Always round up to the next full frame when sizing WebAudio decodes.

media/filters/audio_file_reader.h

 // Copyright (c) 2011 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_FILTERS_AUDIO_FILE_READER_H_
 #define MEDIA_FILTERS_AUDIO_FILE_READER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
@@ skipping 10 matching lines @@
 
 class MEDIA_EXPORT AudioFileReader {
  public:
   // Audio file data will be read using the given protocol.
   // The AudioFileReader does not take ownership of |protocol| and
   // simply maintains a weak reference to it.
   explicit AudioFileReader(FFmpegURLProtocol* protocol);
   virtual ~AudioFileReader();
 
   // Open() reads the audio data format so that the sample_rate(),
-  // channels(), duration(), and number_of_frames() methods can be called.
+  // channels(), GetDuration(), and GetNumberOfFrames() methods can be called.
   // It returns |true| on success.
   bool Open();
   void Close();
 
   // After a call to Open(), attempts to fully fill |audio_bus| with decoded
   // audio data.  Any unfilled frames will be zeroed out.
   // |audio_data| must be of the same size as channels().
   // The audio data will be decoded as floating-point linear PCM with
   // a nominal range of -1.0 -> +1.0.
   // Returns the number of sample-frames actually read which will always be
   // <= audio_bus->frames()
   int Read(AudioBus* audio_bus);
 
   // These methods can be called once Open() has been called.
   int channels() const { return channels_; }
   int sample_rate() const { return sample_rate_; }
 
-  // Please note that duration() and number_of_frames() attempt to be accurate,
-  // but are only estimates.  For some encoded formats, the actual duration
-  // of the file can only be determined once all the file data has been read.
-  // The Read() method returns the actual number of sample-frames it has read.
-  base::TimeDelta duration() const;
-  int64 number_of_frames() const;
+  // Please note that GetDuration() and GetNumberOfFrames() attempt to be
+  // accurate, but are only estimates.  For some encoded formats, the actual
+  // duration of the file can only be determined once all the file data has been
+  // read. The Read() method returns the actual number of sample-frames it has
+  // read.
+  base::TimeDelta GetDuration() const;
+  int GetNumberOfFrames() const;
 
  private:
   scoped_ptr<FFmpegGlue> glue_;
   AVCodecContext* codec_context_;
   int stream_index_;
   FFmpegURLProtocol* protocol_;
   int channels_;
   int sample_rate_;
 
   // AVSampleFormat initially requested; not Chrome's SampleFormat.
   int av_sample_format_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioFileReader);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_AUDIO_FILE_READER_H_