Add support for midstream audio configuration changes.

media/filters/opus_audio_decoder.h

 // Copyright (c) 2012 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_OPUS_AUDIO_DECODER_H_
 #define MEDIA_FILTERS_OPUS_AUDIO_DECODER_H_
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
@@ skipping 18 matching lines @@
  public:
   explicit OpusAudioDecoder(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
   virtual ~OpusAudioDecoder();
 
   // AudioDecoder implementation.
   virtual void Initialize(const AudioDecoderConfig& config,
                           const PipelineStatusCB& status_cb) OVERRIDE;
   virtual void Decode(const scoped_refptr<DecoderBuffer>& buffer,
                       const DecodeCB& decode_cb) OVERRIDE;
-  virtual int bits_per_channel() OVERRIDE;
-  virtual ChannelLayout channel_layout() OVERRIDE;
-  virtual int samples_per_second() OVERRIDE;
   virtual void Reset(const base::Closure& closure) OVERRIDE;
   virtual void Stop(const base::Closure& closure) OVERRIDE;
 
  private:
   void DoReset();
   void DoStop();
 
   // Reads from the demuxer stream with corresponding callback method.
   void ReadFromDemuxerStream();
   void DecodeBuffer(const scoped_refptr<DecoderBuffer>& input,
                     const DecodeCB& decode_cb);
 
   bool ConfigureDecoder();
   void CloseDecoder();
   void ResetTimestampState();
   bool Decode(const scoped_refptr<DecoderBuffer>& input,
               scoped_refptr<AudioBuffer>* output_buffer);
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   base::WeakPtrFactory<OpusAudioDecoder> weak_factory_;
   base::WeakPtr<OpusAudioDecoder> weak_this_;
 
   AudioDecoderConfig config_;
   OpusMSDecoder* opus_decoder_;
 
-  // Decoded audio format.
-  ChannelLayout channel_layout_;
-  int samples_per_second_;
-  const SampleFormat sample_format_;
-  const int bits_per_channel_;
-
   // Used for computing output timestamps.
   scoped_ptr<AudioTimestampHelper> output_timestamp_helper_;
   base::TimeDelta last_input_timestamp_;
 
   // Number of frames to be discarded from the start of the packet. This value
   // is respected for all packets except for the first one in the stream. For
   // the first packet in the stream, |frame_delay_at_start_| is used. This is
   // usually set to the SeekPreRoll value from the container whenever a seek
   // happens.
   int frames_to_discard_;
 
   // Number of frames to be discarded at the start of the stream. This value
   // is typically the CodecDelay value from the container.  This value should
   // only be applied when input timestamp is |start_input_timestamp_|.
   int frame_delay_at_start_;
   base::TimeDelta start_input_timestamp_;
 
   // Timestamp to be subtracted from all the frames. This is typically computed
   // from the CodecDelay value in the container.
   base::TimeDelta timestamp_offset_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(OpusAudioDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_OPUS_AUDIO_DECODER_H_