Fixes in AlsaPcmOutputStream.

media/base/seekable_buffer.h

 // 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.
 
 // SeekableBuffer to support backward and forward seeking in a buffer for
 // reading a media data source.
 //
 // In order to support backward and forward seeking, this class buffers data in
 // both backward and forward directions, the current read position can be reset
 // to anywhere in the buffered data.
@@ skipping 46 matching lines @@
   // position. Returns the number of bytes read.
   // The current read position will advance by the amount of bytes read. If
   // reading caused backward_bytes() to exceed backward_capacity(), an eviction
   // of the backward buffer will be done internally.
   size_t Read(uint8* data, size_t size);
 
   // Copies up to |size| bytes from current position to |data|. Returns
   // number of bytes copied. Doesn't advance current position.
   size_t Peek(uint8* data, size_t size);
 
+  // Returns pointer to the current chunk of data that is being consumed.
+  // If there is no data left in the buffer false is returned, otherwise
+  // true is returned and |data| and |size| are updated. The returned
+  // |data| value becomes invalid when Read(), Append() or Seek()
+  // are called.
+  bool GetCurrentChunk(const uint8** data, size_t* size) const;
+
   // Appends |buffer_in| to this buffer. Returns false if forward_bytes() is
   // greater than or equals to forward_capacity(), true otherwise. The data
   // is added to the buffer in any case.
   bool Append(Buffer* buffer_in);
 
   // Appends |size| bytes of |data| to the buffer. Result is the same
   // as for Append(Buffer*).
   bool Append(const uint8* data, size_t size);
 
   // Moves the read position by |offset| bytes. If |offset| is positive, the
@@ skipping 78 matching lines @@
   // Keeps track of the most recent time we've seen in case the |buffers_| is
   // empty when our owner asks what time it is.
   base::TimeDelta current_time_;
 
   DISALLOW_COPY_AND_ASSIGN(SeekableBuffer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_SEEKABLE_BUFFER_H_