text: /*
   *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_FEC_TEST_HELPER_H_
  #define WEBRTC_MODULES_RTP_RTCP_SOURCE_FEC_TEST_HELPER_H_
  
  #include "../module_common_types.h"
  #include "forward_error_correction.h"
  
  namespace webrtc {
  
  enum {
    kFecPayloadType = 96
  };
  enum {
    kRedPayloadType = 97
  };
  enum {
    kVp8PayloadType = 120
  };
  
  typedef ForwardErrorCorrection::Packet Packet;
  
  struct RtpPacket : public Packet {
    WebRtcRTPHeader header;
  };
  
  class FrameGenerator {
   public:
    FrameGenerator();
  
    void NewFrame(int num_packets);
  
    uint16_t NextSeqNum();
  
    RtpPacket* NextPacket(int offset, size_t length);
  
    // Creates a new RtpPacket with the RED header added to the packet.
    RtpPacket* BuildMediaRedPacket(const RtpPacket* packet);
  
    // Creates a new RtpPacket with FEC payload and red header. Does this by
    // creating a new fake media RtpPacket, clears the marker bit and adds a RED
    // header. Finally replaces the payload with the content of |packet->data|.
    RtpPacket* BuildFecRedPacket(const Packet* packet);
  
    void SetRedHeader(Packet* red_packet, uint8_t payload_type,
                      size_t header_length) const;
  
   private:
    static void BuildRtpHeader(uint8_t* data, const RTPHeader* header);
  
    int num_packets_;
    uint16_t seq_num_;
    uint32_t timestamp_;
  };
  }
  
  #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_FEC_TEST_HELPER_H_
  