Lots of files touched for a very simple change. Everywhere we used a const M...

media/filters/audio_renderer_base.h

 // Copyright (c) 2009 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.
 
 // AudioRendererBase takes care of the tricky queuing work and provides simple
 // methods for subclasses to peek and poke at audio data.  In addition to
 // AudioRenderer interface methods this classes doesn't implement, subclasses
 // must also implement the following methods:
 //   OnInitialized
 //   OnStop
@@ skipping 25 matching lines @@
   virtual bool Initialize(AudioDecoder* decoder);
 
   // AssignableBuffer<AudioRendererBase, BufferInterface> implementation.
   virtual void OnAssignment(Buffer* buffer_in);
 
  protected:
   // The default maximum size of the queue.
   static const size_t kDefaultMaxQueueSize;
 
   // Only allow a factory to create this class.
-  AudioRendererBase(size_t max_queue_size);
+  explicit AudioRendererBase(size_t max_queue_size);
   virtual ~AudioRendererBase();
 
   // Called by Initialize().  |media_format| is the format of the AudioDecoder.
   // Subclasses should return true if they were able to initialize, false
   // otherwise.
-  virtual bool OnInitialize(const MediaFormat* media_format) = 0;
+  virtual bool OnInitialize(const MediaFormat& media_format) = 0;
 
   // Called by Stop().  Subclasses should perform any necessary cleanup during
   // this time, such as stopping any running threads.
   virtual void OnStop() = 0;
 
   // Fills the given buffer with audio data by dequeuing buffers and copying the
   // data into the |dest|.  FillBuffer also takes care of updating the clock.
   // Returns the number of bytes copied into |dest|, which may be less than
   // equal to |len|.
   //
   // If this method is returns less bytes than |len| (including zero), it could
   // be a sign that the pipeline is stalled or unable to stream the data fast
   // enough.  In such scenarios, the callee should zero out unused portions
   // of their buffer to playback silence.
   //
   // Safe to call on any thread.
   size_t FillBuffer(uint8* dest, size_t len);
 
   // Helper to parse a media format and return whether we were successful
   // retrieving all the information we care about.
-  static bool ParseMediaFormat(const MediaFormat* media_format,
+  static bool ParseMediaFormat(const MediaFormat& media_format,
                                int* channels_out, int* sample_rate_out,
                                int* sample_bits_out);
 
  private:
   // Audio decoder.
   AudioDecoder* decoder_;
 
   // Maximum queue size, configuration parameter passed in during construction.
   size_t max_queue_size_;
 
@@ skipping 16 matching lines @@
   //
   // Safe to call on any thread.
   void ScheduleRead();
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererBase);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_