commit 3ca43bf0aee35c25deba512f92dbe67a362619d3
author Joe Young <joeyoung@google.com> Fri Oct 06 15:12:46 2017 -0700
committer Joe Young <joeyoung@google.com> Fri Oct 27 15:20:48 2017 -0700
tree 396b48a8fa14f5e10fc4981cc2bc229c445318cf
parent 88f0dd642cdb07752b2a29b761dd3e5a1d35a7c0

Ext-intra modification/tuning

For ext-intra direcation intra modes:

1. Use neighbor block modes to modify edge filtering strength
   Coding gain (lowres/midres/hdres):
     (8 keyframes)
     PSNR: -0.19 -0.22 -0.10
     SSIM: -0.29 -0.27 -0.13

2. Use context-based cdf to code angle_delta syntax
     (8 keyframes)
     PSNR: -0.20 -0.24 -0.27
     SSIM: -0.29 -0.33 -0.37

3. Filter corner sample:
     (8 keyframes)
     PSNR: -0.01 -0.02 -0.05
     SSIM: -0.03 -0.04 -0.05

Combined Bd-rate improvement for 8 keyframes
     PSNR: -0.40 -0.47 -0.40
     SSIM: -0.57 -0.60 -0.51

Change-Id: Id47ac17b6bf91cd810b70cacfc5b457341f417f3

av1/encoder/encodeframe.c

diff --git a/av1/encoder/encodeframe.c b/av1/encoder/encodeframe.c
index c8bae01..b866250 100644
--- a/av1/encoder/encodeframe.c
+++ b/av1/encoder/encodeframe.c
@@ -4265,10 +4265,32 @@
                FILTER_INTRA_MODES);
   }
 #endif  // CONFIG_FILTER_INTRA
+#if CONFIG_EXT_INTRA && CONFIG_EXT_INTRA_MOD
+  if (av1_is_directional_mode(mbmi->mode, bsize) &&
+      av1_use_angle_delta(bsize)) {
+#if CONFIG_ENTROPY_STATS
+    ++counts->angle_delta[mbmi->mode - V_PRED]
+                         [mbmi->angle_delta[0] + MAX_ANGLE_DELTA];
+#endif
+    update_cdf(fc->angle_delta_cdf[mbmi->mode - V_PRED],
+               mbmi->angle_delta[0] + MAX_ANGLE_DELTA, 2 * MAX_ANGLE_DELTA + 1);
+  }
+#endif  // CONFIG_EXT_INTRA && CONFIG_EXT_INTRA_MOD
 
   if (!is_chroma_reference(mi_row, mi_col, bsize, xd->plane[1].subsampling_x,
                            xd->plane[1].subsampling_y))
     return;
+#if CONFIG_EXT_INTRA && CONFIG_EXT_INTRA_MOD
+  if (av1_is_directional_mode(mbmi->uv_mode, bsize) &&
+      av1_use_angle_delta(bsize)) {
+#if CONFIG_ENTROPY_STATS
+    ++counts->angle_delta[mbmi->uv_mode - V_PRED]
+                         [mbmi->angle_delta[1] + MAX_ANGLE_DELTA];
+#endif
+    update_cdf(fc->angle_delta_cdf[mbmi->uv_mode - V_PRED],
+               mbmi->angle_delta[1] + MAX_ANGLE_DELTA, 2 * MAX_ANGLE_DELTA + 1);
+  }
+#endif  // CONFIG_EXT_INTRA && CONFIG_EXT_INTRA_MOD
 #if CONFIG_ENTROPY_STATS
   ++counts->uv_mode[y_mode][uv_mode];
 #endif  // CONFIG_ENTROPY_STATS