Add a Vp9Parser implementation

media/filters/vp9_raw_bits_reader.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/filters/vp9_raw_bits_reader.h"
 
 #include <limits.h>
 
 #include "base/logging.h"
 #include "media/base/bit_reader.h"
 
 namespace media {
 
 Vp9RawBitsReader::Vp9RawBitsReader() : valid_(true) {}
 
 Vp9RawBitsReader::~Vp9RawBitsReader() {}
 
 void Vp9RawBitsReader::Initialize(const uint8_t* data, size_t size) {
   DCHECK(data);
   reader_.reset(new BitReader(data, size));
   valid_ = true;
 }
 
-int Vp9RawBitsReader::ReadBit() {
+bool Vp9RawBitsReader::ReadBool() {
   DCHECK(reader_);
   int value = 0;
   valid_ = valid_ && reader_->ReadBits(1, &value);
-  return value;
+  return value == 1;
 }
 
 int Vp9RawBitsReader::ReadLiteral(int bits) {
   DCHECK(reader_);
   int value = 0;
   DCHECK_LT(static_cast<size_t>(bits), sizeof(value) * 8);
   valid_ = valid_ && reader_->ReadBits(bits, &value);
   return value;
 }
 
 int Vp9RawBitsReader::ReadSignedLiteral(int bits) {
   int value = ReadLiteral(bits);
-  return ReadBit() ? -value : value;
+  return ReadBool() ? -value : value;
 }
 
 size_t Vp9RawBitsReader::GetBytesRead() const {
   DCHECK(reader_);
   return (reader_->bits_read() + 7) / 8;
 }
 
 }  // namespace media