Split the bit reader functionalities from the byte stream provider.

media/base/bit_reader_h264_unittest.cc

 // Copyright (c) 2012 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/base/bit_reader_h264.h"
+
 #include "testing/gtest/include/gtest/gtest.h"
 
-#include "content/common/gpu/media/h264_bit_reader.h"
+namespace media {
 
-using content::H264BitReader;
-
-TEST(H264BitReaderTest, ReadStreamWithoutEscapeAndTrailingZeroBytes) {
-  H264BitReader reader;
+TEST(BitReaderH264Test, ReadStreamWithoutEscapeAndTrailingZeroBytes) {
   const unsigned char rbsp[] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xa0};
   int dummy = 0;
-
-  EXPECT_TRUE(reader.Initialize(rbsp, sizeof(rbsp)));
+  BitReaderH264 reader(rbsp, sizeof(rbsp));
 
   EXPECT_TRUE(reader.ReadBits(1, &dummy));
   EXPECT_EQ(dummy, 0x00);
   EXPECT_EQ(reader.NumBitsLeft(), 47);
   EXPECT_TRUE(reader.HasMoreRBSPData());
 
   EXPECT_TRUE(reader.ReadBits(8, &dummy));
   EXPECT_EQ(dummy, 0x02);
   EXPECT_EQ(reader.NumBitsLeft(), 39);
   EXPECT_TRUE(reader.HasMoreRBSPData());
 
   EXPECT_TRUE(reader.ReadBits(31, &dummy));
   EXPECT_EQ(dummy, 0x23456789);
   EXPECT_EQ(reader.NumBitsLeft(), 8);
   EXPECT_TRUE(reader.HasMoreRBSPData());
 
   EXPECT_TRUE(reader.ReadBits(1, &dummy));
   EXPECT_EQ(dummy, 1);
   EXPECT_EQ(reader.NumBitsLeft(), 7);
   EXPECT_TRUE(reader.HasMoreRBSPData());
 
   EXPECT_TRUE(reader.ReadBits(1, &dummy));
   EXPECT_EQ(dummy, 0);
   EXPECT_EQ(reader.NumBitsLeft(), 6);
   EXPECT_FALSE(reader.HasMoreRBSPData());
 }
 
-TEST(H264BitReaderTest, SingleByteStream) {
-  H264BitReader reader;
+TEST(BitReaderH264Test, SingleByteStream) {
   const unsigned char rbsp[] = {0x18};
   int dummy = 0;
+  BitReaderH264 reader(rbsp, sizeof(rbsp));
 
-  EXPECT_TRUE(reader.Initialize(rbsp, sizeof(rbsp)));
   EXPECT_EQ(reader.NumBitsLeft(), 8);
   EXPECT_TRUE(reader.HasMoreRBSPData());
 
   EXPECT_TRUE(reader.ReadBits(4, &dummy));
   EXPECT_EQ(dummy, 0x01);
   EXPECT_EQ(reader.NumBitsLeft(), 4);
   EXPECT_FALSE(reader.HasMoreRBSPData());
 }
 
-TEST(H264BitReaderTest, StopBitOccupyFullByte) {
-  H264BitReader reader;
+TEST(BitReaderH264Test, StopBitOccupyFullByte) {
   const unsigned char rbsp[] = {0xab, 0x80};
   int dummy = 0;
+  BitReaderH264 reader(rbsp, sizeof(rbsp));
 
-  EXPECT_TRUE(reader.Initialize(rbsp, sizeof(rbsp)));
   EXPECT_EQ(reader.NumBitsLeft(), 16);
   EXPECT_TRUE(reader.HasMoreRBSPData());
 
   EXPECT_TRUE(reader.ReadBits(8, &dummy));
   EXPECT_EQ(dummy, 0xab);
   EXPECT_EQ(reader.NumBitsLeft(), 8);
   EXPECT_FALSE(reader.HasMoreRBSPData());
 }
+
+TEST(BitReaderH264Test, EmulationPreventionByte) {
+  const unsigned char rbsp[] = {0xac, 0x00, 0x00, 0x03, 0x01, 0x03, 0xdc};
+  int dummy = 0;
+  BitReaderH264 reader(rbsp, sizeof(rbsp));
+
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0xa);
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0xc);
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0x0);
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0x0);
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0x0);
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0x0);
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0x0);
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0x1);
+
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0x0);
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0x3);
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0xd);
+  EXPECT_TRUE(reader.ReadBits(4, &dummy));
+  EXPECT_EQ(dummy, 0xc);
+}
+
+}  // namespace media