Fixes in AlsaPcmOutputStream.

media/base/seekable_buffer_unittest.cc

 // Copyright (c) 2010 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/logging.h"
 #include "base/scoped_ptr.h"
 #include "base/time.h"
 #include "media/base/data_buffer.h"
 #include "media/base/seekable_buffer.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 204 matching lines @@
   EXPECT_TRUE(buffer_.Seek(-static_cast<int32>(kBufferSize)));
   EXPECT_FALSE(buffer_.Seek(-1));
 
   // Read again.
   for (size_t i = 0; i < kBufferSize; i += kReadSize) {
     EXPECT_EQ(kReadSize, buffer_.Read(write_buffer_, kReadSize));
     EXPECT_EQ(0, memcmp(write_buffer_, data_ + i, kReadSize));
   }
 }
 
+TEST_F(SeekableBufferTest, GetCurrentChunk) {
+  const size_t kSeekSize = kWriteSize / 3;
+
+  scoped_refptr<media::DataBuffer> buffer = new media::DataBuffer(kWriteSize);
+  memcpy(buffer->GetWritableData(), data_, kWriteSize);
+  buffer->SetDataSize(kWriteSize);
+
+  const uint8* data;
+  size_t size;
+  EXPECT_FALSE(buffer_.GetCurrentChunk(&data, &size));
+
+  buffer_.Append(buffer.get());
+  EXPECT_TRUE(buffer_.GetCurrentChunk(&data, &size));
+  EXPECT_EQ(data, buffer->GetData());
+  EXPECT_EQ(size, buffer->GetDataSize());
+
+  buffer_.Seek(kSeekSize);
+  EXPECT_TRUE(buffer_.GetCurrentChunk(&data, &size));
+  EXPECT_EQ(data, buffer->GetData() + kSeekSize);
+  EXPECT_EQ(size, buffer->GetDataSize() - kSeekSize);
+}
+
 TEST_F(SeekableBufferTest, SeekForward) {
   size_t write_position = 0;
   size_t read_position = 0;
   while (read_position < kDataSize) {
     for (int i = 0; i < 10 && write_position < kDataSize; ++i) {
       // Write a random amount of data.
       size_t write_size = GetRandomInt(kBufferSize);
       write_size = std::min(write_size, kDataSize - write_position);
 
       bool should_append = buffer_.Append(data_ + write_position, write_size);
@@ skipping 78 matching lines @@
     EXPECT_EQ(tests[i].expected_time, actual) << "With test = { start:"
         << tests[i].first_time_useconds << ", duration:"
         << tests[i].duration_useconds << ", consumed:"
         << tests[i].consume_bytes << "}\n";
 
     buffer_.Clear();
   }
 }
 
 }  // namespace