shithub: libvpx

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Allow lossless breakout in non-rd mode decision.

This is very helpful for large moving windows in screencasts.

Change-Id: I91b5f9acb133281ee85ccd8f843e6bae5cadefca

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

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

@@ -370,7 +370,7 @@

       // Skipping checking: test to see if this block can be reconstructed by

       // prediction only.

-      if (cpi->allow_encode_breakout && x->encode_breakout) {

+      if (cpi->allow_encode_breakout) {

         const BLOCK_SIZE uv_size = get_plane_block_size(bsize, &xd->plane[1]);

         unsigned int var = var_y, sse = sse_y;

         // Skipping threshold for ac.

@@ -377,22 +377,28 @@

         unsigned int thresh_ac;

         // Skipping threshold for dc.

         unsigned int thresh_dc;

-        // Set a maximum for threshold to avoid big PSNR loss in low bit rate

-        // case. Use extreme low threshold for static frames to limit skipping.

-        const unsigned int max_thresh = 36000;

-        // The encode_breakout input

-        const unsigned int min_thresh =

-            MIN(((unsigned int)x->encode_breakout << 4), max_thresh);

+        if (x->encode_breakout > 0) {

+          // Set a maximum for threshold to avoid big PSNR loss in low bit rate

+          // case. Use extreme low threshold for static frames to limit

+          // skipping.

+          const unsigned int max_thresh = 36000;

+          // The encode_breakout input

+          const unsigned int min_thresh =

+              MIN(((unsigned int)x->encode_breakout << 4), max_thresh);

-        // Calculate threshold according to dequant value.

-        thresh_ac = (xd->plane[0].dequant[1] * xd->plane[0].dequant[1]) / 9;

-        thresh_ac = clamp(thresh_ac, min_thresh, max_thresh);

+          // Calculate threshold according to dequant value.

+          thresh_ac = (xd->plane[0].dequant[1] * xd->plane[0].dequant[1]) / 9;

+          thresh_ac = clamp(thresh_ac, min_thresh, max_thresh);

-        // Adjust ac threshold according to partition size.

-        thresh_ac >>= 8 - (b_width_log2_lookup[bsize] +

-            b_height_log2_lookup[bsize]);

+          // Adjust ac threshold according to partition size.

+          thresh_ac >>=

+              8 - (b_width_log2_lookup[bsize] + b_height_log2_lookup[bsize]);

-        thresh_dc = (xd->plane[0].dequant[0] * xd->plane[0].dequant[0] >> 6);

+          thresh_dc = (xd->plane[0].dequant[0] * xd->plane[0].dequant[0] >> 6);

+        } else {

+          thresh_ac = 0;

+          thresh_dc = 0;

+        }

         // Y skipping condition checking for ac and dc.

         if (var <= thresh_ac && (sse - var) <= thresh_dc) {