[Cast] Limit frames in flight by duration, and not by number of frames.

media/cast/sender/audio_sender.h

 // Copyright 2014 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_CAST_SENDER_AUDIO_SENDER_H_
 #define MEDIA_CAST_SENDER_AUDIO_SENDER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 34 matching lines @@
   // sent, if AudioSender detects too many frames in flight.  Therefore, clients
   // should be careful about the rate at which this method is called.
   //
   // Note: It is invalid to call this method if InitializationResult() returns
   // anything but STATUS_AUDIO_INITIALIZED.
   void InsertAudio(scoped_ptr<AudioBus> audio_bus,
                    const base::TimeTicks& recorded_time);
 
  protected:
   virtual int GetNumberOfFramesInEncoder() const OVERRIDE;
+  virtual base::TimeDelta GetInFlightMediaDuration() const OVERRIDE;
   virtual void OnAck(uint32 frame_id) OVERRIDE;
 
  private:
   // Called by the |audio_encoder_| with the next EncodedFrame to send.
   void OnEncodedAudioFrame(int encoder_bitrate,
                            scoped_ptr<EncodedFrame> encoded_frame,
                            int samples_skipped);
 
   // Encodes AudioBuses into EncodedFrames.
   scoped_ptr<AudioEncoder> audio_encoder_;
 
   // The number of audio samples enqueued in |audio_encoder_|.
   int samples_in_encoder_;
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<AudioSender> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioSender);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_SENDER_AUDIO_SENDER_H_