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/common/entropymode.c

diff --git a/av1/common/entropymode.c b/av1/common/entropymode.c
index 0d2d1ed..7d24619 100644
--- a/av1/common/entropymode.c
+++ b/av1/common/entropymode.c
@@ -6160,6 +6160,28 @@
     };
 #endif  // CONFIG_LPF_SB
 
+#if CONFIG_EXT_INTRA_MOD
+const aom_cdf_prob default_angle_delta_cdf[DIRECTIONAL_MODES][CDF_SIZE(
+    2 * MAX_ANGLE_DELTA + 1)] = {
+  { AOM_ICDF(2340), AOM_ICDF(5327), AOM_ICDF(7611), AOM_ICDF(23102),
+    AOM_ICDF(27196), AOM_ICDF(30546), AOM_ICDF(32768), 0 },
+  { AOM_ICDF(3267), AOM_ICDF(8071), AOM_ICDF(11970), AOM_ICDF(21822),
+    AOM_ICDF(25619), AOM_ICDF(30034), AOM_ICDF(32768), 0 },
+  { AOM_ICDF(3417), AOM_ICDF(9937), AOM_ICDF(12286), AOM_ICDF(16420),
+    AOM_ICDF(19941), AOM_ICDF(30669), AOM_ICDF(32768), 0 },
+  { AOM_ICDF(5167), AOM_ICDF(11735), AOM_ICDF(15254), AOM_ICDF(16662),
+    AOM_ICDF(20697), AOM_ICDF(28276), AOM_ICDF(32768), 0 },
+  { AOM_ICDF(1728), AOM_ICDF(10973), AOM_ICDF(14103), AOM_ICDF(18547),
+    AOM_ICDF(22684), AOM_ICDF(27007), AOM_ICDF(32768), 0 },
+  { AOM_ICDF(2764), AOM_ICDF(10700), AOM_ICDF(12517), AOM_ICDF(16957),
+    AOM_ICDF(20590), AOM_ICDF(30390), AOM_ICDF(32768), 0 },
+  { AOM_ICDF(2407), AOM_ICDF(12749), AOM_ICDF(16527), AOM_ICDF(20823),
+    AOM_ICDF(22781), AOM_ICDF(29642), AOM_ICDF(32768), 0 },
+  { AOM_ICDF(3068), AOM_ICDF(10132), AOM_ICDF(12079), AOM_ICDF(16542),
+    AOM_ICDF(19943), AOM_ICDF(30448), AOM_ICDF(32768), 0 }
+};
+#endif  // CONFIG_EXT_INTRA_MOD
+
 static void init_mode_probs(FRAME_CONTEXT *fc) {
   av1_copy(fc->partition_prob, default_partition_probs);
   av1_copy(fc->intra_inter_prob, default_intra_inter_p);
@@ -6169,6 +6191,9 @@
   av1_copy(fc->palette_y_color_index_cdf, default_palette_y_color_index_cdf);
   av1_copy(fc->palette_uv_color_index_cdf, default_palette_uv_color_index_cdf);
   av1_copy(fc->kf_y_cdf, default_kf_y_mode_cdf);
+#if CONFIG_EXT_INTRA_MOD
+  av1_copy(fc->angle_delta_cdf, default_angle_delta_cdf);
+#endif  // CONFIG_EXT_INTRA_MOD
 #if CONFIG_MRC_TX
   av1_copy(fc->mrc_mask_inter_cdf, default_mrc_mask_inter_cdf);
   av1_copy(fc->mrc_mask_intra_cdf, default_mrc_mask_intra_cdf);