BufferedDataSource: don't reallocate buffer unnecessarily

media/blink/buffered_data_source.h

 // Copyright 2013 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.
 
 #ifndef MEDIA_BLINK_BUFFERED_DATA_SOURCE_H_
 #define MEDIA_BLINK_BUFFERED_DATA_SOURCE_H_
 
 #include <string>
+#include <vector>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "media/base/data_source.h"
 #include "media/base/media_export.h"
 #include "media/base/ranges.h"
 #include "media/blink/buffered_resource_loader.h"
 #include "url/gurl.h"
 
@@ skipping 170 matching lines @@
   // This buffer is intermediate, we use it for BufferedResourceLoader to write
   // to. And when read in BufferedResourceLoader is done, we copy data from
   // this buffer to |read_buffer_|. The reason for an additional copy is that
   // we don't own |read_buffer_|. But since the read operation is asynchronous,
   // |read_buffer| can be destroyed at any time, so we only copy into
   // |read_buffer| in the final step when it is safe.
   // Memory is allocated for this member during initialization of this object
   // because we want buffer to be passed into BufferedResourceLoader to be
   // always non-null. And by initializing this member with a default size we can
   // avoid creating zero-sized buffered if the first read has zero size.
-  scoped_ptr<uint8[]> intermediate_read_buffer_;
-  int intermediate_read_buffer_size_;
+  std::vector<uint8> intermediate_read_buffer_;
 
   // The task runner of the render thread.
   const scoped_refptr<base::SingleThreadTaskRunner> render_task_runner_;
 
   // Protects |stop_signal_received_| and |read_op_|.
   base::Lock lock_;
 
   // Whether we've been told to stop via Abort() or Stop().
   bool stop_signal_received_;
 
@@ skipping 20 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<BufferedDataSource> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BufferedDataSource);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_BUFFERED_DATA_SOURCE_H_