From 9e5bb9598c57eccd9115080e1a6b1375b82a77e3 Mon Sep 17 00:00:00 2001
From: Adrian Grange <agrange@google.com>
Date: Wed, 29 May 2013 17:16:00 -0700
Subject: Add intra_only and reset_frame_context flags

Added two flags to the frame header:

intra_only:
Signals that the frame is encoded using only INTRA
coding modes.

reset_frame_context:
Indicates that the coding context specified
in the frame header should be reset to default values before the
frame is encoded/decoded.

Change-Id: I182d46f1f84fb67a13c46ad767f246a38d7861a2
---
 vp9/common/vp9_onyxc_int.h   | 6 ++++++
 vp9/decoder/vp9_decodframe.c | 9 +++++++++
 vp9/encoder/vp9_bitstream.c  | 6 +++++-
 vp9/encoder/vp9_onyx_if.c    | 4 ++++
 4 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/vp9/common/vp9_onyxc_int.h b/vp9/common/vp9_onyxc_int.h
index b148a6377..ac190059b 100644
--- a/vp9/common/vp9_onyxc_int.h
+++ b/vp9/common/vp9_onyxc_int.h
@@ -154,6 +154,12 @@ typedef struct VP9Common {
   int show_frame;
   int last_show_frame;
 
+  // Flag signaling that the frame is encoded using only INTRA modes.
+  int intra_only;
+
+  // Flag signaling that the frame context should be reset to default values.
+  int reset_frame_context;
+
   int frame_flags;
   // MBs, mb_rows/cols is in 16-pixel units; mi_rows/cols is in
   // MODE_INFO (8-pixel) units.
diff --git a/vp9/decoder/vp9_decodframe.c b/vp9/decoder/vp9_decodframe.c
index a4a8226a0..6f303d1c9 100644
--- a/vp9/decoder/vp9_decodframe.c
+++ b/vp9/decoder/vp9_decodframe.c
@@ -955,16 +955,25 @@ size_t read_uncompressed_header(VP9D_COMP *pbi,
                            "Invalid frame sync code");
     }
   }
+
   setup_frame_size(pbi, scaling_active, rb);
 
+  if (!cm->show_frame) {
+    cm->intra_only = vp9_rb_read_bit(rb);
+  } else {
+    cm->intra_only = 0;
+  }
+
   cm->frame_context_idx = vp9_rb_read_literal(rb, NUM_FRAME_CONTEXTS_LG2);
   cm->clr_type = (YUV_TYPE)vp9_rb_read_bit(rb);
 
   cm->error_resilient_mode = vp9_rb_read_bit(rb);
   if (!cm->error_resilient_mode) {
+    cm->reset_frame_context = vp9_rb_read_bit(rb);
     cm->refresh_frame_context = vp9_rb_read_bit(rb);
     cm->frame_parallel_decoding_mode = vp9_rb_read_bit(rb);
   } else {
+    cm->reset_frame_context = 0;
     cm->refresh_frame_context = 0;
     cm->frame_parallel_decoding_mode = 1;
   }
diff --git a/vp9/encoder/vp9_bitstream.c b/vp9/encoder/vp9_bitstream.c
index 13bfe2134..6ae6685f6 100644
--- a/vp9/encoder/vp9_bitstream.c
+++ b/vp9/encoder/vp9_bitstream.c
@@ -1482,7 +1482,6 @@ static void encode_segmentation(VP9_COMP *cpi, vp9_writer *w) {
   }
 }
 
-
 void write_uncompressed_header(VP9_COMMON *cm,
                                struct vp9_write_bit_buffer *wb) {
   const int scaling_active = cm->width != cm->display_width ||
@@ -1509,11 +1508,16 @@ void write_uncompressed_header(VP9_COMMON *cm,
   vp9_wb_write_literal(wb, cm->width, 16);
   vp9_wb_write_literal(wb, cm->height, 16);
 
+  if (!cm->show_frame) {
+      vp9_wb_write_bit(wb, cm->intra_only);
+  }
+
   vp9_wb_write_literal(wb, cm->frame_context_idx, NUM_FRAME_CONTEXTS_LG2);
   vp9_wb_write_bit(wb, cm->clr_type);
 
   vp9_wb_write_bit(wb, cm->error_resilient_mode);
   if (!cm->error_resilient_mode) {
+    vp9_wb_write_bit(wb, cm->reset_frame_context);
     vp9_wb_write_bit(wb, cm->refresh_frame_context);
     vp9_wb_write_bit(wb, cm->frame_parallel_decoding_mode);
   }
diff --git a/vp9/encoder/vp9_onyx_if.c b/vp9/encoder/vp9_onyx_if.c
index e2f24848f..cafb43e74 100644
--- a/vp9/encoder/vp9_onyx_if.c
+++ b/vp9/encoder/vp9_onyx_if.c
@@ -1191,6 +1191,7 @@ void vp9_change_config(VP9_PTR ptr, VP9_CONFIG *oxcf) {
   cpi->refresh_golden_frame = 0;
   cpi->refresh_last_frame = 1;
   cm->refresh_frame_context = 1;
+  cm->reset_frame_context = 0;
 
   setup_features(cpi);
   cpi->mb.e_mbd.allow_high_precision_mv = 0;   // Default mv precision adaptation
@@ -2618,6 +2619,7 @@ static void encode_frame_to_data_rate(VP9_COMP *cpi,
       (cpi->oxcf.frame_parallel_decoding_mode != 0);
     if (cm->error_resilient_mode) {
       cm->frame_parallel_decoding_mode = 1;
+      cm->reset_frame_context = 0;
       cm->refresh_frame_context = 0;
     }
   }
@@ -3675,6 +3677,7 @@ int vp9_get_compressed_data(VP9_PTR ptr, unsigned int *frame_flags,
       }
 
       cm->show_frame = 0;
+      cm->intra_only = 0;
       cpi->refresh_alt_ref_frame = 1;
       cpi->refresh_golden_frame = 0;
       cpi->refresh_last_frame = 0;
@@ -3879,6 +3882,7 @@ int vp9_get_compressed_data(VP9_PTR ptr, unsigned int *frame_flags,
     cpi->droppable = !frame_is_reference(cpi);
 
     // return to normal state
+    cm->reset_frame_context = 0;
     cm->refresh_frame_context = 1;
     cpi->refresh_alt_ref_frame = 0;
     cpi->refresh_golden_frame = 0;
-- 
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