Add Cast PLI support on sender side.

media/cast/net/rtcp/rtcp_defines.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_NET_RTCP_RTCP_DEFINES_H_
 #define MEDIA_CAST_NET_RTCP_RTCP_DEFINES_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 33 matching lines @@
 
 // Handle the per frame ACK and NACK messages.
 struct RtcpCastMessage {
   explicit RtcpCastMessage(uint32_t ssrc);
   RtcpCastMessage();
   ~RtcpCastMessage();
 
   uint32_t media_ssrc;
   uint32_t ack_frame_id;
   uint16_t target_delay_ms;
+  bool picture_loss_indicator;

[miu, 2016/02/26 23:36:06]

This isn't part of the Cast Feedback message.  I'd suggest removing this and
instead and adding some simple plumbing in the receiver code (see comment in
receiver_rtcp_session.cc).

[xjz, 2016/02/27 05:53:32]

Done.

   MissingFramesAndPacketsMap missing_frames_and_packets;
 };
 
 // Log messages from receiver to sender.
 struct RtcpReceiverEventLogMessage {
   RtcpReceiverEventLogMessage();
   ~RtcpReceiverEventLogMessage();
 
   CastLoggingEvent type;
   base::TimeTicks event_timestamp;
@@ skipping 45 matching lines @@
   base::TimeDelta delay_delta;
 
   // Only set for packet events.
   uint16_t packet_id;
 };
 
 typedef base::Callback<void(const RtcpCastMessage&)> RtcpCastMessageCallback;
 typedef base::Callback<void(base::TimeDelta)> RtcpRttCallback;
 typedef
 base::Callback<void(const RtcpReceiverLogMessage&)> RtcpLogMessageCallback;
+typedef base::Callback<void()> RtcpPliCallback;
 
 // TODO(hubbe): Document members of this struct.
 struct RtpReceiverStatistics {
   RtpReceiverStatistics();
   uint8_t fraction_lost;
   uint32_t cumulative_lost;  // 24 bits valid.
   uint32_t extended_high_sequence_number;
   uint32_t jitter;
 };
 
@@ skipping 16 matching lines @@
   base::TimeDelta target_delay;
   scoped_ptr<std::vector<std::pair<RtpTimeTicks, RtcpEvent>>> rtcp_events;
   scoped_ptr<RtpReceiverStatistics> rtp_receiver_statistics;
 };
 
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_NET_RTCP_RTCP_DEFINES_H_