shithub: libvpx

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vp9: Add rc quantity to track amount of low motion in scene.

Use it for now in noise estimation to bypass estimation if
motion level is high.

Change-Id: I033662dc909f2060e4e81abf562a7ad262dc8170

--- a/vp9/encoder/vp9_noise_estimate.c

+++ b/vp9/encoder/vp9_noise_estimate.c

@@ -128,6 +128,14 @@

       ne->last_h = cm->height;

     }

     return;

+  } else if (cpi->rc.avg_frame_low_motion < 50) {

+    // Force noise estimation to 0 and denoiser off if content has high motion.

+    ne->level = kLowLow;

+#if CONFIG_VP9_TEMPORAL_DENOISING

+    if (cpi->oxcf.noise_sensitivity > 0)

+      vp9_denoiser_set_noise_level(&cpi->denoiser, ne->level);

+#endif

+    return;

   } else {

     int num_samples = 0;

     uint64_t avg_est = 0;

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -338,6 +338,7 @@

   rc->total_target_bits = 0;

   rc->total_target_vs_actual = 0;

   rc->avg_intersize_gfint = 0;

+  rc->avg_frame_low_motion = 0;

   rc->frames_since_key = 8;  // Sensible default for first frame.

   rc->this_key_frame_forced = 0;

@@ -1334,6 +1335,26 @@

   }

 }

+static void compute_frame_low_motion(VP9_COMP *const cpi) {

+  VP9_COMMON *const cm = &cpi->common;

+  int mi_row, mi_col;

+  MODE_INFO **mi = cm->mi_grid_visible;

+  RATE_CONTROL *const rc = &cpi->rc;

+  const int rows = cm->mi_rows, cols = cm->mi_cols;

+  int cnt_zeromv = 0;

+  for (mi_row = 0; mi_row < rows; mi_row++) {

+    for (mi_col = 0; mi_col < cols; mi_col++) {

+      if (abs(mi[0]->mv[0].as_mv.row) < 16 &&

+          abs(mi[0]->mv[0].as_mv.col) < 16)

+        cnt_zeromv++;

+      mi++;

+    }

+    mi += 8;

+  }

+  cnt_zeromv = 100 * cnt_zeromv / (rows * cols);

+  rc->avg_frame_low_motion = (3 * rc->avg_frame_low_motion + cnt_zeromv) >> 2;

+}

+

 void vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) {

   const VP9_COMMON *const cm = &cpi->common;

   const VP9EncoderConfig *const oxcf = &cpi->oxcf;

@@ -1447,6 +1468,9 @@

         rc->next_frame_size_selector != rc->frame_size_selector;

     rc->frame_size_selector = rc->next_frame_size_selector;

   }

+

+  if (oxcf->pass == 0 && cm->frame_type != KEY_FRAME)

+    compute_frame_low_motion(cpi);

 }

 void vp9_rc_postencode_update_drop_frame(VP9_COMP *cpi) {

--- a/vp9/encoder/vp9_ratectrl.h

+++ b/vp9/encoder/vp9_ratectrl.h

@@ -163,6 +163,7 @@

   int high_source_sad;

   int count_last_scene_change;

   int avg_intersize_gfint;

+  int avg_frame_low_motion;

 } RATE_CONTROL;

 struct VP9_COMP;