media/cast/net/rtp/cast_message_builder.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Handles NACK list and manages ACK.
   6
   7 #ifndef MEDIA_CAST_FRAMER_CAST_MESSAGE_BUILDER_H_
   8 #define MEDIA_CAST_FRAMER_CAST_MESSAGE_BUILDER_H_
   9
  10 #include <deque>
  11 #include <map>
  12
  13 #include "media/cast/net/rtcp/rtcp.h"
  14 #include "media/cast/net/rtp/rtp_receiver_defines.h"
  15
  16 namespace media {
  17 namespace cast {
  18
  19 class Framer;
  20 class RtpPayloadFeedback;
  21
  22 typedef std::map<uint32, base::TimeTicks> TimeLastNackMap;
  23
  24 class CastMessageBuilder {
  25  public:
  26   CastMessageBuilder(base::TickClock* clock,
  27                      RtpPayloadFeedback* incoming_payload_feedback,
  28                      const Framer* framer,
  29                      uint32 media_ssrc,
  30                      bool decoder_faster_than_max_frame_rate,
  31                      int max_unacked_frames);
  32   ~CastMessageBuilder();
  33
  34   void CompleteFrameReceived(uint32 frame_id);
  35   bool TimeToSendNextCastMessage(base::TimeTicks* time_to_send);
  36   void UpdateCastMessage();
  37   void Reset();
  38
  39  private:
  40   bool UpdateAckMessage(uint32 frame_id);
  41   void BuildPacketList();
  42   bool UpdateCastMessageInternal(RtcpCastMessage* message);
  43
  44   base::TickClock* const clock_;  // Not owned by this class.
  45   RtpPayloadFeedback* const cast_feedback_;
  46
  47   // CastMessageBuilder has only const access to the framer.
  48   const Framer* const framer_;
  49   const uint32 media_ssrc_;
  50   const bool decoder_faster_than_max_frame_rate_;
  51   const int max_unacked_frames_;
  52
  53   RtcpCastMessage cast_msg_;
  54   base::TimeTicks last_update_time_;
  55
  56   TimeLastNackMap time_last_nacked_map_;
  57
  58   bool slowing_down_ack_;
  59   bool acked_last_frame_;
  60   uint32 last_acked_frame_id_;
  61   std::deque<uint32> ack_queue_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(CastMessageBuilder);
  64 };
  65
  66 }  // namespace cast
  67 }  // namespace media
  68
  69 #endif  //  MEDIA_CAST_FRAMER_CAST_MESSAGE_BUILDER_H_