Introducing DecoderBuffer and general Buffer cleanup.

media/base/decoder_buffer_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 "base/string_util.h"
+#include "media/base/decoder_buffer.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+TEST(DecoderBufferTest, Constructors) {
+  const int kTestSize = 10;
+
+  scoped_refptr<DecoderBuffer> buffer(new DecoderBuffer(0));
+  EXPECT_FALSE(buffer->GetData());
+
+  scoped_refptr<DecoderBuffer> buffer2(new DecoderBuffer(kTestSize));
+  ASSERT_TRUE(buffer2);
+  EXPECT_EQ(kTestSize, buffer2->GetDataSize());
+}
+
+TEST(DecoderBufferTest, PaddingAlignment) {
+  scoped_refptr<DecoderBuffer> buffer = DecoderBuffer::CopyFrom(NULL, 0);
+  EXPECT_FALSE(buffer->GetData());
+
+  const char kData[] = "hello";
+  const int kDataSize = arraysize(kData);
+  scoped_refptr<DecoderBuffer> buffer2 = DecoderBuffer::CopyFrom(

[scherkus (not reviewing), 2012/05/26 01:36:32]

it looks like these two CopyFrom() tests be in a separate CopyFrom() tests --
also if you wanted to be sure about a copy you can assert that
buffer2->GetData() ptr != kData

[DaleCurtis, 2012/05/29 21:17:01]

Done.

+      reinterpret_cast<const uint8*>(&kData), kDataSize);
+  ASSERT_TRUE(buffer2);
+  EXPECT_EQ(buffer2->GetDataSize(), kDataSize);
+  ASSERT_EQ(0, memcmp(buffer2->GetData(), kData, kDataSize));
+
+#if !defined(OS_ANDROID)

[scherkus (not reviewing), 2012/05/26 01:36:32]

then for a PaddingAlignment test I would #if the whole test so it doesn't even
run on android

[DaleCurtis, 2012/05/29 21:17:01]

Done.

+  // If we're using FFmpeg, I should be able to poke past the end of the data by
+  // FF_INPUT_BUFFER_PADDING_SIZE bytes without blowing up anything.
+  memset(

[scherkus (not reviewing), 2012/05/26 01:36:32]

since the area past is supposed to be zeros and because writing doesn't always
trigger a crash, how about writing a for loop that goes from GetWritableData() +
kDataSize and writes+reads 0xff?

[DaleCurtis, 2012/05/29 21:17:01]

Done.

+      buffer2->GetWritableData() + kDataSize, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+
+  // These alignments will need to be updated to match FFmpeg when it changes.

[scherkus (not reviewing), 2012/05/26 01:36:32]

OOC is it expected to change?

[DaleCurtis, 2012/05/29 21:17:01]

Probably if we ever get 512bit SIMD instructions :)

+#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