shithub: libvpx

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Sample points to reduce encode overhead.

Only noise filter sampled points in first pass to reduce
any first pass speed overhead.

Change-Id: Ic80d4400e59146d1c3332336c4350faf28ff8b17

--- a/vp9/encoder/vp9_firstpass.c

+++ b/vp9/encoder/vp9_firstpass.c

@@ -689,8 +689,9 @@

   int stride = x->plane[0].src.stride;

   int block_noise = 0;

-  for (h = 0; h < height; ++h) {

-    for (w = 0; w < width; ++w) {

+  // Sampled points to reduce cost overhead.

+  for (h = 0; h < height; h += 2) {

+    for (w = 0; w < width; w += 2) {

 #if CONFIG_VP9_HIGHBITDEPTH

       if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH)

         block_noise += fp_highbd_estimate_point_noise(src_ptr, stride);

@@ -703,7 +704,7 @@

     }

     src_ptr += (stride - width);

   }

-  return block_noise;

+  return block_noise << 2;  // Scale << 2 to account for sampling.

 }

 #define INVALID_ROW -1