text: // 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.
  
  // Handles NACK list and manages ACK.
  
  #ifndef MEDIA_CAST_FRAMER_CAST_MESSAGE_BUILDER_H_
  #define MEDIA_CAST_FRAMER_CAST_MESSAGE_BUILDER_H_
  
  #include <map>
  
  #include "media/cast/framer/frame_id_map.h"
  #include "media/cast/rtcp/rtcp.h"
  #include "media/cast/rtp_receiver/rtp_receiver_defines.h"
  
  namespace media {
  namespace cast {
  
  class RtpPayloadFeedback;
  
  typedef std::map<uint32, base::TimeTicks> TimeLastNackMap;
  
  class CastMessageBuilder {
   public:
    CastMessageBuilder(base::TickClock* clock,
                       RtpPayloadFeedback* incoming_payload_feedback,
                       FrameIdMap* frame_id_map,
                       uint32 media_ssrc,
                       bool decoder_faster_than_max_frame_rate,
                       int max_unacked_frames);
    ~CastMessageBuilder();
  
    void CompleteFrameReceived(uint32 frame_id, bool is_key_frame);
    bool TimeToSendNextCastMessage(base::TimeTicks* time_to_send);
    void UpdateCastMessage();
    void Reset();
  
   private:
    bool UpdateAckMessage();
    void BuildPacketList();
    bool UpdateCastMessageInternal(RtcpCastMessage* message);
  
    base::TickClock* const clock_;  // Not owned by this class.
    RtpPayloadFeedback* const cast_feedback_;
  
    // CastMessageBuilder has only const access to the frame id mapper.
    const FrameIdMap* const frame_id_map_;
    const uint32 media_ssrc_;
    const bool decoder_faster_than_max_frame_rate_;
    const int max_unacked_frames_;
  
    RtcpCastMessage cast_msg_;
    base::TimeTicks last_update_time_;
    bool waiting_for_key_frame_;
  
    TimeLastNackMap time_last_nacked_map_;
  
    bool slowing_down_ack_;
    bool acked_last_frame_;
    uint32 last_acked_frame_id_;
  
    DISALLOW_COPY_AND_ASSIGN(CastMessageBuilder);
  };
  
  }  // namespace cast
  }  // namespace media
  
  #endif  //  MEDIA_CAST_FRAMER_CAST_MESSAGE_BUILDER_H_
  