Speech refactoring: Turned AudioChunk into a refcounted class (CL1.4)

content/browser/speech/audio_encoder.h

 // 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.
 
 #ifndef CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_
 #define CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_
 
 #include <list>
 #include <string>
 
 #include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
+#include "base/memory/ref_counted.h"
 #include "content/browser/speech/audio_buffer.h"
 
 namespace speech {
 class AudioChunk;
 // Provides a simple interface to encode raw audio using the various speech
 // codecs.
 class AudioEncoder {
  public:
   enum Codec {
     CODEC_FLAC,
     CODEC_SPEEX,
   };
 
   static AudioEncoder* Create(Codec codec,
                               int sampling_rate,
                               int bits_per_sample);
 
   virtual ~AudioEncoder();
 
   // Encodes |raw audio| to the internal buffer. Use
   // |GetEncodedDataAndClear| to read the result after this call or when
   // audio capture completes.
   virtual void Encode(const AudioChunk& raw_audio) = 0;
 
   // Finish encoding and flush any pending encoded bits out.
   virtual void Flush() = 0;
 
   // Merges, retrieves and clears all the accumulated encoded audio chunks.
-  scoped_ptr<AudioChunk> GetEncodedDataAndClear();
+  scoped_refptr<AudioChunk> GetEncodedDataAndClear();
 
   const std::string& mime_type() { return mime_type_; }
   int bits_per_sample() { return bits_per_sample_; }
 
  protected:
   AudioEncoder(const std::string& mime_type, int bits_per_sample);
   AudioBuffer encoded_audio_buffer_;
 
  private:
   std::string mime_type_;
   int bits_per_sample_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioEncoder);
 };
 
 }  // namespace speech
 
 #endif  // CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_