Refactor AudioRendererBase to use scoped_refptr<AudioDecoder>

media/filters/audio_renderer_base.cc

 // 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.
 
 #include "media/base/filter_host.h"
 #include "media/filters/audio_renderer_base.h"
 
 namespace media {
 
 // The maximum size of the queue, which also acts as the number of initial reads
 // to perform for buffering.  The size of the queue should never exceed this
 // number since we read only after we've dequeued and released a buffer in
 // callback thread.
 //
 // This is sort of a magic number, but for 44.1kHz stereo audio this will give
 // us enough data to fill approximately 4 complete callback buffers.
 const size_t AudioRendererBase::kDefaultMaxQueueSize = 16;
 
 AudioRendererBase::AudioRendererBase(size_t max_queue_size)
-    : decoder_(NULL),
-      max_queue_size_(max_queue_size),
+    : max_queue_size_(max_queue_size),
       data_offset_(0),
       initialized_(false),
       stopped_(false) {
 }
 
 AudioRendererBase::~AudioRendererBase() {
   // Stop() should have been called and OnReadComplete() should have stopped
   // enqueuing data.
   DCHECK(stopped_);
   DCHECK(queue_.empty());
@@ skipping 197 matching lines @@
   // TODO(scherkus): might be handy to support NULL parameters.
   std::string mime_type;
   return media_format.GetAsString(MediaFormat::kMimeType, &mime_type) &&
       media_format.GetAsInteger(MediaFormat::kChannels, channels_out) &&
       media_format.GetAsInteger(MediaFormat::kSampleRate, sample_rate_out) &&
       media_format.GetAsInteger(MediaFormat::kSampleBits, sample_bits_out) &&
       mime_type.compare(mime_type::kUncompressedAudio) == 0;
 }
 
 }  // namespace media