Add AudioBufferStream.

media/filters/decrypting_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_DECRYPTING_AUDIO_DECODER_H_
 #define MEDIA_FILTERS_DECRYPTING_AUDIO_DECODER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 25 matching lines @@
   // format designated by kSupportedBitsPerChannel.
   // TODO(xhwang): Remove this restriction after http://crbug.com/169105 fixed.
   static const int kSupportedBitsPerChannel;
 
   DecryptingAudioDecoder(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
       const SetDecryptorReadyCB& set_decryptor_ready_cb);
   virtual ~DecryptingAudioDecoder();
 
   // AudioDecoder implementation.
-  virtual void Initialize(DemuxerStream* stream,
-                          const PipelineStatusCB& status_cb,
-                          const StatisticsCB& statistics_cb) OVERRIDE;
-  virtual void Read(const ReadCB& read_cb) OVERRIDE;
+  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 scoped_refptr<AudioBuffer> GetDecodeOutput() OVERRIDE;
   virtual void Reset(const base::Closure& closure) OVERRIDE;
   virtual void Stop(const base::Closure& closure) OVERRIDE;
   virtual int bits_per_channel() OVERRIDE;
   virtual ChannelLayout channel_layout() OVERRIDE;
   virtual int samples_per_second() OVERRIDE;
 
  private:
   // For a detailed state diagram please see this link: http://goo.gl/8jAok
   // TODO(xhwang): Add a ASCII state diagram in this file after this class
   // stabilizes.
   // TODO(xhwang): Update this diagram for DecryptingAudioDecoder.
   enum State {
     kUninitialized = 0,
     kDecryptorRequested,
     kPendingDecoderInit,
     kIdle,
-    kPendingConfigChange,
-    kPendingDemuxerRead,
     kPendingDecode,
     kWaitingForKey,
     kDecodeFinished,
     kStopped,
   };
 
   // Callback for DecryptorHost::RequestDecryptor().
   void SetDecryptor(Decryptor* decryptor);
 
   // Callback for Decryptor::InitializeAudioDecoder() during initialization.
   void FinishInitialization(bool success);
 
-  // Callback for Decryptor::InitializeAudioDecoder() during config change.
-  void FinishConfigChange(bool success);
-
-  // Reads from the demuxer stream with corresponding callback method.
-  void ReadFromDemuxerStream();
-  void DecryptAndDecodeBuffer(DemuxerStream::Status status,
-                              const scoped_refptr<DecoderBuffer>& buffer);
-
   void DecodePendingBuffer();
 
   // Callback for Decryptor::DecryptAndDecodeAudio().
   void DeliverFrame(int buffer_size,
                     Decryptor::Status status,
                     const Decryptor::AudioBuffers& frames);
 
   // Callback for the |decryptor_| to notify this object that a new key has been
   // added.
   void OnKeyAdded();
 
   // Resets decoder and calls |reset_cb_|.
   void DoReset();
 
   // Updates audio configs from |demuxer_stream_| and resets
   // |output_timestamp_base_| and |total_samples_decoded_|.
   void UpdateDecoderConfig();
 
   // Sets timestamp and duration for |queued_audio_frames_| to make sure the
   // renderer always receives continuous frames without gaps and overlaps.
   void EnqueueFrames(const Decryptor::AudioBuffers& frames);
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   base::WeakPtrFactory<DecryptingAudioDecoder> weak_factory_;
   base::WeakPtr<DecryptingAudioDecoder> weak_this_;
 
   State state_;
 
   PipelineStatusCB init_cb_;
-  StatisticsCB statistics_cb_;
-  ReadCB read_cb_;
+  DecodeCB decode_cb_;
   base::Closure reset_cb_;
   base::Closure stop_cb_;
 
-  // Pointer to the demuxer stream that will feed us compressed buffers.
-  DemuxerStream* demuxer_stream_;
+  // The current decoder configuration.
+  AudioDecoderConfig config_;
 
   // Callback to request/cancel decryptor creation notification.
   SetDecryptorReadyCB set_decryptor_ready_cb_;
 
   Decryptor* decryptor_;
 
-  // The buffer returned by the demuxer that needs decrypting/decoding.
+  // The buffer that needs decrypting/decoding.
   scoped_refptr<media::DecoderBuffer> pending_buffer_to_decode_;
 
   // Indicates the situation where new key is added during pending decode
   // (in other words, this variable can only be set in state kPendingDecode).
   // If this variable is true and kNoKey is returned then we need to try
   // decrypting/decoding again in case the newly added key is the correct
   // decryption key.
   bool key_added_while_decode_pending_;
 
   Decryptor::AudioBuffers queued_audio_frames_;
 
   // Decoded audio format.
   int bits_per_channel_;
   ChannelLayout channel_layout_;
   int samples_per_second_;
 
   scoped_ptr<AudioTimestampHelper> timestamp_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(DecryptingAudioDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_DECRYPTING_AUDIO_DECODER_H_