Cast:Adding signaling and infrastructure for adjustable delay

media/cast/video_receiver/video_receiver.h

 // Copyright 2013 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_VIDEO_RECEIVER_VIDEO_RECEIVER_H_
 #define MEDIA_CAST_VIDEO_RECEIVER_VIDEO_RECEIVER_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
@@ skipping 15 matching lines @@
 namespace cast {
 
 class Framer;
 class LocalRtpVideoData;
 class LocalRtpVideoFeedback;
 class PeerVideoReceiver;
 class Rtcp;
 class RtpReceiverStatistics;
 class VideoDecoder;
 
+// Callback used by the video receiver to inform the audio receiver of the new
+// delay used to compute the playout and render times.
+typedef base::Callback<void(base::TimeDelta)> SetTargetDelayCallback;
+
 // Should only be called from the Main cast thread.
 class VideoReceiver : public base::NonThreadSafe,
                       public base::SupportsWeakPtr<VideoReceiver> {
  public:
   VideoReceiver(scoped_refptr<CastEnvironment> cast_environment,
                 const VideoReceiverConfig& video_config,
-                transport::PacedPacketSender* const packet_sender);
+                transport::PacedPacketSender* const packet_sender,
+                const SetTargetDelayCallback& target_delay_cb);
 
   virtual ~VideoReceiver();
 
   // Request a raw frame. Will return frame via callback when available.
   void GetRawVideoFrame(const VideoFrameDecodedCallback& callback);
 
   // Request an encoded frame. Will return frame via callback when available.
   void GetEncodedVideoFrame(const VideoFrameEncodedCallback& callback);
 
   // Insert a RTP packet to the video receiver.
@@ skipping 38 matching lines @@
 
   // Schedule timing for the next RTCP report.
   void ScheduleNextRtcpReport();
 
   // Actually send the next cast message.
   void SendNextCastMessage();
 
   // Actually send the next RTCP report.
   void SendNextRtcpReport();
 
+  // Update the target delay based on past information. Will also update the
+  // rtcp module and the audio receiver.
+  void UpdateTargetDelay();
+
   scoped_ptr<VideoDecoder> video_decoder_;
   scoped_refptr<CastEnvironment> cast_environment_;
 
   // Subscribes to raw events.
   // Processes raw audio events to be sent over to the cast sender via RTCP.
   ReceiverRtcpEventSubscriber event_subscriber_;
 
   scoped_ptr<Framer> framer_;
   const transport::VideoCodec codec_;
   base::TimeDelta target_delay_delta_;
   base::TimeDelta frame_delay_;
   scoped_ptr<LocalRtpVideoData> incoming_payload_callback_;
   scoped_ptr<LocalRtpVideoFeedback> incoming_payload_feedback_;
   RtpReceiver rtp_receiver_;
   scoped_ptr<Rtcp> rtcp_;
   scoped_ptr<RtpReceiverStatistics> rtp_video_receiver_statistics_;
   base::TimeDelta time_offset_;  // Sender-receiver offset estimation.
   int time_offset_counter_;
   transport::TransportEncryptionHandler decryptor_;
   std::list<VideoFrameEncodedCallback> queued_encoded_callbacks_;
   bool time_incoming_packet_updated_;
   base::TimeTicks time_incoming_packet_;
   uint32 incoming_rtp_timestamp_;
   base::TimeTicks last_render_time_;
+  SetTargetDelayCallback target_delay_cb_;
 
   // This mapping allows us to log kVideoAckSent as a frame event. In addition
   // it allows the event to be transmitted via RTCP.
   RtpTimestamp frame_id_to_rtp_timestamp_[256];
 
   base::WeakPtrFactory<VideoReceiver> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoReceiver);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_VIDEO_RECEIVER_VIDEO_RECEIVER_H_