shithub: libvpx

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Add marker bit to bool-coded partition start

Adds a marker bit to allow distinguishing the frame header from its residual
data.

Change-Id: Id75d47acc9e5a97007e4690c4f8748a4ce63e641

--- a/test/vp9_boolcoder_test.cc

+++ b/test/vp9_boolcoder_test.cc

@@ -68,6 +68,9 @@

         vp9_stop_encode(&bw);

+        // First bit should be zero

+        GTEST_ASSERT_EQ(bw_buffer[0] & 0x80, 0);

+

         vp9_reader br;

         vp9_reader_init(&br, bw_buffer, buffer_size);

         bit_rnd.Reset(random_seed);

--- a/vp9/decoder/vp9_dboolhuff.c

+++ b/vp9/decoder/vp9_dboolhuff.c

@@ -14,6 +14,8 @@

 #include "vp9/decoder/vp9_dboolhuff.h"

 int vp9_reader_init(vp9_reader *r, const uint8_t *buffer, size_t size) {

+  int marker_bit;

+

   r->buffer_end = buffer + size;

   r->buffer = buffer;

   r->value = 0;

@@ -24,7 +26,8 @@

     return 1;

   vp9_reader_fill(r);

-  return 0;

+  marker_bit = vp9_read_bit(r);

+  return marker_bit != 0;

 }

 void vp9_reader_fill(vp9_reader *r) {

--- a/vp9/encoder/vp9_boolhuff.c

+++ b/vp9/encoder/vp9_boolhuff.c

@@ -47,6 +47,7 @@

   br->count    = -24;

   br->buffer   = source;

   br->pos      = 0;

+  vp9_write_bit(br, 0);

 }

 void vp9_stop_encode(vp9_writer *br) {

-- 

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