modules/rtp_rtcp/source/fec_test_helper.h

/*
 *  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 "modules/interface/module_common_types.h"
#include "modules/rtp_rtcp/source/forward_error_correction.h"

namespace webrtc {

enum { kRtpHeaderSize = 12 };
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,
                    int 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_