shithub: libvpx

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Adjust the vbp early termination threshold slightly

Calculated cpi->vbp_threshold_sad from this frame's dequant value.
The encoding quality and speed didn't change much. Borg test
result: PSNR: -0.002%, SSIM: -0.003%.

Change-Id: I97c9826986f39582f29910d637d08a69c90afdee

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -499,7 +499,8 @@

         cpi->vbp_thresholds[0] = threshold_base;

         cpi->vbp_thresholds[1] = (5 * threshold_base) >> 2;

         cpi->vbp_thresholds[2] = threshold_base << cpi->oxcf.speed;

-        cpi->vbp_threshold_sad = 1000;

+        cpi->vbp_threshold_sad = (cpi->y_dequant[q][1] << 1) > 1000 ?

+            (cpi->y_dequant[q][1] << 1) : 1000;

       }

       cpi->vbp_bsize_min = BLOCK_16X16;

     }