Introducing DecoderBuffer and general Buffer cleanup.

media/base/decoder_buffer_unittest.cc

Index: media/base/decoder_buffer_unittest.cc
diff --git a/media/base/decoder_buffer_unittest.cc b/media/base/decoder_buffer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f7ec5786f0fecc9bb3dd0e52ee1f92ba144486fe
--- /dev/null
+++ b/media/base/decoder_buffer_unittest.cc
@@ -0,0 +1,103 @@
+// 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 "base/string_util.h"
+#include "media/base/decoder_buffer.h"
+#if !defined(OS_ANDROID)
+#include "media/ffmpeg/ffmpeg_common.h"
+#endif
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+TEST(DecoderBufferTest, Constructors) {

[scherkus (not reviewing), 2012/05/30 02:48:42]

these tests use the 1-arg ctor out of convenience -- I wonder if we should
privatize the ctor

+  scoped_refptr<DecoderBuffer> buffer(new DecoderBuffer(0));
+  EXPECT_TRUE(buffer->GetData());
+  EXPECT_EQ(0, buffer->GetDataSize());
+  EXPECT_FALSE(buffer->IsEndOfStream());
+
+  const int kTestSize = 10;
+  scoped_refptr<DecoderBuffer> buffer3(new DecoderBuffer(kTestSize));
+  ASSERT_TRUE(buffer3);
+  EXPECT_EQ(kTestSize, buffer3->GetDataSize());
+}
+
+TEST(DecoderBufferTest, CreateEOSBuffer) {
+  scoped_refptr<DecoderBuffer> buffer(DecoderBuffer::CreateEOSBuffer());
+  EXPECT_TRUE(buffer->IsEndOfStream());
+  EXPECT_FALSE(buffer->GetData());
+  EXPECT_EQ(0, buffer->GetDataSize());
+}
+
+TEST(DecoderBufferTest, CopyFrom) {
+  const uint8 kData[] = "hello";
+  const int kDataSize = arraysize(kData);
+  scoped_refptr<DecoderBuffer> buffer2(DecoderBuffer::CopyFrom(
+      reinterpret_cast<const uint8*>(&kData), kDataSize));
+  ASSERT_TRUE(buffer2);
+  EXPECT_NE(kData, buffer2->GetData());
+  EXPECT_EQ(buffer2->GetDataSize(), kDataSize);
+  EXPECT_EQ(0, memcmp(buffer2->GetData(), kData, kDataSize));
+  EXPECT_FALSE(buffer2->IsEndOfStream());
+}
+
+#if !defined(OS_ANDROID)
+TEST(DecoderBufferTest, PaddingAlignment) {
+  const uint8 kData[] = "hello";
+  const int kDataSize = arraysize(kData);
+  scoped_refptr<DecoderBuffer> buffer2(DecoderBuffer::CopyFrom(
+      reinterpret_cast<const uint8*>(&kData), kDataSize));
+  ASSERT_TRUE(buffer2);
+
+  // FFmpeg padding data should always be zeroed.
+  for(int i = 0; i < FF_INPUT_BUFFER_PADDING_SIZE; i++)
+    EXPECT_EQ((buffer2->GetData() + kDataSize)[i], 0);
+
+  // If the data is padded correctly we should be able to read and write past
+  // the end of the data by FF_INPUT_BUFFER_PADDING_SIZE bytes without crashing
+  // or Valgrind/ASAN throwing errors.
+  const uint8 kFillChar = 0xFF;
+  memset(
+      buffer2->GetWritableData() + kDataSize, kFillChar,
+      FF_INPUT_BUFFER_PADDING_SIZE);
+  for(int i = 0; i < FF_INPUT_BUFFER_PADDING_SIZE; i++)
+    EXPECT_EQ((buffer2->GetData() + kDataSize)[i], kFillChar);
+
+  // These alignments will need to be updated to match FFmpeg when it changes.
+#if defined(ARCH_CPU_ARM_FAMILY)
+  // FFmpeg data should be aligned on a 16 byte boundary for ARM.
+  const int kDataAlignment = 16;
+#else
+  // FFmpeg data should be aligned on a 32 byte boundary for x86.
+  const int kDataAlignment = 32;
+#endif
+  EXPECT_EQ(0u, reinterpret_cast<uintptr_t>(
+      buffer2->GetData()) & (kDataAlignment - 1));
+}
+#endif
+
+TEST(DecoderBufferTest, ReadingWriting) {
+  const char kData[] = "hello";
+  const int kDataSize = arraysize(kData);
+
+  scoped_refptr<DecoderBuffer> buffer(new DecoderBuffer(kDataSize));
+  ASSERT_TRUE(buffer);
+
+  uint8* data = buffer->GetWritableData();
+  ASSERT_TRUE(data);
+  ASSERT_EQ(kDataSize, buffer->GetDataSize());
+  memcpy(data, kData, kDataSize);
+  const uint8* read_only_data = buffer->GetData();
+  ASSERT_EQ(data, read_only_data);
+  ASSERT_EQ(0, memcmp(read_only_data, kData, kDataSize));
+  EXPECT_FALSE(buffer->IsEndOfStream());
+}
+
+TEST(DecoderBufferTest, GetDecryptConfig) {
+  scoped_refptr<DecoderBuffer> buffer(new DecoderBuffer(0));
+  EXPECT_FALSE(buffer->GetDecryptConfig());
+}
+
+}  // namespace media