cast: Support for low-latency interactive mode

media/cast/sender/video_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_VIDEO_SENDER_H_
 #define MEDIA_CAST_SENDER_VIDEO_SENDER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 80 matching lines @@
   // The timestamp of the frame that was last enqueued in |video_encoder_|.
   RtpTimestamp last_enqueued_frame_rtp_timestamp_;
   base::TimeTicks last_enqueued_frame_reference_time_;
 
   // Remember what we set the bitrate to before, no need to set it again if
   // we get the same value.
   int last_bitrate_;
 
   PlayoutDelayChangeCB playout_delay_change_cb_;
 
+  // Indicates we are operating in a mode where the target playout latency is
+  // low for best user experience. When operating in low latency mode, we
+  // prefer dropping frames over increasing target playout time.
+  bool low_latency_mode_;
+
   // The video encoder's performance metrics as of the last call to
   // OnEncodedVideoFrame().  See header file comments for SenderEncodedFrame for
   // an explanation of these values.
   double last_reported_deadline_utilization_;
   double last_reported_lossy_utilization_;
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<VideoSender> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoSender);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_SENDER_VIDEO_SENDER_H_