Guard against midstream audio configuration changes.

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 25 matching lines @@
   // 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;
-  int sample_rate() const;
+  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;
 
  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_