From a5af392aaec8f91d62ab68812f090697b06cce33 Mon Sep 17 00:00:00 2001
From: hui su <huisu@google.com>
Date: Wed, 15 Jun 2016 11:39:41 -0700
Subject: Add a hardware compatibility feature

This commit adds an encoder workaround to support better
compatibility with a non-compliant hardware vp9 profile 2 decoder.

The known issue with this decoder is:
The decoder assumes a wrong value, 127 instead of the correct
value of 511 and 2047, for any assumed top-left corner pixel in
UV planes for 10 and 12 bit, respectively. Such assumed
top-left corner pixel is used for INTRA prediction when a real
decoded/reconstructed pixel is not avalable, e.g. when it is
located inside the row above the top row or inside the column
left to the leftest column of a video image.

Change-Id: Ic15a938a3107e1b85e96cb7903a5c4220986b99d
---
 vp9/common/vp9_common_data.c  | 15 +++++++++++++++
 vp9/common/vp9_common_data.h  |  3 +++
 vp9/decoder/vp9_decodemv.c    |  6 ++++++
 vp9/encoder/vp9_encodeframe.c |  6 ++++++
 vp9/encoder/vp9_rdopt.c       |  5 +++++
 5 files changed, 35 insertions(+)

diff --git a/vp9/common/vp9_common_data.c b/vp9/common/vp9_common_data.c
index a6dae6a1c..3409d0484 100644
--- a/vp9/common/vp9_common_data.c
+++ b/vp9/common/vp9_common_data.c
@@ -159,3 +159,18 @@ const struct {
   {0,  8 },  // 64X32 - {0b0000, 0b1000}
   {0,  0 },  // 64X64 - {0b0000, 0b0000}
 };
+
+#if CONFIG_BETTER_HW_COMPATIBILITY && CONFIG_VP9_HIGHBITDEPTH
+const uint8_t need_top_left[INTRA_MODES] = {
+    0,  // DC_PRED
+    0,  // V_PRED
+    0,  // H_PRED
+    0,  // D45_PRED
+    1,  // D135_PRED
+    1,  // D117_PRED
+    1,  // D153_PRED
+    0,  // D207_PRED
+    0,  // D63_PRED
+    1,  // TM_PRED
+};
+#endif  // CONFIG_BETTER_HW_COMPATIBILITY && CONFIG_VP9_HIGHBITDEPTH
diff --git a/vp9/common/vp9_common_data.h b/vp9/common/vp9_common_data.h
index 95a117961..0ae24dad5 100644
--- a/vp9/common/vp9_common_data.h
+++ b/vp9/common/vp9_common_data.h
@@ -33,6 +33,9 @@ extern const TX_SIZE max_txsize_lookup[BLOCK_SIZES];
 extern const BLOCK_SIZE txsize_to_bsize[TX_SIZES];
 extern const TX_SIZE tx_mode_to_biggest_tx_size[TX_MODES];
 extern const BLOCK_SIZE ss_size_lookup[BLOCK_SIZES][2][2];
+#if CONFIG_BETTER_HW_COMPATIBILITY && CONFIG_VP9_HIGHBITDEPTH
+extern const uint8_t need_top_left[INTRA_MODES];
+#endif  // CONFIG_BETTER_HW_COMPATIBILITY && CONFIG_VP9_HIGHBITDEPTH
 
 #ifdef __cplusplus
 }  // extern "C"
diff --git a/vp9/decoder/vp9_decodemv.c b/vp9/decoder/vp9_decodemv.c
index fe89829a9..ffc6839ad 100644
--- a/vp9/decoder/vp9_decodemv.c
+++ b/vp9/decoder/vp9_decodemv.c
@@ -902,4 +902,10 @@ void vp9_read_mode_info(VP9Decoder *const pbi, MACROBLOCKD *xd,
       frame_mvs += cm->mi_cols;
     }
   }
+#if CONFIG_BETTER_HW_COMPATIBILITY && CONFIG_VP9_HIGHBITDEPTH
+    if ((xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) &&
+        (xd->above_mi == NULL || xd->left_mi == NULL) &&
+        !is_inter_block(mi) && need_top_left[mi->uv_mode])
+      assert(0);
+#endif  // CONFIG_BETTER_HW_COMPATIBILITY && CONFIG_VP9_HIGHBITDEPTH
 }
diff --git a/vp9/encoder/vp9_encodeframe.c b/vp9/encoder/vp9_encodeframe.c
index 2ef9a93d8..984f98a91 100644
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -4443,6 +4443,12 @@ static void encode_superblock(VP9_COMP *cpi, ThreadData *td,
 
   if (!is_inter_block(mi)) {
     int plane;
+#if CONFIG_BETTER_HW_COMPATIBILITY && CONFIG_VP9_HIGHBITDEPTH
+    if ((xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) &&
+        (xd->above_mi == NULL || xd->left_mi == NULL) &&
+        need_top_left[mi->uv_mode])
+      assert(0);
+#endif  // CONFIG_BETTER_HW_COMPATIBILITY && CONFIG_VP9_HIGHBITDEPTH
     mi->skip = 1;
     for (plane = 0; plane < MAX_MB_PLANE; ++plane)
       vp9_encode_intra_block_plane(x, VPXMAX(bsize, BLOCK_8X8), plane, 1);
diff --git a/vp9/encoder/vp9_rdopt.c b/vp9/encoder/vp9_rdopt.c
index a30418286..f15fc31fd 100644
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -1214,6 +1214,11 @@ static int64_t rd_pick_intra_sbuv_mode(VP9_COMP *cpi, MACROBLOCK *x,
   for (mode = DC_PRED; mode <= TM_PRED; ++mode) {
     if (!(cpi->sf.intra_uv_mode_mask[max_tx_size] & (1 << mode)))
       continue;
+#if CONFIG_BETTER_HW_COMPATIBILITY && CONFIG_VP9_HIGHBITDEPTH
+    if ((xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) &&
+        (xd->above_mi == NULL || xd->left_mi == NULL) && need_top_left[mode])
+      continue;
+#endif  // CONFIG_BETTER_HW_COMPATIBILITY && CONFIG_VP9_HIGHBITDEPTH
 
     xd->mi[0]->uv_mode = mode;
 
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