shithub: libvpx

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vp9-rtc: Increase resize down limit to 320x180

For RTC dynamic resize: don't allow resize for
resoln <= 320x180.

Change-Id: I9109e9e1338e5420e72436a57d266ae46e9f2d60

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

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

@@ -2657,8 +2657,8 @@

   RESIZE_ACTION resize_action = NO_RESIZE;

   int avg_qp_thr1 = 70;

   int avg_qp_thr2 = 50;

-  int min_width = 180;

-  int min_height = 90;

+  int min_width = 320;

+  int min_height = 180;

   int down_size_on = 1;

   cpi->resize_scale_num = 1;

   cpi->resize_scale_den = 1;

@@ -2669,19 +2669,8 @@

     return 0;

   }

-  // Check current frame reslution to avoid generating frames smaller than

-  // the minimum resolution.

-  if (ONEHALFONLY_RESIZE) {

-    if ((cm->width >> 1) < min_width || (cm->height >> 1) < min_height)

-      down_size_on = 0;

-  } else {

-    if (cpi->resize_state == ORIG &&

-        (cm->width * 3 / 4 < min_width || cm->height * 3 / 4 < min_height))

-      return 0;

-    else if (cpi->resize_state == THREE_QUARTER &&

-             (cm->width * 3 / 4 < min_width || cm->height * 3 / 4 < min_height))

-      down_size_on = 0;

-  }

+  // No resizing down if frame size is below some limit.

+  if (cm->width * cm->height <= min_width * min_height) down_size_on = 0;

 #if CONFIG_VP9_TEMPORAL_DENOISING

   // If denoiser is on, apply a smaller qp threshold.

@@ -2707,8 +2696,9 @@

       // Resize back up if average QP is low, and we are currently in a resized

       // down state, i.e. 1/2 or 3/4 of original resolution.

       // Currently, use a flag to turn 3/4 resizing feature on/off.

-      if (cpi->resize_buffer_underflow > (cpi->resize_count >> 2)) {

-        if (cpi->resize_state == THREE_QUARTER && down_size_on) {

+      if (cpi->resize_buffer_underflow > (cpi->resize_count >> 2) &&

+          down_size_on) {

+        if (cpi->resize_state == THREE_QUARTER) {

           resize_action = DOWN_ONEHALF;

           cpi->resize_state = ONE_HALF;

         } else if (cpi->resize_state == ORIG) {