text: // 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.
  
  // A very simple packet builder class for building RTCP packets.
  // Used for testing only.
  #ifndef MEDIA_CAST_NET_RTCP_TEST_RTCP_PACKET_BUILDER_H_
  #define MEDIA_CAST_NET_RTCP_TEST_RTCP_PACKET_BUILDER_H_
  
  #include <stdint.h>
  #include <vector>
  
  #include "base/big_endian.h"
  #include "media/cast/net/cast_transport_defines.h"
  #include "media/cast/net/rtcp/rtcp_defines.h"
  
  namespace media {
  namespace cast {
  
  // These values are arbitrary only for the purpose of testing.
  
  namespace {
  // Sender report.
  static const uint32_t kNtpHigh = 0x01020304;
  static const uint32_t kNtpLow = 0x05060708;
  static const uint32_t kRtpTimestamp = 0x10203040;
  static const uint32_t kSendPacketCount = 987;
  static const uint32_t kSendOctetCount = 87654;
  
  // Report block.
  static const int kLoss = 0x01000123;
  static const int kExtendedMax = 0x15678;
  static const int kTestJitter = 0x10203;
  static const uint32_t kLastSr = 0x34561234;
  static const uint32_t kDelayLastSr = 1000;
  
  // DLRR block.
  static const int kLastRr = 0x34561234;
  static const int kDelayLastRr = 1000;
  
  // NACK.
  static const int kMissingPacket = 34567;
  
  // CAST.
  static const uint32_t kAckFrameId = 17;
  static const uint32_t kLostFrameId = 18;
  static const uint32_t kFrameIdWithLostPackets = 19;
  static const int kLostPacketId1 = 3;
  static const int kLostPacketId2 = 5;
  static const int kLostPacketId3 = 12;
  static const uint8_t kFeedbackSeq = 1;
  }  // namespace
  
  class TestRtcpPacketBuilder {
   public:
    TestRtcpPacketBuilder();
  
    TestRtcpPacketBuilder(const TestRtcpPacketBuilder&) = delete;
    TestRtcpPacketBuilder& operator=(const TestRtcpPacketBuilder&) = delete;
  
    void AddSr(uint32_t remote_ssrc, int number_of_report_blocks);
    void AddSrWithNtp(uint32_t remote_ssrc,
                      uint32_t ntp_high,
                      uint32_t ntp_low,
                      uint32_t rtp_timestamp);
    void AddRr(uint32_t remote_ssrc, int number_of_report_blocks);
    void AddRb(uint32_t rtp_ssrc);
  
    void AddXrHeader(uint32_t remote_ssrc);
    void AddXrDlrrBlock(uint32_t remote_ssrc);
    void AddXrExtendedDlrrBlock(uint32_t remote_ssrc);
    void AddXrRrtrBlock();
    void AddXrUnknownBlock();
    void AddUnknownBlock();
  
    void AddNack(uint32_t remote_ssrc, uint32_t local_ssrc);
    void AddSendReportRequest(uint32_t remote_ssrc, uint32_t local_ssrc);
  
    void AddCast(uint32_t remote_ssrc,
                 uint32_t local_ssrc,
                 base::TimeDelta target_delay);
    void AddCst2(const std::vector<FrameId>& later_received_frames);
    void AddErrorCst2();  // With wrong identifier.
    void AddPli(uint32_t remote_ssrc, uint32_t local_ssrc);
  
    void AddReceiverLog(uint32_t remote_ssrc);
    void AddReceiverFrameLog(uint32_t rtp_timestamp,
                             int num_events,
                             uint32_t event_timesamp_base);
    void AddReceiverEventLog(uint16_t event_data,
                             CastLoggingEvent event,
                             uint16_t event_timesamp_delta);
  
    std::unique_ptr<Packet> GetPacket();
    const uint8_t* Data();
    int Length() { return kMaxIpPacketSize - big_endian_writer_.remaining(); }
    base::BigEndianReader* Reader();
  
   private:
    void AddRtcpHeader(int payload, int format_or_count);
    void PatchLengthField();
  
    // Where the length field of the current packet is.
    // Note: 0 is not a legal value, it is used for "uninitialized".
    uint8_t buffer_[kMaxIpPacketSize];
    char* ptr_of_length_;
    base::BigEndianWriter big_endian_writer_;
    base::BigEndianReader big_endian_reader_;
  };
  
  }  // namespace cast
  }  // namespace media
  
  #endif  // MEDIA_CAST_NET_RTCP_TEST_RTCP_PACKET_BUILDER_H_
  