Add VP9 raw bits reader

media/filters/vp9_raw_bits_reader_unittest.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 "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+TEST(Vp9RawBitsReaderTest, ReadBit) {
+  uint8_t data[] = {0xf1};
+  Vp9RawBitsReader reader;
+  reader.Initialize(data, 1);
+
+  EXPECT_TRUE(reader.IsValid());
+  EXPECT_EQ(0u, reader.GetBytesRead());
+  EXPECT_EQ(1, reader.ReadBit());
+  EXPECT_EQ(1u, reader.GetBytesRead());
+  EXPECT_EQ(1, reader.ReadBit());
+  EXPECT_EQ(1, reader.ReadBit());
+  EXPECT_EQ(1, reader.ReadBit());
+  EXPECT_EQ(0, reader.ReadBit());
+  EXPECT_EQ(0, reader.ReadBit());
+  EXPECT_EQ(0, reader.ReadBit());
+  EXPECT_EQ(1, reader.ReadBit());
+  EXPECT_TRUE(reader.IsValid());
+
+  // The return value is undefined.
+  ignore_result(reader.ReadBit());
+  EXPECT_FALSE(reader.IsValid());
+  EXPECT_EQ(1u, reader.GetBytesRead());
+}
+
+TEST(Vp9RawBitsReader, ReadLiteral) {
+  uint8_t data[] = {0x3d, 0x67, 0x9a};
+  Vp9RawBitsReader reader;
+  reader.Initialize(data, 3);
+
+  EXPECT_TRUE(reader.IsValid());
+  EXPECT_EQ(0x03, reader.ReadLiteral(4));
+  EXPECT_EQ(0xd679, reader.ReadLiteral(16));
+  EXPECT_TRUE(reader.IsValid());
+
+  // The return value is undefined.
+  ignore_result(reader.ReadLiteral(8));
+  EXPECT_FALSE(reader.IsValid());
+  EXPECT_EQ(3u, reader.GetBytesRead());
+}
+
+TEST(Vp9RawBitsReader, ReadSignedLiteral) {
+  uint8_t data[] = {0x3d, 0x67, 0x9a};
+  Vp9RawBitsReader reader;
+  reader.Initialize(data, 3);
+
+  EXPECT_TRUE(reader.IsValid());
+  EXPECT_EQ(-0x03, reader.ReadSignedLiteral(4));
+  EXPECT_EQ(-0x5679, reader.ReadSignedLiteral(15));
+  EXPECT_TRUE(reader.IsValid());
+
+  // The return value is undefined.
+  ignore_result(reader.ReadSignedLiteral(7));
+  EXPECT_FALSE(reader.IsValid());
+  EXPECT_EQ(3u, reader.GetBytesRead());
+}
+
+}  // namespace media