint8_t skip_txfm = SKIP_TXFM_NONE;

-

-  for (filter = EIGHTTAP; filter <= EIGHTTAP_SMOOTH; ++filter) {

+  INTERP_FILTER filter_start = force_smooth_filter ? EIGHTTAP_SMOOTH : EIGHTTAP;

+  for (filter = filter_start; filter <= EIGHTTAP_SMOOTH; ++filter) {

     int64_t cost;

     mi->interp_filter = filter;

     vp9_build_inter_predictors_sby(xd, mi_row, mi_col, bsize);

@@ -1700,6 +1700,11 @@

   int no_scaling = 0;

   unsigned int thresh_svc_skip_golden = 500;

   unsigned int thresh_skip_golden = 500;

+  int force_smooth_filter =

+      (cpi->oxcf.speed >= 8 && cm->width * cm->height <= 320 * 240 &&

+       cm->base_qindex >= 200)

+          ? 1

+          : 0;

   int scene_change_detected =

       cpi->rc.high_source_sad ||

       (cpi->use_svc && cpi->svc.high_source_sad_superframe);

@@ -2225,7 +2230,8 @@

         (((mi->mv[0].as_mv.row | mi->mv[0].as_mv.col) & 0x07) != 0)) {

       rd_computed = 1;

       search_filter_ref(cpi, x, &this_rdc, mi_row, mi_col, tmp, bsize,

-                        reuse_inter_pred, &this_mode_pred, &var_y, &sse_y);

+                        reuse_inter_pred, &this_mode_pred, &var_y, &sse_y,

+                        force_smooth_filter);

     } else {

       // For low motion content use x->sb_is_skin in addition to VeryHighSad

       // for setting large_block.