Introduce AudioDiscardHelper. Refactor audio decoders to use it.

media/base/audio_buffer.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_BASE_AUDIO_BUFFER_H_
 #define MEDIA_BASE_AUDIO_BUFFER_H_
 
 #include <vector>
 
 #include "base/memory/aligned_memory.h"
@@ skipping 81 matching lines @@
 
   // Return the number of frames held.
   int frame_count() const { return adjusted_frame_count_; }
 
   // Return the sample rate.
   int sample_rate() const { return sample_rate_; }
 
   // Return the channel layout.
   ChannelLayout channel_layout() const { return channel_layout_; }
 
-  // Access to constructor parameters.
   base::TimeDelta timestamp() const { return timestamp_; }
   base::TimeDelta duration() const { return duration_; }
-
-  // TODO(jrummell): Remove set_timestamp() and set_duration() once
-  // DecryptingAudioDecoder::EnqueueFrames() is changed to set them when
-  // creating the buffer. See http://crbug.com/255261.
   void set_timestamp(base::TimeDelta timestamp) { timestamp_ = timestamp; }
   void set_duration(base::TimeDelta duration) { duration_ = duration; }
 
   // If there's no data in this buffer, it represents end of stream.
   bool end_of_stream() const { return end_of_stream_; }
 
   // Access to the raw buffer for ffmpeg to write directly to. Data for planar
   // data is grouped by channel. There is only 1 entry for interleaved formats.
   const std::vector<uint8*>& channel_data() const { return channel_data_; }
 
@@ skipping 32 matching lines @@
 
   // For planar data, points to each channels data.
   std::vector<uint8*> channel_data_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AudioBuffer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_BUFFER_H_